JP2013219925A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that holds a stator core while preventing laminated steel sheets from being delaminated and the stator core from getting thinner.SOLUTION: A rotary electric machine 10 includes: a stator core 12 that has laminated steel sheets each having an opening and that is shaped like a cylinder with a hollow portion 18; a rotor core 14 that is arranged in the hollow portion 18; and support means 16 that supports an outer circumferential surface 20 of the stator core 12.

Description

  The present invention relates to a rotating electrical machine.

  A rotating electrical machine rotates a rotor (rotor) by a rotating magnetic field generated from a stator (stator). When rotating the rotor, the stator receives a reaction force in a direction opposite to the rotation of the rotor. In order to prevent the stator from moving even if it receives a reaction force, the stator is supported by the support means.

  Conventionally, for example, as shown in FIG. 9, the stator core 112 is fixed by screwing bolts 111 into the stator core 112 and the housing 114. The bolt 111 is screwed into the stator core 112 and the housing 114 from the direction along the rotation axis C of the rotor 110. In this fixing, a force in the direction of the rotation axis C of the rotor 110 is applied to the stator core 112.

  Here, the stator core 112 may be composed of laminated steel plates. The laminated steel sheet is formed by stacking a plurality of thin disk-shaped steel sheets 116 in the direction of the rotation axis C via an insulating layer 118.

  When a force in the rotation axis C direction, that is, a force in the laminating direction of the steel plates 116 is applied to the stator core 112 made of laminated steel plates, the insulating layer 118 is deformed and contracted by a so-called creep phenomenon. As a result, the thickness of the stator core 112 in the stacking direction is reduced (the stator core 112 can be thinned). At this time, as shown in FIG. 10, the end 120 of the rotor 110 protrudes from the stator core 112, and the magnetic field exerted on the end 120 of the rotor 110 from the stator core 112 is weakened. As a result, the output obtained from the rotor 110 per current amount supplied to the stator may be reduced.

  Therefore, in Patent Document 1, for example, the embedding direction of the bolt 111 is determined not in the stacking direction of the stator core 112 but in the radial direction. Specifically, as shown in FIG. 11, bolt holes are drilled between the steel plates 116 from the outer peripheral surface of the stator core 112 toward the central axis C. When fixing the stator core 112 to the housing 114, the bolt holes of the stator core 112 and the bolt holes of the housing 114 are aligned, and then the bolts 111 are screwed into the bolt holes. By doing in this way, it can avoid applying the load of the lamination direction to the stator core 112. FIG.

JP 2010-74979 A

  By the way, when the bolt is embedded between the steel plate layers, another problem arises that the steel plate around the bolt is peeled off. For example, as shown in FIG. 11, when a load (thrust load) in the direction of the rotation axis C is applied to the housing 114, the first steel plate 116 </ b> A around the bolt 111 and on the rear housing 114 </ b> B side is around the bolt 111. The bolt 111 receives a force that allows the second steel plate 116B on the front housing 114A side to be peeled off. Then, an object of this invention is to provide the rotary electric machine which can hold | maintain a stator core, suppressing peeling of a steel plate and the fading of a stator core.

  The present invention relates to a rotating electrical machine. The rotating electrical machine includes a stator core having a cylindrical shape in which steel plates having openings are stacked and provided with a hollow portion, a rotor core disposed in the hollow portion, and a support unit that supports an outer peripheral surface of the stator core.

  Further, in the above invention, the stator core has a convex portion that protrudes radially outward along the stacking direction of the steel plates, and the support means supports the stator core from an outer peripheral surface of the convex portion. Is preferred.

  In the above invention, it is preferable that the convex portion has two faces facing each other, and the supporting means supports the stator core with the two faces facing each other in between.

  According to the present invention, it is possible to hold the stator core while suppressing peeling of the steel plate and thinning of the stator core.

It is a perspective view which illustrates the rotary electric machine which concerns on this embodiment. It is a perspective view which illustrates the rotor core of the rotary electric machine which concerns on this embodiment. It is a front view which illustrates another example composition of the rotor core of the rotation electrical machinery concerning this embodiment. It is a front view which illustrates another example composition of the rotor core of the rotation electrical machinery concerning this embodiment. It is a perspective view which illustrates the support means of the rotary electric machine which concerns on this embodiment. It is a perspective view which illustrates the assembly process of the rotary electric machine which concerns on this embodiment. It is front sectional drawing which illustrates the rotary electric machine which concerns on this embodiment. It is front sectional drawing which illustrates another example structure of the rotary electric machine which concerns on this embodiment. It is side surface sectional drawing which illustrates the conventional rotary electric machine. It is side surface sectional drawing which illustrates the conventional rotary electric machine. It is side surface sectional drawing which illustrates the conventional rotary electric machine.

  FIG. 1 illustrates a rotating electrical machine 10 according to the present embodiment. The rotating electrical machine 10 includes a stator core 12, a rotor core 14, and support means 16. In FIG. 1, in order to make the configuration and arrangement of the stator core 12, the rotor core 14, and the support means 16 easier to see, a part of the casing 26 is not shown.

  The rotor core 14 is a component part of a rotor (rotor). The rotor core 14 is rotated by a rotating magnetic field generated from the stator (stator) side. The rotor core 14 may be in a shape that can be disposed in the hollow portion 18 of the stator core 12, and may be, for example, a cylindrical shape.

  The stator core 12 is a component part of the stator (stator). The stator core 12 acts as a magnetic path for the rotating magnetic field. Specifically, the stator core 12 is provided with teeth 13 serving as magnetic poles. A coil (not shown) is wound around the teeth 13. When an alternating current is passed through the coil, a rotating magnetic field is generated from the coil. The magnetic flux of the rotating magnetic field flows through the stator core 12.

  The stator core 12 has a cylindrical shape with a hollow portion 18 as shown in FIG. The stator core 12 is formed by laminating steel plates having openings. An adhesive layer (not shown) for bonding adjacent steel plates is provided between the steel plates.

  A convex portion 22 may be provided on the outer peripheral surface 20 of the stator core 12. A plurality of the convex portions 22 may be provided. In that case, it is preferable that the convex portions 22 are equally arranged along the circumferential direction of the stator core 12.

  The convex portion 22 is formed so as to protrude outward in the diameter R direction of the stator core 12 along the lamination direction A of the steel plates of the stator core 12. The convex portion 22 may extend from one end surface 23A of the stator core 12 to the other end surface 23B.

  Further, the convex portion 22 may be provided with side surfaces 24A and 24B facing each other. The side surfaces 24 </ b> A and 24 </ b> B may be provided so as to be parallel along the diameter R direction of the stator core 12. Alternatively, as shown in FIG. 3, the side surfaces 24 </ b> A and 24 </ b> B may be provided so as to have a widened shape (C shape) that expands toward the outside of the diameter R when viewed from the end surface 23 of the stator core 12. Alternatively, as shown in FIG. 4, the side surfaces 24 </ b> A and 24 </ b> B may be provided so as to have a reduced width shape (inverted C shape) that becomes narrower toward the outside of the diameter R. As will be described later, from the viewpoint of suppressing the circumferential movement of the stator core 12, the side surfaces 24A and 24B are formed to be parallel to the diameter R direction of the stator core 12 or to have a widened shape. Is preferred.

  The support means 16 supports the outer peripheral surface 20 of the stator core 12 and holds the stator core 12. As shown in FIG. 5, the support means 16 may be provided in a casing 26 that houses the stator core 12.

  The support means 16 may be formed so as to support the stator core 12 from the outer peripheral surface 20 of the convex portion 22 of the stator core 12. For example, the support unit 16 may support the stator core 12 by sandwiching both side surfaces 24A and 24B of the convex portion 22. In this case, the support unit 16 may include a first support unit 30 that supports one side surface 24A of the convex portion 22 and a second support unit 32 that supports the other side surface 24B.

  The first support means 30 may be fixed to the casing 26 or integrated with the casing 26. The first support means 30 is extended along the central axis C of the casing 26, and the extension length L 1 is equal to or longer than the extension length L 2 (see FIG. 2) of the convex portion 22 of the stator core 12. It is formed to become.

  Further, stoppers 33 may be provided at both ends of the first support means 30 in the direction of the central axis C. The stopper 33 is a member for restricting the movement of the stator core 12 in the direction of the central axis C. The first support means 30 and the stopper 33 may be formed integrally with the casing 26. The stopper 33 and the first support means 30 form a U-shaped slot. The circumferential width W1 of the stopper 33 is preferably less than the circumferential width W2 of the convex portion 22 of the stator core 12 (see FIG. 2).

  The second support means 32 is configured such that a force is applied to the first support means 30 side. For example, the 2nd support means 32 may be comprised so that force may be applied to the 1st support means 30 side by fastening means 34, such as a volt | bolt. At this time, it is preferable that the fastening means 34 is configured not to be embedded in the stator core 12. For example, the second support means 32 is configured in a flat plate shape, and the length L3 along the central axis C is equal to or longer than the length L4 along the central axis C of the stopper 33 and the first support means 30. You may comprise as follows. Further, bolt holes 36 and 38 may be provided in both ends of the second support means 32 in the direction along the central axis C and the stopper 33, respectively. The bolt hole 38 of the stopper 33 may be threaded.

  FIG. 6 illustrates a state in which the stator core 12 is supported by the support means 16. The convex portion 22 of the stator core 12 is disposed in the slot formed by the stopper 33 and the first support means 30. At this time, as described above, since the circumferential width W1 of the stopper 33 is less than the circumferential width W2 of the convex portion 22 of the stator core 12, a part of the convex portion 22 protrudes from the stopper 33. The protruding portion is pressed by the second support means 32.

  After the second support means 32 is disposed on the side surface 24B of the convex portion 22, the fastening means 34 is inserted into the bolt holes 36 and 38 and screwed. Thereby, as shown in FIG. 7, the 2nd support means 32 is pressed down by the 1st support means 30 side. As a result, the convex portion 22 of the stator core 12 sandwiched between the first support means 30 and the second support means 32 is pressed from the circumferential direction of the stator core 12. The force applied in the circumferential direction of the stator core 12, that is, the reaction force received by the stator core 12 when trying to rotate the rotor core 14, is received by the first support means 30 and the second support means 32, and the movement of the stator core 12 is performed. Is prevented.

  Here, it is preferable to provide a working space in the casing 26 in order to enable the fastening means 34 to be screwed. For example, the distance L5 along the insertion direction of the fastening means 34 between the surface of the stopper 33 where the bolt hole 38 is provided and the inner surface 40 of the casing 26 facing this surface is the length of the fastening means 34 in the axial direction. L6 or more is preferable. Furthermore, it is preferable to provide a gap for inserting a fastening tool such as a ratchet wrench between the casing 26 and the stator core 12.

  In the above-described embodiment, the convex portion 22 is provided in the stator core 12 and the first support means 30 and the second support means 32 that sandwich the convex portion 22 are provided in the casing 26. However, the present invention is not limited to this configuration. . For example, the convex portion 22 may be omitted from the stator core 12. In this case, as shown in FIG. 8, support means 16 that supports the outer peripheral surface 20 of the stator core 12 may be provided in the casing 26.

  The support means 16 may be configured to press the outer peripheral surface 20 of the stator core 12 toward the inner side in the diameter R direction of the stator core 12. A plurality of support means 16 may be provided, and at least one of the support means 16 is preferably capable of moving the support surface 42 along the diameter R direction of the stator core 12. For example, the position of the support surface 42 may be adjusted by screwing the adjustment screw 44.

  The support means 16 is configured to hold the stator core 12 against a force that attempts to rotate the stator core 12 in the circumferential direction. Specifically, the reaction force received by the stator core 12 when the rotor core 14 is about to rotate is F, the coefficient of static friction between the outer peripheral surface 20 of the stator core 12 and the support surface 42 of the support means 16 is μ, and the support means 16 is The support means 16 is configured such that F <μN, where N is the force pressing toward the inside of the stator core 12 in the diameter R direction.

DESCRIPTION OF SYMBOLS 10 Rotary electric machine, 12 Stator core, 13 Teeth, 14 Rotor core, 16 Support means, 18 Hollow part, 20 Outer peripheral surface, 22 Convex part, 23 End surface, 24 Side surface, 26 Casing, 30 1st support means, 32 2nd support Means, 33 stopper, 34 fastening means, 36 bolt hole of the second support means, 38 bolt hole of the stopper, 40 inner surface of the casing, 42 support surface, 44 adjusting screw.

Claims (3)

A stator core having a cylindrical shape with laminated steel plates having openings and a hollow portion;
A rotor core disposed in the hollow portion;
Support means for supporting the outer peripheral surface of the stator core;
A rotating electric machine comprising: The rotating electrical machine according to claim 1,
The stator core has a protrusion protruding outward in the radial direction along the lamination direction of the steel plates,
The rotating electrical machine, wherein the support means supports the stator core from an outer peripheral surface of the convex portion. The rotating electrical machine according to claim 2,
The convex portion has two faces facing each other,
The rotating electrical machine is characterized in that the support means supports the stator core by sandwiching the two faces facing each other.

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