Motor rotor and alternating-pole permanent magnet motor

Abstract

The invention provides a motor rotor and an alternating-pole permanent magnet motor. The motor rotor comprises at least two sections of rotor cores, a plurality of permanent magnets, an axial magnetizing ring and a rotating shaft, wherein the at least two sections of rotor cores can be correspondingly assembled along the axial direction; a shaft hole and a plurality of magnetic steel tanks are formed in each section of rotor core; the plurality of magnetic steel tanks are formed along the circumferential direction at intervals; an alternating pole is defined between two adjacent magnetic steeltanks; a first group of axial through holes are correspondingly formed in one side, far away from the shaft hole, of each magnetic steel tank in each rotor core; the plurality of permanent magnets are correspondingly arranged in the plurality of magnetic steel tanks; the magnetic pole directions of the permanent magnets on two adjacent sections of rotor cores are reversely arranged; the axial magnetizing ring is arranged between two adjacent sections of rotor cores; the polarity of a pole surface of the axial magnetizing ring is opposite to that of the outer surfaces of the permanent magnetson the opposite rotor cores; and the at least two sections of rotor cores and the axial magnetizing ring coaxially sleeve the rotating shaft. Through the motor rotor, the torque ripples can be reducedand the probability of magnetic leakage at the end part of the rotating shaft is reduced.

Description

technical field [0001] The invention relates to the field of motors, in particular to a motor rotor and an alternating pole permanent magnet motor. Background technique [0002] In related technologies, the use of alternating pole permanent magnet motors can reduce the amount of magnets and reduce the cost of the motor, but there are still the following defects: [0003] (1) Due to the imbalance between the permanent magnet poles and the alternating poles, there will be large torque fluctuations, which will cause vibration during the operation of the motor. [0004] (2) Due to the unipolar flux leakage at the end of the rotating shaft of the alternating pole permanent magnet motor, the end of the rotating shaft of the motor is magnetized, which adversely affects the reliability and safety of the entire motor system. Contents of the invention [0005] In order to solve at least one of the above technical problems, an object of the present invention is to provide a motor ro...

AI Technical Summary

Problems solved by technology

[0003] (1) Due to the imbalance between the permanent magnet poles and the alternating poles, there will be large torque fluctuations, which will cause vibration during the operation of the motor

[0004] (2) Due to the unipolar magnetic flux leakage at the end of the rotating shaft of the alternating pole permanent magnet motor, the end of the rotating shaft of the motor is magnetized, which adversely affects the reliability and safety of the entire motor system

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