Inner-outer birotor doubly salient brushless direct current motor

Abstract

The invention discloses an inner-outer birotor doubly salient brushless direct current motor, belonging to a doubly salient brushless direct current motor. The inner-outer birotary doubly salient brushless direct current motor comprises an outer rotor, an inner rotor, a stator and a rotating shaft; the outer rotor, wherein the outer rotor, the inner rotor and the stator share the rotating shaft and are of salient pole structures. The inner-outer birotor doubly salient brushless direct current motor is characterized in that an inward salient pole gear of the outer rotor and an outward salient pole gear of the inner rotor are correspondingly arranged and are respectively provided with 4n salient gears; the outside and the inside of the stator are respectively provided with 6n salient gears, wherein n is a positive integer; the two salient pole gears of the outside and the inside of the stators are staggered with a 60 degrees / 4n mechanical angle; a concentrated armature winding is sleeved on each salient pole gear on the outside of the stator , and the armature windings on the salient pole gears with same phase are connected in series to form a phase; and a concentrated armature winding is also sleeved on each salient pole gear on the inside of the stator, and the armature windings on the salient pole gears with same phase are connected in series to form a phase. The invention has the advantages of firm structure, reliable operation, low manufacturing cost, effectively reduced torque pulsation or voltage pulsation with small exciting power, and high power density.

Description

technical field [0001] The invention relates to a double salient pole brushless direct current motor with inner and outer double rotors, and belongs to the technical field of double salient pole brushless direct current motors. Background technique [0002] The permanent magnet double salient pole motor is a new type of brushless motor proposed by American scholars in the 1990s. It uses high-performance permanent magnets as the magnetic potential source of the motor. With the continuous development of this new type of motor, the magnetic potential source can be changed and combined. Electric excitation doubly salient motor ("doubly salient brushless DC generator", Chinese invention patent: ZL99114250.0) and hybrid excitation doubly salient motor (invention patent application number: 200510038147.0) appeared. [0003] No matter what kind of double salient pole motor, there is no winding on the rotor, no brush, it can be punched and laminated by silicon steel sheet, the stator...

AI Technical Summary

Problems solved by technology

[0004] However, the doubly salient pole motor also has inherent disadvantages: due to the influence of the cogging effect of the salient pole, the torque ripple is relatively large when it is running as a motor; when it is working as a generator, there is also the defect of large output DC voltage ripple, which is extremely important. Limits the application of doubly salient motors in wide speed running state, especially in low speed and high power occasions

Around this problem, scholars at home and abroad have made a lot of efforts: such as using traditional motor chute measures to reduce torque or voltage ripple, which will lead to a significant decrease in the power-to-weight ratio of the motor; it is proposed that a motor contains two identical structures, Double salient motors placed on the left and right (invention patent application number: 200510038148.5), they share the shell and the rotating shaft, and the two rotors or stators are staggered by a certain electrical angle, so that the two parts of torque or potential are superimposed on each other, thereby effectively reducing the output of the entire motor Torque pulsation or voltage pulsation, the axial length of this motor increases significantly, and in high-power applications, the axial cooling channel is long, which is not conducive to the heat dissipation of the motor

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