US 11,833,655 B2
Sensorless motor control for a power tool
Timothy R. Obermann, Waukesha, WI (US); Douglas R. Fieldbinder, Greendale, WI (US); and Alexander Huber, Menomonee Falls, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Apr. 19, 2022, as Appl. No. 17/724,202.
Application 17/724,202 is a continuation of application No. 17/054,913, granted, now 11,305,412, previously published as PCT/US2020/028251, filed on Apr. 15, 2020.
Claims priority of provisional application 62/833,834, filed on Apr. 15, 2019.
Prior Publication US 2022/0241951 A1, Aug. 4, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02P 1/46 (2006.01); B25F 5/00 (2006.01); H02K 11/27 (2016.01); H02P 21/18 (2016.01); H02K 21/16 (2006.01); H02P 6/182 (2016.01)
CPC B25F 5/00 (2013.01) [H02K 11/27 (2016.01); H02K 21/16 (2013.01); H02P 6/182 (2013.01); H02P 21/18 (2016.02); H02P 2203/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for automatic control switching for driving a sensorless motor of a power tool, the method comprising:
determining, using a motor controller, a first load point based on a user input;
determining, using the motor controller, a first motor control technique corresponding to the first load point;
driving the sensorless motor based on the first motor control technique;
determining, using the motor controller, a change from the first load point to a second load point, wherein the first load point and the second load point are determined based on a speed application and a torque application selected by the user input;
determining, using the motor controller, a second motor control technique corresponding to the second load point; and
driving the sensorless motor based on the second motor control technique.