US 11,811,293 B2
Power module for a brushless motor in a power tool
Madhur M. Purohit, Towson, MD (US); Michael D. Grove, Windsor, PA (US); and Joel D. Sayles, Perry Hall, MD (US)
Assigned to BLACK & DECKER, INC., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Jan. 13, 2020, as Appl. No. 16/740,834.
Claims priority of provisional application 62/792,643, filed on Jan. 15, 2019.
Prior Publication US 2020/0227975 A1, Jul. 16, 2020
Int. Cl. H02K 7/14 (2006.01); H02K 11/215 (2016.01); H02K 11/33 (2016.01); H02K 9/00 (2006.01); H05K 7/20 (2006.01); H02K 9/22 (2006.01)
CPC H02K 7/14 (2013.01) [H02K 7/145 (2013.01); H02K 9/00 (2013.01); H02K 9/227 (2021.01); H02K 11/215 (2016.01); H02K 11/33 (2016.01); H05K 7/209 (2013.01)] 15 Claims
OG exemplary drawing
 
9. A power tool comprising:
a tool housing;
a brushless DC (BLDC) motor disposed within the tool housing, the BLDC motor including a stator assembly and a rotor assembly rotatably interacting with the stator assembly; and
a power module for driving the BLDC motor, comprising:
a power circuit board having a central through-hole;
a plurality of power switches operatively connected to the BLDC motor disposed on a first surface of the power circuit board around the central through-hole;
a positional sensor board mounted on a second surface of the power circuit board facing the BLDC motor, the positional sensor board having a main body formed around the central through-hole;
a plurality of positional sensors mounted on the positional sensor board facing the BLDC motor; and
a planar heat sink in surface contact with the second surface of the power circuit board.