Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
AssigneeTyco Electronics Corporation
InventorsJeffery L. Henderson, Hong Moon, Mark Wardrup, Ivan Reede
Life of this patent
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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.
Claims41
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.
A power tool comprising:
- a chuck holding a tool;
- a motor driving said chuck;
- a power source;
- 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.
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 drive signal from said power source to said motor;
- and
- a controller monitoring at least one electrical characteristic of said power source and said power switching unit and adjusting an operating frequency of said drive signal to enter a ratchet mode based on monitored electrical characteristics of said power source and power switching unit.
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 drive signal from said power source to said motor;
- and
- a controller monitoring at least one electrical characteristic of said power source, and adjusting a frequency of said drive signal based on said electrical characteristic of said power source.
Dependencies are inferred from the claim text.