| 摘要 |
Since an abnormality is judged by executing a square calculating process with respect to sin theta and cos theta for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which can judge whether the combination of sin theta and cos theta is normal or abnormal, and judges by mapping the combination of the detected sin theta and cos theta, a process can be easily executed, a processing speed is high, and a burden to the CPU can be reduced. Further, an assist can be maintained by controlling a motor by a rectangular wave current by detecting a rotation angle signal at low resolution level, such as Hall sensors arranged around the motor.
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