ELECTRIC MOTOR ARMATURE WITH STRESS RELIEVED, RESILIENT COMMUTATOR LEAD CONNECTIONS

• US 3,697,792 A
• Filed: 01/25/1971
• Issued: 10/10/1972
• Est. Priority Date: 02/02/1970
• Status: Expired due to Term

• Current Assignee: Precis Limited (Compagnie de Saint-Gobain SA)
• Original Assignee: Albert Norman Roue
• Inventors: Roue, Albert Norman
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Budd, Mark O.
• Application Number:
  US05/109,504
• Time in Patent Office: 624 Days
• Field of Search: 310/233-236,237
• US Class Current: 310/234
• CPC Class Codes: H02K 13/04 Connections between commutator segments and windings

Abstract

An armature for an electric motor has commutator segments, an armature coil structure consisting of coils having end portion which lead to the commutator segments and each of which has a looped part adjacent the associated commutator segment, and sleeves of yieldable resilient material snugly surrounding the looped parts. A moulded rigid mass of resinous material extends locally only in the region of the commutator and encapsulates the sleeves parts of the coil end portions and the connections of the end portions to the commutator segments. The yieldable nature of the sleeves permits a degree of relative movement of the looped parts within the moulded mass. A thin layer trickle coating of an electrically insulating material encases the parts of the coil structure not encapsulated in said mass.

Claims

2. An armature as claimed in claim 1, wherein said mass of resinous material is externally of frusto-conical shape.

3. An armature as claimed in claim 1, wherein the ends of the sleeves are in axial abutment with the commutator segments.

4. An armature as claimed in claim 1, wherein the sleeves are made from silicone rubber.