PROBLEM TO BE SOLVED: To provide a motor control device capable of suppressing reduction in motor output caused by overheat protection, and to provide an electric power steering device using the same.SOLUTION: A motor control device 13 comprises: motor drive circuits 21a and 21b of a plurality of systems that drive an electric motor 12; and a control device 27 that controls these motor drive circuits of the plurality of systems. The control device, in a case where a temperature rises rapidly compared with a normal time, changes sharing ratios of currents among the respective systems to be supplied to the electric motor from the motor drive circuits of the plurality of systems, detects failures on the basis of a difference in temperature rise rate, and stops the motor drive circuit of the failure system. In addition, by the motor control device, an electric motor for assistance of an electric power steering device is controlled to assist a steering force. When the motor drive circuit of the failure system is stopped, the remaining motor drive circuit drives the electric motor to continue the assistance.SELECTED DRAWING: Figure 2
【課題】過熱保護によるモータ出力の低下を抑制できるモータ制御装置、及びこれを用いた電動パワーステアリング装置を提供する。【解決手段】モータ制御装置13は、電動モータ12を駆動する複数系統のモータ駆動回路21a,21bと、これら複数系統のモータ駆動回路を制御する制御装置27とを備える。制御装置は、正常時に比べて温度上昇が早い場合に、複数系統のモータ駆動回路から電動モータへ供給する各系統間の電流の分担比を変化させ、温度上昇率の差異に基づき故障を検出し、故障した系統のモータ駆動回路を停止させる。また、このモータ制御装置により、電動パワーステアリング装置のアシスト用電動モータを制御して操舵力をアシストする。故障した系統のモータ駆動回路を停止させたときには、残りのモータ駆動回路で電動モータを駆動してアシストを継続する。【選択図】図2
MOTOR CONTROL DEVICE, AND ELECTRIC POWER STEERING DEVICE USING THE SAME
モータ制御装置、及びこれを用いた電動パワーステアリング装置
2016-09-29
Patent
Electronic Resource
Japanese
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