Controllable flux permanent magnetic synchronous motor of multiple pole number built-in mixed rotor magnetic path structure

Abstract

This invention provides a multiple integral hybrid rotor magnetic circuit structure controlled flux magnet synchronous motor including motor spindle, a stator winding, a stator iron core, AlNiCo magnet, A Nd FeB magent, a rotor iron core, a position sensor, a sensor cable, a motor cable and a converter. The permanent rotor is in an integral hybrid rotor magnetic circuit structure, the magnet in the rotor iron cover is set in U shape, the NdFeB is placed tangentially and the AlNiCo magnet is in radial position characterizing in being called a memory motor since it can apply an amplitude controlled d-axis current vector to change the magnetization intensity of the rotor magnet and remember the changed flux intensity.

Description

technical field [0001] The invention belongs to motor and electric transmission control, in particular to a permanent magnet synchronous motor with multi-pole number built-in hybrid rotor structure magnetic circuit and magnetic flux controllable. Background technique [0002] Generally, in the design of the rotor magnetic circuit and the size determination of the permanent magnets of traditional permanent magnet synchronous motors, it should be considered that the demagnetization of the permanent magnets should be prevented even under the most extreme working conditions. This means that at the maximum operating temperature, the thickness of the permanent magnets in conventional permanent magnet motors is large enough that the demagnetizing magnetomotive force generated by the armature reaction is lower than the coercive force of the permanent magnets. This is because in traditional permanent magnet motors, especially rare earth permanent magnet...

AI Technical Summary

Problems solved by technology

In field-weakening speed regulation, if the total stator current is limited, then the quadrature axis current vector i q The resulting torque that can be utilized will decrease; at the same time, due to the direct axis current vector i d To exist all the time, additional copper loss will be generated in the stator three-phase winding

As for the frequency converter, if the inverter fails and the magnetic field weakening control capability is lost, the permanent magnetic field of the rotor rotating at high speed will induce excessive voltage in the motor winding, which may cause damage to the power device of the frequency converter

In order to solve the above problems, a controllable flux permanent magnet synchronous motor with a built-in hybrid rotor magnetic circuit structure that has been proposed is only effective for motors with a small number of poles, such as four- and six-pole motors. The effect of more motors is not so prominent

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