JPH06197483A - Rotor of electric motor for compressor - Google Patents

Abstract

PURPOSE:To prevent an eddy current from being generated and to prevent a drop in the dimensional accuracy of a rotor by a method wherein, before the rotor is force-fitted to a rotating shaft, the rotor is constituted integrally as well as a protective metal pipe and a secondary conductor by a die casting are eliminated. CONSTITUTION:A first edge member 30 which is attached to one end of a rotor core 28, balancing weights 33, 34, 35, 36 and bosses 31, 32 are constituted integrally of a nonmagnetic metal die-cast material, a drawn and molded material, a resin material or the like. Also a second edgemember 38 which is attached to the other end of the rotor core 28 is constituted of a nonmagnetic metal die casting or the like in the same manner as the first edge member 30. A magnetic material 29 is force-fitted to the rotor core 28, the first edge member 30 and the second edge umber 38 are set, the members are welded by a welding part 37, and a rotor is constituted. Thereby, the operating efficiency of an electric motor can be increased.

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 Generally, as a conventional rotor structure of a compressor electric motor, there is a structure described in JP-A-57-52359. In this publication, a rotor core and a magnetic material, which are laminated in advance in a metal pipe, are arranged, and then the pipe, the rotor core and the magnetic material are integrally formed by die casting. .

Another conventional technique is Japanese Patent Laid-Open No. 2-2.
There was a thing as described in 46748 gazette. The one described in this publication also has a rotor core pre-laminated in a metal pipe in the same manner as that described in the above publication,
After arranging the magnetic material, these rotor cores were integrally formed by the clamp pins. At this time, an air gap portion is provided between adjacent magnetic materials by an air gap to ensure pole separation of the magnetic materials to improve efficiency.

As another conventional technique, Japanese Patent Publication No. 60-
There was a thing as described in 23584 gazette. What is described in this publication is one in which a magnetic material serving as a magnetic pole is inserted (embedded) in an iron core of a rotor. The one described in this publication relates to a self-startable synchronous motor.

Still another conventional technique is Japanese Patent Laid-Open No.
There was a thing as described in 185247 gazette.
What is described in this publication is a rotor configured by embedding a magnetic material in the salient pole portion of a rotor core having a salient pole structure.

[0006] In this publication, the rotor core in which a magnetic material is embedded, and the end face members covering both end faces of the rotor core are integrally formed by press-fitting the rotary shaft.

[0007]

In the conventional technique thus constructed, the eddy current loss due to the cage portion of the die casting material (zinc, aluminum, etc.) is large. Large eddy current loss in metal pipes. Since there is a protrusion provided on the rotor core as a detent for the magnetic material, there is a problem that it is difficult to maintain high dimensional accuracy during manufacturing.

Further, in the case where a gap for pole separation is provided,
When magnetic material (especially ferrite) cracks such as cracks due to thermal shock or mechanical shock applied to the rotor, when fragments of this magnetic material wrap around in the void and progress to further cracks or chips was there.

In another conventional technique, an eddy current is generated in the secondary conductor provided in the rotor core, and a part of the magnetic flux from the magnetic material is short-circuited in the rotor core (conductor). There was a problem that the operation efficiency was lowered.

Further, in other conventional techniques, there is a problem in that the core is dislocated in the state of the rotor core and the assembly accuracy in the press-fitting process of the rotary shaft is poor, and it is difficult to maintain high dimensional accuracy.

With respect to such problems, the present invention generates an eddy current by a protective metal pipe, an eddy current in a secondary conductor by die casting, a crack of a magnetic material due to a gap, and a rotor rotor. (EN) Provided is a rotor which prevents deterioration of dimensional accuracy.

[0012]

A rotor of a compressor electric motor according to the present invention is a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single hermetic container.
The rotor of the electric motor is composed of a rotor core formed by laminating a plurality of rotor iron plates, and a non-magnetic material having a balancer disposed at one end of the rotor and at least a caulking boss for caulking an oil separating disk. And a second end surface member made of a non-magnetic material and arranged at the other end of the rotor. The stator core, the first end surface member, and the second end surface member are provided. It is provided with a plurality of caulking members that penetrate and integrally crimp the stator core, the first end surface member, and the second end surface member.

Further, the rotor core is integrally laminated by welding or caulking an electromagnetic steel sheet of 0.5 mm or less, and the first end face member and / or the second end face member is made of a non-magnetic material such as aluminum. It is formed by die casting of a metal material, drawn by forming a non-magnetic metal, or formed of a resin material.

Further, the rotor of the electric motor for a compressor according to the present invention is a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container. A rotor core is formed by laminating rotor iron plates and accommodating magnetic bodies forming a plurality of magnetic poles along the outer peripheral side, and at least a balancer arranged at one end of the rotor and a disc for oil separation. A first end surface member made of a non-magnetic material having a caulking boss for caulking and a second end surface member made of a non-magnetic material arranged at the other end of the rotor are provided, and the stator core, It is provided with a plurality of caulking members which are inserted into through holes penetrating the first end face member and the second end face member to integrally crimp the stator iron core, the first end face member and the second end face member. .

Further, the rotor core is provided with a gap between adjacent magnetic poles of the plurality of magnetic poles for preventing a short circuit of the magnetic flux, the gap being connected to a through hole penetrating the caulking member, and the magnetic body is For example, ferrite, rare earth-based sintered or alloy, or rare earth-based plastic magnet.

Further, the rotor of the electric motor for a compressor according to the present invention is a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, and the rotor of the electric motor has a plurality of rotations. A rotor core formed by laminating iron plates for a child and accommodating magnetic bodies forming a plurality of magnetic poles along the outer peripheral side, and at least a balancer arranged at one end of the rotor and a disk for separating oil are disposed. A first end surface member made of a non-magnetic material having a caulking boss for tightening and a second end surface member made of a non-magnetic material arranged at the other end of the rotor are provided. The end face member and the outer peripheral side face of the second end face member are welded together to integrally form the stator core, the first end face member, and the second end face member.

The rotor of the compressor electric motor according to the present invention is a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single hermetic container, and the rotor of the electric motor is composed of a plurality of rotors. A rotor core that is formed by stacking iron sheets for use in a magnetic material that forms a plurality of magnetic poles along the outer peripheral side, and a non-magnetic material disposed at one end of the rotor.
And an outer peripheral side surface of the stator core, the first end surface member, and the second end surface member. It is provided with a welded portion which is welded to integrally form the stator core, the first end face member and the second end face member.

[0018]

Since the rotor of the compressor electric motor constructed as described above is integrally formed before the rotor is press-fitted into the rotary shaft, the dimensional accuracy of the rotor can be maintained high.

Further, since the protective metal pipe and the secondary conductor by die casting are eliminated, the generation of eddy current due to these structures can be prevented.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a compressor. In this figure, reference numeral 1 is a closed container, in which an electric 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 comprises a stator 4 fixed to the inner wall of the hermetically sealed container 1, and a rotor 5 supported inside the stator 4 so as to be rotatable around a rotation shaft 6.
The stator 4 has a stator winding 7 for applying a rotating magnetic field to the rotor 5.
Is equipped with.

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 decentered from each other by 180 degrees in phase.

Reference numerals 13 and 14 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.

Reference numerals 15 and 16 denote a first frame body and a second frame body, respectively. The first frame body 15 and the partition plate 8 have a cylinder 9 between them.
The closed compression space of the cylinder 10 is formed, and the second frame 16 also forms the closed compression space of the cylinder 10 between itself and the partition plate 8. The first frame body 15 and the second frame body 16 are provided with bearing portions 17 and 18 of the rotary shaft 6, respectively.

Numerals 19 and 20 are discharge mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively.

Reference numeral 21 is a discharge hole, which is provided in the first frame 15 and connects the cylinder 9 and the muffler 19 to each other.
A discharge hole provided in the second frame 16 for communicating the inside of the muffler 20 with the cylinder 10 is not shown.

Reference numeral 21 is a bypass pipe provided outside the closed container 1 and communicates with the inside of the 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. Reference numeral 25 denotes a closed terminal, which supplies electric power from the outside of the closed container 1 to the stator winding 7 of the stator 4. (Lead wire connecting the closed terminal 25 and the stator winding 7 is not shown.) 26 is a disk for oil separation, and is fixed to the rotary shaft 6 by a bolt 27. The disk 26 may be fixed by a boss described later.

FIG. 2 is a partial sectional view of the rotor shown in FIG. 1 (state before being press-fitted into the rotary shaft 6). In this figure, 28 is a rotor core, which is formed by laminating a plurality of 0.5 mm thick electromagnetic steel plates (iron plates for rotors) punched into a predetermined shape. The electromagnetic steel sheets are crimped to each other and integrally formed (or integrally formed by welding).

Reference numeral 29 is a magnetic material (ferrite, a rare earth-based sintered body, an alloy, or a rare earth-based plastic magnet), which is press-fitted into a slot formed in the rotor core 28 along the axial direction. . A plurality of the magnetic materials are arranged in the rotor core 28 along the outer peripheral side of the rotor core.

Reference numeral 30 denotes a first end surface member attached to one end of the rotor core 28, and the balance weights 33, 34, 35, 36 for the compression element 3 and the boss 31 located on the balance weights 36, 35. , 32. These end face members 30, balance weights 33 to
The 36 and the bosses 31 and 32 are integrally formed of die-cast non-magnetic metal (aluminum or the like), drawn, or made of a resin material.

The positions and shapes of the bosses 31 and 32 are configured so that the oil separating disk 26 can be fitted therein.

Reference numeral 38 denotes a second end face member (disk shape) attached to the other end of the rotor core 28, which is made of a non-magnetic metal (aluminum or the like) by die casting or drawn like the end face member 30 described above. Further, it is integrally formed of a resin material.

Reference numeral 37 is a welded portion, which is provided on the outer periphery of the plurality of rotors 3 along the axial direction. In these welded parts, the magnetic material 29 is press-fitted into the rotor core 28, the first end face member 30 and the second end face member 38 are set, and then these members are welded at the same time to form the rotor 5. Is.

FIG. 3 is a top view of the first end surface member 30 shown in FIG. This end face member 30 is a concentric circle (donut)
The hole 39 has a hole-like shape, and the rotary shaft 6 of the rotor 5
Is something that looks into.

FIG. 4 is a top view of the second end surface member 38 shown in FIG. The end face member 38 is a concentric circle (donut).
The hole 40 penetrates the rotary shaft 6.

FIG. 5 is a top view of an electromagnetic steel plate used for the rotor core 28 shown in FIG. 2 (or a top view of a rotor core after laminating a plurality of electromagnetic steel plates). In this figure, 4
1 to 44 are slots into which a fan-shaped magnetic material 29 and the like are press-fitted and are arranged along the outer circumference of the rotor core 28.
Reference numerals 45 to 48 are slits located between the slots 41 to 44 (transitions of the poles), and are gaps (air gaps) for promoting pole separation of the magnetic poles after the magnetic material is press-fitted into the slots 41 to 44. Acts as a gap). Reference numeral 49 is a hole into which the rotary shaft 6 is press fitted.

FIG. 6 is a top view showing another embodiment of the rotor core. A plurality of rotor iron plates 50 punched out from electromagnetic steel plates so as to form salient pole portions 51 to 54 are laminated. 55 to 58 are notches provided so that salient pole portions are formed between the salient pole portions 51 to 54.

Reference numerals 59 to 62 are slots into which the magnetic material is press-fitted. 63 is a hole into which the rotary shaft is press-fitted.

After the magnetic material is press-fitted into the rotor core, the end face members are set in the same manner as in the above embodiment and the outer periphery of the rotor is welded to form the rotor integrally. At this time, the shape of the end surface member may be the same as the shape of the end surface of the rotor core.

FIG. 7 is a partial sectional view of a rotor showing another embodiment of the present invention. In this figure, 101 is a rotor core, which is formed by laminating a plurality of 0.5 mm thick electromagnetic steel plates (iron plates for rotors) punched into a predetermined shape. The electromagnetic steel sheets are crimped to each other and integrally formed (or integrally formed by welding).

Reference numeral 102 denotes a magnetic material (same as the magnetic material shown in FIG. 2), which is press-fitted into a slot formed in the rotor core 101 along the axial direction. Further, a plurality of magnetic materials are provided along the outer peripheral side of the rotor core 101
It is located inside.

Reference numeral 103 denotes a first end surface member attached to one end of the rotor core 101, and the balance weights 104, 105, 106 and 107 for the compression element 3 and the boss 108 located on the balance weights 104 and 107. , 109. These end face members 103,
Balance weights 104-107, bosses 108, 109
Is made of die-cast non-magnetic metal (aluminum, zinc, etc.), is formed by drawing, or is integrally formed of resin material.

The positions and shapes of the bosses 108 and 109 are configured so that the oil separating disk 26 can be fitted therein.

Reference numeral 110 denotes a second end face member (disk shape) attached to the other end of the rotor iron core 101, which is made of die-cast non-magnetic metal (aluminum or the like) or drawn like the end face member 103 described above. Further, it is integrally formed of a resin material.

Reference numerals 111 to 114 denote caulking members (caulking pins, caulking bolts, etc.), and the first end surface member 10
3, the rotor core 101, and the first end member 103, the rotor core 101, and the second end member 110 are caulked into a body by using through holes penetrating the rotor core 101 and the second end member 110. .

FIG. 8 shows the first end surface member 103 shown in FIG.
FIG. The end surface member 103 has a concentric circle (donut) shape, and the rotation shaft 6 of the rotor 5 is seen through the hole 119.

Denoted at 115 to 118 are holes having sizes and shapes through which the caulking members 111 to 114 are passed.

FIG. 9 shows the second end surface member 110 shown in FIG.
FIG. The end surface member 110 has a concentric circle (donut) shape, and the hole 124 penetrates the rotary shaft 6.

Numerals 120 to 123 are holes, respectively, of the size and shape through which the caulking members 111 to 114 are passed.

FIG. 10 is a top view of an electromagnetic steel plate used for the rotor core 101 shown in FIG. 7 (or a top view of a rotor core after laminating a plurality of electromagnetic steel plates). In this figure, reference numerals 125 to 128 are slots into which a fan-shaped magnetic material (magnetic material 102) and the like are press-fitted and are arranged along the outer circumference of the rotor core 101. 129 to 132 are slits located between the slots 125 to 128 (transitions of the poles), and are gaps (air gaps) for promoting pole separation of the magnetic poles after the magnetic material is press-fitted into the slots 125 to 128. Acts as a gap).

Reference numerals 131 to 134 denote caulking members 111 to 111, respectively.
114 is a hole sized and shaped to be threaded through slot 1
The holes 131-134 are connected to the slits 129-132 while being arranged at a position between 25-128. By connecting these slits to the holes, the air gap between adjacent magnetic poles becomes large and the leakage magnetic flux is reduced, so that the operating efficiency of the electric motor can be increased. Reference numeral 135 is a hole into which the rotary shaft 6 is press fitted.

The rotor includes the first end surface member 103,
The holes 1 of the rotor core 101 and the second end surface member 110, respectively.
After 15-118, 131-134, and 120-123 are stacked so as to be connected, they are caulked with caulking members 111-114 to be integrated.

FIG. 11 is a top view showing another embodiment of the rotor core. A plurality of rotor iron plates 140 punched out from electromagnetic steel plates so that salient pole portions 136 to 138 are formed are laminated. 141 to 144 are salient pole portions 1 respectively
36 to 139 is a notch provided so as to form a salient pole portion.

145 to 148 are slots for press-fitting the magnetic material. Reference numeral 149 is a hole into which the rotary shaft is press fitted.

151 to 153 are caulking members 111 to 1
14 is a hole having a size and shape through which 14 is passed. After the magnetic material is press-fitted into the rotor core, the end face member is set in the same manner as in the above embodiment, and the caulking member is used to integrally configure the rotor. At this time, the shape of the end surface member may be the same as the shape of the end surface of the rotor core.

FIG. 12 is a top view showing still another embodiment of the rotor core. In this figure, 154 to 157 are slots into which a fan-shaped magnetic material (magnetic material 102) or the like is press-fitted. 158-161 are the respective slots 154-1
It is a slit located between 57 (the transition of the pole), and acts as a gap (air gap) for promoting the pole separation of the magnetic poles after the magnetic material is press-fitted into the slots 154-157.

162 to 165 are caulking members 111 to 111, respectively.
114 is a hole sized and shaped to be threaded through slot 1
The holes 162 to 165 are connected to the slits 158 to 161 while being arranged at a position between 54 to 157. At the same time, these holes are opened towards the outer circumference of the rotor core.

By connecting these slits to the holes and releasing them toward the outer circumference of the rotor core, the air gap between adjacent magnetic poles becomes large, and the leakage flux is reduced, so that the operating efficiency of the electric motor can be increased. . Reference numeral 166 is a hole into which the rotary shaft 6 is press fitted.

[0060]

As described above, the rotor of the present invention does not have a metal pipe or a secondary conductor of a die casting, which is a source of eddy current generation, so that the operation efficiency of the electric motor can be increased accordingly. That is, the electric motor having the same output can be made smaller than the conventional one, and the entire size of the compressor can be reduced.

Further, by providing an air gap between the adjacent poles of the rotor, it is possible to reduce the leakage of magnetic flux and improve the operation efficiency of the electric motor, and it is possible to obtain a smaller compressor.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts of a compressor showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the rotor shown in FIG.

3 is a top view of the first end surface member shown in FIG. 2. FIG.

4 is a top view of the second end surface member shown in FIG. 2. FIG.

5 is a top view of an electromagnetic steel plate used for the rotor core shown in FIG.

FIG. 6 is a top view showing another embodiment of the rotor core.

FIG. 7 is a partial cross-sectional view of a rotor showing another embodiment of the present invention.

8 is a top view of the first end surface member shown in FIG. 7. FIG.

9 is a top view of the second end surface member shown in FIG. 7. FIG.

10 is a top view of an electromagnetic steel plate used for the rotor core shown in FIG.

FIG. 11 is a top view showing another embodiment of the rotor core.

FIG. 12 is a top view showing still another embodiment of the rotor core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 3 Compression element 4 Stator iron core 5 Rotor 6 Rotating shaft 7 Stator winding 28 Rotor iron core 29 Magnetic material 30 First end face member 38 Second end face member 31, 32 Boss 33 to 36 Balance weight

Claims (8)

[Claims] 1. In a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, a rotor of the electric motor includes a rotor core in which a plurality of rotor iron plates are laminated, A first end member made of a non-magnetic material having at least one balancer and a caulking boss for caulking an oil separating disk, and a non-magnetic member provided at the other end of the rotor. A second end surface member made of a material, and passing through the stator core, the first end surface member, and the second end surface member.
2. A rotor for a compressor electric motor, comprising: a plurality of caulking members for integrally caulking the end face member and the second end face member. 2. The rotor for a compressor electric motor according to claim 1, wherein the rotor core is integrally laminated by welding or caulking an electromagnetic steel sheet having a thickness of 0.5 mm or less. 3. The first end face member and / or the second end face member.
2. The compressor electric motor according to claim 1, wherein the end face member is formed by die casting of a non-magnetic metal material such as aluminum, drawn by molding a non-magnetic metal, or formed of a resin material. Rotor. 4. A compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single hermetic container, and the rotor of the electric motor has a plurality of iron plates for rotors laminated and is arranged along the outer peripheral side. A rotor iron core containing a magnetic material forming a plurality of magnetic poles, and a non-magnetic material having a balancer disposed at one end of the rotor and at least a caulking boss for caulking an oil separating disk. A first end surface member,
A second end face member made of a non-magnetic material disposed at the other end of the rotor, and inserted into a through hole penetrating the stator core, the first end face member, and the second end face member. A rotor for a compressor electric motor comprising a plurality of caulking members for integrally caulking the stator core, the first end surface member, and the second end surface member. 5. The rotor core is provided with a gap for preventing a magnetic flux from being short-circuited between adjacent magnetic poles of the plurality of magnetic poles, and the gap is connected to a through hole penetrating the caulking member. The rotor of the compressor electric motor according to claim 4. 6. The rotor of a compressor electric motor according to claim 5, wherein the magnetic material is ferrite, rare earth-based sintered or alloy, or rare earth-based plastic magnet. 7. A compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, wherein the rotor of the electric motor has a plurality of iron plates for rotors laminated and is arranged along the outer peripheral side. A rotor iron core containing a magnetic material forming a plurality of magnetic poles, and a non-magnetic material having a balancer disposed at one end of the rotor and at least a caulking boss for caulking an oil separating disk. A first end surface member,
A second end face member made of a non-magnetic material is provided at the other end of the rotor, and the stator core, the first end face member, and the outer peripheral side faces of the second end face member are welded and fixed to each other. A rotor for an electric motor for a compressor, comprising a welded portion integrally forming a child core, a first end surface member, and a second end surface member. 8. A compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, wherein the rotor of the electric motor has a plurality of iron plates for rotors laminated and is arranged along the outer peripheral side. A rotor core that houses a magnetic material that forms a plurality of magnetic poles, a first end surface member that is disposed at one end of the rotor and that is made of a non-magnetic material, and is disposed at the other end of the rotor. A second end surface member made of a non-magnetic material, and welding the stator core, the first end surface member, and the outer peripheral side surfaces of the second end surface member by welding these stator core, first end surface member, and A rotor for an electric motor for a compressor, comprising a welded portion integrally forming two end face members.