| 摘要 |
PURPOSE:To detect the error of rotational speed and the error of phase only by the rotational-pulse generating means of one system by generating synchronous pulses different from others only by predetermined numbers in a plurality of rotational pulses generated per one revolution of a motor. CONSTITUTION:When a rotor 1 is turned, currents are generated in an FG coil 3 by a magnet 5 mounted to the rotor 1, and rotational pulses are generated. Since the spaces of an FG coil pattern partially differ, a different waveform having a single period is formed per one revolution of a motor in a rotational pulse shape generated. Accordingly, only one rotational-pulse generating means may be used in order to detect the rotational-speed error and rotational-phase error of the motor, thus allowing miniaturization and lightening and the reduction of cost. |
