Invention Grant
- Patent Title: Electronic braking of brushless DC motor in a power tool
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Application No.: US15637056Application Date: 2017-06-29
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Publication No.: US10177691B2Publication Date: 2019-01-08
- Inventor: Scott J. Eshleman , Tal Gottesman
- Applicant: Black & Decker Inc.
- Applicant Address: US CT New Britain
- Assignee: Black & Decker Inc.
- Current Assignee: Black & Decker Inc.
- Current Assignee Address: US CT New Britain
- Agent Amir Rohani
- Main IPC: H02P5/48
- IPC: H02P5/48 ; H02P3/12 ; B25F5/00 ; B27B5/38 ; H02P27/08 ; H02P3/22 ; H02P29/024 ; H02K11/26 ; H02K11/33 ; H02K7/14 ; H02P25/22 ; H02P3/14 ; H02P3/08

Abstract:
A power tool is provided including a brushless direct-current (BLDC) electric motor having a stator and a rotor. The power tool includes power switches including high-side switches and low-side switches disposed on a direct-current (DC) bus line between a power supply and the electric motor, and a controller configured to electronically brake the motor by simultaneously closing the high-side switches or the low-side switches to electrically short the stator windings. In an embodiment, the controller is configured to monitor a voltage of the DC bus line, and if the voltage of the DC bus line is lower than a voltage threshold, execute electronic braking by toggling between closing the high-side switches and closing the low-side switches over braking cycles, and if the voltage of the DC bus line is greater than the voltage threshold, execute braking by closing only the high-side switches or the low-side switches over the braking cycles.
Public/Granted literature
- US20180013360A1 ELECTRONIC BRAKING OF BRUSHLESS DC MOTOR IN A POWER TOOL Public/Granted day:2018-01-11
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