Patent ID: 7038416

Claim:
A control system for controlling work output delivered to a floor surface by a rotatable work tool, the control system comprising a power source; a motor assembly coupled to the power source and the rotatable work tool, the motor assembly configured to rotatably drive the rotatable work tool; a voltage regulator circuit coupled between the power source and the motor assembly, the voltage regulator circuit configured to provide a selected output voltage to the motor assembly; an electric actuator assembly coupled to the rotatable work tool and configured to adjust contact of the rotatable work tool with the floor surface; a current sensor in communication with the motor assembly, the current sensor configured to monitor a motor current to the motor assembly, said current sensor providing a variable current signal; and a controller circuit in communication with the current sensor so as to receive the variable current signal, the voltage regulator circuit, and the actuator assembly, the controller circuit configured to supply an actuator voltage to the actuator assembly causing the actuator assembly to raise or lower the rotatable work tool relative to the floor surface based on the variable current signal and a desired work output, such that the work output delivered to the floor surface is controlled.