Electric motor with carbon track commutator
First Claim
1. An electric motor comprisinga stationary part and a rotating part,said rotating part comprising a shaft having a rotation axis and a commutator subassembly fixed symmetrically about said shaft,said commutator subassembly comprisinga plurality of circumferentially spaced carbon-based material segments surrounding said shaft, each segment having a brush contacting surface,a same plurality of metallic commutators each having a first part secured relative to said shaft,each of said commutators comprising a second part and said second part including a tang member and a wire being electrically and mechanically connected to said tang member,a mounting member made of insulating material for securing said plurality of segments to each other,each of said commutators including a third part that comprises a pawl member formed from and extending from said first part, said pawl member having a free distal end when formed relative to said first part,at least a portion of said pawl member being molded to, and embedded within, and in contact with said one of said segments such that the carbon-based material segment completely surrounds said at least a portion of said pawl member.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric motor according to the principles of the present invention includes a stator or stationary part of the motor and an armature. The armature includes a shaft having a rotation axis and a commutator subassembly fixed symmetrically to the shaft that includes an insulating body surrounding the shaft and a plurality of circumferentially spaced, carbon-based material segments surrounding the shaft. The carbon segments are held to the body and each segment has a brush contacting surface. An equal plurality of metallic commutator members have at least a part located and molded within the corresponding carbon segment for providing good mechanical and electrical connection between the carbon segment and metallic commutator member and to isolate the metallic part within the carbon segment from harmful external environments such as described above. According to other aspects of the present invention, a second part of each metallic commutator segment extends from the carbon segment into and is molded within the insulating body. This design increases the mechanical connection between the corresponding segment and the body while achieving the isolation and electrical contact described above. A third part of the metallic commutator forms a U-shaped tang.
-
Citations
14 Claims
-
1. An electric motor comprising
a stationary part and a rotating part, said rotating part comprising a shaft having a rotation axis and a commutator subassembly fixed symmetrically about said shaft, said commutator subassembly comprising a plurality of circumferentially spaced carbon-based material segments surrounding said shaft, each segment having a brush contacting surface, a same plurality of metallic commutators each having a first part secured relative to said shaft, each of said commutators comprising a second part and said second part including a tang member and a wire being electrically and mechanically connected to said tang member, a mounting member made of insulating material for securing said plurality of segments to each other, each of said commutators including a third part that comprises a pawl member formed from and extending from said first part, said pawl member having a free distal end when formed relative to said first part, at least a portion of said pawl member being molded to, and embedded within, and in contact with said one of said segments such that the carbon-based material segment completely surrounds said at least a portion of said pawl member.
Specification