| 摘要 |
PROBLEM TO BE SOLVED: To adjust phase shifts between the rotational phase of a rotating body and the phases of magnetic fields before the rotating body stops, even when the phase shifting occur. SOLUTION: A pulse controller 12 and a motor drive circuit 14 selectively supply a current to each coil of a three-phase motor 16 at prescribed time intervals, based on a preset combination for selectively supplying the current to each coil at a plurality of continuous time intervals for rotating the magnetic field generated from each coil. A detection circuit 20 detects whether a phase shift occurs between the rotational phase of a rotating body which rotates following the rotations of the magnetic fields generated from the coils, when the currents are supplied and the phases of the magnetic fields. When the phase shift is detected, the detection circuit maintains the prescribed time combination, at which the phase shift is detected to a next prescribed time so that the phase shift becomes smaller. |
