Stator assembly for a brushless motor in a power tool
First Claim
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1. A power tool comprising:
- a housing;
a motor housed inside the housing, the motor having a stator assembly and a rotor rotatably arranged inside the stator, the stator assembly comprising;
a lamination stack defining a plurality of poles and having an outer surface that is substantially cylindrical and extends in a longitudinal direction of the motor;
a plurality of magnet wires, each magnet wire including two end portions and two winding portions located between the two end portions and wound on two opposite poles of said plurality of poles; and
a bus bar comprising;
a non-conductive mount arranged on the outer surface of the lamination stack, and a plurality of conductive terminals to provide electric power from a power source to the plurality of magnet wires, each conductive terminal including a main portion mounted on the non-conductive mount so the main portion of each conductive terminal extends in the longitudinal direction of the motor substantially parallel to the outer surface of the lamination stack with the non-conductive mount located between the main portions of the plurality of terminals and the outer surface of the lamination stack, each conductive terminal further including a tang portion arranged at a longitudinal end of the main portion and folded over the main portion forming an acute angle with respect to the main portion, wherein at least one of the two end portions of each of the plurality of magnet wires is wrapped around and electrically connected to the tang portion of one of the plurality of conductive terminals.
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Abstract
A power tool includes a motor having a stator assembly and a rotor pivotably arranged inside the stator. The stator assembly includes a lamination stack defining a plurality of poles; a plurality of field windings each arranged at at least two opposite poles of said plurality of poles and connected together around the stator assembly; and a plurality of conductive terminals longitudinally arranged along an outer surface of the lamination stack and electrically coupled to the plurality of field windings and a power source.
75 Citations
19 Claims
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1. A power tool comprising:
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a housing; a motor housed inside the housing, the motor having a stator assembly and a rotor rotatably arranged inside the stator, the stator assembly comprising; a lamination stack defining a plurality of poles and having an outer surface that is substantially cylindrical and extends in a longitudinal direction of the motor; a plurality of magnet wires, each magnet wire including two end portions and two winding portions located between the two end portions and wound on two opposite poles of said plurality of poles; and a bus bar comprising;
a non-conductive mount arranged on the outer surface of the lamination stack, and a plurality of conductive terminals to provide electric power from a power source to the plurality of magnet wires, each conductive terminal including a main portion mounted on the non-conductive mount so the main portion of each conductive terminal extends in the longitudinal direction of the motor substantially parallel to the outer surface of the lamination stack with the non-conductive mount located between the main portions of the plurality of terminals and the outer surface of the lamination stack, each conductive terminal further including a tang portion arranged at a longitudinal end of the main portion and folded over the main portion forming an acute angle with respect to the main portion, wherein at least one of the two end portions of each of the plurality of magnet wires is wrapped around and electrically connected to the tang portion of one of the plurality of conductive terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power tool comprising:
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a housing; a motor housed inside the housing, the motor having a stator assembly and a rotor rotatably arranged inside the stator, the stator assembly comprising; a lamination stack defining a plurality of poles and having an outer surface that is substantially cylindrical and extends in a longitudinal direction of the motor; a plurality of magnet wires, each magnet wire including two end portions and two winding portions located between the two end portions and wound on two opposite poles of said plurality of poles; a non-conductive member disposed on a portion of the outer surface of the lamination stack; and a plurality of conductive terminals longitudinally arranged on the non-conductive member along the outer surface of the lamination stack to provide electric power from a power source to the plurality of magnet wires, each conductive terminal including a main portion mounted on the non-conductive member extending in the longitudinal direction of the motor and in parallel to the outer surface of the lamination stack with the non-conductive mount located between the main portions of the plurality of terminals and the outer surface of the lamination stack, each conductive terminal further including a tang portion arranged at a longitudinal end of the main portion and folded over the main portion forming an acute angle with respect to the main portion, wherein at least one of the two end portions of each of the plurality of magnet wires is wrapped around and electrically connected to the tang portion of one of the plurality of conductive terminals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification