A segmented oblique pole rotor and its motor

Abstract

The invention provides a segmented inclined-pole rotor and a motor. According to the key technology of the segmented inclined-pole rotor, the motor is divided into two segments of rotor segments which are the same in length in the axial direction of the rotor; the included angle between the first rotor segment and the second rotor segment in the circumferential direction is a mechanical angle of alpha1=beta*180 / LCM(Z1, 2p); beta is the segmented tilt ratio; beta is greater than or equal to 0.4 and smaller than or equal to 0.53; the segmented inclined-pole rotor is of a surface-mounted permanent magnet rotor structure, a tile structure is adopted by a permanent magnet of the segmented inclined-pole rotor, the section surface of the segmented inclined-pole rotor is in a tile form and the segmented inclined-pole rotor comprises four edges in all, namely two straight edges L1 and L2 and two arc edges; the radiuses of two arcs are R1 and R2 respectively and R2 is greater than R1; the permanent magnet is thick in the middle part and thin in two edges and the maximal thickness is h; the number of slots per pole and per phase of the motor is 1; and the pole arc angles of the segments are the same and are greater than or equal to an electrical angle of pi-pip / LCM(Z1, 2p). According to the segmented inclined-pole rotor, the tilt angle is smaller than a traditional recommended value and the tilt angle and optimization of cogging torque are simultaneously considered.

Description

technical field [0001] The invention relates to the technical field of surface-type permanent magnet rotors of permanent magnet motors, in particular to a segmented oblique pole rotor and a motor thereof. Background technique [0002] Generally, the permanent magnet motor can weaken the cogging torque and improve the sinusoidal nature of the magnetic field and the back electromotive force through the stator skew or the rotor skew pole. However, whether the stator skew or the rotor pole is inclined at a certain angle (continuous skew), Both will increase the complexity of the mass production of the motor and the manufacturing cost of the motor. The motor rotor such as Figure 1a shown. Therefore, the segmented skew pole of the rotor has attracted much attention because of its simple manufacture and low cost. [0003] In order to effectively weaken the cogging torque and back EMF harmonics, usually according to the formula Obtain the optimal tilt angle for segmented oblique...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that due to the excessively large pole arc angle, the overlap of axially opposite magnetic poles will affect the output power, the present invention provides a segmented oblique pole rotor and its motor, which can effectively reduce the optimal segmented oblique pole angle and simultaneously obtain low cogging torque

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