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1. (WO2017040585) POWER TOOL WITH DIGITAL VARIABLE RELUCTANCE MOTOR CONTROL

Pub. No.:    WO/2017/040585    International Application No.:    PCT/US2016/049586
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: B25F 5/00
H02K 19/02
H02P 6/04
H02P 25/08
H02P 25/089
Applicants: JPW INDUSTRIES INC.
Inventors: COLEMAN, Micah A.
Title: POWER TOOL WITH DIGITAL VARIABLE RELUCTANCE MOTOR CONTROL
Abstract:
A power tool includes a control for the motor of the power tool that senses an operating characteristic of the motor and controls the operation of the power tool based on the sensed characteristic. The sensed characteristic includes variations in reluctance of the motor. A controller may sense changes on load on the motor as a result of interaction between a working element such as a saw blade or drill bit and the work piece. The controlled operation may include variation in speed or torque or both, or may include stopping the motor. Emergency conditions may be sensed by changes in reluctance.