Stator heating apparatus and stator heating method

• US 10,468,951 B2
• Filed: 07/30/2014
• Issued: 11/05/2019
• Est. Priority Date: 08/02/2013
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Kimura, Hideaki, Niwa, Tsuyoshi, Sugimoto, Takamitsu
• Primary Examiner(s): Vo, Peter Dungba
• Assistant Examiner(s): Kue, Kaying
• Application Number:
  US14/902,275
• Publication Number:
  US 20160254734A1
• Time in Patent Office: 1,924 Days
• Field of Search: 29596, 29598, 29732
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines

Abstract

A stator heating apparatus that includes a support that supports a stator in which a stator coil is mounted to a stator core and that is driven by a rotary to rotate the stator; a first heater that includes an induction coil inserted into a cavity portion provided at an axial center of the stator core of the stator supported by the support to be disposed to heat the stator through induction heating, the first heater heating the stator from a radially inner side of the stator; and a second heater that includes a hot-air outlet port that blows hot air toward an outer surface of a coil end portion of the stator supported by the support to heat the stator using the hot air, the second heater heating the stator from a side of the outer surface of the coil end portion, wherein the stator is heated by the first heater and the second heater.

Claims

1. A stator heating apparatus comprising:

a support that supports a stator in which a stator coil is mounted to a stator core and that is driven by a rotary to rotate the stator;

a first heater that includes an induction coil inserted into a cavity portion provided at an axial center of the stator core of the stator supported by the support to be disposed to heat the stator through induction heating, the first heater heating the stator from a radially inner side of the stator; and

a second heater that includes a hot-air outlet port that blows hot air toward an outer surface of a coil end portion of the stator supported by the support to heat the stator using the hot air, the second heater heating the stator from a side of the outer surface of the coil end portion, wherein

the stator is heated by the first heater and the second heater, the second heater outputs heat via the hot-air outlet port, and the hot-air outlet port is adjacent to the coil end portion of the stator, the support supports the stator while grasping a radially outer side of the stator, and wherein the support is located radially outside of the stator.

2. The stator heating apparatus according to claim 1, wherein

the stator is heated from the side of the outer surface of the coil end portion by the second heater while being heated from the radially inner side of the stator by the first heater.

3. The stator heating apparatus according to claim 2, wherein

the second heater includes a hot-air nozzle provided with the hot-air outlet port at a distal end, and a cover provided on an outer peripheral side of the hot-air nozzle and disposed so as to cover the side of the outer surface of the coil end portion when heating the stator;

and

the hot-air nozzle is configured such that the distal end of the hot-air nozzle is directed toward the outer surface of the coil end portion inside the cover when heating the stator.

4. The stator heating apparatus according to claim 2, further comprising:

a first mover that advances and retracts the first heater between an inside and an outside of the cavity portion; and

a second mover that advances and retracts between an operation position in the vicinity of the coil end portion and a retracted position.

5. The stator heating apparatus according to claim 4, wherein the second heater includes, as the hot-air outlet port, a first hot-air outlet port

corresponding to the coil end portion which projects toward one side, in an axial direction, from the stator core, and a second hot-air outlet port corresponding to the coil end portion which projects toward an other side, in the axial direction, from the stator core;

the first hot-air outlet port is advanced and retracted between the operation position in the vicinity of the coil end portion and the retracted position by the second mover; and

the second hot-air outlet port is integrally attached to the first heater, and advanced and retracted between the operation position in the vicinity of the coil end portion and the retracted position by the first mover together with the first heater.

6. The stator heating apparatus according to claim 4, wherein

the second heater includes a hot-air nozzle provided with the hot-air outlet port at a distal end, and a cover provided on an outer peripheral side of the hot-air nozzle and disposed so as to cover the side of the outer surface of the coil end portion when heating the stator;

and

the hot-air nozzle is configured such that the distal end of the hot-air nozzle is directed toward the outer surface of the coil end portion inside the cover when heating the stator.

7. The stator heating apparatus according to claim 4, wherein

the support is disposed between both end surfaces, in the axial direction, on an outer peripheral side of the stator core.

8. The stator heating apparatus according to claim 4, wherein

the support supports the stator by clamping both ends of a fixation lug portion provided on the stator core to project toward the radially outer side.

9. The stator heating apparatus according to claim 1, further comprising:

a first mover that advances and retracts the first heater between an inside and an outside of the cavity portion; and

a second mover that advances and retracts between an operation position in the vicinity of the coil end portion and a retracted position.

10. The stator heating apparatus according to claim 9, wherein

the second heater includes, as the hot-air outlet port, a first hot-air outlet port corresponding to the coil end portion which projects toward one side, in an axial direction, from the stator core, and a second hot-air outlet port corresponding to the coil end portion which projects toward an other side, in the axial direction, from the stator core;

the first hot-air outlet port is advanced and retracted between the operation position in the vicinity of the coil end portion and the retracted position by the second mover; and

the second hot-air outlet port is integrally attached to the first heater, and advanced and retracted between the operation position in the vicinity of the coil end portion and the retracted position by the first mover together with the first heater.

11. The stator heating apparatus according to claim 1, wherein

the second heater includes a hot-air nozzle provided with the hot-air outlet port at a distal end, and a cover provided on an outer peripheral side of the hot-air nozzle and disposed so as to cover the side of the outer surface of the coil end portion when heating the stator;

and

the hot-air nozzle is configured such that the distal end of the hot-air nozzle is directed toward the outer surface of the coil end portion inside the cover when heating the stator.

12. The stator heating apparatus according to claim 1, wherein

the support is disposed between both end surfaces, in the axial direction, on an outer peripheral side of the stator core.

13. The stator heating apparatus according to claim 1, wherein

the support supports the stator by clamping both ends of a fixation lug portion provided on the stator core to project toward the radially outer side.

14. The stator heating apparatus according to claim 2, wherein

the support is disposed between both end surfaces, in the axial direction, on an outer peripheral side of the stator core.

15. The stator heating apparatus according to claim 2, wherein

the support supports the stator by clamping both ends of a fixation lug portion provided on the stator core to project toward the radially outer side.

16. A stator heating method comprising:

heating a stator, in which a stator coil is mounted to a stator core, from a radially inner side of the stator using a first heater, the stator being supported by a support and rotated by drive of the support by a rotary, and the first heater including an induction coil inserted into a cavity portion provided at an axial center of the stator core to be disposed to heat the stator through induction heating; and

heating the stator from a side of an outer surface of a coil end portion of the stator using a second heater, the second heater including a hot-air outlet port that blows hot air toward the outer surface of the coil end portion to heat the stator using the hot air,

wherein the second heater outputs heat via the hot-air outlet port, and the hot-air outlet port is adjacent to the coil end portion of the stator, and

wherein the stator is supported by the support while being grasped on a radially outer side of the stator, the stator is rotated by drive of the support by the rotary, and wherein the support is located radially outside of the stator.