Real-time sensorless brushless motor phase change phase correction method based on voltage of neutral points

Abstract

The invention discloses a real-time sensorless brushless motor phase change phase correction method based on the voltage of neutral points. By the adoption of the real-time sensorless brushless motor phase change phase correction method, the phase change position errors of a permanent-magnet brushless motor without a position sensor can be effectively reduced, and the optimum-position phase change is achieved. According to the real-time sensorless brushless motor phase change phase correction method, the voltage differences of neutral points within the 30-degree range on the front side and the 30-degree range on the rear side of a phase change point are collected and calculated so that the current phase error of the phase change can be determined, the voltage differences are used as phase change error feedback quantity, and real-time correction of the permanent-magnet brushless motor is achieved. Experiment results show that no matter whether the load is light or heavy, the phase change phase correction of the permanent-magnet brushless motor without the position sensor can be achieved.

Description

technical field [0001] The invention relates to a sensorless brushless motor commutation phase real-time correction method based on neutral point voltage. Background technique [0002] The permanent magnet brushless motor has the advantages of simple structure, high power density, and easy control. It is the first choice for high-speed motor design. Its control system mostly uses position sensors to detect the rotor position, but the existence of position sensors reduces the reliability of the motor and increases the volume of the motor. And the cost limits the application of this type of motor. In recent years, with the development of position sensorless technology, the application of position sensorless high-speed permanent magnet brushless motors has gradually increased. Among them, the method based on the back electromotive force of the winding is the most mature and commonly used. [0003] The essence of the back electromotive force method is to use the zero-crossing p...

AI Technical Summary

Problems solved by technology

Literature [3] uses the heavy-duty freewheeling process to adjust the phase. The adjustment object is only due to the influence of load changes on the phase. The influence of different angular frequencies on the commutation phase is not mentioned.

Literature [4] uses the terminal voltage difference before and after 120° conduction to perform commutation phase feedback correction, but ignores the influence of winding impedance voltage drop on winding terminal voltage when the load current changes

Images