公开(公告)号：US20240186845A1

公开(公告)日：2024-06-06

申请号：US18525279

申请日：2023-11-30

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Jacob G. Wood ,  Carter H. Ypma ,  Jordan P. Gilsinger ,  Christopher J. Kujawski ,  Ryan Buttke ,  Andrew T. Beyerl ,  Linnea Emerson ,  Matthew R. Bailey ,  Jeffrey C. Hessenberger

IPC: H02K1/18 ,  H02K7/08 ,  H02K7/14 ,  H02K11/21

CPC classification number: H02K1/18 ,  H02K7/083 ,  H02K7/145 ,  H02K11/21 ,  H02K2211/03

Abstract: An electric motor includes a rotor assembly including a rotor shaft, a rotor body fixedly coupled to the rotor shaft, and a plurality of magnets coupled to the rotor body. The electric motor also includes a stator assembly at least partially received within the rotor body. The stator assembly includes a stator mount including a stator support portion and a motor support portion. The stator assembly also includes a stator core assembly fixedly supported by the stator mount, the stator core assembly defining a central bore that receives the rotor shaft and the stator support portion. The electric motor also includes a bearing having an outer race and an inner race, the outer race being supported by the stator core assembly, and the inner race supporting the rotor shaft for rotation relative to the stator assembly. The stator core assembly further defines a bearing pocket adjacent to the central bore.

公开(公告)号：US20250167655A1

公开(公告)日：2025-05-22

申请号：US19029377

申请日：2025-01-17

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Andrew T. Beyerl ,  Keith Boulanger ,  Matthew R. Bailey ,  Carl B. Westerby

IPC: H02K23/02 ,  H02K1/14 ,  H02K3/12 ,  H02K3/34 ,  H02K7/14 ,  H02K9/00 ,  H02K11/215 ,  H02K11/33 ,  H02K29/08 ,  H05K1/02

Abstract: A power tool including a brushless electric motor having a rotor coupled to a shaft that defines a rotational axis, a stator in which the rotor is received, the stator including a core having a plurality of stator teeth, the core defining an outer circumference, an end cap provided adjacent an end of the core, and a plurality of terminals mounted on the end cap, each terminal of the plurality of terminals includes an angled portion provided at a non-parallel angle to the rotational axis and extending outside the outer circumference of the core. The power tool includes one or more coils wound around respective stator teeth and the end cap to form coil windings. A portion of the coils is routed by at least one of the terminals to form an electrical connection between at least one of the coil windings and the at least one of the terminals.

公开(公告)号：US12081067B2

公开(公告)日：2024-09-03

申请号：US17052456

申请日：2020-06-02

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Andrew T. Beyerl ,  Keith Boulanger ,  Ryan B. Jipp ,  Timothy R. Obermann ,  Matthew R. Bailey

IPC: H02K1/14 ,  H02K3/34 ,  H02K3/52

CPC classification number: H02K1/148 ,  H02K3/345 ,  H02K3/522

Abstract: A stator includes insulation including a back insulation portion covering a back stator portion, a first tooth portion covering a first tooth, a second tooth portion covering a second tooth. A first flange portion has a first face that is in facing relationship with the back insulation portion. A second flange portion has a second face that is in facing relationship with the back insulation portion. The first face and the second face together substantially defining a boundary plane, such that a cross-sectional slot area is defined between the back insulation portion, the first tooth portion, the second tooth portion, and the boundary plane. A plurality of conductive wires are arranged in the cross-sectional slot area, the wires defining a cross-sectional winding area within the cross-sectional slot area. A ratio of the cross-sectional winding area to the cross-sectional slot area is greater than or equal to 0.45.

公开(公告)号：US11894755B2

公开(公告)日：2024-02-06

申请号：US17895788

申请日：2022-08-25

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Keith M. Klosterman ,  Matthew R. Bailey ,  Jorge L. Ibarra ,  Lu Yang ,  Hongru Huang

IPC: H02K7/14 ,  H02K11/33

CPC classification number: H02K7/145 ,  H02K11/33 ,  H02K2203/09 ,  H02K2211/03

Abstract: A power tool includes a housing and an electric motor. The electric motor includes a rotor assembly including a rotor shaft and a stator assembly including a plurality of stator segments. Each stator segment includes a core, an insulator at least partially covering the core, and a coil winding. The insulator includes a mounting portion. The electric motor also includes a printed circuit board assembly configured to direct electric current to each coil winding, and a bus bar assembly attached to at least one of the mounting portions and configured to electrically connect the coil windings to the printed circuit board assembly. The bus bar assembly includes a molded body and a plurality of conductors. The bus bar assembly defines a bearing pocket. The electric motor further includes rotor bearing that is received into the bearing pocket and that supports the rotor shaft for rotation relative to the stator assembly.

公开(公告)号：US20230370011A1

公开(公告)日：2023-11-16

申请号：US18318349

申请日：2023-05-16

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Shi-Uk Chung ,  Matthew R. Bailey

IPC: H02P29/00

CPC classification number: H02P29/00

Abstract: A power tool including a battery pack interface configured to receive a removable and rechargeable battery pack, a motor including a rotor and a stator, the rotor operable to rotate relative to the stator, and a switching module that includes a plurality of switching devices connected between the battery pack interface and the motor. The power tool further includes a controller including a processor and a memory. The controller is configured to receive a signal from an external device, control the switching module to provide a high frequency current signal from battery pack to the motor in response to receiving the signal, the motor configured to emit an audible sound in response to the high frequency current signal, and control the switching module to stop providing the high frequency current signal to the motor.

公开(公告)号：US11667021B2

公开(公告)日：2023-06-06

申请号：US16376513

申请日：2019-04-05

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Matthew R. Bailey ,  Will Didier ,  Jeffrey C. Hessenberger

IPC: H02K7/02 ,  B25C1/06

CPC classification number: B25C1/06

Abstract: A power tool includes a motor having a motor shaft that rotates about a motor axis in a first rotational direction. The power tool also includes a fan assembly attachable to the motor shaft for rotation in the first rotational direction. The fan assembly includes a fan body, a bearing having a race that rotates with the fan body, and a flywheel rotatably affixed to the fan body. The race is freely rotatable relative to the motor shaft in the first rotational direction, and fixed against rotation relative to the motor shaft in a second rotational direction opposite the first rotational direction. The flywheel has a central portion that defines a central bore, and the race is received into the central bore and rotatably affixed to the flywheel.

公开(公告)号：US20240097542A1

公开(公告)日：2024-03-21

申请号：US18521235

申请日：2023-11-28

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Andrew T. Beyerl ,  Keith Boulanger ,  Matthew R. Bailey ,  Carl B. Westerby

IPC: H02K23/02 ,  H02K1/14 ,  H02K3/12 ,  H02K3/34 ,  H02K7/14 ,  H02K11/215 ,  H02K11/33 ,  H02K29/08 ,  H05K1/02

CPC classification number: H02K23/023 ,  H02K1/146 ,  H02K3/12 ,  H02K3/345 ,  H02K7/145 ,  H02K11/215 ,  H02K11/33 ,  H02K29/08 ,  H05K1/02 ,  H02K9/00

Abstract: A method of manufacturing a brushless electric motor including providing a stator that includes a core defining a plurality of stator teeth, positioning a rotor within the stator, coupling a stator end cap to an end of the core, winding a plurality of coils on the plurality of stator teeth, and overmolding a plurality of coil contact plates within the stator end cap. The coil contact plates short-circuit diagonally opposite coils on the stator.

公开(公告)号：US11881750B2

公开(公告)日：2024-01-23

申请号：US17410298

申请日：2021-08-24

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Andrew T. Beyerl ,  Keith Boulanger ,  Matthew R. Bailey ,  Carl B. Westerby

IPC: H02K23/02 ,  H02K3/12 ,  H02K3/34 ,  H02K11/33 ,  H02K11/215 ,  H02K7/14 ,  H02K29/08 ,  H05K1/02 ,  H02K1/14 ,  H02K9/00

CPC classification number: H02K23/023 ,  H02K1/146 ,  H02K3/12 ,  H02K3/345 ,  H02K7/145 ,  H02K11/215 ,  H02K11/33 ,  H02K29/08 ,  H05K1/02 ,  H02K9/00 ,  H02K2211/03

Abstract: A motor assembly for use with a power tool includes a motor housing, a brushless electric motor disposed at least partially in the motor housing, and a PCB assembly coupled to the motor housing. The PCB assembly includes a heat sink, a power PCB coupled to a first side of the heat sink, and a position sensor PCB coupled to a second side of the heat sink opposite the first side and in facing relationship with the motor.

公开(公告)号：US20230256578A1

公开(公告)日：2023-08-17

申请号：US18138435

申请日：2023-04-24

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Matthew R. Bailey ,  Will Didier ,  Jeffrey C. Hessenberger

IPC: B25C1/06

CPC classification number: B25C1/06

Abstract: A method of cooling an electric motor configured for use in a power tool. The electric motor has a motor shaft rotatable about a motor axis. The power tool further includes a fan assembly attachable to the motor shaft and an energy storage device coupled to the motor shaft and to the fan assembly. The method includes activating the electric motor to supply torque to the motor shaft. The method further includes rotating the motor shaft and the fan assembly about the motor axis. The fan assembly generates an airflow to cool the electric motor. Moreover, the method includes supplying torque from the electric motor to the energy storage device and deactivating the electric motor to stall rotation of the motor shaft. The fan assembly continues to rotate about the motor axis to generate the airflow after rotation of the motor shaft has ceased.

公开(公告)号：US20190314968A1

公开(公告)日：2019-10-17

申请号：US16376513

申请日：2019-04-05

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Matthew R. Bailey ,  Will Didier

IPC: B25C1/06

Abstract: A power tool includes a motor having a motor shaft that rotates about a motor axis in a first rotational direction. The power tool also includes a fan assembly attachable to the motor shaft for rotation in the first rotational direction. The fan assembly includes a fan body and a bearing having a race that is rotatably affixed to the fan body. The race is freely rotatable relative to the motor shaft in the first rotational direction, and fixed against rotation relative to the motor shaft in a second rotational direction opposite the first rotational direction.