JP6742402B2 - Electric motor, compressor, and refrigeration cycle device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric motor, a compressor, and a refrigeration cycle device in which a stator winding is wound around each magnetic pole tooth of a stator core via an insulating component.

As shown in the longitudinal sectional view of FIG. 14, a stator in a conventional electric motor has coil ends for insulating the windings from both ends of a stator core 1420 formed by laminating a plurality of steel plates. An insulating member 1451 is provided. Further, the stator core 1420 has teeth that are magnetic pole teeth, and a thin insulating member 1452 is provided on the side surface of the base, which is the portion around which the winding is wound, of the teeth.

However, as shown in FIG. 14, the coil end insulating member 1451 according to the related art is fitted into both ends of the stator core 1420, and the peripheral edge portion of the coil end insulating member 1451 overlaps with the side surface of the tooth portion. A step is formed between the peripheral edge of the insulating member 1451 and the side surface of the tooth portion. Therefore, as shown in FIG. 14, since the dead space X is generated between the side surface of the tooth portion and the thin insulating member 1452, the winding efficiency is reduced and the efficiency loss of the electric motor is caused.

In order to solve this problem, there is known a stator having a structure in which a step portion is provided at both ends of a stator core and a coil end insulating member is fitted into the step portion (for example, see Patent Documents 1 and 2). .. As shown in the vertical cross-sectional view of FIG. 15, the stator core 2420 of Patent Document 1 has a plurality of steel plates of the same shape stacked together and a steel plate for inner diameter side fitting in which only the width of the base portion of the tooth portion is narrowed. It is formed by stacking on both ends in the stacking direction. In this way, the stator core 2420 has stepped portions formed at both ends of the base of the tooth portion, and the end portions of the stator protection member 2450 are fitted and attached to the stepped portions.

Further, as shown in the vertical cross-sectional view of FIG. 16, a stator core 3420 of Patent Document 2 is a convex core formed by laminating end core pieces with a narrowed core width at the base of the teeth portion at both ends. It has an end. A saddle-shaped coil end insulating member 3450 having a concave portion that fits into the convex core end portion is fitted to both ends of the stator core 3420. As shown in FIG. 17, the end of the thin insulator 3450c provided on the side surface of the stator core 3420 is folded and sandwiched between the stator core 3420 and the coil end insulating member 3450.

JP, 2005-171249, A JP, 2003-299289, A

However, the side surface of the stator core 1420 of Patent Document 1 is merely coated with an insulating coating. That is, in the configuration of Patent Document 1, since the winding and the stator core 1420 are insulated by only the insulating coating, it is not possible to deal with an increase in the core width of the stator or an increase in leakage current due to an increase in applied voltage. Further, since the coil end insulating member 3450 used in Patent Document 2 is a saddle-type insulating component, it is not possible to wind the winding around the tip of the tooth portion. Furthermore, since the end portion of the thin insulator 3450c is folded and sandwiched between the stator core 3420 and the coil end insulating member 3450, a dead space is generated at the folded portion of the thin insulator 3450c, and Insulation between the back yoke and the winding cannot be ensured.

The present invention has been made in view of the above problems, and a motor and a compressor that can realize a useful measure against an increase in leakage current due to an increase in the core width of a stator or an increase in applied voltage, and improve winding efficiency. , And a refrigeration cycle device.

An electric motor according to the present invention is an electric motor that includes a rotor that is driven to rotate about a rotation axis, and a stator that is provided in an annular shape on the outer peripheral side of the rotor, and the stator includes a plurality of electromagnetic waves. The stator core is formed by stacking steel plates, and has an annular back yoke portion and a plurality of teeth portions protruding from the back yoke portion toward the rotor, and both ends of the teeth portion in the axial direction of the rotating shaft. A pair of coil end insulating members, a side wall in the circumferential direction of the tooth part, and a wall part insulating member that covers an inner peripheral wall of the back yoke part continuous to the side wall, and a coil end insulating member and a wall part on the tooth part. A stator winding wound through an insulating member, and the teeth portion is provided on a base portion that is a portion around which the stator winding is wound, and a rotor-side end surface of the base portion, and The coil end insulating member has a yoke facing portion that faces the back yoke portion, a base facing portion that faces the base portion, and a tip end that faces the tip portion. Of the facing portion and the outer edge portion, the teeth side support members provided at both ends in the circumferential direction of the tip facing portion, and the position of the connecting portion between the yoke facing portion and the base facing portion of the outer edge portion. and having at least one yoke-side support member provided, to state, and are not for supporting the wall insulating member by the tooth-side support member and the yoke support member, the stator iron core, in the circumferential direction of the tooth portion The side wall and the inner peripheral wall of the back yoke portion have a pair of step portions provided on the respective end sides in the axial direction, and the peripheral edge portion of the coil end insulating member is a step portion corresponding to the coil end insulating member. The coil-side insulating member has a peripheral edge portion that extends along the axial direction and that is disposed in a step portion that corresponds to the peripheral edge portion. A wall insulating member, the wall insulating member is inserted and grasped by being inserted into a yoke-side storage groove formed between a protruding portion corresponding to the wall insulating member and a peripheral portion, The height of the protrusion is half the height of the peripheral wall .

In the present invention, the stator core has a step portion, the coil end insulating member covers both end portions of the tooth portion, and the peripheral edge portion is arranged at the step portion. The wall insulating member covers the side wall of the tooth part and the inner peripheral wall of the back yoke part. Therefore, it is possible to reduce the dead space between the side wall of the tooth portion and the wall insulating member and to secure the insulation between the stator core and the stator winding, so that the core width of the stator is expanded or applied. It is possible to effectively deal with an increase in leakage current due to an increase in voltage, and it is possible to improve winding efficiency.

It is a block diagram of the refrigerating-cycle apparatus which concerns on one embodiment of this invention. It is a schematic diagram showing an example of section composition of a compressor of Drawing 1. It is a schematic sectional drawing of the compression mechanism along the AA line of FIG. It is a schematic sectional drawing of the electric motor which followed the BB line of FIG. FIG. 5 is a connection diagram of a stator winding in the electric motor of FIG. 4. It is a perspective view which shows the split core which comprises the stator of FIG. It is a disassembled perspective view which shows the split core of FIG. It is a schematic longitudinal cross-sectional view along the DD line of FIG. 9 is a graph showing the relationship between the width dimension of the teeth portion of the stator core of FIG. 8 and the loss and efficiency. It is a top view which shows the state which looked at the coil end insulating member arrange|positioned above FIG. 7 from the downward direction. It is a top view which shows the state which looked at the coil end insulating member arrange|positioned at the lower part of FIG. 7 from the upper part. FIG. 7 is an enlarged view showing a part of the split core of FIG. 6 in a region E. FIG. 7 is a schematic cross-sectional view taken along the line FF of FIG. 6. FIG. 6 is a vertical cross-sectional view showing a stator core and an insulating member according to a conventional technique. FIG. 6 is a vertical cross-sectional view showing a stator core and an insulating member according to Patent Document 1. FIG. 11 is a vertical cross-sectional view showing a stator core and an insulating member according to Patent Document 2.

Embodiment.
FIG. 1 is a configuration diagram of a refrigeration cycle apparatus according to an embodiment of the present invention. As shown in FIG. 1, the refrigeration cycle apparatus 200 includes a compressor 100, a suction muffler 101, a four-way switching valve 103, an outdoor heat exchanger 104, a pressure reducer 105 such as electric expansion, and indoor heat exchange. And a container 106. The suction muffler 101 is connected to the suction side of the compressor 100. That is, in the refrigeration cycle apparatus 200, the compressor 100, the suction muffler 101, the four-way switching valve 103, the outdoor heat exchanger 104, the decompressor 105 such as electric expansion, and the indoor heat exchanger 106 are connected via piping. It has a refrigerant circuit formed by being formed.

The compressor 100 is a hermetic type compressor including, for example, a rotary compressor. The four-way switching valve 103 is connected to the discharge side of the compressor 100 and switches the flow of refrigerant from the compressor 100. The outdoor heat exchanger 104 is, for example, a fin-and-tube heat exchanger and exchanges heat between the outside air and the refrigerant. The decompressor 105 includes, for example, an electric expansion valve, and adjusts the flow rate of the refrigerant. The indoor heat exchanger 106 is composed of, for example, a fin-and-tube heat exchanger, and exchanges heat between the indoor air and the refrigerant. A plate-type heat exchanger may be adopted as the outdoor heat exchanger 104 or the indoor heat exchanger 106 so that water, antifreeze liquid, or the like can be used as the heat medium for exchanging heat with the refrigerant.

When the refrigeration cycle device 200 is applied to an air conditioner, the indoor heat exchanger 106 is generally mounted on a device such as an indoor unit arranged indoors, and the compressor 100 and the four-way switching valve 103 are installed. The outdoor heat exchanger 104 and the decompressor 105 are mounted on an apparatus such as an outdoor unit arranged outdoors. Further, in this case, the four-way switching valve 103 is connected to, for example, the solid line side in FIG. 3 during the heating operation, and is connected to the broken line side in FIG. 3 during the cooling operation.

Then, during the heating operation, the high-temperature and high-pressure refrigerant compressed by the compressor 100 flows into the indoor heat exchanger 106, is condensed and liquefied, and is then throttled by the decompressor 105 to become a low-temperature low-pressure two-phase state. It flows to the outdoor heat exchanger 104, evaporates, gasifies, and returns to the compressor 100 through the four-way switching valve 103. That is, the refrigerant in the refrigeration cycle apparatus 200 circulates as shown by the solid arrow in FIG. By this circulation, the refrigerant exchanges heat with the outside air in the outdoor heat exchanger 104 functioning as an evaporator, and the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 106 functioning as a condenser. That is, in the refrigeration cycle apparatus 200 during the heating operation, the refrigerant sent to the outdoor heat exchanger 104 absorbs heat from the outside air, and the absorbed refrigerant is sent to the indoor heat exchanger 106 via the compressor 100. , Heat the indoor air by exchanging heat with the indoor air.

Further, during the cooling operation, the high-temperature and high-pressure refrigerant compressed by the compressor 100 flows to the outdoor heat exchanger 104, is condensed and liquefied, and is then throttled by the decompressor 105 to become a low-temperature low-pressure two-phase state. It flows into the indoor heat exchanger 106, evaporates, gasifies, and returns to the compressor 100 through the four-way switching valve 103. That is, when the heating operation is changed to the cooling operation, the indoor heat exchanger 106 is changed from the condenser to the evaporator, and the outdoor heat exchanger 104 is changed from the evaporator to the condenser. Then, the refrigerant in the refrigeration cycle apparatus 200 circulates as indicated by the broken line arrow in FIG. By this circulation, the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 106 that functions as an evaporator, and the refrigerant exchanges heat with the outside air in the outdoor heat exchanger 104 that functions as an evaporator. That is, in the refrigeration cycle apparatus 200 during the cooling operation, the refrigerant sent to the indoor heat exchanger 106 absorbs heat from the indoor air, that is, cools the indoor air. The refrigerant that has absorbed heat from the indoor air in the indoor heat exchanger 106 is sent to the outdoor heat exchanger 104 via the compressor 100, exchanges heat with the outside air, and radiates heat to the outside air.

As the refrigerant circulated in the refrigeration cycle device 200, R407C refrigerant, R410A refrigerant, R32 refrigerant, or the like can be adopted. However, not limited to the single refrigerant as described above, a mixed refrigerant may be adopted.

FIG. 2 is a schematic diagram showing an example of a cross-sectional configuration of the compressor 100 of FIG. FIG. 3 is a schematic cross-sectional view of the compression mechanism 20 taken along the line AA of FIG. FIG. 4 is a schematic sectional view of the electric motor 30 taken along the line BB of FIG. 2 to 4, a 1-cylinder type rotary compressor is shown as an example of the compressor 100.

First, the overall configuration of the compressor 100 will be described with reference to FIG. The compressor 100 is configured by housing a compression mechanism 20 that compresses a refrigerant gas and an electric motor 30 that drives the compression mechanism 20 in a closed container 10. The closed container 10 is composed of an upper container 11 and a lower container 12. Here, as shown in FIGS. 3 and 4, the x-axis, the y-axis, and the z-axis are defined, the positive side of the z-axis is the upper side, the negative side of the z-axis is the lower side, and the z-axis direction is the axial direction. ..

The compression mechanism 20 is stored below the closed container 10, and the electric motor 30 is stored above the closed container 10. The compression mechanism 20 and the electric motor 30 are connected by a rotary shaft 21. The rotating shaft 21 transmits the rotational force of the electric motor 30 to the compression mechanism 20, and in the compression mechanism 20, the refrigerant gas is compressed by the transmitted rotational force, and the compressed refrigerant gas is discharged into the closed container 10. .. The closed container 10 is filled with compressed high-temperature and high-pressure refrigerant gas. Refrigerating machine oil for lubricating the compression mechanism 20 is stored below the closed container 10, that is, at the bottom.

An oil pump is provided below the rotary shaft 21. The oil pump pumps up the refrigerating machine oil stored at the bottom of the closed container 10 in accordance with the rotation of the rotary shaft 21 and supplies the refrigerating machine oil to the sliding parts of the compression mechanism 20. As described above, the refrigeration oil is supplied by the oil pump, so that the mechanical lubrication action of the compression mechanism 20 is ensured.

The rotary shaft 21 is composed of a main shaft portion 21a, an eccentric shaft portion 21b, and a sub shaft portion 21c. The main shaft portion 21a, the eccentric shaft portion 21b, and the sub shaft portion 21c are formed in this order from top to bottom along the axial direction. There is. An electric motor 30 is shrink-fitted or press-fitted and fixed to the main shaft portion 21a, and a cylindrical rolling piston 22 is slidably fitted to the eccentric shaft portion 21b.

FIG. 3 is a schematic cross-sectional view of the compression mechanism 20 taken along the line AA of FIG. 2 and seen from the upper surface side. The compression mechanism 20 includes a cylinder 23, a rolling piston 22, an upper bearing 24, and a lower bearing 25. , And vanes 26.

The cylinder 23 is internally provided with a cylinder chamber 23a, which is a cylindrical space having both axial ends opened. In the cylinder chamber 23a, the eccentric shaft portion 21b of the rotary shaft 21 that performs eccentric motion in the cylinder chamber 23a, the rolling piston 22 fitted to the eccentric shaft portion 21b, the inner circumference of the cylinder chamber 23a and the rolling piston 22 are provided. A vane 26 for partitioning a space formed by the outer circumference is housed.

The cylinder 23 has a vane groove 23c, one of which opens into the cylinder chamber 23a and the other of which has a back pressure chamber 23b. The vane 26 is accommodated in the vane groove 23c, and the vane 26 reciprocates in the vane groove 23c in the radial direction.

The vane 26 has a substantially rectangular parallelepiped shape in which the circumferential thickness of the cylinder chamber 23a is smaller than the radial (radial) and axial lengths (thickness) of the cylinder chamber 23a when the vane groove 23c is mounted in the vane groove 23c. Is. Here, the circumferential direction corresponds to the direction along the x-axis, and the radial direction corresponds to the direction along the y-axis.

A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c. The compression mechanism 20 is configured such that the high-pressure refrigerant gas in the closed container 10 flows into the back pressure chamber 23b, and the difference between the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a. The pressure creates a force that moves the vane 26 in the radial direction toward the center of the cylinder chamber 23a. The vane 26 is moved in the radial direction toward the center of the cylinder chamber 23a by the force due to the pressure difference between the back pressure chamber 23b and the cylinder chamber 23a and the force that the vane spring presses in the radial direction. The force that moves the vane 26 in the radial direction causes one end of the vane 26, that is, the end portion on the cylinder chamber 23a side, to abut on the cylindrical outer periphery of the rolling piston 22. By contacting the vane 26 with the outer circumference of the rolling piston 22, the space formed by the inner circumference of the cylinder 23 and the outer circumference of the rolling piston 22 can be partitioned.

As described above, the compression mechanism 20 in the present embodiment has the vane spring in the back pressure chamber 23b. For this reason, the differential pressure between the refrigerant gas in the closed container 10, that is, the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a presses the vane 26 to the outer circumference of the rolling piston 22. Even if the pressure is not sufficiently high, one end of the vane 26 can be pressed against the outer circumference of the rolling piston 22 by the force of the vane spring. That is, according to the compression mechanism 20, the state where one end of the vane 26 abuts on the outer circumference of the rolling piston 22 can be always maintained.

The upper bearing 24 is fitted into the main shaft portion 21a of the rotary shaft 21 and rotatably supports the main shaft portion 21a. The upper bearing 24 closes one opening in the axial direction of the cylinder chamber 23a, that is, the upper opening of the cylinder chamber 23a. Similarly, the lower bearing 25 is fitted to the sub shaft portion 21c of the rotary shaft 21 and rotatably supports the sub shaft portion 21c. The lower bearing 25 closes one opening in the axial direction of the cylinder chamber 23a, that is, the lower opening of the cylinder chamber 23a.

The cylinder 23 is provided with a suction port for sucking the refrigerant gas into the cylinder chamber 23a from the outside of the closed container 10. The upper bearing 24 is provided with a discharge port for discharging the compressed refrigerant gas to the outside of the cylinder chamber 23a. The upper bearing 24 has a substantially inverted T-shape in side view, and the lower bearing 25 has a substantially T-shape in side view.

A discharge valve is provided at the discharge port of the upper bearing 24, and the discharge valve controls the discharge timing of the high-temperature, high-pressure refrigerant gas discharged from the cylinder 23 through the discharge port. That is, the discharge valve closes until the refrigerant gas compressed in the cylinder chamber 23a of the cylinder 23 reaches a predetermined pressure, and opens when the pressure becomes equal to or higher than the predetermined pressure, so that the high-temperature and high-pressure refrigerant gas is released into the cylinder chamber 23a. Discharge to the outside.

Since the suction, compression, and discharge operations are repeated in the cylinder chamber 23a, the refrigerant gas discharged from the discharge port is discharged intermittently and becomes noise such as pulsating noise. In order to reduce such noise, a discharge muffler 27 is attached outside the upper bearing 24, that is, on the electric motor 30 side so as to cover the upper bearing 24. The discharge muffler 27 is provided with a discharge hole that communicates the space formed by the discharge muffler 27 and the upper bearing 24 with the inside of the closed container 10. The refrigerant gas discharged from the cylinder 23 through the discharge port is once discharged into the space formed by the discharge muffler 27 and the upper bearing 24, and then discharged into the closed container 10 through the discharge hole.

A suction muffler 101 that suppresses direct suction of the liquid refrigerant into the cylinder chamber 23 a of the cylinder 23 is provided beside the closed container 10. A gas-liquid two-phase refrigerant in which a low-pressure refrigerant gas and a liquid refrigerant are mixed is sent to the compressor 100 from a refrigerant circuit that constitutes the refrigeration cycle device 200. When the liquid refrigerant flows into the cylinder 23 and is compressed by the compression mechanism 20, the compression mechanism 20 fails, so the suction muffler 101 separates the liquid refrigerant and the refrigerant gas and sends only the refrigerant gas to the cylinder chamber 23a. The suction muffler 101 is connected to the suction port of the cylinder 23 by a suction connecting pipe, and the low-pressure refrigerant gas sent from the suction muffler 101 is sucked into the cylinder chamber 23a via the suction connecting pipe.

In the compression mechanism 20 configured as described above, the eccentric shaft portion 21b of the rotary shaft 21 rotates in the cylinder chamber 23a of the cylinder 23 due to the rotary motion of the rotary shaft 21. The compression chamber partitioned by the vane 26 and the outer circumference of the rolling piston 22 fitted to the eccentric shaft portion 21b and the inner circumference of the cylinder chamber 23a increases or decreases in volume as the rotary shaft 21 rotates.

Specifically, first, the compression chamber and the suction port communicate with each other, and the low-pressure refrigerant gas is sucked. Next, the communication of the suction port is closed, the volume of the compression chamber is reduced, and the refrigerant gas in the compression chamber is compressed. Finally, after the refrigerant gas in the compression chamber reaches a predetermined pressure in communication with the discharge port, the discharge valve provided in the discharge port opens, and the compressed refrigerant gas becomes high pressure/high temperature, which is outside the compression chamber, that is, the cylinder. It is discharged to the outside of the chamber 23a.

The high-pressure/high-temperature refrigerant gas discharged from the cylinder chamber 23a into the closed container 10 through the discharge muffler 27 passes through the electric motor 30, rises in the closed container 10, and is provided above the closed container 10. It is discharged from the discharge pipe 102 to the outside of the closed container 10. A refrigerant circuit through which a refrigerant flows is formed outside the closed container 10, and the discharged refrigerant circulates in the refrigerant circuit and returns to the suction muffler 101 again.

Next, with reference to FIG. 4, the electric motor 30 that transmits the rotational force to the compression mechanism 20 will be described. FIG. 4 is a schematic cross-sectional view of the electric motor 30 taken along the line BB of FIG. 2 and seen from the upper surface side. The electric motor 30 is a substantially cylindrical stator fixed to the inner circumference of the closed container 10. 41, and a substantially cylindrical rotor 31 arranged inside the stator 41.

The rotor 31 is composed of a rotor core 32 formed by laminating a plurality of iron core sheets punched from thin electromagnetic steel plates. The configuration of the rotor 31 includes one using a permanent magnet like a brushless DC motor and one using a secondary winding like an induction motor.

For example, when the rotor 31 is a brushless DC motor as shown in FIG. 4, a magnet insertion hole 33 is provided in the axial direction of the rotor core 32, and the magnet insertion hole 33 is made of a ferrite magnet or a rare earth magnet. The permanent magnet 34 is inserted. The permanent magnet 34 forms a magnetic pole on the rotor 31. The electric motor 30 rotates the rotor 31 by the action of the magnetic flux created by the magnetic poles on the rotor 31 and the magnetic flux created by the stator winding of the stator 41.

When the rotor 31 is an induction motor (not shown), the rotor core 32 is provided with a secondary winding instead of a permanent magnet, and the stator winding 46 of the stator 41 is a secondary winding on the rotor side. A magnetic flux is induced in the line to generate a rotational force, which causes the rotor 31 to rotate.

A shaft hole 35 through which the rotary shaft 21 is inserted is provided at the center of the rotor core 32, and the main shaft portion 21a of the rotary shaft 21 is fastened by shrink fitting or the like. As a result, the rotor 31 transmits its rotary motion to the rotary shaft 21. An air hole 36 is provided around the shaft hole 35, and the high-pressure/high-temperature refrigerant compressed by the compression mechanism 20 below the electric motor 30 passes through the air hole 36. In addition to the air holes 36, the refrigerant compressed by the compression mechanism 20 also passes through the air gap between the rotor 31 and the stator 41 and the gap of the stator winding 46.

The stator 41 includes a stator core 42, a plurality of coil end insulating members 45a, a plurality of coil end insulating members 45b, a plurality of wall insulating members 45c, and a stator winding 46. The stator 41 has a substantially cylindrical shape, and a substantially cylindrical rotor 31 is arranged at the center. That is, the stator 41 is provided in an annular shape on the outer peripheral side of the rotor 31. Hereinafter, when collectively referring to the plurality of coil end insulating members 45a, the plurality of coil end insulating members 45b, and the plurality of wall insulating members 45c, they are also simply referred to as insulating members 45.

Similar to the rotor 31, the stator core 42 is formed by laminating a plurality of iron core sheets punched from thin electromagnetic steel plates, and the outer diameter of the stator core 42 is smaller than the inner diameter of the middle portion of the lower container 12. It is made large and is fixed to the inner diameter of the lower container 12 by shrink fitting.

The stator core 42 has a back yoke portion 43 forming a cylindrical portion on the outer peripheral side, and the stator core 42 projects from the back yoke portion 43 toward the radial center side of the stator 41, that is, toward the rotor 31. And a plurality of teeth portions 44 that are formed. The teeth portions 44, which are a plurality of magnetic pole teeth, are provided at equal intervals along the inner circumference of the back yoke portion 43. Each tooth portion 44 constitutes a magnetic pole by being provided with a stator winding 46. A space in which the stator winding 46 can be accommodated, that is, a slot 47 is formed between the adjacent tooth portions 44.

A lead wire 51 is connected to the stator winding 46. The lead wire 51 is connected to a glass terminal 52 fixed to the closed casing 10, and electric power is supplied from the glass terminal 52. An external power supply that supplies electric power to the stator winding 46 via the lead wire 51 is connected to the glass terminal 52. The external power source is an inverter device or the like provided outside the closed container 10.

The stator winding 46 is an assembly of windings wound in the axial direction of the stator 41, that is, in the up-down direction, around each of the teeth portions 44 provided on the stator core 42 via the insulating member 45. The stator winding 46 is made of, for example, a copper wire or an aluminum wire covered with an insulating film. The windings that form the stator winding 46 are housed in the slots 47 provided between the two adjacent tooth portions 44 with almost no space. When a current is applied to the stator winding 46, each tooth portion 44 around which each winding is wound serves as a magnetic pole. The direction of the magnetic pole changes depending on the direction of the current flowing through the stator winding 46.

FIG. 5 is a connection diagram of the stator winding 46 in the electric motor 30 of FIG. Electric motor 30 in the present embodiment is a three-phase electric motor that generates a rotating magnetic field with three-phase alternating current. Generally, the stator windings of a three-phase motor are an assembly of three independent stator windings.

As shown in FIG. 5, the stator winding 46 includes a U-phase stator winding 46U corresponding to the U-phase, a V-phase stator winding 46V corresponding to the V-phase, and a W-phase fixed winding corresponding to the W-phase. It is an assembly of the child winding 46W. The lead wire 51 includes a lead wire 51u corresponding to the U phase, a lead wire 51v corresponding to the V phase, and a lead wire 51w corresponding to the W phase.

The U-phase stator winding 46U includes a winding 46a, a winding 46b, and a winding 46c wound around the corresponding teeth portion 44. That is, the U-phase stator winding 46U is configured by connecting the winding 46a, the winding 46b, and the winding 46c in series as shown in FIG. One of the ends of the U-phase stator winding 46U is connected to the neutral point 55, and the other end of the U-phase terminal 55u is connected to the lead wire 51u in the terminal block 50u to form the U-phase of the stator 41. To do.

Similarly, the V-phase stator winding 46V includes a winding 46d, a winding 46e, and a winding 46f wound around the corresponding tooth portions 44. That is, the V-phase stator winding 46V is configured by connecting the winding 46d, the winding 46e, and the winding 46f in series. One of the terminals of the V-phase stator winding 46V is connected to the neutral point 55, and the other terminal, the V-phase terminal 55v, is connected to the lead wire 51v in the terminal block 50v to form the V-phase of the stator 41. To do.

The W-phase stator winding 46W includes a winding 46g, a winding 46h, and a winding 46i wound around the corresponding teeth portion 44. That is, the W-phase stator winding 46W is configured by connecting the winding 46g, the winding 46h, and the winding 46i in series. One end of the W-phase stator winding 46W is connected to the neutral point 55, and the other end of the W-phase terminal 55w is connected to the lead wire 51w in the terminal block 50w to form the W-phase of the stator 41. To do.

By passing a current through the U-phase stator winding 46U, the V-phase stator winding 46V, and the W-phase stator winding 46W, the stator winding 46 is excited and each tooth portion 44 becomes a magnetic pole. .. The side surface of each tooth portion 44 in the circumferential direction with respect to the rotating shaft 21, that is, the side wall of each tooth portion 44 on the slot 47 side is an insulating member so that each tooth portion 44 and the stator winding 46 do not come into contact with each other. It is covered with 45. The terminal block 50u, the terminal block 50v, and the terminal block 50w are provided adjacent to each other.

With the configuration described above, the electric motor 30 rotates the rotor 31 by the action of the magnetic flux generated by the rotor 31 and the magnetic flux generated by the stator winding 46 of the stator 41, and transmits the rotational force to the rotary shaft 21. Then, it is transmitted to the compression mechanism 20 via the rotary shaft 21.

The rotational force generated by the electric motor 30, that is, the torque generated by the electric motor 30 follows the load amount required for each process of suction, compression, and discharge of the compression mechanism 20. That is, when the load amount of the compression mechanism 20 increases, the torque generated by the electric motor 30 also needs to increase. The torque generated by the electric motor 30 is generated by the action of the magnetic flux generated by the current flowing through the stator winding 46 and the magnetic flux of the permanent magnet or the secondary winding provided on the rotor 31. The magnitude of the torque generated by the electric motor 30 is determined by the magnitude of the magnetic flux generated by the stator 41 and the rotor 31.

Generally, the magnitude of the magnetic flux on the side of the rotor 31 is roughly determined at the time of design according to the design of the permanent magnet or secondary winding to be mounted, and among the factors that determine the magnitude of the magnetic flux of the stator 41. The number of times the stator winding 46 is wound is also determined at the time of design. Therefore, the magnitude of the torque generated by the electric motor 30 is controlled by increasing or decreasing the current flowing through the stator winding 46. That is, when the generated torque of the electric motor 30 is desired to be increased, the current flowing through the stator winding 46 is increased, and when the generated torque of the electric motor 30 is desired to be decreased, the current passed through the stator winding 46 is decreased.

The current flowing through the stator winding 46 can be controlled by an external power source connected via the lead wire 51 and the glass terminal 52. The generated torque required for the electric motor 30 can be generated according to the load amount of the compression mechanism 20 by an external power supply including an inverter device, for example. The inverter device applies an AC voltage having a phase difference of 120° to each of the U-phase stator winding 46U, the V-phase stator winding 46V, and the W-phase stator winding 46W of the electric motor 30 to drive the electric motor 30. To drive.

Here, the stator 41 according to the present embodiment is configured by connecting a plurality of split cores in an annular shape. FIG. 4 illustrates the stator 41 including nine split cores. Since all of these split cores have the same configuration, the configuration of the split core shown in the range C of FIG. 4 will be specifically described below.

FIG. 6 is a perspective view showing a split core that constitutes the stator of FIG. 4. FIG. 7 is an exploded perspective view showing the split core of FIG. FIG. 8 is a schematic vertical sectional view taken along the line DD of FIG. That is, FIG. 8 shows a schematic cross-sectional view in the yz plane taken along the line DD of FIG. FIG. 9 is a graph showing the relationship between the width dimension of the teeth portion of the stator core of FIG. 8 and the loss and efficiency. FIG. 10 is a plan view showing a state in which the coil end insulating member arranged above FIG. 7 is viewed from below. FIG. 11 is a plan view showing a state in which the coil end insulating member arranged on the lower side of FIG. 7 is viewed from above. FIG. 12 is an enlarged view partially showing the split core of FIG. 6 in a region E range. FIG. 13 is a schematic cross-sectional view taken along the line FF of FIG. That is, FIG. 13 shows a schematic cross-sectional view in the xy plane taken along the line FF of FIG. The stator winding 46 is omitted in FIGS. 6 and 7. Further, in FIGS. 8 and 13, hatching to the stator core 42 is omitted in order to clearly show the structure of each constituent member.

As shown in FIGS. 6 and 7, the split core 41 a that constitutes the stator 41 has a stator core 42 a that is a part of the stator core 42. In this embodiment, the stator core 42 is formed by connecting nine stator cores 42a in an annular shape. Therefore, the stator core 42a is composed of a plurality of electromagnetic steel plates laminated in the thickness direction, that is, the axial direction. The stator core 42a includes a split yoke portion 43a that constitutes the back yoke portion 43, and a tooth portion 44 that projects from the split yoke portion 43a toward the rotor 31 side. The teeth portion 44 includes a base portion 44a that radially projects from a central portion of the split yoke portion 43a in the circumferential direction, and a tip portion 44b that is provided on an end surface of the base portion 44a and has a circumferential width wider than that of the base portion 44a. ,have. The base portion 44a is a portion around which the stator winding 46 is wound. The distal end portion 44b in the present embodiment is configured to extend from the end surface of the base portion 44a to the rotor 31 side while spreading in the left-right direction in the circumferential direction.

As shown in FIG. 8, the stator core 42a has stepped portions 424 in which the coil end insulating member 45a or the coil end insulating member 45b is fitted at one end and the other end in the axial direction of the rotary shaft 21, respectively. ing. Each step portion 424 is formed by a step portion 423 provided on both sides in the circumferential direction of the stator core 42a. Each step portion 423 is formed on the inner peripheral wall of the split yoke portion 43a and the side walls on both sides of the tooth portion 44 in the circumferential direction. Here, the side walls on both sides in the circumferential direction of the tooth portion 44 include both side walls of the base portion 44a and side walls on both sides in the circumferential direction of the tip end portion 44b. The inner peripheral wall of the split yoke portion 43a is the side wall of the split yoke portion 43a on the rotor 31 side. More specifically, as shown in FIG. 7, the step portion 423 includes a step end surface 421 and a step formed from the side wall in the circumferential direction of the tooth portion 44 to the inner peripheral wall of the split yoke portion 43a continuous to the side wall. It is constituted by the surface 422.

Here, the relationship between the width dimension of the teeth portion 44 of the stator core 42a and the loss and efficiency will be described with reference to FIGS. 8 and 9. By the way, since FIG. 8 is a schematic cross-sectional view taken along the line yz of FIG. 6, the stator core 42 a in FIG. 8 corresponds to the base portion 44 a of the tooth portion 44.

In FIG. 9, the ratio [%] of the narrow width dn that is the circumferential width of the base portion 44a in the step portion 424 to the wide width dw that is the circumferential width of the base portion 44a in the portion other than the step portion 424 is plotted on the horizontal axis, The loss [W] of the electric motor 30 and the efficiency [%] of the electric motor 30 are plotted on the vertical axis. As shown in FIG. 13, as the ratio of the narrow width dn to the wide width dw increases, the loss of the electric motor 30 decreases and the efficiency of the electric motor 30 increases. Then, it is understood that the loss and efficiency of the electric motor 30 are stable in a suitable state in the range where the ratio of the narrow width dn to the wide width dw is 70% or more.

Therefore, the stator core 42a of the present embodiment is configured such that the ratio of the narrow width dn to the wide width dw is 70% or more. That is, since the electric motor 30 has the stator core 42a in which the ratio of the narrow width dn to the wide width dw is 70% or more, the increase in iron loss due to the increase in the magnetic flux density of the teeth portion 44 is suppressed, and the efficiency is reduced. It can be prevented (within -1% with respect to the stepless core).

The split core 41a includes a coil end insulating member 45a fitted to a step portion 424 formed at one end of the stator core 42a, and a coil fitted to a step portion 424 formed at the other end of the stator core 42a. It has an end insulating member 45b and a pair of wall insulating members 45c which are gripped from above and below by the coil end insulating member 45a and the coil end insulating member 45b. The coil end insulating member 45a, the coil end insulating member 45b, and each wall insulating member 45c are made of, for example, a resin material or the like, and insulate the stator core 42 and the stator winding 46 from each other.

As shown in FIGS. 6 and 8, the coil end insulating members 45a and 45b are assembled so as to cover the entire ends of the stator core 42a. The shape of the peripheral portions of the coil end insulating members 45a and 45b corresponds to the shape of the step 424 of the stator core 42a. The coil end insulating members 45a and 45b each have a peripheral wall 451 extending from the peripheral portion corresponding to the step portion 423 toward the stator core 42a. The peripheral wall 451 extends vertically from the main bodies of the coil end insulating members 45 a and 45 b and has a peripheral end surface 452 facing the step end surface 421.

In the present embodiment, as shown in FIG. 8, split core 41a is formed such that wall thickness W ₁ which is the thickness of peripheral wall 451 in the circumferential direction is equal to width W ₂ of step end surface 421. There is. Therefore, when the coil end insulating members 45a and 45b are fitted into each step portion 424, the peripheral end surface 452 contacts the step end surface 421, and the connecting portion between the stator core 42a and the coil end insulating members 45a and 45b is flush. It becomes the state of. That is, the peripheral portions of the coil end insulating members 45a and 45b are flush with the side walls and the inner peripheral wall of the back yoke portion 43 in the circumferential direction of the teeth portion 44 corresponding to the peripheral portions.

As shown in FIGS. 10 and 11, each of the coil end insulating members 45a and 45b has a yoke facing portion 451p facing the split yoke portion 43a, a base facing portion 451q facing the base portion 44a, and a tip end portion 44b. And a tip facing portion 451r facing each other. The peripheral wall 451 is bent in an L-shape at the connecting portion Co between the yoke facing portion 451p and the base facing portion 451q.

In addition, the coil end insulating member 45a includes two teeth side supporting members 453 and one yoke side supporting member 454. The coil end insulating member 45b has two teeth side supporting members 453 and two yoke side supporting members 454.

The tooth side support members 453 are provided at both ends in the circumferential direction of the tip facing portion 451r. The teeth-side support member 453 has a rectangular parallelepiped storage wall 453w that is arranged so as to be parallel to the peripheral wall 451 located at the tip facing portion 451r. The height of the storage wall 453w is set to, for example, 1/3 of the peripheral wall 451. In the tooth side support member 453, the storage wall 453w is connected to the front end facing portion 451r with a predetermined space. Therefore, in the coil end insulating members 45a and 45b, a teeth side storage groove 453g into which the wall insulating member 45c can be inserted is formed at the connection portion between the peripheral wall 451 and the storage wall 453w. The width of the tooth-side storage groove 453g is set according to the thickness of the wall insulating member 45c.

The yoke-side support member 454 is provided outside the peripheral wall 451 at the position of the connection portion Co and has a protrusion 454w that protrudes along the peripheral wall 451. The height of the protrusion 454w is set to, for example, half the height of the peripheral wall 451. In the yoke-side support member 454, the protruding portion 454w is connected to the yoke facing portion 451p and the base facing portion 451q located at the connecting portion Co with a predetermined gap. Therefore, in the coil end insulating members 45a and 45b, a yoke-side storage groove 454g into which the wall insulating member 45c can be inserted is formed at the connecting portion between the peripheral wall 451 and the protrusion 454w. The width of the yoke-side storage groove 454g is set according to the thickness of the wall insulating member 45c.

The pair of wall portion insulating members 45c are gripped by the respective support members of the coil end insulating member 45a and the respective support members of the coil end insulating member 45b. That is, the pair of wall insulating members 45c include a tooth side storage groove 453g and a yoke side storage groove 454g included in the coil end insulating member 45a, and a tooth side storage groove 453g and a yoke side storage groove 454g included in the coil end insulating member 45b. Is gripped from above and below.

As shown in FIG. 7, the wall portion insulating member 45c includes a yoke side insulating member 451c arranged to face the surface of the split yoke portion 43a on the rotor 31 side, a base insulating member 452c covering the side wall of the base portion 44a, and a tip. And a tip insulating member 453c that covers the side wall of the portion 44b on the circumferential direction side. Here, the base insulating member 452c and the tip insulating member 453c are also collectively referred to as a tooth insulating member.

The respective ends Le having an L-shaped cross section at the joint between the yoke-side insulating member 451c and the base-side insulating member 452c are inserted into the opposing yoke-side housing grooves 454g. In the present embodiment, in consideration of the smoothness of the winding, the coil end insulating member 45a has the yoke side support member 454 only outside the one peripheral wall 451 at the position of the connection portion Co. Therefore, the three end portions Le shown in FIG. 7 are inserted into and supported by the yoke-side storage groove 454g. Further, as shown in FIG. 12 in which the region E is enlarged, the lower end portion of the tip end insulating member 453c is inserted into and supported by the facing tooth side storage groove 453g. That is, the upper end portion and the lower end portion of the tip end insulating member 453c are respectively inserted into and supported by the teeth-side storage grooves 453g facing each other.

That is, as shown in FIG. 13, the wall insulating member 45c is formed to cover the stator core 42a from each side wall in the circumferential direction of the teeth portion 44 to the inner peripheral wall of the split yoke portion 43a. Similarly, the peripheral edge portions of the coil end insulating members 45a and 45b are fitted into the respective step portions 424 so as to cover the stator core 42a from the respective side walls in the circumferential direction of the teeth portion 44 to the inner peripheral wall of the split yoke portion 43a. Is formed in. Therefore, according to the stator 41 to which the split cores 41a are connected, it is possible to ensure the insulation between the stator yoke 46 and the tip portions 44b of the back yoke portion 43 and the teeth portion 44. 46i can also be sufficiently wound around the back yoke portion 43 side and the tip end portion 44b side, and the winding efficiency can be improved.

The thickness of the wall insulating member 45c is set in the range of t0.075 mm to t0.250 mm, for example. That is, by adjusting the widths of the teeth-side storage groove 453g and the yoke-side storage groove 454g, it is possible to select the wall insulating member 45c having various thicknesses, so that the core width of the electric motor 30 is increased and the electric motor 30 is applied. It is possible to effectively deal with the leakage current generated due to the voltage increase.

In addition, in FIG. 4, a nine-slot type stator 41 configured by nine split cores is illustrated, but the stator 41 may be formed in an annular shape, and an arbitrary number such as twelve may be used. The stator 41 may be configured by connecting the split cores in an annular shape. Further, the stator core 42 is formed by connecting a plurality of stator cores 42a in an annular shape, but the present invention is not limited to this, and the stator core 42 is formed by stacking core sheets punched in an annular shape. May be formed integrally. Further, in FIG. 5, the case where the three phases of the stator winding 46 are connected has been described as an example, but the three phases of the stator winding 46 may be delta (Δ) connected.

As described above, in the electric motor 30 according to the present embodiment, the stator cores 42 are provided on the side walls in the circumferential direction of the teeth part 44 and the inner peripheral wall of the back yoke part 43 on the respective end sides in the axial direction. It has a pair of step portions 423. In addition, the stator 41 covers a pair of coil end insulating members 45a and 45b that covers both ends in the axial direction of each of the plurality of teeth portions 44, a side wall of each of the plurality of teeth portions 44, and an inner peripheral wall of the back yoke portion 43. The wall insulating member 45c is included. Then, the peripheral portions of the coil end insulating members 45a and 45b, which are the pair of coil end insulating members, are respectively arranged in the step portions 423 corresponding to the coil end insulating members. Therefore, in the stator 41, it is possible to reduce the dead space between the side wall of the tooth portion 44 and the wall portion insulating member 45c and ensure the insulation between the stator core 42 and the stator winding 46. .. Therefore, according to the electric motor 30, it is possible to effectively deal with the increase of the core width of the stator or the increase of the leakage current due to the increase of the applied voltage, and it is possible to improve the winding efficiency.

In addition, in the electric motor 30, the coil end insulating members 45a and 45b are fitted and assembled to the step portion 424 provided on the corresponding stator core 42a. Therefore, since the stator core 42a and the coil end insulating members 45a and 45b can be easily positioned, workability can be improved. In addition, the coil end insulating members 45a and 45b can be firmly fixed to the stator core 42a. Furthermore, since the stress against the load applied to the coil end insulating members 45a and 45b can be relieved when the stator winding 46 is wound, deterioration of the coil end insulating members 45a and 45b can be prevented, and as a result, the electric motor 30 The quality of can be improved. That is, according to the electric motor 30 having the above configuration, it is possible to increase the area in which each of the windings 46a to 46i can be wound while ensuring the insulation distance between the stator core 42 and the stator winding 46. Copper loss, which is one of motor losses, can be reduced.

In addition, the peripheral edge of each coil end insulating member 45a or 45b has a peripheral wall 451 that extends along the axial direction toward the stator core 42 and that is disposed in the step portion 423 corresponding to the peripheral edge. doing. Therefore, since the peripheral end surface 452 of the peripheral wall 451 contacts the step end surface 421 of the step portion 423, the width of each coil end insulating member 45a and 45b in the circumferential direction can be shortened. The dead space between the wall insulating member 45c can be further reduced.

In addition, the stator 41 is formed such that the wall thickness W ₂ of the peripheral wall 451 is equal to the width W _{1 of the} step portion. That is, in the stator 41, the stator core 42a and the coil end insulating members 45a and 45b are connected so as to be flush with each other in the circumferential direction of the teeth portion 44 and the inner peripheral wall of the back yoke portion 43. ing. That is, the peripheral portions of the coil end insulating members 45a and 45b are flush with the side walls of the teeth portion 44 and the inner peripheral wall of the back yoke portion 43 corresponding to the peripheral portions. Therefore, according to the electric motor 30, no dead space is generated between the side surface of the tooth portion 44 and the wall insulating member 45c, so that the winding efficiency can be improved and the efficiency of the electric motor 30 can be improved.

The wall insulating member 45c covers the connecting portion between the step portion 423 of the stator core 42a and the peripheral wall 451 of the coil end insulating members 45a and 45b, and the peripheral wall 451 and the inner peripheral wall of the split yoke portion 43a. It is arranged so as to abut on each side wall in the circumferential direction of the tooth portion 44. Therefore, sufficient insulation between the stator core 42 and the stator winding 46 can be ensured.

Further, each of the teeth portions 44 has a narrow width dn, which is the width in the circumferential direction of the base portion 44a at the position where the step portion 423 is formed, and the circumference of the base portion 44a at the position where the step portion 423 is not formed. The ratio to the wide width dw, which is the width in the direction, is 70% or more. Therefore, according to the electric motor 30, it is possible to suppress an increase in iron loss due to an increase in magnetic flux density of the teeth portion 44 and prevent a decrease in efficiency.

Further, each of the coil end insulating members 45a and 45b has a plurality of support members for supporting the wall insulating member 45c outside the peripheral edge portion. The wall insulating member 45c is gripped by each support member included in the pair of coil end insulating members 45a and 45b corresponding to the wall insulating member 45c. Each of the coil end insulating members 45a and 45b serves as a support member, and at least a pair of teeth side support members 453 provided on the tip end 44b side of the teeth portion 44 and at least a back yoke portion 43 side. It has one yoke side supporting member 454. Therefore, the electric motor 30 can stably support the wall insulating member 45c.

Further, each tooth side support member 453 has a storage wall 453w arranged so as to be parallel to the peripheral portion with a distance from the peripheral portion. Each wall insulating member 45c is inserted and gripped in a tooth side storage groove 453g formed between the storage wall 453w corresponding to the wall insulating member 45c and the peripheral edge. In addition, each of the yoke side support members 454 has a protrusion 454w that is arranged at a distance from the peripheral edge and protrudes along the peripheral edge. Each wall insulating member 45c is inserted and gripped in a yoke-side storage groove 454g formed between a protrusion 454w corresponding to the wall insulating member 45c and a peripheral portion. Therefore, in the electric motor 30, the wall insulating member 45c can be easily and stably attached to the coil end insulating members 45a and 45b. When the core width of the stator 41 is expanded or the voltage applied to the motor is increased, the leakage current is increased by changing the width of the tooth-side storage groove 453g and the yoke-side storage groove 454g and the thickness of the wall insulating member 45c. Can be usefully dealt with.

That is, the coil end insulating members 45a and 45b are fitted at their peripheral edges to the respective stepped portions 424 of the stator core 42a in a state where the wall insulating member 45c is inserted into the tooth side storage groove 453g and the yoke side storage groove 454g. .. Therefore, the wall insulating member 45c is gripped from above and below by the housing grooves of the coil end insulating member 45a and the housing grooves of the coil end insulating member 45b. Therefore, in the electric motor 30, the wall insulating member 45c can be easily attached in a stable state. Furthermore, the cross section of the yoke-side storage groove 454g is L-shaped corresponding to the connecting portion between the yoke-side insulating member 451c and the base insulating member 452c. Therefore, according to the coil end insulating members 45a and 45b having the yoke side housing groove 454g, the wall insulating member 45c can be held more stably than the linearly formed groove.

The above-described embodiment is a preferred specific example of the electric motor, the compressor, and the refrigeration cycle device, and the technical scope of the present invention is not limited to these modes. For example, in the above-described embodiment, the height of the protrusion 454w is set to about half of the peripheral wall 451. However, the height of the protrusion 454w is not limited to this. May be arbitrarily changed within a range that allows stable gripping. Similarly, the height of the storage wall 453w may be arbitrarily changed within a range in which the wall insulating member 45c can be stably held. In addition, although the case where the storage wall 453w has a rectangular parallelepiped shape is illustrated in FIG. 12 and the like, the shape of the storage wall 453w is not limited to this, and is appropriately changed within a range in which the wall insulating member 45c can be stably supported. You may. Further, a storage groove similar to the teeth-side storage groove 453g may be formed in the central portion in the radial direction of the base facing portion 451q, and the wall insulating member 45c may be inserted and supported. In addition, the wall insulating member 45c may have a structure in which the yoke side insulating member 451c, the base insulating member 452c, and the tip end insulating member 453c are integrally formed, and the individually formed yoke side insulating member 451c. The base insulating member 452c and the tip insulating member 453c may be included.

10 closed container, 11 upper container, 12 lower container, 20 compression mechanism, 21 rotary shaft, 21a main shaft part, 21b eccentric shaft part, 21c auxiliary shaft part, 22 rolling piston, 23 cylinder, 23a cylinder chamber, 23b back pressure chamber, 23c vane groove, 24 upper bearing, 25 lower bearing, 26 vane, 27 discharge muffler, 30 electric motor, 31 rotor, 32 rotor core, 33 magnet insertion hole, 34 permanent magnet, 35 shaft hole, 36 wind hole, 41 stator , 41a split core, 42 stator core, 42a, 1420, 2420, 3420 stator core, 43 back yoke part, 43a split yoke, 44 teeth part, 44a base part, 44b tip part, 45 insulating member, 45a, 45b, 1451 , 3450 coil end insulating member, 45c wall insulating member, 46 stator winding, 46U U-phase stator winding, 46V V-phase stator winding, 46W W-phase stator winding, 46a to 46i winding, 47 Slot, 50u, 50v, 50w terminal block, 51, 51u, 51v, 51w lead wire, 52 glass terminal, 55 neutral point, 55u U phase terminal, 55v V phase terminal, 55w W phase terminal, 100 compressor, 101 suction Muffler, 102 discharge pipe, 103 four-way switching valve, 104 outdoor heat exchanger, 105 decompressor, 106 indoor heat exchanger, 200 refrigeration cycle device, 421 step end surface, 422 step surface, 423 step portion, 424 step portion, 451 peripheral wall, 451c yoke side insulating member, 451p yoke facing part, 451q base facing part, 451r tip facing part, 452 peripheral edge surface, 452c base insulating member, 453 teeth side supporting member, 453c tip insulating member, 453g teeth side receiving groove , 453w storage wall, 454 yoke side support member, 454g yoke side storage groove, 454w protrusion, 1452 thin insulating member, 2450 stator protection member, 3450c thin insulator, dn narrow width, dw wide width.

Claims (6)

A motor having a rotor driven to rotate about a rotation axis, and a stator provided in an annular shape on the outer peripheral side of the rotor,
The stator is
A plurality of electromagnetic steel plates are laminated and formed, and a stator core having an annular back yoke portion and a plurality of teeth portions protruding from the back yoke portion in the direction of the rotor,
A pair of coil end insulating members that cover both ends of the tooth portion in the axial direction of the rotating shaft,
A wall portion insulating member that covers a side wall in the circumferential direction of the tooth portion and an inner peripheral wall of the back yoke portion that is continuous with the side wall;
A stator winding wound around the teeth portion via the coil end insulating member and the wall insulating member;
Equipped with
The teeth portion is
A base portion that is a portion around which the stator winding is wound,
A distal end portion provided on an end surface of the base portion on the rotor side, and having a circumferential width wider than the base portion;
The coil end insulating member,
A yoke facing portion facing the back yoke portion,
A base facing portion facing the base,
A tip facing portion facing the tip portion,
Of the outer side of the peripheral edge portion, teeth side support members provided at both ends in the circumferential direction of the tip facing portion,
Outer side of the peripheral portion, at least one yoke side support member provided at the position of the connecting portion between the yoke facing portion and the base facing portion, and
All SANYO supporting the wall insulation member by the tooth-side supporting member and said yoke-side support member,
The stator core has a pair of step portions that are the side walls in the circumferential direction of the teeth portion and the inner peripheral wall of the back yoke portion and that are provided on each end side in the axial direction,
The peripheral portion of the coil end insulating member is arranged at the step portion corresponding to the coil end insulating member,
The peripheral portion of the coil end insulating member has a peripheral wall extending along the axial direction and arranged in the step portion corresponding to the peripheral portion,
The yoke-side support member has a protrusion that protrudes along the peripheral edge,
The wall insulating member is inserted and gripped in a yoke side storage groove formed between the protrusion and the peripheral portion corresponding to the wall insulating member, and the height of the protrusion is An electric motor that is half the height of the peripheral wall . The electric motor according to claim 1 , wherein the wall thickness of the peripheral wall is equal to the width of the step portion. The tooth portion has a narrow width which is a width in the circumferential direction of the base portion at a position where the step portion is formed, and a wide width which is a width in the circumferential direction of the base portion at a position where the step portion is not formed. The electric motor according to claim 1 or 2 , wherein the ratio to the ratio is 70% or more. The teeth side support member has a storage wall arranged to be parallel to the peripheral portion,
The wall insulation member is any one of claims 1 to 3 which is gripped is inserted into the tooth side receiving groove formed between said housing wall corresponding to the wall insulating member and the peripheral edge portion The electric motor according to item. Compressor comprising an electric motor according to any one of claims 1-4. A refrigeration cycle apparatus including the compressor according to claim 5 .

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