Efficient motor
AssigneeBlack & Decker Inc.
InventorsRobert F. Burkholder, Dalton McFarland
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a method and system for improving motor efficiency. The motor of the present invention may provide at least 1.9 Horsepower (HP) while drawing 15–16 Amperes at 120 Volts. The motor of the present invention may provide at least 75% efficiency and the speed of 12,000 to 14,000 RPM. A small size and low weight motor may be provided by the present invention. Further, it is contemplated that the motor of the present invention may be produced at a low cost per unit with a volume of 500,000 to 1,000,000 units per year. It is also contemplated that the motor may be suitable for use in consumer and professional products by complying with recognized safety standards such as U.L., CSA, CEE and the like.
Claims20
A motor comprising:
- a stator having two electromagnetic poles diametrically oppose each other;
- a rotor including a rotor core rotatably mounted with a shaft, said rotor core being formed by stacking a plurality of laminations which has a central bore and a plurality of T shaped teeth which are radially extending;
- and
- a commutator being mounted on said shaft, said commutator being delivered electric power from brushes and connected to said rotor core,
- wherein said plurality of T shaped teeth form salient poles of said rotor core, and
- wherein said stator and said rotor have geometric attributes such that:
- R1=G*1.013,
- wherein G is defined as thickness of a field yoke, R1 is defined as a distance from a center of said central hole to an end of a groove which separates said plurality of T shaped teeth.
A universal motor providing 1.9 HP at 120 Volts, comprising;
- a frame accommodating a plurality of components of said motor;
- a stator having two magnetic poles which diametrically oppose each other, said two magnetic poles formed in dish shape;
- a rotor including a rotor core being formed by stacking a plurality of laminations which have a central hole and a plurality of T shaped teeth which are radially extending, said rotor core rotatable mounted with a shaft, said shaft mounted on said frame by at least two bearings;
- and
- a commutator being a mounted on said shaft, said commutator being delivered electric power from brushes and electrically connected to said rotor core,
- wherein said stator and said rotor have geometric attributes such that:
- R1=G*1.013;
- C=((2*G)/coil pitch)*0.896;
- H=G*1.274;
- and
- I=G*2*1.104,
- wherein G is defined as thickness of a field yoke, R1 is defined as a distance from a center of said central hole to an end of a groove which separates said plurality of T shaped teeth, C is defined as a thickness of each of said plurality of T shaped teeth, I is defined as a thickness of a bottom part of a dish shaped electromagnetic pole and H is defined as a diagonal thickness of said field yoke where said bottom part of said dish shaped electromagnetic pole is attached.
Dependencies are inferred from the claim text.