| 摘要 |
PURPOSE:To simplify an operation for matching the phase of a permanent magnet provided at a yoke of a rotor of a DC motor with that of a sensor for rotational position detection provided at a motor shaft. CONSTITUTION:A yoke 17 is joined with splines 18 to the outer periphery of a motor shaft 4 in such a manner that it cannot rotate relatively, and a permanent magnet 19 is fitted in a recession 171 formed in the outer periphery of this yoke 17 and is positioned in the direction of the circumference. An engagement groove 301 of a magnet holder 30 provided with a permanent magnet 31 on the outer periphery is fitted on an engagement projection 41 provided at the end part of the motor shaft 4 and a sensor 28 for rotational position detection is positioned at the motor shaft 4. |
