VARNISH IMPREGNATION APPARATUS AND VARNISH IMPREGNATION METHOD

• US 20160126816A1
• Filed: 06/11/2014
• Published: 05/05/2016
• Est. Priority Date: 07/12/2013
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: KATO, Susumu, MAEDA, Shigeru, YOKOYAMA, Takeshi, KIMURA, Hideaki, NIWA, Tsuyoshi, SUGIMOTO, Takamitsu
• Granted Patent: US 10,148,158 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B05C 13/02 for particular articles
• CPC Class Codes: B05C 9/14 the auxiliary operation involving heating or cooling
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 15/125 Heating or drying of machines in operational state, e.g. standstill heating

Abstract

A varnish impregnation apparatus that includes a support that supports a stator, in which the stator coil is mounted to the stator core, with an axial direction of the stator directed in a horizontal direction while grasping a radially outer side of the stator, and that is rotationally driven by a rotary device to rotate the stator; a varnish dropping device that drops the varnish toward a coil end portion of the stator which is rotated while being supported by the support; and a heater disposed in a cavity portion provided at an axial center of the stator core of the stator supported by the support to heat the stator from a radially inner side of the stator.

Claims

1-19. -19. (canceled)

20. A varnish impregnation apparatus that impregnates a stator coil mounted to a stator core, in which a slot opens toward a radially inner side, with varnish, comprising:

a support that supports a stator, in which the stator coil is mounted to the stator core, with an axial direction of the stator directed in a horizontal direction while grasping a radially outer side of the stator, and that is rotationally driven by a rotary device to rotate the stator;

a varnish dropping device that drops the varnish toward a coil end portion of the stator which is rotated while being supported by the support; and

a heater disposed in a cavity portion provided at an axial center of the stator core of the stator supported by the support to heat the stator from a radially inner side of the stator.

21. The varnish impregnation apparatus according to claim 20, wherein

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

22. The varnish impregnation apparatus according to claim 20, wherein

the heater and the stator supported by the support are relatively movable such that the heater is disposed in one of a space inside the cavity portion and a space outside the cavity portion.

23. The varnish impregnation apparatus according to claim 21, wherein

the heater and the stator supported by the support are relatively movable such that the heater is disposed in one of a space inside the cavity portion and a space outside the cavity portion.

24. The varnish impregnation apparatus according to claim 22, wherein

the heater is advanceable and retractable between the space inside the cavity portion and the space outside the cavity portion.

25. The varnish impregnation apparatus according to claim 23, wherein

the heater is advanceable and retractable between the space inside the cavity portion and the space outside the cavity portion.

26. The varnish impregnation apparatus according to claim 22, wherein

the stator supported by the support is advanceable and retractable between a heating position, at which the heater is disposed in the cavity portion, and a retracted position, at which the heater is not disposed in the cavity portion.

27. The varnish impregnation apparatus according to claim 23, wherein

the stator supported by the support is advanceable and retractable between a heating position, at which the heater is disposed in the cavity portion, and a retracted position, at which the heater is not disposed in the cavity portion.

28. The varnish impregnation apparatus according to claim 20, wherein

the varnish dropping device and the stator supported by the support are relatively movable such that the varnish dropping device is disposed at one of a dropping position in the vicinity of the coil end portion of the stator and a retracted position.

29. The varnish impregnation apparatus according to claim 28, wherein

the varnish dropping device is advanceable and retractable between the dropping position in the vicinity of the coil end portion of the stator supported by the support and the retracted position.

30. The varnish impregnation apparatus according to claim 29, wherein

the retracted position of the varnish dropping device is located below the stator supported by the support.

31. The varnish impregnation apparatus according to claim 20, wherein

the support is at the same position when the varnish is dropped by the varnish dropping device and when the stator is heated by the heater.

32. The varnish impregnation apparatus according to claim 20, wherein

the heater includes an induction coil that heats the stator through induction heating.

33. The varnish impregnation apparatus according to claim 20, further comprising:

a second heater disposed in the vicinity of the coil end portion of the stator supported by the support to heat the coil end portion.

34. The varnish impregnation apparatus according to claim 33, wherein

the second heater heats the coil end portion by blowing hot air toward an outer surface of the coil end portion.

35. The varnish impregnation apparatus according to claim 20, wherein

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

36. A varnish impregnation method for impregnating a stator coil mounted to a stator core, in which a slot opens toward a radially inner side, with varnish, the varnish impregnation method comprising:

heating a stator, in which the stator coil is mounted to the stator core and which is supported with an axial direction of the stator directed in a horizontal direction with a support grasping a radially outer side of the stator, from a radially inner side of the stator using a heater disposed in a cavity portion provided at an axial center of the stator core;

dropping the varnish toward a coil end portion of the stator using a varnish dropping device, the stator being supported with the axial direction directed in the horizontal direction with the support grasping the radially outer side and being rotated with the support rotationally driven by a rotary device with the heater retracted from the cavity portion, the varnish dropping being performed after the heating of the stator; and

heating the varnish dropped onto the coil end portion using the heater to cure the varnish with the stator supported with the axial direction directed in the horizontal direction with the support grasping the radially outer side of the stator and with the heater disposed in the cavity portion, the heating the varnish being performed after the varnish dropping.

37. The varnish impregnation method according to claim 36, wherein

the support is at the same position when the varnish is dropped by the varnish dropping device and when the stator is heated by the heater.

38. The varnish impregnation method according to claim 36, wherein

the heating the stator includes heating the coil end portion using a second heater disposed in the vicinity of the coil end portion of the stator supported by the support;

the dropping the varnish includes dropping the varnish toward the coil end portion of the stator supported by the support with the second heater retracted from the vicinity of the coil end portion; and

the heating the varnish includes heating the varnish dropped onto the coil end portion to cure the varnish using the heater and the second heater with the heater disposed in the cavity portion and with the second heater disposed in the vicinity of the coil end portion.

39. The varnish impregnation method according to claim 38, wherein

dropping the varnish includes dropping the varnish toward the coil end portion with the heater retracted from the cavity portion, with the second heater retracted from the vicinity of the coil end portion, and with the varnish dropping device disposed in the vicinity of the coil end portion.