JP5211713B2 - Stator, motor and compressor - Google Patents

Description

  The present invention relates to a stator, a motor, and a compressor.

  Conventionally, there is a stator including a stator core and an insulator attached to an end face in the axial direction of the stator core (see JP 2003-319593 A).

  The stator core has a cylindrical portion and a plurality of teeth portions that protrude radially inward from the inner peripheral surface of the cylindrical portion and are arranged in the circumferential direction.

The insulator has an annular portion and a plurality of teeth that protrude radially inward from the inner peripheral surface of the annular portion and are arranged in the circumferential direction. The outer peripheral surface of this annular part is circular.
JP 2003-319593 A

  However, in the conventional stator, when an oil return passage is provided on the outer peripheral surface of the cylindrical portion of the stator core, there is a problem that the oil return passage is blocked by the insulator.

  Accordingly, an object of the present invention is to provide a stator that can maintain the rigidity of the insulator while maintaining the oil return passage of the stator core and maintain the coil winding state in a good state, a motor using the stator, and the It is providing the compressor using a motor.

In order to solve the above problems, the stator of the present invention is:
A stator core;
An insulator attached to the axial end surface of the stator core,
The stator core includes a cylindrical portion and a plurality of teeth portions that protrude radially inward from the inner peripheral surface of the cylindrical portion and are arranged in the circumferential direction.
The cylindrical portion has an oil passage groove cut out from the outer peripheral surface at a position on the radially outer side of the teeth portion,
The insulator has an annular portion, and a plurality of teeth that protrude radially inward from the inner peripheral surface of the annular portion and are arranged in the circumferential direction,
In the outer peripheral surface of the annular portion, a cut portion is provided at a position on the radially outer side of the tooth portion so as not to block the oil passage groove of the cylindrical portion ,
The shape of the inner surface of the cut portion is characterized by being along the shape of the inner surface of the oil passage groove as viewed in the axial direction .

  According to the stator of the present invention, the cut portion is provided on the outer peripheral surface of the annular portion of the insulator so as not to block the oil passage groove of the cylindrical portion of the stator core. The passage groove is not blocked by the insulator, and an oil return passage can be secured.

  Moreover, since the radial width of the annular portion can be increased while the oil return passage is secured, the rigidity of the annular portion can be maintained and the rigidity of the insulator can be maintained.

  Moreover, since the rigidity of the insulator can be maintained, the winding state of the coil wound around the stator core and the insulator can be maintained in a good state.

Moreover, the material of the insulator can be reduced by the amount corresponding to the cut portion, and the cost can be reduced. Moreover, the said notch part can be made into the required minimum magnitude | size, and the rigidity of the said insulator can be hold | maintained still more reliably.

Moreover, in the stator of one embodiment, the shape of the inner surface of the oil passage groove is substantially semicircular when viewed from the axial direction.

  Moreover, in the stator according to an embodiment, the insulator has a cylindrical wall portion standing on an end face in the axial direction of the annular portion.

  According to the stator of this embodiment, since the insulator has a cylindrical wall portion standing on the end surface in the axial direction of the annular portion, the coil is wound around the stator core and the insulator by the winding nozzle. At this time, even if the locus of the tip of the winding nozzle is circular, the cylindrical wall portion does not interfere with the running of the winding nozzle.

  Moreover, in the stator of one Embodiment, the part located in the radial direction outer side of the said tooth part in the said wall part is notched more than the width | variety of the said tooth part.

  According to the stator of this embodiment, the portion of the wall portion that is located on the radially outer side of the tooth portion is notched beyond the width of the tooth portion. Interference can be prevented and the oil return passage can be more reliably secured. In addition, the material of the insulator can be reduced only at the notched portion of the wall portion, and the cost can be reduced.

In one embodiment of the stator,
A coil wound around the stator core and the insulator;
At least a part of the wiring is wound inside the wall so that a part of the wiring of the coil does not overlap the oil passage groove when viewed from the axial direction.

  Here, the wiring is, for example, a lead wire or a crossover wire. The lead wire is, for example, a wire that is connected to a substrate and is supplied with current from the outside. The crossover wire is a wire that connects the phases of the coil.

  According to the stator of this embodiment, at least a part of the wiring is wound inside the wall so that the wiring of a part of the coil does not overlap the oil passage groove when viewed from the axial direction. Therefore, interference of the wiring with the oil passage groove can be prevented, and an oil return path can be secured more reliably.

  Moreover, in the stator of one Embodiment, the said wiring currently wound inside the said wall part is hold | suppressed with the neutral wire.

  According to the stator of this embodiment, the wiring that is wound inside the wall portion is held by a neutral wire, so that the wiring can be prevented from entering the oil passage groove and the oil can be returned. The passage can be secured more reliably. Moreover, it can prevent that the said wiring contacts the airtight container arrange | positioned at the outer peripheral side of a rotor or a stator.

The motor of the present invention
A rotor,
The stator is arranged to surround the outer peripheral side of the rotor.

  According to the motor of the present invention, since the stator is provided, an oil return passage is ensured to prevent the oil from running out.

The compressor of the present invention is
A sealed container;
A compression mechanism disposed in the sealed container;
It is provided with the said motor which drives the said compression mechanism part while being arrange | positioned in the said airtight container.

  According to the compressor of the present invention, since the motor is provided, an oil return passage is secured to prevent the oil level from being cut.

  Moreover, in the compressor of one Embodiment, the refrigerant | coolant in the said airtight container is a carbon dioxide.

  According to the compressor of this embodiment, the refrigerant is carbon dioxide, and the pressure in the sealed container is higher than that of R410A, R22, etc., and it is necessary to use high-viscosity oil. When oil with high viscosity is used, it is difficult for the oil to return to the compression mechanism portion, so that the oil passage groove of the stator core needs to be enlarged. Even if the oil passage groove is enlarged, since the cut portion is provided, the oil passage groove is not blocked by the insulator, and an oil return passage can be secured.

  According to the stator of the present invention, the notch portion is provided on the outer peripheral surface of the annular portion of the insulator so as not to block the oil passage groove of the cylindrical portion of the stator core. While ensuring the oil return passage, the rigidity of the insulator can be maintained, and the winding state of the coil can be maintained in a good state.

  According to the motor of the present invention, since the stator is provided, an oil return passage is ensured to prevent the oil from running out.

  According to the compressor of the present invention, since the motor is provided, an oil return passage is secured to prevent the oil level from being cut.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes a sealed container 1, a compression mechanism unit 2 and a motor 3 disposed in the sealed container 1. This compressor is a rotary compressor.

  A suction pipe 11 is connected to the lower side of the sealed container 1, while a discharge pipe 12 is connected to the upper side of the sealed container 1. The refrigerant supplied from the suction pipe 11 is guided to the suction side of the compression mechanism unit 2. This refrigerant is carbon dioxide, but may be R410A, R22, or the like.

  The motor 3 is disposed on the upper side of the compression mechanism unit 2 and drives the compression mechanism unit 2 via a rotating shaft 4. The motor 3 is disposed in a high-pressure region in the sealed container 1 where the high-pressure refrigerant discharged from the compression mechanism unit 2 is filled.

  The compression mechanism 2 includes a cylindrical main body 20 and an upper end 8 and a lower end 9 attached to upper and lower open ends of the main body 20.

  The rotating shaft 4 passes through the upper end 8 and the lower end 9 and is inserted into the main body 20. The rotary shaft 4 is rotatably supported by a bearing 21 provided at the upper end 8 of the compression mechanism 2 and a bearing 22 provided at the lower end 9 of the compression mechanism 2.

  A crankpin 5 is provided on the rotary shaft 4 in the main body 20 and compression is performed by a compression chamber 7 formed between a piston 6 fitted and driven by the crankpin 5 and a corresponding cylinder. . The piston 6 rotates in an eccentric state or revolves to change the volume of the compression chamber 7.

  The motor 3 includes a cylindrical rotor 30 fixed to the rotating shaft 4 and a stator 40 disposed so as to surround the outer peripheral side of the rotor 30. The stator 40 is disposed on the radially outer side of the rotor 30 via an air gap. That is, the motor 3 is an inner rotor type motor.

  The stator 40 is fixed to the sealed container 1 by welding. This welding location is provided at each of three locations in the upper and lower cross sections of the stator 40. The number of welds may be determined by the weight of the motor 3 or the natural frequency, and the method of fixing the stator 40 to the sealed container 1 may be press-fitting or shrink fitting.

  The rotor 30 includes a rotor core 31 and magnets 32 embedded in the rotor core 31 in the axial direction and arranged in the circumferential direction.

  The stator 40 includes a stator core 41, insulators 51 attached to both end surfaces of the stator core 41 in the axial direction, and the stator core 41 and a coil 50 wound around the insulator 51.

  As shown in the plan view of FIG. 2, the stator core 41 has a cylindrical portion 45 and nine teeth portions 46 that protrude radially inward from the inner peripheral surface of the cylindrical portion 45 and are arranged in the circumferential direction. .

  The coil 50 is a concentrated winding that is not wound around the plurality of teeth portions 46 but is wound around the teeth portions 46. In FIG. 2, only a part of the coil 50 is drawn with a virtual line.

  The stator core 41 has nine slot portions 47 that open to the inner peripheral side and are arranged in the circumferential direction. That is, the slot portion 47 is formed between the adjacent tooth portions 46.

  The cylindrical portion 45 has an oil passage groove 42 cut out from the outer peripheral surface at a position radially outside the tooth portion 46. The oil passage groove 42 penetrates both end surfaces of the cylindrical portion 45 in the axial direction. The oil passage groove 42 is formed in a substantially semicircular shape. Nine oil passage grooves 42 are provided corresponding to the respective tooth portions 46. The oil passage groove 42 is used, for example, as a passage through which refrigerant or oil passes or a cooling passage.

  As shown in the plan view of FIG. 3, the insulator 51 includes an annular portion 55, nine tooth portions 56 projecting radially inward from the inner peripheral surface of the annular portion 55 and arranged in the circumferential direction, A cylindrical wall portion 57 erected on the axial end surface of the annular portion 55.

  The insulator 51 is made of a heat-resistant resin material such as liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyimide, or polyester.

  The insulator 51 is sandwiched between the stator core 41 and the coil 50 to insulate the stator core 41 and the coil 50 from each other.

  The annular portion 55 of the insulator 51 faces and contacts the cylindrical portion 45 of the stator core 41, and the plurality of tooth portions 56 of the insulator 51 respectively contact the plurality of teeth portions 46 of the stator core 41. They are facing each other.

  The teeth portion 46 of the stator core 41 and the tooth portion 56 of the insulator 51 have substantially the same shape when viewed from the axial direction of the stator core 41.

  On the outer peripheral surface of the annular portion 55, a cut portion 52 is provided at a position radially outside the tooth portion 56 so as not to block the oil passage groove 42 of the cylindrical portion 45. The cut portion 52 penetrates both end surfaces in the axial direction of the annular portion 55. Nine cut portions 52 are provided corresponding to the respective tooth portions 56.

  The cut portion 52 is formed in a substantially semicircular shape. That is, the shape of the cut portion 52 corresponds to the shape of the oil passage groove 42 when viewed from the axial direction.

  A portion of the wall portion 57 that is located on the radially outer side of the tooth portion 56 is notched beyond the width of the tooth portion 56. That is, the wall portion 57 does not exist outside the tooth portion 56 in the radial direction.

  As shown in the plan view of FIG. 4, at least a part of the wiring 50 a does not overlap the oil passage groove 42 when viewed in the axial direction, so that at least a part of the wiring 50 a is the wall portion 57. Has been beaten inside.

  Here, the wiring 50a is, for example, a lead wire or a crossover wire. The lead wire is, for example, a wiring that is connected to a substrate (not shown) and is supplied with current from the outside. The crossover wire is a wire that connects the phases of the coil. A three-phase current of U phase, V phase, and W phase flows through each of the connecting wires.

  The wiring 50a wound inside the wall portion 57 is pressed from above by a neutral wire 50b. In FIG. 4, the crossover lines collected to the neutral point are omitted. Further, the insulating cap that stores the neutral point is actually fitted and fixed in the gap between the adjacent coils.

  According to the stator having the above configuration, the cut portion 52 is provided on the outer peripheral surface of the annular portion 55 of the insulator 51 so as not to block the oil passage groove 42 of the cylindrical portion 45 of the stator core 41. Therefore, the oil passage groove 42 is not blocked by the insulator 51, and an oil return passage can be secured.

  Moreover, since the radial width of the annular portion 55 can be increased while the oil return passage is secured, the rigidity of the annular portion 55 can be maintained, and the rigidity of the insulator 51 can be maintained.

  In addition, since the rigidity of the insulator 51 can be maintained, the winding state of the stator core 41 and the coil 50 wound around the insulator 51 can be maintained in a good state.

  Further, the material of the insulator 51 can be reduced by the amount of the cut portion 52, and the cost can be reduced.

  In addition, since the shape of the cut portion 52 corresponds to the shape of the oil passage groove 42 as viewed from the axial direction, the cut portion 52 can be made to the minimum size, and the rigidity of the insulator 51 can be increased. It can be held more securely.

  Further, since the insulator 51 has a cylindrical wall portion 57 standing on the end surface in the axial direction of the annular portion 55, when the coil 50 is wound around the stator core 41 and the insulator 51 by the winding nozzle. Even if the locus of the tip of the winding nozzle is circular when viewed from the axial direction, the cylindrical wall portion 57 does not interfere with the running of the winding nozzle.

  Further, the portion of the wall portion 57 that is located on the radially outer side of the tooth portion 56 is notched beyond the width of the tooth portion 56, so that the interference of the wall portion 57 with the oil passage groove 42 is prevented. This can prevent the oil return passage more reliably. In addition, the material of the insulator 51 can be reduced only in the notched portion of the wall portion 57, and the cost can be reduced.

  In addition, at least a part of the wiring 50a is wound inside the wall portion 57 so that the wiring 50a of the part of the coil 50 does not overlap the oil passage groove 42 when viewed from the axial direction. Thus, interference of the wiring 50a with the oil passage groove 42 can be prevented, and an oil return passage can be more reliably ensured.

  Further, since the wiring 50a wound inside the wall portion 57 is held by the neutral wire 50b, the wiring 50a is prevented from entering the oil passage groove 42, and an oil return passage is provided. Can be ensured more reliably. In addition, the wiring 50a can be prevented from coming into contact with the sealed container 1 disposed on the outer peripheral side of the rotor 30 or the stator 40.

  According to the motor configured as described above, since the stator 40 is provided, an oil return path is secured to prevent the oil level from being cut.

  According to the compressor having the above-described configuration, since the motor 3 is provided, an oil return path is secured to prevent the oil level from being cut.

  Moreover, the said refrigerant | coolant is a carbon dioxide, The pressure in the airtight container 1 becomes high compared with R410A, R22, etc., and it is necessary to use highly viscous oil. This oil is, for example, a polyalkylene glycol (such as polyethylene glycol or polypropylene glycol), an ether oil, or a mineral oil. When oil with high viscosity is used, it is difficult for the oil to return to the compression mechanism section 2, so the oil passage groove 42 of the stator core 41 needs to be enlarged. Even if the oil passage groove 42 is enlarged, since the cut portion 52 is provided, the oil passage groove 42 is not blocked by the insulator 51, and an oil return passage can be secured.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, as the compression mechanism unit, a scroll type or a reciprocating type may be used in addition to the rotary type. Moreover, it is good also as what is called distributed winding which wound the coil over several teeth. The number of oil passage grooves and the number of cut portions can be increased or decreased. Further, the shape of the oil passage groove and the cut portion may be a semi-elliptical shape or a polygonal shape in addition to the semi-circular shape. In addition, as an insulator, a protrusion extending toward the stator core may be provided between adjacent tooth portions, and this protrusion is formed corresponding to the outline of the slot portion of the stator core, and is formed in the slot portion. Inserted to electrically insulate the contour surface of the slot portion from the coil.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of a stator core. It is a top view of an insulator. It is a top view of a stator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Motor 4 Rotating shaft 5 Crank pin 6 Piston 7 Compression chamber 8 Upper end part 9 Lower end part 11 Intake pipe 12 Discharge pipe 20 Main body part 21, 22 Bearing 30 Rotor 31 Rotor core 32 Magnet 40 Stator 41 Stator core 42 Oil passage groove 45 Cylindrical portion 46 Teeth portion 47 Slot portion 50 Coil 50a Wiring 50b Neutral wire 51 Insulator 52 Cut portion 55 Annular portion 56 Tooth portion 57 Wall portion

Claims (9)

A stator core (41);
An insulator (51) attached to the axial end surface of the stator core (41),
The stator core (41) includes a cylindrical portion (45) and a plurality of teeth portions (46) that protrude radially inward from the inner peripheral surface of the cylindrical portion (45) and are arranged in the circumferential direction.
The cylindrical portion (45) has an oil passage groove (42) cut out from the outer peripheral surface at a position radially outside the teeth portion (46),
The insulator (51) includes an annular portion (55) and a plurality of tooth portions (56) that protrude radially inward from the inner peripheral surface of the annular portion (55) and are arranged in the circumferential direction.
On the outer peripheral surface of the annular part (55), a cut part (52) is formed at a position radially outside the tooth part (56) so as not to block the oil passage groove (42) of the cylindrical part (45). ) it is provided,
The stator characterized in that the shape of the inner surface of the cut portion (52) is along the shape of the inner surface of the oil passage groove (42) when viewed in the axial direction . The stator according to claim 1,
The stator characterized in that the shape of the inner surface of the oil passage groove (42) is substantially semicircular when viewed from the axial direction. The stator according to claim 1 or 2,
The insulator (51) has a cylindrical wall portion (57) standing on an end face in the axial direction of the annular portion (55). The stator according to claim 3,
The stator is characterized in that a portion of the wall portion (57) located on the outside in the radial direction of the tooth portion (56) is cut out beyond the width of the tooth portion (56). The stator according to claim 3 or 4,
A coil (50) wound around the stator core (41) and the insulator (51);
At least a part of the wiring (50a) is formed on the wall (57) so that a part of the wiring (50a) of the coil (50) does not overlap the oil passage groove (42) when viewed from the axial direction. A stator characterized by being wound inside. The stator according to claim 5, wherein
The stator characterized in that the wiring (50a) wound inside the wall (57) is pressed by a neutral wire (50b). A rotor (30);
A motor comprising: the stator (40) according to any one of claims 1 to 6 disposed so as to surround an outer peripheral side of the rotor (30). A sealed container (1);
A compression mechanism (2) disposed in the sealed container (1);
A compressor comprising the motor (3) according to claim 7, which is disposed in the hermetic container (1) and drives the compression mechanism (2). The compressor according to claim 8, wherein
The compressor characterized in that the refrigerant in the sealed container (1) is carbon dioxide.

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