Five-bridge arm converter-based open winding permanent magnet synchronous motor driving system and method

Abstract

The present invention discloses a five-bridge arm converter-based open winding permanent magnet synchronous motor driving system and method. A five-bridge arm converter comprises a six-switch three-phase converter and a four-switch single-phase converter which are connected in parallel, the output end of the six-switch three-phase converter is connected with the left-end windings A,B and C of an open winding permanent magnet synchronous motor, the output end of the four-switch single-phase converter is connected with the right-end windings A' and C', and a right-end winding B' is connected with a left-end winding A. A current signal acquisition module is used to acquire a current signal of the open winding permanent magnet synchronous motor, a position signal acquisition module is used to acquire a voltage signal of the open winding permanent magnet synchronous motor, and the above current and voltage signals are both sent to a controller, thereby realizing the rotating speed current double closed loop control. A driving module outputs a PWM signal, thereby controlling the five-bridge arm converter. The system is low in cost and good in speed regulation performance. The present invention also discloses a five-bridge arm converter-based open winding permanent magnet synchronous motor driving method.

Description

technical field [0001] The invention belongs to the field of motor system and control, and in particular relates to a converter topology structure and a control method of an open-winding permanent magnet synchronous motor drive system. Background technique [0002] The open-winding structure motor opens the neutral point of the traditional three-phase AC motor to form an open winding structure with two ports. The magnetic circuit and structure of the motor do not change. The open-winding structure motor does not change the basic performance of the traditional motor, and After the neutral point is opened, the constraint relationship between the traditional motor windings of each phase no longer exists, and the windings of each phase are independent, which can improve the reliability of the motor body to a certain extent, and its two ports can be connected to the converter respectively. The port converters can coordinate and control each converter to bear half of the power, an...

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Problems solved by technology

At present, the permanent magnet synchronous motor is the first choice for the motor drive system with high power density, high efficiency, and high performance. The open-winding structure permanent magnet synchronous motor combined with the corresponding power converter can constitute a drive system with excellent characteristics. However, the existing The dual-inverter and its derivative multi-level inverter topology suitable for motors with open-winding structure, although the drive control function can be well realized, but the converter topology with more than 12 switching devices greatly increases the drive system. cost, and the complexity of the control system is relatively high, so for the open-winding permanent magnet synchronous motor drive system, research on a simplified converter topology and its control technology has become an important way to promote its application field

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