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Surface cleaning appliance

  • US 9,801,516 B2
  • Filed: 06/13/2014
  • Issued: 10/31/2017
  • Est. Priority Date: 06/13/2013
  • Status: Active Grant
First Claim
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1. A surface cleaning appliance comprising:

  • a cleaner head comprising an agitator and a motor for driving the agitator;

    a switch coupling the motor to a supply voltage;

    a voltage sensor for measuring the magnitude of the supply voltage;

    a current sensor for measuring the magnitude of current through the motor; and

    a controller configured to output a PWM signal for controlling the switch,wherein the controller adjusts the duty cycle of the PWM signal in response to changes in the supply voltage and in response to changes in the current through the motor.

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