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Method for preparing low-resistance corona-prevention belt of high-voltage motor

A high-voltage motor, anti-corona technology, applied in the shape/style/structure of winding insulation, winding insulation materials, etc., can solve the problems of shortening motor operating life, low resistivity, discharge corrosion, etc., to avoid corona discharge corrosion, The effect of stable surface resistance value and improved operating life

Inactive Publication Date: 2008-10-15
王翠苓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, low-resistance anti-corona materials are used for the straight line of the stator coil of a high-voltage motor, and most of them are semi-cured (not completely dried) or brushed with low-resistance paint. Cause quality accidents such as unstable surface resistivity, exceeding the standard, and polluting the main insulating impregnating paint
In addition, after the coil is embedded in the stator slot, the linear low-resistance layer of the coil is in poor contact with the slot wall, and a large voltage difference (slot potential) will be generated between the uncontacted part and the slot wall
The surface resistivity of the low-resistance layer of the coil is high, and when the electric field strength generated between the uncontacted part of the surface and the stator core slot is greater than the electric strength of the air, corona and discharge corrosion will occur on the surface of the low-resistance layer of the coil and the slot wall; The surface resistivity of the resistance layer is low, and a large current will pass along the surface of the coil, causing the main insulation of the coil to be burned, which may easily cause a major accident of the motor grounding, and greatly shorten the operating life of the motor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0010] Specific embodiment one: the steps of preparing low-resistance anti-halation tape in this embodiment are as follows:

[0011] Step 1. Use 0.06±0.02mm×25mm electrical non-alkali glass fiber braided belt or polyester non-woven fabric belt;

[0012] Step 2, adopting single or mixed epoxy, phenolic or polyester resin by weight percent by 18%~45%, toluene, alcohol and acetone are by weight percent the composite solvent of 82~55%, the ratio of toluene, alcohol and acetone 1:1:1, prepare mother liquor, then add 15-30% graphite, 2-8% carbon black and 2-5% vegetable oil regulator to the mother liquor according to the weight percentage of the mother liquor, and stir to form a uniform liquid ;

[0013] Step 3. Put the non-alkali glass silk braid or polyester non-woven fabric tape for electricians in step 1 into the tank filled with the liquid prepared in step 2, and stir continuously with an electric stirrer to make the liquid in the tank even and free Precipitation, so that the...

specific Embodiment approach 2

[0015] Specific embodiment two: what step two of the present embodiment is different from specific embodiment one is that by weight percentage is 18%, toluene, alcohol and acetone are the composite solvent of 82% by polyester resin, and the ratio of toluene, alcohol and acetone is 1:1:1, prepare mother liquor, then add 15% graphite, 8% carbon black and 2% vegetable oil regulator to the mother liquor according to the weight percentage of the mother liquor, and stir to form a uniform liquid. The surface resistivity is between 200Ω and 800Ω. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: what step two of the present embodiment is different from specific embodiment one is that by weight percentage, be 30% by phenolic formaldehyde and polyester resin, toluene, alcohol and acetone are 70% composite solvent, toluene, alcohol and acetone The ratio is 1:1:1, and it is prepared into a mother liquor, and then 22% of graphite, 4% of carbon black and 3.5% of vegetable oil regulator are added to the mother liquor according to the weight percentage of the mother liquor, and stirred into a uniform liquid. The surface resistivity is between 1000Ω and 4000Ω. Other steps are the same as in the first embodiment.

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PUM

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Abstract

This invention relates to high voltage motor and low resistance anti-air process method, which comprises the following steps: adopting alkali-free glass band or polyester cloth band; b, single or mixture oxygen, phenol aldehyde or polyester resin, toluene alcohol and acetone to form parent liquid and then adding it with black lead, carbon and plant oil adjusting agent for mixing into even liquid; c, putting the matched liquid into tank for dipping; d, putting the band diped with liquid into gap yoke machine then into drying furnace to process low anti-air band.

Description

technical field [0001] The invention relates to a preparation method of an anti-corona belt for a motor. Background technique [0002] At present, low-resistance anti-corona materials are used for the straight line of the stator coil of a high-voltage motor, and most of them are semi-cured (not completely dried) or brushed with low-resistance paint. Cause quality accidents such as unstable surface resistivity, exceeding the standard and polluting the main insulating impregnation paint. In addition, after the coil is embedded in the stator slot, the linear low-resistance layer of the coil is in poor contact with the slot wall, and a large voltage difference (slot potential) will be generated between the uncontacted part and the slot wall. The surface resistivity of the low-resistance layer of the coil is high, and when the electric field strength generated between the uncontacted part of the surface and the stator core slot is greater than the electric strength of the air, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/40H02K3/30
Inventor 王翠苓
Owner 王翠苓