Balancer Sets Patents (Class 323/202)
  • Patent number: 7671556
    Abstract: An image sensing apparatus, which has a constant-voltage driven stepping motor, comprises a PWM waveform generation part that generates pulse signals to be applied to switching devices; and a PWM waveform determination section that determines a PWM waveform to be generated by the PWM waveform generation section. The PWM waveform determination section determines, in accordance with the determined rotation speed value and output torque value of the stepping motor, a duty ratio range that is a range extending from the minimum to the maximum of the duty ratio of the pulse signals. It is designed that the higher the rotational speed value is, the wider the duty ratio width is.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: March 2, 2010
    Assignee: Rohm Co., Ltd.
    Inventor: Makoto Shimada