Brushless direct-current motor and control for power tool

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United States of America Patent

PATENT NO 9197146
SERIAL NO

13832360

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Brushless direct-current (“BLDC”) motor and control for a power tool. A BLDC motor of a power tool is controlled in either a pulse-width modulation (“PWM”) commutation mode or a centerline commutation mode. When the motor is rotating slowly, the motor is operated using PWM commutation. When the motor is rotating at a speed greater than a threshold speed value, the operation of the motor is transitioned to the centerline commutation mode. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs can each be used for motor speed control. By switching between speed control using the high-side FETs and speed control using the low-side FETs, the heat generated by freewheeling currents can be approximately evenly distributed among the high-side and low-side FETs.

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First Claim

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Patent Owner(s)

  • MILWAUKEE ELECTRIC TOOL CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mergener, Matthew J Germantown, US 116 2294
Wycklendt, Matthew P Delafield, US 21 235

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