Patents by Inventor Kyooya Sakamoto

Kyooya Sakamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • PWM inverter apparatus
    Patent number: 4691269
    Abstract: This invention relates to a PWM inverter apparatus in which the carrier frequency of the PWM generated voltage is selected to be 8 kHz-16 kHz, and the rotation speed of a motor 9 is controlled so that generated magnetic noise is not audible.Further, a triangular wave oscillating part 11 varying the frequency in response to a signal from a frequency setting part 1 is provided in a control circuit part 2 to control the rotation speed of the motor 9 so that the generated magnetic noise can be limited to the desired value.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: September 1, 1987
    Assignees: Matsushita Electric Industrial Co., Ltd., Matsushita Seiko Co., Ltd.
    Inventors: Shigeki Yamane, Keijiro Mori, Kyooya Sakamoto