Line voltage detection-based doubly salient electro-magnetic motor position-less control method

Abstract

The invention discloses a line voltage detection-based doubly salient electro-magnetic motor position-less control method. The method includes the following steps that: firstly, line voltage U AB, U BC and U CA of a doubly salient electro-magnetic motor is detected; secondly, the value of line voltage difference is calculated according to current conducted phases; and thirdly, phase commutation is performed according to a principle that the line voltage difference abruptly changes and is increased in phase commutation, the value of the line voltage difference is compared with a preset phase commutation threshold value, if the value of the line voltage difference is greater than the threshold value, phase commutation is performed, if the value of the line voltage difference is smaller than or equal to the set threshold value, the current conducted phases are maintained continuously. The line voltage detection-based doubly salient electro-magnetic motor position-less control method of the invention is simple in realization. With the line voltage detection-based doubly salient electro-magnetic motor position-less control method adopted, influence of neutral point voltage fluctuation, on the position-less control algorithm, can be effectively eliminated, and an additional hardware circuit is not required to be additionally adopted.

Description

technical field [0001] The invention relates to a positionless control method for an electrically excited double salient pole motor, belonging to the technical field of motor control. Background technique [0002] As a new type of special motor, electrically excited double salient motor has a structure similar to that of a switched reluctance motor. It has the advantages of simple structure, flexible control, and integration of start-up and power generation, and has attracted widespread attention. The stable operation of electrically excited doubly salient motors requires accurate position information. The installation of Hall sensors in traditional systems not only increases the size and cost of the system, but also greatly limits its application. Therefore, the research on the position sensorless technology of the electrically excited double salient pole motor is of great significance. At present, the research on the position sensorless technology of the electrically excit...

AI Technical Summary

Problems solved by technology

The addition of the filter circuit requires additional hardware circuits, and the filter circuit inevitably produces phase shift effects on position estimation, and the identification process of the optimal coordinate rotation angle is complicated

[0005] Based on the current positionless control of many electric excitation double salient pole motors, there are problems that additional hardware circuits need to be added and the implementation process is complicated. The patent of this invention proposes a positionless control method based on line voltage detection.

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