Brushless motor assembly for a fastening tool
AssigneeBlack & Decker Inc.
InventorsJohn B. Fogle, Colin M. Crosby, David J. Smith, Merritt J. Tennison, Madhur M. Purohit
Life of this patent
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Abstract
An electric brushless DC motor is provided including an outer rotor assembly having a metallic rotor body, rotor magnets mounted within an inner surface of the rotor body, and a molded structure formed within the rotor body. The molded structure includes at least one of: a main body formed on inner surface of the rotor body to securely cover and retain the rotor magnets on the inner surface of the rotor body, an axial fan formed at an end of the rotor body opposite the rotor magnets, and/or a sense magnet mount formed at approximately a radial center portion of the axial fan.
Claims13
An electric brushless DC (BLDC) motor comprising:
- an outer rotor assembly having a substantially-cylindrical metallic rotor body, a plurality of rotor magnets mounted within an inner surface of the rotor body, and a flywheel having a plurality of annular rings formed on an outer surface of the rotor body;
- a molded structure formed within the rotor body formed on an inner surface of the rotor body to securely cover and retain the rotor magnets on the inner surface of the rotor body, the molded structure further comprising at least one radial member projecting inwardly from the main body towards a center of the outer rotor assembly, and a bearing support member having a substantially cylindrical shape in an axial direction of the outer rotor and supported by the at least one radial member;
- and
- a stator assembly received inside the outer rotor assembly and mounted on a shaft,
- wherein the at least one radial member is oriented radially in-line with at least a portion of the flywheel.
An electric brushless DC (BLDC) motor comprising:
- an outer rotor assembly having a substantially-cylindrical metallic rotor body, and a plurality of rotor magnets mounted within an inner surface of the rotor body;
- a molded structure formed within the rotor body formed on an inner surface of the rotor body to securely cover and retain the rotor magnets on the inner surface of the rotor body, the molded structure further comprising at least one radial member projecting inwardly from the main body towards a center of the outer rotor assembly, and a bearing support member having a substantially cylindrical shape in an axial direction of the outer rotor and supported by the at least one radial member;
- a stator assembly received inside the outer rotor assembly and fixedly mounted on a shaft;
- and
- at least one bearing located within the bearing support member and mounted on the shaft to rotationally support the outer rotor assembly relative to the shaft.
Dependencies are inferred from the claim text.