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US 2022/0190752 A1Published application
Method of Braking a Power Tool
AssigneeSnap-on Incorporated
InventorsMichael Rajzer, Jason Genz
Life of this patent
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Abstract
A two-stage braking method for a brushless DC (BLDC) motor. The method includes control a switching array to drive the BLDC motor according to a commutation scheme to decrease a speed of the BLDC motor, allow the BLDC motor to coast, determine the speed of the BLDC motor, and actuate high side switches and/or low side switches to substantially stop rotational movement of the BLDC motor.
Claims16
A method of braking a brushless DC (BLDC) motor of a power tool, comprising:
- controlling a switching array to drive the BLDC motor according to a commutation scheme to decrease a speed of the BLDC motor;
- allowing the BLDC motor to coast;
- determining the speed of the BLDC motor;
- and
- actuating high side switching elements or low side switching elements to substantially stop rotational movement of the BLDC motor.
2 more elements
A power tool having a brushless DC (BLDC) motor and a power source comprising:
- a switching array adapted to selectively apply power from the power source to the BLDC motor;
- and
- a controller adapted to:
- control the switching array to drive the BLDC motor according to a commutation scheme to decrease a speed of the BLDC motor;
- allow the BLDC motor to coast;
- determine the speed of the BLDC motor;
- and
- actuate high side switching elements or low side switching elements to substantially stop rotational movement of the BLDC motor.
5 more elements
Dependencies are inferred from the claim text.