Stator assembly for a brushless motor in a power tool
First Claim
Patent Images
1. A power tool comprising:
- a housing;
a motor housed inside the housing, the motor having a stator assembly and a rotor pivotably arranged inside the stator, the stator assembly comprising 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;
a bus bar longitudinally arranged along an outer surface of the lamination stack, the bus bar having a plurality of conductive terminals electrically coupled to the plurality of field windings and a power source; and
two end insulators arranged at longitudinal ends of the lamination stack, wherein the two end insulators include retention features arranged to mate along the outer surface of the lamination stack to retain the bus bar along the outer surface of the lamination stack.
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Accused Products
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.
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Citations
44 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 pivotably arranged inside the stator, the stator assembly comprising 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;
a bus bar longitudinally arranged along an outer surface of the lamination stack, the bus bar having a plurality of conductive terminals electrically coupled to the plurality of field windings and a power source; and
two end insulators arranged at longitudinal ends of the lamination stack, wherein the two end insulators include retention features arranged to mate along the outer surface of the lamination stack to retain the bus bar along the outer surface of the lamination stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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 pivotably arranged inside the stator, the stator assembly comprising 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;
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; and
two end insulators arranged at longitudinal ends of the lamination stack, wherein the two end insulators include retention features arranged to mate along the outer surface of the lamination stack to retain the plurality of conductive terminals along the outer surface of the lamination stack. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. 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 pivotably arranged inside the stator, the stator assembly comprising 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;
a bus bar longitudinally arranged along an outer surface of the lamination stack, the bus bar having a plurality of conductive terminals electrically coupled to the plurality of field windings and a power source; and
an end insulator arranged at a longitudinal end of the lamination stack, wherein the end insulator comprises an extension portion extending longitudinally over an outer surface of the lamination stack and vertical walls extending from the extension portion, the vertical walls and the extension portion defining insulating channels for retention of the conductive terminals. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. 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 pivotably arranged inside the stator, the stator assembly comprising 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;
a bus bar longitudinally arranged along an outer surface of the lamination stack, the bus bar having a plurality of conductive terminals electrically coupled to the plurality of field windings and a power source; and
an end insulator arranged at a longitudinal end of the lamination stack, wherein the end insulator comprises at least one retaining wall protruding longitudinally along the outer surface of the lamination stack to retain the bus bar, wherein the stator assembly further comprises a second end insulator arranged at another longitudinal end of the lamination stack, the second end insulator having at least one retaining wall that mates with the retaining wall of the end insulator to retain the bus bar. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. 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 pivotably arranged inside the stator, the stator assembly comprising 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;
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; and
an end insulator arranged at a longitudinal end of the lamination stack, wherein the end insulator comprises an extension portion extending longitudinally over an outer surface of the lamination stack and vertical walls extending from the extension portion, the vertical walls and the extension portion defining insulating channels for retention of the conductive terminals. - View Dependent Claims (34, 35, 36, 37, 38)
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39. 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 pivotably arranged inside the stator, the stator assembly comprising 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;
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; and
an end insulator arranged at a longitudinal end of the lamination stack, wherein the end insulator comprises a plurality of retaining walls protruding longitudinally along the outer surface of the lamination stack to retain the plurality of conductive terminals. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification