Position sensorless control system and control method for permanent magnet synchronous motor with passive control of high frequency signal injection

Abstract

The invention provides a passive-control high-frequency signal-injected permanent magnet synchronous motor positionless sensor control system and a control method and belongs to the motor control field. The system comprises a first coordinate conversion unit, a high frequency response signal separation unit, a PLL speed observer, a soft switch passive rotation speed current regulator, a second coordinate conversion unit and a modulation unit, wherein the first coordinate conversion unit converts a three-phase current of a permanent magnet synchronous motor into a d-axis current and a q-axis current; the high frequency response signal separation unit combines a d-axis current, a q-axis current, and a high-frequency injection voltage signal to generate a high frequency response error signal;the PLL speed observer obtains a motor rotation speed estimation value and a position estimation value; the soft switch passive rotation speed current regulator obtains a d-axis voltage given value and a q-axis voltage given value; the second coordinate conversion unit forms a modulation given voltage; and the modulation unit carries out 3D-SVPWM modulation on a modulation voltage to obtain a duty cycle signal, and the duty cycle signal is sent to a driving circuit to generate a driving waveform. The system and the method have advantages that power density is large; operation reliability is high; and production efficiency is high too.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a control method for a position sensorless control system of a permanent magnet synchronous motor that passively controls high-frequency signal injection. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high power density, small size, high efficiency and power factor. In recent years, with the reduction of the cost of permanent magnet materials and the development of microprocessors and power devices, PMSM transmission systems are widely used in industrial control, servo, automobile, aerospace and medical equipment and other fields. In terms of speed regulation effect, it has a wider speed regulation range and higher precision than permanent magnet brushless motors and asynchronous motors. In terms of control strategy, vector control and direct torque control are relatively mature and mainstream methods at present, which can basically ma...

AI Technical Summary

Problems solved by technology

However, the system complexity of the permanent magnet synchronous motor is very high, due to the nonlinear degree of the mathematical model and the coupling phenomenon of variables such as the magnetic field and the current are very serious, so the PMSM is very high, causing huge troubles for the control

At the same time, the PMSM system is easily affected by the external environment during operation (such as motor body parameter changes, frequent load changes, and grid fluctuations, etc.), and in most cases the motor operating environment is a relatively harsh factory environment. The algorithm-adjusted vector control system is unsatisfactory in the stability and robustness of the permanent magnet motor speed control system. Therefore, the research on the nonlinear control strategy of the permanent magnet motor speed control system has been in a very popular position in recent years. Theoretical and experimental research on nonlinear control of permanent magnet motors is of great significance

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