Field assemblies and methods of making same with field coils having multiple coils
First Claim
Patent Images
1. A method of making an electric motor, comprising:
- a. forming field coils to a predetermined shape including winding them so that each field coil has a plurality of coils, each of the coils of each field coil serving a different function in that field coil;
b. forming pole pieces and return path pieces;
c. placing the field coils on the pole pieces after forming them to the predetermined shape;
d. mating the pole pieces and return path pieces after placing the field coils on the pole pieces to form a stator having an outside diameter; and
e. placing an armature in the stator.
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Abstract
An electric motor, power tool using the electric motor, and method of making the electric motor includes making a stator to have pole pieces on which field coils are disposed. Each field coil has a plurality of coils where each coil serves a different function in that field coil. In an aspect, one of the coils is a run coil and wound with larger wire and another of the coils is a brake coil wound with smaller wire.
107 Citations
15 Claims
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1. A method of making an electric motor, comprising:
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a. forming field coils to a predetermined shape including winding them so that each field coil has a plurality of coils, each of the coils of each field coil serving a different function in that field coil;
b. forming pole pieces and return path pieces;
c. placing the field coils on the pole pieces after forming them to the predetermined shape;
d. mating the pole pieces and return path pieces after placing the field coils on the pole pieces to form a stator having an outside diameter; and
e. placing an armature in the stator. - View Dependent Claims (2, 3, 4, 5)
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6. An electric motor, comprising:
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a. a stator having pole pieces mated to return path pieces, a field coil disposed on a pole of each pole piece, each field coil having a plurality of coils, each of the coils of each field coil serving a different function in that field coil, and return path pieces mated to the pole pieces; and
b. an armature disposed in the stator. - View Dependent Claims (7, 8, 9, 10)
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11. A hand-held power tool, comprising:
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a. a housing; and
b. a motor disposed in the housing, the motor including;
i. a stator having pole pieces mated to return path pieces, a field coil disposed on a pole of each pole piece, each field coil having a plurality of coils, each coil of each field coil serving a different function in that field coil, and return path pieces mated to the pole pieces; and
ii. an armature disposed in the stator. - View Dependent Claims (12, 13, 14, 15)
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Specification