623 results about "Torque density" patented technology

The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent magnet dual-rotor is located inside and outside of a torus-shaped stator with back-to-back windings, respectively. The machine substantially improves machine efficiency by reducing the end windings and boosts the torque density by at least doubling the air gap and optimizing the machine aspect ratio.

An adaptive architecture for electric motors, generators and other electric machines. An adaptive electric machine provides optimal performance by dynamically adapting its controls to changes in user inputs, machine operating conditions and machine operating parameters. Isolating the machine's electromagnetic circuits allows effective control of more independent machine parameters, enabling greater freedom to optimize and providing adaptive motors and generators that are cheaper, smaller, lighter, more powerful, and more efficient than conventional designs. An electric vehicle with in-wheel adaptive motors enables delivery of higher power with lower unsprung mass, giving better torque-density. The motor control system can adapt to the vehicle's operating conditions, including starting, accelerating, turning, braking, and cruising at high speeds, thereby consistently providing higher efficiency. A wind powered adaptive generator can adapt to changing wind conditions, consistently providing optimal performance. An adaptive architecture may improve performance in a wide variety of electric machine applications, particularly those requiring optimal efficiency over a range of operating conditions.

The invention belongs to the technical field of motors, discloses a multi-phase reluctance machine and solves the problem that only works for a half electric cycle, the conventional switch reluctance machine can acquire the one-way torque, thus the torque density of the motor is low. An armature core is in a cylinder shape. A plurality of axial slots are formed in the side surface of an airspace of the armature core to form a structure in which stator poles and stator slots are spaced along a peripheral direction. Each stator pole is wounded by an armature coil. Along the peripheral direction of the armature core, co-phasal armature coils are sequentially connected to for a phase armature winding, and a multi-phase winding, composed of the phase armature windings, is an armature winding. Excitation units are arranged on a yoke portion of the armature core or the stator poles. A rotator comprises a rotator core. A plurality of axial slots are formed in the side surface of an air gap of the rotator core to form a structure in which rotator poles and rotator slots are spaced along the peripheral direction.

A high torque active mechanism for an orthotic and/or prosthetic joint using a primary brake which can be provide by magnetorheological (MR) rotational damper incorporating and an additional friction brake mechanism driven by the braking force generated by the MR damper. This combination of MR damper and friction brake mechanism allows an increase in torque density while keeping the same level of motion control offered by the MR damper alone. The increased torque density achieved by this high torque active mechanism allows to minimize the size of the actuating system, i.e. its diameter and/or breath, while maximizing its braking torque capability. In this regard, the friction brake mechanism is advantageously positioned around the MR damper, such that the dimension of the package is minimized.

The invention discloses a mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and a winding switching magnetism-weakening control method thereof. The mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor comprises a salient rotor and a stator, wherein the stator contains stator cores, aluminium-nickel-cobalt permanent magnets, neodymium-iron-boron permanent magnets, centralized armature windings and pulsed magnetism-adjusting windings; iron core edges of two adjacent outer U-shaped units and tangentially-magnetized long-stripped neodymium-iron-boron permanent magnets form a first permanent magnetic pole, while the circumferentially-inward (outward) and parallel-magnetized V-shaped embedded aluminium-nickel-cobalt permanent magnets and inner U-shaped units form a second permanent magnetic pole; mixed magnetic poles are in alternating polarity distribution; when the motor runs at a low speed, the pulsed magnetism-adjusting windings are in direct-current pulsed working state, while in a high-speed weak-magnetism area, the pulsed magnetism-adjusting windings are converted into alternating-current armature windings. Requirements on performance in a low-speed area and in the high-speed area can be met at the same time; influence of an armature reaction field on the aluminium-nickel-cobalt permanent magnets with low coercivity is small; the utilization rate of permanent magnetism, the torque density, and the reliability of system operation are high.

The invention discloses a radial magnetic field double-stator vernier motor which comprises a ring-shaped rotor (2) and two cylindrical stators (1 and 4). Multiple permanent magnets are arranged on the periphery of a ring body of the rotor at uniform intervals, multiple grooves are reserved on the peripheral wall of a cylinder body of each stator, each groove is used for accommodating a winding, and a projection between each two adjacent grooves forms a stator tooth. The radial magnetic field double-stator vernier motor is characterized in that the two stators (1 and 4) are different in diameter and are in coaxial inner-outer sleeving arrangement, the grooves on the two stators are identical in number, the rotor (2) is coaxially sleeved between the two stators (1 and 4), and distance between each stator tooth of the inner stator (4) and the corresponding stator tooth of the outer stator (1) is half of a groove spacing angle peripherally. Under the circumstance that the motor is similar to a traditional vernier motor in torque density, power factor is improved greatly and can reach above 0.8.

The invention discloses a disc type axial-flux motor with an oil-immersed circularly cooled stator and segmented armatures. A framework with double rotors and single stator is adopted; and a main shaft is designed. Each rotor adopts a magnetic steel surface-mounting type structure; and a whole stator oil-immersion circulation cooling and heat dissipation mode is adopted for temperature rise management. The disc type axial-flux motor with the oil-immersed circularly cooled stator and the segmented armatures comprises a stator assembly, a driving end rotor assembly, a non-driving end rotor assembly, a wire outlet box assembly and a rotary transformer assembly. An engine base is provided with an oil inlet joint and an oil outlet joint, both of which can carry out oil-immersion circulation cooling for the stator and have the advantages such as high convective heat transfer efficiency, big heat exchange area and fast heat transfer speed. The disc type motor adopting such a heat dissipation structure can achieve higher power density and higher torque density, is more compact in structure and is suitable for the occasions with strict requirements on the motor mounting space in future.

The present invention discloses a stator permanent-magnetic doubly salient disc-type motor, which comprises stator mechanisms, a rotor mechanism and a motor shaft, wherein the rotor mechanism is arranged between the two stator mechanisms, the rotor mechanism and the stator mechanisms are arranged on the motor shaft, each stator mechanism comprises a stator core, two permanent magnets and 2N annular armature windings, 2N stator teeth are evenly distributed on the inner wall of each stator core, a groove between every two adjacent stator teeth is a stator groove, the permanent magnets magnetized in the peripheral direction are arranged in centers of any pair of stator grooves on the same diameter, and the 2N annular armature windings respectively sleeve the 2N stator teeth; and the rotor mechanism comprises a plurality of rotor cores and a non-magnetic-conductive rotor bracket, the plurality of rotor cores are evenly distributed on the outer circumference of the non-magnetic-conductive rotor bracket, and the rotor cores form rotor salient poles. The stator permanent-magnetic doubly salient disc-type motor can effectively improve the reliability of the motor, reduces size and weight of the motor, improves power density and torque density of the motor, and is suitable to be used in occasions with strict requirements on size of generators or motors.

The invention discloses a non-uniform arrangement carnassial tooth fixed rotor permanent magnet vernier motor, and relates to the technical field of a permanent magnet direct driving motor. The motorcomprises components such as a stator and a rotor, wherein the stator comprises a stator yoke, a stator big tooth, stator carnassial teeth, a winding and a stator permanent magnet; the rotor comprisesa rotor yoke, a rotor tooth and a rotor permanent magnet; the stator big teeth connected with the stator yoke are in non-uniform arrangement on the space; the stator big tooth is split into stator carnassial tooth at the tail end; the stator permanent magnet is put in a groove formed by the stator carnassial tooth; the winding is put into a groove formed by the big tooth; the rotor permanent magnet is put into a groove formed by the rotor tooth. The limitation on the permanent magnet motor winding group pole pair number and the rotor pole pair number is solved, so that the motor is suitable for ultra-low-speed operation; the tooth harmonic torque is weakened, so that the motor operation is stable; the air gap magnetic density is improved, so that the torque density is increased by the motor. The motor is applicable to occasions of direct driving machine tool rotating table, a robot joint and the like. The speed reducing machine can be replaced; the market application prospects are wide.

The invention discloses a stator-rotor double-permanent-magnet-type-vernier motor which comprises a stator (1) and a rotor (2) coaxial with the stator (1). An air gap (9) is arranged between the stator (1) and the rotor (2). The stator (1) comprises a stator yoke and stator teeth (8) which extend in the radial direction from the outer surface of the stator yoke. A stator groove is formed by adjacent stator teeth (8) and the stator yoke. Stator permanent magnets (5) are arranged in each stator groove. The stator permanent magnets (5) in the same stator groove are arranged at certain spacing distance. An armature inner layer winding (3) is wound between adjacent stator teeth (8). According to the motor, rotor side permanent magnet flux leakage is obviously restrained, torque density is improved to the maximum degree, permanent magnets in a claw pole groove have a slot wedge effect, a claw pole winding is fixed in a groove, so that the structure is compact, the magnetizing directions of the permanent magnets are the same, and machining is easy.

The invention discloses an axial-magnetic-field double-stator vernier motor which comprises a rotor and two stators. The rotor is shaped in a circular ring, multiple permanent magnets are uniformly arranged on the circumference of the ring at intervals, the stators are shaped in circular rings, multiple grooves are uniformly arranged on the circumference on the end faces of one ends of the rings and used for containing windings, and stator teeth are formed by protrusions among the grooves. The axial-magnetic-field double-stator vernier motor is characterized in that the two stators are coaxially arranged at an interval in an opposite groove manner, the rotor is coaxially arranged between the two stators, and half of a slot-pitch angle is distant between the stator teeth of the first stator and the stator teeth of the second stator. The vernier motor adopts an axial-magnetic-field double-stator structure, so that the torque density of the vernier motor is similar with that of conventional vernier motors and the power factor is evidently increased up to more than 0.8.

The invention provides a magnetic flux switching type transverse magnetic flux permanent magnetism wind mill generator, which is a novel transverse magnetic flux permanent magnetism wind mill generator which is high in power density and torque density and is directly driven. A stator consists of a plurality of stator cores(1) distributed around a rotor and an armature winding(4); each stator core(1) is U-shaped, both sides of the stator core(1) are embedded with a first permanent magnet(2) and a second permanent magnet(3), and magnetic pole directions of the two permanent magnets are opposite; the ring-shaped winding(4) is arranged in the stator; the magnetic poles of the first permanent magnets(2) of the two adjacent stator cores(1) are opposite, and the magnetic poles of the second permanent magnets(3) of the two adjacent stator cores(1) are also opposite; all rotor cores(5) are the same in size; the two adjacent rotor cores(5) are aligned left and right respectively and arranged at intervals; the rotor cores(5) are made by overlapping silicon steel sheets and arranged on a cylinder(8) made of non-magnetic conduction materials to form the whole rotor; and the rotor is connected with a rotating shaft of a motor (6) and then connected with a shell(7) through a bearing(9).

The invention discloses a little rare earth type wide speed regulation hybrid permanent magnetic flux switching double stator motor. According to the motor, X outer stator teeth are distributed uniformly and circumferentially on an inner surface of an outer stator, m phases of armature windings and magnetization windings are alternately wound on the X outer stator teeth; q magnetic conduction blocks and q insulation blocks are arranged on an outer circle surface of a rotor support of a middle rotor in a staggered mode; an inner stator comprises an inner stator core and a hybrid permanent magnetic unit, K hybrid permanent magnet units are uniformly embedded in the inner stator core along the circumference direction, each hybrid permanent magnet unit respectively comprises a middle non-rare-earth aluminum nickel cobalt permanent magnet and rare earth neodymium iron boron permanent magnets at two sides of the non-rare-earth aluminum nickel cobalt permanent magnet; a stator partitioning structure is employed, the armature windings and the permanent magnets are separated and are respectively arranged in the outer stator and the inner stator, a problem of mutual limit in quantity of traditional magnetic flux switching motor permanent magnets and armature windings is solved, and motor power density and torque density are easy to improve.

The invention provides a new magnetic gear and a magnetic transmission device based on the magnetic gear, which are used for solving the problem of higher cost of the existing magnetic gear without lowering the torque density of the magnetic gear. For the magnetic gear, permanent magnets of the inner and outer rotors of the magnetic gear are separated by a magnetic material and are tangentially magnetized, and the supporting parts of the inner and outer rotors are made from a non-magnetic material. In the invention, as magnetic fields are converged to be enhanced at opposite sides of two groups of permanent magnets, the number of the permanent magnets is reduced by one half and the cost of the magnetic gear is lowered by one quarter in the case of equal torque density, and meanwhile the magnetic transmission device can obtain relatively higher torque density as well as a large transmission ratio by virtue of cycloidal motion between the first group of permanent magnets and the second group of permanent magnets.

The invention discloses a permanent magnet reluctance synchronous motor rotor structure having high torque density. The permanent magnet reluctance synchronous motor rotor structure comprises a central rotating shaft and a rotor iron core; the rotor iron core is uniformly provided with P groups of through grooves along the circumferential direction; each group of through grooves comprises three layers of U-shaped through grooves arranged in the radial direction of the rotor iron core at intervals; and a permanent magnet is embedded in the straight bottom side of each U-shaped through groove. By means of the permanent magnet reluctance synchronous motor rotor structure disclosed by the invention, the permanent magnet torque component and the reluctance torque component are sufficiently utilized in the synthesis torque of a motor; and thus, the torque density of the motor is increased.

The invention discloses a system and method for high-voltage direct-current starting and power generation of a stator duplex winding asynchronous motor. A main loop comprises the stator duplex winding asynchronous motor, a rectifier bridge, a power converter, a direct-current power source, a diode, a control side direct-current capacitor and a power side direct-current capacitor. A detecting loop comprises a first voltage transducer, a second voltage transducer, a first current transducer and a second current transducer. A control loop comprises a digital signal processor and a driving circuit. Five-phase centralized full-pitch star-shaped structures are adopted by both sets of stator windings which are a power winding and a control winding of the stator duplex winding asynchronous motor. In the starting and power generating process, the power converter implants three times of proper harmonic currents to the motor through the control winding under the control of the digital signal controller, an air-gap magnetic field is controlled to be a standard square wave, and therefore the torque density and the power density of the motor are improved. The system and method for the high-voltage direct-current starting and power generation of the stator duplex winding asynchronous motor is simple in structure and free of electric brush sliding rings, can achieve the integration of start and power generation, and has the advantages of being high in power density and torque density, easy to operate with fault-tolerance and the like.

The invention discloses a halbach-array-based magnetic coupling transmission device, which comprises an input shaft, a bearing, a permanent magnet, a stator, a rotor, and an output shaft, wherein the output shaft and the input shaft are fixed on a support through bearings and bearing seats; the rotor and the input shaft are in transmission connection through a bearing arranged in the molding cavity in the rotor and are in clearance fit; the rotor and the output shaft are connected in a manner that the bearing is arranged eccentrically; the stator is nested outside the rotor and forms an eccentric mechanism with the rotor; the stator is fixed with a base; permanent magnets which can make the rotor rotate are arranged on the inside surface of the stator and the outside surface of the rotor respectively; an air gap is formed between the permanent magnets; and the magnetization directions of the two permanent magnet are arranged in an Halbach manner. The device overcomes the drawback caused by contact of the conventional mechanical gears and the drawbacks of low transmission torque density and small transmission ratio of the common permanent magnet gears.

The invention discloses a high torque density magnetic field modulation type magnetic gear, which comprises a permanent magnetic outer stator, a modulation rotor and a permanent magnetic inner rotor which are concentrically nested to one another and arranged sequentially from outside to inside; air gaps are formed between the permanent magnetic outer stator and the modulation rotor as well as between the modulation rotor and the permanent magnetic inner rotor respectively; a trapezoidal groove is formed in the inner surface of an outer stator iron core of the permanent magnetic outer stator; demagnetization inhibition grooves are formed in the two sides of the inner end of the trapezoidal groove respectively; a tangentially polarized inverted trapezoidal outer stator permanent magnet is embedded in the trapezoidal groove; the demagnetization inhibition grooves have the action of inhibiting local demagnetization of the outer stator permanent magnet; the modulation rotor is composed of a plurality of magnet regulating yokes and a plurality of non-magnetic conductive materials embedded with punched holes respectively; the non-magnetic conductive materials embedded with the punched holes are embedded between two adjacent magnet regulating yokes respectively; the permanent magnetic inner rotor is composed of inner rotor permanent magnets and an inner rotor iron core which are concentrically nested to one another sequentially from outside to inside; and the inner rotor permanent magnets have a simplified Halbach structure. According to the magnetic field modulation type magnetic gear provided by the invention, higher torque density is realized under low torque ripples.

There is provided a permanent magnet rotary motor that can maintain higher torque density and can also reduce cogging torque more greatly than a conventional permanent magnet rotary motor. A pair of end surfaces of each of permanent magnets used for a rotor are substantially parallel to a virtual plane that extends in the radial direction of a rotor core while passing through the centers of a stator core and an arc surface. Then, the length of the arc surface in the peripheral direction of a rotor core and inclinations of inclined surfaces are so determined that a pole arc ratio Ψ₁ of the arc surface and a pole arc ratio ψ₂ of a magnetic pole surface in each permanent magnet satisfy the relation of P/2N≦Ψ₂−Ψ₁≦1.38×P/2N.