JP2004208387A - Stator insulation of motor and stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the stator insulation of a motor in which the insulation in the slot of a stator core is surely performed and which is excellent in cost and a quality. <P>SOLUTION: A concentrated wound motor insulates the teeth of the stator core and directly winds a coil. The motor includes insulation legs respectively extended into the slots from an upper insulation end plate and a lower insulation end plate. The insulation leg of the upper insulation end plate insulates so as to cover the side face of the slot of a first stator core, and the insulation leg of the lower insulation end plate insulates so as to cover the side face of the slot of a second stator core. Further, even if the unevenness of the laminated thickness tolerance of the stator core or the laminated thickness change of the stator slightly occurs by insulating so as to be superposed with the insulation leg of the upper insulation end plate insulated so as to cover the side face of the slot of the first stator core, a necessity to newly form a resin mold is reduced. Further, the insulation failure due to the resistant pressure of the stator core and the winding in the slot can be reduced. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concentrated winding type motor in which the teeth of the stator core are insulated and the windings are wound directly, wherein the both end surfaces of the stator core are insulated by an upper insulating end plate and a lower insulating end plate. On stator insulation and stator.
[0002]
[Prior art]
As shown in FIG. 7, a conventional stator insulation is a stator insulation in which both ends of a stator core around which windings are wound and a slot are integrally formed of synthetic resin with a synthetic resin (for example, see Patent Document 1). Alternatively, as shown in FIG. 8, a separate type resin insulation or the like (for example, see Patent Document 2) in which the stator core is divided into upper and lower parts substantially at the center in the slot and provided with an overlapping portion near the center of the slot. is there.
[0003]
However, these stator insulations have various problems. As shown in FIG. 7, in a motor in which the stator insulation is integrally molded with resin, there is no problem when the thickness of the stator core is the same. It was necessary to manufacture a resin mold.
[0004]
In the case of the separate type resin insulation in which the stator core is divided into upper and lower portions substantially at the center in the slot of the stator core shown in FIG. 8 and the overlap portion is provided in the slot, the resin insulation is overlapped in the slot. The end portion is thinly finished, and the thinly overlapped portion moves back and forth within the thickness tolerance range of the stator core, and a portion that does not reliably overlap is formed. In such a case, the insulation between the winding and the stator core may not be maintained and insulation failure may occur.
[0005]
Further, when used as an insulating material in a severe environment, many expensive materials satisfying the use conditions such as heat resistance and chemical resistance are used, so that the product unit price is high.
[0006]
[Patent Document 1]
JP-A-59-191445 [Patent Document 2]
JP-A-06-78484
[Problems to be solved by the invention]
In FIG. 7, when the thickness is changed due to a specification change or the like, it is necessary to newly manufacture a resin mold. In addition, in the method shown in FIG. 8, when the overlapping is insufficient, there is no thickness of the resin, so that the withstand voltage cannot be maintained between the winding wound around the stator teeth and the stator iron core, and the insulation is not achieved. There was a case where it was defective. In addition, since many expensive materials are used, the unit price of the product is high.
[0008]
[Means for Solving the Problems]
The present invention relates to a concentrated winding type motor in which the teeth of the stator core are insulated and the windings are wound directly, wherein the insulation is insulated at both end surfaces of the stator core by an upper insulating end plate and a lower insulating end plate. In the stator, the slot shape of the stator core is a stepped laminated structure of a first stator core and a second stator core that are larger than the slot shape of the second stator core, The upper insulating end plate and the lower insulating end plate have insulating legs extending into each slot, and the insulating legs of the upper insulating end plate are insulated so as to cover the inner surface of the slot of the first stator core. An upper insulating end insulated so that an insulating leg of the lower insulating end plate covers an inner surface of the slot of the second stator core, and is insulated to cover an inner surface of the slot of the first stator core. Insulating so that it overlaps the insulating legs of the board Even if the thickness tolerance of the stator core varies and the stator thickness changes slightly, a new mold is created by adjusting the degree of overlap between the insulating legs of the upper and lower insulating end plates. This eliminates the necessity, and can reduce insulation failure due to withstand voltage between the stator core and the winding in the slot.
[0009]
Also, since the insulating material of the upper insulating end plate and the lower insulating end plate uses a lot of expensive materials satisfying the use conditions such as heat resistance and chemical resistance, at least one concave portion is provided on the stator core mounting surface side. By providing the groove, the material used can be reduced. In this case, the thickness of the end portions of the stator of the upper insulating end plate and the lower insulating end plate may be any thickness as long as the insulation distance can be secured, and the thickness is not so large because the space is provided in a concave shape.
[0010]
Since the thickness of the insulating legs of the upper insulating end plate and the lower insulating end plate is often poor in insulation due to the withstand voltage between the stator core and the winding, when the thickness of the insulating legs is t, 0 < By setting t ≦ 1.0 mm, insulation failure due to withstand voltage can be reduced.
[0011]
Preferably, the material of the upper insulating end plate and the lower insulating end plate is LCP (liquid crystal polymer) having good flowability of the resin in the resin mold, so that a product having a stable resin molding dimension can be manufactured.
[0012]
By using such stator insulation for a stator of a motor mounted in a compressor for a refrigerator or an air conditioner, a stator for a motor with reduced insulation failure and reduced cost can be manufactured. The same effect can be obtained even when used for a vehicle.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a top view showing a state in which an upper insulating end plate 2 according to an embodiment of the present invention is mounted on a stator core 1. In this embodiment, an upper insulating end plate 2 and a lower insulating end plate 3 are mounted on both ends of a stator core 1. This is a concentrated winding three-phase permanent magnet type electric motor in which a winding 5 is directly wound around the tooth portion 4 on which the upper insulating end plate 2 and the lower insulating end plate 3 are mounted.
[0014]
The number of slots 6 is nine, and the number of magnetic poles is six. The stator core 1 is provided with a bolt hole 7 for fixing the stator core 1. The winding 5 in the present embodiment is indicated by a chain line.
[0015]
The upper insulating end plate 2 shown in FIG. 1 includes a neutral-point-side terminal fixing portion 8 for fixing one end of the winding 5 directly wound around each tooth portion 4, and a lead wire of each phase. There is another lead wire side terminal fixing part 9 to be connected. Each terminal and the winding 5 are fixed by magmate or the like.
[0016]
The lead wire drawn from the lead wire side terminal fixing portion 9 connected to the lead wire of each phase is formed on the outer peripheral wall 11 of the upper insulating end plate 2 provided on the outer peripheral side surface of the winding 5 directly wound around the tooth portion 4. It is wound so as to sew between the irregularities and fixed in a bellows shape, and is stopped by the lead wire fixing hook 10. This ensures that the lead wire is fixed to the upper insulating end plate 2.
[0017]
FIG. 2 is a cross-sectional view taken along the line DD ′ of the tooth portion 4 of the stator core 1 of the electric motor shown in FIG. As can be seen from FIG. 2, the stator core 1 has a stepped laminated structure of a first stator core 1a larger than the shape of the slot 6 of the second stator core 1b and a second stator core 1b. . Since the DD ′ cross-sectional view of FIG. 2 shows only the teeth 4 of the stator core 1, the first stator core 1a is narrower than the tooth width of the second stator core 1b. In this case, the step between the first stator core 1a and the second stator core 1b is set to about 1.0 mm or less.
[0018]
In addition, the end of the stator core 1 has insulating legs 2 a extending from the upper insulating end plate 2 to the inside of the slot 6. In this embodiment, since the number of the slots 6 is nine, the number of the insulating legs 2a is nine. The insulating leg 2a is insulated so as to cover the inner surface of the slot 6 of the first stator core 1a. In this case, the insulating legs 2a are mounted without gaps with the first stator core 1a.
[0019]
FIG. 4 is a view seen from the opposite side of the stator core 1 shown in FIG. A lower insulating end plate 3 is mounted from the end of the stator core 1 opposite to the side on which the upper insulating end plate 2 shown in FIG. 1 is mounted. Inside the slot 6, an insulating leg 3a (see FIG. 2) extends. Reference numeral 13 in the figure denotes a relief portion for fixing the pedestal in the case with a bolt or the like.
[0020]
As in the case of the upper insulating end plate 2, the number of the slots 6 is nine, so that the number of the insulating legs 3a extending from the lower insulating end plate 3 shown in FIG. 2 is nine. This insulating leg 3a is insulated so as to cover the inner surface of the slot 6 of the second stator core 1b, and furthermore, the insulation of the upper insulating end plate 2 mounted on the first stator core 1b described above. The insulating leg 3a of the lower insulating end plate 3 is arranged so as to overlap with the leg 2a.
[0021]
In this case, it is preferable that there is no gap between the insulating leg 2a of the upper insulating end plate 2 and the insulating leg 3a of the lower insulating end plate 3. Therefore, the insulating legs 2a mounted on the stepped portions of the first stator core 1a are made to have approximately the same thickness as the step between the first stator core 1a and the second stator core 1b, so that the upper insulation can be achieved. The overlapping portion of the insulating leg 2a of the end plate 2 and the insulating leg 3a of the lower insulating end plate 3 can be mounted without a gap.
[0022]
As a result, the insulating legs 2a and 3a can be reliably overlapped with each other, so that the upper insulating end plate 2 and the lower insulating end plate 3 can be arranged even if the thickness of the stator changes due to variations in the thickness tolerance or slight differences in output. Only by adjusting the degree of overlap between the insulating legs 2a and 3a, eliminating the need to make a new mold. In addition, the overlapping of the insulating legs 2a and 3a of the upper insulating end plate 2 and the lower insulating end plate 3 is possible. Since the portions can be reliably formed and the insulating legs 2a and 3a are not thin, insulation failure due to the withstand voltage between the stator core 1 and the winding 5 in the slot 6 can be reduced.
[0023]
3 and 5 show the back side of the upper insulating end plate 2 and the lower insulating end plate 3, that is, the mounting surface of the stator core 1 respectively. As shown in the drawing, a concave groove 12 is provided on the mounting surface on the stator core 1 side. Thereby, the resin usage fee of the upper insulating end plate 2 and the lower insulating end plate 3 can be reduced. FIG. 6 is a sectional view taken along line EE ′ of the upper insulating end plate 2 shown in FIGS.
[0024]
From the viewpoint of the resin usage fee, it is desirable that the resin portion on the end face of the stator core 1 of the upper insulating end plate 2 and the lower insulating end plate 3 be as thin as possible, but the depth of the concave groove 12 is It is sufficient that the insulation distance between the end of the stator core 1 and the winding 5 is ensured and that the resin has a resin thickness capable of being filled with resin. good.
[0025]
If the thickness of the insulating leg 2a of the upper insulating end plate 2 and the thickness of the insulating leg 3a of the lower insulating end plate 3 are too large, the effective cross-sectional area in which the winding 5 can be wound into the slot 6 is reduced. Conversely, if it is too thin, resin molding cannot be performed. Accordingly, the effective cross-sectional area for winding the winding 5 into the slot 6 is made as large as possible, and the resin molding can be easily performed, so that the insulation failure due to the withstand voltage between the stator core 1 and the winding 5 does not occur. There must be.
[0026]
By setting the thickness t of the insulating legs 2a and the insulating legs 3a in this case to be 0 <t ≦ 1.0 mm, the effective cross-sectional area in the slot 6 can be made as large as possible, and resin molding can be easily performed. In addition, insulation failure due to withstand voltage can be reduced. In addition, when resin molding is preferably performed, the resin molding speed, the resin running state in the resin mold (particularly, the resin running state in the insulating legs 2a and 3a), the product holding time in the resin mold, and the like, The thickness of the insulating legs 2a and 3a after molding is preferably 0.5 mm so that the dimensional deformation is small.
[0027]
Further, as a material for forming the upper insulating end plate 2 and the lower insulating end plate 3, for example, polyethylene naphthalate (PEN), polyethylene sulfide (PPS), liquid crystal polymer (LCP), fluororesin, polyetheretherketone (PEEK) ), A resin such as polybutylene terephthalate (PBT), and the like. However, the resin molding speed, the resin running state in the resin mold (particularly, the resin running state in the insulating legs 2a and 3a), the resin It is desirable that the insulating legs 2a and 3a have a small dimensional deformation, such as the holding time of the product in the mold and the like. In particular, as the resin in this case, a liquid crystal polymer (LCP) that has a good run-off in the resin mold and has little dimensional deformation is optimal.
[0028]
Further, even if the thickness tolerance varies and the thickness slightly changes as in the present embodiment, it is not necessary to manufacture a resin mold, and insulation failure due to withstand voltage between the stator core 1 and the winding 5 is reduced. By using such a stator for an electric motor, it can be used for a refrigerator or an air conditioner using a compressor as a driving source, and a product excellent in cost and of good quality can be manufactured.
[0029]
Similarly, by using it for a vehicle, a product excellent in cost and having good quality can be obtained. In particular, it is most suitable for a stator of a motor for driving an electric vehicle, a stator of a motor for electric power steering, and the like.
[0030]
【The invention's effect】
The present invention provides a concentrated winding type motor in which the teeth of the stator core are insulated and wound directly with windings, and has insulating legs extending from the upper insulating end plate and the lower insulating end plate into each slot. The insulating legs of the upper insulating end plate are insulated so as to cover the inner surface of the slot of the first stator core, the insulating legs of the lower insulating end plate are insulated so as to cover the inner surface of the slot of the second stator core, In addition, the insulation of the stator core is insulated so as to overlap with the insulating legs of the upper insulating end plate which is insulated so as to cover the inner surface of the slot of the first stator core. Even if the specification changes due to the thickness of the stack, the necessity to make a new resin mold is reduced by changing the degree of overlap between the insulating legs of the upper insulating end plate and the lower insulating end plate. Insulation failure due to withstand voltage with wire It can be reduced.
[0031]
Further, by providing at least one concave groove on the stator core mounting surface side of the upper insulating end plate and the lower insulating end plate, it is possible to reduce the usage fee of an expensive resin material. In this case, the thickness of the stator end portions of the upper insulating end plate and the lower insulating end plate only needs to ensure an insulating distance, and the insulating distance is provided in a concave shape.
[0032]
By setting the thickness t of the insulating legs of the upper insulating end plate and the lower insulating end plate to 0 <t ≦ 1.0 mm, the resin molding can be performed while securing an effective area for winding the coil in the slot as wide as possible. This can be easily performed, and insulation failure due to withstand voltage between the stator core and the winding can be reduced.
[0033]
Preferably, the material of the upper insulating end plate and the lower insulating end plate is LCP (liquid crystal polymer) having good flowability of the resin in the resin mold, so that a product having a stable resin molding dimension can be manufactured.
[0034]
By using a motor using such stator insulation for a stator of a motor mounted in a compressor for a refrigerator or an air conditioner, cost is reduced, and insulation failure due to withstand voltage between the stator and the winding is reduced. be able to. Similarly, the same effect can be obtained even when used for a stator of a motor used for a vehicle.
[Brief description of the drawings]
FIG. 1 is a diagram in which an upper insulating end plate according to an embodiment of the present invention is mounted on a stator core.
FIG. 2 is a sectional view taken along the line DD ′ of the stator tooth portion of the embodiment shown in FIG. 1;
FIG. 3 is a view of the upper insulating end plate shown in FIG. 1 as viewed from below.
FIG. 4 is a diagram in which a lower insulating end plate according to the embodiment of the present invention is mounted on a stator core;
5 is a view of the upper insulating end plate shown in FIG. 4 as viewed from below.
FIG. 6 is an EE ′ cross-sectional view.
FIG. 7 is a diagram showing a conventional example.
FIG. 8 is a diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Stator core, 1a ... 1st stator core, 1b ... 2nd stator core, 2 ... Upper insulating end plate, 2a ... Insulating leg, 3 ... Lower insulating end plate, 3a: insulating leg, 4: tooth portion, 5: winding, 6: slot, 7: bolt hole, 8: neutral point side terminal fixing portion Reference numeral 9 denotes a lead wire side terminal fixing portion, 10 denotes a lead wire fixing hook, 11 denotes a convex and concave portion, 12 denotes a concave groove, and 13 denotes a bolt fixing relief portion.

Claims (6)

In a concentrated winding type motor in which the teeth of the stator core are insulated and the winding is wound directly, the insulation is insulated at both end surfaces of the stator core by an upper insulating end plate and a lower insulating end plate. Are a first stator core larger than the slot shape of the second stator core and a stepped laminated structure of the second stator core, wherein the upper insulating end plate and the lower insulating The end plate has insulating legs extending into each slot, the insulating legs of the upper insulating end plate are insulated so as to cover the slot inner side surface of the first stator core, and the lower insulating end plate is insulated. The leg is insulated so as to cover the inner surface of the slot of the second stator core, and is overlapped with the insulating leg of the upper insulating end plate insulated so as to cover the inner surface of the slot of the first stator core. Motor is characterized by being insulated to Sadako insulation. The stator insulation of an electric motor according to claim 1, wherein the upper insulating end plate and the lower insulating end plate have at least one concave groove on a stator core mounting surface side. 3. The stator insulation of a motor according to claim 1, wherein the thickness t of the insulating legs of the upper insulating end plate and the lower insulating end plate is 0 <t ≦ 1.0 mm. The stator insulation of a motor according to any one of claims 1 to 3, wherein a material of the upper insulating end plate and the lower insulating end plate is LCP (liquid crystal polymer). The stator according to any one of claims 1 to 4, wherein the motor using the stator insulation is used as a motor mounted in a compressor for a refrigerator or an air conditioner. The stator according to any one of claims 1 to 5, wherein the motor using the stator insulation is used for a vehicle.

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