JP5809993B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine using a laminated core.

  Among the stator cores of rotating electrical machines, technical development is progressing mainly for the purpose of compact and high-power split cores with concentrated winding. However, when trying to obtain an output of about 300 kW used for an electric vehicle or the like, the diameter of the stator of the split core is about 250 mm. The divided cores are assembled into an annular shape, and a shrink fitting ring is fitted to fix the divided core assembly. This shrink fit ring has a diameter that can be shrink fit on the outer periphery of the split core assembly in which the split cores are assembled in an annular shape, and the dimensional accuracy thereof needs to be 1/10 to 1/100 mm.

  This shrink fitting needs to be fixed at such a pressure that the split core assembly and shrink fitting ring do not slip at the maximum output of the rotating electrical machine. In order to stably fix the split core assembly, it is only necessary to increase the shrinkage-tightening allowance and relax the tolerance of the required size of the shrink-fit ring.

  However, when the shrink-fit tightening margin is set large, the pressure for fixing the split core with the shrink-fit ring increases, and there is a possibility that the contact portion between the adjacent split cores buckles in the core stacking direction and deforms.

  As a solution to the deformation of the core, the points at both ends on the radially outer side of the core back are in a range sandwiched between two straight lines connecting the center point of the stator core and the points on both ends of the core back in the radial direction. There is a technique for forming the inner side or the outer side (see, for example, Patent Document 1).

  On the other hand, if the shrinkage tightening allowance is reduced, the force for fixing the split core assembly by the shrinkage fitting ring is reduced, and there is a risk that the torque slides in the circumferential direction or falls off in the axial direction due to impact. For this drop-off, there is a technique using the punching direction of the thin plate of the laminated core (see, for example, Patent Document 2).

JP 2009-44880 A JP 2010-28885 A

  The problem to be solved is that when the tolerance of the required size of the shrink-fit ring is relaxed, the split core is easily deformed by the pressure for fixing the split core with the shrink-fit ring.

  In order to solve the above problems, for example, a split core configured by laminating thin plates, a bobbin assembled, and a coil wound around the bobbin, and a split core assembly configured by assembling a plurality of split cores in an annular shape And a stator having a shrink-fit ring provided on the outer periphery in the radial direction of the split core assembly, the bobbin has a bobbin rod, and the radial width of the bobbin rod is the split core at the axial end surface of the split core. What is necessary is just to comprise a rotary electric machine so that the width | variety of the part which contacts the circumferential direction edge part of this may become larger than the width | variety of the part of the center part of a division | segmentation core circumferential direction.

  According to the present invention, it is possible to prevent the contact portion between adjacent split cores from buckling and deforming in the stacking direction due to the pressure for fixing the split core with the shrink-fit ring.

It is explanatory drawing of a stator core. It is explanatory drawing of a division | segmentation core. (Example 1) It is explanatory drawing of a division | segmentation core. (Example 2) It is explanatory drawing of a division | segmentation core. (Example 3)

  Embodiments of the present invention will be described below with reference to the drawings.

  In addition, in the following description, although demonstrated as a cylindrical shape, it is not restricted to a cylindrical shape, For example, a polygonal shape or a cup shape with a bottom may be sufficient. Further, the number of stacked layers and the number of divided cores illustrated below are examples, and may be other than the illustrated number of stacked layers and divided numbers.

[Example 1]
FIG. 1 is an exploded view of a stator core illustrating a configuration of a stator core used in a rotating electrical machine. The stator core includes a split core assembly 10 and a shrink-fit ring 20 that holds the split core assembly.

  The shrink-fit ring 20 has a function of holding the split core assembly 10 as described above, and the inner shape of the shrink-fit ring 20 can be a shape along the outer periphery of the split core assembly 10. Further, the inner diameter and the wall thickness of the shrink-fit ring 20 can be appropriately set in consideration of tensile stress and the like so that the split core assembly 10 can be fixed by shrink-fit or the like. A flange is provided at one end of the shrink-fit ring 20.

  The split core assembly 10 includes a plurality of split cores 30. When viewed in the axial direction (the direction along the rotating shaft of the rotating electrical machine), the outer circumferential shape in the radial direction is circular, the inner circumferential shape has an uneven shape set according to the stator specifications, and the number of protrusions is divided Corresponds to the number of core divisions. These protrusions are called teeth and the bobbin 40 is assembled and a coil (not shown) is wound.

  FIG. 2 shows the split core 30. The split core 30 is formed by punching a thin plate in a predetermined shape (for example, a silicon steel plate) in the axial direction so as to have a predetermined dimension, and press working can be used for punching. The split core 30 can be constituted by a tooth 32 that is a protrusion that can be assembled with the bobbin 40 and wound with a coil, and a core back 31 that contacts the adjacent split core and the shrink-fitting ring 20.

  The bobbin 40 can protrude in the axial direction from the axial end surface of the core back of the split core 30 so that the winding shape of the coil is not deformed when a coil (not shown) is wound around the teeth 32. The protruding portion of the bobbin 40 is called a bobbin ridge 41 or the like.

  The bobbin rod 41 can contact the axial end surface of the core back 31. Further, the bobbin rod 41 can also contact the circumferential end of the core back 31. Here, the circumferential direction end portion indicates approximately 1/4 with respect to the circumferential width of the core back.

  At this time, the radial width of the bobbin rod 41 is set so that the width of the bobbin rod 41 at the circumferential end is larger than the radial width at the center in the circumferential direction of the bobbin rod 41. The width of the bobbin rod 41 in the circumferential direction is preferably approximately 1/5 or more of the radial width of the core back 31.

[Example 2]
FIG. 3 shows another embodiment of the present invention. Configurations of parts not specifically described in the present embodiment are the same as those in the first embodiment.

  The radial width of the portion where the bobbin rod 41 contacts the axial end surface of the core back 31 and contacts the circumferential end of the core back 31 is approximately 1/5 or more of the radial width of the core back 31. Is desirable.

  However, the width of the end portion in the axial direction of the bobbin rod 41 need not be the same.

  Therefore, in this embodiment, the width of the bobbin rod 41 is reduced from the portion where the bobbin rod 41 contacts the end surface of the core back 31 toward the axial end of the bobbin rod 41. The specific shape for reducing the width of the bobbin rod 41 toward the end in the axial direction may be linear (inclination as shown in FIG. 3), stepwise (stepwise), or a combination of both.

Example 3
FIG. 4 shows another embodiment of the present invention. Configurations of parts not specifically described in the present embodiment are the same as those in the first embodiment.

  In the present embodiment, the reinforcing material 50 is incorporated in the bobbin rod 41 in the bobbin rod 41. Thereby, the strength of the bobbin rod 41 can be increased and the deformation of the core back 31 can be prevented.

  The reinforcing member 50 is made of a material that is stronger than the material of the bobbin 40, such as metal or resin.

10 Divided Core Assembly 20 Shrink Fit Ring 30 Divided Core 31 Core Back 32 Teeth 40 Bobbin 41 Bobbin Reed 50 Reinforcing Material

Claims (3)

A thin core is laminated, a bobbin is assembled, and a split core configured by winding a coil around the bobbin;
A split core assembly configured by annularly assembling a plurality of the split cores;
In a rotating electrical machine having a stator including a shrink-fit ring provided on a radially outer periphery of the split core assembly,
The bobbin has a bobbin spear;
The width in the radial direction of the bobbin rod is such that the width of the portion in contact with the circumferential end of the divided core is larger than the width of the central portion in the circumferential direction of the divided core on the axial end surface of the divided core. Rotating electric machine. A thin core is laminated, a bobbin is assembled, and a split core configured by winding a coil around the bobbin;
A split core assembly configured by annularly assembling a plurality of the split cores;
In a rotating electrical machine having a stator including a shrink-fit ring provided on a radially outer periphery of the split core assembly,
The bobbin has a bobbin spear;
The axial width end of the bobbin rod from the portion where the bobbin rod contacts the end surface of the core back of the divided core at the portion where the radial width of the bobbin rod contacts the circumferential end of the divided core. A rotating electric machine that becomes smaller with a step or inclination toward the part. A thin core is laminated, a bobbin is assembled, and a split core configured by winding a coil around the bobbin;
A split core assembly configured by annularly assembling a plurality of the split cores;
In a rotating electrical machine having a stator including a shrink-fit ring provided on a radially outer periphery of the split core assembly,
The bobbin has a bobbin rod that comes into contact with an axial end surface and a circumferential end of the core back of the split core ;
Metal or rotary electric machine which reinforcement is incorporated made of a material having strength than the material of the bobbin in the bobbin edge.