JP2010288405A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine having insulating paper which is paper used by a stator extremely narrow in an interval between slots, high in holding performance to a stator core, and favorable in the insertion performance of a coil. <P>SOLUTION: The rotating electric machine comprises: the annular stator core formed with a plurality of the slots in the circumferential direction of the internal peripheral face, and having teeth in the circumferential direction; and the stator coil which is wound via a U-shaped insulating sheet attached to the internal peripheral face of each slot of the plurality of slots. In the attachment state of the insulating sheet, the outermost part of a bent part which is bent within the width of the tooth face is arranged so as to oppose the side bent parts or outside faces of the other adjacent insulating sheets with a dimension width which does not cause the interference mutually. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine including a sheet such as slot insulating paper for ensuring insulation between a stator core and a coil.

  Generally, a stator such as a generator or a motor is composed of an annular stator core having a plurality of slots opened in the circumferential direction of an inner peripheral surface, and coils wound around the slots, and the stator core and the coils are arranged between the stator core and the coils. Insulating paper for ensuring electrical insulation is inserted into the paper.

  The insulating paper is widely used because it has excellent heat resistance and insulation properties, such as Nomex (heat-resistant polyamide paper) and PPS film (polyphenylene sulfide film), and has a certain level of plasticity. In order to improve the mechanical strength, a sheet having a layer structure with a polyethylene terephthalate film (PET film) is also known, and generally a sheet having a thickness of 0.1 to 1 mm or less is used.

  However, since the insulating paper is plastic and has a certain rigidity as described above, the insulating paper is insulated when it is mounted on the stator core before it is inserted or directly wound, when it is transferred to the table or when it is wound. As a result, the paper is dropped or the insulating paper is displaced, and as a result, the coil and the stator core may be in direct contact when the stator coil is inserted.

  As a countermeasure against this, a conventional slot insulating paper has been widely used which has a folding surface (bending portion) protruding from the stator core surface so that the insulating paper does not move in the axial direction of the slot when the coil is inserted. (For example, Patent Document 1)

Japanese Utility Model Publication No. 60-162951 (2nd page, FIG. 3)

  However, in recent years, the number of slots in the stator core tends to increase due to an increase in the number of poles for the purpose of higher output and noise reduction, and the adoption of duplex connection or multiphase. For this reason, the slot spacing of the stator core is narrowed, and in the conventional arrangement of insulating paper, the bent portions of adjacent insulating papers interfere with each other, causing a repulsive force between them and insulating at the slot entrance. The paper falls to the slot side and closes the slot entrance. That is, when the stator coil is inserted or directly wound, the insulating paper is caught, and a gap is formed between the stator core and the insulating paper, and the stator coil enters there and does not serve as the insulating paper. was there.

  An object of the present invention is to provide a rotating electrical machine that reliably maintains the insulation of a stator coil and is excellent in winding workability.

  The rotating electrical machine of the present invention includes an annular stator core having a plurality of slots opened in the circumferential direction of the inner circumferential surface and having teeth in the circumferential direction, and a U-shaped insulating sheet attached to the inner circumferential surface of each slot. The insulating sheet has a bent portion bent on the tooth surface in a state where the insulating sheet is mounted on the inner peripheral surface of the slot, and the bent portion is And it is set as the structure arrange | positioned in the non-contact with the bending part of another adjacent insulating sheet.

  In addition, when the insulating sheet is attached, the side sheet of the other insulating sheet adjacent to the insulating sheet has a width that does not interfere with each other so that the maximum outer portions of the bent portions bent within the width of the tooth surface do not interfere with each other. It is set as the structure arrange | positioned facing a part or an outer surface.

  The present invention provides a rotating electrical machine that reliably maintains the insulation of a stator coil and is excellent in winding workability.

The perspective view of the stator of the alternator for vehicles equipped with the insulating paper of the present invention. The partial front view of the core of FIG. The perspective view of the insulating paper in the 1st example of the present invention. FIG. 4 is a front view of FIG. 3. FIG. 4 is a cross-sectional view of the slot portion showing the insulating paper mounted state of FIG. 3. The perspective view of the insulating paper in the 2nd Example of this invention. The side view of FIG. The perspective view of the insulating paper in the 3rd Example of this invention. The front view of FIG. The cross-sectional view of the slot part which shows the insulating paper mounting state of FIG. The perspective view of the insulation paper in the 4th example of the present invention. The front view of FIG. The cross-sectional view of the slot part which shows the insulating paper mounting state of FIG. The perspective view of the insulating paper in the 5th Example of this invention. The front view of FIG. The cross-sectional view of the slot part which shows the insulating paper mounting state of FIG.

  Each example will be described below with reference to the drawings.

[First embodiment]
An embodiment of the present invention will be described with respect to a stator used in an automotive alternator.

  As shown in FIGS. 1 and 2, the stator core 1 formed in an annular shape is formed with a plurality of slots 1 a having openings 1 b for inserting the stator coil 2 in the circumferential direction of the inner periphery thereof. Is inserted from the opening 1b through the insulating paper (which may be a sheet material such as insulating resin (which may be referred to as insulating sheet), but is also referred to as insulating paper) 3 and then wound on the opening 1b. A slot wedge 4 is attached to form a stator. The stator core 1 includes a back core 1c formed on the outer periphery thereof, and teeth 1d formed on the inner side from the back core 1c and alternately formed in the circumferential direction with the slots 1a. The slot 1a has a tendency to increase the number of slots, for example, 72 due to the demand for higher output in recent years, and is characterized in that the interval between adjacent slots has become very short.

  3 and 4 show the insulating paper 3 loaded in the slot 1a. FIG. 3 shows a specific embodiment.

  The insulating paper 3 is cut into a developed insulating paper material having a convex shape at both ends in the longitudinal direction of the rectangular shape, and the convex portions (finally the side bent portion 3a and the rear bent portion 3c are formed. ) Is integrally bent in the direction of the outer surface 3b of the insulating paper 3 at an angle θ (see FIG. 4), and finally bent into a U-shape that should be adapted to the groove shape of the slot 1a of the stator core 1. Thus, the insulating paper 3 can be inserted into the slot 1a of FIG. In other words, the insulating paper 3 does not have a bent portion for preventing axial movement in the vicinity of the opening end 3d.

  As shown in FIG. 5, the bending angle θ is set so that the opening width L2 of the bent portion is ½ or less of the width L1 of the teeth 1d, and the adjacent insulating paper 3 mounted in the slot 1a The side bent portions 3a have a dimensional relationship that does not interfere with each other.

  According to the present embodiment, when the insulating paper 3 is attached to the stator core 1, the insulating sheet that is the insulating paper has a bent portion (side bent portion 3a) bent on the tooth 1d surface. By arranging the insulating sheet in a non-contact manner with the bent portion, interference between the bent portions is eliminated. Specifically, the insulating sheet has side fold portions 3a of other insulating sheets adjacent to each other with a width that does not interfere with each other at the maximum outer portion of the bent portion that is bent within the width L1 of the tooth 1d surface. It is set as the structure facing the outer side surface 3b. That is, the side bent portion 3a and the rear bent portion 3c are provided around the back core 1c in FIG. 2, and the side bent portion 3a has a gap with the side bent portion 3a of the adjacent insulating sheet. Since they face each other, the axial movement of the insulating paper 3 can be reliably ensured without interfering with each other, and in addition, since the side bent portion 3a does not exist in the vicinity of the opening 1b, Even if the insulating paper 3 is mounted, there is no influence by interference between the bent portions.

  Therefore, there is no worry that the insulating paper 3 is closed and the stator coil 2 cannot be inserted in the vicinity of the opening 1b, and even an unskilled worker can smoothly insert the stator coil 2.

  In this embodiment, in order to disperse the stress concentration at the time of winding and reduce the insulation failure due to the tearing of the insulating paper, the root bend R that bends the convex shape of the insulating paper 3 is R0. 2 or more.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. FIG. 7 is a side view of FIG.

  In order to improve the winding property of the stator coil 2, the side bent portion 3a in the vicinity of the opening end 3d of the insulating paper 3 which is an interference portion of the bent portion of the insulating paper 3 is removed as in the first embodiment. .

  In this embodiment, the bending heights of the side bent portions 3a on both sides are tapered so as to gradually decrease toward the opening end 3d.

  Also in the present embodiment, since the insulating paper 3 is provided with a bent portion that locks the teeth 1d of the stator core 1 in the axial direction, the movement of the insulating paper 3 can be reliably held, and the side bent portion is also provided. Since there is no bent portion around the opening 1b where the 3a interferes, there is an advantage that the rigidity of the outer surface 3b of the insulating paper 3 is enhanced in addition to the first embodiment.

[Third embodiment]
Next, a third embodiment will be described based on FIG. 8, FIG. 9, and FIG.

  8, 9, and 10, one side bent portion 3 a is removed to avoid interference between the side bent portions 3 a of the adjacent insulating paper 3, that is, the side bent portion 3 a of the insulating paper 3 is removed. It is formed along the outer surface only on one adjacent insulating paper 3 side, and the side bent portion 3a is opposed to the outer surface of another adjacent insulating sheet with a gap. Further, as shown in FIG. 10, the opening width L2 is set to be 1/2 or more of the teeth width L1 and smaller than L1 (L1 / 2 ≦ L2 <L1).

  According to such a configuration, the angle θ of the bent portion can be increased as compared with the other embodiments, and there is an advantage that the axial holding of the insulating paper 3 can be further strengthened.

[Fourth embodiment]
Next, a fourth embodiment will be described based on FIG. 11, FIG. 12, and FIG.

  11, 12, and 13 constitute the axial holding by bringing the entire circumference of the rear bent portion 3 c and the side bent portion 3 a of the adjacent insulating paper 3 into close contact with the outer surface of the insulating paper 3. ing. In other words, it is formed by being bent along the outer surface of the insulating sheet and closely contacting.

  About the shape of this bent part, since it is formed by simple bending molding with a press or the like, a certain degree of angle is maintained by returning the bent part by the springback effect due to the rigidity of the material of the insulating paper 3. It becomes a shape. The opening width L2 is made smaller than 1/2 of the teeth width L1.

  Further, the angle θ of the bent portion differs depending on the material of the insulating paper 3. In the stator core 1 according to the present embodiment, paper or a laminate of paper and resin is used, and insulating resin or the like is used only for the resin. However, the angle is formed by different springback effects due to the rigidity of each mechanical property. Yes, depending on the insulating paper 3.

  When the angle θ of the bent portion is 0 °, the insulating paper 3 is fixed by thermoforming by heating or thermocompression bonding during bending. This can also be achieved by forcibly holding the angle of the bent portion at 0 ° by a method such as application of an adhesive or mechanical caulking.

  In the present embodiment, regarding the shape of the bent portion formed by thermoforming or thermocompression bonding, the material of the insulating paper 3 is preferably Nomex (heat-resistant polyamide paper) and polyphenylene sulfide resin (PPS). An insulating sheet with improved mechanical rigidity is also possible due to the laminated structure of polyethylene terephthalate resin (PET resin). In the bonding with an adhesive, the material of the adhesive is preferably a urethane or epoxy adhesive having a relatively high heat resistance.

  Alternatively, the insulating paper 3 without a bent portion can be formed by bonding and bonding only the side bent portion 3a as a separate part with an adhesive or the like.

  Furthermore, the workability is worse compared to the first to third embodiments, but since the angle of the bent portion is close to 0 °, the installation range of the bent portion can be very narrow, and the slot interval is insulated. This is a form of insulating paper that can be reduced to an interval of about 4 to 5 times the paper thickness and is effective for a stator having a very large number of slots.

[Fifth embodiment]
Next, a fifth embodiment will be described based on FIG. 14, FIG. 15, and FIG.

  In this embodiment, as described in the first embodiment, in order to improve the winding property of the stator coil 2 in the interference of the bent portion, the opening end 3d of the insulating paper 3 which is the interference portion of the bent portion of the insulating paper 3 is used. This is to remove the nearby side bent portion 3a, but the same effect can be obtained by changing the shape of the side bent portion 3a.

  That is, as shown in FIGS. 14 and 15, the side bent portion 3 a is bent from a first-stage bending start point to a V-shape at a two-step bending start point so that the central portion is inflated to be bent sideways. This is a form of the insulating paper 3 in which the tip of the portion 3 a is in contact with or close to the outer surface 3 b of the insulating paper 3. That is, the side bent portion of the insulating paper 3 is bent, and the bent portion is formed in a V shape by two-stage bending starting points.

  As a result, the range formed by the side bent portions 3a can be suppressed by a space that is less than half of the conventional space, and the maximum outer portion of the side bent portions 3a of the adjacent insulating paper 3 as shown in FIG. It can be easily eliminated that the opening width L2 interferes with each other's bent portion. Note that L2 is smaller than 1/2 of L1 as in the previous embodiment.

  Although the embodiments of the present invention have been described above, other possible configurations are listed below.

  In each of the above-described examples, the vehicle AC generator has been described as an embodiment of the rotating electrical machine. However, the present invention can also be applied to a motor that outputs rotational force, a motor generator that combines power generation and driving, and the like. . In particular, the motor can be applied as a stator insulating paper to a drive motor for a hybrid vehicle or an electric four-wheel drive vehicle, a motor for driving a pump, or the like.

DESCRIPTION OF SYMBOLS 1 Stator core 1a Slot 1b Opening part 1c Back core 1d Teeth 2 Stator coil 3 Insulating paper 3a Side bent part 3b Outer side surface 3c Back bent part 3d Open end 4 Slot wedge

Claims (8)

An annular stator core that opens a plurality of slots in the circumferential direction of the inner circumferential surface and has teeth in the circumferential direction;
A stator coil wound through a U-shaped insulating sheet attached to the inner peripheral surface of each of the plurality of slots,
The insulating sheet has a bent portion bent on the tooth surface in a state where the insulating sheet is mounted on the inner peripheral surface of the slot, and the bent portion includes a bent portion of another adjacent insulating sheet. A rotating electrical machine characterized by non-contact arrangement. The rotating electrical machine according to claim 1,
The insulating sheet is opposed to a side bent portion or an outer surface of another adjacent insulating sheet with a dimension width in which the maximum outer portion of the bent portion bent within the width L1 of the tooth surface does not interfere with each other. A rotating electrical machine characterized by being arranged. The rotating electrical machine according to claim 1 or 2,
The U-shaped insulating sheet includes a rear bent portion and a side bent portion in the periphery facing the back core, and the side bent portion and the gap of another insulating sheet adjacent to the side bent portion. A rotating electrical machine characterized by facing each other. The rotating electrical machine according to claim 3,
The rotating electric machine is characterized in that the side bent portion has a tapered shape that gradually decreases toward an opening end. The rotating electrical machine according to any one of claims 1 to 4,
The U-shaped insulating sheet forms a side bent portion only along one outer surface, and the side bent portion is opposed to the outer surface of another adjacent insulating sheet with a gap. A rotating electrical machine characterized by The rotating electrical machine according to claim 3,
The rotating electric machine according to claim 1, wherein the side bent portion is bent along the outer side surface of the insulating sheet and is in close contact therewith. The rotating electrical machine according to claim 6,
A rotating electric machine characterized in that a portion corresponding to the side bent portion is a separate member and is joined to the insulating sheet. The rotating electrical machine according to claim 3,
A rotating electric machine characterized in that a side bent portion of the insulating sheet is bent and a bent portion is formed in a V shape by two bending starting points.

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