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Insulation treatment method for rotor core

A technology of insulation treatment and rotor core, applied in the direction of metal material coating process, etc., can solve the problems of unfavorable motor working efficiency, rotor core loss and high load stray loss

Inactive Publication Date: 2015-07-08
江苏王牌电机制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact resistance between the existing rotor bars and the iron core is generally less than 10 ohms, resulting in high rotor core loss and load stray loss, which is not conducive to improving the working efficiency of the motor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: First prepare a phosphating solution, the component ratio is 41g / liter of muffle salt, 3g / liter of sodium fluoride, 63g / liter of zinc nitrate and the remaining pure water, and the iron core is placed in a phosphating solution of 77 degrees. React in the liquid for 14 minutes, then wash and saponify the iron core in 3% soapy water, and finally wash it with clean water and then dry it. A dense phosphate film is formed on the rotor core slot wall. The thickness of the phosphate film is 0.01mm, and the film resistance value is about 60 ohms. Compared with the existing contact resistance between the rotor bar and the iron core, it is generally less than 10 ohms. It can directly improve the contact resistance between the rotor bar and the iron core, reduce the rotor loss and improve the working efficiency of the motor.

Embodiment 2

[0016] Embodiment 2: first prepare a phosphating solution, the component ratios are 45g / liter of muffle salt, 4g / liter of sodium fluoride, 65g / liter of zinc nitrate and the remaining pure water, and the iron core is placed in a phosphating solution of 80 degrees. React in the liquid for 15 minutes, then wash and saponify the iron core in 3% soapy water, and finally wash it with clean water and then dry it. A dense phosphate film is formed on the groove wall of the rotor iron core. The thickness of the phosphate film is 0.012mm, and the film resistance value is about 55 ohms. Compared with the existing contact resistance between the rotor bar and the iron core, it is generally less than 10 ohms. It can directly improve the contact resistance between the rotor bar and the iron core, reduce the rotor loss and improve the working efficiency of the motor.

Embodiment 3

[0017] Embodiment three: first prepare phosphating solution, the component ratio is 40g / liter of muffle salt, 2g / liter of sodium fluoride, 60g / liter of zinc nitrate and the pure water of surplus, and the iron core is placed in the phosphating solution of 70 degrees. React in the liquid for 10 minutes, then wash and saponify the iron core in 3% soapy water, and finally wash it with clean water and then dry it. A dense phosphate film is formed on the rotor core slot wall. The thickness of the phosphate film is 0.008mm, and the film resistance value is about 40 ohms. Compared with the existing contact resistance between the rotor bar and the iron core, it is generally less than 10 ohms. It can directly improve the contact resistance between the rotor bar and the iron core, reduce the rotor loss and improve the working efficiency of the motor.

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Abstract

The invention discloses an insulation treatment method for a rotor core. The method comprises the following steps: step 1, preparing a phosphating solution, wherein the phosphating solution comprises 40 to 45 g / L of manganese dihydrogen phosphate, 2 to 4 g / L of sodium fluoride, 60 to 65 g / L of zinc nitrate, with the balance being water; step 2, placing the rotor core in the phosphating solution with a temperature of 70 to 80 degrees for a reaction for 10 to 15 minutes, and then removing the rotor core out of the solution; step 3, washing the removed rotor core with soap water with a concentration of 3%; and step 4, subjecting the rotor core washed with the soap water with the concentration of 3% to cleaning with warm water again, and then carrying out drying. The insulation treatment method for the rotor core provided by the invention can improve contact resistance between a rotor bar and the rotor core, reduce the loss of the rotor and improve working efficiency of a motor.

Description

technical field [0001] The invention relates to an insulation treatment method for a rotor iron core. Background technique [0002] The outer circle of the rotor iron core of the motor is generally processed by a car, that is, the air gap of the car. Due to the iron cutting and burrs processed by turning, the surface of the rotor is connected into one piece, and the entire surface of the rotor becomes an integral passage. The resistance between the aluminum bar and the iron core of the cast aluminum rotor is called the contact resistance, and its value directly affects the magnitude of the lateral current. The contact resistance between the existing rotor bars and the iron core is generally less than 10 ohms, resulting in high rotor iron core loss and load stray loss, which is not conducive to improving the working efficiency of the motor. SUMMARY OF THE INVENTION [0003] In view of the deficiencies of the prior art, the present invention provides an insulation treatmen...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 朱荣杰黄演张承宁朱孝勇王静
Owner 江苏王牌电机制造有限公司