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US 2011/0298313 A1Published application
Motor With Permanent Magnets and Method of Manufacturing Power Tool With Same
AssigneeBlack & Decker Inc.
InventorsStephen Osborne, Colin Crosby, Sankarshan Murthy, Hung T. Du, Earl M. Ortt
Life of this patent
Estimating the term…
Abstract
A permanent magnet electric motor has a stator and a rotor. The stator has a stator housing with at least a North pole and a South pole, each pole including permanent magnets affixed to an inner surface of the stator housing, where at least two of the magnets within a pole have dissimilar characteristics, e.g., different widths or different grades of demagnetization resistance.
Claims23
A power tool, comprising:
- a housing;
- a permanent magnet electric motor in the housing, the electric motor including a rotor and a stator, the stator having a stator housing with at least a North pole and a South pole, each pole including a plurality of permanent magnets affixed to an inner surface of the stator housing, wherein at least two magnets of the plurality of permanent magnets have dissimilar characteristics;
- and
- an output member coupled to the electric motor.
1 more element
A power tool, comprising:
- a housing;
- a permanent magnet electric motor in the housing, the electric motor including a rotor and a stator, the stator having a stator housing with at least a North pole and a South pole, each pole including a first plurality of flat permanent magnets affixed to an inner surface of the stator housing and a second plurality of flat magnets stacked over at least two of the first plurality of flat magnets;
- and
- an output member coupled to the electric motor.
1 more element
Dependencies are inferred from the claim text.