A method for segmental magnetic modulation control of AC magnetic modulation memory motor

Abstract

The invention discloses a segmented magnetic control method of an AC magnetic control memory motor. The segmented magnetic control method comprises the following steps of adding a magnetic control pulse module to a control system so as to achieve on-line regulation of motor flux linkage; selecting n target magnetic states during the running process of the motor, determining intersection points ofa corresponding T-N curve and a motor rotational speed corresponding to each intersection point; and determining the lowest magnetic level during the magnetic control process of the motor according toa relation between Psi<pm> / Ld and i<smax>, and only performing traditional armature current weak magnetism, wherein a permanent-magnet field is not weakened by magnetic control pulse any longer. In order to achieve optimal magnetic control effect, the rotor position at magnetic control initial moment and magnetic control pulse phase are reasonably allocated. Compared with a traditional weak magnetism expansion method, the segmented magnetic control method has the advantages that the direct-axis current component during the running process of the motor can be greatly reduced, the stator copperconsumption of the motor at a high-speed running zone is reduced, frequent on-line magnetic control of the permanent magnet is prevented, and the running efficiency of the motor and the practicability of the control system are improved.

Description

[0001] Field

[0002] The invention relates to an electric transmission control method, in particular to a segmented magnetic modulation control method for an AC magnetic modulation memory motor based on rotor speed / position detection. Background technique

[0003] Modern high-performance permanent magnet synchronous motors (Permanent Magnet Synchronous Machine, PMSM) generally use neodymium iron boron (NdFeB) permanent magnets, which have the advantages of high efficiency, high power density, simple structure, and convenient control. However, the speed regulation range of this kind of permanent magnet motor is limited by the inherent characteristics of the motor such as flux linkage and inductance; moreover, during power generation operation, it is difficult to demagnetize due to a fault, which limits its application range.

[0004] In recent years, a class of motors that can adjust the air gap magnetic field by directly changing the magnetization level of permanent magnets—M...

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