Driving circuit and method of permanent magnet synchronous motor

Abstract

The invention discloses a driving circuit and method of a permanent magnet synchronous motor (PMSM). The method comprises steps of: estimating the counter-electromotive force information of a certain phase of a PMSM by sampling the voltage information and the current information of the phase; and computing an angle difference between a first voltage signal representing the counter-electromotive force information and a current sampling signal representing the current information in order to obtain an angle difference signal, wherein the angle difference signal is used for adjusting the amplitude of a first horseshoe-shaped modulating wave in order to control the current phase of a rotor to be consistent with the phase of the first horseshoe-shaped modulating wave and further achieve maximum torque per ampere. The method obtains the counter-electromotive force information by estimation, does not require complex coordinate transformation, and is simple in algorithm and easy to implement. In addition, the method changes a phase difference between the counter-electromotive force of the motor and the phase current by adjusting the current of the motor, thereby achieving maximum torque control and high motor efficiency.

Description

technical field [0001] The invention relates to the technical field of motor control, and more specifically, relates to a driving circuit and a driving method of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor (PMSM) has played an important role in daily life, industrial and agricultural production, and national economic development due to its own advantages such as light weight, small size, simple structure, and high power density. Due to the continuous improvement and improvement of the performance of permanent magnet materials and the further development of power electronic devices, the application of permanent magnet synchronous motors is becoming more and more extensive. In some applications, it is hoped to control the cost of the system to the maximum extent. The sensorless technology eliminates conventional position sensors, such as photoelectric encoder discs, resolvers and other equipment, which greatly reduces ...

AI Technical Summary

Problems solved by technology

The traditional control scheme of permanent magnet synchronous motor without position sensor adopts vector control, and the vector control without position sensor can realize better control of permanent magnet synchronous motor, but there are complex algorithms and large amount of calculation, which requires a higher-level processor

Images