JP2005143182A - Process for impregnating with varnish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process for impregnating with varnish in which permeation of varnish into a wire led out from a coil is suppressed and workability of wiring can be enhanced by imparting flexibility to the lead wire. <P>SOLUTION: In the process for impregnating with varnish where an annular coil 9 is impregnated entirely with varnish 22 by dripping varnish 22 onto the coil 9 while rotating the stator core 10 of a motor arranged with the coil 9 and then the varnish 22 is dried, varnish is dripped to the root 18a of a wire 18 led out from the coil 9 before the entire coil is impregnated with varnish 22 and then the varnish 22 is dried preliminarily to form a varnish permeation preventive part 23. At the time of dripping varnish, the varnish permeation preventive part 23 serves as a barrier and retards permeation of varnish 22 into the lead wire 18 thus ensuring flexibility of the lead wire 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a varnish impregnation method in which an annular coil disposed in a motor core is impregnated with varnish, and more particularly, to a technique for suppressing penetration of varnish into a lead wire derived from the coil.

  For example, an annular coil disposed in a stator core of a motor is subjected to an insulation treatment in which the entire coil is impregnated to avoid a short circuit due to contact with a conductor and to reinforce the coil (see, for example, Patent Document 1). ).

To impregnate the coil with varnish, while rotating the stator core, dripping the varnish onto the end of the coil that protrudes outward from the stator core, so that the entire coil is impregnated with the varnish from the end of the coil using capillary action. I am letting.
JP 2003-189523 A (pages 3 and 4; FIGS. 1 and 2)

  However, in the method of dripping and impregnating the varnish described in Patent Document 1, the varnish is impregnated into the lead wire led from the coil through the coil wire by capillary action, and the flexibility of the lead wire is obtained by subsequent drying of the varnish. Lost.

  For this reason, when connecting the terminal attached to the tip of the lead wire to a terminal such as a power supply unit, it is difficult to handle the lead wire due to the varnish solidified by drying.

  Accordingly, an object of the present invention is to provide a varnish impregnation method capable of suppressing penetration of a varnish into a lead wire led out from a coil and enhancing the wiring workability by giving the lead wire flexibility. And

  Before the varnish dripping treatment to impregnate the entire coil with the varnish, after dripping the varnish to the root part of the lead wire led out from the coil, the varnish is pre-dried to form a varnish permeation preventing part Method.

  According to the varnish impregnation method of the present invention, before the varnish dripping treatment for impregnating the entire coil with the varnish, the varnish is dropped on the root portion of the lead wire led out from the coil, and then the varnish is pre-dried to prevent varnish permeation. Since the portion is formed, this varnish penetration preventing portion prevents penetration of the varnish into the lead wire in the subsequent varnish dripping treatment, and ensures the flexibility of the lead wire. Therefore, according to the present invention, the wiring work of the lead wire led out from the coil can be facilitated.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In the present embodiment, for example, the present invention is applied to a varnish impregnation method in which a coil of a driving motor of an automobile or the like is impregnated with varnish.

[Configuration of varnish impregnation equipment]
Before describing the varnish impregnation method of the present embodiment, a varnish impregnation apparatus used in the method of the present invention will be briefly described.

  FIG. 1 is a schematic configuration diagram of a varnish impregnation apparatus, and FIG.

  As shown in FIG. 1, the varnish impregnation apparatus 1 includes a varnish dropping unit 2 that drops varnish and a drying unit 3 that dries the varnish. The varnish dripping unit 2 has a rotation drive advance / retreat drive unit 4 on the apparatus base 5 that rotates the workpiece W and advances the workpiece W to the drying unit 3.

  As shown in FIG. 2, the rotation drive advance / retreat drive unit 4 includes a main shaft 6 that is rotated by a drive motor. A disc 7 is fixed to the tip of the main shaft 6. Further, several extension pins 8 projecting toward the drying unit 3 are provided on the outer peripheral edge of the disk 7 at equal intervals in the circumferential direction. The extension pin 8 has a base end portion which is movable in a direction in which the tip end side thereof approaches and separates from the inner surface of the stator core 10 on which the annular coil 9 which is the work W is disposed, and the outer peripheral portion of the disk 7. It is connected to.

  Further, a sub shaft 12 that is fastened and fixed by a screw portion 11 is provided at the tip of the main shaft 6. An extension disk 13 having a tapered surface 13 a that comes into contact with the tip of the extension pin 8 is attached to the auxiliary shaft 12. The disc 7 fixed to the main shaft 6 is provided with a cylindrical portion 14 that protrudes toward the sub shaft 12 side. The tip of the cylindrical portion 14 is inserted into an annular groove 15 formed in the expansion disk 13.

  In this varnish impregnation device, when the secondary shaft 12 is screwed into the main shaft 6, the tapered surface 13 a of the expansion disk 13 pushes the expansion pin 8 outward, and the expanded expansion pin 8 presses the inner surface of the stator core 10. By energizing, the stator core 10 is held on the main shaft 11.

  Further, this varnish impregnation apparatus has a nozzle holding bracket 16 above the main shaft 6. Four flexible varnish dropping nozzles 17 are attached to the nozzle holding bracket 16. All of these varnish dropping nozzles 17 are arranged directly above the coil end 9 a of the coil 9 protruding to the outside of the stator core 10.

[Varnish impregnation method]
Next, the varnish impregnation method of the present embodiment in which the coil 9 is impregnated with the varnish using the varnish impregnation apparatus 1 described above will be described.

  First, as shown in FIG. 2, several drops of varnish are dropped on the root portion 18a of the lead wire 18 led out from the coil end 9a. A crimp terminal 19 is attached to the tip of the lead wire 18. The varnish is dropped using, for example, a dropper. As the varnish to be dropped, for example, a liquid thermosetting resin, specifically, an epoxy resin or a polyester resin is used.

  Next, as shown in FIG. 3, for example, a yarn 20 containing glass fiber is wound around the root portion 18a of the lead wire 18 several times to perform yarn binding called racing. When the root portion 18a of the lead wire 18 is wound around and tied with the thread 20, the coil wire materials 21 come into close contact with each other and the varnish 22 enters the gaps between the coil wire materials 21 as shown in FIG.

  Next, the stator core 10 is attached to the main shaft 6 of the varnish impregnation device 1 described above, and is held and fixed to the main shaft 6 by the urging force of the expansion pin 8. Next, the rotational drive advance / retreat drive unit 4 is operated to cause the stator core 10 to enter the drying unit 3 described above. In the drying unit 3, preheating is performed while rotating the main shaft 6. In the preheating, the temperature in the furnace is raised to about 120 ° C. to heat the coil 9.

  As a result, the coil 9 wound in an annular shape releases the residual stress due to the winding by this preliminary heating. Further, when this preheating is performed, the varnish 22 dropped into the root portion 18 a of the lead wire 18 is gelled and hardened to form the varnish permeation preventing portion 23.

  Next, the rotational drive advance / retreat drive unit 4 is operated to take out the stator core 10 from the drying unit 3. In the state shown in FIG. 1, the varnish 22 is continuously dropped onto the coil end 9a from the varnish dropping nozzle 17 while rotating the stator core 10 by the rotation operation of the main shaft 6 of the rotary drive advance / retreat drive unit 4.

  When the varnish 22 is dropped on the coil end 9a, the varnish 22 penetrates the entire coil by capillary action. However, since the gelled varnish permeation preventing portion 23 is formed at the root portion 18 a of the lead wire 18, the varnish permeation preventing portion 23 serves as a barrier and travels through the coil wire 21 to the varnish 22 toward the leading end of the lead wire. Is prevented from penetrating.

  Next, when the varnish dripping process is completed, the rotational drive advance / retreat drive unit 4 is operated to cause the stator core 10 to enter the drying unit 3 again, and the varnish 22 is fully dried. The main drying of the varnish 22 is performed under conditions suitable for the varnish 22 to be used because the heating temperature and the heating time differ depending on the type of the varnish 22. When the main drying is completed, the rotary drive advance / retreat drive unit 4 is operated to take out the stator core 10 from the drying unit 3 and remove the stator core 10 from the main shaft 6. Finally, the stator core 10 is cooled.

[Effects of this embodiment]
According to the method of the present embodiment, before the varnish dropping process in which the entire coil is impregnated with the varnish 22, the varnish 22 is dropped on the root portion 18a of the lead wire 18 and the residual stress of the coil 9 is released during the preheating process. In addition, since the varnish penetration preventing portion 23 is formed by gelling the varnish 22, the varnish penetration preventing portion 23 serves as a barrier during the varnish dropping treatment to prevent the varnish 22 from penetrating into the lead wire 18. Can do. Thereby, the flexibility of the lead wire 18 is ensured, and the wiring operation of the lead wire 18 can be facilitated.

  In addition, since the preliminary drying of the varnish 22 is a process for releasing the residual stress generated by winding the coil wire 21 in a ring shape, it is a process necessary for the conventional varnish impregnation process. There is no additional process.

[Other embodiments]
Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

  In the above-described embodiment, the yarn 20 is wound around the root portion 18a of the lead wire 18 several times. However, as shown in FIGS. 5 and 6, the yarn 20 is wound around the root portion 18a of the lead wire 18. You may make it wind around every one. For example, as shown in this example, one yarn 20 is wound around the coil wire 21 one after another. The winding of the yarn 20 around the coil wire 21 is performed before the varnish dropping process in which the entire coil is impregnated with the varnish 22. By winding the lead wire 18, the penetration of the varnish 22 into the lead wire 18 can be prevented.

  Furthermore, in order to reliably prevent the penetration of the varnish 22 into the lead wire 18, several drops of the varnish 22 are dropped on the portion where the yarn 20 is wound, and then the stator core 10 is placed in the drying section 3 and preliminarily dried. As a result, as in the above-described embodiment, the varnish 22 is gelled and the varnish penetration preventing portion 23 is formed at the root portion 18 a of the lead wire 18. Therefore, also in this embodiment, the varnish permeation preventing portion 23 serves as a barrier, and the penetration of the varnish 22 into the lead wire 18 can be prevented, and the flexibility of the lead wire 18 can be ensured. it can.

It is a schematic block diagram of the varnish impregnation apparatus used with the method of this invention. It is a principal part expanded sectional view which expands and shows the workpiece | work attachment part of the varnish impregnation apparatus used with the method of this invention. It is a figure which shows the state which wound the thread | yarn several times around the root part of the lead wire. It is an expanded sectional view in the AA line position of FIG. It is a figure which shows the state which wound the thread | yarn around the root part of the lead wire for every coil wire. It is an expanded sectional view in the BB line position of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Varnish impregnation apparatus 2 ... Varnish dripping part 3 ... Drying part 9 ... Coil 9a ... Coil end 10 ... Stator core 18 ... Lead wire 20 ... Yarn 21 ... Coil wire 22 ... Varnish 23 ... Varnish penetration prevention part

Claims (4)

In the varnish impregnation method in which the varnish is dripped into the coil while the core of the motor in which the annular coil is arranged is dripped to impregnate the entire coil, and then the varnish is dried.
Before the varnish dripping treatment for impregnating the entire coil with varnish, after dripping the varnish to the root portion of the lead wire led out from the coil, the varnish is pre-dried to form a varnish permeation preventing portion. Varnish impregnation method. The varnish impregnation method according to claim 1,
A varnish impregnation method, comprising: dropping a varnish on a root portion of the lead wire; and winding a thread around the root portion of the lead wire. In the varnish impregnation method in which the varnish is dripped into the coil while the core of the motor in which the annular coil is arranged is dripped to impregnate the entire coil, and then the varnish is dried.
A varnish impregnation method characterized by winding a yarn around each coil wire rod at the root portion of a lead wire led out from the coil before varnish dripping treatment for impregnating the entire coil with varnish. A varnish impregnation method according to claim 3,
A varnish impregnation method, comprising: dripping varnish on a root portion of a lead wire around which the yarn is wound, and preliminarily drying the varnish.

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