A high-speed positionless control strategy for three-phase electrically excited doubly salient pole motors based on non-conducting phase-terminal voltage coordinate transformation

Abstract

The invention discloses a three-phase electro-magnetic double-salient-pole motor high-speed sensorless control strategy based on non-communicating phase terminal voltage coordinate transformation. The strategy includes: respectively detecting three-phase terminal voltage according to the feature that a three-phase electro-magnetic double-salient-pole motor has a zero crossing point in non-communicating reverse potential in an electric cycle, allowing the voltage to enter a digital controller to perform rotary coordinate transformation, consistent with the phase order of motor rotation, on the current upper tube communicating phase terminal voltage after the voltage is filtered by an RC filter, obtaining the rotary angle alpha ranging from 30 degrees to 60 degrees according to different rotation speeds, and judging the phase change points by detecting the zero crossing points of the current upper tube communicating phase terminal voltage after coordinate transformation. By the strategy, the defect that the reverse potential cannot be detected directly during high-speed operation is overcome, weight and size of the filter can be reduced, and the electro-magnetic features and mathematical models of the motor need not be known in advance. In addition, the strategy is applicable to three different chopping manners, and easy to implement.

Description

technical field [0001] The invention relates to a position sensorless control method for an electric excitation double salient motor, belonging to the technical field of electric excitation double salient motor control. Background technique [0002] Position sensorless technology has always been a hot issue in the research of switched reluctance motors, and has received extensive attention from domestic and foreign research institutions and industrial enterprises. The research on high-speed position sensorless technology is mainly to use other characteristic quantities of the motor to accurately obtain the commutation point under the condition that the back EMF is not easy to be collected directly. It improves the reliability of the motor system and lays the foundation for the application of the motor in harsh occasions where the position sensor is easily disturbed. [0003] Electric excitation double salient motor combines the advantages of permanent magnet motor and switc...

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Problems solved by technology

[0009] Based on the traditional back EMF method, combined with the electromagnetic characteristics of the electric excitation double salient motor, the present invention proposes a novel electric excitation double salient motor high-speed operation sensorless control based on the coordinate transformation of the non-conducting phase terminal voltage The problem to be solved by this method is: to overcome the weakness of the large weight and volume of the filter during high-speed operation, to overcome the disadvantages of being unable to detect the inductance characteristics of each phase at the same time, and to directly detect the back EMF and line EMF during high-speed operation, and obtain a suitable The simple and easy-to-implement position sensorless control strategy under the three chopping modes lays the foundation for the high-speed and stable operation of the electric excitation double salient pole motor

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