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US 10,848,042 B2Granted
Brushless direct current motor for power tools
AssigneeMilwaukee Electric Tool Corporation
InventorsAndrew T. Beyerl, Keith Boulanger, Matthew R. Bailey, Carl B. Westerby
Life of this patent
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Abstract
A brushless electric motor includes a stator and a rotor. The stator includes a core defining a plurality of stator teeth, a first end cap proximate a first end of the core, a second end cap proximate a second end of the core, and a plurality of coils disposed on the respective stator teeth. The stator also includes a plurality of coil contact plates overmolded within one of the first end cap or the second end cap that short-circuit diagonally opposite coils on the stator.
Claims21
A brushless electric motor comprising:
- a rotor;
- a stator in which the rotor is received, the stator including
- a core defining a plurality of stator teeth,
- a first end cap proximate a first end of the core,
- a plurality of coils disposed on the respective stator teeth, and
- a plurality of coil contact plates overmolded within the first end cap that short-circuit diagonally opposite coils on the stator;
- wherein each of the coil contact plates includes a first terminal and a second terminal diagonally opposite the first terminal;
- wherein the first and second terminals include first and second hooks, respectively, and wherein the first and second hooks are connected to a first coil and a second coil, respectively, of the plurality of coils;
- wherein the first end cap includes a plurality of guiding tabs, and wherein the first and second hooks protrude from the guiding tabs.
6 more elements
A brushless electric motor comprising:
- a power printed circuit board;
- a heat sink coupled to the power printed circuit board;
- a rotor;
- and
- a stator in which the rotor is received, the stator including
- a core defining a plurality of stator teeth,
- a first end cap proximate a first end of the core,
- a plurality of coils disposed on the respective stator teeth, and
- a plurality of coil contact plates overmolded within the first end cap that short-circuit diagonally opposite coils on the stator;
- wherein each of the coil contact plates includes a first terminal and a second terminal diagonally opposite the first terminal;
- and
- wherein the first terminals of the respective coil contact plates extend through the heat sink and are electrically connected to the power printed circuit board.
9 more elements
Dependencies are inferred from the claim text.