A driving circuit and driving method for a permanent magnet synchronous motor

Abstract

The invention discloses a driving circuit and a driving method of a permanent magnet synchronous motor. By sampling the voltage and current information of one phase of the permanent magnet synchronous motor, the back EMF information of the corresponding phase is estimated, and then the back EMF information will be characterized The angle difference between the first voltage signal of the information and the current sampling signal representing the current information is calculated to obtain an angle difference signal, and the angle difference signal is used to adjust the amplitude of the first horseshoe-shaped modulation wave to control the rotation of the rotor The phase of the current coincides with that of the first horseshoe-shaped modulation wave, so that the torque produced per ampere of current is maximized. The invention obtains the counter electromotive force information through estimation, does not need complex coordinate transformation, and has simple algorithm and easy realization. In addition, the present invention changes the phase difference between the back electromotive force of the motor and the phase current by adjusting the current of the motor, so as to realize maximum torque control, and the efficiency of the motor is high.

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

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