Rotor assembly and self-starting permanent magnet synchronous reluctance motor

Abstract

The invention provides a rotor assembly and a self-starting permanent magnet synchronous reluctance motor. The rotor assembly comprises a rotor core (1), on the cross section of the rotor core (1), the rotor core (1) is provided with a slit groove (2), q-axis squirrel cage grooves (41) and permanent magnets (3), the q-axis squirrel cage grooves (41) are arranged at the two ends of the slit groove (2), the permanent magnets (3) are arranged in the slit groove (2), at least the permanent magnets (3) located on the innermost layer in the d-axis direction are asymmetrically arranged relative to the d-axis, and the deviation direction of the permanent magnet (3) on the innermost layer relative to the d axis is consistent with the rotation direction of the rotor assembly. According to the rotor assembly, more magnetic flux of the permanent magnets can circulate towards one side of the rotation direction of the rotor assembly, the utilization rate of the permanent magnets is improved, and the motor efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of motors, in particular to a rotor assembly and a self-starting permanent magnet synchronous reluctance motor. Background technique [0002] The self-starting permanent magnet synchronous reluctance motor combines the structural characteristics of the induction motor and the synchronous permanent magnet reluctance motor. The starting torque is generated by the squirrel cage induction, and the constant torque is realized by the difference between the d and q axis magnetic flux of the rotor and the torque generated by the permanent magnet. It can run at high speed and can be directly connected to the power supply to realize the starting operation. The self-starting permanent magnet synchronous reluctance motor can use the reluctance torque to increase the output torque of the motor. Compared with the self-starting permanent magnet motor, the amount of permanent magnets is reduced and the cost is red...

AI Technical Summary

Problems solved by technology

[0003] Traditional permanent magnet motors and permanent magnet synchronous reluctance motors require a driver to start and control the operation, which is costly and complicated to control, and the driver occupies a part of the loss, which reduces the efficiency of the entire motor system

[0004] The Chinese invention patent with the patent publication number CN107994698A provides a self-starting permanent magnet synchronous reluctance motor to reduce the cost of the permanent magnet. However, in this patent, the permanent magnet adopts a long arc structure, so that one end of the permanent magnet opposite to the rotation direction of the rotor is magnetized. The conflict between the flux and the rotor magnetic field leads to a reduction in the utilization of the permanent magnets and a reduction in the efficiency of the motor

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