Rotating electric machine control system and vehicle drive system including the rotating electric machine control system

Abstract

A rotating electric machine control system comprises a direct-current power supply, a rotating electric machine, an inverter for controlling current flowing through the rotating electric machine and acontrol device for determining the required number of revolutions that is the number of revolutions required for the rotating electric machine and a required torque that is a torque required, whereinthe inverter operates according to the required number of revolutions and the required torque. The rotating electric machine control system further comprises a torque limiting means for limiting thetorque of the rotating electric machine. The torque limiting means changes the mode of torque limiting control, depending on an inverter voltage (Vc) applied to a frequency conversion unit included inthe inverter.

Description

technical field [0001] The present invention relates to a rotating electrical machine control system and a vehicle drive system provided with the rotating electrical machine control system, wherein the rotating electrical machine control system includes a DC power supply, a rotating electrical machine, a power supply interposed between the DC power supply and the rotating electrical machine and convectively flowing through the rotating electrical machine. The current-controlled inverter is further provided with a control device for determining a requested rotation speed as a rotation speed requested by the rotating electrical machine and a requested torque as a requested torque, and the inverter is based on the requested rotation speed and the requested rotation speed determined by the control device. torque work. Background technique [0002] As an example of such a rotating electrical machine control system, the applicant proposed in Patent Document 1 a method of limiting ...

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Problems solved by technology

As a result, fluctuations in the voltage applied to the frequency converter tend to increase, and appropriate torque limitation is required.

However, in the past, the determination of the start of torque limitation and the torque limitation itself were performed only based on means such as the inverter temperature and the temperature of the cooling water for cooling the inverter. Therefore, the same situation as above was caused, and there was room for improvement in this point.

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