JP2012196086A - Stator, motor, compressor, and assembly method of the stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator which prevents cracks in an insulator and falling of the insulator to the inner surface side due to stator core deformation caused during shrink fitting.SOLUTION: An inner surface 521a of a protruding part 521 of a coil 520 is exposed, and an inner surface 532a of an extending part 532 of an insulator 530 is exposed. The inner surface 532a of the extending part 532 of the insulator 530 is positioned on the radially outer side relative to an inner surface of a teeth part 512 of a stator core 510. Thus, even though an inner surface of the stator core 510 deforms in a manner that moves to the radially inner side or the axially outer side when the stator core 510 is shrink fitted to a sealed container 1, the structure prevents cracks in the insulator 530 and falling of the insulator 530 to the inner surface side of the stator core 510 because an inner wall part which the protruding part 521 of the coil 520 presses does not exist in the insulator 530.

Description

  The present invention relates to a stator, a motor, a compressor, and a method for assembling the stator.

  Conventionally, there is a stator including a stator core, an insulator, and a coil wound around the stator core and the insulator (see Japanese Patent Application Laid-Open No. 2001-55979: Patent Document 1).

  The insulator includes an annular peripheral wall portion disposed opposite to an axial end surface of the stator core, an extending portion extending radially inward of the stator core from an inner surface of the peripheral wall portion, and a radial direction of the stator core in the extending portion And an inner wall provided on the inner inner surface.

  The coil had a protruding portion located on the outer side in the axial direction of the stator core from the end surface in the axial direction of the stator core. This protrusion was located between the peripheral wall portion and the inner wall portion of the insulator.

  However, in the conventional stator, the inner wall portion of the insulator is located on the radially inner side of the stator core with respect to the projecting portion of the coil. Therefore, when the stator core is shrink-fitted in a sealed container, the stator core When the inner surface of the coil is deformed so as to move radially inward or axially outward, the projecting portion of the coil presses the inner wall, causing the insulator to break or the insulator to fall to the inner surface side of the stator core. This falling of the insulator toward the inner surface side caused the insulator to contact the rotor.

JP 2001-55979 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stator that prevents cracking of the insulator and collapse of the insulator toward the inner surface due to deformation of the stator core during shrink fitting, a motor having the stator, a compressor having the motor, and assembly of the stator. It is to provide a method.

In order to solve the above problems, the stator of the present invention is:
A stator core having a teeth portion;
An insulator disposed opposite to each of both axial end surfaces of the stator core;
A coil wound around the teeth portion of the stator core,
The coil is
Than the teeth portion of the stator core, has a protruding portion located outside the stator core in the axial direction,
The inner surface in the radial direction of the stator core in the protrusion is exposed,
The insulator is
An annular peripheral wall,
An extending portion extending radially inward of the stator core from the inner surface of the peripheral wall portion in a direction overlapping the teeth portion of the stator core,
The radially inner inner surface of the stator core in the extending portion is exposed and located on the radially outer side of the stator core with respect to the radially inner inner surface of the teeth portion of the stator core. .

  According to the stator of the present invention, the inner surface of the projecting portion of the coil is exposed, and the inner surface of the extending portion of the insulator is exposed. There is no inner wall portion located on the radially inner side.

  Therefore, when the stator core is shrink-fitted in a closed container, even if the inner surface of the stator core is deformed so as to move inward in the radial direction or outward in the axial direction, the insulator has an inner wall portion pressed by the protruding portion of the coil. Therefore, the crack of the insulator is prevented and the insulator is prevented from falling to the inner surface side of the stator core.

  Further, since the inner surface of the extending portion of the insulator is located radially outside the inner surface of the teeth portion of the stator core, even if the stator core is deformed at the time of shrink fitting, the extending portion of the insulator remains in the stator core. The inner surface of the teeth portion does not protrude inward in the radial direction of the stator core.

  In the stator according to an embodiment, the inner surface of the extending portion of the insulator is positioned on the radially outer side of the stator core with respect to the outer surface of the stator core on the radially outer side in the protruding portion of the coil.

  According to the stator of this embodiment, the inner surface of the extending portion of the insulator is located on the radially outer side of the stator core with respect to the outer surface of the stator core on the radially outer side in the protruding portion of the coil. The extending part does not exist between the protruding part of the coil and the tooth part of the stator core.

  Therefore, even if the stator core is deformed at the time of shrink-fitting, there is no extended portion pressed by the coil, so that the insulator is more reliably prevented from cracking.

  Moreover, in the stator of one embodiment, the space between the protruding portion of the coil and the teeth portion of the stator core is larger toward the radially inner side of the stator core.

  According to the stator of this embodiment, the space between the protruding portion of the coil and the teeth portion of the stator core is larger toward the radially inner side of the stator core. A member (for example, a tooth portion of an insulator) that becomes thicker can be interposed.

  Therefore, in assembling the stator, when an insulator having a tapered tooth portion is assembled to the stator core and the coil is wound around both the stator core tooth portion and the insulator tooth portion, the insulator teeth portion is tapered and strong. Insulator teeth are not damaged. In addition, when the coil is wound around the teeth of the stator core and the teeth of the insulator and then the teeth of the insulator are pulled out radially inward, the teeth of the insulator are tapered, so that the teeth of the insulator can be easily removed from the coil. Can be extracted.

  In the stator of one embodiment, the size of the stator core in the axial direction on the outer surface side of the protruding portion of the coil in the space between the protruding portion of the coil and the tooth portion of the stator core is: It is the same as the thickness of the extension part of the insulator.

  According to the stator of this embodiment, the axial size of the stator core on the outer surface side of the protrusion of the coil in the space between the protrusion of the coil and the teeth of the stator core is: Since the thickness of the extending portion of the insulator is the same as that of the insulator, a tooth portion of the insulator including the extending portion can be interposed in a space between the protruding portion of the coil and the tooth portion of the stator core.

  Therefore, in the assembly of the stator, after the insulator having the teeth portion is assembled to the stator core and the coil is wound around the teeth portion of the stator core and the teeth portion of the insulator, the portion excluding the extending portion in the teeth portion of the insulator is removed from the stator core. The stator can be assembled by extracting it radially inward.

  Further, in the stator according to an embodiment, the inner surface of the extending portion of the insulator includes a radially inner inner surface of the stator core in the projecting portion of the coil and a radial direction of the stator core in the projecting portion of the coil. Located between the outer surface and the outside.

  According to the stator of this embodiment, the inner surface of the extending portion of the insulator is located between the inner surface of the protruding portion of the coil and the outer surface of the protruding portion of the coil. The existing part exists between the protruding part of the coil and the tooth part of the stator core.

  Therefore, the extending portion is fixed between the stator core and the coil by winding the coil, and prevents the insulator from falling off the stator core.

  Moreover, in the stator of one Embodiment, the said inner surface of the said extension part of the said insulator is a torn surface.

  According to the stator of this embodiment, the inner surface of the extending portion of the insulator has a fractured surface. Therefore, in assembling the stator, an insulator having a tooth portion including the extending portion is assembled to the stator core. After the coil is wound around the teeth portion of the stator core and the teeth portion of the insulator, the portion excluding the extending portion in the teeth portion of the insulator can be extracted radially inward of the stator core to assemble the stator.

In the motor of the present invention,
A rotor,
The stator is disposed so as to surround the outer peripheral side of the rotor.

  According to the motor of the present invention, since it has a stator that does not break the insulator and does not fall to the inner surface side, a high-quality motor can be realized.

In the compressor of the present invention,
A sealed container;
A compression element disposed in the sealed container;
The motor disposed in the sealed container and driving the compression element via a shaft.

  According to the compressor of this invention, since it has the stator which does not have a crack of an insulator and a fall to the inner surface side, a high quality compressor can be realized.

Further, the stator assembly method of the present invention includes:
Assembling an insulator having an annular peripheral wall portion and a tooth portion extending radially inward from the inner surface of the peripheral wall portion to an end surface in the axial direction of the stator core having the tooth portion;
Winding the coil around the teeth portion of the stator core and the teeth portion of the insulator;
And a step of removing at least a part including an inner wall part of the teeth part of the insulator from other parts than the part of the insulator.

  According to the stator assembling method of the present invention, when the coil is wound around the stator core, since the tooth portion of the insulator exists, the coil can be reliably wound without being brought into contact with the axial end surface of the stator core. .

  Further, after winding the coil around the stator core, in order to remove at least a part including the inner wall portion of the teeth portion of the insulator, the insulator after the stator assembly has an inner wall portion positioned on the radially inner side of the protruding portion of the coil. ,not exist.

  Therefore, when the stator core is shrink-fitted in a sealed container, even if the inner surface of the stator core is deformed so as to move radially inward or axially outward, the insulator does not have an inner wall portion pressed by the coil. The insulator is prevented from cracking and the insulator is prevented from falling to the inner surface side of the stator core.

In the stator assembly method of one embodiment,
The step of removing at least a part of the teeth portion of the insulator includes:
In the insulator in which the peripheral wall portion and the tooth portion are continuously connected integrally, by pulling at least a portion of the tooth portion inward in the radial direction of the stator core, at least a portion of the tooth portion is broken, At least a part of the tooth portion is removed from the other portion of the insulator.

  According to the stator assembling method of this embodiment, since at least a part of the tooth portion can be removed by pulling inward in the radial direction of the stator core, at least the tooth portion can be used without using a special jig. Some can be easily removed.

In the stator assembly method of one embodiment,
The step of removing at least a part of the teeth portion of the insulator includes:
In the insulator in which the peripheral wall portion and the tooth portion are mechanically connected via a joint portion, the joint portion is cracked by pulling the teeth portion inward in the radial direction of the stator core, and the tooth portion is separated from the peripheral wall. Including removing from the part.

  According to the stator assembling method of this embodiment, since the tooth portion can be removed by pulling inward in the radial direction of the stator core, the tooth portion can be easily removed without using a special jig. it can.

In the stator assembly method of one embodiment,
The step of removing at least a part of the teeth portion of the insulator includes:
In the insulator in which the peripheral wall portion and the tooth portion are mechanically connected via the locking portion of the tooth portion, the locking portion of the tooth portion is removed, and then the teeth portion is moved in the radial direction of the stator core. It includes removing the teeth part from the peripheral wall part by pulling inward.

  According to the stator assembling method of this embodiment, since the tooth portion can be removed by pulling inward in the radial direction of the stator core, the tooth portion can be easily removed without using a special jig. it can.

  According to the stator of the present invention, the inner surface of the protruding portion of the coil is exposed, the inner surface of the extending portion of the insulator is exposed, and the inner surface in the radial direction of the teeth portion of the stator core. Since the stator core is positioned more radially outward than the stator core, it is possible to prevent the insulator from cracking and falling down to the inner surface side of the insulator due to the stator core deformation during shrink fitting.

  According to the motor of the present invention, since it has a stator that does not break the insulator and does not fall to the inner surface side, a high-quality motor can be realized.

  According to the compressor of this invention, since it has the stator which does not have a crack of an insulator and a fall to the inner surface side, a high quality compressor can be realized.

  According to the stator assembling method of the present invention, after winding the coil around the stator core, to remove at least a part including the inner wall portion of the teeth portion of the insulator, the crack of the insulator and the insulator due to the deformation of the stator core at the time of shrink fitting Prevents falling to the inner side of the.

It is sectional drawing which shows 1st Embodiment of the compressor containing the stator of this invention. It is a top view of the principal part of a compressor. It is sectional drawing of the motor vicinity of a compressor. It is sectional drawing to which the principal part of the compressor was expanded. It is sectional drawing which shows the 1st process of the assembly method of a stator. It is sectional drawing which shows the 2nd process of the assembly method of a stator. It is sectional drawing which shows the 3rd process of the assembly method of a stator. It is a side view which shows another insulator. It is a top view which shows another insulator. It is a side view which shows another insulator. It is a top view which shows another insulator. It is a side view which shows another insulator. It is a top view which shows another insulator. It is a top view of the jig | tool used for an assembly of a stator. It is sectional drawing which shows 2nd Embodiment of the stator of this invention. It is sectional drawing which shows 3rd Embodiment of the stator of this invention.

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

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a first embodiment of a compressor according to the present invention. The compressor includes a sealed container 1, a compression element 2 disposed in the sealed container 1, and a motor 3 disposed in the sealed container 1 and driving the compression element 2 via a shaft 12. ing.

  This compressor is a so-called vertical high-pressure dome type rotary compressor, in which the compression element 2 is placed down and the motor 3 is placed up in the sealed container 1. The rotor 6 of the motor 3 drives the compression element 2 via the shaft 12.

  The compression element 2 sucks refrigerant gas from the accumulator 10 through the suction pipe 11. The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor. This refrigerant is, for example, carbon dioxide, HFC such as HC or R410A, or HCFC such as R22.

  The compressor discharges the compressed high-temperature and high-pressure refrigerant gas from the compression element 2 to fill the inside of the hermetic container 1, and passes the gap between the stator 5 and the rotor 6 of the motor 3 through the motor. 3 is cooled, and then discharged from the discharge pipe 13 provided on the upper side of the motor 3 to the outside.

  An oil reservoir 9 in which lubricating oil is stored is formed in the lower portion of the high-pressure region in the closed container 1. This lubricating oil moves from the oil reservoir portion 9 through an oil passage (not shown) provided in the shaft 12 to a sliding portion such as the bearing of the compression element 2 or the motor 3. Lubricate the sliding part. This lubricating oil is, for example, a polyalkylene glycol oil (such as polyethylene glycol or polypropylene glycol), an ether oil, an ester oil, or a mineral oil.

  The compression element 2 includes a cylinder 21 that is attached to the inner surface of the sealed container 1, and an upper end plate member 50 and a lower end plate member 60 that are attached to upper and lower open ends of the cylinder 21. Prepare. A cylinder chamber 22 is formed by the cylinder 21, the upper end plate member 50, and the lower end plate member 60.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The main body 51 and the boss 52 are inserted through the shaft 12.

  The main body 51 is provided with a discharge port 51 a communicating with the cylinder chamber 22. A discharge valve 31 is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the cylinder 21. The discharge valve 31 is, for example, a reed valve, and opens and closes the discharge port 51a.

  A cup-type muffler cover 40 is attached to the main body 51 so as to cover the discharge valve 31 on the side opposite to the cylinder 21. The muffler cover 40 is fixed to the main body 51 by a fixing member 35 (such as a bolt). The muffler cover 40 is inserted through the boss portion 52.

  A muffler chamber 42 is formed by the muffler cover 40 and the upper end plate member 50. The muffler chamber 42 and the cylinder chamber 22 communicate with each other via the discharge port 51a.

  The muffler cover 40 has a hole 43. The hole 43 communicates the muffler chamber 42 with the outside of the muffler cover 40.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The main body 61 and the boss 62 are inserted through the shaft 12.

  In short, one end of the shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. That is, the shaft 12 is cantilevered. One end portion (support end side) of the shaft 12 enters the cylinder chamber 22.

  An eccentric pin 26 is provided on the support end side of the shaft 12 so as to be positioned in the cylinder chamber 22 on the compression element 2 side. The eccentric pin 26 is fitted to the roller 27. The roller 27 is disposed so as to be able to revolve in the cylinder chamber 22, and performs a compression action by the revolving motion of the roller 27.

  In other words, one end of the shaft 12 is supported by the housing 7 of the compression element 2 on both sides of the eccentric pin 26. The housing 7 includes the upper end plate member 50 and the lower end plate member 60.

  Next, the compression action of the cylinder chamber 22 will be described.

  As shown in FIG. 2, the cylinder chamber 22 is partitioned by a blade 28 provided integrally with the roller 27. That is, the chamber on the right side of the blade 28 has the suction pipe 11 opened on the inner surface of the cylinder chamber 22 to form a suction chamber (low pressure chamber) 22a. On the other hand, in the chamber on the left side of the blade 28, the discharge port 51a (shown in FIG. 1) opens on the inner surface of the cylinder chamber 22 to form a discharge chamber (high pressure chamber) 22b.

  Semi-cylindrical bushes 25, 25 are in close contact with both surfaces of the blade 28 for sealing. The blade 28 and the bushes 25, 25 are lubricated with the lubricating oil.

  Then, the eccentric pin 26 rotates eccentrically with the shaft 12, and the roller 27 fitted to the eccentric pin 26 contacts the outer peripheral surface of the roller 27 with the inner peripheral surface of the cylinder chamber 22, Revolve.

  As the roller 27 revolves in the cylinder chamber 22, the blade 28 advances and retreats with both side surfaces of the blade 28 being held by the bushes 25, 25. Then, a low-pressure refrigerant gas is sucked into the suction chamber 22a from the suction pipe 11, compressed in the discharge chamber 22b to a high pressure, and then a high-pressure refrigerant gas is supplied from the discharge port 51a (shown in FIG. 1). Discharge.

  Thereafter, as shown in FIG. 1, the refrigerant gas discharged from the discharge port 51 a is discharged to the outside of the muffler cover 40 via the muffler chamber 42.

  As shown in FIGS. 1 and 3, the motor 3 includes the rotor 6 and the stator 5 arranged so as to surround the outer peripheral side of the rotor 6.

  The rotor 6 includes a rotor body 610 and a magnet 620 embedded in the rotor body 610. The rotor body 610 has a cylindrical shape, and is made of, for example, laminated electromagnetic steel plates. The shaft 12 is attached to the central hole of the rotor body 610. The magnet 620 is a flat permanent magnet. The six magnets 620 are arranged at center angles at equal intervals in the circumferential direction of the rotor body 610.

  The stator 5 includes a stator core 510, an insulator 530 disposed to face both end surfaces of the stator core 510 in the axial direction, and a coil 520 wound around the stator core 510. In FIG. 3, the coil 520 and the insulator 530 are partially omitted.

  The stator core 510 is composed of a plurality of stacked steel plates, and is fitted into the sealed container 1 by shrink fitting or the like. The stator core 510 includes an annular portion 511 and a plurality (9) of teeth portions 512 that protrude radially inward from the inner peripheral surface of the annular portion 511. The plurality of tooth portions 512 are arranged at equal intervals in the circumferential direction.

  The coil 520 is a so-called concentrated winding that is wound around each of the tooth portions 512 and is not wound around the plurality of tooth portions 512. The motor 3 has a so-called 6 pole 9 slot. The rotor 6 is rotated together with the shaft 12 by an electromagnetic force generated in the stator 5 by passing a current through the coil 520.

  The insulator 530 is made of a heat-resistant resin material such as liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyimide, or polyester. Further, the insulator 530 is made of a material containing glass fiber, for example, for improving the strength.

  As shown in FIGS. 3 and 4, the insulator 530 includes an annular peripheral wall portion 531, and a plurality (nine) extending portions 532 extending from the inner surface 531 a of the peripheral wall portion 531 to the radially inner side of the stator core 510. Have.

  The peripheral wall portion 531 faces and contacts the annular portion 511 of the stator core 510. The extension portion 532 extends in a direction overlapping the teeth portion 512 of the stator core 510. The plurality of extending portions 532 are arranged at equal intervals in the circumferential direction corresponding to each tooth portion 512.

  The coil 520 has a protruding portion 521, and the protruding portion 521 is located on the outer side of the stator core 510 in the axial direction than the teeth portion 512 of the stator core 510. An inner surface 521a on the radially inner side of the stator core 510 in the protruding portion 521 is exposed.

  There is a space between the axial end surface of the tooth portion 512 and the protruding portion 521, and the insulation between the coil 520 and the tooth portion 512 can be maintained by this space. In addition, an insulating film is provided between the radial side surface of the tooth portion 512 and the coil 520, and the insulating property between the coil 520 and the tooth portion 512 can be maintained by this insulating film.

  An inner surface 532a on the radially inner side of the stator core 510 in the extending portion 532 is exposed. The inner surface 532a of the extending portion 532 is located on the radially outer side of the stator core 510 with respect to the inner surface 512a on the radially inner side of the tooth portion 512. The inner surface 532a of the extending portion 532 is located on the radially outer side of the stator core 510 relative to the outer surface 521b on the radially outer side of the stator core 510 in the protruding portion 521 of the coil 520.

  The axial size of the stator core 510 on the outer surface 521b side of the protruding portion 521 in the space between the protruding portion 521 and the tooth portion 512 is the same as the thickness of the extending portion 532. The inner surface 532a of the extending part 532 is a fracture surface.

  A part 522 of the coil 520 is wound around the peripheral wall portion 531. This part 522 is a lead wire of the coil 520, and is connected to a terminal (not shown) and supplied with current.

  According to the stator 5 configured as described above, the inner surface 521a of the protruding portion 521 of the coil 520 is exposed, and the inner surface 532a of the extending portion 532 of the insulator 530 is exposed. There is no inner wall portion located on the radially inner side of the stator core 510 with respect to the protruding portion 521 of the coil 520.

  Therefore, when the stator core 510 is shrink-fitted into the sealed container 1, even if the inner surface of the stator core 510 is deformed so as to move radially inward or axially outward, the insulator 530 has a protruding portion 521 of the coil 520. Since there is no inner wall to be pressed, the insulator 530 is prevented from cracking and the insulator 530 is prevented from falling to the inner surface side of the stator core 510.

  In addition, the inner surface 532a of the extending portion 532 of the insulator 530 is located radially outward from the inner surface of the teeth portion 512 of the stator core 510. Therefore, even if the stator core 510 is deformed at the time of shrink fitting, the insulator 530 is deformed. The extending portion 532 does not protrude radially inward of the stator core 510 from the inner surface of the tooth portion 512 of the stator core 510.

  In addition, the inner surface 532a of the extending portion 532 of the insulator 530 is positioned on the outer side in the radial direction of the stator core 510 relative to the outer surface 521b on the outer side in the radial direction of the stator core 510 in the protruding portion 521 of the coil 520. The extending portion 532 does not exist between the protruding portion 521 of the coil 520 and the tooth portion 512 of the stator core 510.

  Therefore, even if the stator core 510 is deformed at the time of shrink fitting, the insulator 530 does not have the extended portion 532 pressed by the coil 520 at all, so that the insulator 530 is more reliably prevented from cracking.

  In addition, the axial size of the stator core 510 on the outer surface 521b side of the protrusion 521 of the coil 520 in the space between the protrusion 521 of the coil 520 and the teeth 512 of the stator core 510 is Since the thickness of the extending portion 532 of the insulator 530 is the same as that of the insulator 530, the insulator 530 that includes the extending portion 532 as a part of the space between the protruding portion 521 of the coil 520 and the tooth portion 512 of the stator core 510 is provided. The teeth portion 533 can be interposed.

  Therefore, in assembling the stator 5, the insulator 530 having the teeth portion 533 is assembled to the stator core 510, and the coil 520 is wound around the teeth portion 512 of the stator core 510 and the teeth portion 533 of the insulator 530, and then the teeth portion 533 of the insulator 530. The portion other than the extending portion 532 in FIG. 5 can be extracted radially inward of the stator core 510 to assemble the stator 5.

  In addition, since the inner surface 532a of the extending portion 532 of the insulator 530 has a fractured surface, an insulator 530 having a tooth portion 533 including the extending portion 532 in the stator core 510 when the stator 5 is assembled. After assembling and winding the coil 520 around the teeth portion 512 of the stator core 510 and the teeth portion 533 of the insulator 530, a portion excluding the extending portion 532 in the teeth portion 533 of the insulator 530 is pulled out radially inward of the stator core 510, The stator 5 can be assembled.

  Further, the radially inner side of the stator core 510 of the protruding portion 521 of the coil 520 is exposed. Furthermore, since the lead wire 522 of the coil 520 is disposed on the peripheral wall portion 531 of the insulator 530, the lead wire drawn around the coil 520 is reduced, and the upper portion of the coil protrusion 521 is exposed. Furthermore, there is a space between the coil protrusion 521 and the stator core 510, and the lower part of the coil protrusion 521 is exposed. Thus, since the coil protrusion 521 is exposed more, the coil 520 is easily cooled by the refrigerant or the lubricating oil.

  Further, as described above, the exposure of the coil protrusion 521 is increased, so that it is difficult for the varnish to be accumulated around the coil protrusion 521 and the amount of varnish applied can be reduced. On the other hand, in the past, extra varnish tends to accumulate between the insulator and the coil at the time of varnish, and there is a problem that the amount of varnish adhesion increases.

  Further, since the inner wall portion 534 of the insulator 530 provided on the inner surface 512a on the radially inner side of the stator core 510 is eliminated, the coil 520 having a larger volume of the inner wall portion 534 can be wound and the efficiency is improved as compared with the conventional case. To do.

  Further, since the inner wall portion 534 of the insulator 530 is eliminated, the insulator 530 is not subjected to stress from the coil protruding portion 521, and the insulator 530 has mechanical characteristics (tensile strength, elongation, etc.) as compared with conventional low grade materials and recycled materials. ) Can be used, and the cost can be reduced. On the other hand, conventionally, a resin material having high mechanical properties has been required as an insulator material corresponding to the stress applied from the coil protruding portion to the inner wall portion.

  According to the motor 3 having the above-described configuration, the motor 3 having high quality can be realized because the stator 5 does not break the insulator 530 and does not fall to the inner surface side.

  According to the compressor having the above-described configuration, the compressor 5 having a high quality can be realized because the stator 5 does not break the insulator 530 and does not fall to the inner surface side.

  The inner surface 532a of the extending portion 532 of the insulator 530 may be flush with the inner surface 531a of the peripheral wall portion 531 of the insulator 530.

  Next, a method for assembling the stator 5 having the above configuration will be described.

  As shown in FIG. 5A, the insulator 530 with the teeth portion 533 is assembled to the end surface of the stator core 510 in the axial direction. The insulator 530 includes an annular peripheral wall portion 531 and a teeth portion 533 extending radially inward from the inner surface 531a of the peripheral wall portion 531. The teeth portion 533 of the insulator 530 has substantially the same shape as the teeth portion 512 of the stator core 510 when viewed from the axial direction of the stator core 510.

  Thereafter, as shown in FIG. 5B, the coil 520 is wound around the teeth portion 512 of the stator core 510 and the teeth portion 533 of the insulator 530 together. As described above, when the coil 520 is wound around the stator core 510, the teeth 533 of the insulator 530 exist, so that the coil 520 can be reliably wound without being brought into contact with the axial end surface of the stator core 510.

  Thereafter, as shown in FIG. 5C, at least a part including the inner wall part 534 in the tooth part 533 of the insulator 530 is removed from other parts of the insulator 530 other than this part. That is, in the insulator 530 in which the peripheral wall portion 531 and the tooth portion 533 are continuously connected integrally, at least a part of the tooth portion 533 is pulled inward in the radial direction (arrow direction) of the stator core 510, thereby At least a portion is broken and at least a portion of the tooth portion 533 is removed from the other portion of the insulator 530. The other part of the insulator 530 includes an extending part 532.

  According to the method for assembling the stator 5 having the above configuration, after the coil 520 is wound around the stator core 510, at least a part including the inner wall portion 534 in the tooth portion 533 of the insulator 530 is removed. The stator 5 without falling down can be assembled. Further, since at least a part of the tooth part 533 can be removed by pulling inward in the radial direction of the stator core 510, at least a part of the tooth part 533 can be easily removed without using a special jig. Can do.

  Next, another embodiment of the stator assembling method will be described.

  As shown in FIGS. 6A and 6B, in another insulator 530A, a notch K is provided in advance between the extending portion 532A fixed to the peripheral wall portion 531A and a part of the teeth portion 533A. And after winding a coil around the teeth part 533A, the extending part 532A and a part of the teeth part 533A can be easily separated by the notch K by pulling a part of the teeth part 533A radially inward. .

  As shown in FIGS. 7A and 7B, in another insulator 530B, the peripheral wall portion 531B and the tooth portion 533B are mechanically connected via a coupling portion 535B. The coupling portion 535B is fixed to the peripheral wall portion 531B and is fitted in the concave groove of the teeth portion 533B. Then, after the coil is wound around the tooth portion 533B, the tooth portion 533B is pulled inward in the radial direction, whereby the coupling portion 535B is broken and the tooth portion 533B is removed from the peripheral wall portion 531B. A part of the coupling portion 535B remaining on the peripheral wall portion 531B side constitutes an extending portion. Therefore, the teeth portion 533B can be easily removed without using a special jig.

  As shown in FIGS. 8A and 8B, in still another insulator 530C, the peripheral wall portion 531C and the tooth portion 533C are mechanically connected via a locking portion 535C of the tooth portion 533C. The locking portion 535C is formed in a protruding shape on the outer side in the radial direction of the teeth portion 533C, and the locking portion 535C forms a concave groove, and the peripheral wall portion 531C is fitted into the concave groove. Then, after the coil is wound around the tooth portion 533C, the locking portion 535C is cut along the cut line L to remove the locking portion 535C, and then the teeth portion 533C is pulled inward in the radial direction. Remove from the peripheral wall 531C. Therefore, the tooth portion 533C can be easily removed without using a special jig.

  In the stator assembly method, after the coil is wound around the teeth portion of the insulator, the work of pulling the teeth portion of the insulator radially inward is a manual operation using no jig, a manual operation using a jig, It is done by a machine.

  Here, as the jig, for example, as shown in FIG. 9, there is a jig in which the same number of pistons 101 as the teeth portion of the insulator are arranged around the cylindrical portion 100. And after hooking the rod of piston 101 on the teeth part of an insulator, the teeth part is pulled in the diameter direction inner side by contracting the rod.

  A pseudo member having the same shape as the teeth portion may be used as the teeth portion of the insulator. When the coil is wound around an insulator that does not include the teeth portion, the pseudo member is brought close to the insulator and the coil is After the winding, the pseudo member may be separated from the insulator. When the jig shown in FIG. 9 is used, the pseudo member is detachable from the rod of the piston 101.

(Second Embodiment)
FIG. 10 shows a second embodiment of the stator of the present invention. The difference from the first embodiment will be described. In the second embodiment, the configuration of the coil is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 10, the space between the projecting portion 521 </ b> A of the coil 520 </ b> A and the tooth portion 512 of the stator core 510 is larger toward the radially inner side of the stator core 510. This space is continuously increased radially inward of the stator core 510. However, this space may be increased stepwise inward of the stator core 510 in the radial direction.

  Thus, since the space becomes larger toward the radially inner side of the stator core 510, a member (for example, a tooth portion 535D of the insulator 530) that becomes thicker toward the radially inner side can be interposed in the space.

  Therefore, in assembling the stator, when the insulator 530 having the tapered teeth portion 533D is assembled to the stator core 510 and the coil 520A is wound around the teeth portion 512 of the stator core 510 and the teeth portion 533D of the insulator 530, the teeth of the insulator 530 are wound. Since the portion 533D is thick and strong, the teeth portion 533D of the insulator 530 is not damaged. In addition, when the coil 520A is wound around the teeth portion 512 of the stator core 510 and the teeth portion 533D of the insulator 530 and then the teeth portion 533D of the insulator 530 is extracted radially inward, the teeth portion 533D of the insulator 530 is tapered. The teeth portion 533D of the insulator 530 can be easily extracted from the coil 520A.

(Third embodiment)
FIG. 11 shows a third embodiment of the stator of the present invention. The difference from the first embodiment will be described. In the third embodiment, the configuration of the insulator is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 11, the inner surface 532a of the extending portion 532E of the insulator 530E has an inner surface 521a on the radially inner side of the stator core 510 in the protruding portion 521 of the coil 520 and an outer surface in the radial direction of the stator core 510 on the protruding portion 521 of the coil 520. It is located between the outer surface 521b.

  Therefore, the extending portion 532E exists between the protruding portion 521 of the coil 520 and the tooth portion 512 of the stator core 510. The extending portion 532E is fixed between the stator core 510 and the coil 520 by winding the coil 520, and prevents the insulator 530E from falling off the stator core 510.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the feature points of the first to third embodiments may be variously combined. Further, the inner surface of the extending portion of the insulator may be positioned between the radially inner surface of the stator core in the protruding portion of the coil and the radially inner surface of the teeth portion of the stator core. Moreover, the increase / decrease in the quantity of the extension part of an insulator and the teeth part of a stator core is free. In addition to the concentrated winding, the coil may be distributed winding. In addition to the rotary type, a scroll type or a reciprocating type may be used as the compression element.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 510 Stator core 511 Annular part 512 Teeth part 512a Inner surface 520,520A Coil 521,521A Protrusion part 521a Inner surface 521b Outer surface 522 A part 530,530A, 530B, 530A, 530E 1530 Insulator 531B, 531C Peripheral wall portion 531a Inner surface 532, 532A, 532E Extension portion 532a Inner surface 533, 533A, 533B, 533C, 533D Teeth portion 534 Inner wall portion 535B Coupling portion 535C Locking portion 6 Rotor 12 Shaft

Claims (12)

A stator core (510) having teeth (512);
Insulators (530, 530A, 530B, 530C, 530E) disposed opposite to both end surfaces of the stator core (510) in the axial direction;
A coil (520, 520A) wound around the teeth portion (512) of the stator core (510),
The coil (520, 520A)
It has protrusions (521, 521A) located outside the stator core (510) in the axial direction from the teeth portion (512) of the stator core (510),
The inner surface (521a) on the radially inner side of the stator core (510) in the protrusion (521, 521A) is exposed,
The insulators (530, 530A, 530B, 530C, 530E)
An annular peripheral wall (531, 531A, 531B, 531C);
An extension portion (532) extending radially inward of the stator core (510) from the inner surface (531a) of the peripheral wall portions (531, 531A, 531B, 531C) in a direction overlapping the teeth portion (512) of the stator core (510). 532A, 532E), and
The inner surface (532a) on the radially inner side of the stator core (510) in the extending portion (532, 532A, 532E) is exposed and is radially inner on the teeth portion (512) of the stator core (510). The stator is located on the radially outer side of the stator core (510) with respect to the inner surface (512a) of the stator. The stator according to claim 1,
The inner surface (532a) of the extending portion (532, 532A) of the insulator (530, 530A, 530B, 530C) is the stator core (510) in the protruding portion (521, 521A) of the coil (520, 520A). The stator core is located on the radially outer side of the stator core (510) with respect to the outer surface (521b) on the radially outer side. The stator according to claim 2, wherein
The space between the projecting portion (521A) of the coil (520A) and the tooth portion (512) of the stator core (510) is larger toward the radially inner side of the stator core (510). Stator. The stator according to claim 2 or 3,
The protrusion (521, 521) of the coil (520, 520A) in the space between the protrusion (521, 521A) of the coil (520, 520A) and the tooth (512) of the stator core (510). The axial size of the stator core (510) on the outer surface (521b) side of 521A) is the thickness of the extended portion (532, 532A, 532E) of the insulator (530, 530A, 530B, 530C, 530E). A stator characterized by being the same. The stator according to claim 1,
The inner surface (532a) of the extended portion (532E) of the insulator (530E) is an inner surface (inside of the stator core (510) in the radial direction) of the protruding portion (521, 521A) of the coil (520, 520A). 521a) and a radially outer surface (521b) of the stator core (510) in the protrusion (521, 521A) of the coil (520, 520A). The stator according to any one of claims 1 to 5,
The stator characterized in that the inner surface (532a) of the extended portion (532, 532A, 532E) of the insulator (530, 530A, 530B, 530C, 530E) has a fracture surface. A rotor (6);
A motor comprising: the stator (5) according to any one of claims 1 to 6 disposed so as to surround an outer peripheral side of the rotor (6). A sealed container (1);
A compression element (2) arranged in the sealed container (1);
Compressor comprising a motor (3) according to claim 7, which is arranged in the sealed container (1) and drives the compression element (2) via a shaft (12). An annular peripheral wall portion (531, 531A, 531B, 531C) and a tooth portion (533, 533A, 533B, 533C, 533D) extending radially inward from the inner surface (531a) of the peripheral wall portion (531, 531A, 531B, 531C) And assembling the insulator (530, 530A, 530B, 530C, 530E) having the following structure on the axial end surface of the stator core (510) having the teeth portion (512);
The coils (520, 520A) are connected to the teeth (512) of the stator core (510) and the teeth (533, 533A, 533B, 533C, 533D) of the insulator (530, 530A, 530B, 530C, 530E). The process of winding together,
The insulator (530, 530A, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530B, 530C, 530E), and a step of removing from the other part other than the above part. The stator assembly method according to claim 9,
The step of removing at least a part of the teeth (533, 533A, 533D) of the insulator (530, 530A, 530E)
In the insulator (530, 530A, 530E) in which the peripheral wall portion (531, 531A) and the tooth portion (533, 533A, 533D) are continuously connected integrally, at least the tooth portion (533, 533A, 533D). By pulling a part of the stator core (510) inward in the radial direction, at least a part of the teeth (533, 533A, 533D) is broken and at least a part of the teeth (533, 533A, 533D) is broken. Is removed from the other part of the insulator (530, 530A, 530E). The stator assembly method according to claim 9,
The step of removing at least a part of the teeth portion (533B) of the insulator (530B),
In the insulator (530B) in which the peripheral wall portion (531B) and the teeth portion (533B) are mechanically connected via a coupling portion (535B), the teeth portion (533B) is radially inward of the stator core (510). The method of assembling a stator, comprising: removing the tooth portion (533B) from the peripheral wall portion (531B) by cracking the connecting portion (535B) by pulling on the peripheral wall portion. The stator assembly method according to claim 9,
The step of removing at least a part of the teeth portion (533C) of the insulator (530C),
In the insulator (530C) in which the peripheral wall portion (531C) and the teeth portion (533C) are mechanically connected via the locking portion (535C) of the teeth portion (533C), the teeth portion (533C) After removing the engaging portion (535C), the tooth portion (533C) is removed from the peripheral wall portion (531C) by pulling the teeth portion (533C) radially inward of the stator core (510). And a stator assembling method.

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