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Method for twining VPI corona-prevention layer between stator coil main insulating layer and corona-prevention layer

A technology of stator coil and main insulating layer, applied in the shape/style/structure of winding insulation, manufacturing stator/rotor body, etc., can solve the problem of reducing the corona and withstand voltage performance of anti-corona layer, withstand voltage and creeping flashover voltage drop, the corona onset voltage of the end anti-corona layer is reduced, etc., to achieve the effect of uniform electric field

Inactive Publication Date: 2008-10-15
施之英
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that the resin impregnated in the main insulating layer is extruded into the end anti-corona layer after the main insulating layer VPI of the main stator coil of the existing high-voltage motor is impregnated with resin during the thermocompression molding process of the motor stator coil, and the anti-corona layer is changed. The resistance value of the anti-corona layer reduces the corona and withstand voltage performance of the anti-corona layer, and reduces the corona initiation voltage of the end anti-corona layer, resulting in a drop in withstand voltage and flashover voltage along the surface. The method of wrapping the VPI anti-corona barrier layer between the anti-corona layer, the specific technical scheme to solve the above problems is as follows:

Method used

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  • Method for twining VPI corona-prevention layer between stator coil main insulating layer and corona-prevention layer

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specific Embodiment approach 1

[0013] Specific implementation manner 1: This implementation manner is described in conjunction with FIG. 1 . The steps of this embodiment are as follows:

[0014] Step 1. Wrap several layers of the stator coil copper core guide rod 1 with less glue mica tape, with a thickness of 2.5-7.5mm;

[0015] Step 2, wrapping a layer of low-resistance band 2 made of semiconductor material in the slot of the stator coil;

[0016] Step 3. Vacuum pressure impregnating resin glue on the stator coil groove part wrapped with a layer of semiconductor material low-resistance tape (2) in step 2, and dripping dry;

[0017] Step 4. Wrap the outer surface of the end of the main insulating layer 5 impregnated with resin glue around the VPI anti-corona barrier layer 3. The anti-corona barrier layer 3 is made of multi-glue mica tape, the thickness of which is 0.1mm, and its glue content It is 35~45% of the mica tape, and the winding thickness of the anti-corona barrier layer 3 is 0.3~1mm; Bread PTF...

specific Embodiment approach 2

[0021] Specific Embodiment 2: This embodiment will be described in conjunction with FIG. 2 . The difference between this embodiment and the first embodiment is that the anti-halation barrier layer 3 in step four is composed of a polymica tape 8 and an alkali-free glass tape 7 . The upper and lower positions of the multi-glue mica tape 8 and the non-alkali glass tape 7 are interchangeable. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the winding thickness of the anti-corona barrier layer 3 in step four of this embodiment is 0.4 mm; in step five, the temperature in the hot-press curing furnace is raised to 130 ° C, kept for 4 hours, and then heated to 160 ° C, kept for 12 Hour. Other steps are the same as in the first embodiment.

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Abstract

This invention relates to stator coil set main insulation layer and anti-air block layer method, which comprises the following steps: a, covering on copper center conductive bar by mica bands; b, covering resistance band outside stator coils set; processing vacuum pressure dipping; d, coiling VPI anti-air insulation layer outside main insulation layer and putting stator coil into mode; e, putting fix furnace into shape; f, outside furnace for cooling then removing mode band.

Description

technical field [0001] The invention relates to a method for winding a VPI barrier layer between a main insulating layer and an anti-corona layer of a stator coil of a high-voltage motor. Background technique [0002] There is a high voltage difference between the end of the low-resistance anti-corona layer of the stator coil in the slot of the high-voltage motor and the end of the copper guide rod in the coil insulation, which will easily cause the electric field at the end of the low-resistance to concentrate, causing the potential to change abruptly, resulting in corona . The existing high-voltage motor stator coil main insulation layer VPI (VPI is the abbreviation of vacuum pressure impregnation resin process) is impregnated with resin, and the resin impregnated in the main insulation layer is squeezed into the anti-corona layer at the end during the thermoforming process of the motor stator coil. , changing the resistance value of the anti-corona layer, reducing the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/40H02K15/02
Inventor 施之英
Owner 施之英
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