| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve smooth steering feeling by attenuating only high-frequency noise while avoiding the enlargement of the device and the speed up and cost up of the CPU, and by preventing the fluctuation of auxiliary steering power when high frequency noise mixes in an electric power steering device. <P>SOLUTION: This electric power steering device is composed of a steering torque detector 20, a brushless motor 10 which is PWM-driven by a three-phase AC motor current, a target current setter 71 which sets a d-axis target current and a q-axis target current, motor current detectors 82 and 83 which detect motor currents, a three-phase dq converter 84, a first deviation calculator 73 which calculates the deviation signal of the q-axis target current, a second deviation calculator 75 which calculates the deviation signal of the d-axis target current, a motor controller 72 which controls the drive of a brushless motor based on the two deviation signals and besides by applying vector control, and an attenuator 86 which attenuates high frequency noise and is provided in a feedback transmission path 84b for a q-axis detected current signal. <P>COPYRIGHT: (C)2003,JPO |
