150 results about "Startup winding" patented technology

An electronically commutated brushless DC motor primarily for fractional horsepower applications of the type where at any instant one motor winding is unpowered and used to detect back EMF zero-crossings which information is used to initiate winding commutations. The duration of the pulse produced in this winding due to dissipation of stored energy by free-wheel diodes in parallel with the commutation devices after supply of current has been removed from this winding is used to provide a measure of motor current. This allows for simplified commutation device current limiting circuits and is available for control purposes which are a function of motor torque. There is also disclosed a method for maximizing useful power output by reducing the phase angle between the motor current and the back EMF. This is accomplished by introducing a delay in commutating the motor windings beyond the occurrence of each back EMF zero-crossing, with the delay being a function of the time between commutations.

A tail end of a web is attached to a winding core via a two-component mechanism having a core component attached to the core and a web component attached to the web, the two components being attached to each other in releasable fashion. The mechanism assists startup of winding. Upon completion of unwinding, the web component detaches from the core component to expose a region of adhesive on a part of the web component that extends from the tail end of the web. The tail end thus can be spliced to a leading end of another web by attaching the leading end to the exposed adhesive on the web component.

A motor starter for use with a motor (20) having a main winding (M) and a start winding (S). The starter has a PTC thermistor (30) connected in series with the start winding (S). A triac (40) is connected between PTC thermistor (30) and a power source line. A control circuit (50) is connected to the power source line for providing a voltage for a gate terminal (G) of triac (40) and an overload relay (60) is connected between the power source (10) and the motor (20). The control circuit (50) preferably includes a current detecting circuit (52) for detecting the inrush current and a voltage generating circuit (54) for generating the voltage in response to the detected inrush current. At the startup of motor (20) the control circuit (50) allows triac (40) to turn on by providing the gate terminal (G) with the voltage based on the inrush current. According to this invention, the power consumption of the start winding S after the startup of the motor (20) can be almost zero thus providing low power consumption. In another embodiment not employing a PTC thermistor, a current detecting circuit and a voltage generating circuit are used to control the on and off states of a first triac (90) which in turn controls the on and off states of a second triac (92) connected in series with the start winding.

A motor starter for use with a motor (20) having a main winding (M) and a start winding (S). The starter has a PTC thermistor (30) connected in series with the start winding (S). A triac (40) is connected between PTC thermistor (30) and a power source line. A control circuit (50) is connected to the power source line for providing a voltage for a gate terminal (G) of triac (40) and an overload relay (60) is connected between the power source (10) and the motor (20). The control circuit (50) preferably includes a current detecting circuit (52) for detecting the inrush current and a voltage generating circuit (54) for generating the voltage in response to the detected inrush current. At the startup of motor (20) the control circuit (50) allows triac (40) to turn on by providing the gate terminal (G) with the voltage based on the inrush current. According to this invention, the power consumption of the start winding S after the startup of the motor (20) can be almost zero thus providing low power consumption. In another embodiment not employing a PTC thermistor, a current detecting circuit and a voltage generating circuit are used to control the on and off states of a first triac (90) which in turn controls the on and off states of a second triac (92) connected in series with the start winding.

The invention belongs to the technical field of motor control and power conversion, and particularly relates to a soft starter of a direct-current motor and a soft starting method thereof. The soft starter comprises a current detecting unit, a single chip microcomputer, a liquid-crystal display module, an IGBT (Insulated Gate Bipolar Transistor) driving module and an IGBT module, wherein the current detecting unit comprises a current sensor and an A / D (analog-digital) conversion module; a current signal of a main circuit is processed by the current sensor, converted by the A / D conversion module and then is transmitted into the single chip microcomputer; an output port of the single chip microcomputer is respectively connected with input ports of the liquid-crystal display module and the IGBT driving module; the output port of the IGBT driving module is connected with an input port of a motor armature (M) by the IGBT module; and the IGBT driving module is used for driving the IGBT module and realizing starting operation of the system by state switching of a starting winding. The invention has the advantages that the working under high frequency can be realized, stepless sliding and quick starting are realized, the temperature-rise influence and the power loss are less, the electromagnetic compatibility is good and the interference resistance is strong.

The present invention provides a permanent magnet rotating electrical machine capable of achieving high output. In order to solve this problem, a non-magnetic part is provided at both ends of a pole, and the angle of the minimum magnetic circuit part and the angle of the magnet generated by the non-magnetic part are utilized. The width of these two parameters adjusts the waveform of the induced voltage and the voltage of the motor. Assuming that the pitch in the circumferential direction of the tooth core with respect to the central axis of the rotor is τs (degrees), the circumferential width between the minimum radial width portions of the pair of magnetic circuit parts with respect to the central axis of the rotor is When the opening angle is set to θ (degree), θ(n+Y)×τs (n is an integer above 0), the winding method of the stator winding is distributed winding, let Y=0.5, the winding method of the above stator winding is When concentrated winding, let Y=0.9~1.2. In addition, by dividing the magnet forming one pole into two parts and providing a bridge part therebetween, it is possible to provide a permanent magnet type rotating electrical machine suitable for high-speed rotation.

The invention relates to a protection method for interior failures of a stator winding of a steam turbine generator, belonging to the technical field of main equipment relay protection of a power system. The protection method is characterized by comprising the following steps of: collecting three-phase voltage and three-phase current from the machine end of the generator, filtering fundamental wave negative sequence components of failure components of phase voltage and phase current, calculating the equivalence negative sequence impedance of the failure components of the machine end, and judging whether unsymmetrical failures are interior failures of a motor winding or exterior failures of the machine end according to the symbol and the size of the negative sequence impedance. Analysis for the calculation of all interior short-circuit failures and single-branch welding disconnection failures which possibly occur and the sensitivity in two typical steam turbine generators shows that the negative sequence impedance direction protection method for failure components has superior sensitivity and protection range for the interior asymmetrical failure (particularly a short-circuit failure among interior turns) of the rotor winding of the steam turbine generator to the other traditional protections, and can provide high-quality protection for interior asymmetrical failures of the steam turbine generator, the natural point side of which only leads out three terminals.

The invention is applied to the technical field of a motor structure, and discloses a permanent magnetic vernier motor. The permanent magnetic vernier motor comprises a stator and a rotor rotationally cooperating with the stator, wherein the stator comprises a stator iron core and a stator winding arranged on the stator iron core, the rotor comprises a rotor iron core and a permanent magnet arranged on the rotor iron core, the stator winding comprises a first winding and a second winding, the first winding and the second winding mutually independently run, and the number of pole-pairs of the first winding is greater or smaller than the number of pole-pairs of the second winding. According to the invention, through additional arrangement of one more winding on the basis of a conventional single-stator iron core and a single stator winding , a useful harmonic magnetic field in an air gap is fully utilized, such that under the condition that the motor structure complexity is not increased, the space utilization rate of the motor and the utilization rate of a motor material are effectively improved, the torque and the power grade of the motor are improved accordingly, and the system operation reliability and the fault tolerance operation capability of the motor are effectively enhanced.

The invention relates to operation safety monitoring for a generator stator winding of a large steam turbine generator, and discloses a method to diagnose degradation of an end portion of the generator stator winding in an on-line mode based on synchronous measurement and correlation analysis of electrical quantities and mechanical quantities. The method is high in sensitivity and reliability. According to the method, based on a high sampling rate, vibration quantities of an excitation side and a steam turbine side of the end portion of the generator stator three-phase winding are measured, meanwhile three-phase currents of the generator stator winding are measured, by means of break variable of the stator three-phase currents, failure of a power system and electric impact in operation are identified, the electromechanical characteristic component of the stator winding is calculated and recorded, and sample data obtained when winding amplitudes change along with winding currents are accumulated. By means of comparison between actually measured vibration data and vibration data of equivalent currents in history sample records, and the degradation of the end portion of the generator stator winding is identified. The method can automatically adapt to changes of the generator stator winding currents, diagnoses the degradation of the end portion of the stator winding by means of electric impact of the power system, and has good sensitivity.

The invention provides an electromagnetic under-voltage release comprising a filtering rectifying circuit, a sampling circuit, a power supply circuit, a control module, a driver module and an electromagnet. A direct-current resistance of a starting winding is less than a direct-current resistance of a working winding. According to the electromagnetic under-voltage release and the controlling method thereof, a microcomputer is used for controlling the control circuit, and the controlling thinking is clear and the circuit structure is simplified and ingenious. The starting winding-working winding dual-coil electromagnet is arranged at the circuit, and the direct-current resistance of the starting winding is less than the direct-current resistance of the working winding and the working current of the starting winding is high and the starting torque is large, so that the pull-in performance of the electromagnet can be ensured. And the working current of the working winding is low and thus the basic power for pull-in maintaining of the electromagnet is provided, so that the heating value is extremely low.

A variable speed motor includes first and second main windings wound on a stator, and a relay for performing a switching operation between serial / parallel connections of the first and second main windings to control motor speed. The variable speed motor further includes a tap winding connected in series to the main windings, or an additional capacitor, such that it can greatly extend the range of a variable speed without using a drive unit capable of changing the motor speed at an external location, resulting in reduced production costs of the motor, reduced electromagnetic vibration noise, and reduced power consumption.

The invention provides a switched reluctance motor with torque pulsation inhibited by permanent magnetic flux, belongs to the motor field, and aims to solve the problem of unobvious effect of the prior method for inhibiting the torque pulsation of the switched reluctance motor. In the switched reluctance motor, a stator and a rotor both have a salient-pole structure; two permanent magnets are symmetrically embedded along the radial direction inside the external circle surface of a stator core, and are arranged in stator cores corresponding to stator phase windings in the radial direction; the magnetic flux direction generated by the permanent magnets is in accordance with the magnetic flux direction of excitation generated by a stator winding; and the stator winding generates a magnetic field to cover the permanent magnets. When the stator winding is not electrified, the permanent magnets and the stator core form a loop, and do not generate a torque to the motor rotor. After the stator winding is electrified, the torque generated by the permanent magnets is changed into positive from negative; when the torque generated by the permanent magnets is negative, a torque wave crest is inhibited; and when the torque generated by the permanent magnets is positive, a torque wave trough is compensated, so that the torque pulsation of the switched reluctance motor is effectively inhibited.

An electronic startup device and a method of using it for single phase induction motors, such as those used in hermetic compressors, and permanent capacitor motors may save energy by eliminating energy consumption after the startup period of the motor. The electronic startup device may comprise a circuit including a unidirectional electronic switch which connects a start winding of an induction motor to an alternating voltage source through a thermistor or a solid state pill, which defines the starting time of the motor, and to a full wave rectifier. A timing circuit may activate the unidirectional electronic switch disconnecting the thermistor from the rest of the circuit during an adjustable turning off time.

The present invention provides an internal compensation method of AC motor and its winding coupling method. The capacitor internal compensation uses the capacitor to make the interconnected star stator winding respectively produce its current superposition and phase-shifting action to make the resultant currents of two-to-four winding parts divided from every phase approach to that all the phasesare identical and numerical values are uniform so as to raise the induced potential of stator winding and reduce the loss of reactive current. The interconnected star winding has three compensation ends with two or three winding parts led from three-phase stator winding, and can be coupled into several forms of hexagonal-three-star form, hexagonal-six-star form, interconnected star and variable-electrode 3-V type.

The invention provides a frequency conversion controller of a motor, which comprises a power supply module, an optoelectronic isolation module, a control module and a two-phase three-leg inverter module, wherein the power supply module is connected with the control module, the control module is connected with the two-phase three-leg inverter module, the two-phase three-leg inverter module outputs three phases of power supplies to be connected to an external unidirectional asynchronous motor, the control module is also connected with the optoelectronic isolation module, and the optoelectronic isolation module is provided with a pulse signal input end, a direction signal input end and an enable signal input end. According to the product, the traditional control method of utilizing a silicon controlled rectifier to control the conduction angle and regulating the voltage is replaced by the control method of frequency conversion, the unidirectional asynchronous motor serves as a two-phase motor, and a starting winding serves as a one-phase running winding, the two-phase three-leg SVPWM (space vector pulse width modulation) combined with V / F (voltage / frequency) variable frequency control on the two-phase motor is realized, so that the control over the unidirectional asynchronous motor is perfected, and the requirement that the knitted piece pulling of a flat knitting machine is not influenced by the external power supply is met.

A starting and generating multiplying control system and a method for using the system. The system comprises a motor drive controller, a motor and a magneto-electric change-over switch. The motor comprises a starting winding and a motor assistant winding. Both outputs of the starting winding and the motor assistant winding are connected with the motor drive controller through the magneto-electric change-over switch respectively. When the magneto-electric change-over switch turns on the starting winding and the motor drive controller, the start winding makes the motor started. After exceeding the rated speed, the magneto electric change-over switch turns on the motor assistant winding and the motor drive controller, the motor assistant winding generates motor assistant. And an electromotion mixed dynamic vehicle uses the above system and method.

A variable speed motor includes first and second main windings wound on a stator, and a relay for performing a switching operation between serial / parallel connections of the first and second main windings to control motor speed. The variable speed motor further includes a tap winding connected in series to the main windings, or an additional capacitor, such that it can greatly extend the range of a variable speed without using a drive unit capable of changing the motor speed at an external location, resulting in reduced production costs of the motor, reduced electromagnetic vibration noise, and reduced power consumption.

An electronic relay for single phase induction motor, the electronic relay including a triac located between a start winding and a start capacitor of the single phase induction motor to control current flow of the start winding and an induced voltage detection circuit to detect an induced voltage of the start winding proportional to an angular velocity of the motor. The electronic relay is adapted to detect a zero-point voltage of a motor line voltage before start of the motor and to calculate an acceleration torque during start of the motor. The electronic relay is programmed to turn on the triac when the zero-point voltage of the motor line is detected and to turn off the triac when the acceleration torque begins decreasing.

The invention provides a soft startup device for single-phase motor. Wherein, the motor at least includes a primary winding connected with a startup winding in series, and a running capacitor paralleled with windings. The provided soft startup device comprises: a reactor connected with primary winding in series, and an ac contactor with coil paralleled with the startup winding to work and bypass the reactor when motor rotation speed up to threshold. This invention reduces startup current and time.

The invention discloses a shade pole type single-phase alternating current asynchronous motor with low vibration torque, and particularly relates to a shade pole type composite single-phase alternating current asynchronous motor. The shade pole type single-phase alternating current asynchronous motor with low vibration torque comprises a rear end cover, a rear bearing, a machine seat, a 1# stator core, a 1# rotor core, a 1# stator winding, a 2# stator winding, a 2# stator core, a 2# rotor core, a 2# stator winding, a front end cover, a front bearing, a rotation shaft, a 1# rotor winding, a 2# rotor winding and a phase-shift capacitor. The shade pole type composite single-phase alternating current asynchronous motor enables the vibration torque generated by two sets of shade pole type motors to right differ by an electrical angle of 180 degrees, and achieves the purpose of restraining the vibration torque through mutual compensation of positive and negative components of the vibration torque. If two generated vibration torque amplitude values are the same, the vibration torque is completely restrained. Besides, due to the fact that a branch circuit and a home circuit of a 2# motor with a series capacitor are capacitive, the power factor of the formed composite motor is higher than the power factors of the two original motors.

The invention discloses a method for detecting a turn-to-turn short circuit fault of a stator winding of a generator. The method comprises the following steps: 1) collecting current signals of a three-phase winding of a stator by means of a current transformer, and outputting the current signals to a collector; 2) comparing the current signals of the three-phase winding, and determining a phase where a turn-to-turn short circuit fault of a stator winding is located. In a further improvement of the invention, a method for calculating a short circuit fault degree m using a ratio of three-phase currents Ia1, Ib1 and Ic1 in case of a short circuit fault on the basis of determining the phase where the turn-to-turn short circuit fault of the stator winding is located is also disclosed. The technical solution disclosed by the invention can simply, quickly and reliably determine the turn-to-turn short circuit fault of the stator winding inside the generator, the defects of a traditional diagnosis technology having the main characteristic of rotor vibration are overcome, and the generator is convenient to maintain and repair.

The invention discloses a single-phase switch reluctance multifunctional motor with a starting winding. The single-phase switch reluctance multifunctional motor is a single-phase variable reluctance double-salient pole motor which comprises a stator and a rotor; the salient pole of the stator is provided with an exciting winding; the salient pole of the rotor is provided with the starting windingspecially used for starting; the starting winding is connected with an electric brush; and the current direction of the starting winding and the line of the magnetic force of a magnetic field formed by the exciting winding form a tangency relation. The single-phase switch reluctance multifunctional motor with the starting winding does not need to be assisted by an external force when starting andis convenient to be used.

The present invention discloses a claw pole disc asynchronous electric motor and relates to an electric motor. The claw pole disc asynchronous electric motor comprises a rotor component and a stator component. A claw pole magnetic pole and an axial motor air gap are adopted by the motor. Capacitor phase shifting start is adopted, a fixed rotation direction is set, and a working winding coil and astarting winding coil are shared. The motor has the advantages of simple manufacturing process, low cost and a small number of winding coils of a claw pole motor with a large number of magnetic polesand the advantages of a large electromagnetic torque and a good motor heat dissipation condition of a disk motor, and the motor can be widely applied to small low-rotation-speed electric motors of anelectric valve actuator, a medical instrument and precision transmission.

The invention includes a stator, a rotor, a stator winding, a connecting head and a voltage-frequency controller. According to the motor principle, the stator of the motor is used as the stator of the motor is used as the stator of the motor screw pump and the rotor of the motor is used as the rotor of the motor screw pump, and meanwhile the voltage-frequency controller is used for controlling the working current and frequency of the motor screw pump, so as to regulate the lift and flow of the motor screw pump. Inside the stator there is a rubbe liner and in the middle of the rubbe liner there is a working cavity. The rotor made of the permanent-magnetic material is in the working cavity. At both ends of the stator there are connecting heads. The stator winding fixed on the stator is connected on the power supply after connecting in series with the voltage-frequency controller.

A double excitation invisible brushless synchronous generator contains axial assembling main motor and auxiliary motor, which is characteristic of the main motor rotor piece is invisible convex structure with permanent magnet and excitation winding in groove, excitation winding forms polar hidden magnetic field and permanent magnet forms convex polar magnetic field, stator winding is sine winding with two auxiliary winding of permanent magnetic winding and single harmonic winding, auxiliary motor rotor is a ac exciter with double line formed stator winding and multi-phase winding formed rotor, multi-winding rectifier is connected with excitation winding to form straight line power supply. Said invention is brushless structure.

A variable speed motor includes first and second main windings wound on a stator, and a relay for performing a switching operation between serial / parallel connections of the first and second main windings to control motor speed. The variable speed motor further includes a tap winding connected in series to the main windings, or an additional capacitor, such that it can greatly extend the range ofa variable speed without using a drive unit capable of changing the motor speed at an external location, resulting in reduced production costs of the motor, reduced electromagnetic vibration noise, and reduced power consumption.

The invention discloses a double-coil undervoltage tripper. The double-coil undervoltage tripper comprises an EMC filter circuit, a rectifying circuit, a sampling circuit, a PWM circuit, a first switch circuit, a power supply circuit, a comparing circuit, a bolt circuit, a differentiating circuit, a second switch circuit and a double-coil undervoltage electromagnet, wherein the EMC filter circuit is used for bidirectionally inhibiting interference signals generated by a power grid and an internal circuit; the double-coil undervoltage electromagnet comprises a stabilizing winding, a strong starting winding and a movable iron core. According to the double-coil undervoltage tripper, the reliable pull-in when the voltage of the power grid is higher than 85% of rated voltage is guaranteed, and the reliable tripping when the voltage of the power grid is lower than 50% of the rated voltage is guaranteed; by virtue of relatively high power of the strong starting winding and relatively low power of the stabilizing winding, the high-reliability pull-in can be achieved, and the low-power operation is simultaneously considered, so that the heating of the electromagnet is avoided. Besides, after a power supply circuit of the double-coil undervoltage tripper is connected to the second switch circuit in series, the energy efficiency of the circuit is effectively improved when the integral circuit is adequately simplified.