| 摘要 |
PURPOSE:To obtain a smooth rotation at the time of starting by detecting the part to be detected of a code plate secured to a rotor, and obtaining signals responsive to pole positions from detectors to control a driving current at the time of starting synchronously with the pole positions with a simple circuit configuration. CONSTITUTION:After an output signal from a controller 3 by a D/A converter 4 to an analog signal, it is amplified by a current amplifier 5, and a motor 1 is driven by the current. A code plate 6 is secured to the rotor 1 of the motor 1, and a detector 7 for detecting the part to be detected formed on the plate 6 is disposed. An output signal from the detector 7 is input to a rectangular wave forming circuit 8, and a rectangular wave signal output from the circuit 8 is input to the controller 3. |
