Compact drive system and drive method for open-winding permanent magnet synchronous motor

Abstract

The invention discloses a compact drive system and drive method for an open-winding permanent magnet synchronous motor. Middle points of a first bridge arm, a second bridge arm and a third bridge arm of a four-bridge arm compact converter are connected to left-end windings A, B and C of the open-winding permanent magnet synchronous motor respectively; the first bridge arm, the second bridge arm and the third bridge arm form a left three-phase power output end; the middle point of the fourth bridge arm is connected with a right-end winding A' of the open-winding permanent magnet synchronous motor; the right-end windings B' and C' are connected with the left-end windings A and B; the first bridge arm, the second bridge arm and the fourth bridge arm form a right three-phase power output end; a current signal collection module collects a current signal of the open-winding permanent magnet synchronous motor; a position signal collection module collects a voltage signal of the open-winding permanent magnet synchronous motor; a current signal and a voltage signal are transmitted to a controller to achieve rotating speed current double closed-loop control; and a drive module outputs a PWM signal to achieve control on the four-bridge arm compact converter. The system is low in cost and good in speed control performance. The invention further discloses a compact drive method for the open-winding permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to the field of motor systems and controls, in particular to an open-winding permanent magnet synchronous motor drive system based on a four-bridge arm compact converter and a drive method thereof. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density, simple structure, high efficiency, and good reliability. They have broad application prospects in new electric traction technologies represented by electric vehicles, ship electric propulsion, and high-speed railways. However, the traditional permanent magnet synchronous motor speed control system cannot realize the wide speed range operation of the motor. In order to solve this problem, the neutral point of the traditional three-phase AC motor is opened to form a double-port winding open structure motor. In this case, only the connection mode of the motor stator winding is changed, and the magnetic circuit and structure of the ...

AI Technical Summary

Problems solved by technology

With the increase of the number of levels, the open-winding structure permanent magnet synchronous motor combined with the corresponding power converter can form a drive system with excellent characteristics. Although the level inverter topology can well realize the drive control function, the converter topology with more than 12 switching devices greatly increases the cost of the drive system, and the complexity of the control system is also high. Winding permanent magnet synchronous motor drive system, the study of its simplified converter topology and its control technology has become an important way to promote its application field

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