ELECTRIC MOTOR AND METHOD FOR PRODUCING ELECTRIC MOTOR

• US 20080007134A1
• Filed: 06/26/2007
• Published: 01/10/2008
• Est. Priority Date: 07/06/2006
• Status: Abandoned Application

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: SHIMURA, Yoshifumi, KIMIJIMA, Masami
• Application Number:
  US11/768,609
• Publication Number:
  US 20080007134A1
• Time in Patent Office: Days
• US Class Current: 310/214
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/44 Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

An electric motor (10) comprising a stator core (11) in which slots (12) are formed, and a coil (20) is inserted in the slots. The slots are filled with an insulating resin (3), and the surface of the coil is coated with a coating layer, such as a phenol type epoxy powdery coating material or a phenol type varnish material. This prevents the insulating layer of the coil from being corroded by a strong alkaline liquid. The coating layer may have a thickness nearly equal to the thickness of an insulating paper. Further, the coating layer may have a thickness nearly equal to, or larger than, the thickness of the insulating paper.

Claims

1. An electric motor comprising:

a stator core, in which slots are formed; and

a coil formed by an electrical wire covered with an insulating layer and inserted in said slots;

wherein said slots are filled with an insulating resin; and

the surface of said coil is coated with a coating layer.

2. The electric motor according to claim 1, wherein said coating layer is made from a phenol type epoxy powdery coating material or a phenol type varnish material.

3. The electric motor according to claim 1, wherein the thickness of the coating layer is nearly equal to, or larger than, the thickness of an insulating paper.

4. The electric motor according to claim 1, wherein said coil is formed by a self welding type wire.

5. The electric motor according to any claim 1, wherein said coil is formed around a resin bobbin.

6. A method for producing an electric motor comprising:

coating the surface of a coil with a coating layer, the coil being formed by an electrical wire covered with an insulating layer;

inserting said coil into slots formed in the stator core; and

filling said slots with an insulating resin.

7. The method for producing an electric motor according to claim 6, wherein said coating layer is made from a phenol type epoxy powdery coating material or a phenol type varnish material.