| 摘要 |
PURPOSE:To control a rotation without waste by detecting the driving voltage waveform of a motor, detecting a value responsive to the integrated area of its rising and falling parts, and so varying its pulse width as to eliminate its difference. CONSTITUTION:A voltage waveform generated in a winding is different depending upon timing of supplying a drive signal to the winding. If the timing is deviated, the integrated areas of its rising and falling parts. Thus, detection signals responsive to the integrated areas of the rising and falling parts of a voltage waveform generated in the winding are detected by first, second detecting means 5, 6, the signals are compared by comparing means 11, and a control signal responsive to the difference is generated. A switching timing is made optimum by varying the pulse width of the rotary pulse signal for controlling the timing in response to the control signal generated by the means 11 from control means 4. |
