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Motor controller for controlling an electric motor

  • US 8,179,060 B2
  • Filed: 05/12/2009
  • Issued: 05/15/2012
  • Est. Priority Date: 05/17/2008
  • Status: Active Grant
First Claim
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1. A motor controller for controlling at least one electric motor, comprising:

  • an operating signal generator for generating an operating control signal for the at least one electric motor;

    a sound signal generator for generating a sound control signal; and

    a mixer connected to said operating signal generator and to said sound signal generator, for superimposing the sound control signal on the operating control signal and to thereby obtain a control signal for controlling the at least one electric motor; and

    a frequency converter connected to receive the control signal from said mixer.

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