JPH07236240A - Rotor for compressor motor - Google Patents

Abstract

PURPOSE:To suppress adverse effect of a through hole for caulking on a motor by making the through hole for caulking on the inside of a hole for inserting a magnetic body constituting a pole and deviating the through hole from a magnetic path formed across adjacent poles thereby preventing the magnetic resistance from increasing. CONSTITUTION:A plurality of iron plates 27 for rotor are laminated, rivets are inserted into respective through holes 47-50 and then the laminate is caulked integrally along with a end face member thus constituting a rotor core 26. The through holes 47-50 are made on the inside of respective magnetic bodies 45 at the peripheral part of a magnetic path formed between the adjacent magnetic bodies 45 so that the through holes do not contribute to the magnetic resistance of the magnetic path. Since the caulking parts 56-59 for securing the iron plates 27 mutually and the holes 61-64 for oil path are extremely small gaps as compared with the through holes 47-50, influence thereof on the magnetic field is low. This structure enhances the motor output while minimizing adverse effect of the through holes 47-50 on the motor.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a rotor of an electric motor for a compressor of this type, particularly an electric motor rotor called a brushless DC motor is
For example, the application was constructed as shown in FIG. 4 (C) of Japanese Patent Application No. 5-138893 filed previously by the applicant. That is,
In the conventional rotor, a plurality of rotor iron plates are laminated and caulked and fixed to form a rotor core, and four magnetic poles (in the case of four poles) are formed along the outer peripheral side of the rotor core. A magnetic body (permanent magnet) is inserted, and a notch is formed between the magnetic bodies on the outer peripheral surface of the rotor core to form a salient pole portion, thereby preventing a magnetic flux from being short-circuited.

Further, a through hole is formed in the rotor iron plate of the rotor core for caulking and fixing the upper and lower non-magnetic end face members and the like, and a rivet is used in this through hole to separate the end face member and oil. The discs, etc. were fixed to the rotor core by caulking.

[0004]

However, in the conventional rotor, since the through hole is formed inside the notch, that is, between the magnetic bodies, when the magnetic pole has four or more poles, the adjacent magnetic body ( A through hole exists in the magnetic path formed between the magnetic poles. Therefore, there is a problem that the magnetic resistance is increased in the through hole portion and the output of the electric motor is reduced.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and an object thereof is to provide a rotor of a compressor electric motor in which the adverse effect of a through hole for caulking and fixing is reduced. To do.

[0006]

A rotor 5 of a compressor electric motor 2 according to a first aspect of the present invention comprises a rotor core 26 in which a plurality of rotor iron plates 27 are laminated, and an outer periphery of the rotor core 26. At least 4 provided along the axial direction of the rotating shaft 6 on the side
The end face member 6 including the above insertion holes 41 to 44 and the magnetic body 45 inserted into these insertion holes 41 to 44, provided on both end faces of the rotor core 26, and closing the insertion holes 41 to 44.
6, 67, both end surface members 66, 67, and the rotor core 26 along the direction of the rotation axis 6, and a plurality of through holes 47 to 50 provided inside the insertion holes 41 to 44 and a through hole 47 to.
It is provided with rivets 51 to 54 that integrally form both end surface members 66 and 67 and the rotor core 26 by using 50.

Further, the compressor electric motor 2 according to the second aspect of the present invention.
In addition to the above, the rotor 5 of FIG.
9 is arranged substantially concentrically with the through holes 47 to 50 and between the insertion holes 41 to 44.

Further, the compressor electric motor 2 according to the third aspect of the present invention.
In addition to the above, the rotor 5 of FIG.
6 to 59 are provided on the rotary shaft 6 side.

Furthermore, the rotor 5 of the compressor motor 2 according to the invention of claim 4 is provided with a balance weight A fixed by rivets 51 to 54 in addition to the above.

[0010]

According to the rotor 5 of the compressor motor 2 of the present invention, the caulking fixing through holes 47 to 50 are inserted into the insertion holes 41 to 44 into which the magnetic members 45 forming the magnetic poles are inserted. Since the through holes 47 to 50 are detached from the magnetic path formed between the adjacent magnetic bodies (magnetic poles) 45, it is possible to prevent an increase in magnetic resistance as in the conventional case. Therefore, it is possible to minimize the adverse effect of the through holes 47 to 50 on the electric motor 2 and improve the electric motor output.

Particularly, if the caulked portions 56 to 59 of the rotor iron plate 27 are arranged substantially concentrically with the through holes 47 to 50 and between the respective insertion holes 41 to 44 as in the second aspect of the present invention, the rotation is improved. When the child iron core 26 is formed by caulking and fixing a plurality of rotor iron plates 27, the caulking portions 56 to 59 are formed.
Can be positioned relatively on the outer peripheral side, and the fixing strength is improved. The caulking portion 56 of the iron plate 27 for the rotor
59 is usually extremely smaller than the through holes 47 to 50,
Since a gap is scarcely formed, the influence on the magnetic field is small.

Further, when a plurality of holes penetrating the end face member and the rotor core are provided on the rotary shaft side of the caulking portion as in the third aspect of the invention, the oil can be smoothly moved inside the compressor. .

Further, if the balance weight is fixed by the rivets integrally forming the end surface member and the rotor core as in the invention of claim 4, a special fixing tool for fixing the balance weight is not required, and the number of parts is increased. Can be reduced.

[0014]

Embodiments of the present invention will be described below in detail 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 the 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 which is rotationally driven by the electric motor 2 is housed on the lower side. The hermetically sealed container 1 is a container that is previously divided into two parts, and the electric motor 2 and the compression element 3 are housed therein, and then hermetically sealed by high frequency welding or the like.

The electric motor 2 is composed of a stator 4 fixed to the inner wall of the hermetic container 1 and a rotor 5 supported inside the stator 4 so as to be rotatable around a rotation shaft 6. . The stator 4 is provided with a stator winding 7 that gives a rotating magnetic field to the rotor 5.

The compression element 3 comprises a first rotary cylinder 9 and a second rotary cylinder 10 which are partitioned by an intermediate partition plate 8. Eccentric parts 11 and 12 which are rotationally driven by the rotary shaft 6 are attached to the respective cylinders 9 and 10, and the eccentric parts 11 and 12 are out of phase with each other by 180 degrees in phase.

Reference numerals 13 and 14 respectively denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate inside the cylinders by rotation of the eccentric portions 11 and 12, respectively. 15,
Reference numerals 16 are a first frame body and a second frame body, respectively. The first frame body 15 forms a compression space in which the cylinder 9 is closed between the first frame body 15 and the partition plate 8, and the second frame body 16 is the same. A closed compression space of the cylinder 10 is formed between the partition 10 and the partition plate 8. The first frame body 15 and the second frame body 16 respectively include bearing portions 17 and 18 that rotatably support the lower portion of the rotary shaft 6.

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

Reference numeral 22 is a discharge pipe provided on the closed container 1, and 23 and 24 are suction pipes connected to the cylinders 9 and 10, respectively. Further, reference numeral 25 is a closed terminal for supplying electric power from the outside of the closed container 1 to the stator winding 7 of the stator 4 (the lead wire connecting the closed terminal 25 and the stator winding 7 is not shown). No).

FIG. 2 is a partially longitudinal side view of the rotor 5 shown in FIG. 1, and FIG. 3 is a plan view (state before being pressed into the rotary shaft 6). In each drawing, 26 is a rotor core, and a plurality of rotor iron plates 27 punched in a shape as shown in FIG. 4 from electromagnetic steel plates having a thickness of 0.3 mm to 0.7 mm are laminated and caulked together to be integrated. It is stacked.

The rotor iron plate 27 is punched out from an electromagnetic steel plate so that salient pole portions 28 to 31 forming quadrupole magnetic poles are formed as shown in FIG. 4, and 32 to 35 are salient poles. It is a notch provided so that a salient pole portion is formed between the portions 28 to 31. At this time, each salient pole portion 28-3
The outer diameter D between the vertices of 1 is in the range of 40 mm to 70 mm, and is 50 mm in the embodiment.

Reference numerals 41 to 44 are insertion holes for press-fitting a magnetic body 45 (permanent magnet) which will be described later, and each salient pole portion 28 to 3 is provided.
Corresponding to No. 1, on the outer peripheral side of the rotor iron plate 27, the rotor iron plate 27 is concentrically provided along the axial direction of the rotary shaft 6. The narrow path width d between the sidewalls of the salient pole portions 28 to 31 adjacent to the insertion holes 41 to 44 is set to 0.3 mm or more and less than 0.5 mm.

Numeral 46 is a hole formed in the center of the rotor iron plate 27 to shrink-fit the rotating shaft 6. 47-50
Is a through hole having a size and shape through which rivets 51 to 54 for crimping, which will be described later, are inserted, and is formed corresponding to the inside of each of the insertion holes 41 to 44. Reference numerals 56 to 59 are caulking portions for caulking and fixing the rotor iron plates 27 to each other, and are formed between the insertion holes 41 to 44 substantially concentrically with the through holes 47 to 50. Further, 61 to 64 are each caulking portion 56.
It is a hole for forming an oil passage bored inside 59 to 59 (on the side of the rotating shaft 6).

A plurality of iron plates 27 for rotors are laminated, and the rotor iron cores 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 above-described rotor iron plate 27, and the stacking 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 and the dimension L is 1.
It is formed to be smaller than 1, 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.
The outer shape is rectangular 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.
And Here, the ratio t / l of the thickness t and the dimension l is 0.
It is formed to be smaller than 08, and is 0.06 in the embodiment.
6 (note that each of the insertion holes 41 to 44 corresponds to the magnetic body 45).
Has been sized to be press-fitted exactly).

Reference numerals 66 and 67 denote flat plate-shaped end face members to be attached to the upper and lower ends of the rotor core 26, which are made of a non-magnetic material such as aluminum or a resin material to have a shape substantially the same as the rotor iron plate 27. There is. The outer diameters of the end surface members 66 and 67 are made equal to or slightly smaller than the outer diameter D of the rotor core 26. Further, through holes 71 to 74 are formed in the end surface members 66 and 67 at positions corresponding to the through holes 47 to 50, and holes 76 are provided at positions corresponding to the holes 59 and 61 to 64.
And 77 to 80 are perforated.

Then, the insertion holes 41 to 4 of the rotor core 26 are inserted.
After press-fitting the magnetic body 45 into the inside 4, the upper and lower end face members 6
6 and 67 are set to close the top and bottom of the insertion holes 41 to 44. In this state, the through holes 47 to 50 and 71 to 74 penetrate the rotor core 26 and the end surface members 66 and 67 along the direction of the rotation axis 6. The holes 61 to 64 and 77 to 80 penetrate the rotor core 26 and the end surface members 66 and 67. After that, the rivets 51 to 54 are inserted into the through holes 47 to 50 and 71 to 74, and the upper and lower parts are caulked to be integrally formed. Incidentally, A is a balance weight, which is fixed to the rotor core 26 by the rivets 51 together with the upper end surface member 66.

When a direct current is applied to the stator winding 7 of the stator 2 having the above-described structure, the rotor 5 is applied to the stator winding 7 by the repulsion / suction action with the magnetic field generated by the magnetic body 45. Speed at which voltage and load are balanced (for example, 500 rpm to 10000 rpm by changing applied voltage)
It is variable within the range of 4). The rotation of the rotor 5 causes the rotation shaft 6 to rotate, which causes the eccentric portions 11 and 12 to rotate, whereby the first and second rollers 13 and 14 rotate to exert a compression action.

At this time, the state of the magnetic field formed in the rotor core 26 by each magnetic body 45 is shown in FIG. 7 shows a plan view of the rotor core 26. At this time,
A magnetic field (magnetic poles) 45, 45 that is press-fitted into, for example, the adjacent insertion holes 42, 43 forms a substantially concentric magnetic field centered on the notch 33, as indicated by the broken line in the figure (others). The same applies between adjacent magnetic bodies 45, 45).

On the other hand, according to the present invention, since the through holes 47 to 50 are formed corresponding to the insides of the magnetic members 45 ...
The through holes 47 to 50, which are gaps, are adjacent to each other in the magnetic body 4.
The magnetic path formed between 5 and 45 deviates from the central portion to the peripheral portion, and it becomes difficult for the magnetic field to have a magnetic resistance. Therefore, the disturbance of the magnetic field unlike the conventional one is less likely to occur, and the through hole 47
It is possible to improve the electric motor output by minimizing the adverse effect of .about.50 on the electric motor 2.

Further, since the caulking portions 56 to 59 and the holes 61 to 64 of the iron plates 27 for rotors are arranged between the through holes 47 to 50, the caulking portions 56 to 59 are provided on the outer peripheral side of the rotor iron core 26. Will be able to be located. Therefore,
The fixing strength of the rotor iron plate 27 ... by caulking is improved. Here, although the caulking portions 56 to 59 and the holes 61 to 64 move to the central portion of the magnetic field by the above arrangement,
Crimped portions 56 to 59 and holes 61 to 64 of the iron plate 27 for the rotor
Is a very small gap as compared with the through holes 47 to 50, and therefore has little effect on the magnetic field.

Although the present invention is applied to a rotor having four-pole magnetic poles in the embodiments, the present invention is not limited to this.
The present invention is also effective for rotors of electric motors with four or more poles. In the embodiment, the caulking portions 56 to 59 are used to form the iron plate 2 for the rotor.
7 are fixed by caulking each other, but not limited thereto, the rotor iron plate 27 is laminated and fixed by welding, and the rotor core 26 is fixed.
The present invention is also effective in the case where the upper and lower end surface members 66 and 67 are caulked and fixed to the rotor core 26 by the rivets 51 to 54.

[0033]

As described above in detail, in the present invention, the through hole for caulking and fixing is provided inside the insertion hole into which the magnetic body constituting the magnetic pole is inserted. The through hole is removed from the magnetic path formed as a result, and the conventional increase in magnetic resistance can be prevented. Therefore, it is possible to minimize the adverse effect of the through holes on the electric motor and to improve the electric motor output.

In particular, if the caulking portion of the rotor iron plate is arranged substantially concentrically with the through hole and between the respective insertion holes as in the second aspect of the invention, the rotor iron core is made up of a plurality of rotor iron plates. In the case of the crimp fixing, the crimp portion can be positioned relatively on the outer peripheral side, and the fixing strength is improved.

Further, when a plurality of holes penetrating the end face member and the rotor core are provided on the rotary shaft side of the caulking portion as in the third aspect of the invention, the oil can be smoothly moved inside the compressor. .

Furthermore, if the balance weight is fixed by the rivets integrally forming the end surface member and the rotor core as in the invention of claim 4, no special fixing tool for fixing the balance weight is required, and the number of parts is reduced. Can be reduced.

[Brief description of drawings]

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

FIG. 2 is a partially longitudinal side view of the 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 that constitutes the rotor of the present invention.

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

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

FIG. 7 is a plan view of a rotor core that constitutes the rotor of the present invention.

[Explanation of symbols]

 C compressor 2 electric motor 4 stator 5 rotor 6 rotary shaft 26 rotor core 27 rotor iron plate 45 magnetic material 47-50 through hole 56-59 caulking part

Front page continued (72) Inventor Keijiro Igarashi 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Kazuhiko Arai 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A rotor core in which a plurality of rotor iron plates are laminated, at least four or more insertion holes provided on the outer peripheral side of the rotor core along the axial direction of the rotary shaft, and these insertion holes In a rotor composed of a magnetic body to be inserted, end face members provided on both end faces of the rotor core to close the insertion hole, and the end faces members and the rotor core are pierced along the rotation axis direction to insert the rotor. A rotor for a compressor electric motor, comprising: a plurality of through holes provided inside the holes; and rivets that integrally form the both end surface members and the rotor core by using the through holes. 2. The rotor iron plate is characterized in that a caulking portion for laminating the rotor iron plates on each other is arranged substantially concentric with the through hole and between the respective insertion holes. Item 2. A rotor of an electric motor for a compressor according to Item 1. 3. The rotor for a compressor electric motor according to claim 2, wherein the rotor is provided with a plurality of holes penetrating both end surface members and a rotor core on the rotary shaft side of the caulking portion. . 4. The rotor for a compressor electric motor according to claim 3, wherein the rotor includes balance weights fixed by the rivets.