| 摘要 |
A plurality of projections (15a), half-projections (16a), and recesses (18a), each having a width equal to an electrical angle of 120 degrees, are formed on the outer peripheral portion of a conductor disk (15) that rotates synchronously with a motor. A coil (10a) that faces only the projections (15a) and a coil (10b) that faces the projections (15a) and the half-projections (16a) are fixed to a stationary armature. Three-phase position detection signals are obtained in accordance with the mode of change in impedances caused when these two coils (10a, 10b) face the outer peripheral portion of the conductor disk (15). <IMAGE> |
