JP2012139045A - Rotor, motor, and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of magnetic flux even with a balance weight made of a magnetic material, eliminates the need for an adaptor for forming a gap between the balance weight and a rotor core, and reduces man hours for attaching an entire body of the balance weight so as to form the gap with the rotor core.SOLUTION: A balance weight 51 is fixed to a rotor core 31 at a first fixing position S1 and a second fixing position S2. The first fixing position S1 and the second fixing position S2 are located at the same polarity side of first and second magnets 61, 62 which are adjacently located. Since short-cuts of magnetic flux do not occur between the same polarities of the magnets 61, 62, and thus the leakage of the magnetic flux is prevented even with the balance weight 51 made of a magnetic material.

Description

  The present invention relates to a rotor, a motor, and a compressor.

  Conventionally, a rotor includes a rotor core, a plurality of magnets arranged and fixed in the circumferential direction inside the rotor core, and a balance weight attached to an end face in the axial direction of the rotor core and made of a magnetic material. (See JP 2009-225639 A: Patent Document 1).

  The balance weight is fixed to the rotor core at the radially outer side of the first magnet and the radially outer side of the second magnet adjacent to the first magnet. Here, since the magnetic pole on the outer side in the radial direction of the first magnet and the magnetic pole on the outer side in the radial direction of the second magnet are different from each other, there is a problem that the magnetic flux leaks through the balance weight of the magnetic material. In order to solve this problem, in the conventional rotor, the balance weight is separated from the end face of the rotor core using an adapter to prevent magnetic flux leakage.

  However, the conventional rotor requires an adapter for making a gap between the balance weight and the rotor core, resulting in a problem that the number of parts increases. In addition, there is a problem that workability is inferior due to the trouble of attaching the entire balance weight so as to have a gap between the rotor core. In addition, even if there is a gap between the balance weight and the rotor core, the balance weight of the magnetic material is provided across the different poles of different magnets, so the magnetic flux is short-circuited between the different poles, Magnetic flux leakage could not be prevented reliably.

JP 2009-225639 A

  Therefore, an object of the present invention is to prevent magnetic flux leakage even when a balance weight made of a magnetic material is used, and an adapter for making a gap between the balance weight and the rotor core becomes unnecessary, and the entire balance weight is connected to the rotor core. It is an object of the present invention to provide a rotor that can save the trouble of mounting so as to have a gap therebetween, a motor having the rotor, and a compressor having the motor.

In order to solve the above problems, the rotor of the present invention is:
Rotor core,
A first magnet and a second magnet fixed in the rotor core and adjacent in the circumferential direction;
A balance weight which is attached to at least one end surface side in the axial direction of the rotor core and is made of a magnetic material;
The balance weight is fixed to the rotor core at the first fixed position and the second fixed position,
The first fixed position is located on the radially outer side of the rotor core than the first magnet, the second fixed position is located on the radially inner side of the rotor core than the second magnet,
The radially outer magnetic pole of the first magnet and the radially inner magnetic pole of the second magnet have the same polarity.

  According to the rotor of the present invention, since the first fixed position and the second fixed position are located on the same pole side of the adjacent first and second magnets, the magnetic flux is short-circuited between the same poles in the first place. There is no. For this reason, even if the balance weight of a magnetic material is used, leakage of magnetic flux can be prevented. Further, an adapter for making a gap between the balance weight and the rotor core is unnecessary, and the number of parts can be reduced. Further, it is possible to save the trouble of attaching the entire balance weight so as to have a gap between the rotor core and workability is improved.

  In the rotor according to an embodiment, a portion of the balance weight that overlaps the magnet has a gap with the rotor core as viewed from the axial direction of the rotor core.

  According to the rotor of this embodiment, since the portion of the balance weight that overlaps the magnet has a gap with the rotor core, magnetic flux leakage can be reliably prevented at the portion of the balance weight that overlaps the magnet.

The motor of the present invention
The rotor,
And a stator arranged so as to surround the outer peripheral side of the rotor.

  According to the motor of the present invention, since the rotor is provided, it is possible to realize a motor with high operation efficiency free from magnetic flux leakage.

The compressor of the present invention is
A sealed container;
A compression mechanism disposed in the sealed container;
It is provided with the said motor which drives the said compression mechanism part via a rotating shaft while arrange | positioning in the said airtight container.

  According to the compressor of the present invention, since the motor is provided, it is possible to realize a compressor with good operation efficiency without leakage of magnetic flux.

  According to the rotor of the present invention, since the first fixed position and the second fixed position are located on the same pole side of the adjacent first and second magnets, the magnetic flux is short-circuited between the same poles in the first place. Therefore, even if a balance weight made of magnetic material is used, leakage of magnetic flux is prevented, and an adapter for making a gap between the balance weight and the rotor core becomes unnecessary, and a gap is formed between the balance weight and the rotor core. It is possible to save the trouble of mounting to have.

  According to the motor of the present invention, since the rotor is provided, it is possible to realize a motor with high operation efficiency free from magnetic flux leakage.

  According to the compressor of the present invention, since the motor is provided, it is possible to realize a compressor with good operation efficiency without leakage of magnetic flux.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of the rotor of the present invention. It is a side view of FIG. 2A.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes a sealed container 1, a compression mechanism unit 2 and a motor 3 disposed in the sealed container 1. This compressor is a rotary compressor.

  A suction pipe 11 is connected to the lower side of the sealed container 1, while a discharge pipe 12 is connected to the upper side of the sealed container 1. The refrigerant gas supplied from the suction pipe 11 is guided to the suction side of the compression mechanism unit 2. This refrigerant is, for example, carbon dioxide, R410A, or R22.

  The motor 3 is disposed on the upper side of the compression mechanism unit 2 and drives the compression mechanism unit 2 via a rotating shaft 4. The motor 3 is disposed in a high-pressure region in the sealed container 1 where the high-pressure refrigerant gas discharged from the compression mechanism unit 2 is filled.

  The compression mechanism 2 includes a cylindrical main body 20 and an upper end 8 and a lower end 9 attached to upper and lower open ends of the main body 20.

  The rotating shaft 4 passes through the upper end 8 and the lower end 9 and is inserted into the main body 20. The rotary shaft 4 is rotatably supported by a bearing 21 provided at the upper end 8 of the compression mechanism 2 and a bearing 22 provided at the lower end 9 of the compression mechanism 2.

  A crankpin 5 is provided on the rotary shaft 4 in the main body 20 and compression is performed by a compression chamber 7 formed between a piston 6 fitted and driven by the crankpin 5 and a corresponding cylinder. . The piston 6 rotates in an eccentric state or revolves to change the volume of the compression chamber 7.

  The motor 3 includes a cylindrical rotor 30 fixed to the rotating shaft 4 and a stator 40 disposed so as to surround the outer peripheral side of the rotor 30. The stator 40 is disposed on the radially outer side of the rotor 30 via an air gap. That is, the motor 3 is an inner rotor type motor.

  The stator 40 includes a stator core 41 and a coil 42 wound around the stator core 41.

  As shown in FIG. 1, FIG. 2A and FIG. 2B, the rotor 30 includes a rotor core 31, a plurality of magnets 61 and 62 fixed in the rotor core 31 side by side in the circumferential direction, and both axial ends of the rotor core 31. And a balance weight 51 attached to each of the surface sides.

  An end plate 36 and a balance weight 51 are attached to each of both end faces of the rotor core 31 in order. The rotor core 31, the end plate 36 and the balance weight 51 are integrally fixed by a rivet 33.

  The rotor core 31 is composed of a plurality of laminated electromagnetic steel plates and is formed in a cylindrical shape. The rotor core 31 has a shaft insertion hole 31a, a magnet insertion hole 31b, and a gap 31c. The shaft insertion hole 31a is formed in a circular cross section, and the rotating shaft 4 is fitted therein. The magnet insertion hole 31b is formed in a rectangular cross section, and the four magnet insertion holes 31b are arranged so as to form square sides around the shaft insertion hole 31a. The gap portion 31c is provided so as to extend from both ends in the circumferential direction of each magnet insertion hole portion 31b to the outer side in the radial direction and close to the outer peripheral edge.

  The magnets 61 and 62 are made of rare earth magnets and are formed in a rectangular plate shape. One magnet 61, 62 is fitted in each magnet insertion hole 31b, and four magnets 61, 62 are fixed to the rotor core 31. In a pair of magnets 61 and 62 adjacent in the circumferential direction, the magnetic pole on the radially outer side (inside) of the first magnet 61 and the magnetic pole on the radially outer side (inner side) of the second magnet 62 are different from each other. The magnetic pole on the radially outer side (inside) of the first magnet 61 and the magnetic pole on the radially inner side (outer side) of the second magnet 62 have the same polarity.

  The balance weight 51 is made of a magnetic material such as iron. For this reason, it can be made cheaper than nonmagnetic materials such as stainless steel and brass.

  One balance weight 51 is attached to the upper end surface (one end surface) side of the rotor core 31. The balance weight 51 has an arc shape in plan view. The balance weight 51 is fixed to the rotor core 31 at the first fixed position S1 and the second fixed position S2. That is, the first fixed position S1 is configured by a rivet 33 that fixes one end of the balance weight 51 to the rotor core 31, and the second fixed position S2 is formed by a rivet 33 that fixes the other end of the balance weight 51 to the rotor core 31. It is configured.

  The first fixed position S <b> 1 is located on the radially outer side of the first magnet 61, and the second fixed position S <b> 2 is located on the radially inner side of the second magnet 62. The magnetic pole on the radially outer side of the first magnet 61 and the magnetic pole on the radially inner side of the second magnet 62 have the same polarity. The first magnet 61 and the second magnet 62 are adjacent to each other in the circumferential direction of the rotor core 31.

  The balance weight 51 intersects the first magnet 61 when viewed from the axial direction of the rotor core 31. A portion 51 a of the balance weight 51 that overlaps the first magnet 61 as viewed from the axial direction of the rotor core 31 has a gap G between the rotor core 31 (end plate 36). This portion 51a is formed in a protruding shape upward.

  In addition, since it is the same structure also in the lower end surface (other end surface) side of the said rotor core 31, description is abbreviate | omitted.

  According to the rotor 30 having the above-described configuration, the first fixed position S1 and the second fixed position S2 are located on the same pole side of the adjacent first and second magnets 61 and 62. There is no short circuit of magnetic flux between the poles. For this reason, even if the balance weight 51 of a magnetic material is used, leakage of magnetic flux can be prevented. Further, an adapter for making a gap between the balance weight 51 and the rotor core 31 (end plate 36) is not necessary, and the number of parts can be reduced. Further, it is possible to save the trouble of attaching the entire balance weight 51 so as to have a gap with the rotor core 31 (end plate 36), thereby improving workability.

  Further, since the first magnet 61 and the second magnet 62 are adjacent to each other, the balance weight 51 can be fixed in the vicinity of the adjacent magnets 61 and 62, and the moment of the balance weight 51 can be effectively increased. Can act.

  Further, since the portion 51a of the balance weight 51 that overlaps the magnet 61 has a gap G between the rotor core 31, leakage of magnetic flux can be reliably prevented in this portion 51a.

  According to the motor having the above configuration, since the rotor 30 is provided, a motor with good operation efficiency without magnetic flux leakage can be realized.

  According to the compressor having the above configuration, since the motor 3 is provided, it is possible to realize a compressor having good operation efficiency without leakage of magnetic flux.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, a balance weight may be provided on at least one end face side of the rotor core. The number of magnets and the balance weight can be increased or decreased. In addition to the rotary type, a scroll type or a reciprocating type may be used as the compression mechanism unit.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Motor 4 Rotating shaft 30 Rotor 31 Rotor core 31a Hole part 33 Rivet 36 End plate 40 Stator 41 Stator core 42 Coil 51 Balance weight 51a The part which overlaps with a magnet 61 1st magnet 62 2nd magnet S1 1st 1 fixed position S2 2nd fixed position G Gap

Claims (4)

A rotor core (31);
A first magnet (61) and a second magnet (62) fixed in the rotor core (31) and adjacent in the circumferential direction;
A balance weight (51) which is attached to at least one end face side in the axial direction of the rotor core (31) and is made of a magnetic material;
The balance weight (51) is fixed to the rotor core (31) at the first fixed position (S1) and the second fixed position (S2),
The first fixed position (S1) is located radially outside the rotor core (31) with respect to the first magnet (61), and the second fixed position (S2) is the second magnet (62). ) In the radial direction of the rotor core (31),
The rotor, wherein the radially outer magnetic pole of the first magnet (61) and the radially inner magnetic pole of the second magnet (62) have the same polarity. The rotor according to claim 1, wherein
A portion (51a) of the balance weight (51) overlapping the magnets (61, 62) as viewed from the axial direction of the rotor core (31) has a gap (G) between the rotor core (31). Rotor. A rotor (30) according to claim 1 or 2,
A motor comprising: a stator (40) arranged so as to surround an outer peripheral side of the rotor (30). A sealed container (1);
A compression mechanism (2) disposed in the sealed container (1);
The compressor (3) according to claim 3, wherein the compressor (3) is disposed in the hermetic container (1) and drives the compression mechanism (2) via a rotating shaft (4). .

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