| 摘要 |
PURPOSE: To provide an improved method of using a circuit that operates an electric motor by suppressing hiss in an induction motor in which a speed is controlled by varying a frequency, using an inverter and excluding the difficulties of a conventional system. CONSTITUTION: An application voltage is matched to a selected frequency to eliminate hiss produced when operating a motor 17. The voltage is controlled by adjusting an interval between individual pulses that are outputted by a guide unit 4, to the gate of each two MOSFETs 6, 5, 7, 8, 9, and 10 for forming arms 25, 26, and 27 of an inverter 1. |
