JP2011160509A - Stator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator device that improves material yields and does not require high part accuracy. <P>SOLUTION: The stator device includes: two or more split cores arranged adjacent to each other; and a thin plate formed by rolling a belt-like thin plate material into a cylindrical shape, and mounted around the outer circumference of the split cores. One end and the other end of the thin plate are welded each other in a circumferential direction, and furthermore split cores located in the welded part are also welded. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator used in a rotating electrical machine such as an electric motor or a generator.

  A rotating electrical machine mounted on a vehicle such as an automobile has a rotor and a stator disposed around the rotor. The stator includes a split core disposed adjacent to each other and a thin plate wound around the outer periphery of the split core, and the thin plate is fixed so as to tighten the split core (see, for example, Patent Document 1).

  In the stator of Patent Document 1, one end and the other end of the thin plate in the circumferential direction are fixed by welding to each other. Further, in order to position the split core in the circumferential direction, a sandwiching piece formed in a thin plate is fitted in a recess formed in the axial end surface of the split core.

JP 2007-195281 A

  However, in the stator of Patent Document 1, since it is necessary to form sandwiching pieces on a thin plate, the yield is poor, the press die for the thin plate becomes complicated, and the manufacturing process may increase. Further, in the manufacture of the stator, in order to position the split core in the circumferential direction, a process of fitting the sandwiching piece into the recess formed in the axial end surface of the split core is required, and the manufacturing process becomes complicated. In addition, in the process of fitting the sandwiching piece into the recess, etc., high component accuracy is required for both the split core and the thin plate, so that it is difficult to manage and maintain the dimensions of the component.

  An object of the present invention is to provide a stator that improves material yield and does not require high part accuracy.

  The present invention is a stator comprising a plurality of split cores arranged adjacent to each other, and a thin plate that is formed by rolling a strip-shaped thin plate material into a cylindrical shape and is mounted on the outer periphery of the split core, One end and the other end of the thin plate in the circumferential direction are welded to each other, and the split core located at the welding location is also welded.

  According to the present invention, it is possible to provide a stator that improves material yield and does not require high component accuracy.

It is a schematic cross section which shows an example of a structure of the rotary electric machine which concerns on this embodiment. It is a model perspective view which shows an example of a structure of a stator. It is a partial model perspective view which shows another example of a structure of the stator of this embodiment.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the rotating electrical machine according to the present embodiment. A rotating electrical machine 1 shown in FIG. 1 is a motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. The rotating electric machine means a motor generator having at least one of a function as a motor and a function as a generator (generator) when electric power is supplied.

  A rotating electrical machine 1 shown in FIG. 1 is housed in a motor case (not shown), and is installed in a rotor 10 rotatably supported by a bearing (not shown) provided in the motor case, and in the outer circumferential direction of the rotor 10. The stator 12 is provided.

  The rotor 10 has a rotor core 14 and permanent magnets (not shown) embedded in the rotor core 14 and rotates around a rotor shaft 16 supported by bearings. End plates 18 are provided on both axial end surfaces of the rotor core 14.

  The rotor core 14 has a cylindrical shape along the rotor shaft 16 and is composed of a plurality of electromagnetic steel plates 20a stacked in the axial direction. A plurality of permanent magnets (not shown) are embedded in the outer peripheral portion of the rotor core 14 at equal angles.

  The stator 12 includes a cylindrical stator core 26 and is disposed to face the rotor 10 via a predetermined gap. The stator core 26 is composed of a plurality of electromagnetic steel plates 20b stacked in the axial direction, but is not necessarily limited thereto, and may be composed of, for example, a dust core.

  As shown in FIG. 1, a coil end 30 formed in the circumferential direction is disposed at the end of the stator core 26. A slot is formed in the stator core 26 so as to penetrate the stator 12 in the axial direction, and a coil is wound around the slot. The end of the coil wound around the stator core 26 is formed as a coil end 30. The stator core 26 is composed of a plurality of electromagnetic steel plates 20b stacked in the axial direction, but is not necessarily limited thereto, and may be composed of, for example, a dust core.

  Although not shown, the coil end 30 is electrically connected to the control device by a three-phase cable including a U-phase cable, a V-phase cable, and a W-phase cable, and is mounted on a vehicle such as a hybrid vehicle. A torque command value to be output by the rotating electrical machine 1 is sent from an ECU (Electrical Control Unit). Then, the control device generates a motor control current for outputting the torque designated by the torque command value, and the motor control current is supplied to the coil end 30 via the three-phase cable.

  2A is a schematic diagram illustrating an example of the configuration of the stator, and FIG. 2B is an enlarged schematic diagram of the stator in a dotted frame X. FIG. As shown in FIG. 2A, the stator 12 includes a stator core 26 and a thin plate 32. The stator core 26 is a set of a plurality of divided cores 28 arranged adjacent to each other. The number of divided cores 28 is not particularly limited.

  As shown in FIG. 2A, the thin plate 32 is formed by rolling a strip-shaped thin plate material into a cylindrical shape and is mounted on the outer periphery of the divided core 28 constituting the stator core 26. As shown in FIG. 2 (B), one end A and the other end B in the circumferential direction of the thin plate 32 are welded to each other, and are also arranged at a welding point (dotted line frame C) between the one end A and the other end B. The split cores 28 are also welded simultaneously (specifically, the split cores 28 and the thin plates 32, the split cores 28 and the like are welded).

  As in the present embodiment, a belt-like thin plate material is rolled into a cylindrical shape, the thin plate 32 is attached to the outer periphery of the split core 28, and one end and the other end of the thin plate 32 are welded to each other, Also, by simultaneously welding the split cores 28 arranged at the welding locations, (1) the material yield can be greatly improved compared to the outer cylinder ring generally formed by deep drawing, (2) General split core fixing methods such as shrink fitting and press-fitting make it easier to design and control the tightening force against the variation in tightening allowance of the split core. (3) Along with welding between the ends of the thin plate, Because it is welded at the same time, the shape of the thin plate material is simple, and the material yield and press punching are good. (4) The split core is also welded at the same time as the welding between the ends of the thin plate, so the positioning accuracy of the split core is high. Improved and department It may be low in dimensional accuracy requirements, (5) the shape of the thin plate can be simplified, correspondence is facilitated of changes in the stator lamination thickness (variation difference).

  FIG. 3 is a partial schematic perspective view showing another example of the configuration of the stator of the present embodiment. The stator 12 shown in FIG. 3 includes a plurality of divided cores 28 arranged adjacent to each other, and a thin plate 32 that is formed by rolling a strip-shaped thin plate material into a cylindrical shape and is mounted on the outer periphery of the divided core 28. . In addition, a protrusion 34 disposed between one end A and the other end B in the circumferential direction of the thin plate is formed on the outer peripheral surface of at least one of the plurality of divided cores 28. The projection 34 is welded to one end A and the other end B in the circumferential direction of the thin plate (for example, a dotted line frame C in FIG. 3 is a welding location).

  In this way, by welding the protrusions formed on the outer peripheral surface of the split core and the end portions of the thin plate, it is possible to suppress an increase in iron loss due to welding (a hindrance to the flow of magnetic flux).

  The strip-shaped thin plate material used in the present embodiment may be divided into a plurality of portions in the circumferential direction or the axial direction, and a plurality of welding locations between the end portions may be set as the thin plate material is divided.

  DESCRIPTION OF SYMBOLS 1 Rotating electric machine, 10 Rotor, 12 Stator, 14 Rotor core, 16 Rotor shaft, 18 End plate, 20a Magnetic steel plate, 20b Magnetic steel plate, 26 Stator core, 28 Split core, 30 Coil end, 32 Thin plate, 34 Protrusion part.

Claims (1)

A stator comprising a plurality of split cores arranged adjacent to each other, and a thin plate mounted on the outer periphery of the split core, formed by rolling a strip-shaped thin plate material into a cylindrical shape,
One end and the other end of the thin plate in the circumferential direction are welded to each other, and a split core positioned at the welding location is also welded.

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