JPS6152122A - Insulation mechanism for stator - Google Patents

Abstract

PURPOSE:To fix an inserted tie easily and exactly, by a method wherein jointed sections between an inserted tie and a slot liner or stator core adjacent to the tie are filled up with adhesives. CONSTITUTION:On the inner circumferential face of a stator core 2, slots 4 with openings 3 are arranged at equal intervals in the direction of the circumference. And coils 5 are arranged inside slot liners 6 so that the coils 5 may be arranged along the inner circumferential face of the slots 4. And inserted ties 7 are inserted between the coils 5 and the openings 3, and the coils 5 are prevented from springing out and are arranged to be electrically insulated from the stator core 2. Jointed sections 8, 10 between the inserted tie 7 and the slot liner 6 or stator core 2 adjacent to the tie 7 are filled up with adhesives 9. As a result, the inserted ties can be exactly fixed with a small quantity of adhesives.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is applicable to electric motors and starters! Regarding the insulation structure of stators such as.

[Background of the invention]

A stator of a rotating electrical machine is constructed by inserting a sash to prevent the coil from jumping out between a coil placed in a slot and an opening of the slot.

Here, if the ratio of the cross-sectional area of the coil to the cross-sectional area of the slot (hereinafter referred to as slot occupancy rate) is low, the sash may shift from a predetermined insertion position within the slot.

One of the causes of misalignment of the sash is due to shocks and vibrations during transportation and handling after the stator sash is inserted and before varnish treatment.In such cases, the sash and opening are generally It was necessary to add a spacer in between to improve the apparent slot occupancy rate, or to inspect the stator and correct the sash to the specified position before phenol treatment.

However, such conventional work requires new parts such as spacers, which makes parts management difficult, and requires a large number of man-hours to inspect and correct the position of the sash.

Another cause of sash displacement is that when the stator is used without varnish treatment, such as in cooling motors or submersible motors, electromagnetic vibrations and rotational vibrations occur during operation.
In such cases, it has already been proposed to securely fix the coil by tightening it with tape or thread at the ends of the coil. (Utility Model Publication No. 55-111054, Utility Model Application Publication No. 58-17985
(No. 5) However, such fixing of the sashiki has the drawback that it requires a lot of work time.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides an insulating structure for a stator that allows for easy fixation of the sash and has high insulation reliability.

[Summary of the invention]

The features of the present invention include a plurality of slots provided in the stator core, a slot liner arranged along the inner peripheral surface of the slot, a coil arranged inside the slot liner, and a connection between the coil and the slot. and a sash disposed between the slot liner and the stator core, the stator having five joints adjacent to the slot liner or the stator core, wherein at least a portion of the joints are actively filled with an adhesive. The reason is that the adhesive is not actively filled in areas other than the joints. With this configuration, the sash can be reliably fixed to the stator core or slot liner with a small amount of adhesive.

Further, in a preferred embodiment of the present invention, by configuring the adhesive on the outside of the slot at the joint between the sash and the slot liner, the adhesive will not be dislodged by the electromagnetic vibration force of the coil or the stator core.

Another preferred embodiment of the present invention is that adhesive is filled at the opening of the slot at the joint between the inner circumferential surface of the slot and the sash. With this configuration, the opening positions of the slots are precisely arranged on the inner circumferential surface of the stator core, so that the adhesive can be reliably filled into desired locations.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 is a perspective view showing the main parts of the stator, and Figure 2 is a 8I
! This is a south cross section showing an enlarged view of the inside of the slot of stator No. 11/. Here, 1 is a stator, 2 is a stator core, and slots 4 having openings 3 on the inner peripheral surface are arranged at equal intervals in the circumferential direction. Reference numeral 5 denotes a coil 1, which is disposed inside a slot liner 6 arranged along the inner peripheral surface of the slot 4.

Sashiki 7 is inserted between coil 5 and opening 3,
This is to prevent the coil 5 from popping out and to provide electrical insulation between the coil 5 and the stator core 2.

In such a stator 1, the present invention provides a joint 8 between the sash 7 and the adjacent slot liner 6 or stator core 2.
, 106C is actively filled with adhesive 9, and the joint portion 8.
The reason is that the adhesive 9 is not actively filled in areas other than 10.

With such a configuration, the sash 7 can be reliably fixed with a small amount of adhesive 9. Furthermore, the work of fixing the sash 7 is easier than in the past, and the work time can be shortened.

The present inventors conducted the following experiment and confirmed the effect of preventing the removal of the sashiki.

First, prior to the experiment, two drops of phenolic resin (approximately 0.0
5g) Two types of stator 1 were prepared: a stator 1 which was dripped and cured, and a stator 1' in which the sash 7 was not fixed at all. next,
As shown in FIG. 3, the other end of the string 11 engaged with the sash 7 was pulled by the spring gauge 12, and the pulling force was measured. Note that both stators 1.1' have the same specifications except for whether or not they are filled with adhesive 9.

FIG. 6 is a graph of the sashiki pull-out force as a result of an experiment comparing the two. Here, the vertical axis represents the pulling force (kg-f), and the horizontal axis represents the wires of the stator. As can be seen from this figure (the untreated product without adhesive 9 has a pull-out force of 2.5
Although there is a large variation in the range of ~5 kp·f, in the case of the adhesive 9 of the present invention, even when the pull-out force was 10 to 9·f, the sashiki 7 did not move in all the samples.

Next, the locations where the adhesive 9 is filled will be explained.

FIG. 5 is a diagram of the adhesive 90 light filler. Adhesive 9 is discharged or dropped from the tip of syringe 12 to adhere sash 7 to stator core 2 or slot liner 6 at a desired position.

Here, the filling of the adhesive 9 is indicated by the broken line in the figure (5).If the filling is done from the slot 40 opening 3 side, the opening 3 will be filled in the inner peripheral surface of the stator core 2 in the circumferential direction. The adhesive 9 has the effect of making it easier to automate the filling operation.Also, as the syringe 12 is shown by the solid line in the figure, the adhesive 9 is placed between the sash 7 located outside the slot 4 and the slot liner 6. The adhesive 9 may be filled between the coil 5 and the stator core 2 because the outer stator core 2 is not located at the adhesive portion of the slot liner 6. will not be destroyed by electromagnetic vibrations.

Therefore, the adhesive strength of the adhesive 9 does not decrease, and the reliability of the stator 1 is improved.

Another embodiment of the present invention is that a varnish having excellent refrigerant resistance, such as a phenol-modified epoxy varnish, is used as the adhesive 9.The stator 1 constructed in this manner is used in a motor for a refrigerator. The case will be explained below. Fig. 6 is a longitudinal sectional view of a refrigerator motor.

Here, the stator 1 is fitted inside the frame 15. A rotor 14 is arranged inside this stator 1 with a gap G interposed therebetween. A rotor 14 is fixed to one end of the rotating shaft 15, and a piston 16 of a compressor is fixed to the other end. It is a 17-out vibe.

In the refrigerator motor configured as described above, when the rotor 14 is driven during operation, the piston 16, which is provided eccentrically with respect to the center of the rotating shaft 15, rotates within the cylinder 17 and performs a pumping action. Therefore, as shown by the arrow in the figure, the refrigerant is
(The refrigerant is guided into the cylinder 17 from the tube 18 and discharged from the hole 19. Next, the refrigerant cools the end of the coil 5 of the stator 1, and then passes through the gap G and the through hole 20 provided in the rotor 14. The zero output vibe 21 discharged from the outlet vibe 21 is connected to a cooler (not shown),
The refrigerant cooled by the cooler is again circulated to the inlet pipe 18.

In a refrigerator motor that operates in this way, the stator 1 is placed in the refrigerant, so the coil 5 that makes up the stator 1
, Heoligomers are deposited in the refrigerant from insulators or varnishes.

This precipitated oligomer adheres to the wall of the refrigerant passage and reduces the area of the refrigerant passage. As a result, the flowability of the refrigerant decreases (and the refrigerator is unable to achieve its original refrigeration ability).

For this reason, in this example, a varnish with excellent refrigerant properties was used as the adhesive 9, and the sash 7 was fixed with a small amount of varnish, so the amount of oligomers precipitated from the varnish in the refrigerant could be suppressed, and the refrigerating capacity It is possible to suppress the decrease in

In yet another embodiment of the present invention, the adhesive 9 contains a coloring agent, and the colored adhesive is filled in the joint portion 8.10 between the sash 7 and the slot liner 6 or the stator core 2. There is a particular thing.

A transparent polyester film is used as the general coat, the sash 7 and the slot liner 6.

If a transparent adhesive 9 is used for these transparent insulators, the filling state of the adhesive 9 cannot be visually determined.

Here, if a colored adhesive containing a coloring agent is used as the adhesive 9, the penetration state of the adhesive 9 can be determined at once. Therefore, inspection after filling the adhesive 9 is easy, and the sash 7 is easy to inspect.
The reliability of fixing is improved.

Note that the present invention is not limited to the insulating structure within the slot shown in FIG. 2; for example, as shown in FIG. 7, a magnetic wedge 22 may be placed in the opening to connect the wedge 7 and the magnetic y! 22 may be filled with adhesive 9, and g! 22 and the stator core 2 to fix the wedge.

〔Effect of the invention〕

The present invention includes an inner compression coil of a slot liner disposed in a slot of a stator core, and a sash between the coil and the opening of the slot,
The adhesive is filled in the joint between the sash and the adjacent slot liner or stator core, which has the effect of easily and reliably fixing the sash.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the stator of the present invention, Fig. 2 is a cross-sectional view showing the inside of the slot which is the first cause, Fig. 3 is a state diagram of the sashiki being pulled out to confirm the effect of the present invention, Fig. 4 5 is a longitudinal cross-sectional view of a filling state diagram illustrating another embodiment of the present invention, and FIG. FIG. , 1 is a stator, 2 is a stator core, 3 is a piece, 4 is a slot, 5 is a coil, 6 is a slot liner, 7 is a sashiki,
8 and 10 are the joints, 9 is the adhesive, Fig. 5 Hehe~ 2 312I 悌 4 Mouth No. t Nσ2E To Otsu Rec

Claims (1)

[Claims] 1. A plurality of slots provided in the stator core, a slot liner arranged along the inner peripheral surface of the slot, a coil arranged inside the slot liner, and this coil. and a sash disposed between the opening of the slot, and the stator has a joint portion where the sash is adjacent to the slot liner or the stator core, wherein adhesive is applied to at least a portion of the joint portion. An insulating structure for a stator, characterized in that the adhesive is actively filled, and the adhesive is not actively filled in areas other than the joints. 2. The stator insulation according to claim 1, wherein the adhesive is filled in a portion located outside the stator core at a joint between the sash and the slot liner. structure. 3. The stator insulation structure according to claim 1, wherein the adhesive is filled in a joint between the sash and the inner circumferential surface of the slot of the stator core. 4. The stator insulation structure according to claim 1, wherein the adhesive is a varnish having excellent refrigerant resistance. 5. The stator insulation structure according to claim 1 or 3, wherein the adhesive contains a coloring agent.