JPWO2017134740A1 - Stator and compressor - Google Patents

Abstract

A split iron core having a pivotable connecting portion is connected by a connecting portion, and in a cylindrical stator stator core, a circumferential end of a back yoke (32b) is provided on the split iron core (60, 60A, 60B). The teeth (32c) side has an arc-shaped projection (82) on the other side, and the back yoke (32b) has an arc-shaped hole on the opposite side to the side where the projection (82) is disposed on the circumferential side ( 81), and the connecting portion is fitted into the hole (81) of one divided iron core (60, 60A, 60B) with the projection (82) of another adjacent divided iron core (60, 60A, 60B), The arc-shaped outer peripheral surface (82C) of the protrusion (82) is in contact with and engages with the arc-shaped inner wall (81C) of the hole (81).

Description

  The present invention relates to a stator of a motor for a compressor and a compressor.

  The hermetic compressor includes a compression mechanism unit that compresses refrigerant, an electric mechanism unit that drives the compression mechanism unit, and a sealed container that houses the compression mechanism unit and the electric mechanism unit. The electric mechanism unit includes a rotor and a cylindrical stator provided outside the rotor. The stator is composed of a stator core in which electromagnetic steel plates are laminated and a stator winding. The stator core is composed of a back yoke that forms a cylindrical portion of the outer edge, and teeth that are provided inside the back yoke and wind the stator winding.

  The loss of the electric mechanism part includes an iron loss caused by a magnetic flux loss and a copper loss caused by a current flowing through the stator winding. Copper loss is reduced by using a thick wire for the stator winding and reducing electrical resistance. However, the winding space of the stator needs to be large enough that the winding jig does not come into contact with or interfere with the stator when the winding is wound around the stator. If a wire having a large wire diameter is wound as a stator winding in a state where the winding space of the stator is not sufficient, the necessary number of turns cannot be wound. As a result, the electric mechanism unit cannot generate a necessary torque.

  As a method of expanding the winding space of the stator, for example, there is a method of dividing the stator core. The cylindrical stator core is divided by the back yoke, and the winding is wound around the teeth. Thereafter, the divided stator cores are joined to form one stator core.

As a method of joining the divided stator iron cores, the joints are joined by welding. As a joining method other than welding, for example, as disclosed in Patent Document 1, one of the joint portions of the stator core includes a fitting concave portion and a fitting convex portion on the other, and the fitting concave portion and the fitting convex portion are provided. The cylindrical stator iron core is formed by fitting the parts. Alternatively, as in Patent Document 2, a rectangular locking piece protruding in the stacking direction of the stator core at one of the joint portions of the stator core and a rectangular hole-shaped locking in the stacking direction of the stator core at the other And a locking piece and the locking groove are locked to form a cylindrical stator core. Thereby, the divided stator iron cores can be combined and integrated.
Further, as in Patent Document 3, a convex portion and a concave portion are provided at the back yoke end portion of the divided stator core, and the stator cores divided in advance are pivotally attached to each other by the convex portion and the concave portion. In some cases, the stator cores divided by the rotation support portion are connected while forming the rotation support portion. The divided stator cores are connected and then formed into a cylindrical shape.

JP2011-188650 (7th, 8th pages, FIGS. 1-6) JP2009-118676 (4th, 5th page, FIGS. 7 to 11) JP 2001-95181 (3rd, 4th pages, FIGS. 1-9)

  Unevenness in the rotational speed of the electric mechanism section of the hermetic compressor causes noise generation and efficiency reduction. In order to suppress unevenness in the rotational speed of the electric mechanism, it is preferable that the stator is close to a perfect circular cylinder and the teeth are aligned at equal intervals. However, since the electric mechanism portion is fixed by press-fitting, welding, shrink fitting, or the like when incorporated in the sealed container, the stator is distorted and deformed from a perfect circular cylindrical shape. In particular, when the stator core is divided and formed, distortion occurs at the joint. For example, in the press-fitting, since the hermetic container applies a load to the stator core, parts constituting the stator core try to move in the radial direction and the circumferential direction. Alternatively, due to heating or cooling such as welding, the expansion and contraction of the sealed container places a load on the stator core, and the components constituting the stator core tend to move in the radial direction and the circumferential direction. The same applies to shrink fitting. In this way, the stator of the electric mechanism section is deformed by the load that the components constituting the stator core are about to move in the radial direction and the circumferential direction, generating noise and reducing efficiency.

  When the stator core is divided, welding is performed to join the divided stator cores, so that the stator core is also deformed by the heat.

There is also a method in which the divided stator iron cores are rotatably connected in advance and formed into a cylindrical shape. However, the portion that closes the ring in a cylindrical shape must be welded, and the deformation of the stator core due to the heat cannot be suppressed.
Further, the connecting portion connected so as to be rotatable and the connecting portion by welding are different in rigidity against the load, and further, it is easy to deform from a perfect circle.

  This invention was made in order to solve the above-described problems. A plurality of divided iron cores formed by laminating a plurality of electromagnetic steel sheets are connected in the circumferential direction, and fixed in a cylindrical shape. In the core, the divided stator cores are connected in a cylindrical shape without welding, and the connecting part relaxes the load and stress when incorporated in a sealed container, and suppresses deformation in the radial and circumferential directions. It provides a child iron core.

The stator iron core according to the present invention is formed by laminating a plurality of electromagnetic steel plates, and connects a plurality of back yokes of a divided iron core having teeth and a back yoke in a circumferential direction at a connecting portion of the back yoke, In the stator core configured in a cylindrical shape,
The split iron core has an arc-shaped protrusion on one side of the circumferential end of the back yoke and an arc-shaped hole on the side opposite to the side where the projection is disposed on the other circumferential end of the back yoke. , And
The connecting portion is configured such that the projection of another adjacent split core is fitted into the hole of one split core, and the arc-shaped outer peripheral surface of the projection is in contact with and engages the arc-shaped inner wall of the hole. .

  In the stator core according to the present invention, the connecting portion of the split core is configured so that the arc-shaped outer peripheral surface of the protrusion is in contact with and engages the arc-shaped inner wall of the hole, so that the split core is not welded. It can be connected and rotated at the connecting portion to form a cylindrical shape. And when it incorporates in an airtight container by the connection part, the load and stress concerning a stator core can be relieve | moderated, and a deformation | transformation of the stator core to radial direction and the circumferential direction can be suppressed. Thereby, the speed variation of the rotation speed of the compressor motor can be suppressed, and noise generation and efficiency reduction can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the whole hermetic type compressor in Embodiment 1 of this invention. It is explanatory drawing of the compression mechanism part in Embodiment 1 of this invention. It is explanatory drawing of the freezing circuit in Embodiment 1 of this invention. It is explanatory drawing of the electric mechanism part in Embodiment 1 of this invention. It is explanatory drawing of the split iron core of the stator in Embodiment 1 of this invention. It is explanatory drawing of the stator in Embodiment 1 of this invention. It is assembly explanatory drawing of the stator in Embodiment 1 of this invention. It is assembly explanatory drawing of the stator in Embodiment 1 of this invention. It is the top view and partial enlarged view of an electrical steel sheet which form the division | segmentation iron core in Embodiment 1 of this invention. It is the top view and partial enlarged view of an electrical steel sheet which form the division | segmentation iron core in Embodiment 1 of this invention. It is explanatory drawing of the split iron core in Embodiment 1 of this invention. It is the elements on larger scale of the connection part of the split iron core in Embodiment 1 of this invention. It is the elements on larger scale which show the procedure which connects the division | segmentation iron core in Embodiment 1 of this invention. It is the elements on larger scale which show the procedure which connects the division | segmentation iron core in Embodiment 1 of this invention. It is the elements on larger scale which show the procedure which connects the division | segmentation iron core in Embodiment 1 of this invention. It is the elements on larger scale which show the procedure which connects the division | segmentation iron core in Embodiment 1 of this invention. It is the elements on larger scale which show the procedure which connects the division | segmentation iron core in Embodiment 1 of this invention. It is the elements on larger scale of the other example of the connection part of the split iron core in Embodiment 1 of this invention. It is the elements on larger scale of the division | segmentation iron core in Embodiment 2 of this invention. It is the elements on larger scale of the connection part of the split iron core in Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing the inside of a hermetic rotary compressor according to Embodiment 1 for carrying out the present invention, that is, a view seen from the radial direction of a crankshaft.

  In the hermetic compressor 100, a compression mechanism unit 2 and an electric mechanism unit 3 are accommodated inside the hermetic container 1. The sealed container 1 includes an upper container 11 and a lower container 12. The compression mechanism unit 2 is disposed at the lower part of the sealed container 1, and the electric mechanism unit 3 is disposed at the upper part of the sealed container 1. The compression mechanism unit 2 and the electric mechanism unit 3 are connected by a crankshaft 4. The compression mechanism unit 2 is rotationally driven by the electric mechanism unit 3 via the crankshaft 4. Refrigerating machine oil is stored in the lower portion of the hermetic container 1 and supplied to the sliding portion of the compression mechanism section 2. The refrigerating machine oil is used for lubrication of sliding portions of the compression mechanism section 2 and sealing of gaps.

  The crankshaft 4 includes a main shaft portion 41, a sub shaft portion 42, and an eccentric shaft portion 43. The crankshaft 4 is provided in the axial direction of the crankshaft 4 in the order of the main shaft portion 41, the eccentric shaft portion 43, and the auxiliary shaft portion 42. The center of the axis | shaft of the main axis | shaft part 41 and the subshaft part 42 is provided so that it may correspond, ie, coaxially. The center of the shaft of the eccentric shaft portion 43 is shifted from the center of the shaft of the main shaft portion 41 and the sub shaft portion 42. Accordingly, when the main shaft portion 41 and the sub shaft portion 42 rotate around the center of the shaft, the eccentric shaft portion 43 rotates eccentrically. The crankshaft 4 is rotatably supported by two bearings.

The compression mechanism part 2 is demonstrated in FIG. 1 and FIG.
The compression mechanism unit 2 includes a cylinder 21, a rolling piston 22, a main bearing 23, a sub bearing 24, and a vane 25. The cylinder 21 is provided with a cylindrical internal space, that is, a cylinder chamber 26. Both ends in the axial direction of the cylinder chamber 26 are open to the outside of the cylinder 21. A main bearing 23 is attached to one opening of the cylinder chamber 26. The opening is closed by the main bearing 23. A sub bearing 24 is attached to the other opening of the cylinder chamber 26. And the subbearing 24 has obstruct | occluded the opening part. The main bearing 23 and the auxiliary bearing 24 are fixed to the cylinder 21 with bolts or the like. In the cylinder chamber 26, the eccentric shaft portion 43 of the crankshaft 4, the rolling piston 22, and the vane 25 are accommodated.

FIG. 2 is a cross-sectional view of the compression mechanism section 2 cut along a plane perpendicular to the crankshaft 4.
A vane groove 27 is provided in the cylinder 21 in the radial direction from the center of the cylinder chamber 26. The vane groove 27 opens into the cylinder chamber 26. The vane 25 is stored in the vane groove 27.

  The vane 25 has a substantially rectangular parallelepiped shape. A back pressure chamber 28 is provided on the opposite side of the vane groove 27 from the opening of the cylinder chamber 26. The back pressure chamber 28 is provided with a spring. One of the springs is in contact with the end face of the vane. The vane 25 is pushed out from the vane groove 27 to the cylinder chamber 26 by the spring. The tip of the vane 25 is in contact with and pressed against the outer peripheral surface of the rolling piston 22. Thereby, the space formed by the inner peripheral surface of the inner diameter of the cylinder chamber 26, the outer peripheral surface of the outer diameter of the rolling piston 22, the main bearing 23, and the auxiliary bearing 24 is divided into two working chambers by the vanes 25. It is divided into.

The rolling piston 22 has a ring shape and is rotatably mounted on the eccentric shaft portion 43. The rolling piston 22 rotates eccentrically in the cylinder chamber 26 together with the eccentric shaft portion 43 as the crankshaft 4 rotates. As a result, the vane 25 in contact with the rolling piston 22 reciprocates in the vane groove 27.
Although the rolling piston 22 and the vane 25 have been described as separate members, they may be integrated and the operation is almost the same.

  Both the main bearing 23 and the sub-bearing 24 are composed of a cylindrical bearing portion and a flat end plate portion orthogonal to the bearing portion. The main shaft portion 41 of the crankshaft 4 is inserted into the bearing portion of the main bearing 23. The bearing portion of the main bearing 23 supports the main shaft portion 41. The auxiliary shaft portion 42 of the crankshaft 4 is inserted into the bearing portion of the auxiliary bearing 24. The bearing portion of the auxiliary bearing 24 supports the auxiliary shaft portion 42. One end of the cylinder chamber 26 is closed by the end plate of the main bearing 23. The other opening of the cylinder chamber 26 is closed by the end plate portion of the auxiliary bearing 24.

  The cylinder 21 is provided with a flow path that communicates with the outside of the sealed container 1 and the cylinder chamber 26, that is, a suction port. Generally, the suction port is a hole provided in the cylinder 21. The suction port communicates with one working chamber in which the cylinder chamber 26 is divided by the vane 25. The cylinder 21 sucks refrigerant gas from the outside of the hermetic container 1 into one working chamber through the suction port.

  The cylinder 21 is provided with a flow path that communicates with the outside of the cylinder 21 and the cylinder chamber 26, that is, a discharge port. Generally, the discharge port is also a hole provided in the cylinder 21. The discharge port communicates with the other working chamber in which the cylinder chamber 26 is divided by the vane 25. The main bearing 23 is provided with a flow path and an opening that communicate with the discharge port, that is, a discharge port. The discharge port communicates the working chamber of the cylinder 21 and the external space of the cylinder 21 via the discharge port. A discharge valve is provided at the discharge port. The discharge valve closes until the refrigerant in the working chamber reaches a predetermined pressure, and opens when the refrigerant in the working chamber reaches a predetermined pressure or more.

  The main bearing 23 is provided with a discharge muffler 29 that covers the main bearing 23. The discharge muffler 29 is attached to the main bearing 23 with bolts or the like. A space, that is, a muffler chamber is provided between the main bearing 23 and the discharge muffler 29. The refrigerant gas discharged from the discharge port of the main bearing 23 diffuses into the muffler chamber. Discharge noise is suppressed by once diffusing the refrigerant gas compressed in the cylinder 21 into the muffler chamber. When the discharge port is in the auxiliary bearing 24, the discharge muffler 29 is also provided in the auxiliary bearing 24. Further, when both have discharge ports, they are provided on both the main bearing 23 and the auxiliary bearing 24.

  The discharge muffler 29 is provided with an opening 30. The opening 30 communicates the muffler chamber and the space between the discharge muffler 29 and the sealed container 1. Thereby, the refrigerant gas compressed in the cylinder chamber 26 is discharged into the sealed container 1 through the discharge muffler 29.

  The refrigerant gas discharged from the discharge muffler 29 into the sealed container 1 is sent above the sealed container 1. At that time, the refrigerant gas passes through the gap of the electric mechanism unit 2. A discharge pipe 5 is provided in the upper container 11 of the sealed container 1. A refrigerant circuit provided outside the sealed container 1 is connected to the discharge pipe 5. The refrigerant gas compressed by the compression mechanism unit 3 is discharged from the discharge pipe 5 to the refrigerant circuit outside the sealed container 1.

  A suction muffler 101 is provided outside the sealed container 1. The suction muffler 101 and the suction port of the cylinder 21 are connected by a suction pipe 6. The suction muffler 101 is connected to a refrigerant circuit provided outside the sealed container 1 via a pipe 102. The suction muffler 101 is hollow inside. The hollow space communicates with the pipe 102 and the suction pipe 6. The refrigerant gas sucked from the pipe 102 is diffused into the hollow space of the suction muffler 101, and only the refrigerant gas is sucked into the cylinder 21 from the suction pipe 6. Thereby, the liquid refrigerant is separated from the refrigerant gas, and only the refrigerant gas is sucked into the cylinder 21.

When the hermetic compressor 100 is applied to an air conditioner, a condenser 103, an expansion valve 104, and an evaporator 105 are provided outside the hermetic compressor 100 to form a refrigeration circuit. It is shown in FIG. That is, in the air conditioner, the discharge pipe 5 of the hermetic compressor 100 is connected to the suction muffler 101 through the condenser 103, the expansion valve 104, and the evaporator 105. The discharge pipe 5, the condenser 103, the expansion valve 104, the evaporator 105, and the suction muffler 101 are connected by piping. The pipe is a copper pipe. The refrigerant circulates in this circuit. In the condenser 103 and the evaporator 105, the refrigerant exchanges heat with air, water, etc., and performs heat absorption and heat dissipation. That is, the refrigerant that has absorbed heat in the evaporator 105 is carried to the condenser 103 and is radiated by the condenser 103. The refrigerant radiated by the condenser 103 is carried to the evaporator 105 and again absorbs heat. By circulating in the circuit in this way, heat energy is conveyed.
Reference numeral 106 denotes a four-way valve that reverses the route through which the refrigerant circulates. That is, the refrigerant discharged from the hermetic compressor 100 flows in the order of the condenser 103, the expansion valve 104, the evaporator 105, and the suction muffler 101, and returns to the hermetic compressor 100 by the four-way valve 106. The refrigerant discharged from the machine 100 is switched so as to flow in the order of the evaporator 105, the expansion valve 104, the condenser 103, and the suction muffler 101 and return to the hermetic compressor 100. In the air conditioner, the conveyance of heat energy is reversed to switch between cooling and heating. When the forward path is reversed, the function of the condenser 103 is an evaporator, and the function of the evaporator 105 is a condenser.

Next, the operation of the compression mechanism unit 2 will be described.
First, low-pressure and low-temperature refrigerant gas is sucked into a working chamber communicating with the suction port. The working chamber that has sucked the refrigerant gas moves in the cylinder chamber 26 by the eccentric rotation of the rolling piston 22, that is, the eccentric shaft portion 43, and is disconnected from the suction port. Further, as the rolling piston 22 rotates eccentrically, the volume of the working chamber is reduced and the sucked refrigerant gas is compressed. As the eccentric rotation of the rolling piston 22 proceeds, the working chamber communicates with the discharge port. When the working chamber communicates with the discharge port and the refrigerant gas reaches a predetermined pressure, the discharge valve that closes the discharge port opens. When the discharge port is opened, the high-pressure and high-temperature refrigerant gas in the working chamber is discharged into the discharge muffler 29 through the discharge port. The refrigerant gas discharged into the discharge muffler 29 is discharged from the discharge muffler 29 into the sealed container 1. When the rolling piston 22 rotates eccentrically, the communication with the discharge port is cut off and the communication with the suction port is made again. A series of operations are performed while the rolling piston 22 makes one rotation in the cylinder chamber 26. Of the two working chambers provided by the vane 25, when one working chamber is sucking the refrigerant gas, the other is an operation of discharging the refrigerant gas. Therefore, the working chamber has the vane 25 in between, the working chamber in which the suction port communicates and sucks the low-pressure refrigerant gas is the suction chamber in the low-pressure space, and the working chamber in which the discharge port communicates and discharges the high-pressure refrigerant gas is It becomes a compression chamber of high-pressure space.

Next, the electric mechanism unit 3 will be described with reference to FIGS. 1 and 4. The rotational force of the rolling piston 22, that is, the crankshaft 4 is obtained from the electric mechanism unit 3.
The electric mechanism unit 3 includes a rotor 31 and a stator 32 provided so as to surround the outside of the rotor 31.

  The rotor 31 has a cylindrical shape and is fixed to the main shaft portion 41 of the crankshaft 4. The rotor 31 is composed of a rotor core 31a. The rotor core 31 a is formed by stacking thin electromagnetic steel plates in the axial direction of the crankshaft 4. The electromagnetic steel sheet has a thickness of 0.1 mm to 1.5 mm. Electrical steel sheets are mainly made of iron. The rotor core 31a is formed by punching the electromagnetic steel sheets into a certain shape and stacking a plurality of them in the axial direction. Stacked electrical steel sheets are fixed by caulking or welding.

  An upper balance weight 31b is provided at the upper part of the rotor core 31a, and a lower balance weight 31c is provided at the lower part. The upper balance weight 31b and the lower balance weight 31c are provided to cancel the load when the eccentric shaft portion 43 of the crankshaft 4 rotates eccentrically. The upper balance weight 31b, the lower balance weight 31c, and the rotor core 31a are fixed by rivets 31d. The rotor core 31a is provided with a rivet hole penetrating in the axial direction. The upper balance weight 31b and the lower balance weight 31c are also provided with rivet holes. A rivet 31d is inserted into these rivet holes and fixed. Note that when the eccentric shaft portion 43 of the crankshaft 4 is eccentrically rotated and the load does not need to be canceled, end plates are attached instead of the upper balance weight 31b and the lower balance weight 31c. .

  The rotor 31 is provided with a shaft hole penetrating in the axial direction on the central axis of the rotor 31. The main shaft portion 41 of the crankshaft 4 is inserted and fixed in the shaft hole of the rotor 31.

  The rotor 31 has a different structure depending on the type of the electric mechanism unit 3. For example, a DC motor has a permanent magnet, and an AC motor has a secondary winding. 1 and 4 are examples of DC motors.

FIG. 4 is a cross-sectional view of the electric mechanism unit 3 cut along a plane perpendicular to the crankshaft 4.
In the case of a DC motor, the rotor 31 is provided with a magnet hole penetrating in the axial direction so as to surround the shaft hole. A permanent magnet 31e is inserted and fixed in the magnet hole. In general, an even number of magnet holes and permanent magnets 31e are provided. Further, the magnet hole and the permanent magnet 31 e are provided in the outer peripheral portion of the rotor 31 in the radial direction, that is, in the vicinity of the outer peripheral surface of the rotor 31 in the radial direction. A ferrite magnet or a rare earth magnet is used for the permanent magnet 31e. The magnet shape includes an arc shape, a flat plate shape and the like according to the characteristics of the material. Moreover, although the thing of the structure which has a magnet hole has been demonstrated, there exists a thing of the structure where the magnet was adhere | attached and fixed to the outer peripheral surface of the radial direction of the rotor 31. FIG.
The rotor 31 of the DC motor generates magnetic flux by the permanent magnet 31e.

Although not shown, in the case of an AC motor, a secondary winding is provided on the stator. The secondary winding includes a plurality of columnar conductive materials penetrating in the axial direction and a ring-shaped conductive material that connects the plurality of conductive materials at the end surfaces in the axial direction. The columnar conductive material and the ring-shaped conductive material are integrally formed of aluminum. The generated secondary winding is shaped like a ridge. The upper balance weight 31b and the lower balance weight 31c are fixed to the end face of the ring-shaped conductive portion.
The rotor of the AC motor generates magnetic flux by the induced current generated in the secondary winding.

  In any case, the rotor 31 rotates around the central axis, that is, the crankshaft 4 by the magnetic flux generated by the stator 32 and the magnetic flux generated by the rotor 31.

  In the case of the electric mechanism portion 3 for the compressor, a communication hole 31f penetrating in the axial direction is provided between the magnet hole and the shaft hole or between the secondary winding and the shaft hole. The refrigerant gas discharged from the discharge muffler 29 is guided to the discharge pipe 5 by using the gap between the rotor 31 and the stator 32, the gap between the windings of the stator 32, and the communication hole 31f.

  The refrigerant gas discharged from the compression mechanism unit 2 contains and dissolves refrigerating machine oil stored in the lower portion of the sealed container 1. If the refrigerating machine oil is discharged out of the sealed container 1 while being dissolved in the refrigerant gas, the refrigerating machine oil in the sealed container 1 is depleted and the refrigerating machine oil is not supplied to the compression mechanism unit 2. If the refrigerating machine oil is not supplied to the compression mechanism part 2, the gap in the compression mechanism part 2 is insufficiently sealed, the refrigerant gas leaks, the lubricity of the sliding part of the compression mechanism part 2 decreases, and a failure occurs. Or Therefore, refrigeration oil is separated from the refrigerant gas and returned to the lower part of the sealed container.

  As shown in FIG. 1, an oil separation plate 31 g is provided between the opening of the communication hole 31 f and the discharge pipe 5. The oil separation plate 31g is fixed to the crankshaft 4. A shaft hole is provided at the center of the oil separation plate 31g. The main shaft portion 41 of the crankshaft 4 is inserted and fixed in the shaft hole. The oil separation plate 31g is a flat plate and generally has a disk shape. However, it may be rectangular or polygonal. The disc-shaped portion of the oil separation plate 31g is projected and fixed so as to cover the upper part in the axial direction of the opening of the communication hole 31f. The refrigerant gas sucked from one of the communication holes 31f is discharged from the other and collides with the oil separation plate 31g.

  Since the gaps other than the communication holes 31f are narrow, the refrigerant gas passing through the gaps has a slower flow velocity than the communication holes 31f. Therefore, the refrigerant gas and the refrigerating machine oil are separated while passing through the gap. On the other hand, the refrigerant gas passing through the communication hole 31f has a higher flow velocity than the gaps other than the communication hole 31f. Therefore, it passes through the communication hole 31f before being separated into the refrigerant gas and the refrigerating machine oil. The refrigerant gas is discharged from the communication hole 31f. When the refrigerant gas is sent out from the discharge pipe 5 as it is, the refrigerating machine oil is taken out of the sealed container 1. However, the refrigerant gas discharged from the communication hole 31f collides with the oil separation plate 31g. The refrigerant gas is separated into refrigerant gas and refrigerating machine oil by colliding with the oil separation plate 31g. When separated, the refrigerant gas having a low specific gravity flows upward, and the refrigerating machine oil having a high specific gravity is returned downward. By such an operation, the oil separation plate 31g suppresses the amount that the refrigerating machine oil is taken out of the sealed container 1.

  As shown in FIG. 4, the stator 32 is entirely cylindrical, and the rotor 31 is provided inside. The rotor 31 and the stator 32 are installed through a gap of 0.3 mm to 1.0 mm. Like the rotor 31, the stator 32 includes a stator core 32 a in which thin electromagnetic steel plates are stacked in the axial direction of the crankshaft 4.

  The stator core 32a includes a back yoke 32b that forms a cylindrical portion of the outer edge, and a plurality of teeth 32c provided inside the back yoke 32b. The teeth 32c extend toward the central axis of the stator core 32a, that is, toward the crankshaft 4. The tip extends in an inverted arc shape so as to face the outer peripheral surface of the rotor. A slot 32e occupied by the stator winding 32d is formed between the teeth 32c and the teeth 32c.

  A stator winding 32d is wound around the tooth 32c via an insulating member 32f. Note that there are a concentrated winding method and a distributed winding method for winding the stator winding 32d. The concentrated winding method is a configuration and method in which the stator winding 32d is wound around each tooth 32c. One magnetic pole is formed on one tooth 32c. Distributed winding is a configuration and method in which the stator winding 32d is wound over a plurality of teeth 32c. A plurality of teeth 32c form one magnetic pole. The method shown in FIG. 4 is a concentrated winding method. The concentrated winding method will be described as an example.

  The stator winding 32d is composed of a core wire and at least one layer of a coating covering the core wire. The material of the core wire is mainly copper, but may be aluminum. The material of the coating is AI (amidoimide) / EI (ester imide). The stator 32 generates a magnetic flux for each tooth 32c by passing a current through the stator winding 32d.

  The insulating member 32f insulates the stator core 32a mainly made of iron from the stator winding 32d made of copper. Between the stator core 32a and the stator winding 32d, a refrigerant having a lower dielectric constant than that in vacuum or refrigeration oil passes, so that the dielectric constant therebetween decreases. As the density of the refrigerant increases, the dielectric constant decreases. The decrease in dielectric constant causes an increase in leakage current when a current is passed through the stator winding 32d. Therefore, an insulating member 32f is disposed between the stator core 32a and the stator winding 32d. The insulating member 32f is made of PET (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PTFE. (Polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), or a phenol resin is used.

  The insulating member 32f in the slot 32e may use a film material. The cross-sectional area in the axial direction of the slot 32e is limited. On the other hand, in order to reduce the electrical resistance of the stator winding 32d and increase the efficiency of the electric mechanism unit 3, it is necessary to increase the wire diameter of the stator winding 32d and increase the cross-sectional area. Therefore, when trying to pass as much of the stator winding 32d having a large wire diameter as possible through the axial cross-sectional area of the slot 32e, it is advantageous that the thickness of the insulating member 32f is thin. A film material that can be made thinner than the insulating member 32f is used. As the film material, an insulating film made of a low oligomer film such as PET (polyethylene terephthalate) or PPS (polyphenylene sulfide) with a small amount of extracted oligomer is used. An oligomer refers to a polymer having a relatively low molecular weight to which a finite number of monomers (generally 10 to 100) are bonded. The amount of the oligomer extracted by the chloroform extraction amount for 20 hours of the insulating film is preferably 1.5% or less. The thickness of the insulating film is desirably 0.2 mm or less.

The insulating member 32f is provided with a restraining portion that restrains the end of the stator winding 32d. In a state where the insulating member 32f is mounted on the stator core 32a, the restraining portion is disposed on the end surface in the axial direction. The same number of restraining portions as the teeth 32c are provided, and are arranged on the end face in the axial direction of the back yoke 32b connected to the teeth 32c. A restraining groove is provided in the restraining portion. One end of the stator winding 32d wound around the teeth 32c is restrained in the restraining groove. The other end of the stator winding 32d is restrained by a restraining groove of a restraining portion different from the restraining portion where one of the ends of the stator winding 32d is restrained. In this manner, the stator winding 32d wound around the teeth 32c is temporarily locked to the restraining portion.
In addition to the end of the stator winding 32d, the connecting wire and the lead wire 33 are also restrained in the restraining groove of the restraining portion. A pressure contact terminal is incorporated in the restraining portion. The pressure contact terminal is also provided with a groove, and the groove sandwiches each line. The press contact terminal is made of a conductive metal such as brass. Then, the stator winding 32d, the jumper wire, and the lead wire 33 are electrically connected. That is, the stator winding 32d is connected to the jumper wire and the lead wire 33 via the restraint portion and the press contact terminal incorporated in the restraint portion.

  The jumper wire connects one stator winding 32d and another stator winding 32d. For example, in the case of a three-phase motor, three groups (phases) of windings are made. When there are six teeth portions 32c, two windings form one group. A jumper wire connects the stator windings 32d. In addition, one of the windings constituting the three groups is connected to the power source via the lead wire 33, and the other one is coupled to form a neutral point. In that case, a crossover is used.

  The lead wire 33 is connected to a terminal connected to a power supply outside the sealed container 1. A terminal 34 is provided on the upper container 11 of the sealed container 1. The lead wire 33 is connected to the terminal 34. The terminal 34 may be provided in the lower container 12.

  The terminal 34 is connected to a power source provided outside the hermetic compressor, for example, an inverter device. The electric mechanism unit 3 is energized from this power source, and the electric mechanism unit 3 operates. That is, the stator 32 generates a magnetic flux, and the rotor 31 performs a rotational motion. Then, the compression mechanism unit 2 is driven via the crankshaft 4.

The electric mechanism unit 3 is configured in this way. However, since the stator 32 has a structure in which the teeth 32c are extended toward the central axis, the space for winding the stator winding 32d and the winding jig do not contact or interfere with the stator. There is not enough space to do it. As a solution, there is a manufacturing method using a split core for the stator core 32a.
A manufacturing method using a split core is a method in which a cylindrical stator core is divided by a back yoke, a stator winding is wound around a tooth, and then the back yoke is joined to form a cylindrical shape. is there. The number of divisions is not limited to the number of teeth and can be any number.

The structure of the split core of the stator core 32a will be described with reference to FIG.
5 is a view seen from a direction corresponding to the axial direction when assembled into a cylindrical stator core 32a. The axial direction is the rotational axis of the rotor 31, that is, the axial direction of the crankshaft 4 when the stator core 32 a is assembled as the electric mechanism unit 3. The split iron core 60 has a T-shape and includes one tooth 32c and a back yoke 32b connected to the tooth 32c. The back yoke 32b has an arc shape. The teeth 32c are provided at a substantially right angle to the back yoke 32b in the center of the back yoke 32b. The teeth 32c are provided extending toward the center of the arc shape of the back yoke 32b. When the split iron core 60 is assembled to the stator iron core 32a, the back yoke 32b is annular or cylindrical, and the teeth 32c face the center of the ring. The tip of the teeth 32 c, that is, the portion of the teeth 32 c on the side opposite to the back yoke 32 b is a surface facing the rotor 31. The surface has a shape that spreads in a reverse arc shape along the outer peripheral surface of the rotor 31. Further, the back yoke 32b constitutes a cylindrical outer peripheral portion of the stator iron core 32a. Therefore, the part which contacts the airtight container 1 mentioned later is the back yoke 32b.

  When the divided iron core 60 is formed, the thin steel sheets are superposed and caulked in the superposition direction to fix the magnetic steel sheets. 61 is caulking.

  An insulating member 32 f is fixed to the axial end surface of the split iron core 60. The insulating member 32 f is provided with a protrusion that is engaged with the split iron core 60. A hole 62 is provided in the end surface of the split iron core 60 in the axial direction. The protrusion provided on the insulating member 32f is inserted into the hole 62 of the split iron core 60 and locked.

  The split iron core 60 has end surfaces 63 and 64 of the back yoke 32b in a direction perpendicular to the teeth 32c, that is, in the circumferential direction of the back yoke 32b. After the winding is wound around the teeth 32c, the split core 60 is welded at the end surfaces 63 and 64 of the back yoke 32b to join the split cores 60 together.

However, since the stator core 32a connects a plurality of split cores 60, there are many operations and processes such as arranging the split cores 60 around which the stator windings 32d are wound in an annular shape. Moreover, when it arranges in cyclic | annular form, the division | segmentation iron core 60 often shifts | deviates to radial direction. The work of aligning in an annular shape requires very advanced techniques.
Therefore, there is a method of winding the stator winding 32d after connecting the split iron core 60 in advance.

  FIG. 6 shows an iron core in which divided iron cores are connected and aligned in a row. The split iron core 60 extends a part of the electromagnetic steel sheet constituting the back yoke 32b in the circumferential direction so that it can be overlapped with a part of the electromagnetic steel sheet of the back yoke 32b of the adjacent split iron core. The overlapping portion hits a rivet or the like in the stacking direction of the electromagnetic steel sheets and engages so as to be rotatable. Thereby, adjacent division | segmentation iron cores can be connected. The engaging portion becomes the connecting portion 65. When the connected divided iron core 60 is rotated about the connecting portion 65, the end surfaces 63 and 64 of the back yoke 32b are brought into contact with or pressed to stop the rotation.

  When winding the stator winding 32d, as shown in FIG. 6, the stator winding 32d is wound around the teeth 32c with the divided cores 60 aligned in a line. Thereby, the stator winding 32d can be wound without causing contact or interference with the stator of the winding jig. After the stator winding 32d is wound around the teeth 32c, the stator core 32a is rotated about each connecting portion 65 as shown in FIG. 7 to form the split core 60 in an annular shape. The last joint surfaces 66A and 66B for closing the ring are joined by welding. An insulating member 32 f is attached to the split iron core 60. Since the insulating member 32f is disposed on the end surface of the split iron core 60 in the stacking direction of the electromagnetic steel plates, the insulating member 32f is also disposed on the end surface of the connecting portion in the stacking direction of the electromagnetic steel plates. Therefore, since the insulating member 32f closes the direction in which the rivet is inserted into the connecting portion, it is difficult to join the rivet or the like in the stacking direction of the electromagnetic steel sheets after winding the stator winding 32d. Therefore, it is common to join by welding.

FIG. 8 shows a state of the stator core 32a in which the divided cores 60 are joined, and is formed in an annular shape.
An annularly formed stator core 32 a is press-fitted into the hermetic container 1. Thereafter, the stator core 32a is welded to the sealed container 1 and fixed. That is, the stator core 32 a is fixed to the inner wall of the sealed container 1. In addition, the protrusion is provided in the outer peripheral surface of the outer diameter of the stator core 32a. The protrusion and the inner wall of the sealed container 1 come into contact with each other and are fixed. Therefore, a gap is provided between the inner wall of the sealed container 1 and the outer peripheral surface of the outer diameter of the stator core 32a. Thereby, the influence of the deformation | transformation of the airtight container 1 is relieve | moderated.

  Unevenness of the rotational speed of the electric mechanism unit 3 causes noise generation and efficiency reduction. In order to suppress the speed unevenness in the rotational speed of the electric mechanism section 3, it is preferable that the stator core 32a has a cross section perpendicular to the axial direction close to a perfect circle and the teeth 32c are aligned at equal intervals. However, since the stator core 32a connects the split cores 60 by welding, deformation due to thermal action occurs. Furthermore, when fixed to the sealed container 1, the stator core 32a is deformed by a load generated by press fitting, welding, shrink fitting, or the like. For example, when the stator 32 is press-fitted into the sealed container 1, the stator core 32 a receives a tightening load by the sealed container 1. Even when the stator 32 is welded to the sealed container 1, the stator core 32 a receives a load due to thermal expansion and contraction of the sealed container 1. The same applies to shrink fitting. In the compressor, since the high-pressure and high-temperature refrigerant gas passes through the electric mechanism unit 3, the hermetic container 1 and the electric mechanism unit 3 are also subjected to the thermal action, and the stator core 32a receives a load. Due to these loads, the split core 60 tends to move in the radial direction and the circumferential direction, causing distortion and deformation, and the stator core 32a is deformed from a perfect circle.

  Even when the split iron cores are connected in advance, the joint 66 is welded, so that it is deformed from a perfect circle by its thermal action. Further, in the stator core 32a in which the divided iron cores are connected in advance, the connecting portion 65 and the joint portion 66 are deformed or distorted due to the difference in rigidity. The connecting portion 65 can move, but the joint portion 66 cannot move. Therefore, if a load is applied to the stator core 32a, the split core 60 tries to move in the radial direction and the circumferential direction, and the stator core 32a starts from a perfect circle. Deform.

  Therefore, in the present embodiment, all the joint portions of the split iron cores are connected by a rotatable connecting portion without welding, and the load when the stator core 32a is incorporated in the sealed container 1 in the connecting portion. And a structure that relieves stress. That is, even if the insulating member 32f blocks the direction in which the rivet is inserted into the connecting portion, the connecting portion can be connected. 9, 10, 11, and 12 explain the details of the connecting structure.

It demonstrates from the structure of the electromagnetic steel plate of the division | segmentation iron core 60 in a figure.
The split iron core 60 is configured by stacking a first type of electromagnetic steel plate 71 and a second type of electromagnetic steel plate 72. That is, it is laminated in the axial direction when the stator core 32a is formed. The first type of electromagnetic steel sheet 71 and the second type of electromagnetic steel sheet 72 are T-shaped in a plan view as viewed from the perpendicular direction, that is, the stacking direction with respect to the electromagnetic steel sheet. Each of them is composed of a split iron core 60, a part that forms an arcuate back yoke 32b, and a part that forms a tooth 32c provided substantially at a right angle in the center of the back yoke 32b. The split iron core 60 has a structure in which first-type electromagnetic steel plates 71 and second-type electromagnetic steel plates 72 are alternately stacked and arranged.
FIG. 9 shows the overall shape of the first type of electromagnetic steel sheet 71 and also shows an enlarged connection portion of the first type of electromagnetic steel sheet 71. The third stage of the fourth stage in FIG. 9 is a plan view of the entire first type of electrical steel sheet 71 as viewed from the direction perpendicular to the electrical steel sheet, and the fourth stage is the first type. The cross section which cut | disconnected the back yoke part of the electromagnetic steel plate 71 in the circumferential direction of the back yoke and the orthogonal | vertical direction with respect to the electromagnetic steel plate is represented. The second level is an enlarged view of the connecting portion of the first type of electrical steel sheet 71, as viewed from the vertical direction with respect to the electrical steel sheet, and the first level is an enlarged part of the second level. Is a cross-sectional view taken along the circumferential direction of the back yoke and perpendicular to the electromagnetic steel sheet.
FIG. 10 shows the overall shape of the second type of electromagnetic steel sheet 72 and also shows an enlarged connection portion of the second type of electromagnetic steel sheet 72. FIG. 10 is also similar to FIG. 9, the third of the four stages is a plan view of the entire second-type electromagnetic steel sheet 72 as viewed from the direction perpendicular to the electromagnetic steel sheet. The cross section which cut | disconnected the back yoke part of the 2nd type | mold electromagnetic steel plate 72 in the circumferential direction of the back yoke and the orthogonal | vertical direction with respect to the magnetic steel plate is represented. The second stage is an enlarged view of the connecting part of the second type of electrical steel sheet 72, as viewed in a plane perpendicular to the electrical steel sheet, and the first stage is an enlarged part of the second stage. Is a cross-sectional view taken along the circumferential direction of the back yoke and perpendicular to the electromagnetic steel sheet.
FIG. 11 shows a state where the first type of electromagnetic steel plate 71 and the second type of electromagnetic steel plate 72 are stacked, and shows the entire divided iron core. The upper part of FIG. 11 is a plan view of the entire divided iron core as viewed from the vertical direction with respect to the magnetic steel sheet, and the lower part shows the back yoke of the divided iron core in the circumferential direction of the back yoke and in the vertical direction with respect to the magnetic steel sheet. The cross section cut | disconnected by is represented. For the sake of convenience of explanation, the cross section represents only one stack of the first type of electromagnetic steel sheet 71 and one second type of electromagnetic steel sheet 72, and the divided iron core includes a plurality of sheets of each electromagnetic steel sheet. , Stacked and configured.
FIG. 12 shows a connecting portion of the first type electromagnetic steel plate 71 and the second type electromagnetic steel plate 72 in any continuous four layers L1 to L4 of the split iron core. FIG. 12 is a plan view as viewed from the vertical direction with respect to the electromagnetic steel sheet, similar to the enlarged portion of FIGS. Although it is desirable that the number of laminations of the first-type electromagnetic steel plate 71 and the second-type electromagnetic steel plate 72 is more than four, only four layers L1 to L4 are shown here for convenience of explanation. .
9, 10, 11, and 12 show the first type of electromagnetic steel plate 71, the second type of electromagnetic steel plate 72, and the laminate thereof of the adjacent split cores. For the sake of convenience, in the figure, the left iron steel plates (71, 72) are laminated and the left divided iron core is formed on the left side, and the first divided iron core 60A and the right electromagnetic steel plates (71, 72) are laminated on the right side. The divided iron core will be described as a second divided iron core 60B. Further, the right-side enlarged portion of the first type of electromagnetic steel plate 71 will be described as an electromagnetic steel plate 73, and the right-side enlarged portion of the second type of electromagnetic steel plate 72 will be described as an electromagnetic steel plate 74. Similarly, the left side enlarged portion of the second type electromagnetic steel plate 72 will be described as the electromagnetic steel plate 75, and the left side enlarged portion of the first type electromagnetic steel plate 71 will be described as the electromagnetic steel plate 76. Accordingly, in the drawing, the component arranged on the left side of the enlarged view is a partial enlarged view of the right end of the back yoke 32b of the first divided iron core 60A, and the component arranged on the right side of the enlarged view is the second divided iron core. It is the elements on larger scale of the left end part of the back yoke 32b of 60B. 60A of 1st division | segmentation iron cores and the 2nd division | segmentation iron core 60B are distinction for convenience of explanation, and are the adjacent division | segmentation iron cores of the same type.

  The electromagnetic steel plate 73 includes a laminated portion 3A that overlaps with the electromagnetic steel plate 74 and a protruding portion 3B that protrudes outward from the electromagnetic steel plate 74 in the circumferential direction of the back yoke 32b. The hole 81 is provided in the protruding portion 3B that protrudes. When the split core 60A and the split core 60B are connected, the end 3C that protrudes outward in the circumferential direction of the back yoke 32b from the electromagnetic steel plate 74 of the electromagnetic steel plate 73 of the split core 60A is connected. Adjacent to the end 6C of the 60B electromagnetic steel sheet 76.

  The hole 81 of the electromagnetic steel sheet 73 has a fan-shaped cross section perpendicular to the electromagnetic steel sheet 73. The inner wall 81A on the inner peripheral side of the arc-shaped back yoke 32b of the hole 81 and the inner wall 81B on the outer peripheral side of the arc-shaped back yoke 32b of the hole 81 constitute a fan-shaped linear portion. That is, it is a linear surface in a plan view as viewed from the vertical direction with respect to the electromagnetic steel sheet 73. The inner wall 81 </ b> C on the end 3 </ b> C side of the hole 81 forms a fan-shaped arc portion. That is, it is an arc-shaped surface in a plan view as viewed from the vertical direction with respect to the electromagnetic steel sheet 73. The end 3C side is the side opposite to the side on which the electromagnetic steel plates 74 are stacked. The inner wall on the side opposite to the end 3 </ b> C of the hole 81, that is, on the electromagnetic steel sheet 74 side may have an arbitrary shape. In this Embodiment, the inner wall is comprised by the circular arc-shaped surface by the planar view seen from the perpendicular direction with respect to the electromagnetic steel plate 73. FIG.

  The electromagnetic steel plate 75 has a laminated portion 5A that overlaps the electromagnetic steel plate 76 and a protruding portion 5B that protrudes outward in the circumferential direction of the back yoke 32b from the electromagnetic steel plate 76. The protrusion 82 is provided on the protruding portion 5B. When the split core 60A and the split core 60B are connected, the end 5C that protrudes outward in the circumferential direction of the back yoke 32b rather than the electromagnetic steel plate 76 of the electromagnetic steel plate 75 of the split core 60B is connected. Adjacent to the end 4C of the 60A electromagnetic steel plate 74.

The protrusion 82 of the electromagnetic steel sheet 75 protrudes in a direction in which the electromagnetic steel sheets are stacked, that is, in a direction perpendicular to the electromagnetic steel sheet 75 and has elasticity. The protrusion 82 has a shape in which the electromagnetic steel plate 76 side protrudes from the electromagnetic steel plate 74 side. That is, there is an inclination in the direction of the electromagnetic steel plate 76 from the electromagnetic steel plate 74 side. An outer peripheral surface 82A on the inner peripheral side of the arc-shaped back yoke 32b of the protrusion 82 and an outer peripheral surface 82B on the outer peripheral side of the arc-shaped back yoke 32b of the protrusion 82 are opposed to each other and are substantially parallel surfaces. And it is a linear surface in the planar view seen from the perpendicular direction with respect to the electromagnetic steel sheet 75. The outer peripheral surface 82 </ b> C on the side where the magnetic steel sheets 76 of the protrusions 82 are stacked has an arc shape in a plan view as viewed from the vertical direction with respect to the third magnetic steel sheet 75. The side on which the electromagnetic steel plates 76 are stacked is the side on which the teeth 32c are disposed.
Therefore, the outer peripheral surface 82C of the protrusion 82 is the outer peripheral surface on the side where the hole 81 is disposed, and the inner wall 81C of the hole 81 is the inner wall on the opposite side to the side where the protrusion 82 is disposed.
The arc shape of the outer peripheral surface 82C of the protrusion 82 is an arc shape having the same radius and the same shape as the inner wall 81C of the hole 81. That is, the arc-shaped radius of the outer peripheral surface 82 </ b> C of the protrusion 82 matches the arc-shaped radius of the inner wall 81 </ b> C of the hole 81. The protrusion 82 may be formed by an arbitrary method, but in the present embodiment, the protrusion 82 is formed by cutting and raising a part of the electromagnetic steel sheet 75.

  With the above configuration, the split iron core 60A includes the hole 81 at one end of the back yoke 32b. The split iron core 60B includes a protrusion 82 at one end of the back yoke 32b. Since the divided iron cores 60A and 60B are distinguished for convenience of explanation, the divided iron cores 60A and 60B, that is, the divided iron core 60 includes a hole 81 at one end of the back yoke 32b, and a protrusion 82 at the other end. It is the structure provided with.

  When the divided iron core 60 </ b> A and the divided iron core 60 </ b> B are connected, the projection 82 of the electromagnetic steel plate 72 is fitted in the hole 81 of the electromagnetic steel plate 71. Thereby, at least in the direction in which the protrusions 82 protrude, the divided iron cores 60 are engaged with each other by the same number of protrusions 82 as the number of the electromagnetic steel plates 72. Therefore, the greater the number of protrusions 82, the stronger the engaging force between the divided iron cores 60. By fitting the protrusions 82 into the holes 81, a connecting portion between the split iron core 60A and the split iron core 60B is configured.

The shape of the hole 81 and the shape of the protrusion 82 will be described.
If the fan-shaped center of the hole 81 is P, the center P is closer to the electromagnetic steel sheet 74 than the hole 81. An inner wall 81 </ b> C of the hole 81 is formed in an arc shape centered on P. The outer peripheral surface 82 </ b> C of the protrusion 82 is formed in an arc shape drawn with the same radius as the center P to the inner wall 81 </ b> C of the hole 81. When the protrusion 82 is fitted into the hole 81, the outer peripheral surface 82 </ b> C of the protrusion 82 is arranged in an arc shape centered on P. That is, the outer peripheral surface 82C of the protrusion 82 and the inner wall 81C of the hole 81 are configured to be in surface contact. The center P is the center when the split iron core 60 is rotated.

  Since the split iron core 60 is rotated around P, the end surface of the electromagnetic steel plate 73 on the side of the electromagnetic steel plate 76, the end surface of the electromagnetic steel plate 74 on the side of the electromagnetic steel plate 75, the end surface of the electromagnetic steel plate 75, the end surface of the electromagnetic steel plate 74, The end surface on the electromagnetic steel sheet 73 side is also preferably configured in an arc shape centered on P.

  Next, with reference to FIG. 13, FIG. 14, FIG. 15, FIG. 16 and FIG. 17, a procedure for realizing the configuration of the stator core 32a will be described. Specifically, adjacent divided iron cores 60 are connected in a chain shape, and the connected iron cores are refracted from the connecting portion. This procedure corresponds to a part of the steps of the method for manufacturing the stator core 32a according to the present embodiment. 13, 14, 15, 16, and 17 are enlarged views of the connecting portion of the split iron core 60, and are shown in a plan view as viewed from the vertical direction with respect to the electromagnetic steel sheet. Represents the circumferential direction when the split cores 60A and 60B form the stator core 32a, Y represents the radial direction when the split cores 60A and 60B formed the stator core 32a, and Z represents the split core. 60A and 60B represent axial directions when the stator core 32a is formed.

First, the procedure for connecting the split iron cores 60A and 60B will be described.
As shown in FIG. 13, the electromagnetic steel plate 75 and the electromagnetic steel plate 76 are moved toward the electromagnetic steel plate 73 and the electromagnetic steel plate 74. That is, the split iron core 60B is moved toward the split iron core 60A. At that time, the electromagnetic steel plate 73 of the split iron core 60A and the electromagnetic steel plate 76 of the split iron core 60B are moved so as to be in the same layer. Similarly, the electromagnetic steel plate 74 of the split iron core 60A and the electromagnetic steel plate 75 of the split iron core 60B are moved so as to be in the same layer.

  As shown in FIG. 14, the electromagnetic steel sheet 75 of the layer L2 is inserted into a gap generated below the electromagnetic steel sheet 73 of the upper layer L1. In the process of inserting the electromagnetic steel plate 75 of the layer L2, the protrusion 82 of the electromagnetic steel plate 75 of the layer L2 is opposite to the side where the axial protrusion 82 protrudes from the circumferential end of the electromagnetic steel plate 73 of the layer L1. Is elastically deformed. Specifically, as the electromagnetic steel plate 75 of the layer L2 is inserted, the protrusion 82 is gradually crushed by the circumferential end of the electromagnetic steel plate 73 of the layer L1 that contacts the inclined surface of the protrusion 82. The circumferential end portion of the electromagnetic steel plate 73 corresponds to the end 3C of the electromagnetic steel plate 73 of the layer L1 shown in FIG.

Similarly to the electromagnetic steel plate 75 of the layer L2, the electromagnetic steel plate 75 of the layer L4 is also inserted into a gap generated under the electromagnetic steel plate 73 of the upper layer L3.
Therefore, the electromagnetic steel plate 73 of the layer L3 is inserted into a gap generated under the electromagnetic steel plate 75 of the upper layer L2.

  As described above, in the present embodiment, since the protrusions 82 of the electromagnetic steel sheet 75 are elastically deformed, the electromagnetic steel sheet 75 can be easily inserted as compared with other methods such as press fitting.

As shown in FIG. 15, when the protrusion 82 of the electromagnetic steel plate 75 of the layer L2 reaches the hole 81 of the electromagnetic steel plate 73 of the layer L1, it returns to its original shape by the elastic force and fits into the hole 81. Thereby, the electromagnetic steel plate 75 of the layer L2 and the electromagnetic steel plate 73 of the layer L1 are engaged. The electromagnetic steel plate right side 75 of the layer L4 and the electromagnetic steel plate 73 of the layer L3 are also engaged in the same manner as the electromagnetic steel plate 75 of the layer L2 and the electromagnetic steel plate 73 of the layer L1.
When the hole 81 and the protrusion 82 are fitted, the outer peripheral surface 82C of the protrusion 82 and the inner wall 81C of the hole 81 are in contact with each other, and the outer peripheral surface 82B of the protrusion 82 and the inner wall 81B of the hole 81 are in contact with each other. The state is engaged.

With the mechanism as described above, the hole 81 and the protrusion 82 are engaged, and the divided iron core 60A and the divided iron core 60B are connected. At this time, the connecting portion 65 is configured by the hole 81 and the protrusion 82. The connecting portion 65 is engaged in a state where the outer peripheral surface 82C of the protrusion 82 is in contact with the inner wall 81C of the hole 81 and in a state where the outer peripheral surface 82B of the protrusion 82 is in contact with the inner wall 81B of the hole 81. Yes.
By repeating the above procedure on the other divided iron cores 60, the other divided iron cores 60 can be connected in order to form a chain-connected iron core.

  As shown in FIG. 16, even if the divided core 60B connected temporarily is pulled from the split core 60A in the direction opposite to the direction in which it has moved, the projection 82 of the split core 60B is not separated from the split core 60A. Therefore, a contact force, that is, a drag force acts between the outer peripheral surface 82C of the protrusion 82 and the inner wall 81C of the hole 81, and the divided cores 60A and 60B are not separated. In particular, since the outer peripheral surface 82C of the protrusion 82 and the inner wall 81C of the hole 81 have an arc shape with the same center and the same radius, a large contact force acts on the surface contact between the surfaces. Further, because of the surface contact, even if a larger contact force is applied, the load is distributed over the entire surface, and the engaged state can be maintained without damaging the protrusion 82 and the hole 81.

  When the protrusion 82 and the hole 81 are in point contact, the load concentrates on the contact point, and the protrusion 82 and the hole 81 may be damaged. For example, in the cross section in which the projection 82 is orthogonal to the perpendicular direction of the electromagnetic steel sheet 75, in the case of a square shape, the vertex of the square shape and the arc-shaped surface of the inner wall 81C of the hole 81 are in point contact. If a large contact force is applied, the protrusion 82 or the hole 81 may be damaged. However, in this embodiment, surface contact prevents this.

Even if the connected divided iron core 60B is pushed toward the divided iron core 60A in the direction of movement, the end 3C of the electromagnetic steel plate 73 and the end 6C of the electromagnetic steel plate 76 are pressed against each other, and the electromagnetic steel plate Since the end 4 </ b> C of 74 and the end 5 </ b> C of the electromagnetic steel plate 75 are pressed against each other, they are restrained from each other, and the protrusion 82 does not come out of the hole 81. That is, the split iron cores 60A and 60B are not disconnected.
In addition, even if a force that shifts the connected divided cores 60A and 60B in the radial direction is applied, the contact force between the outer peripheral surface 82B of the protrusion 82 and the inner wall 81B of the hole 81 is shifted in the radial direction. There is no. Also in this case, due to the surface contact between the protrusion 82 and the hole 81, the load is distributed over the entire surface, and the engaged state can be maintained without damaging the protrusion 82 and the hole 81.

  Next, a procedure for refracting the iron cores connected in a chain shape from the connecting portion will be described. Specifically, the split iron core 60B is moved toward the teeth of the split iron core 60A around the connecting portion 65.

When the split cores 60A and 60B are connected in a chain, the outer peripheral surface 82B of the projection 82 and the inner wall 81B of the hole 81 are in contact, and the outer peripheral surface 82C of the projection 82 and the inner wall 81C of the hole 81 are in contact. Are combined. When the split iron core 60B is moved toward the teeth of the split iron core 60A, the protrusion 82 moves from the inner wall 81B side of the hole 81 to the inner wall 81A side of the hole 81 while the outer peripheral surface 82C of the protrusion 82 is along the inner wall 81C of the hole 81. Moving. Then, as shown in FIG. 17, the outer peripheral surface 82A of the protrusion 82 and the inner wall 81A of the hole 81 are stopped in contact with each other.
Thereby, the divided cores 60 </ b> A and 60 </ b> B connected to each other can rotate around the point P of the connecting portion 65 and be refracted. By rotating in this way, the split iron core 60B can be rotated without deviating from the orbit of rotation.

  When the split iron core 60 rotates around the point P of the connecting portion 65, the end 6C of the electromagnetic steel plate 76 moves along the end 3C of the electromagnetic steel plate 73, and the end 5C of the electromagnetic steel plate 75 is the electromagnetic steel plate. It moves along the end 4C of 74. In addition to the contact force between the outer peripheral surface 82C of the protrusion 82 and the inner wall 81C of the hole 81, the contact force between the end 6C of the electromagnetic steel plate 76 and the end 3C of the electromagnetic steel plate 73, the end 5C of the electromagnetic steel plate 75, and the end of the electromagnetic steel plate 74 Since the contact force with 4C is applied and rotated while being used, the divided iron core 60 can be rotated without deviating from the rotation trajectory.

In addition, when the split iron core 60 rotates around the point P of the connecting portion 65, the abutting surfaces are brought into contact with each other or pressed to stop the rotation.
More specifically, the first type of magnetic steel sheet 71 has butted surfaces 83 and 84 at both ends in the circumferential direction of the back yoke as shown in FIG. As shown in FIG. 10, the second type of electromagnetic steel sheet 72 has butt surfaces 85 and 86 at both ends in the circumferential direction of the back yoke. When the split core 60 is annular, the split core 60A and the split core 60B are brought into contact with the butting surface 83 of the split core 60B and the butting surface 84 of the split core 60A. Similarly, the butting surface 85 of the split iron core 60B and the butting surface 86 of the split iron core 60A are in contact with each other.

  Therefore, when the split iron core 60 is rotated, the outer peripheral surface 82A of the protrusion 82 and the inner wall 81A of the hole 81 are in contact with each other, the butting surface 83 of the electromagnetic steel plate 71 of one split iron core 60 and the other split iron core 60. The abutting surface 84 of the electromagnetic steel plate 71 is contacted or pressed, and the abutting surface 85 of the electromagnetic steel plate 72 of one divided iron core 60 and the abutting surface 86 of the electromagnetic steel plate 72 of the other divided iron core 60 are contacted or pressed. Therefore, the rotation is stopped.

  It should be noted that the annular stator core 32a can be formed without the magnetic path of the magnetic flux passing through the back yoke 32b being narrowed by the reliable contact between the butted surfaces. Since the stator core 32a does not narrow the magnetic path of the back yoke 32b, the stator core 32a can be configured without reducing the efficiency of the electric mechanism section 3.

By the procedure as described above, adjacent divided iron cores can be connected in a chain shape, and the connected iron cores can be refracted from the connecting portion.
Even after refraction, even if the split core 60B is pulled from the split core 60A toward the side opposite to that of the split core 60B, the outer peripheral surface 82C of the protrusion 82 and the hole 81 are formed, as in the chain-connected state. Due to the surface contact between the inner wall 81C and the inner wall 81C, the contact force between the projection 82 and the inner wall of the hole 81 works, and the split cores 60A and 60B are not separated. Since the protrusion 82 and the hole 81 are in surface contact, the load as the contact force is dispersed, and the engaged state can be maintained without damaging the protrusion 82 or the hole 81.
Even if the divided iron cores 60A and 60B are pushed in the circumferential direction, the butted surfaces 83 and 84, 85 and 86 are restrained from each other, and the projection 82 does not come out of the hole 81. That is, the split iron cores 60A and 60B are not disconnected.
In addition, even if a force that shifts the connected divided iron cores 60A and 60B in the radial direction is exerted, the contact force between the outer peripheral surface 82A of the protrusion 82 and the inner wall 81A of the hole 81 shifts in the radial direction. There is no. Also in this case, due to the surface contact between the protrusion 82 and the hole 81, the load is distributed over the entire surface, and the engaged state can be maintained without damaging the protrusion 82 and the hole 81.

  Conventionally, the joint surfaces 66A and 66B that finally close the ring are welded, but in the present embodiment, the projection 82 and the hole 81 are also applied to the portion that finally closes the ring, in the same manner as other connecting portions. , And the projection 82 is fitted into the hole 81 and engaged. By using this configuration, the adjacent divided cores 60 can be connected to each other even when the insulating member 32f is attached to the divided cores 60. This is because, by inserting the electromagnetic steel sheet 75 into the gap generated under the upper electromagnetic steel sheet 73, the protrusion 82 fits into the hole 81, so that a riveting or caulking is performed in the lamination direction of the electromagnetic steel sheets. You can connect without having to go. Even if the insulating member 32f covers the connecting portion, the connection of the split core 60 is not hindered.

  However, the procedure of fitting the projection 82 into the hole 81 when the ring is finally closed cannot be assembled by rotating after connection as described above. The connecting operation and the rotating operation cannot be performed individually, and the connecting operation is performed while rotating. However, the effect on the load after engagement is exactly the same as the other connecting parts.

As described above, the stator core 32a can have a predetermined annular shape.
Even if a load is applied to the connected split cores 60 during assembly, the connected split cores 60 are not separated from each other. In particular, the outer peripheral surface 82 </ b> C of the protrusion 82 and the inner wall 81 </ b> C of the hole 81 are in surface contact with each other, and a contact force acts to prevent the divided iron cores 60 from being separated from each other. When the protrusion 82 and the hole 81 are in surface contact, the load as a contact force is dispersed, and the engagement state can be maintained without damaging the protrusion 82 or the hole 81.
Further, even if a reverse load is applied to the connected divided cores 60, the butted surfaces stop each other, and the protrusion 82 does not come out of the hole 81, so that the engaged state can be maintained.
Further, even if a force that shifts the connected divided cores 60 in the radial direction is applied, the contact force between the outer peripheral surface 82A of the protrusion 82 and the inner wall 81A of the hole 81 does not shift in the radial direction. . Also in this case, due to the surface contact between the protrusion 82 and the hole 81, the load is distributed over the entire surface, and the engaged state can be maintained without damaging the protrusion 82 and the hole 81.

  Moreover, since the joint part which closes a ring last can be made into a cyclic | annular form without welding, workability | operativity improves. Furthermore, since all the connecting portions of the stator core 32a can have the same structure, the rigidity of the ring of the stator core 32a can be made uniform. Since the rigidity of the ring of the stator core 32a can be made uniform, the stator core 32a is also resistant to strain with respect to the load applied to the stator core 32a.

On the other hand, after the stator core 32a is assembled in an annular shape, when a load that deforms from the ring shape is applied, the load is reduced by the rotating structure of the connecting portion, the restraining structure, and the restraining structure of the butting surface. While dispersing, it restrains the circumferential and radial shifts of the split iron core.
For example, even if the component expands and contracts due to thermal action, the rotation structure and restraining structure of the connecting portion and the restraining structure of the butting surface generate a repulsive force against distortion, and the annular shape of the stator core 32a Try to maintain. Thereby, even if it press-fits and welds to the airtight container 1, roundness can be maintained.

  In addition, when the stator core 32a is incorporated in the hermetic container 1 and operated as a compressor, the stator core 32a is distorted by the heat action of the refrigerant gas even if it is used so that high-pressure and high-temperature refrigerant gas passes. Absorbs and maintains roundness.

As described above, when the stator core of the present embodiment is incorporated in a sealed container, strain can be absorbed and high roundness can be maintained. That is, it is possible to obtain an electric mechanism section that reduces the load and stress when incorporated in the sealed container and suppresses deformation of the stator and suppresses uneven rotation. And the compressor which suppressed the noise and the efficiency fall is obtained by using the electric mechanism part for a compressor.
In addition, even when operated as a compressor for refrigerant compression, the influence of the heat action of the high-pressure and high-temperature refrigerant gas can be suppressed, and a compressor that suppresses noise and efficiency reduction can be obtained.

  Also, as a stator of a compressor motor, it is possible to manufacture without changing the working environment, as before, by attaching an insulating member to a split iron core, winding a fixed winding, and then assembling in a ring shape. it can.

  Even if the connecting portion of the split iron core is covered with an insulating member and the connecting portion is not visible, the hole and the protrusion are engaged because the stop position is determined by surface contact. It is easy to grasp the engagement position and state at the time of work.

  In addition, since a split core that does not change the work environment can be used, it is necessary to use a thick wire for the stator winding without being restricted by the winding space of the stator. The number of turns can be wound. That is, it is possible to obtain an efficient compressor that maintains the necessary torque of the electric mechanism and reduces the loss due to the stator winding.

  Even if the stator receives a load in the circumferential direction and the radial direction, the split core prevents and suppresses the deviation in the circumferential direction and the radial direction, so there is a gap between the butted surfaces of the back yoke of the split core. Without being born, the abutting surfaces can be reliably in contact with each other and kept in an annular shape. As a result, the magnetic path passing through the back yoke is narrowed, and an efficient compressor can be obtained without reducing the efficiency of the electric mechanism.

  Further, since there is no welded portion for connecting the stator cores, all of the connecting portions of the stator cores can have the same structure, so that the rigidity of the stator core rings can be made uniform. Since the rigidity of the stator core ring can be made uniform, the stator core is also resistant to strain with respect to the load applied to the stator core. Furthermore, workability is improved by not performing welding.

  In addition, since there are no welds in the connection of the stator cores, two types of electrical steel sheets can be used to form the split cores, and stamping dies such as presses can be saved, and production equipment can be used efficiently. It becomes like this.

  In the present embodiment, only the electrical steel sheet having the protrusions 82 or the holes 81 has been described. However, the laminated electrical steel sheets do not necessarily have the protrusions 82 or the holes 81. A magnetic steel plate that does not have the protrusions 82 and the holes 81 may be used as the magnetic steel plates that are being superposed. By using a magnetic steel sheet that does not have the protrusions 82 and the holes 81, when the magnetic steel sheet 75 is inserted into the gap generated under the electromagnetic steel sheet 73 that is one layer above, the resistance between the magnetic steel sheets is reduced, and the insertability is reduced. Can be improved.

Although the inner wall of the hole 81 on the electromagnetic steel plate 74 side, that is, the inner wall on the center P side is also an arc-shaped surface in a plan view as viewed from the perpendicular direction to the electromagnetic steel plate 73, it is not necessarily required to have an arc shape. For example, as shown in FIG. 18, it may be linear in a plan view as viewed from the direction perpendicular to the direction in which the electromagnetic steel sheets are stacked, that is, the electromagnetic steel sheets. The straight inner wall only needs to be composed of at least two sides perpendicular to the inner wall 81A of the hole 81 and the inner wall 81B of the hole 81. With such a configuration, when connecting the split core 60A and the split core 60B, the protrusion 82 and the inner wall on the center P side of the hole 81 do not hinder the protrusion 82 from fitting into the hole 81. Further, when the divided iron core 60B is rotated, the protrusion 82 and the inner wall on the center P side of the hole 81 do not hinder the movement of the protrusion 82 in the hole 81.
On the other hand, the inner wall on the center P side of the hole 81 has an arc shape, whereas the inner wall orthogonal to the inner wall 81A of the hole 81 and the inner wall 81B of the hole 81 makes the hole 81 before rotating the divided iron core 60B. The position of the protrusion 82 with respect to the hole 82 and the position of the protrusion 82 with respect to the hole 81 after rotating the divided iron core 60B are easily determined. As a result, the engaged state is stabilized, and the connection is difficult to be disconnected.

Embodiment 2. FIG.
In the first embodiment, the example in which the hole 81 of the electromagnetic steel sheet 73 has a fan shape in a plan view as viewed from the direction perpendicular to the electromagnetic steel sheet, that is, the direction in which the electromagnetic steel sheets are laminated has been described. In this case, the fan-shaped center P is closer to the electromagnetic steel plate 74 than the hole 81, and the point P is the center of rotation of the divided iron core 60B. However, the hole in the electromagnetic steel sheet 73 does not necessarily have a fan shape, and the center of rotation does not have to be closer to the electromagnetic steel sheet 74 than the hole 81. A case where the center of rotation is at the same position as the hole 81 will be described.

  FIG. 19 is an enlarged view of the connecting portion of the split iron core 60 and is shown in a plan view as viewed from the vertical direction with respect to the electromagnetic steel sheet. FIG. 20 is an enlarged view of the hole portion of FIG. Except that the holes in the electromagnetic steel sheet 73 are made substantially circular and the protrusions are matched to the shape, the same parts are denoted by the same reference numerals.

The hole 87 of the electromagnetic steel plate 73 has a substantially circular cross section perpendicular to the electromagnetic steel plate 73 and has two convex portions 90 and 91 protruding toward the center direction on the inner wall thereof. The convex portions 90 and 91 are disposed so as to face each other. Furthermore, the convex parts 90 and 91 are the same shape, and the cross section orthogonal to the perpendicular direction with respect to the electromagnetic steel sheet 73 is a triangular shape composed of two straight sides.
The convex part 90 is comprised from the outer peripheral surface 90B which comprises one side by the side of the electromagnetic steel plate 74, and the outer peripheral surface 90A which comprises one side by the side of the electromagnetic steel plate 76. The convex part 91 is comprised from 91 A of outer peripheral surfaces which comprise 1 side by the side of the electromagnetic steel plate 74, and 91 B of outer peripheral surfaces which comprise 1 side by the side of the electromagnetic steel plate 76. The outer peripheral surface 90A of the convex portion 90 and the outer peripheral surface 91A of the convex portion 91 are arranged in parallel. Similarly, the outer peripheral surface 90B of the convex part 90 and the outer peripheral surface 91B of the convex part 91 are arranged in parallel.
The inner wall 87C of the hole 87 other than the convex portions 90 and 91 is a part of a circular shape, that is, an arc shape.

  The protrusion 82 of the electromagnetic steel sheet 75 is the same as that of the first embodiment, and protrudes in the direction in which the electromagnetic steel sheets are stacked, that is, in the direction perpendicular to the electromagnetic steel sheet 75. It has elasticity, is inclined in the direction from the electromagnetic steel sheet 74 to the electromagnetic steel sheet 76, the outer peripheral surface of the arc-shaped back yoke 32b of the protrusion 82, and the outer periphery of the arc-shaped back yoke 32b of the protrusion 82 The outer peripheral surface is a plane that is substantially parallel to each other, and that the outer peripheral surface 82C of the electromagnetic steel sheet 76 of the protrusion 82 has a circular arc shape in a cross section perpendicular to the electromagnetic steel sheet 75. This is the same as the protrusion 82 of the first embodiment. Further, the method for forming the protrusions 82 may be formed by any method, but it can be formed by cutting and raising a part of the electromagnetic steel sheet 72 as in the first embodiment.

  The arc shape of the outer peripheral surface 82 </ b> C of the protrusion 82 is formed as an arc shape having the same radius as the radius of the hole 87. Thereby, when the protrusion 82 is fitted in the hole 87, the outer peripheral surface 82 </ b> C of the protrusion 82 is arranged in an arc shape centering on the center of the hole 87. That is, the outer peripheral surface 82C of the protrusion 82 and the inner wall 87C of the hole 87 have an arc shape or a circular shape with the same center and the same radius, and are configured such that the surfaces are in surface contact. The center of the hole 87 is the center P when the split iron core 60B is rotated.

The procedure for connecting the split iron cores 60 and the procedure for bending the split iron cores 60 from the connecting portion and forming them in an annular shape are the same as in the first embodiment.
Specifically, the electromagnetic steel sheet 75 is inserted into a gap generated under the electromagnetic steel sheet 73 of the upper layer. Thereby, the protrusion 82 is fitted into the hole 87 and engaged. The protrusion 82 and the hole 87 are in a state where the outer peripheral surface 82C of the protrusion 82 and the inner wall 87C of the hole 87 are in contact, and in a state where the outer peripheral surface 82A of the protrusion 82 and the outer peripheral surface 90A of the convex portion 90 of the hole 87 are in contact. The outer peripheral surface 82B of the protrusion 82 and the outer peripheral surface 91A of the convex portion 91 of the hole 87 are engaged with each other.
Through the above steps, the split core 60A and the split core 60B are connected, and the connecting portion 65 is also configured.
Next, the split iron core 60B is moved toward the B teeth of the split iron core 60A. At this time, the outer peripheral surface 82C of the protrusion 82 moves along the inner wall 87C of the hole 87, whereby the protrusion 87 is moved. Then, the outer peripheral surface 82A of the protrusion 82 and the outer peripheral surface 90B of the convex portion 90 of the hole 87 are in contact with each other, and the outer peripheral surface 82B of the protrusion 82 and the outer peripheral surface 91B of the convex portion 91 of the hole 87 are in contact with each other. The move ends.
As a result, the connecting portion 65 rotates around the center P of the hole 89, and the protrusion 88 rotates in the hole 89. By rotating in this way, the split iron core 60B can be rotated without deviating from the orbit of rotation.

  When the split iron core 60B rotates about the connecting portion 65, the end 6C of the electromagnetic steel plate 76 moves along the end 3C of the electromagnetic steel plate 73, and the end 5C of the electromagnetic steel plate 75 is the end of the electromagnetic steel plate 74. It is the same as that of Embodiment 1 that it moves along 4C, and the butting surfaces of the division | segmentation iron core 60 contact or are pressed, and rotation is stopped.

However, since it rotates around the hole 87, the turning radius of the split iron core is reduced. Therefore, when the stator core 32a having a small diameter is formed, an effective configuration is obtained.
Further, since the hole 87 is a hole provided with the convex portions 90 and 91, when the projection 82 is fitted, the stopping position is determined. As a result, even if the connecting portion of the split iron core is covered with an insulating member and the connecting portion is not visible, the hole and the protrusion are engaged because the stop position is determined by surface contact. It is easy to grasp the engagement position and state during operation.

  Even when a load is applied to the connected divided cores 60 during assembly, the outer peripheral surface 82C of the protrusion 82 and the inner wall 87C of the hole 87 are in surface contact with each other. It is the same as in the first embodiment that the separation from the iron core 60B is suppressed, the load as the contact force is dispersed, and the projection 88 or the hole 87 is not damaged.

  Moreover, it is the same as that of Embodiment 1 that the joint part which closes a ring last can be made into cyclic | annular form, without welding. Therefore, the rigidity of the ring of the stator core can be made uniform, and the stator core is also resistant to strain with respect to the load applied to the stator core. Furthermore, workability is improved by not performing welding.

DESCRIPTION OF SYMBOLS 1 Airtight container, 2 Compression mechanism part, 3 Electric mechanism part, 4 Crankshaft, 5 Discharge pipe, 6 Intake pipe, 11 Upper container, 12 Lower container, 21 Cylinder, 22 Rolling piston, 23 Main bearing, 24 Secondary bearing, 25 Vane, 26 Cylinder chamber, 27 Vane groove, 28 Back pressure chamber, 29 Discharge muffler, 30 Opening, 31 Rotor, 31a Rotor core, 31b Upper balance weight, 31c Lower balance weight, 31d Rivet, 31e Permanent magnet, 31f Communication hole, 31g Oil separator, 32 Stator, 32a Stator iron core, 32b Back yoke, 32c Teeth, 32d Stator winding, 32e Slot, 32f Insulating member, 33 Lead wire, 34 Terminal, 41 Main shaft part, 42 Secondary Shaft,
43 eccentric shaft part, 60, 60A, 60B split iron core, 61 caulking, 62 holes, 63, 64 end face, 65 connecting part, 66 joint part, 66A, 66B joint surface, 71 first type electrical steel sheet, 72 2 types of electrical steel sheet, 73, 74, 75, 76 electrical steel sheet, 81 holes, 82 protrusions, 83, 84, 85, 86 butting surfaces, 87 holes, 90, 91 convex parts, 100 hermetic compressor, 101 suction Muffler, 102 piping, 103 condenser, 104 expansion valve, 105 evaporator, 106 four-way valve.

This invention was made in order to solve the above-described problems. A plurality of divided iron cores formed by laminating a plurality of electromagnetic steel sheets are connected in the circumferential direction, and fixed in a cylindrical shape. In the child , the split iron core is connected in a cylindrical shape without welding, and the connecting part relaxes the load and stress when assembled in a sealed container, and provides a stator iron core that suppresses deformation in the radial and circumferential directions. To do.

The stator according to the present invention is formed by laminating a plurality of electromagnetic steel plates, the split iron heart with teeth and the back yoke at connecting portions of the back yoke in the circumferential direction, a plurality, is connected, in a cylindrical shape In the configured stator ,
The split core includes a collision force, and the hole in the other circumferential direction of the end portion of the back yoke, the one circumferential end portion of the back yoke,
Connecting portion, the holes of one split core, projections fitted write Marete other adjacent segment core, and the engagement is configured to rotate,
The split iron core is obtained by connecting all the connecting portions of the split iron core at the connecting portion and connecting the connecting portions closed in a cylindrical shape at the connecting portion .

The stator according to the present invention, the connecting portion of the divided core, into the hole of one of the split cores, is fitted the protrusion of the other adjacent segment core, engaged, configured to rotate, split Since all the connecting parts of the iron core are connected by the connecting part, and the connecting part that is closed in a cylindrical shape is also connected by the connecting part, it is connected and rotated by the connecting part without welding the split iron core, Can be configured in a cylindrical shape. And when incorporating in an airtight container by the connection part, the load and stress concerning a stator can be relieve | moderated and a deformation | transformation of the stator to radial direction and the circumferential direction can be suppressed. Thereby, the speed variation of the rotation speed of the compressor motor can be suppressed, and noise generation and efficiency reduction can be suppressed.

Claims (12)

A plurality of electromagnetic steel plates laminated and connected with a plurality of the back yokes of the split iron core having teeth and a back yoke in the circumferential direction at the connecting portion of the back yoke, and fixed in a cylindrical shape In the child core,
The split iron core has an arcuate protrusion on the teeth side at one end in the circumferential direction of the back yoke, and a side opposite to the side where the protrusion is disposed on the other end in the circumferential direction of the back yoke. An arc-shaped hole, and
The connecting portion has the projections of the other adjacent split cores fitted in the holes of one of the split cores, and the arc-shaped outer peripheral surface of the projections is in contact with the arc-shaped inner wall of the holes, A stator core configured to be engaged.   The stator core according to claim 1, wherein the connecting portion rotates the connected divided iron cores.   3. The stator core according to claim 1, wherein a radius of the arc-shaped inner wall of the hole matches a radius of the arc-shaped outer peripheral surface of the protrusion. The split iron core is configured by stacking a first electromagnetic steel plate and a second electromagnetic steel plate,
4. The stator core according to claim 1, wherein the hole is provided in the first electromagnetic steel plate, and the protrusion is provided in the second electromagnetic steel plate. 5.   5. The stator core according to claim 4, wherein the hole has a fan-shaped cross section perpendicular to the vertical direction with respect to the first electromagnetic steel sheet.   The stator core according to claim 5, wherein the divided core is prevented from rotating by the projection coming into contact with the fan-shaped linear portion of the hole.   The hole of the first electromagnetic steel sheet has a circular cross section perpendicular to the vertical direction with respect to the first electromagnetic steel sheet, and has a triangular protrusion toward the center of the circular shape. The stator core according to claim 4, wherein   The stator core according to claim 7, wherein the split iron core is prevented from rotating by the projection coming into contact with the straight portion of the convex portion of the hole.   The stator according to any one of claims 4 to 8, wherein the protrusion has an elastic force in a direction perpendicular to the second electromagnetic steel sheet, and is fitted into the hole by the elastic force. Iron core. The first electromagnetic steel plate has a protruding portion protruding in the circumferential direction of the back yoke from the stacked second electromagnetic steel plates on one end of the circumferential direction of the back yoke,
The second electromagnetic steel sheet has a protruding portion that protrudes in the circumferential direction of the back yoke from the stacked first electromagnetic steel sheets, on the other end of the circumferential direction of the back yoke.
The hole is provided in the protruding portion of the first electromagnetic steel sheet,
The stator core according to any one of claims 4 to 9, wherein the protrusion is provided on a protruding portion of the second electromagnetic steel sheet.   The split iron core includes an insulating member on an arc-shaped axial end surface of the back yoke, and the insulating member is disposed in the axial direction of the hole. The stator core according to crab. The stator core according to any one of claims 1 to 11,
A compressor including an airtight container in which the stator core is fixed.

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