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Apparatus and method for controlling speed of suction motor in vacuum cleaner

  • US 5,323,483 A
  • Filed: 06/25/1992
  • Issued: 06/21/1994
  • Est. Priority Date: 06/25/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling speed of a suction motor in a vacuum cleaner, comprising:

  • dust detecting means, disposed in a suction port of the vacuum cleaner, for detecting an amount of dust being sucked through said suction port and for outputting electrical output signals corresponding to the detected amount of the dust being sucked;

    waveform shaping means for transforming the output signals from said dust detecting means into rectangular pulses proportional to the amount of dust; and

    speed control means for calculating a duty cycle of the rectangular pulses outputted from the waveform shaping means during a sampling time, for calculating a desired speed value of the suction motor as a constant multiplied by the duty cycle, and for controlling the speed of the suction motor in accordance with the desired speed value.

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