Motor driver and stator direct current excitation motor system

Abstract

The invention discloses a motor driver and a stator direct current excitation motor system. The motor driver includes a plurality of phase bridge arms and one neutral point bridge arm, wherein one phase bridge arm, the neutral point and one phase winding of the driven motor form a current loop; through control of the conduction direction and the conduction time of the phase bridge arm, the voltage at the winding end being adjacent to the phase bridge arm and the voltage duration time are controlled; through control of the conduction direction and the conduction time of the neutral point bridge arm, the voltage at the winding end being adjacent to the neutral point bridge arm end and the voltage duration time are controlled, so that control of the voltage magnitude and the voltage time at two ends of the winding can be realized and control of the current magnitude and the current direction at two ends of the winding can be realized; and as the neutral point bridge arm is used as a common bridge arm, N-1 bridge arms are reduced and furthermore 4N-4 switch elements are reduced, so that the cost of the driver is greatly reduced and the power density is improved.

Description

technical field [0001] The invention belongs to the field of inverse AC motors and drive control, and more specifically relates to a motor drive device and a stator DC excitation motor system. Background technique [0002] The application of power electronic converters as controllers is the main method of modern electric drives. Permanent magnet motors have the advantages of high power density, high efficiency, and high power factor. However, permanent magnet motors have problems such as high cost of permanent magnets and irreversible demagnetization of excitation. The traditional switched reluctance motor has a simple structure and low cost, but due to its unique power supply method, there is a large current peak at the moment the switch is turned off, so the vibration and noise of the motor are very large. In addition, the torque ripple of the motor Also larger. These shortcomings affect the use of switched reluctance motors in some occasions that require high vibration ...

AI Technical Summary

Problems solved by technology

[0003] In view of the defects of the prior art, the object of the present invention is to provide a motor drive device and a stator DC excitation motor system, aiming at solving the technical problems of large number of switching tubes and low power density used in the existing motor drive device

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