Abstract: A vacuum cleaner that includes a surface cleaning head including a dirty air inlet, a brush supported by the surface cleaning head, a motor coupled to and operable to cause movement of the brush, a sensor to sense a voltage associated with a current of the motor, and a controller configured to control an amount of current provided to the motor in response to the sensed voltage. The controller is configured to control a first pulse width modulated (PWM) duty cycle provided to the motor when the sensed voltage is less than a reference voltage, control a second PWM duty cycle provided to the motor when the sensed voltage is greater than the reference voltage, the second PWM duty cycle being less than the first PWM duty cycle, and turn off the motor when the sensed voltage increases to a voltage associated with an overload current of the motor.

Abstract: A vacuum cleaner having a surface cleaning head and a brush supported by the surface cleaning head. A control circuit operates the vacuum cleaner. The control circuit includes a motor coupled to and operable to cause movement of the brush. Also disclosed is a method of controlling a motor for a brush of a vacuum cleaner. The method includes sensing an electrical parameter related to an amount of carpet load restricting the brush and determining a pulse width modulated duty cycle value based on the electrical parameter.

Abstract: A vacuum cleaner having a surface cleaning head and a brush supported by the surface cleaning head. A control circuit operates the vacuum cleaner. The control circuit includes a motor coupled to and operable to cause movement of the brush. Also disclosed is a method of controlling a motor for a brush of a vacuum cleaner. The method includes sensing an electrical parameter related to an amount of carpet load restricting the brush and determining a pulse width modulated duty cycle value based on the electrical parameter.