To eliminate the problem that zeroizing the torque of a DC motor at a stop position causes disturbance due to deformation of a member to transmit the torque of the DC motor, which moves a driven body which is at rest and results in displacement of the driven body from the stop position. 停止位置でDCモータのトルクをゼロにした場合、DCモータのトルクによるを伝達する部材の変形による外乱が発生する。 - 特許庁