US 12,170,381 B2
Motor control for gas engine replacement device
Alexander T. Huber, Menomonee Falls, WI (US); and My Uyen Nguyen, Cambridge, MA (US)
Assigned to Michael Best & Friedrich LLP, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jun. 14, 2021, as Appl. No. 17/346,660.
Claims priority of provisional application 63/040,268, filed on Jun. 17, 2020.
Prior Publication US 2021/0399378 A1, Dec. 23, 2021
Int. Cl. H01M 50/244 (2021.01); F02B 63/02 (2006.01); H01M 50/247 (2021.01); H02J 7/00 (2006.01); H02P 6/06 (2006.01)
CPC H01M 50/244 (2021.01) [H01M 50/247 (2021.01); H02J 7/0045 (2013.01); H02P 6/06 (2013.01); F02B 63/02 (2013.01); H02J 2310/18 (2020.01)] 19 Claims
OG exemplary drawing
 
1. A gas-engine replacement device, comprising:
a housing including a battery receptacle, the battery receptacle configured to removably receive a battery pack;
a motor located within the housing;
a power take-off shaft receiving torque from the motor and protruding from a side of the housing;
a power switching network configured to selectively provide power from the battery pack to the motor; and
an electronic processor connected to the power switching network and configured to:
receive a current measurement associated with the motor,
select a mode threshold based on an operating parameter of the motor, the mode threshold selected to be above a current range where discontinuous conduction occurs for the motor, and
control the power switching network according to one of a freewheeling mode or a synchronous rectification mode based on the current measurement,
wherein control in the freewheeling mode is responsive to the current measurement being less than the mode threshold,
wherein control in the synchronous rectification mode is responsive to the current measurement being greater than the mode threshold.