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.
Claims23
A brushless electric motor comprising:
- a rotor;
- and
- a stator in which the rotor is received, the stator including
- a core defining a plurality of stator teeth,
- an end cap coupled to the core, the end cap including a plurality of guiding tabs,
- a plurality of coils disposed on the respective stator teeth, and
- a plurality of coil contact plates overmolded within the end cap, each of the coil contact plates includes a first terminal and a second terminal;
- wherein the first terminal and the second terminal each include a hook connected to one of the plurality of coils and wherein the hook protrudes from the guiding tab, wherein the first terminal extends in an axial direction of the motor and wherein the hook is radially outward of the first terminal.
A brushless electric motor comprising:
- a rotor;
- and
- a stator in which the rotor is received, the stator including
- a core,
- an end cap coupled to the core,
- a first stator coil coupled to the core,
- a second stator coil coupled to the core,
- a third stator coil coupled to the core, wherein the second stator coil is positioned between the first stator coil and the third stator coil, and
- a first coil contact plate and a second coil contact plate overmolded within the end cap;
- wherein the first coil contact plate short-circuits the first stator coil with the third stator coil, and wherein the second coil contact plate is coupled to the second stator coil,
- wherein the first coil contact plate includes a terminal extending in an axial direction of the motor, wherein the terminal contacts the first stator coil, wherein the hook is radially outward of the first terminal.
A brushless electric motor comprising:
- a rotor;
- and
- a stator in which the rotor is received, the stator including
- a core defining a plurality of stator teeth,
- an end cap proximate an end of the core,
- a plurality of coils disposed on the respective stator teeth, and
- a plurality of coil contact plates overmolded within the 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 and second terminal extend in an axial direction of the motor and wherein the first and second hooks are radially outward of the first and second terminal, respectively.
Dependencies are inferred from the claim text.