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35results about How to "Reduced risk of irreversible demagnetization" patented technology
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Application method of mixed permanent magnets in flux-switching permanent magnet motor
InactiveCN104242501ASignificant progressHighlight substantiveMagnetic circuit stationary partsMagnetic circuit characterised by magnetic materialsRare earthPermanent magnet motor
Owner:HEBEI UNIV OF TECH
Rotor of built-in permanent magnet motor and magnetic steel structural parameter determining method thereof
InactiveCN102157998AHigh mechanical strengthIncrease stiffnessMagnetic circuit rotating partsElectric machinePermanent magnet motor
The invention relates to a rotor of a high-quality and high-speed built-in permanent magnet motor and a magnetic steel structural parameter determining method thereof. In the invention, the whole section magnetic steel of each electrode of the rotor of a conventional built-in permanent magnet motor is divided into multiple sections of magnetic steel which have the same polarity and different widths; the multiple sections of the magnetic steel are respectively arranged in a rotor core; and reinforcing ribs with the function of magnetic isolation are arranged among the multiple sections of the magnetic steel. By reasonably modulating and determining the width and distribution of each section of the magnetic steel, the air gap magnetic density waveform approaches sine distribution; harmonic components are reduced to the greatest extent; the eddy current loss of the magnetic steel and the torque pulsation of the motor are simultaneously reduced; and the electromagnetic performance of the motor is enhanced. Furthermore, the multiple sections of the magnetic steel are arranged in the circumference along the rotor; the highest rotating speed of the safe operation of the rotor is greatly enhanced on machinery; the radial thickness which is needed by the magnetic circuit of the rotor is obviously reduced on the structure; the rotational inertia and weight of the rotor are reduced; the dynamic response of the motor is improved; and the requirements of a high-speed driving system on the performance of the motor are met.
Owner:SHANGHAI UNIV
Multitooth magnetic bridge type hybrid excitation magnetic flux switching motor
InactiveCN101834474AReduced risk of irreversible demagnetizationReduce lossMagnetic circuit stationary partsLow speedTooth number
The invention discloses a multitooth magnetic bridge type hybrid excitation magnetic flux switching motor. Permanent magnets, an armature winding and a single-phase excitation winding are installed on a stator; the tooth number of the stator is four times of the number of the permanent magnets; and part of a rotor part is a salient pole, and a rotor has no winding or permanent magnets and has simple and firm structure. An air gap magnetic field comprises an electric excitation magnetic field generated by the excitation winding and a magnetic field generated by the permanent magnets and is adjusted by changing the magnitude and the direction of excitation current, thereby improving the rotating speed operating range and the magnetic weakening capability of the motor. An electric excitation magnetic force line is connected with a magnetic bridge for closing after penetrating through an iron core at the top of the permanent magnets, which is beneficial to reducing the electric excitation ampere turns. The invention has parallel connecting structure of the excitation winding and the permanent magnet in space, bipolarity of phase magnetic flux, large magnetic chain change amplitude value and higher torque output capability and power density and is suitable for a low-speed straight application occasion.
Owner:CHANGZHOU INST OF TECH
Double-stator high-power-density flux switching permanent magnet motor
ActiveCN103647382ASimple structureImprove reliabilityElectric machinesDynamo-electric machinesElectric machinePermanent magnet motor
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Magnetic field modulation hybrid excitation motor and multi-working-wave design method thereof
ActiveCN111509941AIncreased working air gap areaIncrease output torqueSynchronous machine detailsMagnetic circuit stationary partsMagnetoEngineering
The invention discloses a magnetic field modulation hybrid excitation motor and a multi-working-wave design method thereof. The motor comprises a stator and a rotor, wherein the stator comprises a stator iron core, two sets of windings and permanent magnets, the two sets of windings comprise an armature winding and an exciting winding, the stator iron core is designed as an open slot, one set of windings is distributed in the open slot of the stator iron core, and is wound on one stator tooth in a centralized manner, the outer surface of each stator tooth is provided with a groove, the other set of windings is placed in the groove of the stator tooth, each stator tooth is split into two modulation teeth through the groove, one permanent magnet is placed on each modulation tooth, the otherwinding is wound on two adjacent modulation teeth formed by splitting different stator teeth in a centralized mode, and the magnetizing direction of the permanent magnets is consistent with or opposite to the direction of a magnetic field formed by the excitation winding on the modulation teeth. According to the invention, the permanent magnet magnetomotive force and the excitation magnetomotive force are connected in parallel on the magnetic circuit and are independent from each other, so that the risk of irreversible demagnetization caused by the introduction of an excitation current permanent magnet is avoided, and the effective exertion of the magnetic regulation capability is ensured.
Owner:JIANGSU UNIV
Direct-axis magnetic field enhanced type wide-range speed control permanent magnet brushless motor for electric automobile
ActiveCN104253499AMeet high torque performance requirementsImprove driving abilityMagnetic circuit rotating partsElectric machinesMagnetic barrierBrushless motors
The invention discloses a direct-axis magnetic field enhanced type wide-range speed control permanent magnet brushless motor for an electric automobile. A magnetic barrier fills each slot of a rotor, and the magnetic barriers are symmetrical relative to a centerline, i.e., a quadrature axis, of slot parts of the rotor; four sections of arc-shaped permanent magnet steel are fixedly embedded on each tooth part of the rotor, the four sections of arc-shaped permanent magnet steel are divided into an inner layer and an outer layer, two sections are arranged on each layer, the two sections of permanent magnet steel on each layer are the same in structure and are symmetrical relative to a centerline, i.e., a direct axis of the tooth parts of the rotor, the two sections of permanent magnet steel on the same layer do not run through each other and are not connected with each other, and an arc-shaped magnetic bridge is formed between the two sections of permanent magnet steel; a circle center of each section of permanent magnet steel is located on the diameter of the rotor; the direct-axis inductance of the motor is larger than the quadrature-axis inductance, so that the motor can adopt a control method with zero direct-axis current and can also adopt a direct-axis magnetic field enhanced control method during low-speed operation or startup, and can adopt a coordinated control method of direct-axis magnetic field enhancement and slight direct-axis magnetic field weakening during high-speed operation, and the speed control range is wider.
Owner:JIANGSU UNIV
Partitioned stator type hybrid excitation motor
ActiveCN105958763AAvoid conflicts in installation spacePreserve high power density characteristicsMagnetic circuit rotating partsMagnetic circuit stationary partsConductor CoilMotor power
The invention discloses a partitioned stator type hybrid excitation motor in the field of electricians and motors. The partitioned stator type hybrid excitation motor is characterized in that the external part of a rotating shaft is provided with an inner stator, a middle rotor and an outer stator which are coaxially arranged in sequence from the inside out, the outer stator is uniformly provided with 36 outer stator teeth along the circumferential direction, and the outer stator teeth are wound with armature windings; the inner stator is uniformly provided with 36 inner stator teeth along the circumferential direction, the inner stator teeth are wound with centralized excitation windings, the middle rotor is forming by uniformly placing 16 magnetic conduction blocks and 16 permanent magnets along the circumferential direction in an alternative manner, the magnetic conduction blocks and the permanent magnets are identical in inner diameter and outer diameter, side surfaces of the magnetic conduction blocks and the permanent magnets are closely fit together, magnetizing directions of adjacent two permanent magnets differ 90 degrees, and the N poles of 16 permanent magnets along the clockwise circumferential direction reversely rotate by 90 degrees anticlockwise in sequence, so that permanent magnet flux at the armature winding side when the permanent magnets carry out excitation independently is effectively increased, and influences imposed on the excitation winding side by a permanent magnetic field are reduced while improving the power density of the motor.
Owner:JIANGSU UNIV
Tangential-magnetized magnetic flux reversed mixed excitation linear motor
ActiveCN103633810AReduced risk of irreversible demagnetizationImprove reliabilityPropulsion systemsFault toleranceElectric machine
The invention discloses a tangential-magnetized magnetic flux reversed mixed excitation linear motor, which comprises a primary rotor and a secondary stator; the primary rotor is formed by connecting primary modules in parallel; the primary rotor and the secondary stator are all made of a permeability magnetic material; the secondary stator is of a salient pole structure with equal tooth width; an air gap exists between the primary rotor and the secondary stator; two armature teeth are respectively arranged at two sides of each primary module; one excitation tooth is arranged between two armature teeth; one set of armature winding is wound on each armature tooth; one set of excitation winding is wound on each excitation tooth; two tangential-magnetized permanent magnets with opposite polarity are pasted at the end part of each armature tooth. The risk that the permanent magnets can not be reversely demagnetized is reduced, the reliability of a motor is improved, the problem of easy saturation of a narrow permeability magnetic bridge is solved, the fault tolerance performance of the motor is improved and the tangential-magnetized magnetic flux reversed mixed excitation linear motor is suitable for the application occasions needing large-range speed change operation.
Owner:JIANGSU UNIV
Zero-sequence-current suppressing winding open type permanent magnet synchronous motor vector control method
ActiveCN108418489ASuppression of zero sequence currentImprove voltage utilizationElectronic commutation motor controlAC motor controlVoltage vectorControl vector
The invention discloses a zero-sequence-current suppressing winding open type permanent magnet synchronous motor (PMSM) vector control method, belonging to the motor control field. The zero-sequence-current suppressing winding open type permanent magnet synchronous motor vector control method is characterized in that a winding neutral point of the PMSM is opened; 6 output terminals are introducedto connect two output terminals of two-level inverters; each of the two two-level inverters is provided with one zero vector and 7 effective voltage vectors, so as to form 6 sectors; and a decouplingSVPWM control module which can suppress the zero sequence current distributes voltage commands to the two two-level inverters according to the principle that the size is the same and the direction isreverse, determines and demodulates the sectors in which the voltage vectors exist according to the size of the rotor position angle, and finally calculates the operating time of the effective voltagevectors and the zero vector of each sector, so that the zero sequence voltage generated from the zero vector can be used to offset or weaken the zero sequence voltage which is generated when the effect vectors are synthesized so as to suppress the zero sequence current and improve the utilization rate of voltage.
Owner:JIANGSU UNIV
Disc type double-stator hybrid excitation motor
ActiveCN106487178AImprove fault toleranceImprove magnetic field adjustment abilityMagnetic circuit rotating partsMagnetic circuit stationary partsHigh power densityPhysics
The invention discloses a disc type double-stator hybrid excitation motor. According to the hybrid excitation motor designed in the invention, based on the principle of magnetic field modulation, the combination of a disc type permanent magnet motor and an electric excitation system is realized. The hybrid excitation motor has the characteristics of high power density, high moment density, a short axial size and a compact structure and also has the advantages of flexible adjustment of an excitation magnetic field and a wide speed regulation range, and thus the hybrid excitation motor can be applied to the field of electric vehicle hubs. The motor comprises two stators and one disc type rotor. An excitation winding and an armature winding are respectively arranged at the stators at two sides, and a permanent magnet pole and a core pole are distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on an inner stator generate a magnetic field same with an armature winding pole pair number at an external air gap, and a permanent magnet pole and an iron pole are uniformly distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on the inner stator generates a magnetic field same with the armature winding pole pair number at the external air gap, and thus the electromechanical energy conversion is realized. The back EMF waveform is improved through the design of a multi-phase structure and a three-layer fractional-slot integrated winding, and the reliability and fault tolerance of the motor are improved at the same time.
Owner:SOUTHEAST UNIV
Linear permanent magnet motor operating mechanism of high-voltage circuit breaker
InactiveCN102157310AControl speedSimple structureSwitch power arrangementsProtective switch operating/release mechanismsElectric machineElectrical polarity
The invention relates to a linear permanent magnet motor operating mechanism of a high-voltage circuit breaker, comprising a stator core, a rotor core, drive rods and permanent magnets, wherein the stator core is a box body; the rotor core is arranged in the stator core; the drive rods arranged on both ends of the rotor core penetrate through shells positioned on the upper and the lower ends of the rotor core and can move up and down; the side wall of the stator core is provided with the permanent magnets; upper and lower adjacent permanent magnets are opposite in polarity; the permanent magnets positioned on the left and the right edges of the box body are same in polarity placement directions; stator salient poles with the number of integral multiples of a phase number are arranged on the inner side wall of the stator core and between the two adjacent permanents and are provided with armature coils; the outer side wall of the rotor core is provided with rotor salient poles; when therotor core is positioned on a highest position, the stator salient pole positioned on the uppermost end of the stator core just faces to the rotor salient poles; and when the rotor core is positionedon a lowest position, the stator salient pole positioned on the lowest end of the stator core just faces to the rotor salient poles.
Owner:SOUTHEAST UNIV
Bilateral consequent pole type hybrid excitation brushless motor
ActiveCN113489274AImprove magnetic modulation efficiencyAchieving positive stackingMagnetic circuit rotating partsElectric machinesBrushless motorsElectric machine
The invention discloses a bilateral consequent pole type hybrid excitation brushless motor which comprises a first stator and rotor, a second stator and rotor, an armature winding and an annular direct current excitation winding. The first stator and rotor and the second stator and rotor are arranged in parallel in the axial direction. The first stator and rotor comprises a stator I and a rotor I; the second stator and rotor comprises a stator II and a rotor II; the first stator and the second stator jointly form a stator, and stator iron core poles and stator permanent magnet poles are evenly and alternately distributed in the circumferential direction. The rotor I and the rotor II jointly form a rotor, and rotor iron core poles and rotor permanent magnet poles are evenly and alternately distributed in the circumferential direction. The armature winding is wound in the stator slot; and the annular direct current excitation winding is arranged in an axial air gap between the first stator and the second stator. The annular direct-current excitation winding is arranged between the stator I and the stator II, space constraint does not exist between the annular direct-current excitation winding and the armature winding in the stator groove, the problem that the output capacity and the magnetic adjusting capacity of a traditional stator permanent magnet type hybrid excitation motor are mutually restricted is solved, and the magnetic adjusting efficiency is high.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
A Double Stator Hybrid Excitation Motor with Halbach Permanent Magnet Array
ActiveCN109600010BSolve the problem of mutual limitation of installation spaceImprove space utilizationMagnetic circuit stationary partsElectric machineMagnetic poles
The invention discloses a double-stator mixed excitation motor with a Halbach permanent magnet array. An intermediate rotor is coaxially installed between an outer stator and an inner stator, the inner stator is composed of 1 inner stator yoke, 12 inner stator teeth, 12 circular arc-shaped Halbach permanent magnet array modules, 12 inner stator slots and 12 non-magnetic-conduction circular arc-shaped brackets, a bracket is connected between two adjacent inner stator teeth, electric excitation magnetic poles, magnetic channels and mixed magnetic field magnetic poles are respectively arranged onthe inner stator teeth from the inside to the outside, the inner stator tooth portions having a gap between the two brackets form the magnetic channels, concentrated excitation windings are sleeved on the electric excitation magnetic poles, a Halbach permanent magnet array module is fixedly arranged on an outer wall of each bracket, and the Halbach permanent magnet array module is embedded between two mixed magnetic field magnetic poles; and by adoption of the Halbach array structure arrangement, the single-sided magnetic field shielding property and the single-sided magnetization property thereof are fully utilized, the magnetic flux leakage of a permanent magnet at the inner stator is effectively reduced, the utilization rate of the permanent magnet is improved, and the torque output capability is enhanced.
Owner:合肥龙智机电科技有限公司
Variable salient pole rate permanent magnet motor and design method thereof
ActiveCN114204710AIncrease loading capacityReduced risk of irreversible demagnetizationMagnetic circuit rotating partsElectric machinesElectric machineMagnetic reluctance
The invention discloses a variable salient pole rate permanent magnet motor and a design method thereof, the variable salient pole rate permanent magnet motor comprises a stator and a rotor, the rotor comprises a plurality of modularized independent rotor units (3), segmented and regional saturation of a rotor magnetic circuit is realized by means of differentiated rotor material attributes, quadrature-axis inductance is indirectly adjusted by adjusting armature current, and the salient pole rate of the rotor is improved. Therefore, the salient pole rate of the motor is changed. According to the invention, the reverse salient rate characteristic can be realized at a low speed, the torque output capability of the motor is improved, and the irreversible demagnetization risk of the motor is reduced; the positive salient pole rate characteristic is realized at a high speed, the reluctance torque is fully utilized, and the loading capacity of the motor at the high speed is improved.
Owner:JIANGSU UNIV
Magnetic flux switching permanent magnet motor structure for inhibiting demagnetization of permanent magnet
InactiveCN113113982AReduced risk of irreversible demagnetizationActs as an inhibitorMagnetic circuit rotating partsMagnetic circuit stationary partsElectric machinePermanent magnet motor
The invention provides the magnetic flux switching permanent magnet motor structure for inhibiting demagnetization of a permanent magnet. The magnetic flux switching permanent magnet motor structure comprises a stator and a rotor, the rotor is composed of a rotating shaft and a rotor iron core, and the stator is composed of a stator iron core, a permanent magnet and an armature winding. The stator iron core is composed of U-shaped silicon steel sheet iron core units. The length of the permanent magnet is reduced compared with that of a permanent magnet of a traditional magnetic flux switching permanent magnet motor, the widths at the two sides (close to the air gap side and the machine shell side) of the permanent magnet are reduced, the permanent magnet is closely spliced between the two iron core units, and the rotor iron core is of a salient pole structure. According to the magnetic flux switching permanent magnet motor structure for inhibiting the local irreversible demagnetization of the permanent magnet, the irreversible demagnetization risk of the permanent magnet under the two conditions of no load and load in the magnetic flux switching permanent magnet motor is reduced, the permanent magnet consumption is reduced, the permanent magnet utilization rate is improved, and the output torque of the motor is maintained while the manufacturing cost of the motor is saved.
Owner:NANJING NORMAL UNIVERSITY
A dual-stator hybrid excitation motor based on magnetic field modulation
ActiveCN106026583BImprove space utilizationIncreased torque densityMagnetic circuit rotating partsSynchronous machine detailsFault tolerancePermanent magnet synchronous motor
The invention discloses a magnetic field modulation-based double-stator hybrid excitation motor. Combination of a brushless electric excitation system and a permanent magnet synchronous motor is relatively well achieved by the designed hybrid excitation motor; and the hybrid excitation motor has the characteristics of high power density, high torque density and the like of a permanent magnet motor, also has the advantages that the excitation magnetic field can be flexibly adjusted and the speeding regulating range is wide, so that the hybrid excitation motor can be better applied to the field of driving of electric vehicles and the like. Meanwhile, by a magnetic field modulation technology, a permanent magnet on a rotor and an exciting winding on an inner stator generate a magnetic field which is the same as that of an armature winding in number of pole pairs in an external air gap, so that electromechanical energy conversion is achieved. A permanent magnet with an asymmetric V-shaped structure on the rotor has a unilateral magnetism gathering effect, so that the torque quality of the motor is effectively improved; an electric excitation winding does not need an electric brush or a slip ring; and meanwhile, the reliability and the fault tolerance of the motor is improved by a double-stator design.
Owner:SOUTHEAST UNIV
Long-stroke linear permanent magnet motor operation mechanism of high-voltage breaker
ActiveCN102157309AControl speedSimple structureSwitch power arrangementsProtective switch operating/release mechanismsElectric machineElectrical polarity
The invention provides a long-stroke linear permanent magnet motor operation mechanism of a high-voltage breaker. Long-stroke linear permanent magnet motor operation mechanism of high-voltage breaker is characterized in that the operation mechanism comprises a stator core, a rotor core, a driving rod and a permanent magnet, wherein the stator core is a box body; the rotor core is disposed in the stator core; the driving rod disposed at two ends of the rotor core passes through the upper and lower end shells of the stator core and can move up and down; the inner side wall of the stator core isprovided with a stator salient pole; the permanent magnet is disposed in the stator salient pole; the polarities of the upper and lower adjacent permanent magnets are opposite; the polarity arrangingdirections of the permanent magnets at left and right sides of the box body are the same; the stator salient pole is provided with an armature coil; the top part of the stator salient pole is provided with a pole shoe; the outer side wall of the rotor core is provided with a rotor salient pole; when the rotor core is located at the highest position, the lower half section of the stator salient pole at the uppermost end of the stator core faces the rotor salient pole; when the rotor core is located at the lowest position, the upper half section of stator salient pole at the lowest end of the stator core faces the rotor salient pole.
Owner:SOUTHEAST UNIV
A magnetic field modulation hybrid excitation motor and its multi-operating wave design method
ActiveCN111509941BIncrease output torqueTake advantage ofSynchronous machine detailsMagnetic circuit stationary partsMagnetomotive forceElectric machine
Owner:JIANGSU UNIV
Vector control method of open-winding permanent magnet synchronous motor with suppressed zero-sequence current
ActiveCN108418489BSuppression of zero sequence currentImprove voltage utilizationElectronic commutation motor controlAC motor controlVoltage vectorControl vector
The invention discloses a zero-sequence-current suppressing winding open type permanent magnet synchronous motor (PMSM) vector control method, belonging to the motor control field. The zero-sequence-current suppressing winding open type permanent magnet synchronous motor vector control method is characterized in that a winding neutral point of the PMSM is opened; 6 output terminals are introducedto connect two output terminals of two-level inverters; each of the two two-level inverters is provided with one zero vector and 7 effective voltage vectors, so as to form 6 sectors; and a decouplingSVPWM control module which can suppress the zero sequence current distributes voltage commands to the two two-level inverters according to the principle that the size is the same and the direction isreverse, determines and demodulates the sectors in which the voltage vectors exist according to the size of the rotor position angle, and finally calculates the operating time of the effective voltagevectors and the zero vector of each sector, so that the zero sequence voltage generated from the zero vector can be used to offset or weaken the zero sequence voltage which is generated when the effect vectors are synthesized so as to suppress the zero sequence current and improve the utilization rate of voltage.
Owner:JIANGSU UNIV
A Partition Stator Type Hybrid Excitation Motor
ActiveCN105958763BAvoid conflicts in installation spacePreserve high power density characteristicsMagnetic circuit rotating partsMagnetic circuit stationary partsConductor CoilClockwise
Owner:JIANGSU UNIV
A Tangentially Magnetized Flux Reverse Hybrid Excitation Linear Motor
ActiveCN103633810BReduced risk of irreversible demagnetizationImprove reliabilityPropulsion systemsFault toleranceMagnetization
The invention discloses a tangentially magnetized magnetic flux reverse mixed excitation linear motor, comprising a primary mover and a secondary stator, the primary mover is formed by connecting primary modules in parallel, the primary mover and The secondary stators are all made of magnetically permeable materials, the secondary stators are salient pole structures with equal tooth widths, there is an air gap between the primary movers and the secondary stators, and the two sides of the primary module are respectively There are two armature teeth, an excitation tooth is arranged between the two armature teeth, a set of armature windings is wound around each of the armature teeth, and a set of armature windings is wound around each of the excitation teeth. The field winding is covered, and two pieces of tangentially magnetized permanent magnets with opposite polarities are attached to the ends of the armature teeth. The risk of irreversible demagnetization of the permanent magnet is reduced, and the reliability of the motor is improved. It solves the problem that the narrow magnetic bridge is easy to saturate. The fault tolerance performance of the motor is improved. Suitable for applications requiring a wide range of variable speed operation.
Owner:JIANGSU UNIV
Double stator high power density flux switching permanent magnet motor
ActiveCN103647382BImprove cooling effectSimple structureElectric machinesDynamo-electric machinesElectric machinePermanent magnet motor
The invention provides a double-stator high-power-density flux switching permanent magnet motor. The double-stator high-power-density flux switching permanent magnet motor comprises an outer stator, an inner stator and a rotor, and air gaps exist between the rotor and the stators. The rotor is composed of magnetic blocks, the magnetic blocks are evenly distributed in space and can be arranged at intervals or connected into a whole through connecting bridges; the outer stator is composed of U-type magnetic blocks, tangential magnetized permanent magnets and concentrated windings; every permanent magnet is clamped between the corresponding two neighboring U-type magnetic blocks, and the concentrated windings are arranged inside the grooves of the U-type magnetic blocks and house the permanent magnets; the neighboring permanent magnets magnetize alternately each other in the tangent direction; the radial axises of U-type magnetic blocks of the inner stator and the outer stator mutually coincide, and the magnetic teeth of the U-type magnetic blocks of the inner stator and the outer stator are opposite to each other; the magnetizing directions of the permanent magnets of the inner stator and the outer stator, which are identical in spatial position, are inverse, and the concentrated windings of the inner stator and the outer stator, which are identical in spatial position, are on the same phase. Compared with the prior art, the double-stator high-power-density flux switching permanent magnet motor omits rotor magnetic yokes, reduces the size of the rotor and the consumption of iron, improves the power density and the efficiency and can be applied to power systems such as wind power generation, electric vehicles and ships and warships.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Rotor of built-in permanent magnet motor and magnetic steel structural parameter determining method thereof
InactiveCN102157998BHigh mechanical strengthIncrease stiffnessMagnetic circuit rotating partsElectric machinePermanent magnet motor
Owner:SHANGHAI UNIV
A fractional slot concentrated winding permanent magnet motor with low vibration and noise performance and its design method
ActiveCN107579606BReduce harmonic amplitudeReduce MMF tooth harmonicsMagnetic circuit stationary partsWindings conductor shape/form/constructionLow noiseConductor Coil
The invention discloses a low-vibration noise performance fractional slot concentrated winding permanent magnet motor and a design method, and belongs to the field of rotating motors. On the basis ofa motor matched with an existing notched pole, and some stator additional teeth are correspondingly added (the specific number of the teeth is determined according to the matched notched pole of the motor). For a three-phase 18 / 16 motor, six additional teeth are added, the position of each stator notch is calculated, and the winding structure adopts a concentrated winding structure corresponding to the three-phase 18 / 16 motor. The rotor structure adopts the common surface-mounted structure, and radial magnetizing is adopted; the motor has the advantages that the stator structure is changed, the content of tooth harmonic waves in the winding magnetomotive force in an air gap is lowered, therefore, the motor vibration and noise are lowered, and meanwhile the rotating torque of the motor is ensured. In addition, due to changes of the stator structure, the content of subharmonic waves of the magnetomotive force in the air gap is lowered, and then eddy-current losses generated in the permanent magnet are lowered. Accordingly, the motor has the great significance in motor body designing.
Owner:JIANGSU UNIV
A zero-sequence current suppression control system and method for rare-earth permanent magnet motors
ActiveCN106655936BEliminate the effects ofReduce difficultyElectronic commutation motor controlElectric motor controlPhase currentsBrushless motors
The invention discloses a rare earth lacking permanent magnet motor zero sequence current suppressing and controlling system and method, which are applied to a motor control field. The method comprises the following steps: using an id=0 closed-loop vector control method for the rotation speed n and the current id and iq to obtain the outputted voltage ud* and uq*; subtracting the given o-axis current i0* from the o-axis i0 to obtain the differential current delta i0 and inputting the delta i0 into a harmonic wave suppressing module which calculates and obtains the zero sequence outputted u0*; inputting the voltage ud* and uq*, the zero sequence outputted u0*, and the rotor position angle theta together into a zero sequence voltage SVPWM module to drive two standard two-level inverters; and connecting the two two-level inverters to the two ends of the windings of the rare earth lacking permanent magnet brushless motor with opened neutral points. With the system and method, it is possible to monitor and give feedback on the zero sequence current in real time and to eliminate the influence of back electromotive force multiple harmonic waves on motor phase current once for all without the need of suppressing the multiple harmonic waves one by one or the need of doing so by more hardware.
Owner:JIANGSU UNIV
Long-stroke linear permanent magnet motor operation mechanism of high-voltage breaker
ActiveCN102157309BControl speedSimple structureSwitch power arrangementsProtective switch operating/release mechanismsElectrical polarityEngineering
Owner:SOUTHEAST UNIV
Low-space harmonic single/double-layer winding radial flux five-phase permanent magnet synchronous motor
ActiveCN113890297AImprove reliabilityReduce harmonic contentMagnetic circuit rotating partsElectric machinesElectric machinePermanent magnet synchronous motor
The invention discloses a low-space harmonic single / double-layer winding radial flux five-phase permanent magnet synchronous motor, belongs to the field of motors, and aims to solve the problem that the harmonic content in magnetomotive force synthesized by a stator winding of a five-phase permanent magnet synchronous motor adopting a fractional slot concentrated winding is relatively large. The motor comprises a stator and a rotor, the stator is coaxially arranged outside the rotor, the stator is provided with ten stator slot units in the circumferential direction, the winding modes of five-phase windings are the same, and the phase differences of the B-phase winding, the C-phase winding, the D-phase winding and the E-phase winding are 72 degrees, 144 degrees, 216 degrees and 288 degrees in sequence relative to the A-phase winding in the spatial position; each phase of winding comprises two groups of coils, the space position difference of two pairs of coils in each group is 180 degrees, each pair of coils is arranged in one double-layer winding groove and two single-layer winding grooves in the two sides, the winding directions of the two coils in each pair are opposite, and the coil pitch is gamma; the two coils are connected in series to form a winding; and an included angle xi value and a coil pitch gamma value of the two groups of coils in the spatial position are limited so as to weaken the amplitude of near-pole sub-harmonics in the synthesized magnetomotive force.
Owner:HARBIN INST OF TECH
A disc-type dual-stator hybrid excitation motor
ActiveCN106487178BRealize mixed excitationThe overall structure is simple and reliableMagnetic circuit rotating partsMagnetic circuit stationary partsFault toleranceElectric machine
The invention discloses a disc type double-stator hybrid excitation motor. According to the hybrid excitation motor designed in the invention, based on the principle of magnetic field modulation, the combination of a disc type permanent magnet motor and an electric excitation system is realized. The hybrid excitation motor has the characteristics of high power density, high moment density, a short axial size and a compact structure and also has the advantages of flexible adjustment of an excitation magnetic field and a wide speed regulation range, and thus the hybrid excitation motor can be applied to the field of electric vehicle hubs. The motor comprises two stators and one disc type rotor. An excitation winding and an armature winding are respectively arranged at the stators at two sides, and a permanent magnet pole and a core pole are distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on an inner stator generate a magnetic field same with an armature winding pole pair number at an external air gap, and a permanent magnet pole and an iron pole are uniformly distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on the inner stator generates a magnetic field same with the armature winding pole pair number at the external air gap, and thus the electromechanical energy conversion is realized. The back EMF waveform is improved through the design of a multi-phase structure and a three-layer fractional-slot integrated winding, and the reliability and fault tolerance of the motor are improved at the same time.
Owner:SOUTHEAST UNIV
Built-in magnetic barrier type magnetic field enhanced permanent magnet brushless motor
ActiveCN106026597BIncrease profitModerate thicknessMagnetic circuit rotating partsSynchronous machine detailsMagnetic barrierBrushless motors
The invention discloses a built-in magnetic barrier type magnetic field enhanced permanent magnet brushless motor, comprising a stator and a rotor coaxially sleeved inside the stator. The rotor is evenly embedded with a plurality of pairs of permanent magnetic steels along the circumference, and each pair of the permanent magnetic steels are composed of two blocks of neodymium iron boron permanent steels of the same rectangular structure and placed in a V manner. The V-shaped opening faces an air gap and the adjacent two pairs of permanent magnetic steels are arranged symmetrically on the two sides of a cross axis; the inner part of the rotor between adjacent two pairs of permanent magnetic steels is provided with a first group of arc shaped built-in magnetic barriers whose arc openings face the air gap; a second group of arc shaped built-in magnetic barriers and a third group of arc shaped built-in magnetic barriers whose arc openings face the air gap and whose structures are identical and are symmetrically arranged around a straight axis are arranged between the two neodymium iron boron permanent steels of each pair of the permanent magnetic steels. Each group of the arc shaped built-in magnetic barriers contains an inner magnetic barrier and an outer magnetic barrier. The adjacent two pairs of permanent magnetic steels alternate for tangential magnetization, and the tangential magnetization directions of two blocks of neodymium iron boron permanent steels in each pair of the permanent magnetic steels are opposite to each other, which improves the driving performance and reliability of the motor.
Owner:SUMEC HARDWARE & TOOLS
Linear permanent magnet motor operating mechanism of high-voltage circuit breaker
InactiveCN102157310BControl speedSimple structureSwitch power arrangementsProtective switch operating/release mechanismsElectric machineElectrical polarity
The invention relates to a linear permanent magnet motor operating mechanism of a high-voltage circuit breaker, comprising a stator core, a rotor core, drive rods and permanent magnets, wherein the stator core is a box body; the rotor core is arranged in the stator core; the drive rods arranged on both ends of the rotor core penetrate through shells positioned on the upper and the lower ends of the rotor core and can move up and down; the side wall of the stator core is provided with the permanent magnets; upper and lower adjacent permanent magnets are opposite in polarity; the permanent magnets positioned on the left and the right edges of the box body are same in polarity placement directions; stator salient poles with the number of integral multiples of a phase number are arranged on the inner side wall of the stator core and between the two adjacent permanents and are provided with armature coils; the outer side wall of the rotor core is provided with rotor salient poles; when therotor core is positioned on a highest position, the stator salient pole positioned on the uppermost end of the stator core just faces to the rotor salient poles; and when the rotor core is positionedon a lowest position, the stator salient pole positioned on the lowest end of the stator core just faces to the rotor salient poles.
Owner:SOUTHEAST UNIV
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