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Microprocessor for controlling the speed and frequency of a motor shaft in a power tool

  • US 6,696,814 B2
  • Filed: 07/09/2001
  • Issued: 02/24/2004
  • Est. Priority Date: 07/09/2001
  • Status: Expired due to Fees
First Claim
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1. A control system for driving a power tool, comprising:

  • a power source;

    a motor adapted to drive a shaft;

    a power switching unit interconnecting said power source and said motor, said power switching unit applying a pulse width modulated (PWM) drive signal from said power source to said motor; and

    a controller monitoring at least one electrical characteristic of said power source, and adjusting an operating duty cycle of said PWM drive signal based on said electrical characteristic.

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