Driver topological structure for open-winding motor and modulation method of driver topological structure

Abstract

The invention discloses a driver topological structure of an open-winding motor and a modulation method of the driver topological structure. According to the driver topological structure, each bridgearm comprises an upper bridge arm power switching device and a lower bridge arm power switching device; the upper node of the upper bridge arm power switching device of each bridge arm is connected with a direct-current bus-bar voltage; the lower node of the lower bridge arm power switching device is connected with power source ground; the lower node of the upper bridge arm power switching deviceand the upper node of the lower bridge arm power switching device are connected with each other so as to be adopted as the output node of the bridge arm; the output node of the first bridge arm is connected with the left node of the A-phase stator winding of the open-winding motor, and the output node of the second bridge arm is connected with the right node of the A-phase stator winding of the open-winding motor and the left node of the B-phase stator winding of the open-winding motor; the output node of the third bridge arm is connected with the right node of the B-phase stator winding of the open-winding motor and the left node of the C-phase stator winding of the open-winding motor; and the output node of the fourth bridge arm is connected with the right node of the C-phase stator winding of the open-winding motor. With the driver topological structure for the open-winding motor of the invention adopted, the power density of a driver can be improved, and the working performance ofthe motor can be ensured.

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...

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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

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