JP5444770B2 - Insulated bobbin, rotating electric machine stator, and method of manufacturing rotating electric machine stator - Google Patents

Description

  The present invention relates to an insulating bobbin, a stator for a rotating electrical machine, and a method for manufacturing a stator for a rotating electrical machine.

  As this type of technology, the technology described in Patent Document 1 below is disclosed. In this publication, a temperature detecting element for detecting the temperature of the winding is inserted together with a guide for holding the temperature element in a coil end portion of an insulating bobbin interposed between the winding and the teeth of the stator core. Are disclosed. The guide has a hook part that can be elastically deformed, and the temperature detecting element is pressed inside the winding by the elasticity of the hook part.

JP 2003-92858 A

  In order to improve the heat dissipation of the stator, an impregnating material is impregnated between the stator core and the insulating bobbin. However, since the heat of the stator core is transmitted to the temperature detecting element through the impregnating material, the temperature detected by the temperature detecting element This is likely to be affected by the heat of the stator core, which may reduce the temperature detection accuracy of the winding.

  The present invention has been made paying attention to the above-mentioned problem, and its object is to provide an insulating bobbin capable of suppressing a decrease in the temperature detection accuracy of the winding, a stator of the rotating electrical machine, and a stator of the rotating electrical machine. It is to provide a manufacturing method.

In order to achieve the above object, according to the present invention, an air gap groove formed at a position on the back surface side of the temperature detecting element fixing groove on the inner peripheral surface that is the back surface side of the winding surface of the insulating bobbin, and the insulating bobbin a inner peripheral surface of the impregnated material dropping groove formed in a position you face the air gap groove is provided, and so dripping the impregnant to impregnate material dropping groove.

  As described above, when the impregnating material is dropped into the impregnating material dropping groove, the impregnating material is accumulated in the impregnating material dropping groove, and the accumulated impregnating material fills a slight gap between the stator core and the insulating bobbin by a capillary phenomenon. On the other hand, in a place where there is a gap groove, the gap groove enlarges the gap between the stator core and the insulating bobbin, making it difficult for the capillary phenomenon to work and making it difficult for the gap groove to be filled with the impregnation material. When the impregnating material is not filled, the thermal resistance of the portion increases, and the temperature detection element fixed to the temperature detection element fixing groove formed on the back surface of the gap groove is less susceptible to the heat of the stator core. Therefore, it is possible to suppress a decrease in the temperature detection accuracy of the winding.

It is a perspective view of the status lot of Example 1. FIG. It is the figure which looked at the status lot of Example 1 from the inner peripheral side of the slot. It is the figure which looked at the status lot of Example 1 from the outer peripheral side of the slot. It is the figure which looked at the status lot of Example 1 from the side surface side. It is the figure which looked at the status lot of Example 1 from the upper surface. 3 is a perspective view of an insulating bobbin according to Embodiment 1. FIG. 1 is a cross-sectional view of a stator lot of Example 1. FIG. It is an enlarged view of the stator lot of Example 1. FIG. It is the figure which looked at the insulation bobbin of Example 1 from the 1st short side part side.

[Example 1]
〔Constitution〕
1 is a perspective view of the status lot 7, FIG. 2 is a view of the status lot 7 viewed from the inner periphery side of the slot, FIG. 3 is a view of the status lot 7 viewed from the outer periphery side of the slot, and FIG. FIG. 5 is a view of the status lot 7 as viewed from the top.

  The status lot 7 forms a stator by arranging a plurality of status lots 7 in a circle. The status lot 7 has a stator core 1 formed by laminating steel plates, an insulating bobbin 2 as an insulating member covering the periphery of the stator core 1, and a coil 3 (winding) wound around the insulating bobbin 2. .

  FIG. 6 is a perspective view of the insulating bobbin 2. The outer shape of the insulating bobbin 2 is substantially rectangular as shown in FIG. 6, and has a winding surface 20 around which the coil 3 is wound. As shown in FIGS. 1 to 5, when the coil 3 is laminated on the winding surface 20 and wound on the winding surface 20, an inner diameter side flange 21 (flange) that protrudes in the stacking direction of the coil 3. And an outer diameter side flange 25. The winding surface 20 is formed along the outer periphery of the insulating bobbin 2, the shape of this periphery is substantially rectangular, and has a first short side portion 20a and a second short side portion 20b. The coil 3 starts to be wound from the first short side portion 20a that is one short side portion of the winding surface 20, and the winding ends at the same first short side portion 20a. Hereinafter, the first short side 20a side of the insulating bobbin 2 is referred to as a coil end side. A second notch 26 is formed at a position corresponding to the first short side 20a, and the end of the coil 3 wound around the winding surface 20 is inserted into the second notch 26.

  Further, a temperature sensor fixing groove 27 (temperature detection element fixing groove) which is a concave groove connected to the outside is formed in the first short side portion 20a on the coil end side. 7 is a cross-sectional view taken along line AA in FIG. 5, and FIG. 8 is an enlarged view of the vicinity of the temperature sensor fixing groove 27 in FIG. As shown in FIG. 8, the temperature sensor fixing groove 27 is formed so that h <r, where h is the depth of the temperature sensor fixing groove 27 and r is the diameter of the temperature sensor 6.

  The first notch portion 22 (in the position corresponding to both the second short side portion 20b which is the other short side portion of the winding surface 20 of the insulating bobbin 2 of the inner diameter side flange 21 and the first short side portion 20a described above. A notch) is formed. As shown in FIG. 2, the first notch 22 is notched so that the space between the first short side 20a and the second short side 20b of the winding surface 20 and the coil 3 is exposed to the outside. .

  Further, as shown in FIG. 6, the insulating bobbin 2 is formed with a through-hole 24 that penetrates between two surfaces excluding the four surfaces on which the winding surface 20 is formed. The inner peripheral surface of the through hole 24 is formed in a substantially rectangular shape, and a first short side portion 24a formed on the coil end side and a second short side formed at a position facing the first short side portion 24a. Side 24b. A gap groove 28 that is a concave groove is formed in the first short side portion 24a. FIG. 9 is a view of the insulating bobbin 2 as viewed from the first short side 20a side. As shown in FIG. 9, the temperature sensor fixing groove 27 and the gap groove 28 are arranged so that the gap groove 28 overlaps the temperature sensor fixing groove 27 when the insulating bobbin 2 is viewed from the first short side portion 20 a of the winding surface 20. Is formed. Further, a varnish dropping groove 23 (impregnating material dropping groove) which is a concave groove is formed in the second short side portion 24b. The varnish dripping groove 23 is formed over the entire axial length of the through hole 24, and has an opening 23 a when an inner peripheral portion 1 a of a stator core described later is inserted into the insulating bobbin 2.

  The stator core 1 is formed by laminating substantially T-shaped steel plates. The substantially T-shaped foot portion is the inner peripheral portion 1a, and the substantially T-shaped horizontal bar portion is the outer peripheral portion 1b. ing. The legs on the inner peripheral part 1a side of the stator core 1 are inserted into the through holes 24 of the insulating bobbin 2 as shown in FIGS.

The coil 3 and the temperature sensor 6 are attached to the insulating bobbin 2 in the following procedure. First, the temperature sensor 6 is mounted in the temperature sensor fixing groove 27. Second, the coil 3 is wound around the winding surface 20 from above the temperature sensor 6. The temperature sensor 6 can be pressed against the coil 3 by the winding tension of the coil 3.
The coil 3 and the temperature sensor 6 may be attached to the insulating bobbin 2 by the following procedure. First, the coil 3 is wound around the winding surface 20. Second, the temperature sensor 6 is press-fitted into the temperature sensor fixing groove 27. By press-fitting, the temperature sensor 6 can be pressed against the coil 3.

  After mounting the coil 3 and the temperature sensor 6 on the insulating bobbin 2, the varnish 5 (impregnating material) is dropped into the gap between the coil 3 and the temperature sensor 6 exposed at the first notch 22 on the coil end side. When the varnish 5 is dropped, a so-called capillary phenomenon occurs in which the varnish 5 impregnates the gap between the coil 3 and the temperature sensor 6 and the gap between the coil 3 and the coil 3. By impregnating the gap between the coil 3 and the coil 3, the gap between the coil 3 and the temperature sensor 6 and the gap between the coil 3 and the winding surface 20 are filled with the varnish 5. Further, after inserting the stator core 1 into the through hole 24 of the insulating bobbin 2, the varnish 5 is dropped into the varnish dropping groove 23. The dropped varnish 5 impregnates the gap between the surface of the through-hole 24 of the insulating bobbin 2 and the surface of the stator core 1 and fills the gap between the insulating bobbin 2 and the stator core 1 with the varnish 5.

[Action]
The heat generated by the coil 3 is transmitted to the stator core 1 and radiated through the stator core 1. Therefore, it is required to improve the heat transfer efficiency from the coil 3 to the stator core 1. By simply mounting the coil 3 stator core 1 on the insulating bobbin 2, there are gaps between the winding surface 20 of the insulating bobbin 2 and the coil 3 and between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1. Therefore, the heat conduction efficiency from the coil 3 to the stator core 1 is not so high. Therefore, the varnish 5 which is a heat conductive member is filled between the winding surface 20 of the insulating bobbin 2 and the coil 3 and between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1. .

  On the other hand, a temperature sensor 6 is attached to the insulating bobbin 2 in order to measure the temperature of the coil 3. This temperature sensor 6 wants to measure only the temperature of the coil 3, but between the winding surface 20 of the insulating bobbin 2 and the coil 3 and between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1. Since the varnish 5 is filled, the temperature detected by the temperature sensor 6 is easily affected by the heat of the stator core 1, and the temperature detection accuracy of the coil 3 may be lowered.

  Therefore, in the first embodiment, the air gap groove 28 is formed on the inner peripheral surface of the through hole 24 of the insulating bobbin 2 at a position overlapping the temperature sensor fixing groove 27 when viewed from the coil end side of the insulating bobbin 2. A varnish dropping groove 23 for dropping the varnish 5 at a position different from the groove 28 was formed. That is, the varnish 5 dropped into the varnish dropping groove 23 can impregnate the gap between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1, but the inner peripheral surface of the through hole 24 of the insulating bobbin 2 The gap groove 28 is larger than the gap between the stator core 1 and the gap groove 28 cannot be impregnated. Therefore, the lower portion of the temperature sensor fixing groove 27 can be a gap.

  In the first embodiment, the depth h of the temperature sensor fixing groove 27 is shallower than the diameter r of the temperature sensor 6. That is, the temperature sensor 6 mounted in the temperature sensor fixing groove 27 can be brought into contact with the coil 3.

  In the first embodiment, the varnish is dropped between the winding exposed in the first cutout 22 and the temperature sensor 6. That is, the gap between the coil 3 and the temperature sensor 6 can be filled with the varnish 5, and the temperature transmission efficiency from the coil 3 to the temperature sensor 6 is improved.

〔effect〕
The effects of Example 1 are listed below.
(1) An insulating bobbin 2 that is wound so that the stator core 1 is accommodated on the inner periphery and the coil 3 is laminated on the outer periphery, and the winding surface 20 that is wound so as to laminate the coil 3; 20, a temperature sensor fixing groove 27 for fixing the temperature sensor 6 for detecting the temperature of the coil 3, an inner peripheral surface formed on the inner periphery that accommodates the stator core 1, an inner peripheral surface, and an inner peripheral surface The temperature sensor fixing groove 27 formed on the winding surface 20 on the back surface side of the groove and the gap groove 28 formed at a position overlapping with the winding surface 20 side, and the inner circumferential surface formed at a position different from the gap groove 28. A varnish dropping groove 23 for dropping the varnish 5 was provided.
Therefore, when the varnish 5 is dropped into the varnish dropping groove 23, the impregnating material is accumulated in the varnish dropping groove 23, and the accumulated varnish 5 fills a slight gap between the stator core 1 and the insulating bobbin 2 by capillary action. On the other hand, in the place where the gap groove 28 is present, the gap groove 28 enlarges the gap between the stator core 1 and the insulating bobbin 2, and it becomes difficult for the capillary phenomenon to work, and the gap groove 28 is hardly filled with the varnish 5. If the varnish 5 is not filled, the thermal resistance of that portion increases, and the temperature sensor 6 fixed to the temperature sensor fixing groove 27 formed on the back surface of the gap groove 28 is less susceptible to the heat of the stator core 1. Therefore, it is possible to suppress a decrease in the temperature detection accuracy of the coil 3.

(2) Insulating bobbin 2 wound so that coil 3 is laminated on winding surface 20, stator core 1 housed on the inner periphery of insulating bobbin 2, temperature sensor 6 for detecting the temperature of coil 3, and winding A temperature sensor fixing groove 27 that is formed on the surface 20 and fixes the temperature sensor 6, and an inner peripheral surface of the through hole 24 of the insulating bobbin 2, and when viewed from the radial direction of the insulating bobbin 2, the temperature sensor fixing groove 27 And a varnish dropping groove 23 for dropping the varnish 5 on the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and at a position different from the gap groove 28.
The varnish 5 dropped into the varnish dripping groove 23 can impregnate the gap between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1, but the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1. The gap groove 28 is larger than the gap between the gap groove 28 and the gap groove 28 cannot be impregnated. Therefore, the lower portion of the temperature sensor fixing groove 27 can be a gap. Therefore, the gap groove 28 becomes a heat insulating layer, and the temperature sensor 6 can measure only the temperature of the coil 3, and the temperature measurement accuracy of the temperature sensor 6 can be improved. Further, the gap groove 28 serves as a cushion, and the force acting in the direction of pressing the temperature sensor 6 from the coil 3 can be reduced.

(3) The depth of the temperature sensor fixing groove 27 is shallower than the diameter of the temperature sensor.
Therefore, the temperature sensor 6 can be brought into contact with the coil 3, and the temperature measurement accuracy of the temperature sensor 6 can be improved.

(4) Formed on the inner surface side flange 21 formed on the winding surface 20 and projecting along the stacking direction of the coil 3, and cut on the inner surface side flange 21 so that the space between the coil 3 and the temperature sensor 6 is exposed. The cutout first cutout 22 is provided, and the varnish 5 is dropped into the gap between the coil 3 and the temperature sensor 6 exposed at the cutout 22.
Therefore, the gap between the coil 3 and the temperature sensor 6 can be filled with the varnish 5, the temperature transmission efficiency from the coil 3 to the temperature sensor 6 can be improved, and the temperature measurement accuracy of the temperature sensor 6 can be improved.

(5) Insulating bobbin 2 wound so that coil 3 is laminated on winding surface 20, stator core 1 housed on the inner periphery of insulating bobbin 2, temperature sensor 6 for detecting the temperature of coil 3, and winding A temperature sensor fixing groove 27 formed on the surface 20 for fixing the temperature sensor 6 and an inner peripheral surface of the insulating bobbin 2 at a position overlapping the temperature sensor fixing groove 27 when viewed from the radial direction of the insulating bobbin 2. The formed gap groove 28 and the inner peripheral surface of the insulating bobbin 2 and a varnish dropping groove 23 formed at a position different from the gap groove 28 are provided, and the varnish 5 is dropped into the varnish dropping groove 23. Varnish dropping The varnish 5 dripped into the groove 23 can impregnate the gap between the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1, but the inner peripheral surface of the through hole 24 of the insulating bobbin 2 and the stator core 1 can be impregnated. The gap groove 28 is more than the gap. The gap is large and the gap groove 28 cannot be impregnated. Therefore, the lower portion of the temperature sensor fixing groove 27 can be a gap. Therefore, the gap groove 28 becomes a heat insulating layer, and the temperature sensor 6 can measure only the temperature of the coil 3, and the temperature measurement accuracy of the temperature sensor 6 can be improved. Further, the gap groove 28 serves as a cushion, and the force acting in the direction of pressing the temperature sensor 6 from the coil 3 can be reduced.

[Other embodiments]
The best mode for carrying out the present invention has been described based on the first embodiment. However, the specific configuration of the present invention is not limited to the first embodiment and does not depart from the gist of the present invention. Any change in the design of the range is included in the present invention.
For example, in the first embodiment, the end portion of the coil 3 is inserted into the second cutout portion 26 of the outer diameter side flange 25, but the winding surface 20 is formed at the first cutout portion 22 of the inner diameter side flange 21. If the gap between the second short side 20b and the coil 3 is exposed to the outside, the end of the coil 3 may be inserted into the inner diameter side flange 21.

1 Stator core 2 Insulated bobbin 3 Coil (winding)
5 Varnish (impregnating material)
6 Temperature sensor (temperature detection element)
7 Status lot 20 Winding surface 21 Inner diameter side flange (flange)
22 First notch (notch)
23 Varnish dripping groove (impregnating material dropping groove)
23a Opening 24 Through-hole 27 Temperature sensor fixing groove (Temperature detecting element fixing groove)
28 gap groove

Claims (5)

An insulating bobbin which is wound so as to accommodate a stator core on the inner periphery and to stack windings on the outer periphery,
A winding surface for winding the windings to be laminated;
A temperature detecting element fixing groove formed on the winding surface and fixing a temperature detecting element for detecting the temperature of the winding;
An inner peripheral surface formed on an inner periphery accommodating the stator core , on the back side of the winding surface;
A said inner peripheral surface, with a gap groove formed in the rear side of the front Stories temperature detection element fixing groove position,
A said inner peripheral surface and formed at a position you face the gap grooves, the impregnant dropping groove of dropping impregnant,
An insulating bobbin characterized by comprising An insulating bobbin wound so that the winding is laminated on the winding surface;
A stator core accommodated in the inner periphery of the insulating bobbin;
A temperature detecting element for detecting the temperature of the winding;
A temperature detection element fixing groove formed on the winding surface and fixing the temperature detection element;
Wherein a inner circumferential surface of the rear side of the winding surface of the insulating bobbin, and the gap grooves formed on the rear side of the front Stories temperature detection element fixing groove position,
A inner peripheral surface of the insulating bobbin, and formed at a position you face the gap grooves, the impregnant dropping groove of dropping impregnant,
A stator for a rotating electrical machine, characterized by comprising: The stator of the rotating electrical machine according to claim 2 ,
A stator of a rotating electrical machine, wherein a depth of the temperature detection element fixing groove is shallower than a diameter of the temperature detection element. In the stator of the rotating electrical machine according to claim 2 or 3 ,
A flange that is formed on the winding surface and protrudes along the stacking direction of the windings;
A notch formed in the flange and notched so as to expose a space between the winding and the temperature detection element;
Provided,
A stator for a rotating electrical machine, wherein an impregnating material is dropped between the winding exposed at the notch and the temperature detection element. An insulating bobbin wound so that the winding is laminated on the winding surface;
A stator core accommodated in the inner periphery of the insulating bobbin;
A temperature detecting element for detecting the temperature of the winding;
A temperature detection element fixing groove formed on the winding surface and fixing the temperature detection element;
A inner peripheral surface of the rear side of the winding surface of the insulating bobbin, and the gap grooves which are formed on the back side and the ing position before Symbol temperature detection element fixing groove,
A inner peripheral surface of the insulating bobbin, and the impregnated material dropping groove formed in a position you face the gap grooves,
Provided,
A method of manufacturing a stator for a rotating electrical machine, wherein an impregnating material is dropped into the impregnating material dropping groove.

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