| 摘要 |
PURPOSE:To stop readily and accurately a rotor at the objective position by rotating a motor providing with a worm mechanism as a speed shifting mechanism, detecting the rotation of the motor by two detectors having phase difference and calculating the rotating amount and position on the basis of the detected signals. CONSTITUTION:A work mechanism is employed (not shown) as a motor speed shifting mechanism. When mode (rotating direction, speed, etc.) signal RIS is applied from a mode setting unit DM, a drive controlling circuit 9 outputs a pulse responsive to the signal to control the switching of a normal rotation triac RT (or reverse rotation element LT), and a motor is rotated. The position and rotating direction of the rotor of the motor are inputted by two detectors 3a, 3b having phase difference and a detecting circuit 8 to a drive controlling circuit 9. The circuit 9 sets the rotating speed at the predetermined value with the signal, and calculates the rotated amount, and stops the rotation of the motor when the rotated amount reaches the predetermined value. |
