Field assemblies having pole pieces with ends that decrease in width, and methods of making same
First Claim
Patent Images
1. An electric motor, comprising:
- a. a stator having a back iron portion and at least two pole portions on which field coils are disposed, each pole portion having opposed ends that gradually decrease in width; and
b. an armature disposed 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 that includes pole portions that have axially opposed ends that gradually decrease in width. The pole portions may also have dovetail features that are received in corresponding recesses of the back iron portion.
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Citations
24 Claims
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1. An electric motor, comprising:
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a. a stator having a back iron portion and at least two pole portions on which field coils are disposed, each pole portion having opposed ends that gradually decrease in width; and
b. an armature disposed in the stator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18)
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10. A power tool, comprising:
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a. a housing;
b. a motor disposed in the housing, the motor including;
i. a stator having a back iron portion and at least two pole portions on which field coils are disposed, each pole portion having opposed ends that gradually decrease in width; and
ii. an armature disposed in the stator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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19. A method of making an electric motor, comprising:
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a. forming a stator with a back iron portion and at least two pole portions so that the pole portions have opposed ends that gradually decrease in width;
b. disposing field coils on the pole portions; and
c. disposing an armature in the stator. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification