JP4000187B2 - Method of removing insulation coating from coil end - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing an insulation coating on a coil end, and in particular, insulation of a coil end suitable for an ultra-high space factor coil in which a flat insulated wire (for example, a flat enameled wire) is spirally wound and laminated. The present invention relates to a coating removal method.
[0002]
[Prior art]
Recently, in response to the demand for miniaturization and thinning of motors and transformers, an ultra-high space factor coil has been developed in which flat insulated wires (for example, flat enameled wires) are spirally wound and laminated. FIG. 4 shows an example of a coil layout in the case of producing a flat motor field using such a coil. In this example, the field of a flat motor is comprised by arrange | positioning the six coils 1a-1f which have a substantially fan shape as a whole circularly. One of those coils is shown enlarged in FIG. As shown in the figure, this coil is formed by winding and laminating a tape-shaped rectangular enameled wire having a width of 5 mm and a thickness of 20 μm in a spiral shape so that the side surface has a substantially fan shape. In addition, 2 is the winding start end located on the inner peripheral surface of the coil, 3 is the winding end end located on the outer peripheral surface of the coil, and these coil terminals 2 and 3 are usually coil bodies even in the connected state. As shown in enlarged views in FIG. 6 and FIG. 7, it is kept in close contact with the coil body. This is because an extra space for connection is not formed on the inner and outer periphery of the coil. The thickness of the enamel coating of the flat enamel wire is approximately 3 μm, and the cross-sectional shape is an elongated rectangular shape. Therefore, the layers of the windings constituting the coil are in intimate contact with each other, and there is an advantage that the space factor is remarkably high compared to a coil using a round enameled wire having the same current capacity and number of turns. is there.
[0003]
By the way, in order to supply power to this type of high space factor coil, the enamel coating on the coil end must be peeled off. In FIG. 6, the area surrounded by the dotted line 2 a is the enamel peeling scheduled area at the winding start end 2, and the part surrounded by the dotted line 3 a in FIG. 7 is the enamel peeling scheduled area at the winding end end 3. As described above, this enamel coating peeling operation must be performed while the winding start end 2 and the winding end end 3 are closely attached to the coil body.
[0004]
Conventional enamel coating removal methods include (1) a method of removing the enamel coating on the coil end by corroding with chemicals, and (2) a method of manually scraping off the enamel coating on the coil end using a file or the like. Has been.
[0005]
[Problems to be solved by the invention]
However, in the method (1) for removing the enamel coating of the coil end by corroding with a chemical, as described above, the winding start end 2 and the winding end end 3 are in close contact with the coil body. Therefore, it is very difficult to attach corrosive chemicals only to the surface of the flat enamel wire on the outer peripheral surface of the coil, and often the corrosive chemical penetrates into the lower flat enamel wire, causing an interlayer short circuit. There is a problem to cause. On the other hand, even in the method (2) in which the enamel coating of the coil end is manually scraped off using a file or the like, it is extremely highly skilled for locally scraping only the surface coating of the flat insulated wire located on the surface layer. In addition to this, there is a problem that work takes time.
[0006]
The present invention has been made by paying attention to the above-described conventional problems, and the object of the invention is to reduce work man-hours by improving the work efficiency of the terminal covering peeling work in the coil using this type of flat insulated wire. Is to plan.
[0007]
[Means for Solving the Problems]
The method of the present invention is a method for removing an insulation coating on a coil terminal in a coil formed by winding a rectangular insulated wire in a spiral shape,
While the winding start end located on the inner peripheral surface of the coil and the surface of the winding end end located on the outer peripheral surface, the winding start end and the winding end end are in close contact with the coil body, by locally irradiating the laser beam, which is removed by sublimation of insulation material of the irradiated region with an energy of the laser beam, further
For the irradiation of the laser beam, a support base for supporting the coil in a fixed inclination posture is provided on the sample stage of the laser marker apparatus, and the relative positional relationship between the laser marker apparatus and the coil is determined. It is characterized by irradiating the inner peripheral surface and outer peripheral surface of the coil while irradiating the laser beam obliquely by moving each of them and changing them.
[0008]
According to such a configuration, since the laser beam is used for the removal of the insulating coating material , the insulation coating of the coil terminal can be removed accurately and quickly if only the irradiation region of the laser beam is appropriately managed . Moreover, there is no risk of interlayer short-circuiting due to the invasion of chemicals as in the case of using corrosive chemicals, and there is no need for skilled workers as in the case of manual work using files. In addition, after appropriately setting various parameters of the laser marker device, the relative positional relationship between the laser marker device and the coil can be easily set to the specified relationship simply by setting the target coil on the support base. In addition, the laser irradiation can be performed on the inner and outer peripheral surfaces of the coil under substantially the same conditions.
[0009]
Further, when irradiating the laser beam, it is preferable that a blindfold is projected from the side by a predetermined amount in the optical path of the laser beam from the laser marker device to the coil, and the scanning range of the laser beam is limited by the blindfold. .
[0010]
In this way, the scanning range of the laser beam can be limited not only by the parameter setting of the laser marker device but also by the projection amount of the blindfold, thereby controlling the laser beam irradiation range with higher accuracy. Further, it is possible to more reliably prevent a situation in which the coating on the coil side surface is excessively removed and an interlayer short circuit is caused.
[0011]
Furthermore, the present invention has a particularly remarkable effect when applied to an ultra-high space factor coil using a flat enameled wire. That is, since the terminal coating peeling work in this type of ultra-high space factor coil can be easily performed, the spread to electric devices such as flat motors and transformers is further promoted.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
As described above, the method of the present invention is a method for removing the insulation coating from a coil end of a coil formed by winding and winding flat rectangular insulated wires in a spiral shape, and is a winding start end located on the inner peripheral surface of the coil. In addition, the surface of the winding end located on the outer peripheral surface is locally irradiated with a laser beam while the winding start end and the winding end end are in close contact with the coil body. The insulating coating material in the irradiated region is removed by sublimation with the energy of the laser beam.
[0014]
Various laser beam irradiation devices can be used as the laser beam irradiation means, but so-called laser marker devices are the most suitable among the current products in consideration of the intensity of the required laser beam and operability when handling it. it is conceivable that. An example of the basic structure of the laser marker device is shown in FIG. In the laser marker device 4 shown in the figure, the laser beam 5 coming directly from the YAG laser oscillator or passing through the optical fiber is first incident on the X-axis rotating mirror 6 and then totally reflected there. The light is incident on the Y-axis rotating mirror 7, totally reflected by the mirror 7, and then condensed by the condenser lens 8 on the surface of the marking object (not shown) placed on the sample stage 9. The position of the laser beam spot on the sample stage 9 is uniquely determined by the angle of the X-axis rotating mirror 6 in the X direction and the angle of the Y-axis rotating mirror 7 in the Y direction. The X-axis rotating mirror 6 is rotated and oscillated in the directions of arrows A and A ′ by the X-axis galvanometer scanner 10. On the other hand, the Y-axis rotating mirror 7 is rotated and oscillated in the directions of arrows B and B ′ by the Y-axis galvanometer scanner 11. Both scanners 10 and 11 are given scanning control signals from a control unit (not shown) via electrical cables 12 and 13.
[0015]
In the above configuration, each time the pulsed laser beam 5 emitted from a YAG laser oscillator (not shown) arrives at a predetermined timing, both the scanners 10 and 11 set the both rotating mirrors 6 and 7 in a predetermined manner in synchronization therewith. By shaking at an angle, a laser beam spot is irradiated so as to draw an arbitrary locus on the surface of a marking object (in this example, a coil) placed on the sample stage 9. The irradiation trajectory of this laser beam spot is usually automatically controlled by a computer by teaching through various parameters.
[0016]
When the method of the present invention is carried out using the laser marker device having such a structure, the coil to be subjected to insulation coating removal is placed on the sample stage 9. As should be noted at this time, as apparent with reference to FIG. 5, the winding end 3 located on the outer peripheral surface of the coil can be irradiated with laser light vertically from directly above, whereas The winding start end 2 located on the peripheral surface can only be irradiated with laser light obliquely from above (first note). Furthermore, it should be noted that if the laser beam irradiation area (the area surrounded by the dotted lines 2a and 3a in FIGS. 6 and 7) is removed and the side surface of the coil is accidentally irradiated with the laser beam, the interlayer insulation is destroyed. This causes an interlayer short circuit (second precaution).
[0017]
Therefore, in the embodiment shown in FIG. 2 and FIG. 3, some ideas are adopted. That is, for the first point of caution, a support base 14 is provided on the sample stage 9 of the laser marker device so as to support the coil 1 in a fixed inclination posture, and the relative positional relationship between the laser marker device 4 and the coil 1 is provided. Is changed by moving the coil 1 together with the support 14 so that the inner peripheral surface and the outer peripheral surface of the coil 1 are locally irradiated with laser beams obliquely. More specifically, FIG. 2 shows a case where the insulation coating of the winding end 3 of the coil 1 is removed, and the laser beam 5 is irradiated obliquely from above the outer peripheral surface of the coil 1. On the other hand, FIG. 3 shows a case where the insulation coating at the winding start end 2 of the coil 1 is removed, and the laser beam 5 is irradiated obliquely from above to the inner peripheral surface of the coil 1. Since such a configuration is adopted, after various parameters of the laser marker device 4 are appropriately set, the laser marker device 4 and the coil 1 can be simply set by setting the target coil 1 on the support base 14. Can be easily set to a prescribed relationship, and laser irradiation can be performed on the inner and outer peripheral surfaces of the coil 1 under substantially the same conditions. As a laser beam scanning method, any method can be adopted as long as it fills the irradiation planned area (enclosed by dotted lines 2a and 3a) shown in FIGS. For example, it is possible to adopt a so-called one-stroke writing method in which the irradiation target region is filled with a large number of parallel lines, a so-called wobbling method in which a large number of arcs are overlapped while moving the center thereof, and the like.
[0018]
Next, with respect to the second precaution, the blind plate 15 is projected by a predetermined amount from the side of the optical path of the laser beam 5 from the laser marker device 4 toward the coil 1. The scanning range is limited. That is, in FIGS. 2 and 3, the blindfold plate 15 is supported so as to be slidable in the horizontal direction as indicated by arrows C and C ′, and by adjusting the protruding amount of the blindfold plate 15, The laser beam 5 intended to irradiate the side surface of the coil 1 can be reliably blocked. Since such a configuration is adopted, the scanning range of the laser beam can be limited not only by the parameter setting of the laser marker device 4 but also by the protrusion amount of the blindfold plate 15, thereby further reducing the irradiation range of the laser beam. By controlling with high accuracy, it is possible to more reliably prevent a situation in which the coating on the coil side surface is excessively removed and an interlayer short-circuit occurs.
[0019]
【Example】
A preferred embodiment of the present invention will be described below.
[0020]
(1) Laser marker device used Manufacturer name: Miyachi Technos Co., Ltd. Model: ML-4141A
(2) Setting conditions Scanning speed: 100 mm / sec. Q switch frequency: 4 kHz
Lamp input current: 12A
Laser incident angle with respect to inner or outer peripheral surface of coil (vertical incidence is 0 degree): around 45 degrees (3) Coil for which insulation coating is to be removed Flat rectangular insulated wire material: Flat insulated enamel wire Wire dimensions : Width 5 mm, thickness 20 μm, insulation coating thickness 3 μm
(4) Results When the method of the present invention was applied to the above coil to remove the insulation coating from the coil end, sufficiently satisfactory conductivity was obtained for both the winding start end and the winding end end. It was. The processing time per coil was about 2 seconds, and considering that the processing time in the case of manual operation using a conventional file was about 20 seconds, an efficiency increase of about 10 times was confirmed. In addition, no interlayer dielectric breakdown has been confirmed, and in this respect as well, a significant improvement in accuracy can be achieved as compared with the conventional method using a corrosive chemical.
[0021]
【The invention's effect】
As is clear from the above description, according to the present invention, since the laser beam is used for the removal of the insulation coating material, the removal of the insulation coating on the coil terminal can be accurately and accurately performed even if the irradiation region of the laser beam is appropriately managed. can be performed rapidly, also as in the case of using corrosive chemicals, possibility of inter-layer short circuit due to penetration of chemicals even rather than, also as is the case by hand using a rasp, it requires skilled personnel I don't have to. In addition, after appropriately setting various parameters of the laser marker device, the relative positional relationship between the laser marker device and the coil can be easily set to the specified relationship simply by setting the target coil on the support base. In addition, the laser irradiation can be performed on the inner and outer peripheral surfaces of the coil under substantially the same conditions.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a basic structure of a laser marker device used for carrying out a method of the present invention.
FIG. 2 is a schematic explanatory view showing a state in which the insulation coating is removed from the winding end of the coil using the method of the present invention.
FIG. 3 is a schematic explanatory view showing a state in which the insulation coating is removed from the winding start end of the coil using the method of the present invention.
FIG. 4 is a diagram showing an example of a coil layout in the case of producing a flat motor field using a coil using a flat insulated wire.
FIG. 5 is an enlarged perspective view of a coil using a flat insulated wire to which the present invention is applied.
FIG. 6 is an enlarged view near the winding start end of the coil.
FIG. 7 is an enlarged view of the vicinity of the winding end of the coil.
[Explanation of symbols]
1, 1a to 1f Coil 2 Winding end 3 Winding end 4 Laser marker device 5 Laser beam 6 X-axis rotating mirror 7 Y-axis rotating mirror 8 Condensing lens 9 Sample stage 10 X-axis galvanometer scanner 11 Y-axis galvanometer scanner 12 , 13 Electric wire 14 Support base 15 Blindfold plate

Claims (3)

The rectangular insulated wire to the surface of the winding end terminal is located in the winding start end and the outer circumferential surface located on the inner peripheral surface of the coil formed by laminating wound spirally, their winding start end and the winding end coil body A method for removing the insulating coating material in the irradiated region by sublimation with the energy of the laser beam by locally irradiating the laser beam while being in close contact with the laser beam ,
For the irradiation of the laser beam, a support base for supporting the coil in a fixed inclination posture is provided on the sample stage of the laser marker apparatus, and the relative positional relationship between the laser marker apparatus and the coil is determined. A method of removing an insulation coating from a coil terminal , wherein the laser beam is locally irradiated obliquely onto the inner and outer peripheral surfaces of the coil by moving and changing each of the coils. Coil according to claim 1, characterized in that said from laser marker device is projected by a predetermined amount blind plate from the side in the optical path of the laser beam toward the coil to limit the scanning range of the laser beam by said purpose Hidden plate How to remove insulation coating on terminals. The method of removing insulation coating from a coil end according to claim 1 or 2 , wherein the flat insulated wire is a flat enameled wire.

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