JP2013009561A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor without end plates by suppressing peeling of laminated core thin plates in a rotating electric machine.SOLUTION: Both-end projecting boards 36, 38 each having a projecting diameter larger than a diameter of a rotor core 30 and an inner diameter of a stator core 20 and comprising a magnetic material are installed at axial both ends of the rotor core 30 in a rotating electric machine 10, respectively. Out of the both-end projecting boards 36, 38, one side projecting board 36 includes a plurality of projecting portions, whereas the other side projecting board 38 is a disk. Each of the projecting portions is disposed in a projecting position corresponding to a slot arrangement pitch in the peripheral direction, has a projecting width smaller than an inner peripheral side opening width in the peripheral direction of an opening shape of a slot of a stator core 20 and an outer shape which can enter into the opening shape of the slot, and projects from the diameter of the rotor core 30.

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine including an end plateless rotor without an end plate.

  The rotating electrical machine is configured to include a stator and a rotor, and both the stator and the rotor are formed by stacking core thin plates such as electromagnetic steel plates to form a stator core and a rotor core, respectively. In this case, for the purpose of preventing the laminated core thin plates from being peeled off, reinforcing plates called end plates or end plates are provided on both ends of the laminate. In particular, since the rotor rotates, the core thin plate is easily peeled off. In the case of an embedded magnet type rotor, an end plate is used because it is necessary to hold the magnet.

  Patent Document 1 points out that there is a limit to the maximum number of rotations that can withstand centrifugal force as a magnetic steel sheet having a magnetic path divided by slits as a rotor of an electric motor. Therefore, it is disclosed that a nonmagnetic plate is sandwiched between electromagnetic steel plates, and in one of the embodiments, a nonmagnetic plate and an electromagnetic steel plate are bonded to each other, and an end plate is not used. The configuration is stated.

  In Patent Document 2, in a permanent magnet rotor that effectively utilizes reluctance torque in accordance with magnet torque, the core sheet is integrated as a laminated body in a region A surrounded by the outer edge of the permanent magnet and the outer circumference of the core sheet. It is stated that a hole for the caulking pin is provided. Then, it is stated that the reluctance torque can be effectively generated by shifting the hole not to the center of the region A but to the rear side in the rotation direction of the core sheet.

Japanese Patent Laid-Open No. 9-191618 JP-A-10-126986

  Providing the end plate increases the axial length of the rotating electrical machine. Therefore, an end plateless rotor without an end plate is considered.

  An object of the present invention is to provide a rotating electrical machine that enables an end plateless rotor by suppressing peeling of laminated core thin plates.

  A rotating electrical machine according to the present invention includes a stator having a stator core having a predetermined stator thickness, a plurality of core thin plates laminated in the axial direction, a rotor core having a laminated thickness larger than the stator thickness, and an axial direction of the rotor core. Both ends, each having an overhanging diameter larger than the rotor core diameter and larger than the inner diameter of the stator core and made of a magnetic material, and an end plate at the axial end of the rotor Is not provided.

  In the rotating electrical machine according to the present invention, the stator core has a plurality of slots arranged at a predetermined slot arrangement pitch along the circumferential direction, and the extension plate on at least one side of the both end extension plates It is arranged at a protruding position that matches the slot arrangement pitch in the direction, and has an overhang width that is smaller than the inner circumferential side opening width along the circumferential direction of the opening shape of the stator slot, and an outer shape that can enter the opening shape of the slot. However, it is preferable to have a plurality of protrusions protruding from the rotor core diameter.

  In the rotating electrical machine according to the present invention, it is preferable that the projecting plate on the other side of the both projecting plates is a disc having a diameter larger than the rotor core diameter.

  With the above configuration, the rotating electric machine is provided with both end projecting plates made of a magnetic material having a projecting diameter larger than the rotor core diameter and larger than the inner diameter of the stator core at both ends in the axial direction of the rotor core. Since the both-ends projecting plate which is a magnetic body projects on the stator core, an attractive force is generated between the stator core and the rotating electrical machine during operation. Thereby, even if there is no end plate, the core thin plate on which the rotor core is laminated can be pressed from both sides in the axial direction, and peeling due to repulsive force between the laminated core thin plates can be suppressed.

  In the rotating electrical machine according to the present invention, the extended plate on at least one side of the both-end extended plate has a plurality of protrusions in accordance with the slot arrangement pitch of the stator. Since the projecting diameter of the both end projecting plates is larger than the inner diameter of the stator core, if the both end projecting plates are discs, the rotor core to which the both end projecting plates are attached cannot pass through the inner diameter of the stator. Therefore, only the rotor core passes through the inner diameter of the stator core, and thereafter, both end projecting plates are attached to the rotor core. According to the above configuration, since the overhanging plate having the protruding portion that can pass through the slot of the stator is used, the assembly workability of the rotating electrical machine is improved.

  In the rotating electrical machine according to the present invention, the other extension plate of the both end extension plates is a disc having a diameter larger than the rotor core diameter. As described above, the projecting portion on one side has a protruding portion that can pass through the slot of the stator, and the projecting plate on the other side is a disk, so that the assembly workability of the rotating electrical machine is improved.

It is sectional drawing which shows the structure of the rotary electric machine of embodiment which concerns on this invention. It is a perspective view which shows the structure of the stator core of the rotary electric machine of embodiment which concerns on this invention, a rotor core, and a both-ends extension board. FIG. 3 is an exploded view of FIG. 2 and is a perspective view showing a portion of a stator core. FIG. 3 is an exploded view of FIG. 2, and is a perspective view showing portions of a rotor core and both-end projecting plates. It is a figure explaining the effect | action of a both-ends extension board in the rotary electric machine of embodiment which concerns on this invention. It is sectional drawing which shows the structure of the rotary electric machine of the prior art which uses an end plate for a comparison. It is a figure explaining peeling between the core thin plates of the rotor core which may arise when an end plate is abbreviate | omitted with the structure of FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Below, the core thin plate of the rotor core of a rotary electric machine and a stator core is demonstrated as an electromagnetic steel plate, However, Magnetic thin plates other than an electromagnetic steel plate may be sufficient. The stator core may not be a laminated type of electromagnetic steel sheets. For example, a molded core may be used. Further, an embedded magnet type in which a permanent magnet is embedded in a rotor core will be described as a rotor of a rotating electrical machine, but the arrangement of the permanent magnet may not be an embedded type. Moreover, the reluctance type | mold rotor which does not use a permanent magnet may be sufficient.

  The number of core thin plates, the number of both end projecting plates, the number of stator core slots, the number of projecting portions of the projecting plate, dimensions, material, shape, etc. described below are examples for explanation, and specifications of the rotating electrical machine It can be changed as appropriate according to the above.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating the structure of the rotating electrical machine 10. The rotating electrical machine 10 includes a motor case 14, a stator, and a rotor. In FIG. 1, the stator is divided into the stator core 20 and the coil end 24, and the rotor is divided into the rotor shaft 12, the rotor core 30 in which the permanent magnet 34 is embedded, and both end projecting plates 36 and 38. Yes.

  The stator fixed to the motor case 14 includes a stator core 20 in which a plurality of electromagnetic steel plates 22 are laminated, and a coil wound around the stator core 20. FIG. 1 shows a coil end 24 in which the coil protrudes from both end faces of the stator core 20. The lamination of the electromagnetic steel plates 22 is fixed in close contact with each other by appropriate caulking.

  The rotor shaft 12 is a shaft to which a rotor is attached and takes out rotational torque generated by the cooperation of the stator and the rotor, and corresponds to the output shaft of the rotating electrical machine 10. The rotor shaft 12 is rotatably supported by the motor case 14 by an appropriate bearing mechanism (not shown).

  The rotor core 30 is configured by laminating a plurality of electromagnetic steel plates 32 as core thin plates. As the electromagnetic steel plate 32, one punched from the same raw material thin plate as that of the electromagnetic steel plate 22 constituting the stator core 20 is used. That is, each electromagnetic steel plate 32 of the rotor core 30 is the same material and the same thickness as the electromagnetic steel plate 22 of the stator core 20. As in the case of the stator core 20, the lamination of the electromagnetic steel plates 32 is also fixed in close contact with each other by appropriate caulking. The rotor core 30 is provided with a magnet insertion hole along the axial direction, and a permanent magnet 34 is embedded in the magnet insertion hole. The permanent magnet is a magnet that forms a rotor magnetic pole.

  The rotor core 30 is obtained by laminating electromagnetic steel plates 32 that are thin core plates in the axial direction, and the laminating thickness thereof is larger than the laminating thickness of the stator core 20. This is because the both-end protruding plates 36 and 38 described below are provided at both ends in the axial direction of the rotor core 30, so that the both-end protruding plates 36 and 38 do not contact the axial end of the stator core 20 when the rotor rotates. It is for doing so. In FIG. 1, the thickness of one of the electromagnetic steel plates 32 of the rotor core 30 is made thicker than the laminated thickness of the stator core 20. Of course, it is assumed that there is a difference in thickness of several sheets instead of one. Good.

  The both-ends projecting plates 36 and 38 are magnetic plates provided in the rotor of the rotating electrical machine 10 to suppress peeling between the electromagnetic steel plates 32 of the rotor core 30 without using an end plate. The both-end projecting plates 36 and 38 are provided at both ends in the axial direction of the rotor core 30 and have a projecting diameter larger than the diameter of the rotor core 30 and larger than the inner diameter of the stator core 20. In FIG. 1, the upper side of the both ends projecting plates 36, 38 is distinguished as the one side projecting plate 36 and the lower side is illustrated as the other side projecting plate 38. Therefore, in the following, when it is necessary to distinguish the both-end projecting plates 36, 38, they will be referred to as the one-side projecting plate 36 and the other-side projecting plate 38, respectively.

  Both the one side projecting plate 36 and the other side projecting plate 38 can be made by punching an electromagnetic steel plate having the same thickness as the electromagnetic steel plate 32 of the rotor core 30 into a predetermined shape. The one side overhanging plate 36 and the other side overhanging plate 38 can be made of one electromagnetic steel plate, or a plurality of electromagnetic steel plates can be laminated. The rotor core 30 and the one side protruding plate 36, and the rotor core 30 and the other side protruding plate 38 are fixed in close contact with each other by appropriate caulking. Similarly, when the one side projecting plate 36 and the other side projecting plate 38 are formed by laminating a plurality of electromagnetic steel plates, they are fixed in close contact with each other by appropriate caulking. It is good also as what adheres and fixes using suitable adhesives other than caulking.

Both-end projecting plates 36 and 38 can be circular discs with a circular outer shape. In that case, if both end projecting plates 36 and 38 are provided at both axial ends of the rotor core 30, the outer diameter thereof becomes larger than the inner diameter of the stator core 20. Therefore, when the rotating electrical machine 10 is assembled, the inner diameter of the stator core 20 is passed only by the rotor core 30, and then the one side projecting plate 36 and the other side projecting plate 38 are attached to both ends of the rotor core 30 in the axial direction. On the other hand, if the shape of the projecting plate on at least one side of the both end projecting plates 36 and 38 is not a circular plate, but has an outer shape that can be inserted into the opening shape of the slot of the stator core, both ends of the rotor core 30 are disposed on the both ends. After the overhang plates 36 and 38 are assembled, the assembly can be passed through the inner diameter of the stator core 20.

  FIG. 2 is a diagram showing a configuration in which the other side overhang plate 38 is a disc, and the one side overhang plate 36 is not a disc but a overhang plate having a plurality of projecting portions 44. Each protrusion 44 has an outer shape that can enter the opening shape of the slot 42 defined by the adjacent teeth 40 in the stator core 20. The teeth 40 are protruding portions in the stator core 20 where the coil windings are wound, and the slots 42 are open spaces in which the coil windings are accommodated.

  The projecting portion 44 of the one side projecting plate 36 is disposed at a projecting position in accordance with the slot arrangement pitch in the circumferential direction, and is smaller than the inner circumferential side opening width along the circumferential direction of the opening shape of the slot 42 of the stator core 20. The protruding width and the outer diameter are smaller than the inner diameter dimension of the opening shape of the slot 42. This outer diameter is the same as the diameter of the other side protruding plate 38. But you may make the diameter of the other side extension plate 38 larger than the outer diameter of the protrusion part 44 of the one side extension plate 36. FIG.

  FIG. 3 is a perspective view of the stator core 20 when FIG. 2 is disassembled. FIG. 4 is a perspective view of a state in which one side projecting plate 36 and the other side projecting plate 38 are attached to the rotor core 30 when FIG. 2 is disassembled. In FIG. 3, the stator core 20 has 16 teeth 40 and 16 slots 42. Corresponding to this, FIG. 4 shows a state in which the one side projecting plate 36 has 16 protrusions 44.

  On the other hand, the protruding portion 44 of the side projecting plate 36 has a shape set in consideration of the assemblability of the rotating electrical machine 10, and can take various shapes according to the shape of the slot 42. In FIG. 3, the slot 42 is configured by three linear portions. However, when the shape of the slot 42 is configured by a curved portion, the shape of the protruding portion 44 can be set in a curved shape that can enter the curved portion. it can. 2 to 4, the number of the protrusions 44 is the same as the number of the slots 42, but the number of the protrusions 44 is smaller than the number of the slots 42 so that the arrangement is adapted to the arrangement pitch of the slots 42. It may be a number. For example, in the above example, the number of the protrusions 44 may be 8 or 12.

  In the above description, the other side overhanging plate 38 is described as a circular plate, but, of course, the other side overhanging plate 38 may be a overhanging plate having a protruding portion in the same manner as the one side overhanging plate 36.

  The operation of the rotating electrical machine 10 having the above configuration will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view of the inner diameter side of the stator core 20 and the outer diameter side of the rotor core 30. Here, the thickness of one electromagnetic steel plate 22 constituting the stator core 20 and the thickness of one electromagnetic steel plate 32 constituting the rotor core 30 are the same. Then, the rotor core 30 protrudes in the axial direction by the thickness of one electromagnetic steel plate 32 with respect to the axial end portion of the stator core 20. The other side protruding plate 38 is shown as a laminate of two electromagnetic steel plates having the same thickness as the electromagnetic steel plates 22 and 32.

  FIG. 5 shows a case where one tooth 40 of the stator core 20 is excited to the S pole by the winding coil (not shown) and the rotor core 30 is the N pole as the rotating electrical machine 10. Each of the electromagnetic steel plates 32 constituting the rotor core 30 is a core thin plate whose surface is insulated to suppress eddy currents. However, mutual magnetic flux flows in each electromagnetic steel plate 32 from the stator core 20 in the same direction. Repulsion works. FIG. 5 shows that this mutual repulsion works when each electromagnetic steel sheet 32 becomes an N pole.

  The repulsive forces that repel each other are generated between the adjacent electromagnetic steel plates 32 in any part of the rotor core 30, but the repulsive force is not peeled outward because there is no electromagnetic steel plate 32 outside the outermost portion. Work as a force. Here, since the other side projecting plate 38 of the electromagnetic steel plate is disposed at the outermost end of the rotor core 30, the surface of the other side projecting plate 38 facing the axial end of the stator core 20 is the N pole. . Accordingly, an attractive force acts between the N pole other side protruding plate 38 and the S pole stator core 20. In FIG. 5, this suction force is indicated by a white arrow.

  The suction force is such that the other side projecting plate 38 has a projecting diameter larger than the diameter of the rotor core 30 and larger than the inner diameter of the stator core 20 so as to cover the axial end of the stator core 20. It occurs in. The magnitude of this attractive force is not related to the size of the gap gap that is the difference between the inner diameter of the stator core 20 and the diameter of the rotor core 30.

  This suction force is also generated between the one side projecting plate 36 and the axial end portion of the stator core 20 facing the one side projecting plate 36. Therefore, the rotor core 30 receives pressing forces in directions opposite to each other by the one side protruding plate 36 and the other side protruding plate 38 at both ends in the axial direction. Thereby, even if there is no end plate, the axial peeling of the electromagnetic steel sheet 32 at the axial end of the rotor core 30 can be suppressed. In addition, even if the other side overhanging plate 38 is constituted by a plurality of electromagnetic steel plates, as shown in FIG. 5, each of the electromagnetic steel plates constituting the other side overhanging plate 38 is composed of N pole and S in one sheet. Since it has a pole, the electrical steel sheet in the axial direction end part does not peel in the axial direction outside. The same applies to the one side overhang plate 36.

  FIG. 6 and FIG. 7 are diagrams showing the configuration of a conventional rotating electrical machine 11 that uses an end plate 50 for comparison. 6 corresponds to FIG. 1, and FIG. 7 corresponds to FIG. In the rotating electrical machine 11, end plates 50 are respectively provided at the axial ends of the rotor core 31, and the axial length of the rotor including the end plates 50 is the same as the axial length of the stator core 20.

  If the end plate 50 is omitted in this configuration, the axial length of the rotor core 31 is shorter than the axial length of the stator core 20. The state of the end in that case is as shown in FIG. That is, the end of the rotor core 31 is at a position that is lowered by ΔS from the end of the stator core 20. As a result, in addition to the peeling force 43, the electromagnetic steel sheet 39 at the extreme end of the rotor core 31 has a force that is pulled upward by the attractive force 51 from the stator core 20, and the peeling is more likely to occur. Therefore, in the conventional rotating electrical machine 11, the end plate 50 cannot be omitted.

  The rotating electrical machine according to the present invention can be used as a rotating electrical machine having a rotor core on which core thin plates are laminated.

  10, 11 Rotating electric machine, 12 Rotor shaft, 14 Motor case, 20 Stator core, 22, 32 Magnetic steel sheet, 24 Coil end, 30, 31 Rotor core, 34 Permanent magnet, 36, 38 Both side extended plate, 39 (at the end ) Electrical steel sheet, 40 teeth, 42 slots, 43 peel force, 44 protrusion, 50 end plate, 51 suction force.

Claims (3)

A stator having a stator core of a predetermined stator thickness;
A plurality of core thin plates are laminated in the axial direction, and the laminated core is thicker than the stator thickness,
Both end projecting plates each provided at both axial ends of the rotor core, having a projecting diameter larger than the rotor core diameter and larger than the inner diameter of the stator core, and made of a magnetic material;
And an end plate is not provided at the axial end of the rotor. In the rotating electrical machine according to claim 1,
The stator core has a plurality of slots arranged at a predetermined slot arrangement pitch along the circumferential direction,
The overhanging plate on at least one side of the both end overhanging plate is
It is arranged at the projecting position according to the slot arrangement pitch in the circumferential direction, and has an overhang width smaller than the inner circumferential side opening width along the circumferential direction of the opening shape of the stator slot, and an outer shape that can enter the opening shape of the slot. A rotating electrical machine having a plurality of protrusions extending from a rotor core diameter. The rotating electrical machine according to claim 2,
The rotating electrical machine according to claim 1, wherein the projecting plate on the other side of the projecting plates on both ends is a disc having a diameter larger than the diameter of the rotor core.

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