Control method and device for dual three-phase asynchronous motors

Abstract

The invention discloses a control method and device for dual three-phase asynchronous motors. The method comprises the following steps of respectively injecting a first high-frequency voltage signal and a second high-frequency voltage signal into a first set of three-phase winding and a second set of three-phase winding which are arranged on stator sides of the dual three-phase asynchronous motors so as to achieve high-frequency injection of a harmonic subspace of the dual three-phase asynchronous motors; acquiring a high-frequency current response in the harmonic subspace; processing to obtain a stator magnetic flux position angle according to the high-frequency current response; and achieving control based on directional stator magnetic flux according to the stator magnetic flux position angle, wherein the first high-frequency voltage signal and the second high-frequency voltage signal are same in amplitude and opposite in phase. With the advantages of non-ideal characteristics of the dual three-phase asynchronous motors and development of various controllable freedom degrees of the dual three-phase asynchronous motors, the running performance of the dual three-phase asynchronous motors under the working conditions of a low speed and an extremely low speed without using a speed sensor is improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a control method and device for a dual-three-phase asynchronous motor. Background technique [0002] In the middle of the 20th century, scholars have carried out theoretical research on multi-phase motors from the perspective of unified motor theory, but limited by the technical level at that time, it was still difficult to achieve effective control of multi-phase motors. With the development of power electronics and other technologies, multi-phase motors have gradually entered the stage of industrial practicality, and have been applied in ship propulsion, multi-electric aircraft, nuclear power plant water circulation systems and other occasions. Polyphase motors offer some significant advantages when compared to conventional three-phase motors. Under low-voltage conditions, multi-phase motors are more likely to achieve high-capacity operation without increasing the current capacity...

AI Technical Summary

Problems solved by technology

The existing high-frequency injection method uses injection in the fundamental wave subspace, and the injection is faced with complex signal extraction work, limitations in applicable rotor slots, and obvious high-frequency torque ripple.

The existence of these problems affects the operation effect of the existing high-frequency injection-based algorithms in low-speed and extremely low-speed areas

Images