A four-phase dual-winding vernier motor

Abstract

The invention discloses a four-phase double-winding vernier motor comprising a V-shaped permanent magnet rotor 1, an air gap 13 and a slotted stator 6 which are arranged coaxially, wherein an air gap13 is arranged between the rotor 1 and the stator 6. The two permanent magnets 2 in the rotor 1 form a pair of poles and are arranged in a V-shape, one side is closed, and two feet of the other side are respectively arranged on different rotor dummy slots. The number of rotor false slots 4 is consistent with the number of permanent magnets 2. The stator 6 comprises a stator choke 14 coaxial with the rotor 1, a plurality of claw-shaped stator teeth 10 protruding from the outer periphery of the stator choke, the stator teeth adjacent to each other are provided with an inner slot 12 of the statorteeth, an outer slot 11 of the stator teeth is provided between the claw-shaped teeth, and the stator 6 further comprises a four-phase modulation armature winding 7 embedded in the inner slot of thestator teeth and a four-phase conventional armature winding 5 embedded in the outer slot of the stator teeth. The invention can reduce the positioning torque and torque ripple of the motor, reduce theinternal magnetic flux leakage, improve the utilization ratio of the permanent magnet, and improve the power density and the torque density of the motor.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and particularly refers to a vernier motor suitable for electric vehicles and the like that needs relatively high power density, high torque density, high efficiency, and low torque ripple. Background technique [0002] Because of its simple and compact structure, high power density and high efficiency, the vernier motor has been developed rapidly in recent decades. In low-speed and high-torque applications, due to the structure in which the motor rotor is directly connected to the hub, torque direct drive can be effectively realized. At the same time, such a structure eliminates traditional mechanical components, which is beneficial to release the compact space of the energy transmission system and reduce the weight of the vehicle. At the same time, it can also eliminate the noise and failure caused by gear meshing transmission, thereby improving the efficiency and reliability of th...

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent No. 201210163826.0 proposes a magnetic field self-increasing permanent magnet vernier motor. The rotor of the motor is arranged with permanent magnets embedded in spokes, and adjacent permanent magnets are magnetized alternately and reversely along the tangential direction. The permanent magnet arrangement can produce At the same time, the arrangement of the embedded permanent magnets in the spokes can also make the permanent magnets bear compressive stress when the rotor rotates, avoid damage and fall off, and can improve the overall mechanical strength of the rotor; but this arrangement of the embedded permanent magnets in the spokes makes the There is a large external magnetic flux leakage in the motor, which leads to a decrease in the utilization rate of the permanent magnet of the motor and a decrease in the torque density. On the other hand, the internal magnetic flux leakage makes the motor have a high positioning torque and torque ripple.

[0005] Chinese Patent No. 201710100273.7 proposes a double-claw pole stator magnetism-concentrating vernier motor. By setting double stators, three-phase four-pole windings are embedded in the grooves of the inner and outer stators to achieve the purpose of magnetism concentration. Flux leakage is reduced, which improves the utilization rate of permanent magnets, but the stator adopts a slotted structure so that the utilization rate of the stator space of the motor is not high

On the other hand, the arrangement of the permanent magnets embedded in the spokes makes the motor have relatively large detent torque and torque ripple. At the same time, the motor has two layers of air gaps due to the double stator structure, so that the power density and torque of the motor Density drops,

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