JP2011172335A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor having a stator formed by assembling a plurality of split cores annularly and shrink-fitting them by a cylindrical shrink fit ring with more proper fastening force without deforming or damaging the split cores. <P>SOLUTION: The split cores 42 are configured by laminating a plurality of end core members 44b each having a smaller periphery than that of body core members 44a, at the end of the laminate, thereby preventing the body core members 44a of the split core 42 located at the ends in contact with the shrink fit ring 50 from being deformed due to the fastening force from the shrink fit ring 50. The stator 40 is formed by shrink-fitting with proper fastening force without deforming or damaging the split cores 42. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly, to an electric motor having a stator in which a plurality of divided cores formed by laminating electromagnetic steel sheets are assembled in an annular shape and shrink-fitted with a cylindrical shrink-fitting ring.

  Conventionally, as this type of electric motor, a motor having a stator in which a divided core is assembled in an annular shape is baked with a shrink fitting ring having a plurality of through holes (see, for example, Patent Document 1). In this electric motor, a plurality of through-holes are provided in the shrink-fit ring so that the force for tightening the split core of the shrink-fit ring is appropriate.

JP 2008-86172 A

  In the above-described electric motor, a shrink-fit ring that is longer in the axial direction than the thickness of the split core may be used for fixing the motor or for more reliable fixing of the split core. At this time, the end of the split core may be deformed or damaged by the tightening force at the portion protruding beyond the thickness of the split core of the shrink-fit ring acting on the end of the split core. In order to prevent such deformation and breakage of the end of the split core, it is conceivable to reduce the tightening force of the shrink-fit ring. There are cases where the split core is displaced from the fixed position or the split core is detached from the shrink-fit ring.

  The electric motor of the present invention has a stator having a stator in which a plurality of split cores are assembled in an annular shape and shrink-fitted with a cylindrical shrink-fitting ring, and a more appropriate tightening force is obtained without causing deformation or breakage of the split cores. The main object is to provide a stator that is shrink-fitted with.

  The electric motor of the present invention employs the following means in order to achieve the main object described above.

The electric motor of the present invention is
An electric motor having a stator in which a plurality of divided cores made by laminating electromagnetic steel sheets are assembled in an annular shape and shrink-fitted with a cylindrical shrink-fitting ring,
The shrink fitting ring has an abutting portion that abuts on the plurality of divided cores and an extending portion that extends from the plurality of divided cores in the stacking direction of the divided cores,
The split core is a laminated body in which a plurality of core members for a main body formed by electromagnetic steel plates are laminated so that the outer periphery of a yoke part forming the outer periphery of the ring is the same as the outer periphery of the ring when assembled in an annular shape. The laminated end is configured by laminating at least one laminated end core member formed by a magnetic steel plate so that the outer periphery of the yoke portion does not contact the shrink fitting ring by a predetermined dimension. Become,
This is the gist.

  In the electric motor of the present invention, the split core that is shrink-fitted with the shrink-fitting ring is formed of an electromagnetic steel plate so that the outer periphery of the yoke part that forms the outer periphery of the ring is the same as the outer periphery of the ring when assembled in an annular shape. A laminated end core member formed at a laminated end of a laminated body in which a plurality of core members for the main body are laminated so that the outer periphery of the yoke portion is not contacted with the shrink-fit ring by a magnetic steel sheet by a predetermined dimension. At least one sheet is laminated. Of the core members constituting the split core, the core member at the end that comes into contact with the extended portion side of the shrink-fit ring is a core member for the body located at the laminated end of the laminate, and the shrink-fit ring is attached to the core member for the body. The tightening force due to the contraction of the extending portion of the body acts to deform the main body core member. However, since the force which suppresses a deformation | transformation acts from the core member for lamination | stacking ends laminated | stacked on the lamination | stacking end of a laminated body to the core member for main bodies, the core member for main bodies does not deform | transform. In the electric motor of the present invention, the core member for the main body at the end abutting against the shrink-fit ring is prevented by stacking the core member for the stacking end having a small outer periphery on the stacking end of the split cores constituting the stator. It is. Therefore, it is possible to provide a stator that is shrink-fitted with a more appropriate tightening force without causing deformation or breakage of the split core.

  In such an electric motor of the present invention, the shrink fitting ring may be formed by forming a flange at an end portion of the extending portion in the stacking direction of the split cores.

It is a block diagram which shows the outline of a structure of the electric motor 20 as one Example of this invention. It is an external appearance perspective view of the shrink-fit ring 50 which comprises the stator 40 in the electric motor 20 of an Example. It is sectional drawing which shows the cross section of the AA line of FIG. It is explanatory drawing which expands and schematically shows the site | part (FIG.4 (a)) near the flange 56 of FIG. 3, and the same site | part (FIG.4 (b)) of a comparative example. It is explanatory drawing explaining the mode of the division | segmentation core 242 of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an electric motor 20 as an embodiment of the present invention. FIG. 2 is an external perspective view of a shrink-fit ring 50 constituting a stator 40 in the electric motor 20 of the embodiment. 3 is a cross-sectional view showing a cross section taken along line AA of FIG. As illustrated, the electric motor 20 according to the embodiment includes a rotor 32 attached to the rotary shaft 22 and a stator 40 around which a coil (not shown) is wound.

  The rotor 32 is configured by laminating a plurality of rotor members formed by punching a non-oriented electrical steel sheet, and is attached to the rotary shaft 22 by shrink fitting or spline fitting. In the vicinity of the outer peripheral surface of the rotor 32, eight rectangular through holes are formed in the axial direction, and the direction of the magnetic poles is reversed so that the eight permanent magnets 34 face the lines of magnetic force in the radial direction and every other magnet. Is inserted.

  The stator 40 includes 24 divided cores 42 that form an annular shape when assembled, a shrink-fit ring 50 that shrink-fits the 24 divided cores 42 assembled in an annular shape, and a coil (not shown). Prepare. The split core 42 is formed by laminating a plurality of (for example, 100) main body core members 44a formed by punching a non-oriented electrical steel sheet, and the outer periphery of the non-oriented electrical steel sheet 44a is similarly punched. A plurality of (for example, several) laminated end core members 44b formed on the laminated ends of the main body core member 44a are laminated on the laminated end of the main body core member 44a. A yoke portion 45 having four caulking portions 45a for fixing the core member 44a for the main body and the core member 44b for the stacking end forming the outer peripheral portion and a slot for winding the coil is formed. Therefore, it has two teeth portions 46 protruding from the yoke portion 45 to the inner peripheral side. As shown in FIG. 2, the shrink-fit ring 50 has a cylindrical tubular shape having a flange 56 at one end made of steel so that the inner diameter at room temperature is slightly smaller than the outer periphery of the annular core when 24 divided cores 42 are assembled in an annular shape. And a mounting portion 58 with five holes attached to a flange 56 for attaching the main body 52 to the case. As shown in FIG. 3, the main body 52 includes a contact portion 53 that contacts the split core 42 and two extending portions 54 and 55 that protrude from the split core 42 in the stacking direction. A flange 56 is attached to the end of the side in the stacking direction. The stator 40 is assembled by assembling 24 divided cores 42 in an annular shape, shrink fitting ring 50 onto this, and winding a coil around the formed slot.

  FIG. 4 is an explanatory diagram schematically showing an enlarged view of the portion in the vicinity of the flange 56 in FIG. 3 (FIG. 4A) and the same portion in the comparative example (FIG. 4B). In the comparative example, a split core 142 obtained by stacking only the main body core member 44a is shrink-fitted with the same shrink-fitting ring 50 as in the example. As shown in FIG. 4B, in the comparative example in which the shrink-fitting ring 50 is shrink-fitted and returned to room temperature, the core member for the main body in the vicinity of the laminated end of the split core 142 that receives the tightening force due to contraction in the vicinity of the flange 56. 44a is deformed. On the other hand, in the embodiment, as shown in FIG. 4A, the laminated end core member 44b having a smaller outer periphery than the main body core member 44a is laminated on the laminated end of the split core 42 over several sheets. Since the laminated end core member 44b at the laminated end of the split core 42 does not contact the shrink-fit ring 50, the main body core member 44a located at the laminated end of the laminated body of the main body core member 44a and the vicinity thereof is provided. Similar to the comparative example, it tries to be deformed by receiving a tightening force due to contraction in the vicinity of the flange 56. However, in the embodiment, several core members 44b stacked at the stacking ends by caulking act on the core member 44a that is trying to deform the main body core member 44a to suppress the deformation. The deformation of the member 44a is suppressed, and the divided core 42 maintains the original shape. In the embodiment, the number of laminated end core members 44b (the number corresponding to the depth D1 in FIG. 4A) is sufficient to suppress deformation of the main body core member 44a due to shrink fitting. The shrink-fit ring 50 can be used within the usable temperature range of the electric motor 20 so that the outer periphery of the laminated end core member 44b is reduced (length L1 in FIG. 4A). Even if it expands and contracts, the shrink-fit ring 50 does not come into contact. Further, in the embodiment, several laminated end core members 44b are laminated on the laminated end of the split core 42 on which the flange 56 is not formed, and deformation of the main body core member 44a is suppressed. .

  According to the electric motor 20 of the embodiment described above, the divided core 42 is configured by stacking a plurality of laminated end core members 44b whose outer periphery is formed smaller than the main body core member 44a at the laminated end. The deformation due to the tightening force from the shrink-fit ring 50 of the main body core member 44a located at the end contacting the shrink-fit ring 50 can be suppressed. That is, the stator 40 can be formed by shrink fitting without causing deformation or breakage of the split core 42 and with a more appropriate tightening force.

  In the electric motor 20 of the embodiment, the split core 42 is formed by laminating a plurality of laminated end core members 44b on both laminated ends of the laminated body of the main body core members 44a. A plurality of laminated end members may be laminated on only one side of the core member 44a (for example, only on the flange 56 side). The number of laminated end core members 44b depends on the thickness of the laminated end core member 44b. It may be one.

  In the electric motor 20 of the embodiment, the split core 42 is formed by stacking a plurality of stacked end core members 44b on both stacked ends of the stacked body of the main body core members 44a. As shown in FIG. 5, a plurality of laminated end core members 244 b whose outer periphery gradually decreases from the main body core member 244 a may be laminated on the laminated end of the laminated body of the main body core members 244 a.

  In the electric motor 20 of the embodiment, the shrink-fit ring 50 is formed by attaching the flange 56 to the end portion in the stacking direction on the extending portion 54 side. However, the flange 56 may not be attached.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the split core 42 corresponds to a “split core”, the shrink-fit ring 50 corresponds to a “shrink-fit ring”, the main body core member 44 a corresponds to a “main body core member”, and the laminated end core. The member 44b corresponds to a “stacked end core member”. The flange 56 corresponds to a “flange”, the main body core member 244a also corresponds to a “main body core member”, and the laminated end core member 244b also corresponds to a “laminated end core member”.

  Here, the “divided core” is not limited to the divided core 42 divided in 24 in the circumferential direction, but is laminated on the laminated end of the laminated body in which electromagnetic steel sheets are laminated and a plurality of core members for the main body are laminated. As long as it is configured by laminating at least one end core member, it may be divided into several pieces in the circumferential direction. The “shrink-fit ring” is not limited to the shrink-fit ring 50 to which the flange 56 is attached. Any cylindrical shape having an extending portion extending from the core in the stacking direction of the divided cores may be used. The “main body core member” is not limited to the main body core member 44a and the main body core member 244a, and the outer periphery of the yoke portion that forms the outer peripheral portion of the ring when assembled in an annular shape is an annular shape. Any material may be used as long as it is formed of a magnetic steel sheet so as to be the same as the outer periphery. The “layered end core member” is not limited to the layered end core member 44b and the layered end core member 244b, and is used for the main body so that the outer periphery of the yoke portion is not in contact with the shrink-fit ring by the electromagnetic steel plate. Any material may be used as long as it is formed smaller than the core member by a predetermined dimension. In addition, the “flange” is not limited to the flange 56, and may be any one that is formed at the end portion in the stacking direction of the split cores in the extending portion, such as one that is not provided with the attachment portion 58. It doesn't matter what.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention is applicable to the motor manufacturing industry.

  20 Electric motor, 22 Rotating shaft, 32 Rotor, 34 Permanent magnet, 40 Stator, 42, 142, 242 Split core, 44a, 244a Core member for main body, 44b, 244b Core member for laminated end, 45 York portion, 45a Caulking portion, 46 teeth part, 50 shrink fitting ring, 52 main body, 53 contact part, 54,55 extension part, 56 flange, 58 attachment part.

Claims (2)

An electric motor having a stator in which a plurality of divided cores made by laminating electromagnetic steel sheets are assembled in an annular shape and shrink-fitted with a cylindrical shrink-fitting ring,
The shrink fitting ring has an abutting portion that abuts on the plurality of divided cores and an extending portion that extends from the plurality of divided cores in the stacking direction of the divided cores,
The split core is a laminated body in which a plurality of core members for a main body formed by electromagnetic steel plates are laminated so that the outer periphery of a yoke part forming the outer periphery of the ring is the same as the outer periphery of the ring when assembled in an annular shape. The laminated end is configured by laminating at least one laminated end core member formed by a magnetic steel plate so that the outer periphery of the yoke portion does not contact the shrink fitting ring by a predetermined dimension. Become,
Electric motor. The electric motor according to claim 1,
The shrink fitting ring is formed with a flange at an end portion in the stacking direction of the split cores in the extension portion.
Electric motor.

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