JP3306244B2 - Motor rotor for compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotor of a compressor motor.

[0002]

2. Description of the Related Art In general, the structure of a rotor of a conventional compressor motor has been disclosed in Japanese Patent Application Laid-Open No. 57-52359. In this publication, after a rotor core and a magnetic body (permanent magnet) laminated in advance in a metal pipe, the pipe, the rotor core and the magnetic body are integrally formed by die casting. Was something.

As another prior art, Japanese Patent Laid-Open No. 2-2
There was one described in Japanese Patent No. 46748. A rotor core preliminarily laminated in a metal pipe similarly to the one described in this publication,
After arranging a magnetic material (permanent magnet), these rotor cores were integrally formed by a clamp pin.
In this case, an air gap portion is provided between adjacent magnetic bodies by an air gap to ensure pole separation of the magnetic bodies, thereby improving efficiency.

Another conventional technique is disclosed in Japanese Patent Publication No.
There was also one as described in JP-A-23584.
In this publication, a magnetic material that becomes a magnetic pole is inserted (embedded) in an iron core of a rotor. In particular, the one described in this publication relates to a synchronous motor capable of self-starting.

Further, as another prior art, Japanese Patent Laid-Open No.
There was also one described in JP-A-185247.
In this publication, a rotor is formed by embedding a magnetic material in salient pole portions of a rotor core having a salient pole structure. In particular, what is described in this publication is to integrally form a rotor core in which a magnetic material is embedded and end members covering both end surfaces of the rotor core by press-fitting to a rotation shaft.

When driving such an electric motor,
For example, as shown in Japanese Patent Publication No. 5-10039,
Energize each phase of the stator winding, which is arranged with a predetermined gap around the rotor, at a predetermined timing (DC current)
Thus, a rotating magnetic field is formed around the rotor, and the rotor is rotated by the repulsion and attraction of the magnetic field with the magnetic material.

Particularly, in the above publication, the rotation position of the rotor is detected by detecting the induced voltage generated in the non-energized stator winding, and the energization switching to each of the above phases is controlled. According to such a configuration, a special Hall element or the like for detecting the rotational position of the rotor becomes unnecessary.

[0008]

Here, if the narrow path width between the slot of the rotor core into which the magnetic material is inserted and the side wall of the salient pole portion increases, the leakage flux between the magnetic poles (magnetic material) increases. The operating efficiency of the motor decreases. However, if the narrow road width is excessively reduced, there is a problem that the strength of the iron core is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and a rotor for a compressor motor which can improve operating efficiency while maintaining the strength of a rotor core. The purpose is to provide.

[0010]

SUMMARY OF THE INVENTION A rotor of a compressor motor according to the present invention has a magnetic material in a rotor core having a salient pole structure.
In the rotor of the compressor electric motor, the protrusion of the rotor core
A slot is formed in the pole, and a magnetic material is placed in this slot.
And the outer diameter of the rotor core is set to 40 mm to 7 mm.
0 / mm and L / D is 1.1 when the stacking dimension is L
And the dimension l of the magnetic material in the lamination direction is defined as the lamination dimension L.
Assuming that the thickness of the magnetic material is t, t / l is set to 0.1.
08 and smaller than the slot.
The narrow path width between the salient pole side walls is 0.3mm or more and less than 0.5mm
And a praseodymium-based magnet as the magnetic material,
Is nickel plated or aluminum ion plated on the surface
Using neodymium magnets coated or coated with resin
Things.

According to a second aspect of the present invention, there is provided a rotor for a compressor motor, wherein a cross section of the slot and the magnetic body is rectangular.
Shape, arc shape of predetermined width, or one side is opposed by a straight line
A magnetic material is placed in this slot with one side of an arc.
It is to establish.

According to a third aspect of the present invention, the rotor of the compressor motor has a thickness of 0.3 mm to 0.7 mm.
mm rotor plates are stacked and caulked, or
The structure is fixed by welding and a magnetic material is inserted.
After providing end members made of non-magnetic material on both end surfaces in the state
With a rivet material that penetrates the whole
is there.

According to a fourth aspect of the present invention, there is provided a rotor for a compressor motor, wherein the rotor core has a thickness in which a through hole is formed.
Lamination of multiple 0.3mm-0.7mm rotor iron plates
Caulking or fixing by welding
With a magnetic body inserted, and made of a non-magnetic material on both end faces.
After the end face member is provided, it is inserted into the through hole and the whole is
It is caulked with a rivet material that penetrates.

According to a fifth aspect of the present invention, there is provided a rotor for a compressor motor , wherein a hole forming an oil passage is formed in the rotor core.
It was drilled.

[0015]

According to the rotor of the compressor motor of the present invention, a slot is formed in the salient pole portion of the rotor core, a magnetic body is disposed in the slot, and the outer diameter of the rotor core is reduced by 40 mm.
mm to 70 mm, and the width of the narrow path between the slot and the side wall of the salient pole portion is set to 0.3 mm or more and less than 0.5 mm, thereby reducing the leakage magnetic flux between the magnetic poles while maintaining the strength of the rotor core. The operation efficiency of the motor can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional side view of a compressor C to which the present invention is applied. In this figure, reference numeral 1 denotes a closed container, in which an electric motor (brushless DC motor) 2 is housed on the upper side, and a compression element 3 driven by the motor 2 is housed on the lower side. The airtight container 1 is obtained by storing the electric motor 2 and the compression element 3 in a preliminarily divided into two parts and then sealing them by high frequency welding or the like.

The electric motor 2 comprises a stator 4 fixed to the inner wall of the closed casing 1 and a rotor 5 rotatably supported inside the stator 4 about a rotation shaft 6. . The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.

The compression element 3 has a first rotary cylinder 9 and a second rotary cylinder 10 partitioned by an intermediate partition plate 8. Eccentric portions 11 and 12 that are driven to rotate by the rotating shaft 6 are attached to the cylinders 9 and 10, respectively. The eccentric portions 11 and 12 are 180 degrees out of phase with each other.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate in the cylinder by rotation of the eccentric portions 11 and 12, respectively. 15,
Reference numeral 16 denotes a first frame and a second frame, respectively. The first frame 15 forms a closed compression space of the cylinder 9 between the first frame 15 and the partition plate 8. A closed compression space of the cylinder 10 is formed between the partition 10 and the partition plate 8. The first frame 15 and the second frame 16 are provided with bearings 17 and 18 that rotatably support the lower part of the rotating shaft 6.

Reference numerals 19 and 20 denote discharge mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively. The cylinder 9 and the discharge muffler 19 communicate with each other through a discharge hole (not shown) provided in the first frame 15, and the cylinder 10 and the discharge muffler 20 also communicate with the second frame 1.
6 through a discharge hole (not shown).
Reference numeral 21 denotes a bypass pipe provided outside the sealed container 1 and communicates with the inside of the discharge muffler 20.

Reference numeral 22 denotes a discharge pipe provided on the closed vessel 1, and reference numerals 23 and 24 denote suction pipes connected to the cylinders 9 and 10, respectively. Reference numeral 25 denotes a sealed terminal for supplying electric power to the stator winding 7 of the stator 4 from outside the sealed container 1 (lead wires connecting the sealed terminal 25 and the stator winding 7 are shown in the drawing). Zu).

FIG. 2 is a partially longitudinal side view of the rotor 5 shown in FIG. 1, and FIG. 3 is a plan view (before press-fitting the rotary shaft 6). In each of the figures, reference numeral 26 denotes a rotor core, in which a plurality of rotor iron plates 27 punched into a shape as shown in FIG. 4 from an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm are laminated, caulked together, and integrally formed. It is laminated. Iron plate 27 for each rotor
.. may be integrated by welding the outer peripheral surface without depending on caulking.

The rotor iron plate 27 is stamped from an electromagnetic steel plate so as to form salient pole portions 28 to 31 forming four poles as shown in FIG. It is a cutout portion provided so that a salient pole portion is formed between the portions 28 to 31. At this time, each salient pole part 28-3
The outer diameter D between the vertices of 1 is in a range of 40 mm to 70 mm, and is, for example, 50 mm in the embodiment.

Reference numerals 41 to 44 denote slots for press-fitting a magnetic body 45 (permanent magnet) to be described later.
In the outer peripheral side of the rotor iron plate 27, a hole is formed concentrically along the axial direction of the rotating shaft 6. And the salient pole portions 28-3 adjacent to the slots 41-44, respectively.
The width d of the narrow path between the side walls 1 is 0.3 mm or more and less than 0.5 mm.

As described above, the outer diameter D of the rotor iron plate 27, that is, the rotor iron core 26 is set to 40 mm to 70 mm, and the narrow path width d between the slots 41 to 44 and the side walls of the salient pole portions 28 to 31 is set. Is not less than 0.3 mm and less than 0.5 mm,
While maintaining the strength of the rotor core 26, the magnetic poles (magnetic material 4
5) It is possible to increase the operating efficiency of the electric motor 2 by reducing the leakage magnetic flux between the two.

Reference numeral 46 denotes a hole formed at the center of the rotor iron plate 27, in which the rotating shaft 6 is shrunk. 47-50
Is a through hole having a size and a shape through which rivets 51 to 54 for caulking, which will be described later, are passed. The through holes are formed inside the slots 41 to 44 correspondingly. Numerals 56 to 59 are caulking portions for caulking and fixing the respective iron plates 27 for the rotor, and each slot 4 is substantially concentric with the through holes 47 to 50.
It is formed between 1 and 44. Further, reference numerals 61 to 64 are holes for forming oil passages formed inside the caulking portions 56 to 59.

After laminating a plurality of rotor iron plates 27,..., They are caulked together at the caulking portions 56 to 59 to form a rotor core 26 as shown in the side view of FIG. . At this time, the outer diameter of the rotor core 26 is the outer diameter D (50 mm) of the rotor iron plate 27 described above,
The lamination dimension L in the direction of the rotating shaft 6 is, for example, 40 mm. Here, the ratio L / D of the outer diameter D to the dimension L is 1.1.
It is formed to be smaller, and is 0.8 in the embodiment. That is, the dimension L in the direction of the rotating shaft 6 is set to be small.

On the other hand, the magnetic body 45 is made of a rare earth magnet material such as a praseodymium magnet or a neodymium magnet whose surface is plated with nickel.
Its outer shape is rectangular as a whole with a rectangular cross section as shown in FIG. The thickness t of the magnetic body 45 is, for example, 2.65 mm, and the dimension 1 in the direction of the rotation axis 6 is 40 mm, which is the same as the dimension L described above. Here, the thickness t
And the dimension t / l of the dimension l is set to be smaller than 0.08. In the embodiment, the ratio is set to 0.066.
Nos. 1 to 44 are sized so that the magnetic body 45 is press-fitted exactly).

FIG. 7 shows a magnetic body 45 constituting a field.
Shows the demagnetization curves of the phyllite-based magnet material as a permanent magnet and the rare-earth-based magnet material as described above, the vertical axis represents the magnetic flux density B, and the horizontal axis represents the coercive force Hc. In the figure,
In the case of a general ferrite magnet material indicated by a broken line,
The solid line shows the case of a general rare earth magnet material.
1 is + 25 ° C. and T2 is + 150 ° C.

As can be seen from the figure, the rare earth magnet material is
Both the residual magnetic flux density Br and the coercive force Hc are larger than the ferrite-based magnet material, and the magnetic energy product is extremely large. Therefore, a necessary gap magnetic flux number can be secured even if the magnet area is reduced, and a required output can be obtained.

Since the rotary shaft 6 is of a cantilever type supported by the lower bearings 17 and 18 as described above,
When the dimension of the rotor 5 in the direction of the rotating shaft 6 is increased, as described above, a large run-out is generated, especially at the time of high-speed rotation, so that vibration and noise are increased, and reliability and operation efficiency are both reduced.

However, in the embodiment, since the magnetic material 45 provided in the laminated rotor core 26 is a rare earth magnet material, the required magnetic material 45 is required compared to the case of using a conventional ferrite magnet material. Rotor core 2 while maintaining output
6, the size of the rotor 5 can be reduced.
It is possible to reduce the vibration and noise generated by the runout, thereby improving reliability and operation efficiency.

In particular, the diameter D of the rotor core 26 and the rotation axis 6
Since the ratio L / D to the dimension L in the direction is smaller than 1.1 and the reduction in the size of the rotor core 26 is exclusively used to reduce the size L in the direction of the rotation shaft 6, the diameter of the rotor core 26 or It becomes possible to eliminate the necessity of changing the manufacturing equipment and the like due to the change in the outer diameter of the sealed container 1 of the compressor C. Further, the ratio t / (t) of the thickness t of the magnetic body 45 to the dimension l in the direction of the rotating shaft 6
Since l is smaller than 0.08, it is possible to eliminate or minimize the rise in cost due to the use of the relatively expensive rare earth magnet material.

Reference numerals 66 and 67 denote flat end members which are attached to the upper and lower ends of the rotor core 26. The end members 66 and 67 are made of a non-magnetic material such as aluminum or resin material and have substantially the same shape as the rotor iron plate 27. Is molded. The outer diameters of the end face members 66 and 67 are smaller than the outer diameter D of the rotor core 26. Further, through holes 71 to 74 are formed in the end face members 66 and 67 at positions corresponding to the through holes 47 to 50, and holes 76 and 77 to 80 are formed in positions corresponding to the holes 46 and 61 to 64. Has been established.

Further, holes 76 of the end face members 66 and 67 are provided.
(Inner diameter) is made larger than the hole 46 of the rotor iron plate 27 (inner diameter of the rotor core 26), and the end face members 66, 67
Of the through holes 71 to 74 are larger than the through holes 47 to 50 of the iron plate 27 for the rotor.

The slots 41 to 41 of the rotor core 26 are
After press-fitting the magnetic body 45 into 44, the upper and lower end members 66 and 67 are set to close the upper and lower portions of the slots 41 to 44. In this state, the through holes 47 to 50 and 71 to 74 penetrate the rotor core 26 and the end members 66 and 67 along the rotation axis 6 direction. Also, holes 61 to 64 and 77 to 80
Penetrates through the rotor core 26 and the end face members 66 and 67. Thereafter, the rivets 51 to 54 are inserted into the respective through holes 47 to
After the rotor 5 is integrally formed by caulking up and down, the rotating shaft 6 is press-fitted into the hole 46 and the rotor 5 is fixed to the rotating shaft 6 by shrink fitting. In addition, A is a balance weight, and the rivet 5 together with the upper end face member 66.
1 is fixed to the rotor core 26.

As described above, since the rotor 5 is integrally formed before being pressed into the rotating shaft 6, the dimensional accuracy of the rotor 5 can be maintained at a high level. Further, since the end conductors 66 and 67 made of a non-magnetic material are used for integration, the secondary conductor formed by a conventional metal pipe or die casting is eliminated, and eddy current can be prevented from being generated by these configurations.

Further, the outer diameter of the end members 66, 67 is made smaller than the outer diameter D of the rotor core 26, and the end members 6
The holes 76 (inner diameter) of 6, 67 are inserted into the holes 4 of the iron plate 27 for the rotor.
6 (the inner diameter of the rotor core 26), the outer diameter or the inner diameter thereof may protrude outside or inside the rotor core 26 when the end face members 66 and 67 are assembled to the rotor core 26. Disappears. In addition, the end face member 6
The diameter of the through holes 71 to 74 of the iron plate 2 for the rotor
Since the through holes 47 to 50 are larger than the through holes 47 to 50, even if the positions of the through holes 71 to 74 slightly deviate from the through holes 47 to 50, there is no problem in passing the rivets 51 to 54 through.

Therefore, the processing tolerance of the inner and outer diameters of the end face members 66 and 67 and the diameter of the through holes 71 to 74 can be reduced. Further, when the end face members 66 and 67 and the rotor core 26 are assembled, it is easy to adjust the inner diameter, the outer diameter, and the dimensions of the through holes.

FIG. 8 shows a state of a magnetic field formed in the rotor core 26 by each magnetic body 45. At this time, as shown by a broken line in the figure, between the magnetic bodies (magnetic poles) 45, 45 press-fitted into the adjacent slots 42, 43, for example,
A substantially concentric magnetic field is formed around the notch 33 (the same applies to other adjacent magnetic bodies 45).

On the other hand, the through holes 47 to 50 are provided for the respective magnetic members 45.
.. the through-holes 47 to 50, which are gaps, are displaced from the center of the magnetic path formed between the adjacent magnetic bodies 45 to the peripheral part because the holes are bored corresponding to the inside of ,
The magnetic resistance of such a magnetic field becomes difficult. Therefore, disturbance of the magnetic field is less likely to occur, and the adverse effects of the through holes 47 to 50 on the motor 2 can be minimized, and the output of the motor can be improved.

Since the caulked portions 56 to 59 and the holes 61 to 64 of the rotor iron plates 27 are arranged between the through holes 47 to 50, the caulked portions 56 to 59 are formed on the outer peripheral side of the rotor core 26. Can be located. Therefore,
The fixing strength of the rotor iron plates 27 by caulking is improved. Here, the caulking portions 56 to 59 and the holes 61 to 64 are moved to the center of the magnetic field by the above arrangement,
The caulked portions 56 to 59 and the holes 61 to 64 of the iron plate 27 for the rotor
Has a minimal gap as compared with the through holes 47 to 50, so that the influence on the magnetic field is small.

Next, the operation of the electric motor 2 according to the present invention will be described with reference to FIGS. Figure 10
FIG. 12 is a connection diagram of the stator winding 7 of the stator 4, and FIGS. 13 and 14 are plan views of the stator 4. Stator winding 7
Is composed of three-phase windings of a U-phase, a V-phase, and a W-phase in order from the outside.
As shown in FIG. 3 and FIG. 14, U1 to U4, V1 to V4, and W1 to W4 are provided around the rotor 5 separately.

Then, by a control device (not shown) such as an inverter device including a plurality of switching elements such as transistors, the U-phase, V-phase and W-phase of the stator winding 7 are patterned as shown in FIG. DC current is applied in the order of 1 to 6. Then, each pattern 1 to pattern 6
The distribution of the magnetic field (synthetic magnetic field) on the inner periphery of the stator 4 when the electric current is supplied is shown in the connection diagrams of FIGS.

Incidentally, the pattern numbers in the respective drawings coincide with each other.
13 and FIG. 14 correspond to N in FIG.
0 to N in FIG. In the embodiment, the magnetic material 45 of the slots 41 and 43 is N
The magnetic material 45 of the poles and slots 42 and 44 is an S-pole, and the control unit further presses the salient poles 28 to 31 (the magnetic material 45 therein) of the rotor 5 by the repulsive action of the same polarity and the stator. It is assumed that the winding 7 is energized.

When the pattern shifts from pattern 1 to pattern 2 in FIG. 9, the magnetic field rotates by 30 degrees. Accordingly, when the pattern proceeds from pattern 1 to pattern 6, the magnetic field rotates 180 degrees, and as shown in the connection diagrams of FIGS. 10 to 12, the composite magnetic field exists at 360 degrees for two periods. Due to the repulsion between the combined magnetic field and the magnetic field generated from each magnetic body 45, the rotor 5 is adjusted to a speed at which the voltage applied to the stator winding 7 and the load balance (500 rpm to 10 rpm by changing the applied voltage).
As shown in FIG. 4, the rotor 5 rotates clockwise in FIG.
Rotate 0 degrees). The rotation of the rotor 5 causes the rotation shaft 6 to rotate, whereby the eccentric portions 11 and 12 rotate, whereby the first and second rollers 13 and 14 rotate to exert a compressing action.

In the embodiment, the magnetic member 45 and the slot 4
Although 1 to 44 are rectangular in cross section, the present invention is not limited to this, and may be an arc shape having a predetermined width or an arc shape in which one side is straight and the opposite side is arc.

[0048]

As described in detail above, according to the present invention, a slot is formed in the salient pole portion of the rotor core, a magnetic material is disposed in the slot, and the outer diameter of the rotor core is reduced to 40 m.
m to 70 mm, and the narrow path width between the slot and the side wall of the salient pole portion is set to 0.3 mm or more and less than 0.5 mm, thereby reducing the leakage magnetic flux between the magnetic poles while maintaining the strength of the rotor core. The operation efficiency of the motor can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a compressor to which the present invention is applied.

FIG. 2 is a partial longitudinal side view of a rotor of the present invention.

FIG. 3 is a plan view of the rotor of the present invention.

FIG. 4 is a plan view of a rotor iron plate constituting the rotor of the present invention.

FIG. 5 is a side view of a rotor core constituting the rotor of the present invention.

FIG. 6 is a perspective view of a magnetic body constituting the rotor of the present invention.

FIG. 7 is a diagram showing a demagnetization curve of a permanent magnet used as a magnetic body.

FIG. 8 is a plan view of a rotor core constituting the rotor of the present invention.

FIG. 9 is a timing chart showing an energization pattern to a stator winding.

FIG. 10 is a connection diagram of stator windings showing a distribution of a magnetic field on the inner periphery of the stator in the energization patterns 1 and 2 of FIG. 9;

11 is a connection diagram of stator windings showing a distribution of a magnetic field on the inner circumference of the stator in energization patterns 3 and 4 of FIG. 9;

12 is a connection diagram of a stator winding showing a distribution of a magnetic field on the inner circumference of the stator in energization patterns 5 to 6 of FIG. 9;

FIG. 13 is a plan view of the stator showing the distribution of the magnetic field on the inner circumference of the stator in the energization patterns 1 to 4 of FIG. 9;

14 is a plan view of the stator showing the distribution of the magnetic field on the inner circumference of the stator in the energization patterns 5 to 6 of FIG. 9;

[Explanation of symbols]

 C Compressor 2 Motor 4 Stator 5 Rotor 6 Rotary shaft 7 Stator winding 26 Rotor core 27 Iron plate for rotor 28-31 Salient pole 41-44 Slot 45 Magnetic body 47-50 Through-hole 56-59 Part 66, 67 End member

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Keishiro Igarashi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kazuhiko Arai 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (56) References JP-A-5-304736 (JP, A) JP-A-5-304737 (JP, A) JP-A-4-125907 (JP, A) JP-A-4 −355636 (JP, A) WO 92/7409 (WO, A1) WO 94/5075 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 1/27 501 H02K 7 / 14 H02K 15/03 H02K 29/00 H02K 21/00

Claims (5)

(57) [Claims] In a rotor of a compressor motor having a magnetic material in a rotor core having a salient pole structure, a slot is formed in a salient pole portion of the rotor core, and a magnetic material is disposed in the slot. And the outer diameter of the rotor core is 40 mm or more.
70 mm, and L / D is 1.1 when the lamination size is L.
And the dimension l of the magnetic material in the laminating direction is
And the thickness of the magnetic material is t, t / l is
A dimensional relationship smaller than 0.08 , wherein a narrow path width between the slot and the side wall of the salient pole portion is 0.3 mm or more and 0.5 mm or more.
A rotor for a compressor motor, wherein a praseodymium-based magnet or a neodymium-based magnet whose surface is coated with nickel plating, aluminum ion plating, or resin is used as the magnetic material. 2. The cross-sectional shape of the slot and the magnetic body is long.
Square shape, arc shape of predetermined width, or one side is straight and opposed
The magnetic material is inserted in this slot as one side
2. The compressor according to claim 1, further comprising:
Motivation rotor. 3. The rotor core has a thickness of 0.3 mm or more.
Laminate multiple 0.7mm iron plates for rotor, caulking,
Or by welding, and insert a magnetic material.
The end face members made of non-magnetic material are installed on both end faces
After caulking, it was caulked with rivet material penetrating the whole
The rotor for a compressor electric motor according to claim 1 or 2, wherein: 4. The rotor core has a thickness dimension having a through hole.
Lamination of multiple iron plates for rotors with a method of 0.3 mm to 0.7 mm
Caulking or fixing by welding
With a magnetic body inserted, and made of a non-magnetic material on both end faces.
After the end face member is provided, it is inserted into the through hole and the whole is
It is characterized by being caulked with piercing rivet material
A rotor for a compressor motor according to claim 1 . 5. An oil passage is formed in the rotor core.
The rotor for a compressor motor according to any one of claims 1 to 4, wherein a hole is formed .