JP2010081735A - Stator, motor and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator suppressing performance deterioration due to a caulking part and holding a strength of the caulking part. <P>SOLUTION: The stator is provided with a stator core 41 comprising a plurality of laminated magnetic steel sheets. The stator core 41 is provided with the caulking parts 48 fixing the plurality of magnetic steel sheets and a plurality of slot parts 47 which open to an inner peripheral side and are arranged in a circumferential direction. When the number of caulking parts 48 is Q, the number of slot parts 47 is S, and the weight of the stator core 41 is W (kg), they satisfy S>Q≥(W/3)×4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, a stator includes a stator core including a plurality of laminated electromagnetic steel sheets (see Japanese Patent No. 3586145: Patent Document 1). The stator core has a caulking portion that fixes the plurality of electromagnetic steel plates to each other, and has a plurality of slot portions that are open on the inner peripheral side and are arranged in the circumferential direction. The number of crimping portions is greater than the number of slot portions.
Japanese Patent No. 3586145

  However, in the conventional stator, since the number of the crimping portions is equal to or more than the number of the slot portions, there is a problem that the number of the crimping portions that adversely affect the magnetic flux path is increased and the performance is deteriorated. On the other hand, when the number of the crimping portions is simply reduced, the strength of the crimping portion is lowered, causing a problem of causing a decrease in rigidity and an increase in vibration.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator capable of suppressing deterioration in performance due to a caulking portion and maintaining the strength of the caulking portion, a motor using the stator, and a compressor using the motor.

In order to solve the above problems, the stator of the present invention is:
A stator core including a plurality of laminated electromagnetic steel sheets,
This stator core has a caulking portion that fixes the plurality of electromagnetic steel plates to each other, and a plurality of slot portions that are open on the inner peripheral side and arranged in the circumferential direction,
When the number of crimping parts is Q, the number of slot parts is S, and the weight of the stator core is W (kg),
S> Q ≧ (W / 3) × 4 is satisfied.

  According to the stator of the present invention, S> Q ≧ (W / 3) × 4, where Q is the number of crimped portions, S is the number of slot portions, and W (kg) is the weight of the stator core. Therefore, reducing the number of caulking parts prevents performance deterioration due to caulking parts and maintains the necessary strength of the caulking parts, thus preventing a decrease in rigidity and an increase in vibration.

  Moreover, in the stator of one Embodiment, all the center angles between the said crimping parts adjacent are equal.

  According to the stator of this embodiment, since the center angles between the adjacent caulking portions are all equal, it is possible to prevent the gap between the adjacent caulking portions from being biased and increase, thereby preventing a decrease in rigidity. it can.

The motor of the present invention
A rotor,
The stator is arranged to surround the outer peripheral side of the rotor.

  According to the motor of the present invention, since the stator is provided, it is possible to prevent performance degradation while preventing noise and vibration.

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 while being arrange | positioned in the said airtight container.

  According to the compressor of the present invention, since the motor is provided, it is possible to prevent deterioration in performance while preventing noise and vibration.

  According to the stator of the present invention, S> Q ≧ (W / 3) × 4, where Q is the number of crimped portions, S is the number of slot portions, and W (kg) is the weight of the stator core. Therefore, reducing the number of caulking parts prevents performance deterioration due to caulking parts and maintains the necessary strength of the caulking parts, thus preventing a decrease in rigidity and an increase in vibration.

  According to the motor of the present invention, since the stator is provided, it is possible to prevent performance degradation while preventing noise and vibration.

  According to the compressor of the present invention, since the motor is provided, it is possible to prevent deterioration in performance while preventing noise and vibration.

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

(First embodiment)
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 supplied from the suction pipe 11 is guided to the suction side of the compression mechanism unit 2. This refrigerant is carbon dioxide, but may be R410A, R22, or the like.

  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 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. This motor is a 6-pole motor.

  The rotor 30 includes a rotor core 31 and magnets 32 embedded in the rotor core 31 in the axial direction and arranged in the circumferential direction. Six magnets 32 are provided.

  As shown in FIGS. 1 and 2, the stator 40 includes a stator core 41 and a coil 42 wound around the stator core 41.

  The stator core 41 has an annular portion 45 and nine teeth portions 46 that protrude radially inward from the inner peripheral surface of the annular portion 45 and are arranged in the circumferential direction.

  The coil 42 is a concentrated winding that is not wound around the plurality of teeth portions 46 but is wound around the teeth portions 46. In FIG. 2, only a part of the coil 42 is drawn.

  The stator core 41 has nine slot portions 47 that open to the inner peripheral side and are arranged in the circumferential direction. That is, the slot portion 47 is formed between the adjacent tooth portions 46.

  The stator core 41 includes a plurality of laminated electromagnetic steel plates. The stator core 41 has a caulking portion 48 that fixes the plurality of electromagnetic steel plates to each other. Six crimping portions 48 are provided in the annular portion 45. The caulking portion 48 is located on the radially outer side of the slot portion 47.

  The annular portion 45 has a groove portion 45 a cut out from the outer peripheral surface on the radially outer side of the tooth portion 46. Nine groove portions 45 a are provided corresponding to the tooth portions 46. The groove 45a is used, for example, as a passage through which refrigerant or oil passes or a cooling passage.

  When the number of the caulking portions 48 is Q, the number of the slot portions 47 is S, and the weight of the stator core 41 is W (kg), S> Q ≧ (W / 3) × 4 is satisfied. In this embodiment, Q = 6, S = 9, W = 3.5 kg, and 9> Q (= 6)> 4.7 is satisfied.

  Therefore, since S> Q is satisfied, it is possible to prevent a decrease in performance due to the caulking unit 48 by reducing the number of the caulking units 48. On the other hand, when Q ≧ S, there is a problem that the number of caulking portions 48 increases and the performance decreases.

  Further, since Q ≧ (W / 3) × 4 is satisfied, the necessary strength of the caulking portion 48 is maintained, so that a decrease in rigidity and an increase in vibration are not caused. On the other hand, when (W / 3) × 4> Q, there is a problem that the strength of the caulking portion 48 is lowered, causing a decrease in rigidity and an increase in vibration.

  That is, as shown in FIG. 3, when the caulking holding load 3Q is equal to or greater than the required holding load 4W, the strength of the caulking portion 48 can be maintained, while when the caulking holding load 3Q is smaller than the required holding load 4W, The strength of the portion 48 cannot be maintained.

  Here, the basis of the number ((W / 3) × 4), which is the lower limit value of Q, will be described. Generally, the holding strength per one caulking portion 48 is about 3 kgf in the case of a static load. During actual operation of the compressor, a dynamic load is applied, and the dynamic load is about 3 to 4 times the static load. Therefore, it is set to 4 times in consideration of the certainty of the holding strength.

  As described above, since the holding strength of the caulking portion 48 is ensured, the stator core 41 can be fixed to the sealed container 1 by tack welding or the like as a gap fit. Therefore, the stress deformation of the stator core 41 due to the interference fit can be prevented, and the loss can be reduced.

  The core plate thickness is, for example, a 0.35 mm silicon steel plate, and an increase in iron loss due to stress or deformation becomes a serious problem as the core plate thickness decreases. Since it is reduced, an increase in iron loss due to stress and deformation can be prevented.

  In recent years, the demand for noise reduction is severe, and particularly in applications such as a water heater using a carbon dioxide refrigerant, there is a particularly high need for reducing the sound because of the use of nighttime power. In the present embodiment, instead of the conventional 4-pole DC motor, for example, a 6-pole DC motor is employed to reduce the rotation unevenness and realize the noise reduction. In the case of a 6-pole motor, the width of the annular portion 45 (yoke) of the stator core 41 is generally reduced in order to improve efficiency compared to a conventional 4-pole motor. However, since the quantity of the caulking portion 48 is reduced, it is possible to prevent a decrease in efficiency.

  Moreover, according to the motor of the said structure, since the said stator 40 is provided, the fall of a performance can be prevented, preventing a noise and a vibration.

  Moreover, according to the compressor of the said structure, since the said motor 3 is provided, the fall of a performance can be prevented, preventing a noise and a vibration.

(Second Embodiment)
FIG. 4 shows a second embodiment of the stator of the present invention. When the points different from the first embodiment are described, the shape of the stator core is different in the second embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the stator core 141 of the stator 140 of the second embodiment does not have the groove 45a of the first embodiment (FIG. 2), and the center angle between the adjacent caulking parts 48 is all. ,equal. The central angle between the adjacent caulking portions 48 is 60 °.

  According to the stator having the above configuration, since the center angles between the adjacent caulking portions 48 are all equal, it is possible to prevent the gap between the adjacent caulking portions 48 from becoming biased and to further prevent a decrease in rigidity. Can do.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, as the compression mechanism unit, a scroll type or a reciprocating type may be used in addition to the rotary type. The number of slot portions and the number of teeth portions can be freely increased or decreased.

  Further, the coil may be distributed winding that is not wound around each of the tooth portions but is wound over a plurality of tooth portions.

  Further, the position where the caulking portion is provided is not limited to the annular portion of the stator core, but may be provided in the tooth portion.

  Moreover, in all the caulking portions, at least one central angle among the central angles between the adjacent caulking portions in all the caulking portions may be different from the other central angles.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of a stator. It is a graph which shows the relationship between the number of crimps and a holding load. It is a top view of another stator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Motor 4 Rotating shaft 5 Crankpin 6 Piston 7 Compression chamber 8 Upper end part 9 Lower end part 11 Intake pipe 12 Discharge pipe 20 Main body part 21,22 Bearing 30 Rotor 31 Rotor core 32 Magnet 40,140 Stator 41 , 141 Stator core 42 Coil 45 Annular part 46 Teeth part 47 Slot part 48 Caulking part

Claims (4)

A stator core (41) including a plurality of laminated electromagnetic steel sheets;
The stator core (41) includes a caulking portion (48) that fixes the plurality of electromagnetic steel plates to each other, and a plurality of slot portions (47) that are open on the inner peripheral side and arranged in the circumferential direction.
When the number of the crimping parts (48) is Q, the number of the slot parts (47) is S, and the weight of the stator core (41) is W (kg),
A stator satisfying S> Q ≧ (W / 3) × 4. The stator according to claim 1,
The stator characterized in that all the center angles between the adjacent caulking portions (48) are equal. A rotor (30);
A motor comprising: the stator (40) according to claim 1 or 2 disposed 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);
A compressor comprising the motor (3) according to claim 3, which is disposed in the hermetic container (1) and drives the compression mechanism (2).

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