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 slit grooves (2), q-axis squirrel cage grooves (4), independent squirrel cage grooves (6), d-axis squirrel cage grooves (5) and permanent magnets (3), the extension directions of the q-axis squirrel cage grooves (4) and the independent squirrel cage grooves (6) are parallel to the q-axis, and the d-axis squirrel cage grooves (5) extend in the direction parallel to the d-axis or extend in the radial direction of the rotor core (1). According to the rotor assembly provided by the invention, the q-axis magnetic flux can be increased, and meanwhile, the permanent magnet magnetic flux can smoothly enter the stator through the d axis, so that the permanent magnet torque and efficiency of the motor are 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, the end squirrel cage groove (d-axis squirrel cage groove) in this patent is a long arc groove, which hinders The d-axis magnetic flux of the permanent magnet is reduced, and the permanent magnet torque is reduced; in addition, the ends of the magnetic conduction channels between the magnets all extend toward the q-axis, so that the magnetic conduction channels gradually narrow along the extension direction of the q-axis, thus making the stator q-axis Higher saturation reduces the output torque and efficiency of the motor

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