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), in a transverse section perpendicular to a central axis of the rotor core (1), each pole of the rotor core (1) comprises at least two layers of mounting grooves (2) which are arranged at intervals along a radial direction, permanent magnets (3) are arranged in the mounting grooves (2), q-axis squirrel cage grooves (4) are respectively arranged at two ends of the mounting grooves (2), the widths of the q-axis squirrel cage grooves (4) are gradually reduced along a direction close to a q axis, and the lengths of the q-axis squirrel cage grooves (4) are gradually increased in the direction close to the q axis. According to the rotor assembly, the area difference of the squirrel cage grooves can be reduced, the resistance imbalance of the squirrel cage is reduced, and the starting synchronization capability of the motor 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 CN 107834800 A provides a self-starting permanent magnet assisted synchronous reluctance motor without a controller, which reduces the use of permanent magnet materials; but the area of ​​the cast aluminum squirrel cage is small, and the design of the squirrel cage is unreasonable , resulting in unbalanced squirrel cage resistance and poor motor starting synchronization ability

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