JP5336528B2 - Electric motor stator and compressor and refrigeration cycle apparatus - Google Patents

Description

  The present invention relates to an electric motor stator and compressor and a refrigeration cycle apparatus having an improved shape of an insulating member that reliably insulates between different phases in a multi-phase motor, and insulates between a main winding and an auxiliary winding in a single-phase motor. Is.

  Conventionally, in a stator of an electric motor, each phase is insulated by interposing insulating paper between phases of coil ends formed at both ends in the axial direction.

  For example, a sheet-like interphase insulating paper that insulates different phases of coil ends formed by stator windings inserted into slots of the stator core and projecting outward from both end faces of the stator core, and both In the interphase insulation device for stators made of sheet-like connecting insulating paper that connects the interphase insulating paper at the coil ends, the interphase insulating paper formed by cutting out the insulating sheet material and the connecting insulating paper are welded together. In addition, a stator interphase insulating device is known in which the thickness of the connecting insulating paper is larger than the thickness of the interphase insulating paper (see, for example, Patent Document 1).

  Further, the interphase insulating paper is composed of a coil end interphase portion and a connecting portion for connecting them, and the thickness of one coil end interphase portion is made thicker than the thickness of the other coil end interphase portion. When molding coil ends, there are parts where large stress is applied and parts where only small stress is applied. Therefore, if a thick coil end interphase is placed in the part where large stress is applied, insulation paper breakage is prevented. Moreover, since only one coil end interphase part is made thick, the interphase insulating paper which can prevent the volume of a coil end from becoming large is known (for example, refer patent document 2).

Japanese Utility Model Publication No. 2-129155 Japanese Utility Model Publication No. 5-48555 Japanese Utility Model Publication No. 56-113465 JP 2004-289930 A Japanese Utility Model Publication No. 63-58859

  Conventional interphase insulating paper has a thin band shape because the connecting portion is inserted into the slot, and when forming the coil, the coil end insulating portion is sandwiched between the coils and receives a large external force, so the connecting portion is stretched or cut. Thus, the position of the coil end insulating portion is shifted, and the insulation by the coil end insulating portion of the coil end becomes insufficient. This phenomenon often occurs particularly at the coil rising portion from the stator core. Further, there is a problem that the coil end insulating part leaks due to significant deformation of the coil end and the coil end insulating part is twisted or warped, resulting in a layer short circuit.

  A layer short is a state in which a plurality of coils are stacked and stored between iron cores in an electric motor, so that the coil layers are overlapped. The coil layers need to be insulated. For some reason, the insulation resistance is reduced, which may cause a short circuit. That is, an interlayer short circuit occurs. When an interlayer short circuit occurs, the current does not flow through the normal route, and the performance of the motor is degraded. A layer short is a partial short.

  The present invention was made to solve the above-described problems, and at the time of coil end molding, the base of the connecting portion of the insulating member is cut and the insulating portion of the coil end is prevented from shifting, thereby preventing a layer short circuit. An object of the present invention is to provide an electric motor stator and compressor, and a refrigeration cycle apparatus.

The stator of the electric motor according to the present invention is an electric motor stator having an insulating member that insulates different phases of coil ends formed at both axial ends.
The insulating member includes two insulating portions that insulate between different phases of the coil ends, and a connecting portion that connects these two insulating portions, and a straight line at the base portion excluding an R portion that connects the connecting portion and the insulating portion. At least one of the base part to the insulating part of the connecting part which is a part, the length in the circumferential direction is made longer than the vicinity of the center of the connecting part,
The connecting part is inserted into one slot of the stator, and the dimension of the base part to the insulating part of the connecting part is 70% to 90% of the maximum circumferential dimension of the slot. It is characterized by.

  The stator of the electric motor according to the present invention improves the tensile strength of the connecting portion by the above-described configuration, suppresses the insulating portion from shifting due to the root of the connecting portion being cut during coil end molding, and prevents a layer short circuit. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1, (a) is a top view of the three-phase 4 pole stator which inserted the insulating member, The figure which shows arrangement | positioning of a coil and an insulating member, (b) is sectional drawing of the slot 3. . It is a figure which shows Embodiment 1 and is a top view which shows an insulating member. It is a figure which shows Embodiment 2, and is a top view which shows an insulating member. It is a figure which shows Embodiment 3, and is a top view which shows an insulating member. It is a figure which shows Embodiment 4, and is a top view which shows an insulating member. It is a figure which shows Embodiment 5, and is a top view which shows an insulating member. It is a figure which shows Embodiment 6, and is a conceptual diagram which shows a refrigerating-cycle apparatus.

Embodiment 1 FIG.
1 and 2 show the first embodiment, and FIG. 1 (a) is a plan view of a three-phase four-pole stator with an insulating member inserted therein, showing the arrangement of coils and insulating members, and FIG. ) Is a sectional view of the slot 3, and FIG. 2 is a plan view showing the insulating member.
As shown in FIG. 1, a stator 1 (a stator of an electric motor) includes a stator core 2 configured by laminating electromagnetic steel plates having a thickness of 0.2 to 0.7 mm, and a slot of the stator core 2. 3 is provided with a coil 4 inserted into 3 and an insulating member 6 for insulating between different phases. A connecting portion 7 (shown by a black dot in FIG. 1) of the insulating member 6 is inserted into the slot 3. The entire portion where the coil 4 is formed into a circular arc from one slot 3 to another slot 3 is called a coil end 5.

  The stator shown in FIG. 1 is a three-phase four-pole stator. Since its basic configuration is well known, the details are omitted, but an inner phase coil is inserted inside the slot 3 on the slot opening side. The intermediate phase coil is inserted outside through the two insulating members 6. And an outer phase coil is inserted in the outermost peripheral part of the outer side of a middle phase coil via two insulating members 6.

  Although an example of the insulating member 6 is shown in FIG. 2, the insulating member 6 includes two insulating portions 8 that insulate different phases of the coil end 5 and a connecting portion 7 that connects the two insulating portions 8. The circumferential length (width) W1 of the base portion of the insulating portion 8 and the connecting portion 7 is longer than the circumferential length (width) W2 near the center of the connecting portion 7. As a dimensional guide, the circumferential length (width) W1 of the base portion of the connecting portion 7 is shorter than the circumferential dimension L of the slot 3 (see FIG. 1B), and the circumferential direction near the center of the connecting portion 7 is used. The length (width) W2 is preferably about half the circumferential length (width) W1 of the base portion of the connecting portion 7.

  Here, the dimension of the base part of the connecting part 7 is the dimension of the straight part of the base part excluding the R part (see FIG. 1B) connecting the connecting part 7 and the insulating part 8, and is the maximum of the slot 3. A length of 70% to 90% of the circumferential dimension (the maximum value of L shown in FIG. 1B) is good. The reason why the vicinity of the center is made thinner than the base portion of the connecting portion 7 is to reduce the space factor in the slot 3 and suppress the pressure on the winding when the winding is inserted.

  Therefore, since the width of the connecting portion 7 is wider than the slot opening (the portion opened to the inner diameter side of the stator core 2 of the slot 3), the insulating member 6 is inserted into the slot 3 and then the slot 3 is inserted. No more jumping out.

  Further, the insulating member 6 is symmetrical in order to eliminate an insertion error, and the insulating portion 8 of the coil end 5 on the lead side having a large axial length in both the coil ends 5 is widened in the axial direction. When forming the coil end 5, the insulating member 6 needs to have a sufficient length of the insulating portion 8 so that the interphase coil 4 does not contact even if the insulating member 6 is displaced.

  The insulating member 6 is formed by punching the whole from an insulating thin plate material such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), and aromatic aramid paper. After the insulating portion 8 and the connecting portion 7 of the end 5 are separately formed, they may be bonded or welded. Further, the insulating portion 8 and the connecting portion 7 may be inserted by bonding or welding different materials.

  In order to eliminate an insertion error of the insulating member 6, a small notch may be provided on the lead side or the non-lead side, or a display may be provided.

  In the present embodiment, an example in which two insulating members 6 are used between the respective phases has been described. However, one insulating member 6 or a plurality of three or more members may be used.

  Further, in the present embodiment, an example in which the winding has three phases is shown, but it may be single phase or multiphase.

  As described above, according to the first embodiment, at the time of forming the coil end 5, it is possible to suppress the base portion of the connecting portion 7 from being cut or extended by an external force, eliminating the displacement of the insulating portion 8, Layer short-circuit can be prevented.

Embodiment 2. FIG.
FIG. 3 is a diagram showing the second embodiment and is a plan view showing an insulating member.
As shown in FIG. 3, the insulating member 6 is formed by integrally punching the insulating portion 8 and the connecting portion 7, and bonding or welding the auxiliary member 9 to at least one of the base portions of the insulating portion 8 and the connecting portion 7. The strength of the base portion is improved (FIG. 3 shows the auxiliary member 9 bonded or welded only to one base portion).

  The insulating member 6 is formed by punching the whole from an insulating thin plate material such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), aromatic aramid paper, and the like. The auxiliary member 9 may be bonded or welded to the bonded or welded part after separately forming the insulating part 8 and the connecting part 7 of the coil end 5.

  Further, the insulating portion 8, the connecting portion 7, and the auxiliary member 9 may be made of different materials.

  Further, the insulating member 6 may not be symmetrical.

  The dimension (L2) in the axial direction and the dimension (L1) in the circumferential direction of the insulating portion 8 are preferably matched to the molding dimension of the coil end 5. The coil end 5 having a large outer diameter is relatively short in the axial direction and long in the circumferential direction. Moreover, it is preferable that the coil end having a small outer diameter has a length that is long in the axial direction and short in the circumferential direction.

  In addition, the above example is a case where two insulating members 6 are used, but one insulating member 6 or a plurality of three or more members may be used.

  Moreover, the insulating member 6 of this Embodiment is applicable not only to a single phase motor but to a multiphase motor.

  According to the second embodiment, when the coil end 5 is formed, it is possible to suppress the base portion of the connecting portion 7 from being cut or stretched by an external force, thereby eliminating the displacement of the insulating portion 8 and preventing a layer short circuit.

Embodiment 3 FIG.
FIG. 4 is a plan view showing the insulating member according to the third embodiment.
As shown in FIG. 4, the insulating member 6 is formed by integrally forming one insulating portion 8 and the connecting portion 7, and the other insulating portion 8, which is a separate piece, is provided with a protruding portion 10 protruding toward the connecting portion 7. And the connection part 7 is adhere | attached so that it may overlap with the other insulating part 8 and the convex part 10 of another piece.

  At the time of forming the coil end 5, the convex part 10 is provided on the insulating part 8 with the larger moving amount of the coil 4, the insulating part 8, the convex part 10 and the connecting part 7 are bonded, and the base part of the connecting part 7 is doubled It is characterized by doing. This ensures the strength of the base portion that is most easily cut and stretched by molding.

  The insulating member 6 is made of an insulating thin plate material such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), and aromatic aramid paper.

  Further, in order to eliminate an insertion error of the insulating member 6, a small notch may be provided or displayed on the insulating portion 8 on the lead side or the insulating portion 8 on the opposite lead side to which the lead wire is connected. The lead-side insulating portion 8 and the anti-lead-side insulating portion 8 are usually different in shape, so that an insertion error may occur, but this is to eliminate it.

  Further, the insulating member 6 may not be symmetrical.

  Two insulating members 6 may be used between the different phases of one coil end 5, or one insulating member 6 or a plurality of three or more insulating members 6 may be used.

  According to the above-described third embodiment, when the coil end 5 is formed, the insulating member 6 is prevented from being stretched or cut by an external force, and a layer short circuit is prevented.

Embodiment 4 FIG.
FIG. 5 is a plan view showing an insulating member according to the fourth embodiment.
In the example shown in FIG. 5, two connecting portions 7 that connect the insulating portions 8 of both coil ends 5 are provided close to both ends of the insulating member 6, and one connecting portion 7 is provided therebetween. If the connecting part 7 is only at both ends of the insulating member 6 and there is no connecting part 7 between them, the center of the insulating part 8 is lifted by an external force when the coil end 5 is formed, resulting in insulation leakage. The connecting portion 7 is provided to prevent insulation leakage near the center of the insulating portion 8 in the circumferential direction.

  The number of each of the connecting portions 7 near both ends and the center is not limited to that shown in FIG. 5 and may be any number.

  The insulating member 6 is formed by punching the whole from an insulating thin plate material such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), and aromatic aramid paper. The insulating part 8 and the connecting part 7 of the end 5 may be separately formed and then bonded or welded.

  Further, the insulating portion 8 and the connecting portion 7 may be inserted by bonding or welding different materials.

  Two insulating members 6 may be used between the different phases of one coil end 5, or one insulating member 6 or a plurality of three or more insulating members 6 may be used.

  According to the above-described fourth embodiment, at the time of forming the coil end 5, it is possible to suppress the insulation member 6 from being shifted due to an external force and insufficiently insulating, thereby preventing a layer short circuit.

Embodiment 5 FIG.
FIG. 6 is a plan view showing the insulating member according to the fifth embodiment.
As shown in FIG. 6, the interval between the connecting portions 7 is widened toward the insulating portion 8 on the coil end 5 side having a large forming dimension when forming the coil end 5, and on the coil end 5 side having a large forming dimension. A relief 11 is provided on the outer periphery of the insulating portion 8.

  When the strength of the base portion of the insulating portion 8 and the connecting portion 7 is improved, the tension of the insulating portion 8 is increased after molding. However, by providing the relief 11, the tension of the insulating portion 8 is suppressed, and the insulating portion 8 becomes the coil 4. To fit.

  Further, the relief 11 suppresses the tension of the insulating portion 8 due to the molding of the coil end 5 and suppresses the tearing and elongation of the insulating member 6. The relief 11 is constituted by a gentle curve. The relief 11 may be provided on both coil ends 5 or only on one side.

  The insulating member 6 is formed by punching the whole from an insulating thin plate material such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), and aromatic aramid paper. The portion 8 and the connecting portion 7 may be separately formed and then bonded.

  Further, the insulating portion 8 and the connecting portion 7 may be inserted by bonding or welding different materials.

  Two insulating members 6 may be used between the different phases of one coil end 5, or one insulating member 6 or a plurality of three or more insulating members 6 may be used.

  According to the above-described fifth embodiment, when the coil end 5 is formed, the insulating member 6 is prevented from being displaced due to an external force and insufficient insulation is prevented, and a layer short circuit is prevented.

  Note that a relief 11 may be provided in at least one of the insulating portions 8 of the insulating member 6 in the first to fourth embodiments. The relief 11 suppresses the tension of the insulating portion 8 due to the molding of the coil end 5 and suppresses breakage and elongation of the insulating member 6.

Embodiment 6 FIG.
FIG. 7 shows the sixth embodiment and is a conceptual diagram showing a refrigeration cycle apparatus.
In FIG. 7, the compressor 12 is driven by an electric motor 13 connected to a single-phase or three-phase power supply 14. The electric motor 13 uses the stator 1 using the insulating member 6 described in any of the first to fifth embodiments.

  The compressor 12 includes a commonly used refrigeration cycle (compressor 12 → four-way valve → outdoor heat exchanger or indoor heat exchanger → throttle device → indoor heat exchanger or outdoor heat exchanger → four-way valve → compressor 12). Refrigeration cycle sequentially connected by refrigerant piping), HFC refrigerants represented by R134a, R410a, R407c and the like as refrigerants, and R744 (carbon dioxide), R717 (ammonia), R600a (isobutane), A natural refrigerant typified by R290 (propane) or the like is used. As the refrigeration oil, a weakly compatible oil typified by an alkylbenzene oil or a compatible oil typified by an ester oil is used.

  As the compressor 12, a reciprocating, a rotary, a scroll type or the like can be used. Since the electric motor 13 incorporated in the compressor 12 is shut off from the outside air and filled with the refrigerant, it is necessary to have a refrigerant resistance specification. When the temperature is lowered and the liquid is liquefied, the insulation resistance is particularly lowered, the insulation resistance between the coils 4 is lowered, and a layer short circuit of the electric motor 13 is likely to occur. Therefore, the insulation member 6 according to the first to fourth embodiments. It is effective to use the compressor 12 having a large layer short-circuit resistance for the refrigeration cycle.

  In FIG. 7, the three-phase or single-phase power supply 14 is directly input to the compressor 12, but a driving method using an inverter may be used.

  The motor 13 may be a brushless DC motor, an induction machine, or a synchronous motor. In the compressor 12 that magnetizes the rotor magnet with a stator, a large external force acts on the coil 4 due to magnetization. In order to prevent a layer short, the compressor 12 using the insulating member 6 of the first to fourth embodiments is further effective.

  In the compressor 12 configured as described above, a layer short circuit can be prevented, and quality and safety are improved.

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Stator iron core, 3 slots, 4 coils, 5 coil end, 6 Insulation member, 7 Connection part, 8 Insulation part, 9 Auxiliary member, 10 Convex part, 11 Relief, 12 Compressor, 13 Electric motor, 14 Power supply.

Claims (4)

In a stator of an electric motor having an insulating member that insulates between different phases of coil ends formed at both ends in the axial direction,
The insulating member includes two insulating portions that insulate between different phases of the coil end, and a connecting portion that connects the two insulating portions, and integrally forms the one insulating portion and the connecting portion. Another insulating part, which is a separate piece, has a convex part protruding toward the connecting part, and the connecting part is bonded or welded so as to overlap the other insulating part, which is a separate piece, and the convex part. A stator for an electric motor, wherein the convex portion is provided in an insulating portion having a larger amount of coil movement when the coil end is formed. The stator for an electric motor according to claim 1 , wherein a relief is provided outside at least one of the two insulating portions in the axial direction. A compressor equipped with an electric motor using the stator of the electric motor according to claim 1 or 2 . In the refrigerating cycle apparatus which connected the compressor, the condenser, the expansion apparatus, and the evaporator with refrigerant | coolant piping, the compressor of Claim 3 was used for the said compressor, The refrigerating cycle apparatus characterized by the above-mentioned.

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