Insulating production process method of large alternating current machine stator core stretching screw

Abstract

The invention relates to an insulating production process method of a large alternating current machine stator core stretching screw. Insulation treatment is carried out between the stretching screw and an end plate of a stamped steel so as to guarantee the reliability of insulation. The insulating strength among the stretching screw, the end plate and the stamped steel can be effectively protected by using an insulating structure. The insulating process method of a stator core stretching screw comprises the steps of strengthening the mechanical strength of an insulating material; wrapping nickel hydrazine nitrate (NHN) composite foil with a high mechanical strength on both ends of the screw, wherein the diameter of the polish rod part in the middle of the screw is less than the major diameter of threads on both ends; sheathing a glass fiber sleeve with a low mechanical strength, with the threaded area on both ends bearing extrusion force; and tightly wrapping both ends of the sleeve in a condition that the sleeve is stretched. In order to avoid reduction of insulating resistance in the production process, a bakelite shim is arranged after being dipped by paint.

Description

technical field

[0001] The invention relates to a manufacturing process for stator core insulation of a motor, specifically referring to a process for insulating a tightening screw of a stator core of a large-scale AC motor; Moreover, it is convenient to assemble, easy to replace, economical and practical, and is especially suitable for pulling screw insulation of iron cores of various large-scale AC motors. The invention also relates to an anti-rotation tooling. Background technique

[0002] For large AC motors, the stator core is made of stacked fan-shaped punches. In order to ensure the integrity after stacking, all fan-shaped punches are fastened from the yoke of the punch with a tension screw. But if there is no reliable insulation between the screw and the punch, a loop will be formed between the screw and the punch, and an eddy current will be generated under the alternating magnetic flux. The higher the frequency of the motor, the more serious the eddy current. In t...

Examples

Embodiment Construction

[0023] The present invention will be further described below in conjunction with the examples.

[0024] The invention discloses a process method for making insulation of a tightening screw rod of a stator core of a large AC motor. In order to ensure the reliability of the insulation, an insulation treatment is performed between the tightening screw rod and a stamped end plate. An insulation structure effectively protects the insulation strength between the tension screw rod, the end plate and the punching piece. The adopted stator core tightening screw insulation process method includes the following steps:

[0025] 1. NHN composite foil with a thickness of 0.24mm is used. The composite foil is first cut into rectangular pieces of size 88×60.

[0026] 2. Apply adhesive sealant (such as Loctite 243) to one end of the tightening screw at a fixed position, screw in the nut, and stop until the nut is 6±0.5mm from the end face of the tightening screw.

[0027] 3. At the posit...

technical field

[0001] The invention relates to a manufacturing process for stator core insulation of a motor, specifically referring to a process for insulating a tightening screw of a stator core of a large-scale AC motor; Moreover, it is convenient to assemble, easy to replace, economical and practical, and is especially suitable for pulling screw insulation of iron cores of various large-scale AC motors. The invention also relates to an anti-rotation tooling. Background technique

[0002] For large AC motors, the stator core is made of stacked fan-shaped punches. In order to ensure the integrity after stacking, all fan-shaped punches are fastened from the yoke of the punch with a tension screw. But if there is no reliable insulation between the screw and the punch, a loop will be formed between the screw and the punch, and an eddy current will be generated under the alternating magnetic flux. The higher the frequency of the motor, the more serious the eddy current. In t...

Examples

Embodiment Construction

[0023] The present invention will be further described below in conjunction with the examples.

[0024] The invention discloses a process method for making insulation of a tightening screw rod of a stator core of a large AC motor. In order to ensure the reliability of the insulation, an insulation treatment is performed between the tightening screw rod and a stamped end plate. An insulation structure effectively protects the insulation strength between the tension screw rod, the end plate and the punching piece. The adopted stator core tightening screw insulation process method includes the following steps:

[0025] 1. NHN composite foil with a thickness of 0.24mm is used. The composite foil is first cut into rectangular pieces of size 88×60.

[0026] 2. Apply adhesive sealant (such as Loctite 243) to one end of the tightening screw at a fixed position, screw in the nut, and stop until the nut is 6±0.5mm from the end face of the tightening screw.

[0027] 3. At the posit...