JP2019146428A - Stator, motor, compressor, and stator manufacturing method - Google Patents

Abstract

To provide a stator, a motor, a compressor, and a stator manufacturing method in which iron loss due to caulking is suppressed.SOLUTION: A stator 11 includes: a stator core 12 formed by caulking in a region where a plurality of laminated plates 12a is in contact with an outer periphery; and a winding 13 wound around a portion of the stator core with concentrated winding in a state where the plurality of laminated plates 12a is caulked.SELECTED DRAWING: Figure 3A

Description

  The present disclosure relates to a stator, a motor, a compressor, and a method for manufacturing a stator.

  A DC motor (electric motor) mounted on various electric devices such as an air conditioner and a refrigeration apparatus includes a substantially cylindrical stator (stator) that generates a rotating magnetic field, and a rotor (rotor) that is rotatably provided to the stator. ). As a method of manufacturing a stator magnetic core (stator core) that suppresses iron loss due to eddy current, for example, a laminated plate obtained by punching a magnetic steel plate, which is a soft magnetic material, with a mold is laminated in the axial direction of the motor output shaft, and caulking or the like. There is a method of forming a block shape by integrating them. A stator having such a laminated plate is disclosed in Patent Document 1, for example.

JP 2017-229147 A

  Patent Document 1 discloses that a plurality of laminated cores are fastened and fixed to each other by caulking provided in a yoke portion of the laminated core to form a stator core. However, since the magnetic flux passage is formed in the vicinity of the yoke portion, it is not preferable that the yoke portion is caulked from the viewpoint of suppressing iron loss. For this reason, a motor having a stator that suppresses iron loss due to caulking is desired.

  An object of the present disclosure is to provide a stator, a motor, a compressor, and a method of manufacturing a stator that suppress iron loss due to caulking.

  The stator according to the present disclosure includes a stator core formed by caulking in a region where a plurality of laminated plates are in contact with the outer periphery, and a plurality of the laminated plates are caulked around a part of the stator core in a concentrated manner. And having a winding.

  The motor according to the present disclosure includes the above-described stator and a rotor that is disposed at a position facing the stator.

  The compressor of this indication is provided with the motor which has the above-mentioned stator and the rotor arranged at the position which counters the stator.

  In the stator manufacturing method of the present disclosure, a plurality of laminated plates are caulked in a region in contact with the outer periphery to form a stator core, and the plurality of laminated plates are caulked in a concentrated winding around a part of the stator core. Formed windings.

  According to the present invention, iron loss due to caulking can be suppressed.

The exploded perspective view of the motor which has a stator concerning the present invention Sectional view in a plane perpendicular to the axial direction of the stator core Side view of stator core Enlarged view of caulking section A plan view showing an example of a laminate used in a conventional motor Plan view of insulator Insulator side view The figure for demonstrating the connection relation of a stator core and an insulator Cross-sectional schematic view of the stator core with the winding wound around the teeth The figure for demonstrating the compressor with which the motor which has a stator core which concerns on this invention was used

  Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings. However, a more detailed description than necessary, for example, a detailed description of already well-known matters or a duplicate description of substantially the same configuration may be omitted. The following description and the drawings referred to are provided for those skilled in the art to understand the present disclosure, and are not intended to limit the scope of the claims of the present disclosure.

  Hereinafter, embodiments of the stator according to the present invention will be described. FIG. 1 is an exploded perspective view of a motor having a stator according to the present invention.

<Configuration of motor 100>
As shown in FIG. 1, the motor 100 includes a stator 11 and a rotor 21.

  In the following description, the circumferential direction refers to a direction along the outer periphery of the stator 11 having a substantially hollow cylindrical shape. The radial direction refers to the radial direction of the stator 11. The axial direction refers to a direction along the central axis of the stator 11 having a substantially cylindrical shape.

  As shown in FIG. 1, the stator 11 has a stator core 12 and a winding 13. Insulators 18 are disposed at both ends of the stator core 12 in the axial direction. The winding 13 is formed by winding an insulated wire 13a such as an enameled wire around the stator core 12 with concentrated winding (direct winding) through the insulator 18.

  In addition, as shown in FIG. 1, the rotor 21 is disposed inside the stator 11 so as to face the stator 11. The rotor 21 has a rotor core 22 and a shaft 23. The rotor core 22 is supported to be rotatable with respect to the stator 11. The rotor core 22 is formed, for example, by laminating electromagnetic steel plates or by hardening magnetic powder.

  As shown in FIG. 1, a plurality of permanent magnets 24 are attached to the side wall of the rotor core 22 along the circumferential direction. The plurality of permanent magnets 24 are arranged so that the directions of the magnetic poles are alternately reversed.

  A shaft 23 is provided at the center of the rotor core 22. The rotor core 22 is fixed to the shaft 23, and the shaft 23, the rotor core 22 and the permanent magnet 24 can rotate together.

  The surface of the permanent magnet 24 attached to the rotor 21 and the inner peripheral surface 11a of the stator 11 are arranged so as to face each other through an air gap.

<Description of Stator Core 12>
Next, the stator core 12 will be described in detail. FIG. 2 is a cross-sectional view in a plane perpendicular to the axial direction of the stator core 12.

  As shown in FIG. 2, the stator core 12 has a yoke 14 and teeth 15. The yoke 14 is a portion that becomes a magnetic flux path. Teeth 15 having a shape protruding toward the central axis is provided on the inner peripheral side of the yoke 14. In addition, although the example in which the stator core 12 has the six teeth 15 was shown in FIG. 2, this invention is not limited to this.

  A slot 16 that is a gap is formed by the yoke 14 positioned on the outer peripheral side of the stator core 12 and the two adjacent teeth 15. Although not shown in FIG. 2, the insulated wire 13 a is wound around each of the teeth 15 via the insulator 18 by concentrated winding (direct winding) to form the winding 13 (see FIG. 1). Accordingly, at least a part of the winding 13 is disposed in the slot 16.

  FIG. 3A is a side view of the stator core 12. The vertical direction in FIG. 3A corresponds to the axial direction of the stator core 12. As shown in FIG. 3A, the stator core 12 is formed by laminating and joining a plurality of laminated plates 12a along the axial direction.

  The laminated plate 12a is formed by punching out a thin plate of an electromagnetic steel plate, for example. The laminated plate 12a is formed in a shape as shown in FIG. As shown in FIGS. 2 and 3A, a crimping portion 17 is provided in a region in contact with the outer periphery of the laminated plate 12a. As shown in FIG. 3B, the caulking portion 17 is generated by caulking (caulking processing is performed) in a region in contact with the outer periphery of the laminated plate 12a in a state where a plurality of laminated plates 12a are laminated. FIG. 3B is an enlarged view of the caulking portion 17. In addition, although the laminated board 12a showed the example which has the six crimping parts 17 in FIG. 2, this invention is not limited to this, The number of the crimping parts 17 may be many.

  Hereinafter, the reason why the caulking portion 17 for joining the plurality of laminated plates 12a is provided in a region in contact with the outer periphery of the laminated plate 12a is used in a conventional motor (not shown) illustrated in FIG. This will be described in comparison with the laminated plate 112a. FIG. 4 is a plan view showing an example of a laminated plate 112a used in a conventional motor. As shown in FIG. 4, the laminated plate 112 a used in the conventional motor is provided not in a region in contact with the outer periphery but in the vicinity of the central portion in the radial direction of the yoke 114, for example. The reason for this is that when the caulking portion 117 is provided in the central portion of the yoke 114, the laminated plates 112a are in contact with each other on both sides of the deformation of the caulking portion 117. It is because it is preferable in terms of the above.

  When the caulking portion 117 is provided near the central portion of the yoke 114 serving as a magnetic flux path as in the prior art, the iron loss of the yoke 114 may increase due to the caulking portion 117, and the motor characteristics may deteriorate. On the other hand, in the present invention, the caulking portion 17 is provided in a region in contact with the outer periphery of the laminated plate 12a in order to improve the motor characteristics, so that the influence of the caulking portion 17 on the motor characteristics can be minimized.

  However, when the caulking portion 17 is provided in the region in contact with the outer periphery of the laminated plate 12a as in the present invention, the bonding strength between the laminated plates 12a is weaker than that in the prior art. The bonding strength between the plates 12a is reinforced.

<Details of Manufacturing Method of Motor 100>
Below, the manufacturing method of the motor 100 which concerns on this invention is demonstrated in detail.

  First, the plurality of laminated plates 12 a are formed by electromagnetic steel plates punched into the cross-sectional shape of the stator 11.

  Next, the crimping part 17 is formed in the predetermined position which touches the outer periphery of the formed laminated board 12a. The shape and forming method of the crimped portion 17 are not particularly limited in the present invention. The caulking portion 17 has, for example, a round shape or a V shape, and may be formed by a punch or the like corresponding to the shape.

  And the heat processing with respect to the stator core 12 is implemented for a motor characteristic improvement (magnetic flux density improvement and / or iron loss reduction etc.). Furthermore, the stator core 12 may be subjected to a varnish treatment in which the varnish is impregnated and cured. Further, an insulating paper 19 (see FIG. 7) is inserted into the slot 16 for insulating the slots 16 from each other.

  Insulators 18 for insulation are connected to both sides in the axial direction of the stator core 12 on which a plurality of laminated plates 12a are laminated. 5A and 5B are diagrams for explaining the insulator 18. FIG. 6 is a diagram for explaining a connection relationship between the stator core 12 and the insulator 18.

  FIG. 5A is a plan view of the insulator 18, and FIG. 5B is a side view of the insulator 18. As shown in FIG. 5A, the insulator 18 has a substantially circular outer periphery, similar to the cross-sectional shape of the stator core 12 shown in FIG. A protrusion 18b is formed from the outer peripheral portion 18a of the insulator 18 toward the inner peripheral side. The shape and number of the protrusions 18b are formed in accordance with the teeth 15 of the stator core 12 shown in FIG. 2. When the insulator 18 is connected to the stator core 12, the protrusions 18b overlap the teeth 15. Be placed. In this state, as shown by the arrows in FIG. 6, the insulator 18 is connected from both sides along the stacking direction of the stator core 12.

  When the insulator 18 is connected to the stator core 12, the insulated wire (magnet wire) 13 a is wound around the stator core 12 and the insulator 18 via the insulating paper 19 by concentrated winding (direct winding), and the winding 13 is formed. The And the connection process of the coil | winding 13 is performed. Thereby, the winding wire 13 is accommodated in the slot 16.

  FIG. 7 is a schematic cross-sectional view of the teeth 15 of the stator core 12 with the winding 13 wound thereon. As shown in FIG. 7, the insulated wire 13a is wound in a concentrated winding (direct winding) around the plurality of laminated plates 12a joined to each other by the caulking portion 17, thereby further strengthening the joining between the plurality of laminated plates 12a. It will be something. In other words, the bonding strength of the plurality of laminated plates 12a is reinforced by the force with which the insulated wire 13a constituting the winding 13 is wound. With such a configuration, the stator core 12 in which the plurality of laminated plates 12a are firmly joined is formed. Therefore, even if vibration or the like occurs during driving of the motor 100, for example, the motor characteristics due to the deviation of the laminated plates 12a and the like. A decrease can be prevented.

  More preferably, the winding 13 may be varnished. A varnish layer 13b is formed on the winding 13 by the varnish treatment. Since the insulated wires 13a wound around the stator core 12 and the insulator 18 are cured by the varnish layer 13b, the joining of the laminated plates 12a in the stator core 12 becomes stronger.

<Action and effect>
As described above, the stator 11 according to the present invention includes the stator core 12 formed by caulking in a region where the plurality of laminated plates 12a are in contact with the outer periphery, and the stator core in a state where the plurality of laminated plates 12a are caulked. And a winding 13 that is partially wound around the winding.

  As described above, the caulking portion 17 is provided by being caulked in the region in contact with the outer periphery of the laminated plate 12 a, so that the magnetic flux path in the stator 11 is not easily affected by the caulking portion 17. For this reason, since the increase in the iron loss at the time of the motor 100 drive resulting from the crimping | crimped part 17 for joining the laminated plates 12a can be prevented, the highly efficient motor 100 can be provided.

  Then, after the laminated plates 12a are joined to each other by the caulking portion 17 provided in the region in contact with the outer periphery, the insulated wire 13a is wound around the laminated plates 12a by concentrated winding (direct winding), The plurality of laminated plates 12a can be firmly bonded to each other. Thereby, since the stator core 12 in which the plurality of laminated plates 12a are firmly joined is formed, for example, even when vibration or the like occurs when the motor 100 is driven, the laminated plates 12a are hardly displaced, and the laminated plates 12a are displaced. It is possible to prevent the motor characteristics from being deteriorated due to the above.

  Further, the winding 13 has a varnish layer 13b formed by curing the impregnated varnish. With such a configuration, the joining of the laminated plates 12a in the stator core 12 becomes stronger.

<Usage example>
The motor 100 having the stator 11 according to the present invention described above is preferably used in a compressor used for applications such as air conditioning or refrigeration. FIG. 8 is a view for explaining a compressor 200 in which the motor 100 having the stator core 12 according to the present invention is used.

  As shown in FIG. 8, the compressor 200 includes an airtight container 201, a motor 100 having a stator core 12 (not shown in FIG. 8) according to the present invention, a compression mechanism 202, and an oil separator 203. Have. The sealed container 201 is a cylindrical container formed of, for example, a steel plate. The motor 100 is disposed inside the sealed container 201. The compression mechanism unit 202 includes eccentric rollers 204a and 204b and cylinder chambers 205a and 205b.

  The compression mechanism unit 202 includes eccentric rollers 204a and 204b and cylinder chambers 205a and 205b. At the lower end of the shaft 23 of the motor 100, eccentric rollers 204a and 204b attached to an eccentric shaft whose axis is displaced are provided.

  When electric power is supplied to the motor 100 and the shaft 23 rotates, the eccentric rollers 204a and 204b rotate eccentrically. Thereby, the refrigerant gas introduced into the sealed container 201 from the outside is compressed in the cylinder chambers 205a and 205b.

  The refrigerant gas compressed in the cylinder chambers 205a and 205b flows into the oil separation unit 203 in a state of containing the lubricating oil of the compression mechanism unit 202 in a mist form. In the oil separation unit 203, the refrigerant gas is blown to the end of the winding 13 (not shown in FIG. 8) of the motor 100 and the insulator 18 disposed in the oil separation unit 203 by centrifugal force. Are preferably separated. The refrigerant gas subjected to the oil separation is led out of the compressor 200 from the discharge pipe.

  The present invention is useful as a stator for a motor used in a compressor.

DESCRIPTION OF SYMBOLS 100 Motor 11 Stator 11a Inner peripheral surface 12 Stator core 12a Laminated board 13 Winding 13a Insulated wire 13b Varnish layer 14 Yoke 15 Teeth 16 Slot 17 Caulking part 18 Insulator 18a Outer part 18b Protrusion part 19 Insulating paper 21 Rotor core 24 Rotor core 23 Shaft Magnet 112a Laminated plate 114 Yoke 117 Caulking part 200 Compressor 201 Sealed container 202 Compression mechanism part 203 Oil separation part 204a, 204b Eccentric roller 205a, 205b Cylinder chamber

Claims (6)

A stator core formed by caulking in a region where a plurality of laminated plates are in contact with the outer periphery;
A winding wound in a concentrated winding around a part of the stator core in a state where a plurality of the laminated plates are crimped;
Having a stator. The winding has a varnish layer formed by curing the impregnated varnish;
The stator according to claim 1. The winding is wound around the stator core via an insulator,
The stator according to claim 1 or 2. The stator according to any one of claims 1 to 3,
A rotor disposed at a position facing the stator;
Having a motor. A motor comprising the stator according to any one of claims 1 to 3 and a rotor disposed at a position facing the stator,
Compressor. A plurality of laminated plates are crimped in a region in contact with the outer periphery to form a stator core,
Forming a winding wound by concentrated winding around a part of the stator core in a state where a plurality of the laminated plates are caulked.
Stator manufacturing method.