Self-starting permanent magnet synchronous motor rotor adopting conductive sleeve

Abstract

The invention discloses a self-starting permanent magnet synchronous motor rotor adopting a conductive sleeve. The self-starting permanent magnet synchronous motor rotor comprises an iron core, a permanent magnet, a shaft and the conductive sleeve, wherein the conductive sleeve is wrapped at the outer side of the iron core of the rotor to form a rotor starting winding; and the conductive sleeve is made of a non-magnetic good conductor material. Compared with the prior art, the self-starting permanent magnet synchronous motor rotor has the beneficial effects: 1, the equivalent air gap length of a motor is increased by means of the conductive sleeve, and the influence of magnetomotive force of stator current demagnetization on the permanent magnet is weakened; 2, the resistance of the conductive sleeve is lower and the equivalent winding of the rotor is enhanced; 3, the air gap length of the motor is increased by means of the conductive sleeve, and internal eddy-current loss and stray loss of the motor are favorably reduced; 4, the mechanical strength of the rotor can be enhanced by means of the conductive sleeve, a magnetic isolation bridge inside the rotor can be made to be narrower, and high enough utilization rate of the permanent magnet is ensured; and 5, the torque pulsation caused by slotting on the surface of the rotor during steady-state running is reduced, and vibration and noise of the motor are restricted.

Description

technical field [0001] The invention relates to a self-starting permanent magnet synchronous motor rotor using a conductive sleeve. Background technique [0002] In recent years, self-starting permanent magnet synchronous motors have attracted more and more attention. Compared with asynchronous motors, they have higher efficiency and power factor, and a wider range of economical operation. They are expected to replace asynchronous motors in many industrial applications, but the reliability of permanent magnets has always been a An important factor hindering the widespread application of this motor. Such as figure 1 Shown is an existing 4-pole inline permanent magnet structure motor rotor, which includes an iron core 1, a permanent magnet 2, a squirrel cage winding 3 and a shaft 4. Generally speaking, for self-starting permanent magnet synchronous motors, the squirrel-cage winding has little influence on the steady-state performance of the motor. However, the existence of ...

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Problems solved by technology

However, the existence of the rotor squirrel cage not only affects the distribution of the air-gap magnetic field, resulting in a large high-order harmonic component of the back EMF of the motor, but also affects the inductance parameters of the motor, so that the ...

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