A Open Winding Motor Driver Topology and Its Modulation Method

Abstract

The invention discloses a topology of an open-winding motor driver and a modulation method thereof, comprising: each bridge arm includes an upper bridge arm power switch device and a lower bridge arm power switch device, and the upper bridge arm power switch device of each bridge arm The upper node is connected to the DC bus voltage, the lower node of the power switching device of the lower bridge arm is connected to the power supply ground, and the lower node of the power switching device of the upper bridge arm is connected to the upper node of the power switching device of the lower bridge arm, as the output node of the bridge arm; The output node of the bridge arm is connected to the left node of the A-phase stator winding of the open-winding motor, the output node of the second bridge arm is connected to the right node of the A-phase stator winding of the open-winding motor and the left node of the B-phase stator winding, and the output of the third bridge arm The node is connected to the right node of the B-phase stator winding of the open-winding motor and the left node of the C-phase stator winding, and the output node of the fourth bridge arm is connected to the right node of the C-phase stator winding of the open-winding motor. The invention improves the power density of the driver and ensures the working performance of the motor.

Description

technical field [0001] The invention belongs to the field of AC motor and drive control, and more specifically relates to a topology of an open-winding motor driver and a modulation method thereof. Background technique [0002] The application of power electronic converters as motor drives is the main method of modern electrical drives. At present, most motors, such as permanent magnet motors, AC asynchronous motors, etc., use three-phase star connection. The reason why most motors use star connection is to suppress the harmonic current in the zero sequence. The three-phase half-bridge inverter topology can naturally suppress the zero sequence current component in structure, so that the motor can achieve better working performance. Therefore, the topology using the three-phase half-bridge inverter topology as a motor driver is very mature and has been commercialized. However, in recent years, more and more new motors have adopted the open-winding wiring method, that is, th...

AI Technical Summary

Problems solved by technology

[0006] For the defects of the prior art, the purpose of the present invention is to solve the existing three-phase full-bridge inverter topology with respect to the three-phase half-bridge topology, the number of driver power devices has doubled, and the corresponding auxiliary devices have also doubled, which greatly Increased cost and size of the drive, technical issues of low power density

Images