JPS5895963A - Treating method for insulation coil of electric machine - Google Patents

Abstract

PURPOSE:To perform the check of the quality in the step of manufacturing a coil for an electric machine by dipping the coil in aqueous soluble varnish while applying a voltage between the heated and dried coil and the varnish contained in a varnish tank. CONSTITUTION:A coil 2 for an electric machine is heated and dried in the first step. Then, a varnish tank 5 is then raised or lowered in the second step, thereby dipping from the coil end 2b, a core 1, and a coil end 2a in aqueous soluble varnish 4. At this time a small level voltage is simultaneously applied by an electric device 6 between a coil end lead 3 and the varnish 4. Thereafter, the varnish adhered to unnecessary part and dropped varnish are treated in the third step, and the coil 2 is then heated and cured. In this manner, the damaged defective part of the film can be grasped in the step of treating the varnish insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides $1 for conductors! The present invention relates to a method for insulating an electric machine winding using a water-soluble varnish.

TECHNICAL BACKGROUND OF THE INVENTION Conventionally, various magnet wires widely used in electric S+TSS such as rotary electric machine stator windings function as electromagnetic windings when combined with magnetic iron cores, but their electrical
Insulating varnish treatment is intended to ensure mechanical properties. What is important about this insulating varnish treatment is that it must be effective as a countermeasure against damage to the wire coating caused by pinholes allowed in the magnet wire itself and stress applied during the winding process. It is a point. In other words, damage to the coating of the electrical windings,
When electrical equipment is actually used, pinholes and the like can cause the insulation function to deteriorate in these areas due to contamination and heat absorption, leading to dielectric breakdown, or to a decrease in safety due to a decrease in insulation resistance. This is because it is an important interfusion that is directly connected to this.

-1. Understanding the condition of these magnet wire coatings before the above-mentioned insulating varnish treatment will help you know the melting point during the process. For example, it is possible to improve jigs and processing methods based on damage, position, etc. It becomes possible to implement countermeasures. In addition, it is necessary to confirm whether effective insulation treatment has been carried out during the insulation varnish treatment process. Tsuma I),
The magnet wire is completely bonded with insulating varnish to provide insulation S* with no conductor tangling.

The key point of the background technology is that the current technology for performing such NIm is a common test method that includes insulation resistance measurement, withstand voltage, hook voltage decontrol, resistance measurement, impedance measurement, etc. However, in these tests, it is not possible to grasp the pinholes and processing costs of [1111] individually; if it withstands it, it passes, and if it does not, it fails, or whether it is against the standard value. Applies to making judgments. In addition, as a special method, there is a method in which voltage is applied to a material in vacuum and detection is performed based on the state of discharge (% open/open 5O-154701), and a method in which high voltage is applied only to the surface of the winding wire is used. Methods of gluing the material on the surface or moving it to the location where the discharge occurs are known, but these methods have not been adopted because they are time and cost-effective, i.e. economical, and are not industrially viable. do not have.

In recent years, there has been a strong demand for the development of new technologies in connection with green automation, particularly regarding methods of continuously obtaining data on coatings and data on the effectiveness of insulation treatments.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide information 1i1 (data) such as pinholes in the magnet wire used and damage during processing to the electrical winding. In addition to understanding this during the manufacturing process and implementing appropriate countermeasure instructions or checking the quality of the coating itself, the effectiveness of insulating varnish treatment, along with the number of treatments, can be used as information for determining the suitability of varnish concentration and number of treatments regarding IM. It is an object of the present invention to provide an economical method for insulating electrical machinery windings, which enables quality control.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a process for insulating a four-wire S* using a magnet wire formed in one field (two hinoki) using a water-soluble varnish. A first step of heating and drying the electrical machine winding, and applying a voltage between the electrical machine winding obtained by this first step and a water-soluble varnish stored in a varnish tank.
Insulation treatment is performed in each step of the second step of immersing * in a water bath varnish, and the $3 step of heating and hardening the electric machine winding obtained from step 2, to remove distortion expansion defects. It is characterized by detecting the part electrically.

Practical Example of the Invention Hereinafter, one embodiment shown in the drawings of this book will be described. FIG. 1 is a flowchart showing an insulating varnish treatment process according to the present invention. In other words, the electrical machine winding to be processed (here, the example is the rotating 4EJII stator S wire)
a first step of heating and drying the electric wire, and immersing the electric machine winding in the water-soluble varnish while applying magnetic pressure between the electric wire obtained by this first step and the water-soluble varnish stored in the varnish tank. The process of 's2 and this '! This process consists of a process of 11g3 in which the electrical winding wire obtained by the process of J&2 is treated with varnish and sagging is treated and then heated and cured.

FIG. 22 shows a specific configuration example for carrying out the above second step.
The winding end 2m of the winding 2 assembled in the winding end 2m, the winding end lead 3 on the -1 side 2a of 2b, and the inside of the varnish tank 5; In between, an electric device 6 is configured to apply a more minute voltage and electrically detect changes in current.

Here, the electrical device 6 is basically the same as an insulation resistance needle or a tester. 1. Examples of the water-soluble varnish 4 include (U.S. 80HIINIIOTADY, O
AQUANI made by Hi1MIOmuL8! L-700,
600 etc.).

Next, the insulation treatment method will be described. First, in the first step, the electric machine 1f@J is heated and dried. Next, as a second step, the varnish tank 5 is moved down or the object to be treated is lowered to stir the iron core 1, the S-line end 2, and the water-soluble varnish 4 from the winding end 2b. At the same time, a small voltage is applied between the S edge lead 3 and the water-soluble varnish 4 from the electrical device 6. Thereafter, in a third step, after the varnish adhering to unnecessary portions is removed and the sagging is removed, the electrical machine winding 2 is heated and hardened.

In this insulation treatment process, if there is a point where the coating of the strands is ms and the conductor is protruding at the position shown in the figure on the winding end 2a side of the electric winding 2, the water-soluble varnish 4 is applied. Since it is electrically conductive, the winding end lead 3 and the water-soluble varnish 4 are electrically connected at the varnish level position of 0 parts or more, and the damage is prevented from being damaged by the voltage applied during this time. can be detected as a change in In this case, if the degree of rise tlA in the direction of the varnish 4 or the rate of descent of the object to be treated is kept constant, the position of the damage can be detected.

Furthermore, by changing the orientation of the object to be processed, it is possible to obtain information that can be applied to more positions.

- As mentioned above, this method detects damaged and defective parts of the coating during the water-soluble varnish treatment, but the same applies when repeating the above steps, that is, when performing multiple varnish treatments. It is. In other words, it is possible to confirm whether the defective portion detected during the first water-soluble varnish treatment has been completely covered with the insulating varnish 4 during the second treatment. Also, even if there are multiple defects, the first
What can be detected in the first processing is the position in contact with the water-soluble varnish 4, but after the second processing, even if the defect in the first processing is covered, the defect in C:@ is detected. In other words, the varnish insulation treatment effect Mv! This makes it possible to perform complete insulation treatment.

As mentioned above, this method utilizes the electrical conductivity characteristic of water-soluble varnish to detect pinholes and damage defects that are harmful to the insulation function of wire concentrators at a level that cannot be detected with conventional general tests. Even if there is, it is possible to understand the whole thing very effectively. As a result, checking the entire S-line surface, which was considered difficult in the past, can be realized without the need for special equipment or methods, and can be used as information for quality control in the process, which is the basis of process improvement (=directly linked). This makes it possible to obtain an extremely reliable and economical four-machine S-line.

The following is a summary of the effects of this legal district:
Two.

(1) 1 liter of Shijidenki windings before varnish insulation treatment (:
Electrical defects with a given conductor can be identified in the varnish insulation treatment process, and from the results, process improvements and countermeasures can be taken to improve the process before the siI process (2), and can be used as quality improvement measures.

(2) When varnishing is performed multiple times (second), the covering effect of varnishing can be confirmed and can be used as adjustment data for the varnish concentration and number of treatments.

(3) The method does not require special equipment and can be accomplished within the manufacturing process.

(4) Immersion method 6 Since the second insulation treatment is performed, the entire surface of the winding is covered and highly reliable data can be obtained.

(5) Fire safety measures when using varnish, which melts for two seconds (Secondly, with water-soluble varnish, there is no risk of ignition or ignition during immersion, so no special assignment is required.

Incidentally, in the above embodiment, the stator of a rotating electric machine was described, but when water-based varnish is used, it is possible to apply this method to all winding ends.

As described in detail about the invention, according to the present invention (2), information (data) on the pinholes of the gunnet wire and damage force during processing are grasped during the wrinkling process of the electrical winding. If you carry out appropriate countermeasure instructions or check the quality of the coating itself, check the effectiveness of the insulating wafer treatment along with the number of times (2 ails to determine the suitability of the varnish concentration and the number of times). It can be used as information for quality control: An economical (two advantageous) wire disconnection treatment method for electrical machine windings can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a flowchart and a schematic diagram showing one embodiment of the present invention. 1... Iron core, 2... Electrical winding, Im, 2b... Winding end, 3... Winding @ end lead, 4... Water-soluble varnish,
5...Varnish tank, 6...Folding device. Applicant's agent Patent attorney Takeshi Suzue Kyokan/Figure 2m 1

Claims (1)

[Claims] In the process of insulating an electric MS wire using a magnet wire formed by forming a film on a conductor using a water-soluble varnish, a first step of heating and drying the electric machine S wire to be treated; a second step of immersing the Mtl machine winding in the water-soluble varnish while applying a voltage between the electrical machine winding and the water-soluble varnish contained in the varnish bath; A method for insulating an electrical machine winding, comprising a third step of heating and hardening the electrical machine winding obtained by the process.