JP2007166791A - Vanish processing method and stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a varnish processing method and a stator for preventing a varnish from being exuded from a coil to an end face of a stator core and also preventing the varnish from being attached to a region disallowed to attach the varnish without impairing the quality and productivity of the stator. <P>SOLUTION: In the varnish processing method implemented by a varnish processing apparatus 1 and processing the varnish on the coil 2 in the stator 3, the varnish is processed to the stator 3 having a ring member 50 provided with a liquid absorbing property and an elasticity on the end face of the stator core 40 and an outer circumference of the coil 2. The varnish exuded from the coil 2 to the end face of the stator core 40 is pooled and absorbed by the ring member 50. Since the varnish is prevented from being exuded from the coil 2 to the end face of the stator core 40, the varnish is prevented from being attached to the region 41 of the stator core 40 disallowed to attach the varnish. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a varnish treatment method for performing varnish treatment on a coil of a stator, and a stator for performing the varnish treatment. More specifically, the present invention relates to a varnish treatment method and a stator that can prevent varnish from seeping out from a coil to an end face of a stator core.

  Conventionally, in a stator of a motor, a varnish impregnation treatment is performed on a coil mounted on a stator core for the purpose of improving the insulation, heat resistance, and strength of the stator. Here, the motor case is attached to the stator. However, if the varnish adheres to the outer peripheral portion of the end surface of the stator core, the motor case cannot be attached accurately. Thus, there is a portion where the varnish should not adhere to the end face of the stator core.

  For this reason, a varnish treatment technique for preventing varnish adhesion to a varnish adhesion-impossible portion of the stator core has been proposed. One of them is disclosed in, for example, Japanese Patent Laid-Open No. 6-327200. In the varnish processing technique disclosed here, a fine protrusion is provided on the inner peripheral surface of the slot of the iron core (stator core) to form a continuous gap generated between the slot insulator (slot insulating paper) and finely divided. It is designed to be filled with varnish. Then, as a method of subdividing the gap between the slot inner peripheral surface and the slot insulator, providing fine projections on the slot inner peripheral surface, providing fine projections on the slot insulator outer peripheral surface, and slot inner periphery It is exemplified that a string-like divided body is inserted into the gap between the surface and the slot insulator.

  In this varnish processing technology, the gap between the slot inner peripheral surface and the slot insulator is subdivided, thereby making it possible to extremely delay the speed at which the varnish flows out of the gap due to the viscous resistance of the varnish itself. The varnish can be held in the coil until the varnish is cured by heat drying. As a result, it is possible to prevent the varnish from seeping out from the coil and to prevent the varnish from adhering to the varnish non-applicable part of the stator core.

  In addition to the above-described technique, a technique for performing a varnish impregnation process by masking a non-varnishable portion with a tape or a jig is known.

JP-A-6-327200

  However, the above varnish processing technique has the following problems. That is, when a fine protrusion is provided on the inner circumferential surface of the slot, the space factor is deteriorated, so that the performance is deteriorated. Further, since the frictional resistance of the slot inner peripheral surface is increased, the insertability of the slot insulator is deteriorated, and the productivity of the stator is deteriorated. Furthermore, since the press mold of the stator core becomes complicated, the service life is shortened, resulting in an increase in the cost of the stator.

  In the case where fine protrusions are provided on the outer peripheral surface of the slot insulator, the occupation ratio of the slot insulator in the slot increases, so that the space factor deteriorates and the performance deteriorates. Further, since the surface frictional resistance of the slot insulator is increased, the insertability into the slot is deteriorated, and the productivity of the stator is deteriorated. Further, since the slot insulator has a complicated shape, the productivity of the slot insulator is deteriorated.

When a string-like divided body is inserted into the gap between the slot inner peripheral surface and the slot insulator, the space factor deteriorates and performance deteriorates because the string-shaped divided body is newly inserted into the slot. Resulting in. Further, since the work for inserting the string-like divided body into the slot occurs, the productivity of the stator deteriorates.
Thus, the varnish treatment technique described above can prevent the varnish from seeping out from the coil, but has a problem that the quality and productivity of the stator deteriorate.

On the other hand, the quality of the stator will not be deteriorated if it is a technique for masking the varnish non-adhesive site with a tape or a jig. However, with this technique, it is necessary to remove the tape and jig after the varnish impregnation treatment, and the work for that purpose increases, so the productivity of the stator decreases. Moreover, when using a tape, it is difficult to affix on a varnish adhesion impossible site | part without a gap, and a varnish will enter into the place where the gap was made. On the other hand, even when a jig is used, the jig thermally expands during the varnish treatment, a gap is generated between the jig and the end face of the stator core, and the varnish adheres to a portion where the varnish cannot be adhered.
As described above, the technique of masking with a tape, a jig, or the like has a problem that it is impossible to prevent varnish adhesion to a portion where varnish adhesion is impossible.

  Accordingly, the present invention has been made to solve the above-described problems, and prevents the varnish from exuding from the coil to the end face of the stator core without impairing the quality and productivity of the stator. It is an object to provide a varnish treatment method and a stator that can prevent varnish from adhering to the surface.

  The varnish treatment method according to the present invention made to solve the above-mentioned problems is a varnish treatment method in which a varnish is dropped and impregnated into the coil while rotating the stator core on which the coil is mounted. The varnish is dropped onto the coil in a state where a ring-shaped member is disposed on the outer periphery of the coil.

  In this varnish treatment method, in a state where a ring-shaped member is disposed on the end face of the stator core and on the outer periphery of the coil, the varnish is dropped onto the coil while rotating the stator core, and the varnish is impregnated in the coil. Here, the varnish that oozes out from the coil to the end surface of the stator core flows to the outer peripheral end of the stator core (the motor case mounting portion and the varnish non-attachable portion) due to the centrifugal force accompanying the rotation of the stator core. However, in the present invention, since the ring-shaped member is disposed on the end surface of the stator core and on the outer peripheral portion of the coil, the varnish that tries to ooze out from the coil to the stator end surface is blocked by the ring-shaped member. And since the ring-shaped member is arrange | positioned in the outer peripheral part of a coil, before a varnish oozes out to a stator core end surface from a coil, it is dammed up. Accordingly, it is possible to prevent the varnish from seeping out from the coil to the end face of the stator core. Thereby, varnish adhesion to the varnish adhesion impossible site | part of a stator core end surface can be prevented.

  Even if the ring-shaped member is left as it is, it does not adversely affect the quality of the stator. For this reason, it is not necessary to remove the ring-shaped member. Further, since the ring-shaped member is disposed on the outer periphery of the coil, the space factor does not deteriorate. Therefore, according to the varnish treatment method of the present invention, it is possible to prevent the varnish from adhering to the portion where the varnish cannot be adhered by preventing the varnish from exuding from the coil to the end surface of the stator core without impairing the quality and productivity of the stator. can do.

In the varnish treatment method according to the present invention, it is desirable that the ring-shaped member is formed of a material having liquid absorbency.
In addition, the material which has a liquid absorptivity means the material which can absorb liquids, such as varnish (it is easy to absorb).

Thus, by forming a ring-shaped member with a liquid-absorbing material, varnish can be efficiently absorbed and hardening of the varnish can be promoted. Therefore, the varnish blocking effect by the ring-shaped member can be further enhanced.
Further, since the ring-shaped member has liquid absorbency, the varnish that is likely to leak from the coil to the stator core end surface can be reliably absorbed even if the stator core end surface and the ring-shaped member are not in close contact with each other.

  Moreover, in the varnish processing method which concerns on this invention, it is desirable for the said ring-shaped member to be shorter than the circumference of the said coil, and to have a stretching property.

  If it is such a ring-shaped member, it is stretched and widened with a jig or the like (peripheral length is increased), moved from the end of the coil to the stator core side, and then removed from the ring-shaped member. Thus, the ring-shaped member can be easily attached to the end face of the stator core and the outer peripheral portion of the coil. That is, workability is very good. For this reason, the productivity of the stator does not deteriorate due to the mounting of the ring-shaped member.

  In the varnish treatment method according to the present invention, the ring-shaped member may be a string.

  If the ring-shaped part is a string, the ring-shaped member can be easily mounted on the end face of the stator core and the outer peripheral part of the coil by winding the coil around the coil outer peripheral part. That is, workability is very good. For this reason, the productivity of the stator is not deteriorated by the mounting of the ring-shaped member. In addition, when using a string as a ring-shaped member, it is preferable to wind a string double or triple around the coil outer peripheral part. This is because the varnish damming effect can be enhanced.

  A stator according to the present invention, which has been made to solve the above-mentioned problems, is characterized in that a ring-shaped member is disposed on an end surface of the stator core and on the outer periphery of the coil in a stator in which a coil is mounted on the stator core. To do.

  In this stator, a ring-shaped member is disposed on the end surface of the stator core and on the outer peripheral portion of the coil. Therefore, when the varnish is impregnated into the coil, the varnish that oozes from the coil to the stator core end surface is blocked by the ring-shaped member. Can do. For this reason, it is possible to prevent the varnish from seeping out from the coil to the end face of the stator core. Thereby, varnish adhesion to the varnish adhesion impossible site | part of a stator core end surface can be prevented.

  In the stator according to the present invention, it is preferable that the ring-shaped member is formed of a material having a liquid absorbing property.

By forming the ring-shaped member from a material having liquid absorbency, it is possible to efficiently absorb the varnish that is about to ooze out of the coil and to promote the hardening of the varnish. Therefore, the varnish blocking effect by the ring-shaped member can be further enhanced.
Further, since the ring-shaped member has liquid absorbency, it is possible to reliably absorb the varnish that is about to ooze out from the coil even if the end surface of the stator core and the ring-shaped member are not in close contact with each other.

  In the stator according to the present invention, it is desirable that the ring-shaped member is shorter than the circumferential length of the coil and has elasticity.

  If it is such a ring-shaped member, it is stretched and widened with a jig or the like (the circumference is lengthened), moved from the end of the coil outer periphery to the stator core side, and then moved from the ring-shaped member to the jig or the like. The ring-shaped member can be easily attached to the end face of the stator core and the outer peripheral portion of the coil. That is, workability is very good. For this reason, the productivity of the stator does not deteriorate due to the mounting of the ring-shaped member.

In the stator according to the present invention, the ring-shaped member may be a string.
If the ring-shaped part is a string, the ring-shaped member can be easily mounted on the end face of the stator core and the outer peripheral part of the coil by winding the coil around the coil outer peripheral part. That is, workability is very good. For this reason, the productivity of the stator is not deteriorated by the mounting of the ring-shaped member. In addition, when using a string as a ring-shaped member, it is preferable to wind the string in a double or triple manner around the outer periphery of the coil. This is because the varnish damming effect can be enhanced.

  According to the varnish treatment method and the stator according to the present invention, as described above, the varnish can be prevented from exuding from the coil to the end face of the stator core without impairing the quality and productivity of the stator, and the varnish cannot be adhered to the varnish. Can be prevented from adhering.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a most preferred embodiment in which a varnish treatment method and a stator of the present invention are embodied will be described in detail with reference to the drawings. Therefore, first, a schematic configuration of an apparatus that performs the varnish processing method according to the present embodiment will be described with reference to FIGS. FIG. 1 is a front view showing a schematic configuration of a varnish treatment apparatus according to the present embodiment. FIG. 2 is a side view showing a schematic configuration of the varnish treatment apparatus according to the present embodiment. FIG. 3 is an enlarged view of a main part of the stator holding portion shown in FIG.

  As shown in FIGS. 1 and 3, the varnish processing apparatus 1 includes a stator holding portion 4 that holds and rotates the stator 3 on which the coil 2 is mounted, a varnish supply pump 5 that discharges the varnish, and the varnish supply. Varnish dripping nozzles 7, 8, 9, 10 connected to the pump 5 via a pipe 6 are arranged. The varnish dropping nozzles 7 and 8 drop varnish from the outer peripheral side of the coil 2, and the varnish dropping nozzles 9 and 10 drop varnish to be impregnated from the inner peripheral side of the coil 2.

  Further, as shown in FIG. 2, the back surface of the varnish treatment apparatus 1 has a fan motor 15 that blows outside air and the outside air supplied from the fan motor 15 at a predetermined temperature (in this embodiment, about 60 ° C.). And a heater 16 for heating to 160 ° C. Thereby, hot air is supplied into the apparatus covered with the cover 17 (in the direction of the arrow 18).

  As shown in FIG. 1, an exhaust duct 21 in which a filter 20 is housed is provided on the opposite side of the stator holding portion 4, and hot air in the apparatus is exhausted by a fan motor 22. (Direction of arrow 23). Further, an operation panel 11 for performing an operation and a control device 12 for controlling the stator holding unit 4, the varnish supply pump 5, the heater 16 and the like are provided above the stator holding unit 4. And the varnish processing apparatus 1 is arrange | positioned on the floor etc. via each leg member 24. FIG.

  The stator holding portion 4 is fitted with the inner diameter portion of the stator 3 on one end side and is detachably attached to a work rotating shaft 25, and a pair of bearings 26 that horizontally and rotatably support the rotating shaft 25. A driven pulley 27 fixed to the other end side of the work rotation shaft 25, a motor 28, a drive pulley 29 fixed to the shaft of the motor 28, and between the drive pulley 29 and the driven pulley 27. A belt 30 is provided. The work rotation shaft 25 is provided with a chuck 25a so that the stator 3 can be held by the inner diameter portion.

  As shown in FIG. 3, the varnish dripping nozzles 7 and 8 are arranged at positions corresponding to positions slightly on the front side from the outermost uppermost portion of the coil end portion of the coil 2 protruding at both axial end portions of the stator 3. The varnish is dripped from the outer peripheral side of the stator 3. On the other hand, the varnish dripping nozzles 9 and 10 are disposed at positions corresponding to positions slightly on the innermost side from the innermost lowermost part of the coil end of the coil 2 protruding at both axial ends of the stator 3, respectively. Varnish is dripped from the peripheral side.

  Here, the stator which performs a varnish process with the varnish processing apparatus 1 is demonstrated, referring FIG. 4 and FIG. FIG. 4 is a plan view showing a schematic configuration of the stator according to the present embodiment. FIG. 5 is a diagram showing the arrangement position of the ring-shaped member. As shown in FIGS. 4 and 5, the stator 3 has a coil 2 mounted in a slot formed in an annular stator core 40. A ring-shaped member 50 is attached to the stator 3. The ring-shaped member 50 is attached to the end surface of the stator core 40 and the outer peripheral portion of the coil 2. The ring-shaped member 50 is formed shorter than the circumferential length of the coil 2 by a material having liquid absorbency and stretchability (for example, polyvinyl alcohol (PVA)). For this reason, the ring-shaped member 50 can be mounted elastically like a rubber band stop. Thus, after the ring-shaped member 50 is extended and widened by a jig or the like (peripheral length is increased) and moved from the end of the coil 2 to the stator core 40 side, the jig or the like is removed from the ring-shaped member 50. By removing, the ring-shaped member 50 can be easily attached to the end face of the stator core 40 and the outer peripheral portion of the coil 2. Thus, the attachment property (workability) of the ring-shaped member 50 to the stator 3 is very good.

  When the motor is configured using the stator 3, a motor case is attached to the stator 3. At this time, the outer peripheral end portion of the stator core 40 becomes a mounting surface of the motor case. If the varnish adheres to the motor case mounting surface, the motor case cannot be mounted in a state of being in close contact with the end surface of the stator core 40. For this reason, the outer peripheral end portion (the mounting surface of the motor case) of the stator core 40 is a varnish non-adhesive portion 41.

  Next, a varnish treatment method for the coil 2 of the stator 3 by the varnish treatment apparatus 1 having the above-described configuration will be described. First, the stator 3 to which the ring-shaped member 50 is attached is attached and fixed to the chuck 25a of the workpiece rotating shaft 25. When the cover 17 is closed and the start button on the operation panel 11 is pressed, the motor 28 is driven by the control device 12. Then, the rotation of the motor 28 is transmitted to the work rotation shaft 25 via the drive pulley 29, the belt 30 and the driven pulley 28. Thereby, the workpiece | work rotating shaft 25 rotates in the direction of the arrow 46 (refer FIG. 3), and the stator 3 rotates.

  Also, the fan motor 15 is driven by the control device 12, and hot air of a predetermined temperature (about 160 ° C. in the present embodiment) heated through the heater 16 is blown into the device (in the direction of arrow 18 in FIG. 1). The At the same time, the fan motor 22 is driven, and hot air in the apparatus is exhausted from the exhaust duct 21 to the outside through the filter 20 and the like (in the direction of arrow 23 in FIG. 1). Thereby, the stator 3 is preheated. The reason why the stator 3 is preheated in this way is to make the dropped varnish easily penetrate into the coil 2 (decrease the viscosity of the varnish).

  When the preheating of the stator 3 is completed, the varnish supply pump 5 is operated by the control device 12. Thereby, the varnish discharged from the varnish supply pump 5 is supplied to the varnish dropping nozzles 7, 8, 9, 10 through the pipe 6. Then, as shown in FIG. 6, the varnish is dropped from the varnish dropping nozzles 7 and 8 to the outer peripheral side of the coil 2. Further, varnish is dropped from the varnish dropping nozzles 9 and 10 to the inner peripheral side of the coil 2. Thus, varnish impregnation to the coil 2 is started. FIG. 6 is an explanatory view showing a state in which a varnish treatment is performed on a stator in which a ring-shaped member is disposed on the outer periphery of the coil.

  And the varnish dripped from the varnish dripping nozzles 7, 8 and 9, 10 respectively falls downward due to its own weight, and hits and adheres to the outer circumference and the inner circumference of the coil 2. Thereafter, the varnish adhering to the outer periphery and inner periphery of the coil 2 covers the surface of the coil 2 and is impregnated between the windings by capillary action.

  When the varnish is being dropped from the varnish dropping nozzles 7 to 10, the stator 3 is rotated along with the rotation of the work rotation shaft 25. For this reason, since the part which the varnish dripped from the varnish dripping nozzles 7-10 contacts always changes, the varnish is made to impregnate the coil 2 uniformly.

  Here, since the coil 2 is impregnated with the varnish while rotating the stator 3, a part of the varnish impregnated in the coil 2 oozes out. Then, the varnish that has oozed out from the coil 2 to the end face of the stator core 40 flows to the varnish non-applicable portion 31 that exists at the outer peripheral end of the stator core 40 due to the centrifugal force accompanying the rotation of the stator 3 and The varnish will adhere.

  However, the ring-shaped member 50 is attached to the stator 3 according to the present embodiment. That is, the ring-shaped member 50 is disposed on the end face of the stator core 40 and the outer peripheral portion of the coil 2. Therefore, the varnish that is about to ooze out from the coil 2 to the end face of the stator core 40 is blocked by the ring-shaped member 50. Moreover, since the ring-shaped member 50 has a liquid absorptivity, while being able to absorb the varnish blocked up efficiently, hardening of a varnish can be accelerated | stimulated. Thereby, the varnish blocking effect by the ring-shaped member 50 is further enhanced. Further, since the ring-shaped member 50 has liquid absorbency, even if the end surface of the stator core 40 and the ring-shaped member 50 are not in close contact with each other, it is possible to reliably prevent the varnish from leaking from the coil 2 to the end surface of the stator core 40. Can be absorbed. Therefore, during the varnish treatment, it is possible to reliably prevent the varnish from adhering to the varnish non-adherent portion 41.

  Subsequently, the control device 12 stops the operation of the varnish supply pump 5 after a predetermined time (about 13 minutes in the present embodiment) has elapsed since the start of driving of the varnish supply pump 5. Thereby, dripping of the varnish from each dripping nozzle is stopped, and the impregnation process of the varnish to the coil 2 is complete | finished.

Further, the heating temperature of the heater 16 is raised to a predetermined temperature (about 160 ° C. in the present embodiment) by the control device 12 to heat the stator 3, and the varnish impregnated in the coil 2 is gelled and dried. The Also at this time, since the stator 3 is rotated, the portion heated by the hot air blown at a predetermined temperature always changes, and the varnish impregnated in the coil 2 is uniformly gelled and dried.
Then, when a predetermined time (about 30 minutes in the present embodiment) elapses after the heating temperature of the heater 16 rises to the predetermined temperature and the gelling process of the varnish impregnated in the coil 2 is completed, the control device 12 Thus, the temperature of the heater 16 is lowered to the normal temperature.

  Thereafter, the operation of the motor 28 is stopped by the control device 12, and the rotation of the stator 3 is stopped. The stator 3 whose cover 17 is opened and the varnish impregnation step and the gelation / drying step are completed is removed from the work rotating shaft 25, and the gelation / drying step is completed in a separate drying furnace. A curing and drying process is performed, and the varnish impregnated in the coil 2 is cured.

  Note that the ring-shaped member 50 remains attached to the stator 3 without being removed. This is because the ring-shaped member 50 does not need to be removed because it does not adversely affect the quality of the stator 3. Thus, since the ring-shaped member 50 can be attached very easily and does not need to be removed, the productivity of the stator 3 does not deteriorate. Further, since the ring-shaped member 50 that prevents the varnish from seeping out is disposed on the outer peripheral portion of the coil 2, the space factor does not deteriorate as in the above-described conventional example, and therefore the performance of the stator 3 deteriorates. There is nothing.

  Here, a modified example of the ring-shaped member 50 will be described. In the stator 3 described above, a ring-shaped member 50 is used to prevent the varnish from seeping out from the coil 2 to the end face of the stator core 40. However, instead of using the ring-shaped member 50, a string 51 may be wound around the end surface of the stator core 40 and the outer peripheral portion of the coil 2 as shown in FIG. In FIG. 7, the string 51 is doubled and wound around the outer periphery of the coil 2. FIG. 7 is an explanatory view showing a state in which a varnish treatment is performed on a stator in which a string is wound around the outer periphery of the coil.

  Note that the string 2 may be wound around the coil 2 by a single layer, but it is preferable to perform a double layer or more if possible. This is because the varnish damming (absorption) effect can be enhanced. The string 51 is formed of a material having a liquid absorbing property (for example, polyphenylene sulfide (PPS)). Since polyphenylene sulfide (PPS) is made of the same material as the lacing yarn used in the lacing process for bundling the coil 2, the lacing yarn can also be used.

  When such a string 51 is used, since the string 51 can be attached by a simple operation only by winding the string 51 around the outer peripheral portion of the coil 2, workability is very good. For this reason, even if the string 51 is used, the productivity of the stator 3a does not deteriorate. And the varnish process by the varnish processing apparatus 1 is implemented with respect to the coil 2 of the stator 3a in the state where the string 51 was wound. At this time, the string 51 has the same function and effect as the ring-shaped member 41, and the varnish from the coil 2 to the stator core 40 can be prevented.

  As described above in detail, in the varnish treatment method for the coil 2 of the stator 3 by the varnish treatment apparatus 1 according to the present embodiment, the end face of the stator core 40 and the outer peripheral portion of the coil 2 are provided with liquid absorption and elasticity. Since the varnish treatment is performed on the stator 3 on which the ring-shaped member 50 is disposed, the varnish that tries to ooze from the coil 2 to the end face of the stator 40 is blocked and absorbed by the ring-shaped member 50. For this reason, since the varnish seepage from the coil 2 to the end face of the stator core 40 is prevented, the varnish adhesion to the varnish non-applicable portion 41 of the stator core 40 can be prevented.

And since the attachment of the ring-shaped member 40 to the outer peripheral part of the coil 2 is very simple and the ring-shaped member 40 is left as it is, the quality of the stator 3 is not adversely affected. There is no need to remove the ring-shaped member 40. For this reason, the productivity of the stator 3 does not deteriorate. Further, since the ring-shaped member 40 is disposed on the outer peripheral portion of the coil 2 in order to prevent the varnish from seeping out, the space factor is not deteriorated.
Therefore, the varnish can be prevented from exuding from the coil 2 to the end surface of the stator core 40 without impairing the quality and productivity of the stator 3, and the varnish can be prevented from adhering to the varnish non-adhesive portion 41.

It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention. For example, the ring-shaped member 50 and the string 51 described above can be combined and disposed on the outer peripheral portion of the coil 2.
When the string 51 is used, the string 51 may be wound around the outer peripheral portion of the coil 2 after setting the stator in the varnish processing apparatus 1.

It is a front view which shows schematic structure of the varnish processing apparatus which concerns on embodiment. It is a side view which shows schematic structure of the varnish processing apparatus which concerns on embodiment. It is a principal part enlarged view of the stator holding | maintenance part shown in FIG. It is a top view which shows schematic structure of the stator which concerns on this Embodiment. It is a figure which shows the arrangement | positioning position of a ring-shaped member. It is explanatory drawing which shows the state which is implementing the varnish process to the stator which arrange | positioned the ring-shaped member in the coil outer peripheral part. It is explanatory drawing which shows the state which is implementing the varnish process to the stator which wound the string around the coil outer peripheral part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Varnish processing apparatus 2 Coils 3 and 3a Stator 4 Stator holding | maintenance part 7, 8, 9, 10 Varnish dripping nozzle 40 Stator core 41 Varnish non-adhesion site | part 50 Ring-shaped member 51 String

Claims (8)

In the varnish treatment method of dripping and impregnating the varnish to the coil while rotating the stator core on which the coil is mounted,
A varnish treatment method, wherein a varnish is dropped onto the coil in a state where a ring-shaped member is disposed on an end surface of the stator core and on an outer peripheral portion of the coil. In the varnish processing method of Claim 1,
The varnish treatment method, wherein the ring-shaped member is formed of a material having liquid absorbency. In the varnish processing method of Claim 1 or Claim 2,
The varnish treatment method, wherein the ring-shaped member is shorter than the circumference of the coil and has elasticity. In the varnish processing method of Claim 1 or Claim 2,
The varnish processing method, wherein the ring-shaped member is a string. In a stator with a coil mounted on the stator core,
A stator having a ring-shaped member disposed on an end surface of the stator core and an outer peripheral portion of the coil. The stator according to claim 5,
The said ring-shaped member is formed with the material which has a liquid absorptivity, The stator characterized by the above-mentioned. The stator according to claim 5 or claim 6,
The stator, wherein the ring-shaped member is shorter than the circumference of the coil and has elasticity. The stator according to claim 5 or claim 6,
The stator, wherein the ring-shaped member is a string.

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