在收纳于马达壳体(11A)内的转子(44)的旋转轴(45)的与输出侧相反的相反侧设置构成位置检测传感器的位置检测用永磁体(51),进一步地,在设有位置检测用永磁体(51)的一侧的马达盖(48)设置构成位置检测传感器的GMR元件(56)和其位置检测电路,并且将GMR元件
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