JP6406373B2 - Compressor motor, compressor, refrigeration cycle apparatus, and compressor motor manufacturing method - Google Patents

Description

  The present invention relates to a compressor motor incorporated in a compressor.

Generally, a hermetic compressor includes a compression mechanism that compresses a refrigerant in a hermetic container and an electric motor that drives the compression mechanism, and the compression mechanism and the electric motor are connected via a rotating shaft.
The electric motor is composed of a stator fixed in the hermetic container and a rotor provided inside the fixed body and rotated by a magnetic action. The rotating shaft transmits the rotational motion of the rotor to the compression mechanism, and compresses the refrigerant by the compression mechanism using the transmitted rotational motion.
The stator is composed of a stator core in which a plurality of magnetic pole teeth are radially provided at predetermined intervals along the inner peripheral portion, and a winding wound around the magnetic pole teeth via an insulating member. . The winding is connected to a lead wire drawn out of the electric motor, and is connected to a glass terminal provided in the sealed container via a connector. The winding and the lead wire are connected by soldering or press contact terminals (see, for example, Patent Document 1).

  The stator winding is generally a copper wire having a low electrical resistance, but may be used in addition to a copper wire such as an aluminum wire for cost reduction (see, for example, Patent Document 2).

As the refrigerant compressed by the compression mechanism, a refrigerant according to the purpose and application, such as R32 refrigerant having a low global warming potential (hereinafter referred to as GWP), is used to prevent global warming in recent years. .
In addition, when using a brushless DC motor, the operation range is increased by increasing the number of rotations by driving the current phase from the motor induced voltage to weaken the magnetic flux at the number of rotations at which the motor terminal voltage becomes the inverter output voltage. Control is also used (see, for example, Patent Document 3).

  Also, in a compressor for an air conditioner, based on the load torque pattern according to the rotational position, the output torque of the motor is controlled to the output torque according to the rotational position, and control for reducing vibration and noise in the low speed region is also possible. Used (see, for example, Patent Document 4).

JP 2001-197699 A (page 3-4, FIG. 1-3) JP 2008-173001 A (page 4) JP 2001-115963 A (pages 6 and 7) Japanese Patent Laid-Open No. 61-4492 (page 2-3)

In a conventional hermetic compressor, a winding of an electric motor and a lead wire drawn from the electric motor are generally connected by a connecting member such as soldering, brazing, or a pressure contact terminal.
On the other hand, the R32 refrigerant for preventing global warming has a higher operating temperature than the conventional R407C refrigerant or R410A refrigerant, and is used under conditions where the discharge temperature is about 10 ° C. higher. Since the entire motor is heated by the discharged high-temperature refrigerant, the motor is used under a higher temperature condition than in the past.
Further, when an aluminum wire is used for the winding, the electric resistance is higher than that of the copper wire, and the winding temperature rises. Since the stator is heated by the windings, the electric motor is used under a higher temperature condition than before.
In addition, control of the motor, for example, vibration suppression control that suppresses vibration caused by the suction operation and discharge operation of the compression mechanism, and the counter electromotive force generated on the rotor side in the high-speed rotation region is suppressed to increase the rotation speed. When field-weakening control or the like is performed, the current that flows is increased, and the winding temperature rises. Thereby, an electric motor is used on high temperature conditions compared with the past.
On the other hand, when the operating temperature of the motor becomes high, the crimping terminal that connects and fixes the winding and lead wire loosens the fixing state of the winding and lead wire due to the difference in the coefficient of thermal expansion of the material of each part, There was a problem that the electrical contact between the winding, the lead wire, and the press contact terminal was lowered, and the electrical resistance at the connection portion was increased. And if the electrical resistance at the connecting portion increases, the efficiency of the motor is reduced and the temperature of the connecting portion is increased, and the thermal expansion of the winding, lead wire, and press contact terminal is promoted. There was a problem that the fixed state increased the looseness.
In particular, when the material of parts is different, such as copper material, brass material, and aluminum material, the difference in thermal expansion coefficient of each material is large, so that there is a problem that looseness is large and electrical resistance is likely to increase.

Also, when the winding and lead wire are soldered or brazed, the winding and lead wire are connected via solder or brazing material, so the electrical resistance of the connection part is the material of the winding or lead wire There is a problem that the efficiency of the motor is lowered and the temperature of the connection portion is increased. Generally, the connection part connected by soldering or brazing is protected from contact with other conductors by a protective member such as a sleeve, but in the control of flowing a large current such as vibration suppression control or field weakening control. Further, since the temperature rise of the connecting portion is also increased, there is a problem that the protective member also needs high heat resistance.
In addition, an oxide film is formed on the surface of the winding and lead wires, and soldering and brazing are due to the wetting phenomenon between the base material and the molten metal, so flux is used to chemically remove the oxide film To do. However, if flux remains in the joints, the windings or lead wires are corroded, and foreign substances such as sludge are generated due to chemical reaction with the refrigerant or refrigerating machine oil. There is a risk of clogging the throttle valve. For this reason, there is a problem that an increase in manufacturing cost and a decrease in productivity are caused, for example, it is necessary to add a cleaning process. In particular, a material having a strong oxidizing action such as an aluminum material has a problem in that the action of the welding flux for removing the oxide film becomes strong, so that the corrosiveness becomes high and the necessity for cleaning increases.

  The present invention was made to solve the above problems, and in joining the stator winding and the lead wire of the compressor motor, different metals are used for the stator winding and the lead wire, Highly reliable compressor motor, compressor and compressor that prevent generation of foreign matter such as sludge from the joint without removing the oxide film, using flux, or cleaning the joint The object is to obtain a refrigeration cycle apparatus.

An electric motor for a compressor according to the present invention is an electric motor for a compressor having a cylindrical stator and a rotor disposed inside the stator. The electric motor for the compressor has a cylindrical back yoke and an inner side from the back yoke. A stator core having a plurality of protruding teeth, an insulating member attached to an axial end surface of the stator core, a stator winding wound around the teeth via the insulating member, and a stator winding A lead wire made of a different metal and connected to an external power source; and a joint portion where the end face of the stator winding and the end face of the lead wire are abutted and joined by cold welding, and the insulating member has the joint portion It has a storage part composed of a storage chamber for storing and a groove for locking the conducting wire, and in the joint part, foreign matter adhering to the end face of the stator winding and the end face of the lead wire is pushed out to the outer peripheral part. burr is formed, the stator windings and Lead wires are engaged with the groove, the joint is accommodated in the accommodating chamber, the burr is one covered with a resin.

An electric motor for a compressor according to the present invention includes a cylindrical back yoke, a stator core having a plurality of teeth projecting inwardly from the back yoke, an insulating member attached to an axial end surface of the stator core, and teeth The stator winding wound around the insulation member, the lead wire made of a metal different from the stator winding and connected to the external power source, the end face of the stator winding and the end face of the lead wire are butt cooled The insulating member includes a storage chamber configured to store the bonding portion and a groove for locking the lead wire, and the bonding portion includes: A burr is formed by extruding foreign matter adhering to the end face of the stator winding and the end face of the lead wire to the outer periphery, the stator winding and lead wire are locked in the groove, and the joint is stored in the storage chamber. It is, because the burr is covered with a resin, the stator Using different metals for the wire and lead wire, and suppressing the generation of foreign matter such as sludge from the joint without removing the oxide film, using flux, or cleaning the joint A highly reliable electric motor for compressor, compressor, and refrigeration cycle apparatus can be obtained.

It is the schematic which shows an example of the cross-sectional structure of the hermetic compressor which concerns on Embodiment 1 of this invention. It is sectional drawing of the compression mechanism of the hermetic compressor which concerns on Embodiment 1 of this invention. 1 is a configuration diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. FIG. It is sectional drawing of the electric motor of the hermetic compressor which concerns on Embodiment 1 of this invention. It is explanatory drawing of the stator winding | coil of the electric motor which concerns on Embodiment 1 of this invention. It is a connection diagram of the stator winding | coil of the electric motor which concerns on Embodiment 1 of this invention. It is a block diagram of the insulating member of the electric motor which concerns on Embodiment 1 of this invention. It is explanatory drawing of the place which attached the insulating member of the electric motor which concerns on Embodiment 1 of this invention to the stator. It is explanatory drawing of the place which attached the insulating member of the electric motor which concerns on Embodiment 1 of this invention to the stator. It is explanatory drawing of the accommodating part of the insulating member which concerns on Embodiment 1 of this invention. It is explanatory drawing of the torque change of the hermetic compressor which concerns on Embodiment 1 of this invention. It is explanatory drawing about the joining method of the conducting wire concerning Embodiment 1 of this invention. It is explanatory drawing of the accommodating part of the insulating member which concerns on Embodiment 2 of this invention. It is explanatory drawing of another form of the accommodating part of the insulating member which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Here, a rotary compressor will be described as an example.
1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1, that is, a cross-sectional view of a compression mechanism as viewed from above. The overall configuration of a hermetic compressor that is an example of a one-cylinder rotary compressor will be described with reference to FIG. The hermetic compressor 100 includes a hermetic container 10 in which a compression mechanism 20 that compresses refrigerant gas and an electric motor 30 that drives the compression mechanism 20 are housed. The sealed container 10 includes an upper container 11 and a lower container 12, and the compression mechanism 20 is housed below the sealed container 10 and the electric motor 30 is housed above the sealed container 10. The compression mechanism 20 and the electric motor 30 are connected by a rotary shaft 21, and the rotary shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism 20, and the refrigerant gas is compressed by the transmitted rotational force in the compression mechanism 20 so that the sealed container is sealed. 10 is discharged. The sealed container 10 is filled with compressed high-temperature and high-pressure refrigerant gas, and refrigerating machine oil is stored below the sealed container 10, that is, at the bottom for lubricating the compression mechanism 20.
An oil pump is provided below the rotary shaft 21, and the oil pump pumps up the refrigerating machine oil stored at the bottom of the sealed container 10 as the rotary shaft 21 rotates, and supplies the oil to each sliding portion of the compression mechanism 20. . Thereby, the mechanical lubrication effect | action of the compression mechanism 20 is ensured.

  The rotating shaft 21 includes 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 in the axial direction. 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.

  2 is a cross-sectional view of the compression mechanism 20 taken along the line AA in FIG. 1 and viewed from the upper surface side. The compression mechanism 20 includes a cylinder 23, a rolling piston 22, an upper bearing 24, a lower bearing 25, and a vane 26. It is configured. The cylinder 23 is provided with a cylindrical space opened at both ends in the axial direction, that is, a cylinder chamber 23a. In the cylinder chamber 23a, there are an eccentric shaft portion 21b of the rotating shaft 21 that performs an eccentric motion in the cylinder chamber 23a, a rolling piston 22 fitted to the eccentric shaft portion 21b, an inner periphery of the cylinder chamber 23a, and an outer periphery of the rolling piston 22 And a vane 26 for partitioning the space formed by.

  One of the cylinders 23 is opened in the cylinder chamber 23a, and the other is formed with a vane groove 23c provided with a back pressure chamber 23b. A vane 26 is accommodated in the vane groove 23c. The vane 26 reciprocates in the radial direction in the vane groove 23c. The shape of the vane 26 is a substantially rectangular parallelepiped shape in which the thickness in the circumferential direction of the cylinder chamber 23a is smaller than the length in the radial direction of the cylinder chamber 23a and the axial direction of the cylinder chamber 23a when attached to the vane groove 23c. A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c. Normally, the high-pressure refrigerant gas in the sealed container 10 flows into the back pressure chamber 23b and moves toward the center of the cylinder chamber 23a due to the differential pressure between the pressure of the back pressure chamber 23b and the refrigerant gas in the cylinder chamber 23a. To produce a force to move the vane 23 in the radial direction. The vane 23 is moved in the radial direction toward the center of the cylinder chamber 23a by the force due to the differential pressure in the back pressure chamber 23b and the force pressed by the vane spring in the radial direction. The force for moving the vane 23 in the radial direction brings one end of the vane 23, that is, the end on the cylinder chamber 23 a side into contact with the cylindrical outer periphery of the rolling piston 22. Thereby, the space formed by the inner periphery of the cylinder 23 and the outer periphery of the rolling piston 22 can be partitioned. The pressure difference between the refrigerant gas in the sealed container 10, that is, the pressure of the refrigerant gas in the back pressure chamber 23 b and the pressure of the refrigerant gas in the cylinder chamber 23 a is not sufficient to press the vane 23 against the outer periphery of the rolling piston 22. Even in this case, one end of the vane 23 can be pressed against the outer periphery of the rolling piston 22 by the force of the vane spring, so that one end of the vane 23 can always abut against the outer periphery of the rolling piston 22.

  The upper bearing 24 is fitted to the main shaft portion 21a of the rotary shaft 21 and rotatably supports the main shaft portion 21a, and closes one opening portion in the axial direction of the cylinder chamber 23a. Similarly, the lower bearing 25 is fitted to the sub-shaft portion 21c of the rotary shaft 21 so as to rotatably support the sub-shaft portion 21c, and closes one opening in the axial direction of the cylinder chamber 23a. The cylinder 23 is provided with a suction port for sucking refrigerant gas into the cylinder chamber 23a from the outside of the sealed container 10, and the upper bearing 24 is provided with a discharge port for discharging compressed refrigerant gas to the outside of the cylinder chamber 23a. ing. The upper bearing 24 has a substantially inverted T shape in a side view, and the lower bearing 25 has a substantially T shape in a side view.

  The discharge port of the upper bearing 24 is provided with a discharge valve, and controls the discharge timing of the high-temperature and high-pressure refrigerant gas discharged from the cylinder 23 via the discharge port. In other words, 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 refrigerant gas reaches a predetermined pressure or higher, and discharges the high-temperature / high-pressure refrigerant gas to the outside of the cylinder chamber 23a. Discharge.

  Since the suction, compression, and discharge operations are repeated in the cylinder chamber 23a, the refrigerant gas discharged from the discharge port is intermittently discharged, resulting in noise such as pulsation noise. In order to reduce this, a discharge muffler 27 is attached to the outside of 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 sealed container 10. The refrigerant gas discharged from the cylinder 23 through the discharge port is once discharged into a space formed by the discharge muffler 27 and the upper bearing 24 and then discharged into the sealed container 10 from the discharge hole.

  A suction muffler 101 that suppresses liquid refrigerant from being directly sucked into the cylinder chamber 23 a of the cylinder 23 is provided beside the sealed container 10. Generally, the hermetic compressor 100 is supplied with a mixture of low-pressure refrigerant gas and liquid refrigerant from an external circuit to which the hermetic compressor 100 is connected. When the liquid refrigerant flows into the cylinder 23 and is compressed by the compression mechanism 20, the compression mechanism 20 fails. Therefore, 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 through a suction connection pipe, and the low-pressure refrigerant gas sent from the suction muffler 101 is sucked into the cylinder chamber 23a through the suction connection pipe.

As described above, the compression mechanism 20 is configured, and the eccentric shaft portion 21 b of the rotary shaft 21 rotates in the cylinder chamber 23 a of the cylinder 23 by the rotary motion of the rotary shaft 21. The volume of the working chamber partitioned by the inner periphery of the cylinder chamber 23a, the outer periphery of the rolling piston 22 fitted to the eccentric shaft portion 21b, and the vane 26 increases / decreases as the rotating shaft 21 rotates. First, the working chamber and the suction port communicate with each other, and low-pressure refrigerant gas is sucked. Next, the communication of the suction port is closed, and the refrigerant gas in the working chamber is compressed as the volume of the working chamber decreases. Finally, after the refrigerant gas in the working chamber reaches a predetermined pressure in communication with the discharge port, the discharge valve provided in the discharge port opens and is compressed outside the working chamber, that is, outside the cylinder chamber 23a, to become high pressure and high temperature. The refrigerant gas discharged is discharged.
The high-pressure and high-temperature refrigerant gas discharged from the cylinder chamber 23 a into the sealed container 10 through the discharge muffler 27 passes through the electric motor 30, rises in the sealed container 10, and is provided above the sealed container 10. The discharge pipe 102 discharges the outside of the sealed container 10. A refrigeration circuit through which refrigerant flows is configured outside the sealed container 10, and the discharged refrigerant circulates in the refrigeration circuit and returns to the suction muffler 101 again.

  FIG. 3 is a schematic configuration diagram of a refrigeration cycle apparatus such as an air conditioner to which the hermetic compressor 100 is connected. The refrigeration cycle apparatus 200 includes a suction muffler 101 of the hermetic compressor 100 connected to the suction side of the hermetic compressor 100, and a refrigerant flow from the hermetic compressor 100 connected to the discharge side of the hermetic compressor 100. A four-way switching valve 103, an outdoor heat exchanger 104, a decompressor 105 for electric expansion and the like, and an indoor heat exchanger 106, which are sequentially connected via a pipe to form a refrigeration circuit. ing. In general, in a refrigeration air conditioner, the indoor heat exchanger 106 is mounted on an indoor device, and the remaining hermetic compressor 100, four-way switching valve 103, outdoor heat exchanger 104, and decompressor 105 are mounted on an outdoor device. ing.

  For example, in the heating operation of the air conditioner, the four-way switching valve 103 is connected to the solid line side in FIG. The high-temperature and high-pressure refrigerant compressed by the hermetic compressor 100 flows into the indoor heat exchanger 106, condenses and liquefies, and is then squeezed by the decompressor 105 to become a low-temperature and low-pressure two-phase state. It flows to 104, evaporates, is gasified, returns to the hermetic compressor 100 through the four-way switching valve 103 again. That is, the refrigerant circulates as shown by the solid line arrows in FIG. By this circulation, the outdoor heat exchanger 104 that is an evaporator exchanges heat with the outside air, the refrigerant sent to the outdoor heat exchanger 104 absorbs heat, and the absorbed heat is the indoor heat exchange that is a condenser. It is sent to the vessel 106 to exchange heat with the indoor air and warm the indoor air.

  In the case of cooling operation, the four-way switching valve 103 is connected to the broken line side in FIG. The high-temperature and high-pressure refrigerant compressed by the hermetic compressor 100 flows to the outdoor heat exchanger 104, condenses and liquefies, and is then squeezed by the decompressor 105 to become a low-temperature and low-pressure two-phase state. The gas flows to 106, evaporates, gasifies, and returns to the hermetic compressor 100 again. 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. Therefore, the refrigerant circulates as shown by the broken line arrows in FIG. By this circulation, the indoor side heat exchanger 106 that is an evaporator exchanges heat with the indoor air, absorbs heat from the indoor air, that is, cools the indoor air, and the absorbed refrigerant is an outdoor heat exchanger that is a condenser. It is sent to 104, heat exchange with outside air is performed, and heat is radiated to outside air.

  At this time, R407C refrigerant, R410A refrigerant, R32 refrigerant or the like is generally used as the refrigerant.

Next, the electric motor 30 that transmits the rotational force to the compression mechanism 20 will be described.
4 is a cross-sectional view of the electric motor 30 taken along the line BB ′ of FIG. 1 and viewed from the upper surface side. The electric motor 30 includes a substantially cylindrical stator 41 fixed to the inner periphery of the sealed container 10; A substantially columnar rotor 31 is provided inside the stator 41.

The rotor 31 is composed of a rotor core 32 formed by laminating iron core sheets punched from thin electromagnetic steel sheets. There are two types of rotors, one using a permanent magnet such as a brushless DC motor and the other using a secondary winding such as an induction motor. For example, in the case of 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 a permanent magnet 34 such as a ferrite magnet or a rare earth magnet is inserted into the magnet insertion hole. Yes. The permanent magnet 34 forms a magnetic pole on the rotor 31. The rotor 31 is rotated by the action of the magnetic flux generated by the magnetic poles on the rotor 31 and the magnetic flux generated by the stator winding of the stator 41.
In the case of an induction motor (not shown), the rotor core 32 is provided with a secondary winding instead of a permanent magnet, and the stator winding of the stator 41 induces magnetic flux to the secondary winding on the rotor side. Thus, a rotational force is generated, and the rotor 31 is rotated.

  A shaft hole through which the rotation shaft 21 is passed is provided at the center of the rotor core 32, and the main shaft portion 21a of the rotation shaft 21 is fastened by shrink fitting or the like. Thereby, the rotational motion of the rotor 31 is transmitted to the rotating shaft 21. An air hole 35 is provided around the shaft hole, and high-pressure and high-temperature refrigerant compressed by the compression mechanism 20 below the electric motor 30 passes through the air hole 35. Note that the refrigerant compressed by the compression mechanism 20 passes through the air gap between the rotor 31 and the stator 41 and the gap between the stator windings in addition to the air holes 35.

The stator 41 includes a stator core 42, an insulating member 43, and a stator winding 44. The stator 41 has a substantially cylindrical shape, and a substantially columnar rotor 31 is arranged at the center.
The stator core 42 is formed by laminating core sheets obtained by punching thin magnetic steel sheets in the same manner as the rotor 31, and the outer diameter of the stator core 42 is made larger than the inner diameter of the intermediate portion of the lower container 12. The inner diameter of the lower container 12 is fixed by shrink fitting. The stator core 42 includes a back yoke 45 that forms a cylindrical portion on the outer peripheral side, and a plurality of protrusions protruding from the back yoke 45 at the center side in the radial direction of the stator 41, that is, in the direction of the rotor 31. It consists of magnetic pole teeth or teeth 46. The teeth 46 are provided with stator windings 44 to form magnetic poles. A space that can accommodate the stator winding 44, that is, a slot 47 is formed between the teeth.

  A lead wire 48 is connected to the stator winding 44. The lead wire 48 is connected to a glass terminal 49 fixed to the sealed container 10, and power is supplied from the glass terminal 49. An external power supply that supplies power to the stator winding 44 is connected to the glass terminal 49 via a lead wire 48. The external power source is provided outside the sealed container 10, for example, an inverter device. The stator winding 44 is an assembly of windings wound in the axial direction of the stator 41, that is, in the vertical direction, via the insulating member 43 around a plurality of teeth 46 provided on the stator core 42. 44 is accommodated in a slot 47 formed between the teeth with almost no gap. When a current is passed through the stator winding 44, the teeth 46 around which the stator winding 44 is wound become a magnetic pole. The direction of the magnetic pole varies depending on the direction of the current flowing through the stator winding 44.

  5 and 6 are connection diagrams of a stator winding of a general three-phase motor. In general, a stator winding of a three-phase motor is composed of an assembly of three independent windings, which are referred to as a U-phase stator winding, a V-phase stator winding, and a W-phase stator winding, respectively. .

For example, the stator 41 in FIGS. 5 and 6 includes teeth 46a to 46r and stator windings 44a to 44i. First, as shown in FIG. 5, the U-phase stator winding includes a stator winding 44a wound around teeth 46a, 46b, 46c, and a stator winding 44b wound around teeth 46g, 46h, 46i. The stator winding 44c is wound around the teeth 46m, 46n, 46o, and the stator winding 44a, the stator winding 44b, and the stator winding 44c are connected in series as shown in FIG. A U-phase stator winding 44k is configured. One end of the U-phase stator winding 44k is connected to the neutral point 44j, and the other end is connected to the lead wire 48u to constitute the U-phase of the stator 41. Similarly, the V-phase stator winding includes a stator winding 44d wound around the teeth 46e, 46f, 46g, a stator winding 44e wound around the teeth 46k, 46l, 46m, and the teeth 46q, 46r. And a stator winding 44f wound around 46a, and a stator winding 44d, a stator winding 44e, and a stator winding 44f are connected in series to form a V-phase stator winding 44l. ing. One end of the V-phase stator winding 44l is connected to the neutral point 44j, and the other end is connected to the lead wire 48v to constitute the V-phase of the stator 41. The W-phase stator windings are formed on the stator winding 44g wound around the teeth 46c, 46d, and 46e, the stator winding 44h wound around the teeth 46i, 46j, and 46k, and the teeth 46o, 46p, and 46q. The stator winding 44i is wound, and the stator winding 44g, the stator winding 44h, and the stator winding 44i are connected in series to form a W-phase stator winding 44m. One end of the W-phase stator winding 44m is connected to the neutral point 44j, and the other end is connected to the lead wire 48w to constitute the W-phase of the stator 41.
By passing a current through the U-phase, V-phase, and W-phase stator windings, the stator windings are excited, and the teeth 46a to 46r become magnetic poles.
The stator winding 44 and the lead wire 48 are copper wires, but may be aluminum wires. A mixed usage method may be used in which a copper wire is used for the lead wire 48 and an aluminum wire is used for the stator winding 44.
The slot 47 formed between the side surfaces in the circumferential direction with respect to the rotation axis 21 of the tooth 46, that is, between the teeth, is covered by the insulating member 43 so that the teeth 46 and the stator windings 44 do not contact each other. ing.

The insulating member 43 is a side surface in the circumferential direction with respect to the insulating member 43a, 43b, 43c attached to the end surface of the stator core 42 in the axial direction of the rotating shaft 21 and the inner wall of the slot 47, that is, the rotating shaft 21 of the tooth 46. It is comprised from the part (not shown) which covers. The insulating members 43a and 43b are mounted on the side where the lead wire 48 is disposed on the end surface of the stator core 42 in the axial direction of the rotating shaft 21, and the insulating member 43c is mounted on the opposite end surface. The insulating member 43a is provided with a storage 51 for the insulating member 43b. FIG. 7 shows 43 a among the insulating members 43. FIG. 7A shows a state where the stator core 42 is attached to the end surface of the stator core 42 in the axial direction of the rotary shaft 21, and is a view seen from the axial direction of the rotary shaft 21, that is, the top surface of the stator core 42. FIG. 7C is a diagram viewed from the outer peripheral side of the iron core 42, and FIG. 7C is a diagram viewed from the circumferential direction of the stator core 42, that is, from the side. FIG. 8 shows a state in which the insulating member 43 of FIG. 7 is attached to the stator core 42, and is a view seen from the axial direction of the rotation axis 21 of the stator core 42, that is, from above. FIG. 9 is a view of the state in which the insulating member 43 is mounted on the stator core 42 as viewed from the circumferential direction of the stator core 42, that is, from the side, and (a) is before winding the stator winding 44. (B) is sectional drawing cut | disconnected by CC 'of FIG. 8, after winding the stator coil | winding 44, (c).
Since the portion attached to the end surface of the stator core 42 in the axial direction of the rotary shaft 21 is provided for each tooth 46, FIG. 7 shows the insulating member 43 a divided for each tooth 46. The end surface of the rotating shaft 21 in the axial direction may be connected in an annular shape so as to go around the rotating shaft 21 axis.
The portion mounted on the end surface of the stator core 42 in the axial direction of the rotating shaft 21 is substantially arc-shaped along the shape of the back yoke 45 mounted on the end surface of the back yoke 45 of the stator core 42 in the axial direction of the rotating shaft 21. The outer wall 43d formed on the teeth 46, the inner wall 43e attached to the end surface of the tip end portion of the tooth 46 in the direction of the rotation axis 21 and the portion where the inner wall 43e is attached are removed in the axial direction of the rotation axis 21 of the tooth 46. And a teeth covering portion 43f that covers the end surface. That is, in the state where the insulating member 43a is attached to the end surface of the stator core 42 in the axial direction of the rotating shaft 21 as shown in FIG. 9A, the end surface of the stator core 42 of the insulating member 43a in the axial direction of the rotating shaft 21 The portion to be mounted is mounted on the end surface of the tooth 46 in the axial direction of the rotating shaft 21, the tooth covering portion 43 f covering the end surface, and provided on the outer peripheral side of the tooth covering portion 43 f in the axial direction of the rotating shaft 21 of the back yoke 45. An outer wall portion 43d attached to the end surface, and an inner wall portion 43e provided on the inner peripheral side of the tooth covering portion 43f and attached to the end surface of the tip end portion of the tooth 46 in the axial direction of the rotary shaft 21; A teeth covering portion 43f is provided between the portion 43d and the inner wall portion 43e. The outer wall portion 43d and the inner wall portion 43e are provided upright on the end surface of the stator core 42 in the axial direction of the rotating shaft 21, and each extend in the axial direction of the rotating shaft 21. The portion mounted on the end surface of the stator core 42 in the axial direction of the rotating shaft 21 has the same configuration regardless of whether the portion is mounted on the end surface of the stator core 42 in the axial direction of the rotating shaft 21.
Further, the outer wall portion 43d, the inner wall portion 43e, and the tooth covering portion 43f are provided for each tooth 46.
The insulating member 43 a is provided with a plurality of positioning projections 43 g and 43 h on the side of the insulating member 43 a that contacts the end surface of the stator core 42 in the axial direction of the rotating shaft 21. A hole corresponding to the positioning protrusion is provided on an end surface of the shaft 21 in the axial direction. At the time of mounting, this positioning projection can be mounted at a predetermined position by being inserted into the hole in the end surface of the stator core 42 in the axial direction of the rotating shaft 21. Note that the hole and the protrusion may have a fitting shape. Although not shown, the insulating members 43b and 43c have the same configuration and can be mounted at predetermined positions.
The portion covering the inner wall of the slot 47 and the portion attached to the end surface of the stator core 42 in the axial direction of the rotating shaft 21 may be integrated or separate.

  In the case of an insulating member in which the portion covering the inner wall of the slot 47 and the portion mounted on the end surface of the stator core 42 in the axial direction of the rotating shaft 21 are integrated, one of the stator cores 42 in the axial direction of the rotating shaft 21 From the end face side, the portion covering the inner wall of the slot 47 is inserted into the slot 47 and fitted so that the teeth 46 are sandwiched by the portion covering the inner wall of the slot 47. The portion of the slot 47 that covers the inner wall of the slot 47 reaches the other end surface in the axial direction of the rotation axis 21 of the stator core 42 and covers the inner wall of the slot 47. A portion attached to the end surface in the 21-axis direction is in contact with one end surface of the stator core 42 in the axial direction of the rotating shaft 21, and the insertion into the slot 47 is completed. And it is latched by the end surface of the rotating shaft 21 axial direction of the stator core 42. On the other end surface side of the stator core 42 in the axial direction of the rotating shaft 21, a portion mounted on the end surface of the stator core 42 in the axial direction of the rotating shaft 21 that does not have a portion covering the inner wall of the slot 47 is mounted. The portion covering the inner wall of the slot 47 inserted into the slot 47 from one end surface side of the stator core 42 in the axial direction of the rotating shaft 21 is locked or locked from the other end surface side of the stator core 42 in the axial direction of the rotating shaft 21. Mating. As a result, the portion covering the inner wall of the slot 47 is locked in the slot 47, and the portion attached to the end surface of the stator core 42 in the axial direction of the rotational axis 21 is also in the axial direction of the rotational axis 21 of the stator core 42. It is latched on the end face of.

  If the portion that covers the inner wall of the slot 47 and the portion that is attached to the end surface of the stator core 42 in the axial direction of the rotary shaft 21 are separate, the portion that covers the inner wall of the slot 47 is first inserted into the slot 47, In addition, a portion that is attached to the end surface of the stator iron core 42 in the axial direction of the rotary shaft 21 is attached to both end surfaces. The portion attached to the end surface of the stator core 42 in the axial direction of the rotating shaft 21 is engaged or fitted with the portion covering the inner wall of the slot 47 from each direction, and the portion covering the inner wall of the slot 47 is engaged in the slot 47. Stop or fix. For example, a claw is provided in a portion attached to the end surface of the stator iron core 42 in the axial direction of the rotary shaft 21, and a portion covering the inner wall of the slot 47 is sandwiched between the claw and the inner wall of the slot 47. Lock. At this time, the portion attached to the end surface of the stator core 42 in the axial direction of the rotating shaft 21 is also locked on the end surface of the stator core 42 in the axial direction of the rotating shaft 21 by the force with which the claw presses the inner wall of the slot 47. .

  The portions 43a, 43b and 43c attached to at least the end surface of the stator core 42 in the axial direction of the rotating shaft 21 of the insulating member 43 are formed of an insulating resin such as engineering plastic such as LCP (liquid crystal polymer). In the case where the portion covering the slot 47 is integrated, it is formed of an insulating resin such as the same engineering plastic. When the portion covering the slot 47 is a separate body, it may be made of an insulating film such as PET (polyethylene terephthalate) in addition to an insulating resin such as engineering plastic.

A portion of the stator winding 44 that covers the inner wall of the slot 47 of the insulating member 43 is attached to the inner wall of the slot 47, that is, the surface constituting the inner wall of the slot 47 of the tooth 46, and is fixed as shown in FIG. The teeth covering portion 43f is attached to the end surface of the teeth 46 constituting the end surface in the axial direction of the rotating shaft 21 of the core 42 and the end surface of the teeth 46 in the axial direction of the rotating shaft 21 constitutes the inner wall of the slot 47. In a state where the surface to be covered is covered with the insulating member 43, the insulating member 43 is wound around the tooth 46 as shown in FIG. 9B. As a result, the stator winding 44 and the teeth 46 are insulated (for example, FIG. 9C). The stator winding 44 is wound between the outer wall portion 43d and the inner wall portion 43e, and the stator winding 44 wound on the teeth 46 in a laminated manner is the outer wall portion 43d and the inner wall portion 43e. The outer wall 43d can be wound on the outer circumferential side without collapsing to the inner circumferential side by the inner wall 43e.
The insulating member 43 attached to the stator core 42 is fixed at the attached position by winding the stator winding 44.

The outer wall 43d of the insulating member 43a is provided with a storage 51 for storing a connection portion between the stator winding 44 and the lead wire 48. For example, FIG. 10 shows that a circumferential groove of the stator core 42 is provided in the outer wall portion 43d of the insulating member 43a in a state where the insulating member 43a is mounted on the end surface of the stator core 42 in the axial direction of the rotation shaft 21. The groove is used as the storage portion 51, and the joint between the stator winding 44 and the lead wire 48 is stored in the storage portion 51. The storage 51 is opened on the opposite side of the stator core 42 in the direction of the axis of rotation 21 of the stator core 42, that is, on the opposite side, ie, in the circumferential direction of the stator core 42. 10A is an external view of the insulating member 43a viewed from the axial direction of the rotation axis 21 of the stator core 42, that is, from above, and FIG. 10B is an external view of the insulating member 43a viewed from the outer peripheral side of the stator core 42. FIG. 4C shows the inside of the storage portion 51, and FIG. 5C shows that the insulating member 43 a viewed from the circumferential direction, that is, the side of the stator core 42 a is attached to the stator core 42 and wound around the stator winding 44. FIG.
The storage unit 51 is provided in each phase. For example, in FIGS. 5 and 6, each of the U phase, the V phase, and the W phase includes the joint portions 56 u, 56 v, and 56 w. , 51w are provided and each joint portion is accommodated.

With the configuration as 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 44 of the stator 41, and transmits the rotational force to the rotating shaft 21. Then, it is transmitted to the compression mechanism 20 via the rotating shaft 21.
The rotational force generated by the electric motor 30, that is, the generated torque, depends on the load amount required for the suction, compression, and discharge processes of the compression mechanism 20. That is, it is necessary to increase the torque generated by the electric motor 30 as the load amount of the compression mechanism 20 increases. The generated torque of the electric motor 30 is generated by the action of the magnetic flux generated by the current flowing through the stator winding 44 and the magnetic flux of the permanent magnet and the secondary winding provided in the rotor 31. The magnitude of the generated torque is determined by the magnitude of the magnetic flux generated by the stator 41 and the rotor 31. In general, the magnitude of the magnetic flux on the rotor 31 side is roughly determined at the time of design by the design of the permanent magnet or secondary winding to be mounted, and the stator winding is one of the factors that determine the magnitude of the magnetic flux of the stator 41. Since the number of turns 44 is determined at the time of design, the magnitude of the torque generated by the electric motor 30 is controlled by increasing or decreasing the current flowing through the stator winding 44. That is, in order to increase the generated torque of the electric motor 30, the current flowing through the stator winding 44 is increased, and when the generated torque is desired to be decreased, the current flowing through the stator winding 44 is decreased. The current flowing through the stator winding 44 can be controlled by an external power source connected through the lead wire 48 and the glass terminal 49, for example, an inverter device, and the inverter device can control the load amount of the compression mechanism 20. In addition, a necessary torque can be generated in the electric motor 30. The inverter device drives the electric motor 30 by applying alternating currents having different phases every 120 ° to the U-phase winding, the V-phase winding, and the W-phase winding of the electric motor 30.

  Here, a copper wire is generally used for the stator winding 44, but an aluminum wire is also used for cost reduction. However, when an aluminum wire is used, a conductive wire having the same wire diameter has an electric resistance of about 1.6 times that of a copper wire. If the load amount of the compression mechanism 20 does not change, the required load torque is the same, and the current flowing through the stator winding 44 does not change. Therefore, even when an aluminum wire is used for the stator winding 44, it is necessary to flow the same amount of current as when a copper wire is used. When a necessary current is passed, Joule heat generated by a stator winding using an aluminum wire increases compared to a stator winding using a copper wire, so that the operating temperature of the aluminum wire is higher than that of the copper wire. That is, the upper limit value of the temperature rise of the stator winding 44 is increased. In order to suppress the temperature rise of the stator winding 44, there is a method of increasing the wire diameter of the stator winding 44 and reducing the electrical resistance. However, since the magnitude of the load torque required by the compression mechanism 20 does not change, the same number of times of winding around the teeth 46 is necessary to secure the same amount of magnetic flux generated in the stator 41, and the stator winding Since there is a limit to the cross-sectional area of the slot 47 that accommodates the wire 44, there is a limit to the method of increasing the wire diameter of the stator winding 44 and reducing the electrical resistance to suppress the temperature rise. Therefore, there is a problem in using the copper wire and the aluminum wire at the same operating temperature.

  Further, in the hermetic compressor, there is a plan to use a refrigerant having a lower GWP than conventional R407C refrigerant or R410A refrigerant in order to prevent global warming in recent years. However, some refrigerants with low GWP have the same refrigeration cycle apparatus configuration as the conventional one, and in order to bring out the heat exchange capability equivalent to the conventional R407C refrigerant or R410A refrigerant, the operating temperature of the R407C refrigerant or R410A refrigerant Some need to operate at high operating temperature conditions. For example, an R32 refrigerant that is attracting attention as a low GWP refrigerant does not exhibit the heat exchange capability equivalent to that of an R407C refrigerant or an R410A refrigerant unless operated at a discharge temperature that is about 10 ° C. higher. When the hermetic compressor 100 is operated under such conditions, the high-pressure / high-temperature refrigerant compressed by the compression mechanism 20 passes through the electric motor 30 and is discharged from the discharge pipe 102 above the hermetic container 10 to the outside of the hermetic container 10. However, when the high-temperature refrigerant passes through the electric motor 30, the temperature of the electric motor 30 is also raised.

Further, the hermetic compressor 100 shown in FIG. 1 is a single rotary type in which the compression mechanism 20 is constituted by a pair of cylinders, a rolling piston, and a vane, and a suction process and a compression process are performed while the rolling piston makes one rotation. The discharge process is performed. The load amount, that is, the load torque required by the compression mechanism 20 during one rotation of the rolling piston varies depending on the process as shown by the solid line in FIG. The suction process does not require the most torque, and the greatest torque is required when moving from the compression process to the discharge process. On the other hand, since the generated torque of the electric motor 30 is almost constant, the angular velocity increases and decreases due to the difference between the load torque and the generated torque, the electric motor 30 generates rotation unevenness, rotational pulsation, and vibration. To do.
In order to suppress this vibration, in the external power source that supplies power to the hermetic compressor 100, that is, the inverter device, the generated torque of the motor is reduced based on the load torque corresponding to the rotational position of the compression mechanism 20. Depending on the frequency, the required torque is controlled, and as shown by the broken line in FIG. 11, the vibration unevenness is controlled by reducing the rotation unevenness and suppressing the rotation pulsation. However, when such control is performed, even if the average load torque of the compression mechanism 20 is small, the maximum load torque may reach about three times. Since the amount of current flowing through the stator winding 44 is proportional to the torque generated by the electric motor 30, the amount of current is increased / decreased and controlled according to the rotational position of the compression mechanism 20. Therefore, a large current flows through the winding at a predetermined rotational position, and the operating temperature of the winding at the predetermined rotational position rises remarkably.

In the brushless DC motor using a permanent magnet for the rotor 32, the frequency of the output voltage of the inverter device that supplies power to the electric motor 30 is varied to perform variable speed control of the electric motor 30. Due to recent energy saving and higher efficiency, the efficiency in the low speed region where the rotation speed is low is emphasized, the number of windings of the stator 41 is increased, or the permanent magnet 34 used for the rotor 31 is made to have a high magnetic force. Rare earth magnets are used. Therefore, in the high speed region where the rotational speed is high, the counter electromotive force generated by the permanent magnet 34 of the rotor 32 exceeds the voltage applied from the inverter device, so that no current can flow through the motor 30, and the rotational speed is increased further. Can not be. In order to prevent this, the current phase of the stator winding 44 is controlled, and a magnetic flux in the direction opposite to that of the permanent magnet 34 is generated in the magnetic pole of the stator, that is, the teeth, so that the magnetic flux of the permanent magnet 34, that is, the counter electromotive force of the permanent magnet 34. In many cases, field-weakening control is performed to reduce the above.
However, since a current for reducing the counter electromotive force other than the necessary generated torque is supplied in the field weakening control, a large current is generated, and the operating temperature of the winding is remarkably increased.

As described above, the operating temperature of the stator winding 44 increases as the improvement is made due to factors such as cost, environment, and efficiency, and it is necessary to use the stator winding 44 under high temperature conditions. Conventionally, for example, the insulating part has been able to realize the insulation type E type / 120 ° C. However, when the refrigerant is changed to R32, the insulation type is increased to about 155 ° C./F type with the increase in the temperature rise upper limit of the entire motor. It can be realized by changing to. In addition, when the winding is made of aluminum and the same output as before is obtained, or when the operating range is expanded by vibration suppression control or field weakening control, it can be realized by changing the insulation type. On the other hand, when the temperature rise of the winding increases, in a general method of connecting and fixing the stator winding 44 and the lead wire 48 by the pressing force of the press contact terminal, the stator winding 44, the lead wire 48, the press contact terminal Due to the difference in coefficient of thermal expansion of the metal used for this, the connection fixing portion is deformed, the fixing state of the stator winding 44 and the lead wire 48 is loosened, the electrical contact state is deteriorated, and the electric resistance is increased. Therefore, even though the conventional temperature condition is not a problem, even if an element that requires an expansion of the upper limit of the temperature condition is introduced and the insulation type is changed to a high-temperature rank accordingly, the stator winding 44 and the lead wire 48 There is a problem in the connection part of, and can not demonstrate sufficient ability.
There is a method of soldering or brazing the stator winding 44 and the lead wire 48, but the stator winding 44 and the lead wire 48 are connected via solder or brazing material. It is higher than the material of the winding and the material of the lead wire, and the efficiency of the electric motor 30 is reduced and the temperature of the connection portion is increased. Oxide films are formed on the surfaces of the stator windings 44 and the lead wires 48. When soldering or brazing, the oxide films are chemically removed with a flux. However, if the flux remains in the joint, the stator winding 44 or the lead wire 48 is corroded, and foreign matters such as sludge are generated due to a chemical reaction with the refrigerant or the refrigerating machine oil, and the sliding portion of the compressor is seized. There is also a risk of clogging the piping and throttle valve. Therefore, a cleaning process is necessary and there are many problems.
There is a method of using cold pressure welding in which the connection state of the stator winding 44 and the lead wire 48 does not change with temperature change. However, since burrs are generated at the connecting portion, which is a connecting portion, it is necessary to remove the burrs. . However, it is difficult to completely remove burrs, and the tip of the remaining burrs damages the insulation coating of other stator windings and other lead insulation, reducing the dielectric strength of the stator windings. Or the remaining thin part of the tip of the burr breaks or breaks up and becomes sludge. Therefore, the housing member 51 as shown in FIG. 10 is provided in the insulating member 43, and the joint portion by cold pressure welding is housed in the housing portion 51 and covered with an insulating resin, thereby being applied to the hermetic compressor 100.

FIG. 12 is an explanatory diagram of a joint portion in which two conductors (first conductor and second conductor) are cold-welded. Here, the first conductive wire and the second conductive wire are the stator winding 44 and the lead wire 48. 12A shows a state before joining, FIG. 12B shows a state during joining, and FIG. 12C shows a state where joining is completed.
Cold welding is a bonding state in which atomic bonding is caused between the metals by pressurizing and deforming the metal material. Normally, the inside of a metal is in a state of being regularly aligned and bonded by the action of electrons that travel around the nucleus, but the atoms that are aligned on the surface of the metal are in an unstable state (activated state) with no partner on the outside. For this reason, it is combined with oxygen atoms in the air to form a stable state, that is, an oxide film. Normally, even if metal materials are brought into contact with each other, since there is an oxide film, a bonding state that causes an atomic bond between the metals does not occur, but oxygen atoms are removed from the surface metal (oxide film is removed) When metals whose surfaces are activated are brought into contact with each other, even if different types of metals are brought into contact with each other, atomic bonds are caused by the action of electrons around the nucleus and bonded.
On the other hand, the press contact terminal is provided with a groove for sandwiching the lead wire in the metal piece forming the press contact terminal, sandwiching the lead wire in the groove, and continuing to press using the elastic force of the metal piece, thereby contacting the press contact terminal and the lead wire. Is to maintain. However, an oxide film is formed on each surface of the pressure contact terminal and the conductive wire, and since it is not a bond with the oxide film removed, the surface of the metal material is not activated and does not bond atomically. Is different. In addition, when another metal is melted, such as soldering or brazing, another metal is inserted between the metal materials to be joined, and the surface of the metal material to be joined is activated and atomically bonded. Since it is not a thing, it differs from the joining state of cold pressure welding.
In the cold welding of the present application, since the end faces of the conducting wires are joined together, the joining area is small, and there is no method of cold welding by removing the oxide film, and the end faces of the conducting wires are left with the oxide film remaining. By continuously pushing in until the end face is deformed, a method is adopted in which all foreign matter including the oxide film on the end face is pushed out from the outer peripheral portion of the conducting wire. Therefore, the extruded foreign matter becomes a burr.
For example, the case where the terminal of the first conductor 52 and the terminal of the second conductor 53 are joined at the end surfaces 52a and 53a as shown in FIG. 12 will be described. First, the first conductor as shown in FIG. 52 and the second conducting wire 53 are clamped with a dedicated jig 54, the end surface 52a of the terminal portion of the first conducting wire 52 and the end surface 53a of the terminal portion of the second conducting wire 53 are butted, and the first conducting wire 52 is directed in the direction of the end surface 52a. The second conducting wire 53 is pressed and pressed in the direction of the end face 53a. The end surface 52a and the end surface 53a start to deform as shown in FIG. 12B, and the metal constituting the end surface 52a and the end surface 53a is pushed out in the radial direction of the first conductive wire 52 and the second conductive wire 53 and outside the outer peripheral surface. As a result, the foreign matter on the end surfaces 52 a and 53 a is also expelled from the outer peripheral surfaces of the first conductor 52 and the second conductor 53. Further, by pressing and pushing the first conducting wire 52 and the second conducting wire 53, the first conducting wire 52 and the second conducting wire 53 are joined by causing an atomic bond between the mutual metals. At the same time, as shown in FIG. 12 (c), the metal and foreign matter driven out from the outer peripheral surfaces of the first conducting wire 52 and the second conducting wire 53 become burrs 55.

In the joining by cold welding, all foreign matters on the end face of the conducting wire are pushed out as burrs 55 to the outside, so that the electrical characteristics of the joining portion 56 are not different from the base materials of the first conducting wire 52 and the second conducting wire 53. Electrical loss is small compared to the connection method. Since the bonding portion 56 is in a state in which an atomic bond is generated between the metals, the bonding portion 56 is not separated even when tension is applied to the connected conductive wire. The metals to be bonded may be the same type of metal such as copper and copper, or different types of metals such as copper and aluminum.
Conductive wires joined by cold welding can be used as a single continuous wire, regardless of whether the metal type changes before or after the joint, that is, on both sides, even if the winding, lead wire, and specifications change. It is easy to handle.
Further, in the method of the present invention, the foreign matter on the end face of the conducting wire to be joined is removed as the burr 55, so it is not necessary to remove the oxide film, and oxidation of the conducting wire is performed as in general cold welding. You may perform after removing a film.

A state in which the joint portion 56 of the first conducting wire 52 and the second conducting wire 53, that is, the connecting portion is housed in the housing portion 51 will be described with reference to FIG.
FIG. 10 shows a state in which a groove in the circumferential direction of the stator core 42 is provided on the outer wall 43d of the insulating member 43a in a state where the insulating member 43 is mounted on the end surface of the stator core 42 in the axial direction of the rotary shaft 21. Is the storage portion 51. The storage portion 51 is formed from the center portion of the outer wall portion 43d in the axial direction of the rotating shaft 21 in the direction opposite to the side in contact with the stator core 42, that is, upward, in the upper direction and the circumferential direction of the stator core 42. , Each is open. The groove is composed of a storage chamber 51a in the central portion in the circumferential direction and groove portions 51b on both sides thereof. The grooves 51b on both sides in the circumferential direction are formed to have the same width as the diameter of the first conducting wire 52 or the second conducting wire 53 in order to lock the first conducting wire 52 or the second conducting wire 53. The storage chamber 51a of the part is formed in a shape in which the width of the groove is wider than the width of the groove part 51b so that the burr 55 does not contact the inner wall of the groove. The storage chamber 51a is also extended from the groove 51b to the stator core 42 side. The first conductive wire 52 and the second conductive wire 53 are cold-welded and the first conductive wire 52 and the second conductive wire 53 are opened from the opening of the storage portion 51 so that the other joint portion 56 is located in the storage chamber 51 a of the storage portion 51. Is inserted into the groove 51b and pushed downward toward the stator core 42. And the 1st conducting wire 52 and the 2nd conducting wire 53 are latched by the groove part 51b. Thereby, the junction part 56 is accommodated in the storage chamber 51a.
In FIG. 10A, the storage chamber 51a is expanded in a cylindrical shape, but may be a rectangular parallelepiped shape as shown in FIG.
At this time, the burr 55 of the joint portion 56 may be removed or not removed. When the burr 55 is not removed, the burr 55 is stored in the storage unit 51, so that the step of removing the burr 55 can be omitted and the production efficiency can be improved.

An insulating resin is poured into the storage chamber 51a from the opening of the storage portion 51 in a state where the joint portion 56 is stored, and is filled with the insulating resin. The joining portion 56 and the burr 55 are buried in an insulating resin and covered with the insulating resin. The resin to be filled may be filled in the entire groove forming the storage portion 51 or only in the storage chamber 51a.
As the resin to be filled, an acrylic or epoxy insulating resin having thermosetting and / or ultraviolet curable characteristics is used. After the container 51 is filled with the resin, the resin filled in the heating process and / or the ultraviolet irradiation process is cured. For example, in the case of a thermosetting resin, the resin can be cured in the drying process at the time of assembling the stator 41, and there is little addition of a new process. In the case of an ultraviolet curable resin, it can be cured by irradiation with ultraviolet rays for about 1 minute, and there is little loss in process time. If the resin has both thermosetting and ultraviolet curable properties, the resin is filled in the storage chamber 51a and then cured by ultraviolet irradiation. However, when the resin is not irradiated with ultraviolet rays and is not completely cured, Even if the resin stays in a gel state, it can be cured in the subsequent drying step, and the reliability of the step is high. The viscosity of the resin is preferably 0.5 Pa · s or more and 5.0 Pa · s or less, which does not flow out from the opening of the storage unit 51 until it is cured after the storage unit 51 is filled. It is desirable to adhere to the inner wall of the chamber 51a.
As described above, by filling and curing the insulating resin in a state where the joint portion 56 is stored in the storage chamber 51a, the joint portion 56 and the burr 55 are covered with the insulating resin and fixed in the storage chamber 51a. As a result, the first conducting wire 52, the second conducting wire 53, and the joining portion 56 are not detached from the housing portion 51 due to vibration or the like, and even if the burr 55 is broken, it cannot jump out of the insulating resin. The debris of the burr 55 is not scattered in the sealed container 10.

With such a configuration, even if the first conductor and the second conductor are joined by cold pressure welding in a sealed container, the joint is stored in the storage portion on the insulating member provided on the stator core. Since it is covered with the insulating resin, it is possible to prevent the burrs formed at the joint portion from being broken and the fragments from being scattered in the sealed container to become sludge. Further, it is possible to prevent the fragments from coming into contact with the stator windings or the lead wires, causing the electrodes to be short-circuited or leaked. In addition, since the joint is fixed in the storage part, the insulation coating of other stator windings and insulation of other lead wires are damaged by the tip of the burr of the joint, and the dielectric strength is reduced. This can also be prevented.
In addition, when a press contact terminal is used, the press contact terminal and the conductive wire are not buried and fixed with an insulating resin. Because, if the insulation contact resin and the lead wire are buried with an insulating resin, the elastic force of the pressure contact terminal is suppressed when the insulation resin is cured, the pressing force between the pressure contact terminal and the lead wire is reduced, and the electrical resistance is increased. Insulating resin enters the contact portion of the lead wire and obstructs the electrical contact state. Therefore, since the contact between the press contact terminal and the conductive wire depends on the pressing force thereof, the joining is likely to be loosened due to a temperature rise or vibration. On the other hand, in the case of cold welding, the metals constituting the conducting wire are joined by atomic bonds, so even if they are buried in an insulating resin and covered, the atomic bonding force between the metals constituting the conducting wire is reduced. In other words, the insulating resin does not enter the bonded portion and the electrical contact state is not hindered, and the bonded portion can be covered with the insulating resin. Thereby, it can be set as the structure which can fix more reliable joining and its junction part.

  In addition, the storage portion, that is, the storage portion of the outer wall portion of the insulating member, also serves as a guide path that leads the lead wire to the vicinity of the glass terminal so as to pass through the outer peripheral side of the end surface of the stator core in the axial direction of the rotating shaft 21, that is, on the back yoke. As a result, the wiring can be prevented from being tangled and damaged.

As described above, the first conductive wire and the second conductive wire used in the electric motor, that is, the stator winding and the lead wire are connected by cold pressure welding, and the joint portion cold-welded to the storage portion provided in the insulating member is stored and insulated. Compressor with high efficiency and high reliability that prevents the generation of sludge and other foreign matter from the joints without increasing the electrical resistance of the joints between the winding and the lead wire. An electric motor, a compressor, and a refrigeration cycle apparatus can be obtained.
In addition, when an attempt is made to increase the upper limit of the temperature rise of the motor, such as by expanding the operating range by using R32 refrigerant, aluminum wire winding, vibration suppression control or field weakening control, for example, conventionally, the insulation type is E Even if what is realized at the seed / 120 ° C. is changed to F / 155 ° C., the problem of the joint portion between the stator winding and the lead wire does not occur and can be realized.

Since the burr formed at the joint is housed in the housing and covered with an insulating resin, the burr is broken during the operation of the electric motor, and the fragments are scattered in the container for housing the motor, that is, the container of the compressor. Therefore, it is possible to prevent foreign matter such as sludge. In addition, the debris may come into contact with the stator windings and lead wires to short-circuit the electrodes, damage the insulation coating of the stator windings and the insulation coating of the lead wires, and It is also possible to prevent the dielectric strength from being lowered.
Also, since the burr formed at the joint is covered with an insulating resin, the tip of the burr at the joint comes into contact with other stator windings and lead wires, and the insulation coating for the stator windings It is possible to prevent the insulation strength of the stator winding and the lead wire from being reduced by damaging the insulation for the lead wire and the lead wire.

In addition, since soldering and brazing can be used without using flux, foreign matter such as sludge is generated by the residue of the flux corroding the stator windings and lead wires, or by chemical reaction with refrigerant or refrigeration oil. It is possible to suppress the occurrence of seizure of the sliding portion of the compressor and the clogging of the piping and the throttle valve.
In addition, since the stator winding and the lead wire are dissimilar metals, for example, aluminum wire and copper wire can be joined by cold pressure welding without using crimp terminals, soldering, brazing, There is no concern about the generation of foreign matter such as corrosion and sludge due to flux residues.
In addition, the stator winding and the lead wire are joined by cold welding, so that the electrical characteristics of the joint do not differ from the base material, and the electrical loss at the joint is lower than other connection methods. Since it can be made smaller, it can also contribute to improving the efficiency of the motor. That is, due to the difference in the coefficient of thermal expansion of the component material, the fixed state of the winding and the lead wire is loosened, the electrical resistance of the joint increases, or the electrical resistance of the joint is increased by connecting via solder or brazing material. Will not increase. Since the increase in the electrical resistance of the joint portion is suppressed, the temperature rise of the joint portion is also suppressed to a low level, and the storage portion for storing the joint portion can be configured without having to consider high heat resistance.
Moreover, the method of storing in the storage unit without removing the burr may be used, and the step of removing the burr can be omitted, and the production efficiency can be improved.

In addition, by using aluminum wires for the stator windings and lead wires, even if the temperature rise of the motor is promoted, since it is joined by cold pressure welding, the joined state of the joined portion does not change . Therefore, it is possible to obtain a motor with improved joint reliability without increasing the electrical resistance of the joint and reducing the efficiency of the motor. Moreover, the temperature rise as an electric motor can also be improved by suppressing the increase in the electrical resistance of a junction part.
In addition, the operation of the refrigeration cycle apparatus is used under conditions where the discharge temperature is about 10 ° C. high, and even if the temperature rise of the electric motor is promoted, since it is joined by cold pressure welding, the joining state of the joint changes. There is nothing. Therefore, it is possible to obtain a motor with improved joint reliability without increasing the electrical resistance of the joint and reducing the efficiency of the motor. Furthermore, even if high-temperature and fast-flowing refrigerant gas passes through the motor, the cold-welded joint is housed in the insulating member housing and covered with insulating resin, so that the burrs are crushed by the refrigerant gas. , Burr debris will not fly into the sealed container.
In addition, the hermetic compressor may be a single rotary type, and even if the vibration is large, the cold welded joint is housed in the insulation member housing, so the burr tip is fixed by vibration. It does not contact the stator winding or lead wire, damage the insulation coating of the stator winding or the insulation coating of the lead wire, and does not reduce the dielectric strength of the stator winding and lead wire. Furthermore, even if the vibration suppression control used in the single rotary type is performed and the temperature rise of the electric motor is promoted, since it is joined by cold pressure welding, the joining state of the joining portion does not change. Therefore, it is possible to obtain a motor with improved joint reliability without increasing the electrical resistance of the joint and reducing the efficiency of the motor.
In addition, in a hermetic compressor, a brushless DC motor is used to increase the upper limit rotational speed, and thus control such as field weakening control is performed, and even if the temperature rise of the motor is promoted, it is joined by cold welding. The joined state of the joined portion does not change. Therefore, it is possible to obtain a motor with improved joint reliability without increasing the electrical resistance of the joint and reducing the efficiency of the motor.

Embodiment 2. FIG.
The first embodiment has been described as a configuration used when the cold pressure welding is used for joining the lead wire and the stator winding. However, soldering or brazing is used for joining the lead wire and the stator winding. Even in this case, this configuration can be used. If the flux applied before joining remains for a long time, it corrodes the lead wires and the stator windings, so it must be cleaned. After cleaning, the joint is stored in the storage part provided in the insulating member and insulated. By covering with a conductive resin, it is possible to prevent a short circuit from coming into contact with other conductors or a stator core, or damage to other conductors and a decrease in dielectric strength.

  For example, referring to the embodiment shown in FIG. 10, as in the first embodiment, the first conductor 52 and the second conductor 53 are soldered or brazed with a joint 56 positioned in the storage chamber 51 a of the storage 51. As described above, the first conductive wire 52 and the second conductive wire 53 are inserted into the groove portion 51 b and pushed downward toward the stator core 42 from the opening of the storage portion 51. And the 1st conducting wire 52 and the 2nd conducting wire 53 are latched by the groove part 51b. Thereby, the junction part 56 is accommodated in the storage chamber 51a. Next, in a state in which the joining portion 56 is stored, the insulating resin is poured into the entire storage chamber 51a from the opening of the storage portion 51 or into only the groove forming the storage portion 51 or only into the storage chamber 51a. . The joining portion 56 is buried in an insulating resin and covered with the insulating resin.

As described above, the first conductive wire and the second conductive wire used in the motor, that is, the stator winding and the lead wire are connected by cold pressure welding, and the cold pressure welding joint portion is housed in the housing portion provided in the insulating member for insulation. Because it is covered with resin, it can be joined without increasing the electrical resistance of the joint between the winding and the lead wire, and it is also highly efficient and highly reliable for suppressing the generation of foreign matter such as sludge from the joint. An electric motor, a compressor, and a refrigeration cycle apparatus can be obtained.
In addition, when an attempt is made to increase the upper limit of the temperature rise of the motor, such as by expanding the operating range by using R32 refrigerant, aluminum wire winding, vibration suppression control or field weakening control, for example, conventionally, the insulation type is E Even if it can be realized by changing the type that can be realized at 120 ° C. to the type F / 155 ° C., the problem of the joint portion between the stator winding and the lead wire does not occur, and it can be realized.

Since the burr formed at the joint is housed in the housing and covered with an insulating resin, the burr is broken during the operation of the electric motor, and the fragments are scattered in the container for housing the motor, that is, the container of the compressor. Therefore, it is possible to prevent foreign matter such as sludge. In addition, the debris may come into contact with the stator windings and lead wires to short-circuit the electrodes, damage the insulation coating of the stator windings and the insulation coating of the lead wires, and It is also possible to prevent the dielectric strength from being lowered.
Also, since the burr formed at the joint is covered with an insulating resin, the tip of the burr at the joint comes into contact with other stator windings and lead wires, and the insulation coating for the stator windings It is possible to prevent the insulation strength of the stator winding and the lead wire from being reduced by damaging the insulation for the lead wire and the lead wire.

Embodiment 3 FIG.
In the first embodiment, in a state where the insulating member is mounted on the end surface in the rotation axis direction of the stator core, a groove is provided in the circumferential direction of the stator core on the outer wall portion of the insulating member, and the groove is used as a storage portion. The example which accommodated the junction part of a lead wire and a stator coil | winding in the accommodating part was shown. However, since the stator winding is supported so as not to collapse toward the outer peripheral side of the stator core, that is, the back yoke side, the strength is weakened by reducing the thickness of the outer wall in the radial direction and providing a groove-shaped storage portion. There is a possibility. In order to maintain strength and provide a storage portion, it is desirable not to provide a groove-shaped storage portion on the outer wall portion, but to provide a box-shaped or cylindrical storage portion on the outer wall portion, and an example will be described. .

FIG. 13 shows a case in which a storage portion 51 is provided on the end surface of the outer wall portion 43d of the insulating member 43a in the axial direction of the rotary shaft 21. 13 (a), 13 (b), and 13 (c) has a box-like shape in which the outer wall 43d is opened in the direction opposite to the side in contact with the stator core, that is, the storage chamber 51a is provided inside. Is provided. 13A is a view seen from the axial direction of the rotating shaft 21, that is, the top surface of the stator core 42, FIG. 13B is a view seen from the outer peripheral side of the stator core 42, and FIG. 13C is a stator core. It is the figure seen from the circumferential direction of 42, ie, the side. The upper open opening communicates with the storage chamber 51a. The lower surface of the storage chamber 51a is configured by an end surface of the outer wall portion 43d in the axial direction of the rotating shaft 21, and the side surface, that is, the side wall of the storage chamber 51a is erected on the end surface of the outer wall portion 43d in the axial direction of the rotating shaft. 42, two circumferential surfaces, a surface on the inner peripheral side of the stator core 42, and a surface on the outer peripheral side of the stator core 42. On the side wall in the circumferential direction of the storage portion 51, a conductor guide groove for locking the first conductor 52 and the second conductor 53 that are cold-welded is provided, and a conductor guide groove 57 is provided on one of the sidewalls. A conductive wire guide groove 58 is provided on the other side of the side wall so as to face each other with the storage chamber 51a interposed therebetween. The conducting wire guide grooves 57 and 58 are formed with substantially the same width as the wire diameter of the conducting wire in order to lock the first conducting wire 52 and the second conducting wire 53. The conducting wire guide grooves 57 and 58 communicate with the storage chamber 51 a, start from the center of each side wall, open upward, and are connected to the opening above the storage 51.
The outer wall portion 43d is connected to the adjacent outer wall portions 43d and may be formed in an annular shape.
As shown in FIG. 10 (d), the storage portion 51 may have a cylindrical shape opened upward, that is, in a direction opposite to the side where the outer wall portion 43d is in contact with the stator core. Since the distance between the inner wall of the storage portion 51 and the tip of the burr 55 need only be secured only in the direction in which the burr 55 of the joint portion 56 protrudes, the storage chamber 51a is formed in a cylindrical shape to eliminate wasted space. The storage chamber 51a can be made small.

  The first conductive wire 52 and the second conductive wire 53 are connected to the first conductive wire 52 in the conductive wire guide groove 57 and the second conductive wire in the conductive wire guide groove 58 from the upper opening so that the joint portion 56 is located in the storage chamber 51a. 53 is inserted, the first conductor 52 and the second conductor 53 are pushed downward toward the stator core 42 side, and the first conductor 52 and the second conductor 53 are locked to the conductor guide groove 57 and the conductor guide groove 58. To do. Thereby, the joining part 56 is accommodated in the storage chamber 51a. After the first conductors 52 and 53 are engaged with the conductor guide grooves 57 and 58, an insulating resin is filled from the opening of the storage part 51 in a state where the joint part 56 is stored in the storage chamber 51a. As in the first embodiment, the resin is an acrylic or epoxy insulating resin having thermosetting and / or ultraviolet curable properties, and is cured in a heating process, an ultraviolet irradiation process, etc., and is stored in the storage chamber 51a. Secure to. Thereby, the joining part 56 and the burr | flash 55 are fixed in the storage chamber 51a. The storage 51 is made of the same resin as the insulating member 43.

Although the example which provided the accommodating part 51 in the end surface of the rotating shaft 21 axial direction of the outer wall part 43d of the insulating member 43a demonstrated, you may provide in the outer peripheral side of the outer wall part 43d of the insulating member 43a, ie, the airtight container 10 side. In that case, the storage portion 51 is provided on the outer peripheral side surface of the outer wall portion 43d, and the side surface of the storage chamber 51a, that is, the side wall, is the outer peripheral side surface of the outer wall portion 43d and the circumferential direction provided on the side surface. It is composed of two surfaces and a side wall on the closed container 10 side, and a lower surface is provided on the stator core 42 side. An opening that communicates with the storage chamber 51a is provided above the storage 51, that is, in a direction opposite to the side where the outer wall 43d is in contact with the stator core. On the side wall in the circumferential direction of the storage portion 51, a conductor guide groove 57 is provided on one side and a conductor guide groove 58 is provided on the other side so as to face each other with the storage chamber 51a interposed therebetween. , 58 are in communication with the storage chamber 51a as in FIGS. 10 (a) to 10 (c), starting from the center of each side surface and open upward. It is connected.
The first conducting wire 52 and the second conducting wire 53 are inserted into, pushed into, and locked in the conducting wire guide groove 57 and the conducting wire guide groove 58, and the joining portion 56 is housed in the housing chamber 51a, filled with insulating resin, cured, and housed. 10 (a) to 10 (c) in which the bonding portion 56 and the burr 55 are fixed in the storage chamber 51a, the storage portion 51 is formed of the same resin as the insulating member 43, and the like. ).

Further, FIG. 14 shows that the first side wall 51c and the second side wall 51d are provided on the outer wall portion 43d as the storage portion in the radial direction of the rotation shaft 21 so that the side walls face each other. A gap 51e is provided between 51c and the second side wall 51d, and the joint portion 56 of the lead wire 48 and the stator winding 44 is disposed in the gap 51e. 14A is similar to FIG. 13, FIG. 14A is a view seen from the axial direction of the rotating shaft 21, that is, the top surface of the stator core 42, and FIG. 14B is a view seen from the outer peripheral side of the stator core 42. (C) is the figure seen from the circumferential direction, ie, side surface, of the stator core 42. The distance between the first side wall 51c and the second side wall 51d, that is, the width of the gap 51e is set to a width in which the joint portion 56 and the burr 55 can be accommodated. The first side wall 51c is provided with a conductive wire guide groove 57, and the second side wall 51d is provided with a conductive wire guide groove 58. The first side wall 51c starts from the center of each side surface and is open upward. Similarly to FIG. 13, the conductive wire guide grooves 57 and 58 are provided with substantially the same width as the wire diameter of the conductive wire in order to lock the first conductive wire 52 and the second conductive wire 53. If the viscosity of the resin is about 1.0 Pa · s or more and 5.0 Pa · s or less, the storage portion 51 can suppress outflow from the gap until the insulating resin to be filled is cured, and the remaining surface of the surrounding area There is no problem.
The first conducting wire 52 and the second conducting wire 53 are inserted into the conducting wire guide groove 57 and the second conducting wire 53 is inserted into the conducting wire guide groove 58 so that the joint portion 56 is positioned in the gap 51d. The conducting wire 52 and the second conducting wire 53 are pushed downward toward the stator core 42 side, and the first conducting wire 52 and the second conducting wire 53 are locked to the conducting wire guide groove 57 and the conducting wire guide groove 58. As a result, the joining portion 56 is disposed or accommodated in the gap 51d. After the first conductors 52 and 53 are locked to the conductor guide grooves 57 and 58, the gap 51d is filled with an insulating resin so as to cover the joint 56 in a state where the joint 56 is accommodated in the gap 51d. Thereafter, the resin is cured and fixed in the gap 51d. As a result, the joint 56 and the burr 55 are fixed in the gap 51d.

  In addition, although the conducting wire guide grooves 57 and 58 were demonstrated in the example opened upwards, you may open | release to the radial direction of the stator core 42, ie, the inner peripheral direction or the outer peripheral direction of the stator core 42. Furthermore, the conducting wire guide grooves 57 may be opened in the inner circumferential direction, and the conducting wire guide grooves 58 may be opened in the outer circumferential direction. . By configuring the opening directions of the conductor guide grooves 57 and 58 to be opposite to each other, the conductors are less likely to be detached from the conductor guide grooves 57 and 58.

As described above, in a state where the joint portion 56 is housed in the storage chamber 51a or in a state where the joint portion 56 is housed in the gap 51e, the housing portion 51a or the gap 51e is filled with an insulating resin and cured, thereby joining the joint portion. 56 and burrs 55 are covered with insulating resin and fixed in the storage chamber 51a or in the gap 51e, and the first conductive wire 52 and the second conductive wire 53 are also fixed to the storage portion 51. The second conductive wire 53 and the joining portion 56 are not detached from the storage portion 51. Even if the burr 55 is crushed, the burr 55 cannot jump out of the insulating resin, so that the debris of the burr 55 does not scatter into the sealed container 10.
By providing a rectangular parallelepiped or cylindrical storage part on the outer wall part of the insulating member, the storage part can be provided without reducing the strength of the outer wall part, and the insulation member can be made thinner in order to reduce the size of the motor. Even if it goes, it can be realized without reducing the strength of the outer wall.
By making the storage chamber 51a cylindrical, useless space of the storage chamber 51a with respect to burrs can be eliminated and the storage section itself can be made smaller.
In addition, a first side wall 51c and a second side wall 51d are provided in the radial direction of the rotary shaft 21 as a storage portion, and a gap 51e is formed between the first side wall 51c and the second side wall 51d. By accommodating the joint portion 56 in the gap 51e, the storage portion can be realized with a simple configuration and can be made cheaper than the storage portion having a rectangular parallelepiped shape or a cylindrical shape.

As described above, the first conductive wire and the second conductive wire used in the electric motor, that is, the stator winding and the lead wire are connected by cold pressure welding, and the joint portion cold-welded to the storage portion provided in the insulating member is stored and insulated. Compressor with high efficiency and high reliability that prevents the generation of sludge and other foreign matter from the joints without increasing the electrical resistance of the joints between the winding and the lead wire. An electric motor, a compressor, and a refrigeration cycle apparatus can be obtained.
In addition, when an attempt is made to increase the upper limit of the temperature rise of the motor, such as by expanding the operating range by using R32 refrigerant, aluminum wire winding, vibration suppression control or field weakening control, for example, conventionally, the insulation type is E Even if it can be realized by changing the type that can be realized at 120 ° C. to the type F / 155 ° C., the problem of the joint portion between the stator winding and the lead wire does not occur, and it can be realized.

Since the burr formed at the joint is housed in the housing and covered with an insulating resin, the burr is broken during the operation of the electric motor, and the fragments are scattered in the container for housing the motor, that is, the container of the compressor. Therefore, it is possible to prevent foreign matter such as sludge. In addition, the debris may come into contact with the stator windings and lead wires to short-circuit the electrodes, damage the insulation coating of the stator windings and the insulation coating of the lead wires, and It is also possible to prevent the dielectric strength from being lowered.
Also, since the burr formed at the joint is covered with an insulating resin, the tip of the burr at the joint comes into contact with other stator windings and lead wires, and the insulation coating for the stator windings It is possible to prevent the insulation strength of the stator winding and the lead wire from being reduced by damaging the insulation for the lead wire and the lead wire.

Similar to the second embodiment, the configuration of the third embodiment can also be used when soldering or brazing is used for joining the lead wire and the stator winding.
As in the second embodiment, the stator winding and the lead wire are connected by soldering or brazing, and the soldered or brazed joint is accommodated in the accommodating portion provided in the insulating member, and the insulating resin is used. Covered, highly efficient and reliable motor for compressors, compression that prevents other conductors and stator cores from coming into contact and short-circuiting, and damaging other conductors and reducing dielectric strength. And a refrigeration cycle apparatus can be obtained.
Therefore, when an attempt is made to increase the upper limit of the temperature rise of the motor, such as by expanding the operating range by using R32 refrigerant, aluminum wire winding, vibration suppression control or field weakening control, for example, conventionally, the insulation type is E Even if it can be realized by changing the type that can be realized at 120 ° C. to the type F / 155 ° C., the problem of the joint portion between the stator winding and the lead wire does not occur, and it can be realized.

  DESCRIPTION OF SYMBOLS 10 Sealing container, 11 Upper container, 12 Lower container, 20 Compression mechanism, 21 Rotating shaft, 21a Main shaft part, 21b Eccentric shaft part, 21c Countershaft 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 Air hole, 41 Stator, 42 Stator Iron core, 43 Insulating member, 43a Insulating member 1, 43b Insulating member 2, 43c Insulating member 2, 43d Outer wall part of insulating member, 43e Inner wall part of insulating member, 43f Teeth covering part, 43g Positioning protrusion 1, 43h Positioning protrusion 2, 44 Stator winding, 44a-44i Stator winding, 44j Neutral point, 44k U-phase stator Wire, 44l V-phase stator winding, 44m W-phase stator winding, 45 back yoke, 46 teeth, 46a-46r teeth, 47 slots, 48 lead wire, 48u U-phase lead wire, 48v V-phase lead wire, 48w W phase lead wire, 49 glass terminal, 51 storage portion, 51u U phase storage portion, 51v V phase storage portion, 51w W phase storage portion, 51a storage chamber, 51b groove portion, 51c first side wall, 51d second side wall, 51e Gap, 52 First Conductor, 52a End Surface of First Conductor, 53 Second Conductor, 53a End Surface of Second Conductor, 54 Dedicated Jig, 55 Burr, 56 Joint, 56u U Phase Joint, 56v V Phase Joint , 56w W-phase joint, 57 lead guide groove, 58 lead guide groove, 100 hermetic 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 apparatus.

Claims (9)

In an electric motor for a compressor having a cylindrical stator and a rotor disposed inside the stator,
The stator includes a cylindrical back yoke, a stator core having a plurality of teeth projecting inwardly from the back yoke, an insulating member attached to an axial end surface of the stator core, and the teeth on the teeth. A stator winding wound through an insulating member, a lead wire made of a metal different from the stator winding and connected to an external power source, an end face of the stator winding, and an end face of the lead wire And a joined portion joined by butt cold welding,
The insulating member includes a storage portion configured to include a storage chamber that stores the joint portion, and a groove that locks the conductor.
In the joint portion, a burr is formed by extruding foreign matter adhering to the end face of the stator winding and the end face of the lead wire to the outer peripheral portion,
The motor for a compressor, wherein the stator winding and the lead wire are locked in the groove, the joint portion is housed in the housing chamber, and the burr is covered with resin. The insulating member has an outer wall portion that holds the stator winding on an axial end surface of the back yoke,
Compressor motor according to claim 1, characterized in that the housing part digits set in the outer wall. The electric motor for a compressor according to claim 2, wherein the housing portion is configured by a groove in the outer wall portion provided in a circumferential direction of the stator core. The storage portion includes a first side wall provided on the outer wall in a radial direction of the stator core, and a second side wall provided on the outer wall so as to have a gap between the first side wall and the first side wall. The motor for a compressor according to claim 2, wherein The electric motor for a compressor according to any one of claims 1 to 4, wherein the resin is an insulating resin. A compressor comprising: the compressor motor according to any one of claims 1 to 5; and a compression mechanism that is driven by the compressor motor and compresses refrigerant. A refrigeration cycle apparatus comprising the compressor according to claim 6, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger. The electric motor for a compressor according to any one of claims 2 to 4, wherein the resin has at least one curing property of thermosetting or ultraviolet curing, and after the resin is filled in the storage portion, A method of manufacturing an electric motor for a compressor, wherein the burr is buried in the resin and cured by at least one of heating and ultraviolet irradiation. The method for producing an electric motor for a compressor according to claim 8, wherein the resin has a viscosity of 0.5 Pa · s to 5.0 Pa · s before curing.