| 摘要 |
PURPOSE:To obtain a signal of multipulse per rotation, by providing a rotor frame having an uneven disk part and providing a flux variation detection type index sensor facing the rotor frame and fitted to a bracket. CONSTITUTION:A rotor frame A 4a made of a ferromagnetic material comprises a cylindrical part 32 and a disk part A33. Provided on the circumference of the disk part A33 are a large number of recessed and projected parts 31 for index pulses. An index sensor 30 for generating a signal of multipulse per rotation in accordance with the flux variations is fitted to a bracket 11, facing the parts 31 for the index pulses. The rotor frame 4Aa is made of a ferrous sintered alloy, and the parts 31 for the index pulses are accurately made by a metal mold. |
