JP6690342B2 - Method for impregnating varnish and apparatus for impregnating varnish - Google Patents

Description

  The present invention relates to a varnish impregnation method and a varnish impregnation apparatus.

  BACKGROUND ART Conventionally, for example, various techniques are known in which a winding is mounted on a stator core of a stator of a motor, and then the winding of the stator, which is the object to be processed, is impregnated with varnish (Patent Document 1). Impregnation of the winding with varnish includes a method of immersing the stator to be treated in the varnish in the tank and a method of dropping the varnish onto the winding while rotating the stator to be treated.

JP 2001-231225 A

  By the way, in the method of immersing the stator to be treated in the varnish in the tank, it is necessary to prepare the varnish to be put in the tank, the yield is low, and the varnish adheres to the surface of the stator core. It is necessary to remove the varnish attached to the surface. When the varnish is dropped onto the winding while rotating the stator core on which the winding is mounted in order to drop the varnish in an amount necessary to improve the varnish, the varnish is difficult to enter and the time required for impregnating the varnish becomes long.

  An object of the present invention is to provide a varnish impregnating method and a varnish impregnating apparatus capable of easily impregnating a winding with varnish.

  The invention according to claim 1 is a method of impregnating a varnish, which comprises rotating the object to be processed while dripping the varnish onto the object to be processed in which the winding is mounted, and impregnating the wire with the varnish. The gist of the invention is to rotate the processed product in both forward and reverse directions while reversing the processed product at three or more locations.

  According to the first aspect of the present invention, the varnish is impregnated in the winding by rotating the workpiece while dropping the varnish on the winding of the workpiece to which the winding is attached. At this time, by rotating the article to be processed in the forward and reverse directions while reversing the article to be treated at three or more places, the winding can be sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish. . That is, if the product to be processed is not rotated, the varnish is simply dropped, but by rotating the product to be processed, the varnish can be spread by the centrifugal force. When the object to be processed is rotated while being inverted, the rotation speed becomes zero at the time of inversion and varnish accumulates (although segregation occurs), but the object to be processed is rotated in both forward and reverse directions while inverting the object to be processed at three or more places. As a result, the varnish pool can be dispersed. Therefore, the winding is sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish.

  As described in claim 2, in the method for impregnating a varnish according to claim 1, after rotating the object to be processed in two directions forward and backward while rotating the object to be processed at three or more places, newly The article to be processed may be rotated in both forward and reverse directions while being inverted at three or more new locations.

  As described in claim 3, in the method for impregnating a varnish according to claim 1 or 2, it is preferable that the object to be processed is inverted when the rotation of the object to be processed in one direction has passed a predetermined time.

  According to a fourth aspect of the present invention, a nozzle for dropping a varnish for impregnating the winding onto the winding in the workpiece to which the winding is mounted, and the treatment target while dropping the varnish from the nozzle onto the winding. And a controller for controlling the rotating device to rotate the object to be processed bidirectionally while reversing the object to be processed at three or more locations. To do.

  According to the invention as set forth in claim 4, the varnish for impregnating the winding in the object to which the winding is mounted is dropped onto the winding from the nozzle, and the varnish is dropped onto the winding from the nozzle by using the rotating device. While rotating the article to be processed. At this time, the controller controls the rotating device to rotate the object to be processed bidirectionally while reversing the object to be processed at three or more locations. Thereby, the winding is sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish. That is, if the product to be processed is not rotated, the varnish is simply dropped, but by rotating the product to be processed, the varnish can be spread by the centrifugal force. When the object to be processed is rotated while being inverted, the rotation speed becomes zero at the time of inversion and varnish accumulates (although segregation occurs), but the object to be processed is rotated in both forward and reverse directions while inverting the object to be processed at three or more places. As a result, the varnish pool can be dispersed. Therefore, the winding is sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish.

  As described in claim 5, in the varnish impregnating device according to claim 4, the controller rotates the object to be processed bidirectionally while reversing the object to be processed at the three or more locations. After that, it is advisable to newly rotate the article to be processed at three or more new locations and rotate it in both forward and reverse directions.

  As described in claim 6, in the varnish impregnating device according to claim 4 or 5, the controller controls the object to be treated when the object to be treated is rotated in one direction for a predetermined time. It is preferable to have two or more timers for reversing.

  According to the present invention, the winding can be easily impregnated with the varnish.

1 is a schematic configuration diagram of a varnish impregnating device according to an embodiment. 1A is a view as viewed from the direction of arrow A in FIG. 1, and FIG. Explanatory drawing for demonstrating the effect | action of the impregnating device of a varnish. A time chart for explaining operation of a varnish impregnating device. The partial expansion schematic diagram of a stator for explaining an operation of a varnish impregnation device. Explanatory drawing for demonstrating the effect | action of the impregnating apparatus of the varnish of another example. The time chart for demonstrating the effect | action of the impregnating apparatus of the varnish of another example.

An embodiment in which the present invention is embodied in varnish impregnation in a stator of a three-phase motor will be described below with reference to the drawings.
As shown in FIG. 1, a varnish impregnating device 10 includes a rotating device 20 and a controller 30. The rotating device 20 is for rotating the stator 40 in which the winding (coil) 42 is mounted on the stator core 41.

  As shown in FIGS. 2 (a) and 2 (b), the stator 40, which is an object to be processed, has a plurality of slots 43 formed in the circumferential direction on the inner surface side of a cylindrical stator core 41. Each slot 43 is open on the inner peripheral surface. Each slot 43 extends in the axial direction of the stator core 41, and is open at both end surfaces of the stator core 41. The winding 42 is inserted in the slot 43 in a wound state. The winding 42 is distributed around the stator core 41, that is, the winding 42 is wound over several slots. As shown in FIG. 1, windings 42 project from both end surfaces of the stator core 41 in the axial direction of the stator core 41, and form coil ends 42a and 42b. The winding 42 is wound in a state in which wire rods are stacked. The stator 40 (stator core 41) is set in the varnish impregnating device 10 with the axis L1 horizontal.

  As shown in FIGS. 1 and 2, the varnish impregnation apparatus 10 includes nozzles 60, 61, 62 and 63 for dropping varnish (insulating varnish) Vi. A tank is connected to each of the nozzles 60 to 63 via a tube, and a liquid varnish is supplied from the tank to the nozzles 60 to 63 via the tube. The nozzles 60, 61, 62, 63 are provided on the upper side of the winding in order to drop the varnish Vi by its own weight. The nozzle 60 is installed above the outer peripheral side of the winding 42 (coil end 42a) protruding from one end surface of the stator core 41, and the winding 42 (coil end 42a) protruding from the nozzle 60 from one end surface of the stator core 41. The varnish Vi is dripped from above the outer peripheral side. The nozzle 61 is installed above the inner peripheral side of the winding 42 (coil end 42a) protruding from one end surface of the stator core 41, and the winding 42 (coil end 42a) protruding from the nozzle 61 from one end surface of the stator core 41. The varnish Vi is dripped from above on the inner peripheral side. The nozzle 62 is installed above the outer circumference of the winding 42 (coil end 42b) protruding from the other end surface of the stator core 41, and the winding 42 (coil end 42b) protruding from the nozzle 62 from the other end surface of the stator core 41. The varnish Vi is dripped from above the outer peripheral side. The nozzle 63 is installed above the inner peripheral side of the winding 42 (coil end 42b) protruding from the other end surface of the stator core 41, and the winding 42 (coil end 42b) protruding from the nozzle 63 from the other end surface of the stator core 41. The varnish Vi is dripped from above on the inner peripheral side. A constant varnish is constantly dropped from each of the nozzles 60 to 63.

  The rotating device 20 includes an inner diameter chuck portion 21 that rotatably holds a stator 40 that is a work, a shaft 22 that extends in the horizontal direction, and a motor 23 that rotates the shaft 22.

The inner diameter chuck portion 21 is arranged inside the stator core 41 and holds (chucks) the inner surface of the stator core 41.
A shaft 22 extends from the inner diameter chuck portion 21. The shaft 22 is arranged on the axis L1 of the stator core 41. A motor 23 is connected to the shaft 22. Then, the shaft 22 is rotated by the motor 23, and this rotation causes the stator 40 held by the inner diameter chuck portion 21 to rotate about the axis L1 of the stator 40 as a rotation axis. The rotating device 20 can be used to rotate the stator 40 bidirectionally. Specifically, for example, when the motor 23 is controlled by an inverter, the stator 40 can be rotated bidirectionally by controlling the inverter. Further, the stator 40 is rotated at a constant speed.

  In this way, the nozzles 60 to 63 drop the varnish Vi that impregnates the winding wire 42 of the stator 40 as the object to be processed with the winding wire 42 mounted on the winding wire 42 (coil ends 42a, 42b). The rotating device 20 is for rotating the stator 40 while dropping the varnish Vi from the nozzles 60 to 63 onto the winding 42 (coil ends 42a and 42b).

  The controller 30 controls the rotating device 20 (motor 23) to rotate the stator 40. At this time, the controller 30 periodically switches the rotation direction to eliminate the slots that are not impregnated. That is, as shown in FIG. 3, the stator 40 is rotated in both directions while reversing it at predetermined positions every 120 ° in one rotation of 360 °. That is, the stator 40 is rotated bidirectionally while reversing the stator 40 at three or more positions (PH1, P11, P12, etc.) within the entire rotation range of the stator 40.

  In the present embodiment, as the varnish Vi dropped from the nozzles 60, 61, 62, 63, a varnish having a low curing temperature is used. That is, a varnish that is cured without undergoing a temperature raising process using a furnace or the like is used. That is, it is dropped and impregnated at the polymerization temperature (curing temperature). Therefore, unless the varnish is impregnated into the winding early, the varnish will be cured before it is impregnated into the winding.

Next, the operation will be described in detail with reference to FIGS.
FIG. 3 is a schematic view of the stator 40 as seen from the arrow A of FIG. 1, and shows the rotating operation of the stator 40. In FIG. 3, the rotation of the stator 40 is started from the position PH1 right above and the position PH1 → position P11 → position P12 → position PH1 → position P11 → position P12 → position PH2 → position P21 → position P22 → position PH2 → position. The state of returning from P21 → position P22 → position PH1 is shown.

  In FIG. 4, the horizontal axis represents time and the vertical axis represents the rotation speed of the stator 40. On the vertical axis, the upper side shows the forward rotation side with respect to the rotational speed of 0 (zero), and the lower side shows the reverse rotation side with respect to 0 (zero). In this embodiment, the forward rotation side is clockwise in FIG. 3, and the reverse rotation side is counterclockwise in FIG. FIG. 4 shows the rotation speed and the rotation direction when the rotation operation of FIG. 3 is executed.

FIG. 5 is a development view of the end portion of the stator core 41 and the coil ends 42a and 42b, showing the spread of the varnish from the varnish dropping position.
The stator 40 to be impregnated with the varnish Vi, that is, the stator 40 in which the winding 42 is mounted on the stator core 41 is set in the varnish Vi impregnation device 10. Specifically, the inner diameter chuck portion 21 of the rotating device 20 holds (chucks) the inner diameter surface of the stator core 41. Further, the nozzles 60, 61, 62, 63 are arranged at predetermined varnish dropping positions.

  The controller 30 controls the motor 23 of the rotating device 20 to rotate the stator 40 while dropping the varnish Vi from the nozzles 60 to 63 onto the winding 42 (coil ends 42a and 42b). As a result, as shown in FIG. 5, the varnish Vi is propagated (impregnated) from the varnish dropping position to impregnate the coil ends 42a and 42b and the coil ends 42a and 42b into the slot 43. The controller 30 controls the motor 23 as follows.

  The controller 30 rotates the stator 40 bidirectionally while reversing the stator 40 at three or more locations. At this time, the controller 30 has three or more timers for reversing the stator 40 when the rotation of the stator 40 in one direction has passed a predetermined time.

This will be described in more detail.
In FIG. 3, the 12 o'clock position PH1 on the timepiece dial is the impregnation start position (home position) that serves as the reference of the stator 40 and the reversal position, and the 4 o'clock position on the timepiece dial is the first inversion. The position P11 is the second inverted position P12 at the 8 o'clock position on the dial of the timepiece.

  Then, as shown in FIG. 4, the rotation of the stator 40 is started from the impregnation start position (home position) indicated by PH1, and the stator 40 is rotated clockwise (normal rotation) for a predetermined time T1. The predetermined time T1 is a time for rotating the stator 40 by + 120 °.

  Then, at the first reversal position P11 rotated by + 120 °, the stator 40 is reversed to rotate the stator 40 counterclockwise (reverse rotation) for a predetermined time T2. The predetermined time T2 is a time for rotating the stator 40 by −240 °.

  Then, the stator 40 is inverted at the second inversion position P12 rotated by −240 °, and the stator 40 is rotated clockwise (normal rotation) for the predetermined time T3. The predetermined time T3 is a time for rotating the stator 40 by + 120 °.

  Then, the stator 40 is reversed at the reverse position PH1 rotated by + 120 °. Subsequently, the stator 40 is rotated counterclockwise (reverse rotation) for a predetermined time T4. The predetermined time T4 is a time for rotating the stator 40 by −240 °.

  The stator 40 is reversed at the first reversal position P11 rotated by −240 °, and the stator 40 is rotated clockwise (normal rotation) for a predetermined time T5. The predetermined time T5 is a time for rotating the stator 40 by + 120 °. Then, the stator 40 is inverted at the second inversion position P12 rotated by + 120 °, and the stator 40 is rotated counterclockwise (reverse rotation) for a predetermined time T6. The predetermined time T6 is a time for rotating the stator 40 by -180 °.

  The process up to this point is the first cycle, in which the first timer rotates the stator 40 by 120 °, the second timer rotates the stator 40 by 240 °, and the third timer rotates the stator 40 by 180 °.

  In the first cycle, the stator 40 is rotated while the varnish Vi is dropped onto the winding 42 of the stator 40 to which the winding 42 is mounted, and the winding 42 is impregnated with the varnish Vi. At this time, the stator 40 is rotated bidirectionally while reversing the stator 40 at three or more locations. When the rotation of the stator 40 in one direction elapses a predetermined time, the stator 40 is reversed.

After the first cycle, the stator 40 is rotated in the second cycle.
In the first cycle (mode 1), the controller 30 rotates the stator 40 bidirectionally while reversing the stator 40 at three or more places, and then newly starts the stator 40 in the second cycle (mode 2). , Rotate bidirectionally while reversing at three or more new places.

  In the second cycle, the position PH2 at 2 o'clock on the dial of the timepiece in FIG. 3 is the new impregnation start position (home position) that serves as the reference of the stator 40 and the reverse position, and is 6 o'clock on the dial of the timepiece. Is the new first inverted position P21, and the 10 o'clock position on the dial of the timepiece is the new second inverted position P22.

  Then, as shown in FIG. 4, the rotation of the stator 40 is started from the impregnation start position (PH2), and the stator 40 is rotated clockwise (normal rotation) for a predetermined time T7. The predetermined time T7 is a time for rotating the stator 40 by + 120 °. Then, at the first reversal position P21 rotated by + 120 °, the stator 40 is reversed to rotate the stator 40 counterclockwise (reverse rotation) for a predetermined time T8. The predetermined time T8 is a time for rotating the stator 40 by −240 °.

  Then, the stator 40 is inverted at the second inversion position P22 rotated by −240 °, and the stator 40 is rotated clockwise (normal rotation) for a predetermined time T9. The predetermined time T9 is a time for rotating the stator 40 by + 120 °. Then, the stator 40 is reversed at the reverse position PH2 rotated by + 120 °. After that, the stator 40 is rotated counterclockwise (reverse rotation) for a predetermined time T10. The predetermined time T10 is a time for rotating the stator 40 by −240 °.

  Then, the stator 40 is inverted at the first inversion position P21 rotated by −240 °, and the stator 40 is rotated clockwise (normal rotation) for the predetermined time T11. The predetermined time T11 is a time for rotating the stator 40 by + 120 °. Then, the stator 40 is inverted at the second inversion position P22 rotated by + 120 °, and the stator 40 is rotated counterclockwise (reverse rotation) for a predetermined time T12. The predetermined time T12 is a time for rotating the stator 40 by −300 °.

  The process up to this point is the second cycle, in which the first timer rotates the stator 40 by 120 °, the second timer rotates the stator 40 by 240 °, and the third timer rotates the stator 40 by 300 °.

  As described above, after rotating the stator 40 in the forward and reverse directions while reversing the stator 40 at three or more places in the first cycle (mode 1), the stator 40 is newly renewed in the second cycle (mode 2). Rotate in both directions, reversing at three or more points.

  In this way, as shown in FIG. 5, the stator 40 is rotated bidirectionally with respect to the varnish dropping position in a state where there are three or more inverting positions (PH1, P11, P12, etc.). By doing so, the varnish Vi after the dropping can be dispersed and impregnated in each part of the coil ends 42a and 42b, and the inside of the slot 43 can be impregnated with the varnish Vi in the axial direction of the stator core 41. The propagating property (impregnating property) of the varnish Vi can be improved.

The winding is impregnated with the varnish Vi while dropping the varnish Vi having a low curing temperature. Then, the winding 42 can be hardened with the varnish (resin) Vi.
As a comparative example, the workpiece (workpiece) is rotated while dropping the varnish. After impregnating the winding with the varnish in this way, the workpiece (workpiece) is placed in a curing furnace. The varnish is cured (polymerized) by passing the work (processed object) through the curing furnace.

  In this case, since the varnish is dripped onto the winding while rotating the stator on which the winding is mounted, it is difficult for the varnish to enter, and the time required for impregnating the varnish is long. Therefore, it is difficult to cure in a short time. In particular, the situation of the winding differs depending on the arrangement of the windings, that is, the winding method of the starter (work). Further, the varnish impregnating device has a complicated mechanism and is expensive.

  On the other hand, in the present embodiment, the winding 42 can be sufficiently impregnated with the varnish Vi. Specifically, as shown in FIG. 5, the propagating property of the varnish Vi after the dropping can be improved by rotating the stator 40 bidirectionally. In addition, it is possible to reduce equipment and improve productivity. Furthermore, since the impregnation time is shortened, it is possible to use the varnish Vi that is cured at a low temperature in a short time, and it is not necessary to perform heating for curing, and a heating furnace for curing is unnecessary. .

  More specifically, while the varnish Vi is being dropped, the stator 40 is rotated bidirectionally to shorten the impregnation time of the varnish Vi. Specifically, for example, the number of revolutions and the direction of revolution are changed by an inverter or the like, and the time until reversal is set using a timer, and the reversal positions are dispersed into three or more positions. Therefore, the equipment is reduced, the productivity is improved, and the varnish Vi having a low curing temperature is cured when impregnated, so that it is not necessary to put it in a drying furnace in a subsequent step.

According to the above embodiment, the following effects can be obtained.
(1) There are three varnish impregnation methods for impregnating the winding with the varnish Vi by rotating the stator 40 while dripping the varnish Vi onto the winding 42 of the stator 40 as the workpiece to which the winding 42 is mounted. PH1, P11, P12) and above, the stator 40 is rotated in both forward and reverse directions while reversing the stator 40. Therefore, the winding 42 is sufficiently impregnated with the varnish Vi by dispersing the inverted portions where the dropped varnish is likely to be accumulated, and the winding 42 can be easily impregnated with the varnish Vi.

  That is, if the stator 40 is not rotated, the varnish is simply dropped, but by rotating the stator 40, the varnish can be spread by the centrifugal force. When the stator 40 is rotated while being inverted, the rotation speed becomes zero at the time of inversion, and varnish accumulates (segregation occurs). Here, the varnish pool can be dispersed by rotating the stator 40 bidirectionally while reversing the stator 40 at three or more locations. Therefore, the winding is sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish.

  (2) After rotating the stator 40 bidirectionally while reversing the stator 40 at three or more locations (PH1, P11, P12) or more, newly replace the stator 40 with three new locations (PH2, P21, P22) or more. Rotates in both directions, reversing with. Therefore, it is possible to further increase the number of reversal points and disperse the varnish pool, so that the winding 42 is more sufficiently impregnated with the varnish Vi, and the winding 42 can be easily impregnated with the varnish Vi.

(3) The stator 40 is reversed when the rotation of the stator 40 in one direction elapses for a predetermined time. Therefore, the inversion of the stator 40 can be easily performed.
(4) Since the dropped varnish sufficiently impregnates the winding, it is more effective for a varnish having a low hardening temperature.

  (5) As the configuration of the varnish impregnating device 10, the nozzles 60 to 63 and the nozzles 60 to 63 that drop the varnish Vi into the winding 42 to impregnate the winding 42 in the stator 40, which is the object to be processed with the winding 42 mounted thereon, are included. The rotating device 20 is provided for rotating the stator 40 while dropping the varnish Vi from 63 onto the winding 42. Further, the varnish impregnating device 10 includes a controller 30 that controls the rotating device 20 to rotate the stator 40 bidirectionally while reversing the stator 40 at three or more locations (PH1, P11, P12). Therefore, the controller 30 controls the rotating device 20 to rotate the stator 40 in three directions (PH1, P11, P12) or more while reversing the stator 40, and the stator 40 is rotated in both forward and reverse directions. After being impregnated, the winding 42 can be easily impregnated with the varnish Vi. That is, if the stator 40 is not rotated, the varnish is simply dropped, but by rotating the stator 40, the varnish can be spread by the centrifugal force. When the stator 40 is rotated while being inverted, the rotation speed becomes zero at the time of inversion and varnish is accumulated (segregation occurs). Here, the varnish pool can be dispersed by rotating the stator 40 bidirectionally while reversing the stator 40 at three or more locations. Therefore, the winding is sufficiently impregnated with the varnish, and the winding can be easily impregnated with the varnish.

  (6) The controller 30 rotates the stator 40 bidirectionally while reversing the stator 40 at three or more locations (PH1, P11, P12) or more, and then newly installs the stator 40 at three new locations (PH2, PH2, PH2, P11, P12). (P21, P22) Rotate in both forward and reverse directions while reversing above. Therefore, it is possible to further increase the number of reversal points and disperse the varnish pool, so that the winding 42 is more sufficiently impregnated with the varnish Vi, and the winding 42 can be easily impregnated with the varnish Vi.

  (7) The controller 30 has three or more timers for reversing the stator 40 when the rotation of the stator 40 in one direction has passed a predetermined time. Therefore, the inversion of the stator 40 can be easily performed.

The embodiment is not limited to the above, and may be embodied as follows, for example.
3 and 4 are examples, and the stator 40 may be rotated bidirectionally while reversing the stator 40 at three or more locations.

  That is, in FIGS. 3 and 4, after rotating the stator 40 bidirectionally while reversing the stator 40 at three locations (PH1, P11, P12), the stator 40 is newly installed at three new locations (PH2, PH2). It rotated in both forward and reverse directions while reversing at P21 and P22).

  Instead of this, for example, it may be as shown in FIGS. That is, while rotating the stator 40 bidirectionally while reversing the stator 40 at three locations (PH1, P11, P12), while reversing the stator 40 at the same three locations (PH1, P11, P12) as in the previous cycle. It may rotate in both forward and reverse directions. At this time, the first timer rotates the stator 40 by 120 °, and the second timer rotates the stator 40 by 240 °. As described above, the controller (30) has two or more timers for reversing the stator 40 when the rotation of the stator 40 in one direction has passed a predetermined time. Therefore, the inversion of the stator 40 can be easily performed.

The stator 40 is rotated at a constant speed and the stator 40 is inverted using a timer, but the invention is not limited to this. For example, the stator 40 may have non-uniform rotation.
The winding 42 is distributedly wound around the stator core 41, but the winding method is not limited to distributed winding, and is a technique effective for all motors such as concentrated winding.

  The object to be processed is the stator 40 in which the winding 42 is mounted on the stator core 41, but it may be an armature (rotor). The object to be processed is not limited to the motor, but may be one having a winding, such as a reactor or a transformer.

  10 ... Varnish impregnating device, 20 ... Rotating device, 30 ... Controller, 40 ... Stator, 42 ... Winding, PH1 ... Inversion position, P11 ... Inversion position, P12 ... Inversion position, PH2 ... Inversion position, P21 ... Inversion position, P22 ... Inversion position, Vi ... Varnish.

Claims (8)

A method for impregnating a varnish, in which a workpiece to which a winding is attached is arranged with its axis being horizontal, and while the varnish is dropped onto the winding, the workpiece is rotated to impregnate the winding with the varnish. ,
Three or more locations including a reference impregnation start position, a first reversal position located on the forward rotation side of the impregnation start position, and a second reversal position located on the reverse rotation side of the impregnation start position. impregnation of varnish and performs position control of the reverse position for rotating said forward and reverse bidirectional said workpieces while reversing the workpieces in.   After rotating the object to be processed in the forward and reverse directions while reversing the object to be processed at the three or more points, newly rotating the object to be processed in the forward and reverse directions at three or more new points. The method for impregnating a varnish according to claim 1, wherein:   The method for impregnating a varnish according to claim 1 or 2, wherein when the rotation of the article to be treated in one direction has passed a predetermined time, the article to be treated is inverted.   The winding has a first coil end protruding from one end surface in the axial direction of the article to be processed and a second coil end protruding from the other end surface,
  The method for impregnating a varnish according to claim 1, wherein the varnish is dropped from both above the first coil end and above the second coil end. A nozzle that drips a varnish to impregnate the winding in the workpiece with the winding attached,
A rotating device for rotating the object to be processed while dropping varnish from the nozzle onto the winding,
By controlling the rotating device , a reference impregnation start position, a first reversal position located on the forward rotation side of the impregnation start position, and a second reversal position located on the reverse rotation side of the impregnation start position. And a controller that performs position control of a reversal position that rotates the object to be processed bidirectionally while reversing the object to be processed at three or more positions including a position ,
The impregnating device for varnish, wherein the article to be treated is set on the rotating device in a state where an axis thereof is horizontal.
The controller rotates the workpiece in both forward and reverse directions while inverting the workpiece at the three or more locations, and then reverses the workpiece at three or more new locations. The varnish impregnating device according to claim 5 , wherein the varnish impregnating device is rotated in opposite directions. 7. The varnish according to claim 5 , wherein the controller has two or more timers for reversing the object to be processed when rotation of the object to be processed in one direction has passed a predetermined time. Impregnation device.   The winding has a first coil end protruding from one end surface in the axial direction of the article to be processed and a second coil end protruding from the other end surface,
  The nozzle has a first nozzle arranged above the first coil end and a second nozzle arranged above the second coil end,
  The varnish impregnating apparatus according to any one of claims 5 to 7, wherein varnish is dropped from both the first nozzle and the second nozzle.

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