| 摘要 |
PURPOSE:To provide a control system which can maintain the rotating speed of a brushless motor at a set speed by accurately feeding back the rotating speed of the brushless motor to a microcomputer. CONSTITUTION:Either rotation detecting pulses Pd from rotation detecting sensors 30 to a logic controller 40, or coil selecting pulses from the controller 40 to drive circuits 20 are fed back to a microcomputer 10. The microcomputer 10 calculates the rotating speed of a brushless motor on the basis of the pulses and decides the duty ratio of the electric current supplied to a coil so that the calculated rotating speed can coincide with a set speed. |
