| 摘要 |
PURPOSE:To apply constant voltage to a single phase induction motor regardless of the fluctuation of input power, by detecting voltage applied to windings, and by changing the pulse width of driving pulse according to its detected signal. CONSTITUTION:By a detecting winding 17b wound up in parallel with a main winding 17a, voltage applied to the pain winding 17a is detected. By a pulse signal conversion means 26, according to the detected signal value of the voltage, the pulse width of the signal of output generated from an oscillation means 1 is varied. As the detected signal value of the voltage gets larger, the pulse width is made smaller. By a switching transistor 27, current is conducted to a single phase induction motor 17 during the only period of the pulse width of the pulse signal. |
