43results about How to "High back EMF" patented technology

The invention discloses a magnetic-field-enhanced permanent-magnetic switching flux linkage motor with high fault tolerance. The motor comprises a rotor, a stator, three-phase armature windings and a casing, wherein the casing is made of magnetic conductive material; the rotor consists of toothspace-type core laminations; the stator fixed in the casing comprises first permanent magnets, a first U-shaped iron core, reluctance sheets and a second U-shaped iron core arranged one by one; N poles and S poles of the first permanent magnets are alternately arranged; armature teeth consist of the first permanent magnets and U-shaped iron core edges clinging to two sides of the first permanent magnets respectively; auxiliary teeth consist of the reluctance sheets and the U-shaped iron core edges clinging to two sides of the reluctance sheets respectively; the three-phase armature concentrated windings are wound round the armature teeth; second permanent magnets are arranged between the casing and the stator; and the first permanent magnets and the second permanent magnets in contact with the U-shaped iron cores have the same polarity on contact surface. The motor is simple in structure. Compared with the prior permanent-magnetic switching flux linkage motor, the motor has the advantages of improving anti-electromagnetic interference capability and electromagnetic compatibility and raising the rate of utilizing the permanent magnets, along with higher output power density and capability of avoiding magnetic leakage on the outer edge of the casing.

The invention discloses a stator permanent magnet vernier motor with modules evenly distributed at the circumference. The stator permanent magnet vernier motor comprises an inner stator and an outer rotor. The multiple unit modules which are distributed along the circumference of an air gap are fixed to the outer ring of the inner stator. The side walls of every two adjacent unit modules are tightly attached together. Each unit module is composed of a permanent magnet and a magnetizer which are the same in size, wherein the side wall of the permanent magnet and the side wall of the magnetizer are tightly attached together. The permanent magnets are magnetized in a radial mode. The number P of pole-pairs of magnetic field distribution produced by the permanent magnets corresponds to the number of the unit modules and the number of rotor teeth. The magnetizer in each unit module can be replaced by another identical permanent magnet, and after replacement, the two permanent magnets in the same unit module are opposite in magnetizing direction. Due to the mutual cooperation of the unit modules, the limited notch space, near the stator, of the air gap is reasonably utilized, flux density in a magnetic circuit is increased effectively, counter potential in a winding is effectively improved, output torque and power density of the motor are improved, and the size is reduced correspondingly.

The invention discloses a brushless electric machine rotor sheet of automobile brake system, wherein a peripheral of a rotor sheet utilizes straight lines and arcs to form a salient pole structure. An U-shaped groove is disposed at the rotor sheet. The U-shaped groove is divided into three sections which have the same length. A flux-insulation bridge and a location step are disposed at a joint of the U-shaped groove. The rotor sheet is provided with a location hole for rotor-skewing. A peripheral of the salient pole of the rotor sheet utilizes a structure of straight line and arc, which reduces a content of a counter emf harmonic wave. Optimal designed shape and size of U-shaped magnetic steel groove and the peripheral of the salient pole can expand the range of field-weakening speed expansion of a motor. The motor can provide a certain torque in high speed running and meanwhile magnify the counter emf. A watt density of the motor is improved, and a quality of the motor is reduced. Three sections of the U-shaped groove have the same length, thus the motor only uses one size of magnetic steel, which decreases the cost of the motor. The flux-insulation bridge of the joint of the U-shaped groove also reduces the content of the counter emf harmonic wave. When the rotor is skewing, the skewing location pole is capable of providing a location without a rotor-skewing location frock. The brushless electric machine rotor sheet of automobile brake system is designed properly and is convenient and practical.

An electric vehicle magnetic grid type permanent magnetism doubly salient motor belongs to the electric vehicle motor technology field, comprises a shaft, a front armature iron core, a front armature winding, a front rotor iron core, a front permanent magnet, a permanent magnet iron core, a back permanent magnet, a back rotor iron core, a back armature winding, a back armature iron core and a shell, and is characterized in that the disc-shaped front rotor iron core and back rotor iron core are fixed on the shaft at intervals, the permanent magnet iron core fixed on the shell is between the front rotor iron core and the back rotor iron core, and the permanent magnets are fixed on the two surfaces of the permanent magnet iron core towards the rotor iron cores respectively and uniformly; the front armature iron core and the back armature iron core which are fixed on the shell are at the two sides of the front rotor iron core and the back rotor iron core respectively, armature poles are arranged on the armature iron cores, and the armature windings are wound on the armature poles. The rotor iron cores of the technical scheme of the present invention are magnetic grid-shaped, and are large in contact area and specific power, so that the electric vehicle magnetic grid type permanent magnetism doubly salient motor is very suitable for being used as an electric vehicle motor having higher requirements for the power density.

The invention discloses a radial-axial air gap type three-phase disc type transverse flux permanent magnet motor. Each phase of motor comprises a stator and a radial-axial rotor, wherein the stator iscomposed of a pole-shoe-shaped stator iron core and a pole-shoe-shaped permanent magnet. The permanent magnets are magnetized in the circumferential direction, the magnetization directions of every two adjacent permanent magnets are opposite, and the armature windings are wound in grooves formed after the stator core and the permanent magnets are arranged alternately. The radial-axial rotor comprises radial teeth, axial teeth and a right-angle yoke; the radial teeth and the axial teeth are connected through the right-angle yoke, the adjacent radial teeth are spaced by a 360/n-degree mechanical angle, the adjacent axial teeth are spaced by a 360/n-degree mechanical angle, the radial teeth and the axial teeth under the same pair of poles are spaced by a 180/n-degree mechanical angle, and nis the number of pole pairs of the radial-axial air gap type three-phase disc type transverse flux permanent magnet motor. According to the invention, the pole-shoe-shaped stator core enables the relative area of the axial stator and rotor teeth to be increased, the groove cross section to be increased, and the number of turns of the windings to be increased, thereby increasing the flux linkage, and the radial-axial rotor structure enables the torque density of the motor to be improved.

The invention discloses a high-power permanent magnet direct-drive freight locomotive traction converter, and relates to the field of locomotive traction converters. The converter comprises two groups of independent traction main loops, wherein each group of traction main loops comprises a pre-charging loop, a four-quadrant power module, a four-quadrant chopping power module, an independent intermediate direct-current circuit, a traction inversion power module and a three-pole isolation contactor; the electrical principles and structures of the two traction main loops are completely the same. Each intermediate direct-current circuit comprises an energy storage circuit and a measurement and protection circuit; each energy storage circuit is used for stabilizing the voltage of an intermediate loop, each measurement and protection circuit is composed of a grounding measurement circuit, an intermediate voltage sensor and a voltage detection board, and a three-pole isolation contactor is arranged between the traction inversion power module and a permanent magnet synchronous motor. And each three-pole isolation contactor is connected with a three-phase traction inverter INV2 and a permanent magnet synchronous motor through copper bars. The problem that a traction converter of a high-power freight electric locomotive cannot be directly applied to a permanent magnet direct-drive electric transmission system is solved.

The invention discloses a disc-type built-in aero starter generator, which belongs to the field of aero engineering. The disc-type built-in aero starter generator comprises a high-voltage shaft, a first stator iron core, a rotor iron core, first armature coils and a second stator iron core, and is characterized in that the rotor iron core is fixed on the high-voltage shaft of the aero engine; thefirst stator iron core and the second stator iron core with the same structures are symmetrically located at two axial sides of the rotor iron core and are fixed on the shell of the aero engine; 3k fan-shaped through holes are distributed uniformly on the circumference of the rotor iron core, and k is a positive integer larger than 1; and one side, facing the rotor iron core, of each of the firststator iron core and the second stator iron core is provided with 4k uniformly-distributed fan-shaped convex armature poles, and the armature poles of the first stator iron core are wound with integrated armature coils. The rotor iron core in the invention has small moment of inertia, and high-speed rotation can be achieved; and the rotor iron core is located on the high-voltage shaft of the engine, the rotation speed is high, the power is larger, and the disc-type built-in aero starter generator is extremely suitable for serving as an aero built-in generator.

The invention provides a compressor and an air conditioner. The compressor is used for the air conditioner; the compressor comprises a shell, a plurality of wiring terminals, a stator, a rotor, a pump body, a control circuit, and a microcontroller; the stator is provided with multiple phases of windings; one end of each winding is connected with one corresponding wiring terminal while the other end is connected with another corresponding wiring terminal; one end of the control circuit is connected with the power supply while the other end is connected with the wiring terminals for controlling the power-on condition of the windings; the microcontroller is used for detecting the bus voltage of the control circuit, the voltage drop generated after a current passes through the windings, the intra-line counter electromotive force of the windings and the turnover number of the pump body within unit time in real time, wherein when the compressor is in operation and when the turnover number within unit time is less than a preset turnover number, the microcontroller gives out a first signal to control the control circuit to enable one ends of each phase of the windings to be connected with the power supply and enable the other ends to be connected together so as to realize star-shaped connection of the windings. By virtue of the compressor disclosed in the invention, the operation reliability and adaptivity of the compressor are improved.

The invention discloses a large-current low-voltage servo motor which comprises a machine shell, and an installation space is formed in the machine shell. A stator assembly is included and comprises a stator iron core arranged in the installation space, the inner circumferential surface of the stator iron core is provided with a stator groove for embedding a coil, a coil winding is embedded in the stator groove, and the coil winding is a three-phase coil winding; and a rotor assembly is included and comprises a rotor iron core, the stator iron core sleeves the outer peripheral surface of the rotor iron core, magnetic steel is adsorbed on the outer peripheral surface of the rotor iron core, the magnetic steel is arc-shaped, the magnetic steel is provided with an inner arc surface and an outer arc surface, the inner arc surface and the outer arc surface are eccentrically arranged, the number of the magnetic steel is multiple, and the multiple magnetic steel is distributed according to an N-S polarity alternating sequence. The invention provides a large-current low-voltage servo motor which solves the technical problem that an existing motor is poor in stability during low-speed operation.

The invention discloses a motor stator, a three-phase permanent magnet motor and a compressor. In the present invention, the number n of parallel branches of the stator winding of each phase is determined according to the parameter Ψ, where Ψ=Bt×Wt×Z×L×N×k is set. When Ψ is large, the phase flux linkage can be reduced by setting the value of n, so that the phase flux linkage is within a certain range, so that the back EMF coefficient is also controlled within a certain range, and then the permanent magnet motor can be controlled within a certain range. It has high counter electromotive force at low rotational speed and low counter electromotive force at high rotational speed, ensuring that the motor has excellent performance at both low rotational speed and high rotational speed.

The invention provides a stator core, a stator, a permanent magnet synchronous motor, a compressor and refrigeration equipment. The stator core comprises a plurality of stator punching sheets, the plurality of stator punching sheets are stacked in the axial direction of an inner hole, each stator punching sheet comprises a plurality of stator teeth distributed in the circumferential direction, each stator tooth comprises a tooth part and a tooth boot connected to the tooth part, and the plurality of tooth boots form the inner hole in an enclosing mode; the plurality of stator punching sheets comprise at least one first stator punching sheet, the inner circumferential wall of at least one tooth boot of the first stator punching sheet is provided with a concave part, the tooth boot comprisesa first tooth boot part, and a part of the concave part is located in an area, facing one side of the first tooth boot part, of the symmetric center line of the tooth part. Therefore, radial electromagnetic force waves generated by the interaction of armature magnetic field harmonics and rotor magnetic field harmonics are reduced, the deformation of the stator core is reduced, the vibration noiseof a motor key frequency band is remarkably improved, and the hearing feeling of the compressor is effectively improved.

The invention provides a rotor, a motor, a compressor and refrigeration equipment. The rotor comprises: a rotor iron core, wherein the rotor iron core is provided with a plurality of mounting grooves,the peripheral wall of the rotor iron core is recessed towards the rotation axis direction of the rotor to form a recessed part, and the recessed part is located at one side, deviating from the rotation axis of the rotor, of each mounting groove; permanent magnets arranged in the mounting grooves to form a magnetic pole; and gap grooves which are formed in the rotor iron core, are positioned at the end parts of the mounting grooves, are communicated with the mounting grooves, and protrude towards the d-axis direction to form arching parts. The arching parts are located at one side, deviatingfrom the d axis, of a connecting line between the rotating axis of the rotor and any point on the wall surface of the concave part, the arching parts extend from the gap groove to the d axis direction, in any magnetic pole, a first intersection point is formed between the d axis and the peripheral wall of the rotor core, and the extending direction of the arching part is far away from the first intersection point. The rotor provided by the invention can improve the waveform of an air-gap magnetic field, can effectively reduce the vibration noise of the motor, and improves the noise hearing.