Electric motor for a power tool
AssigneeMilwaukee Electric Tool Corporation
InventorsJeffrey C. Hessenberger, Michael Kolden, Andrew T. Beyerl
Life of this patent
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Abstract
An electric motor for use with a power tool includes a rotor having a body, a stator having a plurality of electromagnetic coils surrounding the rotor, an output shaft coupled to the rotor for rotation with the rotor, and a plurality of magnets positioned within the body of the rotor. The motor also includes a mechanical magnet holder coupled to at least one of the rotor and the output shaft to engage each of the plurality of magnets. The mechanical magnet holder inhibits movement of the plurality of magnets out of the body of the rotor.
Claims20
An electric motor for use with a power tool, the motor comprising:
- a rotor including a body having a first face, a second face, and a plurality of slots formed in the body, the plurality of slots extending between the first face and the second face;
- a stator including a plurality of electromagnetic coils surrounding the rotor;
- an output shaft coupled to the rotor for rotation with the rotor;
- a plurality of magnets positioned within the plurality of slots;
- and
- a mechanical magnet holder including a sense magnet coupled to the output shaft, the sense magnet engaging each of the plurality of magnets to inhibit movement of the plurality of magnets out of the plurality of slots.
An electric motor for use with a power tool, the motor comprising:
- a rotor including a body having a first face and a second face;
- a stator including a plurality of electromagnetic coils surrounding the rotor;
- an output shaft coupled to the rotor for rotation with the rotor;
- a plurality of magnets coupled to the body of the rotor;
- and
- a mechanical magnet holder including a sense magnet coupled to the output shaft, the sense magnet having a face that abuts the first face of the body of the rotor to inhibit movement of the plurality of magnets relative to the body of the rotor.
A power tool comprising:
- a housing;
- a drive mechanism positioned within the housing;
- and
- an electric motor positioned within the housing and operable to drive the drive mechanism, the motor including
- a rotor including a body having a first face, a second face, and a plurality of slots formed in the body, the plurality of slots extending between the first face and the second face,
- a stator including a plurality of electromagnetic coils surrounding the rotor,
- an output shaft coupled to the rotor for rotation with the rotor,
- a plurality of magnets positioned within the plurality of interior slots, and
- a mechanical magnet holder including a sense magnet coupled to the output shaft, the sense magnet having a face that abuts the first face of the body of the rotor to hold the plurality of magnets within the plurality of slots.
Dependencies are inferred from the claim text.