JP2006238585A - Coil structure and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil structure which can suppress the vibration of a core by coupling an insulating member provided in a slot and the core by means of a fixing material, while securing the insulation distance between the winding of a coil and the stator core, and to provide its manufacturing method. <P>SOLUTION: The coil structure is equipped with the stator core 52 where a slit is made, coil winding 51B which is provided in the slot, vanish 203 impregnating the inside of the slot, and an insulating sheet 201 which is provided between the stator core 52 and the coil winding 51B, along the inner surface of the slot. The insulating sheet 201 is composed of a core material 201A which has an opening 204 and unwoven fabrics 201B which are provided on both sides of the core material 201A. The opening 204 and the unwoven fabrics 201B constitute a pit which allows the vanish 203 to permeate through on one hand and restrains the unwoven fabrics 51B, while restraining the fabrics from entering. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coil structure and a manufacturing method thereof, and more particularly to a coil structure provided in a slot of a stator core and a manufacturing method thereof.

  Conventionally, a coil structure provided in a slot formed in a core is known.

  For example, in Japanese Patent Application Laid-Open No. 2000-14067, an insulating sheet having a plurality of openings penetrating the sheet surface is provided along the inner surface of the slot, and the gap between the coil wound around the slot and the inner surface of the slot is provided. A coil structure impregnated with a fixing material is disclosed.

  Japanese Patent Application Laid-Open No. 2003-333785 discloses a technique for ensuring the mechanical strength of a coil end by providing a hole in an insulating sheet provided at the coil end to infiltrate the varnish.

  Japanese Patent Application Laid-Open No. 10-23698 discloses an insulator made of two or more insulating films and having a plurality of holes in at least one of the insulating films.

  Japanese Patent Application Laid-Open No. 7-274453 discloses that small holes having a predetermined diameter and surface density are provided in an insulating film used for insulating a coil winding.

  Japanese Patent Application Laid-Open No. 9-23601 discloses that an insulating sheet obtained by bonding a resin film and an aromatic polyamide nonwoven fabric is used for insulating a winding portion.

Furthermore, Japanese Patent Application Laid-Open No. 2003-189523 discloses that varnish is dropped on coil end portions formed at both ends of a stator core and varnish is dropped directly on insulating paper.
JP 2000-14067 A JP 2003-333785 A Japanese Patent Laid-Open No. 10-23698 JP-A-7-274453 Japanese Patent Laid-Open No. 9-23601 JP 2003-189523 A

  However, in one aspect, when an opening is provided in an insulating sheet provided along the inner surface of the slot as described in JP 2000-14067 A, the winding of the coil winding is caused by the presence of the opening. As a result, it may be difficult to maintain the insulation distance between the coil winding and the core.

  Further, in Japanese Patent Application Laid-Open Nos. 2003-333785, 10-23698, 7-274453, and 9-23601, the insulation member and the inner surface of the slot are restrained while suppressing the bending of the winding. The idea of impregnating the fixing material between them is not disclosed.

  Further, in another aspect, when varnish is directly dropped onto insulating paper as described in JP-A-2003-189523, the varnish (fixing material) adheres to the outer surface of the stator core, and as a result, for example, the stator core When the clearance between the inner peripheral surface of the rotor and the rotor is filled with the varnish, problems such as difficulty in inserting the rotor may occur.

  The present invention has been made in view of the above problems. An object of the present invention is to provide a coil structure capable of suppressing the vibration of the core by bonding the insulating member provided in the slot and the core with a fixing material while securing the insulation distance between the coil winding and the core. It is in providing the manufacturing method.

  The coil structure according to the present invention includes a core formed with a slot, a coil provided in the slot, a fixing material impregnated in the slot, and the core and the coil winding along the inner surface of the slot. And an insulating member having a hole that transmits the fixing material and suppresses bending of the coil.

  According to the above configuration, the fixing material can be impregnated between the insulating member and the inner surface of the slot while suppressing the bending of the coil winding. As a result, the coil and the core provided in the slot can be coupled with the fixing material, and the vibration of the core can be suppressed.

  In the coil structure, the insulating member preferably includes a resin member having an opening and a non-woven fabric provided on at least the coil side of the resin member.

  According to the above configuration, in the insulating member that transmits the fixing material while suppressing the bending of the winding of the coil, the strength and the fixing material of the insulating member by the nonwoven fabric while ensuring the thickness and hardness of the insulating member by the resin member Can be improved. Therefore, the fixing material can be more effectively impregnated between the insulating member and the inner surface of the slot.

  The method for manufacturing a coil structure according to the present invention includes a step of coating a resin on a main surface of an insulating member, and an insulating member in which a resin is coated in a slot formed in the core so that the resin is positioned on the core side. The step of providing, the step of winding the coil around the core so as to interpose the insulating member, the step of impregnating the fixing material around the winding of the coil in the slot, and raising the temperature to cure the fixing material And a step of dissolving the resin coated on the insulating member to bond the coil and the core.

  Accordingly, the fixing material can be impregnated between the insulating member and the inner surface of the slot while suppressing the fixing material from adhering to the outer surface of the core. As a result, the coil and the core provided in the slot can be coupled with the fixing material, and the vibration of the core can be suppressed.

  According to the present invention, in one aspect, the fixing material can be impregnated between the insulating member and the inner surface of the slot while ensuring an insulating distance between the winding of the coil and the core. In another aspect, the fixing material can be impregnated between the insulating member and the inner surface of the slot while preventing the fixing material from adhering to the outer surface of the core. In any aspect, the coil provided in the slot and the core can be coupled by the fixing material, and the vibration of the core can be suppressed.

  Embodiments of a coil structure and a manufacturing method thereof according to the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

(Embodiment 1)
1 is a cross-sectional view showing an example of a rotating electrical machine having a coil structure according to Embodiment 1. FIG. Referring to FIG. 1, rotating electrical machine 100 includes a control device 10, a three-phase cable 20, a shaft 30, a rotor 40, and a stator 50.

  The rotor 40 includes a rotor core 41 and a permanent magnet 42. Stator 50 includes a stator coil 51 and a stator core 52.

  The control device 10 receives a torque command value TR to be output by the rotating electrical machine 100 from an ECU (Electrical Control Unit) provided outside the rotating electrical machine 100, and outputs the torque specified by the received torque command value TR. Motor control current MCTLI is generated, and the generated motor control current MCTLI is supplied to the stator coil 51 of the stator 50 via the three-phase cable 20.

  The three-phase cable 20 connects the control device 10 and the stator coil 51. The three-phase cable 20 includes a U-phase cable 21, a V-phase cable 22, and a W-phase cable 23. The shaft 30 is inserted into the rotor core 41 of the rotor 40 from the rotation axis direction DR <b> 1 and is connected to the rotor core 41. The rotor core 41 has a structure in which a plurality of electromagnetic steel plates are laminated in the rotation axis direction DR1. The magnet 42 is inserted into the rotor core 41 from the rotation axis direction DR1.

  The stator core 52 of the stator 50 has a structure in which a plurality of electromagnetic steel plates are laminated in the rotation axis direction DR1. The stator coil 51 is wound around the stator core 52. Stator coil 51 includes a U-phase coil, a V-phase coil, and a W-phase coil, and the terminals of these three coils are connected to three-phase cable 20.

  FIG. 2 is a plan view of the stator 50 as viewed from the direction A shown in FIG. Referring to FIG. 2, stator core 52 has a hollow cylindrical shape and has 48 teeth 1 arranged in the circumferential direction on the inner peripheral surface. Coils 510 to 517 constitute a U-phase coil, coils 520 to 527 constitute a V-phase coil, and coils 530 to 537 constitute a W-phase coil. Each of coils 510-517, 520-527, 530-537 has a substantially arc shape. Coils 510 to 517 are arranged on the outermost periphery. The coils 520 to 527 are arranged inside the coils 510 to 517 at positions shifted by a certain distance in the circumferential direction with respect to the coils 510 to 517, respectively. The coils 530 to 537 are arranged inside the coils 520 to 527 at positions shifted from the coils 520 to 527 by a certain distance in the circumferential direction.

  Each of coils 510-517, 520-527, 530-537 is wound in series around each of a plurality of corresponding teeth. For example, coil 510 corresponds to teeth 1-5. The coil 510 is formed by winding a predetermined number of times around the teeth 1 to 5 from the outer periphery.

  The coils 511 to 517, 520 to 527, and 530 to 537 are also wound around the corresponding teeth and formed in the same manner as the coil 510.

  Coils 510 to 513 are connected in series, and one end is terminal U1 and the other end is neutral point UN1. Coils 514 to 517 are connected in series, and one end is terminal U2 and the other end is neutral point UN2.

  Coils 520 to 523 are connected in series, and one end is terminal V1 and the other end is neutral point VN1. Coils 524 to 527 are connected in series, and one end is terminal V2 and the other end is neutral point VN2.

  Coils 530 to 533 are connected in series, and one end is terminal W1 and the other end is neutral point WN1. Coils 534 to 537 are connected in series, and one end is terminal W2 and the other end is neutral point WN2.

  Neutral points UN1, UN2, VN1, VN2, WN1, WN2 are commonly connected to one point, terminals U1, U2 are connected to U-phase cable 21 of three-phase cable 20, and terminals V1, V2 are connected to V-phase. Connected to the cable 22, the terminals W 1 and W 2 are connected to the W-phase cable 23.

  FIG. 3 is a plan view of the rotor 40 and the stator 50 viewed from the direction A shown in FIG. Referring to FIG. 3, rotor 40 is arranged on the inner peripheral side of stator 50. Eight permanent magnets 42 are arranged along the circumferential direction DR2. The permanent magnets 42A, 42C, 42E, and 42G are arranged so that the outer peripheral side of the rotor core 41 is an N pole, and the permanent magnets 42B, 42D, 42F, and 42H are arranged so that the outer peripheral side of the rotor core 41 is an S pole. . Thus, the eight permanent magnets 42 are magnetized in the radial direction DR3 of the rotor 40, and are arranged in the circumferential direction DR2 so that the polarity of the magnet is reversed between adjacent magnets. And the coils 510-517,520-527,531-537 shown in FIG. 2 are arrange | positioned facing the eight permanent magnets 42 (42A-42H).

  The stator core 52 includes 48 teeth, which are determined to be 6 times (integer multiple) the number of permanent magnets 42 (42A to 42H) included in the rotor 40.

  4 is a perspective view of the rotor 40 shown in FIG. Referring to FIG. 4, the rotor core 41 of the rotor 40 has a substantially cylindrical shape and has a cylindrical surface 41A. The permanent magnet 42 is embedded in the rotor core 41 from the rotation axis direction DR1. Accordingly, the rotor 40 is made of IPM (Interior Permanent Magnet).

  FIG. 5 is a view showing the periphery of the stator core slot in the rotating electrical machine 100. 6 is a cross-sectional view taken along the line VI-VI in FIG. Referring to FIG. 5, coil ends 51 </ b> A are formed at both ends of stator core 52, and slots 200 are formed between a plurality of teeth. Referring to FIG. 6, an insulating sheet 201 as an insulating member is provided in the slot 200 along the inner surface of the slot 200. The coil winding 51 </ b> B is wound around the stator core 52 via the insulating sheet 201. A varnish 203 as a fixing material is impregnated around the coil winding 51 </ b> B and a gap 202 between the insulating sheet 201 and the inner peripheral surface of the slot 200.

  FIG. 7 is a perspective view showing a core material 201 </ b> A included in the insulating sheet 201. FIG. 8 is a cross-sectional view of the insulating sheet 201. Referring to FIG. 7, opening 204 is provided in core material 201A. Referring to FIG. 8, insulating sheet 201 has a three-layer structure in which nonwoven fabric 201B is attached to both sides of core material 201A. Here, the nonwoven fabric 201 </ b> B has minute gaps between the fibers and can transmit the varnish 203. Therefore, the varnish 203 impregnated on the inner peripheral side (coil side) of the insulating sheet 201 reaches the gap 202 via the opening 204 and the nonwoven fabric 201B attached to both sides of the core material 201A. That is, the gap between the fibers in the opening 204 of the core material 201A and the nonwoven fabric 201B forms a hole through which the varnish 203 is transmitted.

  As described above, the coil winding 51 </ b> B and the stator core 52 are coupled via the varnish 203 by impregnating the gap 202 with the varnish 203. Thereby, the vibration mechanism of coil winding 51B and stator core 52 changes.

  FIG. 9 is a diagram showing a vibration mechanism of the coil winding and the stator core. 9A shows a vibration mechanism in the rotating electrical machine according to the reference example, and FIG. 9B shows a vibration mechanism in the rotating electrical machine 100 according to the present embodiment.

  9 (a) and 9 (b), in the rotating electrical machine according to the reference example, the stator core vibrates alone, but in rotating electrical machine 100 according to the present embodiment, the coil winding and the stator core are integrated. It is vibrating.

In general, the excitation force F, mass m and vibration level α are:
F = mα (1)
And α / F = 1 / m from equation (1)
Is guided. Here, α / F is an index representing the ease of vibration. That is, as the mass m of the vibrating body is larger, the vibrating body is less likely to vibrate.

  As described above, in the rotating electrical machine according to the present embodiment, the gap between the insulating sheet and the stator core is impregnated with varnish, whereby the coil winding and the stator core are coupled, and the mass m of the vibrating body is relatively large. Become. Thereby, the vibration of the stator core is suppressed. Moreover, the vibration suppression effect by the coil couple | bonded with the stator core functioning as a damper can also be expected. As a result, noise during driving of the rotating electrical machine is suppressed.

  FIG. 10 is a diagram illustrating the vibration level of the stator core when the rotating electrical machine is driven. In FIG. 10, “a” indicates a vibration level in the rotating electrical machine according to the reference example, and “b” indicates a vibration level in the rotating electrical machine 100 according to the present embodiment. As shown in FIG. 10, in the rotating electrical machine 100 according to the present embodiment, the vibration level of the stator core is reduced compared to the reference example.

  Next, the significance of providing a nonwoven fabric on the opening of the core material will be described.

  FIG. 11 is a diagram schematically showing an intermediate step of winding a coil around the stator core 52. Referring to FIG. 11, coil ends 51 </ b> A formed at axial end portions on both sides of stator core 52 are pressed toward stator core 52.

  FIG. 12 is a diagram for explaining the bending of the coil winding in the process shown in FIG. Referring to FIG. 12, when coil end 51A is pressed in the axial direction of stator core 52, bending occurs in coil winding 51B. As shown in FIG. 12, when the coil winding is deformed, the insulating sheet 201 is pressed against the stator core 52 and the width of the gap 202 is narrowed. Therefore, the coil and the stator core are coupled by the varnish that flows into the gap 202. It becomes easy. On the other hand, since the coil winding is deformed in this way, the distance between the coil winding and the stator core that needs to maintain an insulation distance is reduced. Therefore, it is important to suppress excessive deformation of the coil winding.

  On the other hand, in this Embodiment, since the nonwoven fabric 201B is provided on the opening part 204 of the core material 201A, the coil winding 51B is suppressed from entering the opening part 204. In other words, the nonwoven fabric 201B provided on the coil winding 51B side with respect to the core material 201A functions to suppress the bending of the coil winding 51B. Thereby, the space | interval of the coil winding 51B and the stator core 52 can be maintained more than the fixed distance (here about thickness of the core material 201A) which can ensure insulation.

  On the other hand, by providing the nonwoven fabric 201B on the stator core 52 side of the core material 201A, the varnish that has passed through the opening 204 penetrates the nonwoven fabric 201B and easily spreads over the entire gap 202. Here, the varnish spreads not only below the opening 204 but also above the opening 204 by capillary action. As a result, the degree of coupling between the coil and the stator core is increased, and the above-described effect of reducing the vibration level is enhanced. That is, the nonwoven fabric 201B provided on the stator core 52 side with respect to the core material 201A functions to spread the varnish that has passed through the opening 204 over a wider range of the gap 202. It is considered that the same effect can be obtained by using a porous material such as sponge instead of the nonwoven fabric 201B on the stator core 52 side.

  FIG. 13 is a view showing an insulating sheet 201 attached to the slot 200 of the stator core 52 in a modification of the coil structure according to the present embodiment. FIG. 13A is a longitudinal sectional view of the sheet, and FIG. 13B is an XIIIB-XIIIB sectional view in FIG. Referring to FIG. 13, in the present modification, a nonwoven fabric is not provided on the stator core side with respect to core material 201 </ b> A, and a groove 205 is formed on the side surface of core material 201 </ b> A on the stator core 52 side. As a result, the varnish that has passed through the opening 204 reaches the wide range of the gap 202 through the groove 205.

  By the way, said core material 201A is comprised including polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc., for example. As a result, a certain thickness can be secured at a relatively low cost, and an insulation distance between the coil winding 51B and the stator core 52 can be secured. On the other hand, since these materials may have relatively fragile properties, the strength of the insulating sheet 201 can be improved by providing, for example, a polyamide-based nonwoven fabric 201B on one side or both sides of the core material 201A.

  In place of the non-woven fabric 201B, for example, by providing a resin film having fine holes on the opening 204, the gap between the insulating sheet and the stator core is maintained while maintaining the insulation distance between the coil winding and the stator core. It is considered that the vibration of the stator core can be suppressed by impregnating the fixing material.

  The above contents are summarized as follows. That is, the coil structure according to the present embodiment includes a stator core 52 in which the slot 200 is formed, a coil winding 51B provided in the slot 200, a varnish 203 impregnated in the slot 200, and an inner surface of the slot 200. And an insulating sheet 201 provided between the stator core 52 and the coil winding 51B. Here, the insulating sheet 201 includes a core material 201A as a resin member having an opening 204 and a nonwoven fabric 201B provided on at least the coil winding 51B side of the core material 201A. The opening 204 and the nonwoven fabric 201B constitute a hole that transmits the varnish 203 and suppresses the bending of the coil winding 51B. The coil winding 51B is prevented from entering the “hole”.

(Embodiment 2)
FIG. 14 is a diagram illustrating an intermediate step in the method for manufacturing a coil structure according to the second embodiment. In the present embodiment, as shown in FIG. 14, the insulating sheet 201 coated with the resin 206 is attached to the slot 200 of the stator core 52.

  After the process shown in FIG. 14, the coil is wound so as to interpose the insulating sheet 201, and the varnish is impregnated around the coil winding. And the temperature rising process for hardening a varnish is given.

  The resin 206 coated on the insulating sheet 201 is dissolved by the high temperature (for example, about 160 ° C.) during the temperature raising step. As a result, the resin 206 is filled in the gap between the insulating sheet 201 and the inner peripheral surface of the stator core, and the coil and the stator core are coupled by curing the resin 206. The resin 206 does not need to be completely filled in the gap, and may be filled to such an extent that the coil and the stator core vibrate together.

  Also in the present embodiment, since the coil and the stator core are integrated and the mass of the vibrating body is increased, it is possible to suppress the vibration of the stator core when the rotating electrical machine is driven.

  FIG. 15 is a longitudinal sectional view showing a rotor core and a stator core in a rotating electrical machine according to a reference example. Referring to FIG. 15, in this reference example, the varnish is filled in the gap between the insulating sheet and the stator core by dropping the varnish not only on the inside of the insulating sheet but also on the insulating paper itself as the insulating sheet. Has been tried. However, according to this reference example, as shown in FIG. 15, the varnish 203 may adhere to the outer surface (upper surface, lower surface, inner peripheral surface, etc.) of the stator core. As a result, there arises a problem that it becomes difficult to insert the rotor core 41 into the stator core 52 and to fasten the stator core 52 with the bolts 53. In addition, it is necessary to prevent the adhered varnish from peeling off during operation of the rotating electrical machine.

  On the other hand, according to the coil structure according to the present embodiment, the varnish can be impregnated between the insulating sheet 201 and the inner peripheral surface of the slot 200 while suppressing the varnish from adhering to the outer surface of the stator core 52. it can. As a result, the insulating sheet 201 provided in the slot 200 and the stator core 52 are coupled by varnish, and the vibration of the stator core 52 when the rotating electrical machine is driven can be suppressed as in the first embodiment.

  The above contents are summarized as follows. That is, in the coil structure manufacturing method according to the present embodiment, the resin 206 is coated on the slot 200 formed on the stator core 52 and the step of coating the resin 206 on the main surface of the insulating sheet 201 as an insulating member. The step of providing the insulating sheet 201 so that the resin 206 is located on the stator core 52 side, the step of winding a coil around the stator core 52 so as to interpose the insulating sheet 201, and the periphery of the coil winding in the slot 200 A step of impregnating the varnish as a material, and a step of bonding the insulating sheet 201 and the stator core 52 by increasing the temperature to cure the varnish and dissolving the resin 206 coated on the insulating sheet 201.

(Embodiment 3)
FIG. 16 is a view showing the periphery of the slot 200 of the stator core 52 having the coil structure according to the third embodiment. Referring to FIG. 16, in the present embodiment, cutout portion 207 is provided in insulating sheet 201.

  By providing the notch 207, the varnish dripped onto the surface of the tooth 1 flows into the gap between the inner peripheral surface of the slot 200 and the insulating sheet 201. And the varnish is filled in the clearance gap between the inner peripheral surface of the slot 200 and the insulating sheet 201, and a coil and a stator core are couple | bonded. As a result, the mass of the vibrating body is increased, and the vibration of the stator core 52 when the rotating electrical machine is driven can be suppressed as in the first and second embodiments.

  Although the embodiments of the present invention have been described above, it is planned from the beginning to appropriately combine the characteristic portions of the respective embodiments described above. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing which showed an example of the rotary electric machine which has the coil structure which concerns on Embodiment 1 of this invention. It is a top view of the stator seen from the A direction shown in FIG. It is a top view of the rotor and stator seen from the A direction shown in FIG. It is a perspective view of the rotor shown in FIG. It is the figure which showed the slot periphery of the stator core in the rotary electric machine shown in FIG. It is VI-VI sectional drawing in FIG. It is the perspective view which showed the core material contained in the insulating member shown by FIG. It is sectional drawing which showed the insulating member shown by FIG. It is the figure which showed the vibration mechanism of a stator core and a coil winding, (a) shows the vibration mechanism in the rotary electric machine which concerns on a reference example, (b) shows the vibration mechanism in the rotary electric machine which concerns on Embodiment 1 of this invention. Show. It is a figure which shows the vibration level of the stator core at the time of the drive of a rotary electric machine. It is the figure which showed typically the process of pressing a coil end to the axial direction of a stator core. It is a figure explaining the bending of the coil winding by the process shown by FIG. It is the figure which showed the insulating member attached to the slot of the stator core in the modification of the coil structure which concerns on Embodiment 1 of this invention, (a) is a longitudinal cross-sectional view, (b) is XIIIB- in (a). It is XIIIB sectional drawing. It is the figure which showed the process of attaching an insulating member to the slot of a stator core in the manufacturing method of the coil structure which concerns on Embodiment 2 of this invention. It is the longitudinal cross-sectional view which showed the rotor core and stator core in the rotary electric machine which concerns on a reference example. It is the figure which showed the slot periphery of the stator core which has the coil structure which concerns on Embodiment 3 of this invention.

Explanation of symbols

  1 to 5 teeth, 10 control device, 20 three-phase cable, 21 U-phase cable, 22 V-phase cable, 23 W-phase cable, 30 shaft, 40 rotor, 41 rotor core, 41A cylindrical surface, 42, 42A to 42H permanent magnet, 50 Stator, 51 Stator Coil, 51A Coil End, 51B Coil Winding, 52 Stator Core, 100 Rotating Electric Machine, 200 Slot, 201 Insulating Sheet, 201A Core Material, 201B Nonwoven Fabric, 202 Gap, 203 Varnish, 204 Opening, 205 Groove, 206 Resin, 207 Notch, 510-517, 520-527, 530-537 Coil, U1, U2, V1, V2, W1, W2 terminals, UN1, UN2, VN1, VN2, WN1, WN2 Neutral point.

Claims (3)

A core formed with a slot;
A coil provided in the slot;
A fixing material impregnated in the slot;
A coil structure including an insulating member provided between the core and the winding of the coil along the inner surface of the slot, and having a hole that transmits the fixing material and suppresses the bending of the coil. .   The coil structure according to claim 1, wherein the insulating member includes a resin member having an opening and a non-woven fabric provided on at least the coil side of the resin member. Coating the resin on the main surface of the insulating member;
Providing an insulating member coated with the resin in a slot formed in the core so that the resin is located on the core side;
Winding a coil around the core so as to interpose the insulating member;
Impregnating a fixing material around the winding of the coil in the slot;
A method for manufacturing a coil structure, comprising: raising the temperature to cure the fixing material, and dissolving the resin coated on the insulating member to bond the coil and the core.

Images