JP5221030B2 - Rotor, rotor manufacturing method, hermetic compressor, and refrigeration cycle apparatus - Google Patents

Description

  The present invention relates to a rotor using a permanent magnet, a method for manufacturing the rotor, a hermetic compressor, and a refrigeration cycle apparatus.

  In a high-efficiency hermetic compressor used in a refrigeration cycle, a brushless DC motor having a permanent magnet disposed on a rotor is used as an electric element, and a method of operating at a variable frequency by a dedicated control device having an inverter is used.

  Usually, a rotor in which permanent magnets are arranged generally has a structure in which a magnet insertion hole is provided in a rotor core obtained by punching and laminating thin electromagnetic steel sheets, and the permanent magnet is fitted into the rotor core with a gap.

  Further, since the compression element repeats the compression and suction cycles, the load torque varies in one cycle. For this reason, the inertial force becomes weaker as the driving speed becomes lower, so that the vibration due to the rotation unevenness increases, and the operable frequency is determined by the limit value of the vibration. Nowadays, it has become possible to operate at a lower speed by using a technique called torque control that generates torque of the electric element in accordance with the load torque and suppresses rotation unevenness.

  However, it is difficult to achieve optimal torque control over the entire operating range, and if the torque control is in excess of the optimal point, the rotor core magnets will remain even if the vibration is suppressed to a necessary and sufficient level. A magnet arranged with a clearance fit in the insertion hole is vibrated back and forth in the rotational direction, which may generate noise, and operation at a low frequency is difficult.

  In order to prevent this magnet vibration, it is effective to fix the magnet. As a magnet fixing method, a method of fixing the permanent magnet using an additional member has been proposed (for example, see Patent Document 1).

Further, there has been proposed a method in which a protrusion is provided in a magnet insertion hole of a rotor core and a protrusion is plastically deformed and fixed by press-fitting a permanent magnet (for example, see Patent Document 2).
Japanese Utility Model Publication No. 9-182334 (FIG. 1) Japanese Patent Laid-Open No. 5-219668 (FIG. 2)

  As in Patent Document 1, the method of fixing a permanent magnet using an additional member requires a cost for the additional member, and there is a problem that the number of steps is increased and the cost is increased even during assembly.

  Further, as in Patent Document 2, the method of providing a protrusion in the magnet insertion hole of the rotor core and press-fitting the permanent magnet requires a large chamfering to improve the magnet insertion property, and the processing cost is increased. As a result, there is a problem that the magnetic force of the magnet is reduced.

  The present invention has been made to solve the above-described problems, and is capable of reducing noise caused by vibration of a magnet and capable of operating at a lower speed, a method for manufacturing the rotor, and hermetic compression. An object is to provide a machine and a refrigeration cycle apparatus.

  A rotor according to the present invention includes a rotor core obtained by punching and laminating thin electromagnetic steel sheets, a plurality of magnet insertion holes provided inside the outer peripheral surface of the rotor core and extending in the circumferential direction, and the magnet insertion holes And a thin portion formed so that at least a part of the axial direction narrows the radial width of the magnet insertion hole, and the radial width of the magnet insertion hole is narrowed. And a permanent magnet press-fitted into the portion.

  The rotor which concerns on this invention has the effect that a vibration of a magnet is prevented by the said structure, a noise is reduced, and it can drive | operate at low speed.

Embodiment 1 FIG.
1 to 6 show the first embodiment, FIG. 1 is a sectional view of a hermetic compressor 37, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along line BB of FIG. 2, FIG. 5 is a block diagram of a control device 30 for controlling the hermetic compressor 37, and FIG. 6 is a diagram showing pulsation of compression torque of the hermetic compressor 37. It is.

  The overall configuration of the hermetic compressor 37 will be described with reference to FIG. The hermetic compressor 37 will be described by taking a one-cylinder rotary compressor as an example. The hermetic compressor 37 accommodates a compression element 2 that compresses a refrigerant and an electric element 3 that drives the compression element 2 in a hermetic container 1 composed of an upper container 1a and a lower container 1b. . The compression element 2 and the electric element 3 are connected by a crankshaft 4, and the compression element 2 is accommodated in the lower part of the sealed container 1 and the electric element 3 is accommodated in the upper part of the sealed container 1.

  In the compression element 2, a rolling piston 9 that fits in the eccentric portion 8 of the crankshaft 4 is housed in a cylinder 5, and one end of a vane (not shown) that reciprocates radially in a groove provided in the cylinder 5 is a rolling piston. A compression chamber is formed in contact with the outer periphery of 9. Openings at both axial ends of the cylinder 5 are closed by a main bearing 6 and a sub-bearing 7.

  Next, the electric element 3 will be described with reference to FIGS. 2 to 4 in addition to FIG. The electric element 3 includes a stator 10 and a rotor 11 and is, for example, a brushless DC motor. The stator 10 is axially formed on a stator core 13 formed by stacking stator core sheets formed by punching thin electromagnetic steel sheets and a plurality of teeth 13 a formed on the inner diameter side of the stator core 13. Insulating member 15 that is divided and fitted, copper wire 16 having an insulating film wound on insulating member 15, and copper wires 16 or copper wire 16 and lead wire 17 on insulating member 15 And a terminal for connecting the two.

  The rotor 11 is configured by laminating a rotor core sheet formed by punching a thin electromagnetic steel sheet, and includes a magnet insertion hole 22, a magnet fixing thin portion 41 and an air hole 40 formed adjacent to the magnet insertion hole 22. The rotor core 21 having (an example of a hole formed in the axial direction), the permanent magnet 24 inserted into the magnet insertion hole 22, and the both ends of the rotor core 21 are disposed to prevent the permanent magnet 24 from scattering. The upper balance weight 25a (located at the upper end of the rotor core 21 in the hermetic compressor 37) and the lower balance weight 25b (in the hermetic compressor 37, the rotor core 21) also serve as an end plate to prevent. And an upper balance weight 25a, a lower balance weight 25b, and a rivet 26 that fixes the rotor core 21. The rivet 26 is inserted into the rivet hole 46. The upper balance weight 25a, the lower balance weight 25b, and the end plate may be separate parts.

  Note that, for example, at least one circular air hole 40 provided on the radially inner side of the magnet insertion hole 22 is provided for the magnet insertion hole 22. The original role of the air hole 40 is to guide the refrigerant gas discharged from the compression element 2 to the upper part of the sealed container 1 and to drop the refrigerating machine oil guided to the upper part of the sealed container 1 together with the refrigerant gas to the lower part of the sealed container 1. It is. As shown in FIG. 3, the air hole 40 of the present embodiment has a protruding portion 40 c in which a part thereof protrudes toward the magnet insertion hole 22. An air hole 45 having no protrusion 40c is also formed. A thin portion 41 is provided between the magnet insertion hole 22 and the protruding portion 40c. As will be described in detail later, the thin-walled portion 41 allows a portion where the radial width of the magnet insertion hole 22 is smaller than the thickness of the permanent magnet 24 before the permanent magnet 24 is inserted. The permanent magnet 24 is press-fitted into and fixed. Although the thin portion 41 is provided on the radially inner side adjacent to the magnet insertion hole 22, it may be provided on the radially outer side or adjacent to the side surface.

  As shown in FIG. 4, when the rotor core 21 is incorporated in the hermetic compressor 37, it becomes an upper end, and a thin portion between the air hole 40 and the magnet insertion hole 22 on the side where the upper balance weight 25a is mounted. 41 is deformed so that a part or the whole thereof is tapered outward in the radial direction, and the radial width of this part is smaller than the thickness of the permanent magnet 24. Then, the permanent magnet 24 is press-fitted into this portion, and the permanent magnet 24 is fixed to the rotor core 21. In the present embodiment, a part of the thin portion 41 is tapered and the other part is deformed so as to be parallel to the axial direction. This is to prevent the permanent magnet 24 from cracking by pressing the permanent magnet 24 more than necessary when the height of the permanent magnet 24 varies. Further, in the present embodiment, there are a total of six air holes 40 that form the thin portion 41 between the magnet insertion hole 22, and FIG. 4 shows two of these air holes 40.

  The inner diameter of the rotor core 21 is smaller than the outer diameter of the crankshaft 4, and the rotor core 21 is shrink-fitted and fixed to the main shaft 4 a of the crankshaft 4.

  As shown in FIG. 1, an accumulator 27 that stores liquid refrigerant is provided adjacent to the sealed container 1, and the accumulator 27 is connected to the cylinder 5 by a suction connection pipe 28.

  The refrigerant gas compressed in the cylinder 5 is discharged into the sealed container 1, passes through the electric element 3, and is sent out from the discharge pipe 29 to the refrigeration cycle apparatus.

  As shown in FIG. 5, the control device 30 for controlling the hermetic compressor 37 is connected to an outlet 34 connected to a single-phase or three-phase AC power source, and performs a rectification, and a hermetic compressor. An inverter 33 that supplies a drive voltage to 37, a compressor operating current detector 35 that detects the operating current of the hermetic compressor 37, and a calculator 36 that calculates the phase between the stator 10 and the rotor 11. Prepare.

  Next, the operation will be described. The single-phase or three-phase AC voltage supplied from the outlet 34 is rectified by the converter unit 32, modulated by a modulation method such as using PWM, PAM, or both by the inverter unit 33, and compressed in the control device 30. Information obtained by the machine operating current detection device 35 and the induced voltage constant, d-axis inductance, q-axis inductance, winding resistance value, torque constant, etc. of the electric motor 3 that is driven and stored in the control device 30 in advance The phase of the rotor 11 and the stator 10 is calculated by the calculation unit 36 from the information specific to the electric element, and the voltage is supplied from the inverter unit 33 to the hermetic compressor 37 at the optimal timing for driving.

  A current flows through the copper wire 16 with the voltage supplied to the hermetic compressor 37, and a magnetic field generated by the current forms a closed loop that passes through the stator core 13 and the rotor core 21. Since the voltage is applied so that the magnetic field rotates, the rotor 11 rotates the crankshaft 4 by the magnetic force and reluctance torque of the permanent magnet 24 of the rotor 11.

  Due to the rotational movement of the crankshaft 4, the rolling piston 9 fitted to the eccentric portion 8 of the crankshaft 4 rotates in the cylinder 5. As a result, the refrigerant gas is sucked into the cylinder 5 from the accumulator 27 through the suction connecting pipe 28, and the refrigerant sucked into the cylinder 5 is compressed and then discharged from the discharge pipe 29 provided at the upper part of the hermetic container 1 to the refrigeration cycle apparatus. leak.

  In the hermetic compressor 37 (one-cylinder rotary compressor) operated in this way, when the crankshaft 4 makes one rotation, the suction and compression processes occur once, and the load torque characteristics shown in FIG. have. Therefore, the control device 30 controls the electric element 3 to generate a torque that matches this torque characteristic, thereby suppressing the rotation unevenness and reducing the vibration. This is particularly effective for operation at 40 rps or less where the inertial force of the rotating body is reduced.

  However, as in the present embodiment, a hermetic compressor 37 having no direct phase detection means for the rotor 11 and the stator 10, such as a magnetic sensor using a Hall element or an encoder for detecting the rotational phase of the shaft. Then, the position is estimated based on information such as an operating current and an induced voltage generated between phases, and it is very difficult to ideally control the torque control in all regions. Actually, there may be a deviation from the optimum point within a range where vibration is suppressed. At this time, the magnetic field generated by the stator 10 may be alternately shifted in the rotational direction and the counter-advancing direction when viewed from the permanent magnet 24 of the rotor 11. When fitted, the vibration generates noise.

  In the present embodiment, as shown in FIGS. 2 and 3, the refrigerant gas is guided to the upper part of the sealed container 1, and the air hole 40 for dropping the refrigerating machine oil guided to the upper part of the sealed container 1 together with the refrigerant gas to the lower part of the sealed container 1. Is formed in a shape having a protruding portion 40c protruding to the magnet insertion hole 22 side, and a thin portion 41 is provided between the magnet insertion hole 22 and the air hole 40, and the permanent magnet 24 is inserted as shown in FIG. Before the magnet insertion hole 22 becomes narrower than the thickness of the permanent magnet 24, a part of the insertion direction (the end portion on the upper balance weight 25a side in the example of FIG. 4) is deformed to be tapered. The permanent magnet 24 is fixed by press-fitting the permanent magnet 24 here. The thin portion 41 for deforming the iron core and fixing the permanent magnet 24 may be provided separately from the air hole 40, and may be provided at a plurality of locations for one magnet insertion hole 22.

  It is very expensive to construct the magnet insertion hole 22 in a taper shape in the stacking direction with a mold because the structure of the mold is complicated. Further, in the method of fixing the permanent magnet 24 by deforming the thin-walled portion 41 after the permanent magnet 24 is inserted, the springback of the deformed thin-walled portion 41 has a sufficient effect for suppressing magnet vibration due to torque control excitation. It was not obtained.

  As described above, the permanent magnet 24 is fixed by press-fitting the permanent magnet 24 by deforming the thin portion 41 between the magnet insertion hole 22 and the air hole 40 of the rotor core 21 into a tapered shape before inserting the permanent magnet 24. The hermetic compressor 37 using the rotating rotor 11 can suppress vibration noise of the permanent magnet 24 even during low-speed operation by torque control, reduce vibration and noise, and at a lower speed, hermetic compressor. 37 can be operated.

Embodiment 2. FIG.
In the first embodiment, the hermetic compressor 37 having the rotor 11 that fixes the permanent magnet 24 by deforming the thin portion 41 between the magnet insertion hole 22 and the air hole 40 of the rotor core 21 has been described. In the second embodiment, a method for manufacturing the rotor 11 will be described.

  FIG. 7 is a diagram showing the second embodiment, and shows an example of the deformation process of the rotor core 21. In FIG. 7 (a), an iron core deforming jig 38 (here, six deforming jigs are integrated) with respect to the rotor iron core 21 which is laminated and joined to each electromagnetic steel plate by caulking. Be prepared. In FIG. 7B, the iron core deforming jig 38 is inserted into the six air holes 40 of the rotor iron core 21, and the thin part 41 near one end in the axial direction is deformed so as to narrow the radial width of the air hole 40. Is done. In FIG. 7C, the iron core deforming jig 38 obtained by deforming the thin portion 41 is removed from the rotor iron core 21. In FIG. 7D, the permanent magnet 24 is inserted from the other axial end of the rotor core 21. At this time, an outer periphery deformation prevention jig 39 is attached at least near one end in the axial direction of the rotor core 21 so that the outer periphery of the rotor core 21 is not deformed. The permanent magnet 24 is press-fitted and fixed in the magnet insertion hole 22 in which the thin portion 41 is deformed and the radial width is narrowed. FIG. 7E shows a state where the outer peripheral deformation prevention jig 39 is removed and the permanent magnet 24 is press-fitted.

  In the deformation process of the thin portion 41 in FIG. 7B, the thin portion 41 can be easily deformed by using the iron core deforming jig 38 that fits into the protruding portion 40c of the air hole 40.

Embodiment 3 FIG.
FIG. 8 shows the third embodiment and is a refrigerant circuit diagram of the air conditioner. As shown in FIG. 8, the refrigerant circuit of the air conditioner includes a hermetic compressor 37, a four-way valve 50, an outdoor heat exchanger 51, a decompression device 52 (electronic expansion valve), an indoor heat exchanger 53, and an accumulator for the refrigerant circuit. 54.

  During the cooling operation, as shown by the solid line in FIG. 8, the refrigerant includes the hermetic compressor 37, the four-way valve 50, the outdoor heat exchanger 51, the decompression device 52, the indoor heat exchanger 53, the four-way valve 50, and the refrigerant circuit. It flows in the order of the accumulator 54 and the hermetic compressor 37.

  During the heating operation, as shown by the broken line in FIG. 8, the refrigerant includes the hermetic compressor 37, the four-way valve 50, the indoor heat exchanger 53, the decompression device 52, the outdoor heat exchanger 51, the four-way valve 50, and the refrigerant circuit. It flows in the order of the accumulator 54 and the hermetic compressor 37.

  By using the hermetic compressor 37 of the first embodiment, vibration and noise of the air conditioner can be reduced, and the hermetic compressor 37 can be operated at a low speed.

  Although the air conditioner has been described as an example, the hermetic compressor 37 can be used for a device that uses a refrigeration cycle, for example, a refrigeration cycle device such as a refrigerator, a showcase, or a water heater.

Embodiment 4 FIG.
9 to 12 are diagrams showing the fourth embodiment. FIG. 9 is a diagram for explaining the behavior during operation of the permanent magnet 24 in the rotor 11 of the first embodiment. FIG. 10 is a diagram illustrating the air hole 40 of the rotor core 21. FIG. 11 is a diagram showing a deformation process of the thin portion 41 of the rotor core 21, and FIG. 12 is a diagram for explaining the behavior of the permanent magnet 24 in the rotor 11 during operation.

  9A is a plan view of the rotor core 21 according to the first embodiment, FIG. 9B is a sectional view taken along the line AA in FIG. 9A, and FIG. 9C is a sectional view taken along the line BB in FIG. It is. As already described, in the hermetic compressor 37 having no direct phase detection means for the rotor 11 and the stator 10, such as a magnetic sensor using a Hall element or an encoder for detecting the rotational phase of the shaft, the operating current is The position is estimated based on information such as the induced voltage generated between the phases, and it is very difficult to ideally control the torque control in all regions. Actually, there may be a deviation from the optimum point within a range where vibration is suppressed. At that time, the magnetic field generated by the stator 10 may be alternately shifted in the rotational direction and the counter-advancing direction when viewed from the permanent magnet 24 of the rotor 11, which vibrates the permanent magnet 24. In the first embodiment, as shown in FIG. 9B, the permanent magnet 24 is pressed by the thin portion 41 in the vicinity of one axial end portion, so that the operation is performed under a condition where the load torque is large or at a lower frequency. In the electric motor, there is a case where a moment is generated by the magnetic force applied alternately to the traveling direction and the counter-traveling direction acting on the permanent magnet 24, and the permanent magnet 24 performs a pendulum motion to generate vibration and noise.

Therefore, in the present embodiment, the protrusion 22a is provided in the magnet insertion hole 22 of the rotor iron core 21, and the permanent magnet 24 is pressed by the thin portion 41 over substantially the entire length in the axial direction. When the radial width of the magnet insertion hole 22 is A, the thickness of the permanent magnet 24 is B, and the height of the protrusion 22a is C,
C> A-B (1)
0 <C- (AB) <α (2)
It is necessary to satisfy the relationship. Here, α is a value that does not damage the permanent magnet 24.

  However, if there is a protrusion 22a on the entire axial length of the magnet insertion hole 22 of the rotor core 21, the permanent magnet 24 cannot be smoothly inserted into the magnet insertion hole 22. If machining such as chamfering of the permanent magnet 24 is performed, insertion is possible even if the protrusion 22a is present, but machining the permanent magnet 24 affects its characteristics, which is not preferable.

Therefore, one axial end of the magnet insertion hole 22 (the insertion side end of the permanent magnet 24) is widened so that the permanent magnet 24 can be easily inserted into the magnet insertion hole 22. The thin portion 41 is deformed, and the magnet insertion hole 22 is widened on the air hole 40 side. FIG. 11 shows a step of expanding one axial end of the magnet insertion hole 22.
(A) The iron core deformation jig 38 is set above the rotor iron core 21.
(B) Insert the iron core deformation jig 38 from one axial end of the magnet insertion hole 22. At this time, the outer periphery deformation preventing jig 39 is set on the outer periphery of the rotor core 21 so that the outer periphery of the rotor core 21 is not deformed.
(C) The iron core deformation jig 38 is removed from the magnet insertion hole 22.
(D) The permanent magnet 24 is press-fitted from one axial end of the expanded magnet insertion hole 22.
(E) The rotor 11 is completed.

  12A is a plan view of the rotor 11, FIG. 12B is a cross-sectional view taken along line AA in FIG. 12A, and FIG. 12C is a cross-sectional view taken along line BB in FIG. As shown in (b), even if a magnetic force applied alternately to the direction of rotation and the direction of counter-rotation acts on the permanent magnet 24, the permanent magnet 24 is held by the thin portion 41 from almost half the axial direction. Therefore, the generation of moments due to magnetic force can be prevented, and the possibility of vibration and noise due to pendulum movement is eliminated. In addition, the permanent magnet 24 should just be pressed by the thin part 41 in the half or more of the axial direction.

  In addition, although the protrusion 22a demonstrated what was located in the center vicinity of the magnet insertion hole 22, the position and number may be arbitrary. However, the position and number of the air holes 40 are also changed accordingly.

Embodiment 5 FIG.
FIGS. 13 and 14 are diagrams showing the fifth embodiment, FIG. 13 is a diagram showing a deformation process of the thin portion 41 of the rotor core 21 and a press-fitting process of the permanent magnet 24, and FIG. 14 is a diagram showing the permanent magnet 24 in the rotor 11. It is a figure explaining the behavior in driving | operation.

  In the present embodiment, the permanent magnet 24 is pressed in at least two locations in the axial direction, thereby preventing the generation of moment due to the magnetic force and suppressing the pendulum movement of the permanent magnet 24 during operation.

  The realization means is by processing. FIG. 13 shows a deformation process of the thin portion 41 of the rotor core 21 and a press-fitting process of the permanent magnet 24. Here, two types of iron core deformation jigs 38a and iron core deformation jigs 38b are used. The iron core deforming jig 38a has two protruding portions on the outside, and the cross section is tapered in the axial direction. Also, an iron core deforming jig 38b having a taper shape in the axial direction is prepared. When the iron core deforming jig 38a and the iron core deforming jig 38b are combined, the thickness in the radial direction is made uniform. Moreover, the tip of the iron core deforming jig 38b is thin on the assumption that it will be extracted later.

The steps of FIG. 13 will be described in order.
(A) Insert the iron core deformation jig 38a into the air hole 40 first. Further, the tip end portion of the iron core deforming jig 38 b is inserted into the air hole 40.
(B) The iron core deformation jig 38b is pushed into the air hole 40. By this operation, the thin portion 41 follows the shape of the outer side of the iron core deforming jig 38a and is deformed at two locations in the axial direction, thereby narrowing the radial width of the magnet insertion hole 22 at that portion.
(C) The iron core deformation jig 38b is extracted from the air hole 40.
(D) The iron core deformation jig 38a is also extracted from the air hole 40.
(E) The iron core outer periphery deformation prevention jig 39 is set, and the permanent magnet 24 is inserted into the magnet insertion hole 22.
(F) The rotor 11 is completed. The permanent magnet 24 is fixed by thin portions 41 at two axial positions.

  14A is a plan view of the rotor 11, FIG. 14B is a cross-sectional view taken along line AA of FIG. 14A, and FIG. 14C is a cross-sectional view taken along line BB of FIG. As shown in (b), even if a magnetic force applied alternately to the direction of rotation and the direction of counter-rotation acts on the permanent magnet 24, the permanent magnet 24 is pressed by the thin portion 41 at two locations in the axial direction. This prevents the generation of moments due to magnetic force and eliminates the risk of vibration and noise caused by pendulum movement.

Embodiment 6 FIG.
FIG. 15 is a diagram illustrating the sixth embodiment, and is a diagram illustrating a deformation process of the thin portions 41 a and 41 b of the rotor cores 21 a and 21 b and a press-fitting process of the permanent magnet 24.

  In the present embodiment, as in the fifth embodiment, the permanent magnet 24 is pressed in at least two locations in the axial direction, thereby preventing the generation of moment due to magnetic force and suppressing the pendulum movement of the permanent magnet 24 during operation. To do. However, here, the rotor core 21 is divided into two parts, and the thin part 41 near the end in the axial direction is deformed by the same method as in the first embodiment. These are combined to form the rotor 11.

The deformation process of the thin portions 41a and 41b of the rotor cores 21a and 21b and the press-fitting process of the permanent magnet 24 will be described with reference to FIG.
(A) The iron core deformation jig 38 is set above the rotor iron core 21a divided into two.
(B) The iron core deformation jig 38 is inserted into the air hole 40a to deform the thin portion 41a.
(C) The iron core deformation jig 38 is extracted from the air hole 40a.
(D) The iron core deformation jig 38 is set above the rotor core 21b divided into two.
(E) The core deformation jig 38 is inserted into the air hole 40b to deform the thin portion 41b.
(F) The core deformation jig 38 is extracted from the air hole 40b.
(G) Align the rotor core 21a and the rotor core 21b.
(H) The iron core outer periphery deformation prevention jig 39 is set, and the permanent magnet 24 is press-fitted into the magnet insertion hole 22.
(I) The rotor 11 is completed.

  In the rotor 11 manufactured by the above-described process, the permanent magnet 24 is held by the thin portion 41 at two positions in the axial direction even when the magnetic force applied alternately to the rotation direction and the counter-movement direction acts on the permanent magnet 24. As a result, the generation of moments due to magnetic force can be prevented, and the possibility of generating vibration and noise by pendulum movement is eliminated.

  In addition, the division | segmentation number of the rotor core 21 may be arbitrary.

  Moreover, the deformation | transformation location and number of a thin part of each divided | segmented rotor core may be arbitrary.

  As in the first embodiment, by using the hermetic compressor 37 on which the rotor 11 according to the fourth to sixth embodiments is mounted, vibration and noise of a refrigeration cycle such as an air conditioner can be reduced. The hermetic compressor 37 can be operated at a low speed.

FIG. 5 shows the first embodiment, and is a cross-sectional view of a hermetic compressor 37. FIG. It is a figure which shows Embodiment 1, and is AA sectional drawing of FIG. FIG. 5 shows the first embodiment, and is an enlarged view of the vicinity of the air hole 40 of the rotor core 21. It is a figure which shows Embodiment 1, and is BB sectional drawing of FIG. FIG. 3 is a diagram illustrating the first embodiment and is a block diagram of a control device 30 that controls the hermetic compressor 37; FIG. FIG. 5 shows the first embodiment and is a diagram showing pulsation of compression torque of the hermetic compressor 37. FIG. FIG. 10 shows the second embodiment and is a diagram showing a deformation process of the thin portion 41 of the rotor core 21. It is a figure which shows Embodiment 3, and is a refrigerant circuit figure of an air conditioner. It is a figure which shows Embodiment 4 and is a figure explaining the behavior in the driving | operation of the permanent magnet 24 in the rotor 11 of Embodiment 1. FIG. FIG. 10 is a diagram showing the fourth embodiment, and is an enlarged view of the vicinity of the air hole 40 of the rotor core 21. It is a figure which shows Embodiment 4, and is a figure which shows the deformation | transformation process of the thin part 41 of the rotor core 21. FIG. FIG. 10 is a diagram illustrating the fourth embodiment and is a diagram illustrating behavior during operation of the permanent magnet 24 in the rotor 11. FIG. 10 is a diagram illustrating the fifth embodiment and is a diagram illustrating a deformation process of the thin portion 41 of the rotor core 21 and a press-fitting process of the permanent magnet 24. FIG. 10 is a diagram illustrating the fifth embodiment and is a diagram illustrating behavior during operation of the permanent magnet 24 in the rotor 11. It is a figure which shows Embodiment 6, and is a figure which shows the deformation | transformation process of the thin parts 41a and 41b of the rotor cores 21a and 21b, and the press injection process of the permanent magnet 24.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Airtight container, 1a Upper container, 1b Lower container, 2 Compression element, 3 Electric element, 4 Crankshaft, 4a Main shaft, 4b Secondary shaft, 5 Cylinder, 6 Main bearing, 7 Secondary bearing, 8 Eccentric part, 9 Rolling piston, DESCRIPTION OF SYMBOLS 10 Stator, 11 Rotor, 13 Stator core, 13a Tooth part, 15 Insulating member, 16 Copper wire, 17 Lead wire, 19 Glass terminal, 21 Rotor core, 22 Magnet insertion hole, 22a Protrusion, 24 Permanent magnet, 25a upper balance weight, 25b lower balance weight, 26 rivets, 27 accumulator, 28 suction connection pipe, 29 discharge pipe, 30 control unit, 32 converter unit, 33 inverter unit, 34 outlet, 35 compressor operating current detection device, 36 calculation Part, 37 hermetic compressor, 38 iron core deformation jig, 38a iron core deformation jig, 38 Iron core deformation jig, 39 Outer periphery deformation prevention jig, 40 air holes, 40a air holes, 40b air holes, 40c Projection part, 41 Thin wall part, 45 air holes, 50 Four-way valve, 51 Outdoor heat exchanger, 52 Pressure reducing device, 53 Indoor heat exchange , 54 Refrigerant circuit accumulator.

Claims (9)

A rotor iron core in which thin electromagnetic steel plates are laminated, a plurality of magnet insertion holes penetrating in the axial direction are provided, and at least one hole formed in the axial direction is provided for each of the magnet insertion holes. A rotation that is provided so as to form a thin part between the insertion hole and the thin part protrudes inward of the magnet insertion hole in a tapered shape that becomes higher toward the end in the axial direction at at least one axial direction. Child core,
A rotor, comprising: a permanent magnet that is press-fitted into the at least one portion of the thin wall portion of the magnet insertion hole and is fixed by being pressed by the portion. 2. The rotor according to claim 1, wherein at least half of the permanent magnet is pressed in the axial direction by a portion protruding at the at least one portion of the thin portion. The thin portion protrudes inside the magnet insertion hole at a plurality of axial locations including at least one location other than the axial end,
The rotor according to claim 1, wherein the permanent magnet is fixed by portions of the thin portion that protrude at the plurality of locations. A rotor iron core in which thin electromagnetic steel plates are laminated, a plurality of magnet insertion holes penetrating in the axial direction are provided, and at least one hole formed in the axial direction is provided for each of the magnet insertion holes. insertion hole a step of processing the rotor core disposed so as to form a thin portion between the, push the tapered core deformation jig tapers toward the front end into the hole, the thin Projecting the thin-walled portion into the magnet insertion hole at least in one axial direction by deforming the portion; and
Extracting the iron core deforming jig from the hole, press-fitting a permanent magnet into the at least one portion of the thin portion in the magnet insertion hole, and pressing and fixing the permanent magnet by the portion; A method for manufacturing a rotor, comprising: A rotor iron core in which thin electromagnetic steel plates are laminated, a plurality of magnet insertion holes penetrating in the axial direction are provided, and at least one hole formed in the axial direction is provided for each of the magnet insertion holes. insertion hole a step of processing the rotor core disposed so as to form a thin portion between the, push the tapered core deformation jig tapers toward the front end to the magnet insertion holes, Projecting the thin portion into the magnet insertion hole in at least one axial direction by deforming the thin portion; and
Extracting the iron core deforming jig from the magnet insertion hole, press-fitting a permanent magnet into the at least one protruding portion of the thin portion in the magnet insertion hole, and pressing and fixing the permanent magnet by the portion; And a method for manufacturing a rotor. A rotor iron core in which thin electromagnetic steel plates are laminated, a plurality of magnet insertion holes penetrating in the axial direction are provided, and at least one hole formed in the axial direction is provided for each of the magnet insertion holes. A step of processing a rotor core provided so as to form a thin portion between the insertion hole and a taper-shaped first iron core having protrusions at a plurality of side surfaces and becoming thicker toward the tip. A jig is inserted into the hole, and the protruding portion of the first iron core deforming jig is brought into contact with a plurality of axial positions including one position other than the axial end of the thin portion, toward the tip. By pushing the taper-shaped second iron core deforming jig to be thinned into the hole and deforming the thin wall portion along the shape of the side surface of the first iron core deforming jig, the thin wall portion is Projecting inside the magnet insertion hole;
The second iron core deforming jig and the first iron core deforming jig are sequentially extracted from the holes, and permanent magnets are press-fitted into the protruding portions at the plurality of locations of the thin wall portion in the magnet insertion holes. And a step of pressing and fixing the magnet by the portion. A rotor iron core in which thin electromagnetic steel plates are laminated, a plurality of magnet insertion holes penetrating in the axial direction are provided, and at least one hole formed in the axial direction is provided for each of the magnet insertion holes. a step of processing a plurality of rotor core disposed so as to form a thin portion between the insertion hole, in each of the plurality of rotor cores, tapered core which tapers toward the front end A step of pushing the deformation jig into the hole and deforming the thin portion, thereby causing the thin portion to protrude inside the magnet insertion hole at one end in the axial direction;
In each of the plurality of rotor cores, the core deformation jig is extracted from the hole, and the plurality of rotor cores are stacked with a portion protruding at the one end of the thin portion facing the same side in the axial direction. The step of disposing the protruding portion of the thin portion in the whole of the plurality of rotor cores at a plurality of axial locations including one location other than the axial end portion;
A method of manufacturing a rotor, comprising: pressing a permanent magnet into a portion of the thin portion that protrudes at the plurality of locations in the magnet insertion hole, and pressing and fixing the permanent magnet by the portion. . In a hermetic compressor in which an electric element including a stator and a rotor having a permanent magnet and a compression element driven by the electric element are housed in an airtight container,
A hermetic compressor using the rotor according to any one of claims 1 to 3 as the rotor of the electric element. A refrigeration cycle apparatus using the hermetic compressor according to claim 8 .

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