Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
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United States of America Patent
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Feb 24, 2004
Grant Date -
Mar 13, 2003
app pub date -
Jul 9, 2001
filing date -
Jul 9, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.
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