Permanent magnet motor rotor structure

Abstract

The invention discloses a permanent magnet motor rotor structure. The structure comprises a rotor iron core, an outer edge of the rotor iron core is formed by connecting 2p same curved surfaces alonga peripheral direction of a rotor iron core; the curved surfaces are formed by orderly connecting multiple sections of arc parts or multiple sections of arc parts and multiple sections of line segments along the peripheral direction of the rotor iron core in a symmetric way, wherein p is positive integer greater than or equal to 1; the structure has the advantage that more adjusting variables canbe utilized to precisely optimize the waveform of the air-gap magnetic flux density, so that the waveform of the air-gap magnetic flux density approaches to sine wave, the cogging torque and ripple wave torque can be greatly weakened, the electromagnetic vibration noise of the permanent magnetic motor is reduced, and the stray loss of the permanent magnetic motor can be reduced, and the torque density and the running efficiency of the permanent magnetic motor are improved.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a permanent magnet motor rotor structure. Background technique [0002] With the further application of built-in magnet steel permanent magnet motors in industrial control and other fields, more performance indicators such as cogging torque, ripple torque, torque density, vibration and noise, and dynamic response of this type of permanent magnet motors have been proposed. for demanding requirements. Due to the principle characteristics of the permanent magnet motor, it has a cogging torque and a larger ripple torque that do not exist in the induction motor, but this will bring a decrease in positioning accuracy, excessive vibration and noise, and poor operating efficiency issues such as decline. Generally speaking, the root cause of the above problems is the harmonic component in the air gap flux density of the permanent magnet motor. For the AC permanent magnet motor, the harmonic c...

AI Technical Summary

Problems solved by technology

However, it cannot effectively weaken the low-order harmonics in the air-gap flux density, and the stator harmonic loss is still relatively large

[0007] The invention patent "A Skewed Rotor Structure of Permanent Magnet Synchronous Motor" (Notice No.: CN102916512A) announced by China proposes a slanted rotor structure to weaken the cogging torque, and the magnetic steel is unevenly distributed along the circumference of the rotor. But this will make the air gap magnetic field distribution uneven, resulting in greater electromagnetic vibration noise

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