Inner and outer stator axial magnetic field flux switching type hybrid permanent magnet motor

Abstract

The invention discloses an inner and outer stator axial magnetic field magnetic flux switching type hybrid permanent magnet motor. The permanent magnet motor is of an axial magnetic flux disc type structure; the permanent magnet motor comprises a stator, a rotor and a rotating shaft, wherein the stator and the rotor are coaxially mounted; one end of the rotating shaft is in nested connection with the rotor, the other end of the rotating shaft penetrates through the interior of the stator; the rotor comprises a disc-shaped rotor yoke, the rotor yoke is provided with inner rotor salient poles and outer rotor salient poles, and the inner rotor salient poles and the outer rotor salient poles are uniformly distributed along the circumferential direction; and the angles between the inner rotor salient poles and the outer rotor salient poles are staggered by 45 / n degrees along the radial axis, so that the cogging torque of the motor is reduced, even-order harmonics of the motor are inhibited, wherein n is a positive integer. According to the permanent magnet motor, the inner rotor salient poles and the outer rotor salient poles are staggered by a certain angle, so that the cogging torque of the motor is greatly reduced, the even-order harmonics in the motor are inhibited, the counter electromotive force of the motor is more sinusoidal, and the stable control of the motor is realized.

Description

technical field [0001] The invention relates to the technical field of disc permanent magnet motors, in particular to a hybrid permanent magnet motor of axial magnetic flux switching type with inner and outer stators. Background technique [0002] Compared with traditional electrically excited motors, permanent magnet motors have advantages such as small size, high efficiency, and flexible shape and size. However, due to the permanent magnet structure of the rotor, most permanent magnet motors have the risk of irreversible demagnetization and mechanical instability during high-speed operation. To solve this problem, based on the doubly salient permanent magnet motor, a flux switching permanent magnet motor is proposed. The flux switching permanent magnet motor not only combines the advantages of permanent magnet and stator permanent magnet structure, but also has a relatively sinusoidal bipolar flux linkage, which can improve the back EMF constant and output torque. Althou...

AI Technical Summary

Problems solved by technology

Due to its inherent characteristics, the 6 / 4-pole flux switching permanent magnet motor has even harmonics in the motor flux linkage and back EMF, which increases the difficulty of motor control

At present, to suppress the even-order harmonics of 6 / 4-pole magnetic flux switching permanent magnet motors, axial flux permanent magnet motors with double rotors and single stators or double stators and single rotors are mostly used. This kind of axial distribution of two sets of rotors (stators) way, not only increases the axial direction of the motor, but also increases the difficulty of motor installation

At the same time, existing permanent magnet motors mostly use permanent magnets with high coercive force to increase the power density of the motor, which makes the cost of the motor continue to increase

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