Stator for rotary machine and method of manufacturing the stator

• US 20020130582A1
• Filed: 07/17/2001
• Published: 09/19/2002
• Est. Priority Date: 03/15/2001
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Asao, Yoshihito, Oohashi, Atsushi, Oketani, Naohiro, Katayama, Hiroki, Takizawa, Takushi
• Granted Patent: US 6,664,703 B2
• Time in Patent Office: Days
• US Class Current: 310/216
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 15/024 with slots
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/345 between conductor and core, e.g. slot insulation
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A stator for a rotary machine includes a rotor 7 and a stator 8 having a stator iron core 15 disposed oppositely around the outer circumference of the rotor 7 and a stator coil 16 fitted around the iron core 15, wherein the iron core 15 has a laminated iron core 150 with plural axially extending slots 15a formed circumferentially at predetermined pitches, an insulating resin 100 is coated on an axial end face 15f of the iron core 15 and an inner wall face of a slot 15a in the laminated iron core 150 to provide insulation between the iron core 15 and the stator coil 16, and the iron core is cylindrically shaped by bringing both circumferential end portions 15g of the laminated iron core 150 into contact to bend the laminated iron core 150 so that an opening face 15b of the slot 15a is directed inside.

Claims

1. A stator for a rotary machine, comprising:

a rotor; and

a stator having a stator iron core disposed oppositely around the outer circumference of said rotor and a stator coil fitted around said stator iron core,

wherein said stator iron core has a laminated iron core with a plurality of axially extending slots formed at a predetermined pitch along a circumferential direction, an insulating resin is coated at least on an axial end face of said stator iron core and an inner wall face of a slot in said laminated iron core to provide insulation between said stator iron core and said stator coil, and said laminated iron core is formed in a cylindrical shape by bringing both circumferential end portions of said laminated iron core into contact with each other in such a way as to bend said laminated iron core so that an opening face of said slot on the inner circumferential side may be directed inside.

2. The stator for the rotary machine according to claim 1, wherein the insulating resin is coated to be thicker on the axial end face of said stator iron core than on the inner wall face of the slot on the axially central portion.

3. The stator for the rotary machine according to claim 1, wherein the insulating resin is coated to be thicker near an opening face of said stator iron core on the inner circumferential side than any other portion of the inner wall face of said slot.

4. The stator for the rotary machine according to claim 1, wherein the insulating resin is coated to take an R shape or chamfered shape on the axial end face of said stator iron core.

5. The stator for the rotary machine according to claim 1, wherein the insulating resin is coated to take an R shape or chamfered shape on the axial end face of said stator iron core.

6. The stator for the rotary machine according to claim 1, wherein the insulating resin on the axial end face of said stator iron core is coated to be thicker on the inner diameter side of a core back neutral axis than on the outer diameter side.

7. The stator for the rotary machine according to claim 1, wherein the insulating resin on the inner wall face of said slot is coated to be thinner on the outer circumferential side of said stator iron core than any other portion of said inner wall face.

8. The stator for the rotary machine according to claim 1, wherein a notch is provided on the inner wall face of said slot on the outer circumferential side of said stator iron core, and the insulating resin is coated to be thinner in said notch than any other portion of said inner wall face.

9. The stator for the rotary machine according to claim 1, wherein the axial end face of said stator iron core is formed in an irregular conformation.

10. The stator for the rotary machine according to claim 1, wherein the inner wall face of said slot is formed in the irregular conformation.

11. The stator for the rotary machine according to claim 1, wherein the insulating resin is coated to be thinner on the both ends of said laminated iron core in the circumferential direction than any other portion of said laminated iron core.

12. The stator for the rotary machine according to claim 1, wherein the insulating resin is epoxy based insulating resin.

13. The stator for the rotary machine according to claim 1, wherein the insulating resin is silicone based insulating resin.

14. The stator for the rotary machine according to claim 1, wherein the stator coil is inserted into the slot to be aligned in one row in a diameter direction of said stator iron core.

15. The stator for the rotary machine according to claim 1, wherein the stator coil has a substantially rectangular shape in cross section.

16. The stator for the rotary machine according to claim 1, wherein said stator coil has a plurality of coils folded back outside said slot on the end face side of said stator iron core and wound to take alternately an inner layer and an outer layer in a slot depth direction within said slot for every predetermined number of slots, and a turn portion of said coil element wire folded back outside said slot on the end face side of said stator iron core is aligned in the circumferential direction to constitute a coil end group.

19. The method for manufacturing the stator for the rotary machine according to claim 17 or 18, wherein said insulating resin is applied by electrostatic powder coating.

20. The method for manufacturing the stator for the rotary machine according to claim 17 or 18, wherein the insulating resin is applied from an opening face of the slot on the inner circumferential side of said stator iron core.

17. A method for manufacturing a stator for a rotary machine, comprising the steps of:

forming a laminated iron core by laminating a straight steel plate sheet with a slot shape punched;

coating an insulating resin at least on an axial end face of a stator iron core and on an inner wall face of a slot in said laminated iron core;

forming the cylindrical stator iron core by placing the both circumferential ends of said laminated iron core coated with the insulating resin into contact with each other; and

winding a stator coil around said stator iron core.

18. A method for manufacturing a stator for a rotary machine, comprising the steps of:

forming a laminated iron core by laminating a straight steel plate sheet with a slot shape punched;

coating an insulating resin at least on an axial end face of a stator iron core and on an inner wall face of a slot in said laminated iron core;

winding a stator coil around said laminated iron core coated with the insulating resin; and

forming the cylindrical stator iron core by placing both circumferential ends of said laminated iron core having said stator coil wound into contact with each other.