JP2017055582A - Stator and electric motor having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator capable of enhancing reliability and preventing increase of rotation loss by surely holding and fixing an inter-phase insulation member to surely perform insulation between adjacent coils, and an electric motor having the same.SOLUTION: In a stator 12, an inter-phase insulation member 16 includes a pair of contact pieces 16C which are respectively in contact with coils 13 of different phases in each slot 14a, and a connecting portion (a first bent portion 16A and a pair of second bent portions 16B) connected to the pair of contact pieces 16C. The pair of contact pieces 16C are held by a core 14 and the coils 13 in contact with the coils 13 while having elastic restoring force acting in a direction in which the pair of contact pieces 16C separate from each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator of an electric motor used for industrial equipment, office equipment, and household appliances, and an electric motor including the same.

  There has been proposed a stator for holding an interphase insulating member by forming a holding groove at the tip of the tooth portion of the core or the tip of the insulator and inserting a part of the interphase insulating member into the holding groove (for example, , See Patent Document 1).

JP 2010-246325 A

  In the stator disclosed in Patent Document 1, a holding groove is formed. However, since the interphase insulating member has a thickness of about 0.1 mm, it is difficult to provide a groove having a width of 0.1 mm in the component. . Further, if the width of the holding groove is increased, the interphase insulating member cannot be reliably fixed, and the interphase insulating member may fall off. Even if the interphase insulating member does not drop off, the interphase insulating member flutters due to the wind pressure due to the rotation of the rotor, the airflow is disturbed, and the rotation loss increases.

  Therefore, the present invention reliably holds and fixes the interphase insulating member, and reliably performs insulation between adjacent coils, thereby improving the reliability and preventing an increase in rotational loss and the stator An object is to provide an electric motor provided.

  In order to achieve the above object, the stator of the present invention includes a core having a plurality of teeth arranged in a ring and forming a plurality of slots, a coil formed by winding an electric wire around each tooth, A slot insulating member disposed in the slot and interposed between the core and the coil to insulate the core and the coil; an interphase insulating member disposed between the coils of different phases in each slot; The interphase insulating member includes a pair of contact pieces that contact the coils of different phases in each slot, and a connection portion to which the pair of contact pieces are connected, and the pair of contact pieces The core and the coil are held in contact with the coil while having an elastic restoring force toward the side away from each other.

  The electric motor includes the stator and a rotor that is rotatably accommodated inside the stator.

  According to the present invention, a stator capable of improving reliability and preventing an increase in rotation loss by securely holding and fixing an interphase insulating member and reliably performing insulation between adjacent coils, and a An electric motor can be provided.

The longitudinal cross-sectional view of the hermetic scroll compressor carrying the electric motor which concerns on embodiment of this invention is shown. FIG. 2 shows a cross-sectional view of the stator along the line II-II in FIG. 1. The enlarged view of slot insulation member and an interphase insulation member vicinity is shown.

  Hereinafter, a stator according to an embodiment of the present invention and an electric motor including the stator will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a hermetic scroll compressor 10 (hereinafter simply referred to as a compressor 10) provided with a DC concentrated winding permanent magnet type motor 1 (hereinafter simply referred to as a motor 1) in the present embodiment. FIG. 2 is a sectional view of the stator 12 taken along the line II-II in FIG.

  As shown in FIG. 1, the compressor 10 mainly includes a sealed container 3 that also serves as a pressure container, an electric motor 1, and a compression mechanism unit 2.

  The electric motor 1 is a DC concentrated winding permanent magnet electric motor, and includes a stator 12 and a rotor 11. The stator 12 is fixed to the inner wall of the sealed container 3. The rotor 11 is rotatably accommodated inside the stator 12 with a slight gap (air gap) between the rotor 11 and the stator 12. The rotor 11 has a rotor body made of laminated electromagnetic steel sheets and a plurality of permanent magnets embedded in the rotor body.

  The compression mechanism unit 2 includes a drive shaft 21, a gas compression unit 22, a main bearing frame 23, and a sub bearing frame 24.

  The main bearing frame 23 has a main bearing 231 and is fixed to the inner wall of the sealed container 3 on the upper side of the electric motor 1. The auxiliary bearing frame 24 has an auxiliary bearing 241 and is fixed to the inner wall of the hermetic container 3 on the lower side of the electric motor 1. The drive shaft 21 is attached to the rotor 11 and is rotatably supported with respect to the main bearing 231 and the auxiliary bearing 241.

  The gas compression part 22 is a scroll type gas compression part, and the drive shaft 21 is connected thereto. The rotation of the rotor 11 is transmitted to the gas compression unit 22 via the drive shaft 21, the gas is compressed by the gas compression unit 22, and the compressed gas is discharged out of the sealed container 3.

  As for the power supply to the electric motor 1, a hermetic terminal 31 is provided on the side surface of the hermetic container 3, and power is supplied from the outer side to the inner side of the hermetic container 3 through the hermetic terminal 31 and the lead wire 122.

  As shown in FIG. 2, the stator 12 includes a coil 13, a lead wire 122 (FIG. 1), a core 14, an insulator 124 (FIG. 1), a slot insulating member 15, and an interphase insulating member 16. .

  The core 14 is configured by a laminate in which electromagnetic steel sheets are laminated by welding, bonding, or caulking. The core 14 has a cylindrical yoke 17 and a plurality of teeth 18 arranged in an annular shape. A plurality of slots 14 a are formed by the yoke 17 and the adjacent tooth portion 18.

  The coil 13 is formed by winding an electric wire (copper wire) around the tooth portion 18. The lead wire 122 is connected to the end of the coil 13.

  The insulators 124 are provided at both ends of the core 14 in the axial direction of the drive shaft 21. The insulator 124 prevents the coil 13 from coming into contact with both end surfaces in the axial direction of the drive shaft 21 of the core 14 and electrically insulates the coil 13 and the core 14.

  The slot insulating member 15 is interposed between the coil 13 and the core 14 in the slot 14a, and electrically insulates the coil 13 and the core 14. The interphase insulating member 16 is interposed between the coils 13 of different phases adjacent to each other in the slot 14a, and electrically insulates the adjacent coils 13 from each other. The slot insulating member 15 and the interphase insulating member 16 are made of, for example, a single film-like resin material. The slot insulating member 15 and the interphase insulating member 16 are provided from one end to the other end of the core 14 in the axial direction.

  Next, detailed configurations of the slot insulating member 15 and the interphase insulating member 16 will be described with reference to FIG.

  FIG. 3 shows an enlarged view of the vicinity of the slot insulating member 15 and the interphase insulating member 16.

  The tooth portion 18 includes a base portion 18A that protrudes inward in the radial direction from the yoke 17, and a pair of protrusion portions 18B that are provided at the distal end portion of the base portion 18A and protrude on both sides in the circumferential direction. An adjacent opening 18B forms an opening 18c that opens in the radial direction.

  The slot insulating member 15 includes a main body portion 15A and a pair of groove forming portions 15B. The main body portion 15A is provided along the inner periphery of the slot 14a and has a pair of end portions 15C in the vicinity of the opening 18c. Each groove forming portion 15B is bent from each end portion 15C and extends toward the inside of the slot 14a, and forms a groove portion 15d together with the coil 13. The width of the groove 15 d is configured to be approximately equal to the thickness of the interphase insulating member 16.

  The interphase insulating member 16 is formed by bending a film-like resin material, and has a substantially V shape. The interphase insulating member 16 includes a first bent portion 16A, a pair of second bent portions 16B, and a pair of contact pieces 16C. The first bent portion 16A and the pair of second bent portions 16B correspond to connecting portions, and are formed by bending a film-like resin material. The first bent portion 16A is located at the center of the interphase insulating member 16, and is in contact with the yoke 17 via the main body portion 15A.

  The pair of second bent portions 16B are formed by bending portions that are separated from the first bent portion 16A by a predetermined distance. The pair of contact pieces 16C are connected to the second bent portion 16B, respectively. The tip of each contact piece 16C is inserted into the groove 15d and sandwiched between the groove forming part 15B and the coil 13. Each contact piece 16C is in contact with the coil 13 while having an elastic restoring force toward the side away from each other by each second bent portion 16B. That is, when the pair of contact pieces 16C is not inserted between the adjacent coils 13, the distance between the pair of contact pieces 16C is configured to be larger than the distance between the adjacent coils 13. The interphase insulating member 16 is inserted between the adjacent coils 13 in a state where the pieces 16C are brought close to each other and the interphase insulating member 16 is elastically deformed.

  As described above, the interphase insulating member 16 is in contact with the coil 13 while the pair of contact pieces 16C have elasticity, and the core 14 and the coil 13 are inserted in the state where the tip ends of the pair of contact pieces 16C are inserted into the groove portions. Retained.

  As described above, in the stator 12 of the present embodiment, the interphase insulating member 16 is connected to the pair of contact pieces 16C and the pair of contact pieces 16C that are in contact with the coils 13 of different phases in each slot 14a. Connecting portions (first bent portion 16A and a pair of second bent portions 16B), and the pair of contact pieces 16C are in contact with the coil 13 while having an elastic restoring force toward the side away from each other. In the state, it is held by the core 14 and the coil 13.

  With this configuration, the interphase insulating member 16 can be reliably held by the core 14 and the coil 13, and insulation between adjacent coils 13 can be reliably performed. As a result, it is possible to prevent the interphase insulating member 16 from fluttering due to the wind pressure due to the rotation of the rotor 11, and thus it is possible to prevent an increase in the rotation loss of the electric motor 1 due to the turbulence of the airflow. Therefore, the reliability of the electric motor 1 including the stator 12 can be improved.

  The interphase insulating member 16 is made of a film-like resin material. By bending the film-like resin material, the first bent portion 16A, the pair of second bent portions 16B, and the pair of contact pieces 16C. And are configured. Therefore, the interphase insulating member 16 can be manufactured easily and inexpensively. As a result, the stator 12 and the electric motor 1 can be manufactured easily and inexpensively.

  The interphase insulating member 16 includes a first bent portion 16A and a pair of second bent portions 16B formed on both sides of the first bent portion 16A, and each contact with each second bent portion 16B. The piece 16C is connected. According to this configuration, each of the second bent portions 16B can generate a large elastic restoring force in each of the contact pieces 16C, so that the interphase insulating member 16 is securely held and fixed to the core 14 and the coil 13. be able to.

  The slot insulating member 15 includes a main body portion 15A having a pair of end portions 15C in the vicinity of the opening 18c, and is bent from each end portion 15C of the main body portion 15A and extends toward the inside of the slot 14a. A pair of groove forming portions 15B for forming the groove portions 15d, and the interphase insulating member in a state where the tip portions of the contact pieces 16C are inserted into the groove portions 15d and sandwiched between the groove forming portions 15B and the coils 13 16 is held by the core 14 and the coil 13.

  With this configuration, the interphase insulating member 16 can be more securely held and fixed to the core 14 and the coil 13. As a result, it is possible to prevent the interphase insulating member 16 from fluttering due to the wind pressure due to the rotation of the rotor 11, and thus it is possible to prevent an increase in the rotation loss of the electric motor 1 due to the turbulence of the airflow.

  In addition, this invention is not limited to the Example mentioned above. A person skilled in the art can make various additions and changes within the scope of the present invention.

  For example, although the number of slots of the stator 12 is nine, the number of slots is not limited to this. Moreover, although the interphase insulating member 16 has the first bent portion 16A and the pair of second bent portions 16B, only the first bent portion 16A may be provided. Further, the first bent portion 16A may not be completely bent and may have a curved shape.

DESCRIPTION OF SYMBOLS 1 Electric motor 11 Rotor 12 Stator 13 Coil 14 Core 14a Slot 15 Slot insulation member 15A Main-body part 15B Groove formation part 15C End part 16 Interphase insulation member
16A 1st bending part 16B 2nd bending part 16C Contact piece 18 Tooth part 18c Opening part

Claims (5)

A core having a plurality of teeth arranged in a ring and forming a plurality of slots;
A coil formed by winding an electric wire around each tooth;
A slot insulation member disposed in each slot and interposed between the core and the coil to insulate the core and the coil;
An interphase insulating member disposed between the coils of different phases in each slot,
The interphase insulating member has a pair of contact pieces that respectively contact the coils of different phases in each slot, and a connection portion to which the pair of contact pieces are connected, and the pair of contact pieces are separated from each other A stator that is held by the core and the coil in a state of being in contact with the coil while having an elastic restoring force toward the side.   The interphase insulating member is made of a film-like resin material, and by bending the film-like resin material, a bent portion corresponding to the connecting portion and the pair of contact pieces connected to both sides of the bent portion The stator according to claim 1, wherein:   The bent portion includes a first bent portion and a pair of second bent portions formed on both sides of the first bent portion, and each contact piece is connected to each second bent portion. The stator according to claim 2. The slot insulating member is provided along an inner periphery of the slot, and a main body having a pair of end portions in the vicinity of an opening that insulates the core and the coil and opens in the radial direction of the slot; A pair of groove forming portions that are bent from each end portion of the main body portion and extend toward the inside of the slot and form a groove portion together with the coil,
4. The interphase insulating member is held by the core and the coil in a state in which a distal end portion of each contact piece is inserted into each groove portion and sandwiched between each groove forming portion and the coil. The stator according to any one of claims. The stator according to any one of claims 1 to 4,
And a rotor that is rotatably accommodated inside the stator.

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