Field assemblies having pole pieces with axial lengths less than an axial length of a back iron portion 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, the pole portions having an axial length less than an axial length of back iron portion;
b. the field coils formed so that ends of the field coils don'"'"'t extend beyond axial ends of the back iron portion; and
c. an armature disposed in the stator.
1 Assignment
0 Petitions
Accused Products
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 axial lengths less than an axial length of a back iron portion. Alternatively, or in addition, the pole portions have axially opposed ends that decrease in width. Alternatively, or in addition, the pole portions have dovetail features that are received in corresponding recesses of the back iron portion.
-
Citations
16 Claims
-
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, the pole portions having an axial length less than an axial length of back iron portion; b. the field coils formed so that ends of the field coils don'"'"'t extend beyond axial ends of the back iron portion; and c. an armature disposed in the stator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A power tool, comprising:
-
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, the pole pieces having an axial length less than an axial length of back iron portion; ii. the field coils formed so that ends don'"'"'t extend beyond axial ends of the return path pieces; and iii. an armature disposed in the stator. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification