JPH1127883A - Rotor of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor of a motor which can not only reduce the adverse effects caused by a through-hole for fixing by calking but also obtain high performance, with a few number of parts and simple assembly work. SOLUTION: This rotor comprises a rotor iron core 26, where plural sheets of iron plates 27 for a rotor are stacked, at least two places of insertion holes 36-47 which are provided in axial direction of the rotary shaft 6 at this rotor iron core 26, and at least two sheets of plate-shaped permanent magnets 60-71 which are inserted into these insertion holes. Here, the insertion holes 36-47 are arranged in two rows in a coaxial form, with their diameters different in the circumferential direction of the rotor.

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 an electric motor used for a compressor or the like.

[0002]

2. Description of the Related Art Conventionally, a rotor of a compressor motor of this kind, particularly a rotor of a motor called a brushless DC motor,
For example, it is configured as shown in FIG. 4 (C) of Japanese Patent Application No. 5-138893 filed earlier by the applicant. That is,
In the conventional rotor, a plurality of iron plates for a rotor are laminated and fixed by caulking to form a rotor core, and four (in the case of four poles) magnetic poles are formed along the outer peripheral side of the rotor core. A magnetic material (permanent magnet) is inserted, and the outer peripheral surface of the rotor core is formed with a notch between the magnetic materials to form a salient pole portion, thereby preventing a short circuit of magnetic flux.

Further, a through-hole for caulking and fixing the upper and lower non-magnetic end face members and the like is formed in a rotor iron plate of the rotor core, and the end face member and the oil separating member are separated from each other by using rivets in the through holes. Was fixed to the rotor core by caulking.

On the other hand, as shown in FIG. 4 and disclosed in JP-A-47-27302, a plurality of flat permanent magnets 100 are provided.
With the rotor 101 such that their magnetic paths are tangential.
Are radially inserted and arranged from the center.

[0005]

However, in the former rotor, since the through hole is formed inside the notch, that is, between the magnetic bodies, when the number of magnetic poles is four or more,
A through hole exists in a magnetic path formed between adjacent magnetic bodies (magnetic poles). For this reason, there has been a problem that the magnetic resistance increases in the through hole and the output of the motor decreases.

In the latter configuration, four insertion holes 1 are provided.
02, four magnets 100 are inserted into the outer periphery of the magnet 100.
It is necessary to provide a protrusion preventing member 103 for preventing 00 from popping out due to centrifugal force, which increases the number of parts and complicates the operation. In addition, since there are four magnets, there is a problem that the magnetic force is limited and desired characteristics cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and not only reduces the adverse effect due to the through-hole for caulking but also reduces the number of parts and facilitates the assembly work. It is an object of the present invention to provide a rotor of an electric motor having characteristics.

[0008]

According to the present invention, there is provided a rotor core in which a plurality of rotor iron plates are laminated, and the rotor core is provided along the axial direction of the rotating shaft. In a motor rotor comprising at least two insertion holes and at least two plate-shaped permanent magnets inserted into these insertion holes, the insertion holes are concentric with the rotor having different diameters in the circumferential direction. Are arranged in two rows.

According to a second aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are stacked, and at least two insertion holes provided in the rotor core along the axial direction of the rotation shaft. A motor rotor comprising at least two plate-shaped permanent magnets inserted into these insertion holes,
The insertion holes are concentrically arranged in two rows with different diameters in the circumferential direction of the rotor, and the inner insertion hole is divided into two parts with a through hole for rivet insertion.

According to a third aspect of the present invention, there is provided an end face member for closing insertion holes provided on both end faces of the rotor core, and a plurality of penetration members penetrating the end face members and the rotor core along the rotation axis direction. A hole and a rivet that integrally forms the end face member and the rotor core using the through hole are provided, and the through hole is provided between magnets facing between adjacent magnetic poles.

According to a fourth aspect of the present invention, there is provided an end face member for closing insertion holes provided at both end faces of the rotor core, and a plurality of through-holes penetrating the end face members and the rotor core along the rotation axis direction. A hole, and a rivet that integrally forms the end face member and the rotor core using the through hole. The through hole is provided between magnets facing between adjacent magnetic poles, and constitutes each magnetic pole. An open or closed air hole is provided on the outer peripheral surface of the rotor between the magnets.

[0012]

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 a rotor of an electric motor according to the present invention is applied. In this figure, reference numeral 1 denotes a closed container, and an electric motor (brushless DC)
A motor (2) and a compression element (3) rotatably driven by the electric motor (2) are housed below. The airtight container 1 contains the electric motor 2 and the compression element 3 in a preliminarily divided into two parts and is sealed 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 on the inside of 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 includes 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 plan view of the rotor 5 equipped with a permanent magnet. In the drawing, reference numeral 26 denotes a rotor core, which is formed by laminating a plurality of rotor iron plates 27 punched out of an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm into a shape as shown in FIG. Have been.

The iron plate 27 for the rotor is stamped out of an electromagnetic steel plate so as to form magnetic pole portions 28 to 31 constituting four magnetic poles as shown in FIG. At this time, the outer diameter D between the vertices of the magnetic pole portions 28 to 31 is in a range of 30 mm to 70 mm, and is, for example, 50 mm in the embodiment.

Reference numerals 36 to 39 and 40 to 47 denote twelve insertion holes provided in the rotor core 26 along the axial direction of the rotating shaft 6. The insertion holes 36 to 47 are arranged concentrically in two rows with different diameters in the circumferential direction of the rotor 5, and the inner insertion holes 40 to 47 are through holes 50 for inserting the rivets 51.
60 to 71, which are divided into two parts with the
Twelve flat permanent magnets inserted in 6 to 47.

The rotor 5 includes end members 48 and 49 for closing insertion holes at both end surfaces of the rotor core 5, and the end member 4.
A plurality of through-holes 50 penetrating the rotor cores 8 and 49 along the rotation axis direction, and rivets 51 integrally forming the end face members 48 and 49 and the rotor core 26 using the through-holes. And the through-hole 50 is provided in each of the magnetic poles 28 to 31.
Magnets 61, 6 corresponding to the insertion holes 40 to 47 on the inside of
2, 64, 65, 67, 68, 70, 71 are provided.

The bridge portion 56 formed at the distal end on the outer peripheral side of each of the insertion holes 36 to 47 is formed to have a width of 0.3 mm or more and 0.5 mm or less. The inner diameter of the rotor iron plates 27 at both ends constituting the rotor core 5 is formed to be slightly larger than the inner diameter of the rotor iron plate 27 at the center.

Further, when the outer diameter of the rotor core 26 is D, the lamination thickness is L, the thickness of the magnet is t, and the length of the magnet is 1, the rotor 5 has the following formulas (1) and (2). It is configured to satisfy the following. 0.30 <L / D <1.20 (1) 0.02 <t / l <0.20 (2)

Further, a balance weight 57 having an oil separating function is attached to the upper surface of the end face member 48.

In the rotor of the electric motor configured as described above, the permanent magnets 60 to 71 are concentrically arranged in two rows of the insertion holes 36 to 4 having different diameters in the circumferential direction of the rotor 5.
7, a total of 12 magnets are inserted, so that many magnets can be effectively arranged in a limited space and the characteristics can be improved.
The reluctance torque can be used effectively.

Further, since the inner insertion holes 40 to 47 are divided into two parts with the through hole 50 for inserting the rivet 51 therebetween, the rivet 51 can be arranged without obstructing the magnetic path. Further, since the magnets 60 to 71 are in the form of a flat plate, molding is easy, and the magnets 60, 63, 66, 69 and the magnet 6
1, 62, 64, 65, 67, 68, 70, 71 can be of the same shape, thereby improving productivity and promoting cost reduction.

Since the bridge portions 56 formed at both ends of the insertion holes 36 to 47 are formed to have a width of 0.3 mm or more and 0.5 mm or less, magnetic leakage at the bridge portions 56 can be suppressed. . The inner diameter of the rotor iron plates 27 at both ends constituting the rotor iron core 5 is the same as the rotor iron plate 2 at the center.
7, the inner diameter of the end of the rotor 5 can be prevented from being reduced due to the contact of the outer diameter of the rotor 5.

The rotor 5 has the following formulas (1) and (2) when the outer diameter of the rotor core 26 is D, the lamination thickness is L, the thickness of the magnet is t, and the length of the magnet is l. , The magnets 40 to 47 that are made into common parts are connected to the rotor 5.
Can be incorporated effectively. 0.30 <L / D <1.20 (1) 0.02 <t / l <0.20 (2)

Further, since a balance weight 57 having an oil separating function is attached to the upper surface of the end face member 48, an air gap between the rotor 5 and the stator 4 can be provided without providing a separate separating plate. Oil in the refrigerant that rises can be efficiently separated.

Each magnetic pole 2 on the outer peripheral surface of the rotor 5
8 to 31, an air hole 72 opened and cut out and an air hole 74 closed by a bridge 73 are formed.
A magnetic short circuit at the ends of 0 to 71 can be prevented.

The rotor 5 configured as described above has a configuration in which a hole 5a formed at the center of the iron plate 27 for the rotor is shrunk on the rotation shaft 6. The permanent magnet of the above embodiment is made of, for example, a rare earth magnet material such as a praseodymium magnet or a neodymium magnet whose surface is nickel-plated, and its outer shape is rectangular as described above. I have.

The flat end members 48 and 49 attached to the upper and lower ends of the rotor core 26 are formed of a non-magnetic material such as aluminum or resin material into substantially the same shape as the iron plate 27 for the rotor. I have.

When a direct current is applied to the stator winding 7 of the stator 2, the rotor 5 repels and attracts a magnetic field generated by the permanent magnets 60 to 71.
(E.g., 500 rpm to 1000 rpm by changing the applied voltage)
(Variable within a range of 0 rpm) in the direction of the arrow in FIG. The rotation of the rotor 5 causes the rotation shaft 6 to rotate, which causes the eccentric portions 11 and 12 to rotate.
And the second rollers 13 and 14 rotate, and the compressor exerts a compressing action.

FIG. 3 shows another embodiment, in which the rotor 5
Eight insertion holes 75 to 8 concentrically with different diameters in the circumferential direction
2, and eight magnets 83 to 90 are inserted into each of the insertion holes. The outer periphery of the rotor 5 forms four air holes 91 and bridges 92 between the magnetic poles. 9
3 is formed concentrically. In this case, the same operation and effect as those of the embodiment shown in FIG. 2 can be obtained.

In each of the embodiments, the present invention is applied to a rotor having four magnetic poles. However, the present invention is not limited to this, and the present invention is also effective to a rotor of a motor having four or more poles, for example, eight poles. The iron plate 27 for the rotor is laminated and fixed by caulking projections or welding to form the rotor core 26, and the upper and lower end members 48, 49 are connected to the rotor core 2 by the rivets 51.
The present invention is also effective for a device that is caulked to 6.

[0036]

As described above in detail, in the present invention, the permanent magnets 60 to 71 are provided in the insertion holes 36 to 47 arranged concentrically in two rows with different diameters in the circumferential direction of the rotor 5. Since twelve are inserted, many magnets can be effectively arranged in a limited space, the characteristics can be improved, and the reluctance torque can be effectively used.

Further, since the inner insertion holes 40 to 47 are divided into two parts with the through hole 50 for inserting the rivet 51 therebetween, the rivet 51 can be arranged without obstructing the magnetic path.

Further, since the magnets 60 to 71 are in the form of a flat plate, molding is easy, and the magnets 60, 63, 66, 69 and the magnets 61, 62, 64, 65, 67, 68, 70, 7 are formed.
1 can use the same shape each, improve productivity,
Cost reduction can be promoted.

Further, each magnetic pole 2 on the outer peripheral surface of the rotor 5
8 to 31, an air hole 72 opened and cut out and an air hole 74 closed by a bridge 73 are formed.
A magnetic short circuit at the ends of 0 to 71 can be prevented.

[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 plan view showing a rotor of the present invention.

FIG. 3 is a plan view of a rotor according to another embodiment of the present invention.

FIG. 4 is a plan view of a rotor showing a conventional example.

[Explanation of symbols]

 2 Motor 4 Stator 5 Rotor 6 Rotating shaft 26 Rotor core 27 Iron plate for rotor 28-31 Magnetic pole 72-74 Wind hole 36-47 Insertion hole 60-71 Permanent magnet 50 Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiko Arai 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotating shaft, and inserted into these insertion holes. In a motor rotor comprising at least two plate-shaped permanent magnets, the insertion holes are concentrically arranged in two rows with different diameters in the circumferential direction of the rotor. Rotor. 2. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft, and inserted into these insertion holes. In a rotor of an electric motor comprising at least two plate-shaped permanent magnets, the insertion holes are arranged concentrically in two rows with different diameters in the circumferential direction of the rotor, and the inner insertion holes are used for rivet insertion. A rotor for an electric motor, wherein the rotor is divided into two parts with the through hole interposed therebetween. 3. An end face member for closing insertion holes provided on both end faces of a rotor core, a plurality of through holes penetrating the end face members and the rotor core along a rotation axis direction, and using the through holes. 2. The electric motor according to claim 1, further comprising a rivet integrally forming the both end face members and the rotor core, wherein the through hole is provided between magnets facing between adjacent magnetic poles. Rotor. 4. An end face member for closing insertion holes provided on both end faces of a rotor core, a plurality of through holes penetrating the end face members and the rotor core along a rotation axis direction, and using the through holes. A rivet integrally forming the both end face members and the rotor core. The through hole is provided between magnets facing between adjacent magnetic poles, and an outer periphery of the rotor is provided between magnets constituting each magnetic pole. 2. The rotor for an electric motor according to claim 1, wherein an open or closed air hole is provided on the surface.