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 high-order component of the inductance has a more obvious impact on the performance of the motor. Even if the rotor squirrel cage slot is optimized, the torque ripple component is still large when the motor is in steady state operation, causing motor vibration and noise

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