JP2011055657A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact rotary electric machine. <P>SOLUTION: The rotary electric machine includes a shaft 15, permanent magnets 16, 17 mounted on the shaft 15 and formed by arraying a plurality of magnetic poles on the outer peripheries in the peripheral direction, and a plurality of windings 20, 21, 22 disposed to face each other via the permanent magnets 16, 17 and air gaps. The windings 20, 21, 22 are constituted of a pair of axial extension parts 20a, 21a, 22a extending in the direction of the shaft, and a set of connection parts 20b, 21b, 22b connected to ends of the axial extension parts 20a, 21a, 22a. The connection parts 20b, 21b, 22b are disposed to face the shaft in the peripheral direction, and also partially overlap the connection parts of the adjacent windings in the radial direction. The radial dimension of an overlap part with at least one of the windings adjacent to the connection parts 20b, 21b, 22b is set smaller than those of the axial extension parts 20a, 21a, 22a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine that is a motor or a generator.

  Conventionally, in a rotating electrical machine, a motor including a rotor in which a permanent magnet is disposed inside a stator having windings is known (Patent Document 1).

  Such a motor is constituted by a so-called full-pitch winding in which the rotor-side magnetic pole pitch and the stator-side winding pitch are substantially equal, and the magnetic flux interlinked with the winding is maximized, so that a high torque can be obtained. It is like that.

JP 2003-88078 A

  However, in the motor of Patent Document 1, windings are applied across a plurality of magnetic pole teeth in slots between magnetic pole teeth, and adjacent phase windings are arranged so as to overlap a part of the applied windings in the radial direction. Has been placed. For this reason, there is a problem that the diameter of the motor is increased by the amount that the windings of each phase are arranged in the radial direction.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a rotating electrical machine that can be reduced in size by reducing the radial thickness of each phase winding.

  In order to achieve the above object, the present invention provides the following means.

  The present invention includes a shaft, a permanent magnet attached to the shaft and having a plurality of magnetic poles arranged in the circumferential direction on the outer periphery, and a plurality of windings disposed at positions facing the permanent magnet via an air gap. The winding is configured to induce a voltage having a phase different from that of the other windings, a pair of axially extending portions extending in the direction of the axis, and a circumferential direction with respect to the axis. It is composed of a pair of connecting portions arranged and connected to each of the end portions of the axially extending portion, and the connecting portion includes a connecting wire bundle composed of a wire bundle having the shortest length in the radial direction of the shaft. The connection electric wire bundle provides a rotating electrical machine in which the width of the connection electric wire bundle is set to be shorter than the width of the axially extending portion in the radial direction of the shaft.

  According to the present invention, since the radial dimension of the overlapping portion of adjacent windings is set to be smaller than that of the axially extending portion, the radial dimension of the stator can be reduced. Therefore, it is possible to reduce the size of the rotating electrical machine.

  In the said invention, a connection electric wire bundle is good also as being set so that the outer surface area of a connection electric wire bundle may become larger than the outer surface area of an axial direction extension part.

  According to such a configuration, since the surface area of the overlapping portion of the connecting portion with at least one adjacent winding is set to be larger than any surface area of the axially extending portion, The overlapping portion can increase the heat dissipation area of the winding that generates heat when energized.

  This rotating electrical machine is set so that the surface area of the overlapping portion of the windings of the connecting portion is increased, and the overlapping portion of the windings of the connecting portion is disposed in the circumferential direction so as to face the shaft. The temperature rise of the winding wire can be suppressed by the air flow accompanying the rotation of the wire. Therefore, the diameter of the electric wire can be reduced so that the current density of the electric wire is increased, and the radial dimension of the stator can be reduced. Therefore, it is possible to reduce the size of the rotating electrical machine.

  Moreover, in the said invention, it is good also as an axial direction extension part being set as the space | interval substantially equal to the width | variety of one magnetic pole of a permanent magnet.

  According to such a configuration, the magnet magnetic flux linked to the winding can be utilized to the maximum extent. Therefore, the winding resistance can be reduced and the efficiency of the rotating electrical machine can be improved. The connecting wire bundle may be set so that the number of wires in the connecting wire bundle is smaller than the number of wires in the axially extending portion in the radial direction of the shaft. The connecting wire bundle may be set so that the number of wires of the connecting wire bundle is one in the radial direction of the shaft.

  According to the present invention, it is possible to reduce the thickness of each phase winding in the radial direction and reduce the size.

It is a perspective view which shows the rotary electric machine which concerns on one Embodiment of this invention. It is a front view of the rotary electric machine of FIG. It is side surface sectional drawing of the rotary electric machine of FIG. It is the top view which expand | deployed the coil | winding in planar shape. It is a figure for demonstrating the surface area of a coil | winding.

  Hereinafter, a rotating electrical machine 1 according to an embodiment of the present invention will be described with reference to the drawings.

  The rotating electrical machine 1 according to the present embodiment is a three-phase rotating electrical machine having three windings. As shown in FIGS. 1, 2, and 3, the rotating electrical machine 1 is formed between a cylindrical iron core 10 having a tooth portion protruding inward and two adjacent tooth portions 12. The windings 20, 21, and 22 inserted in the slot 11, the wedge 3 that prevents the windings from falling into the inner side of the iron core, and the rotor 5 disposed inside the iron core 10 are provided.

  As shown in FIGS. 1, 2, and 3, the rotor 5 includes a cylindrical shaft 15 and two divided ring-shaped permanent magnets 16 and 17 attached to the outer peripheral surface of the shaft 15. The rotor 5 rotates, so that an induced electromotive force is generated in the winding. Here, instead of the permanent magnets 16, 17, a single ring-shaped permanent magnet in which a plurality of magnetic poles are arranged in the circumferential direction may be used.

  The permanent magnets 16 and 17 are attached to the outer periphery of the shaft so that the polarities of the magnets are opposite to each other. Therefore, the angle occupied by one magnetic pole is 180 °.

  The windings 20, 21 and 22 are applied (induced) with a voltage having a phase different from that of the other windings. The windings 20, 21, and 22 are composed of a pair of axially extending portions 20a, 21a, and 22a extending in the axial direction and a pair of connecting portions 20b, 21b, and 22b that connect the axially extending portions. Is done. The pair of axially extending portions 20a, 21a, and 22a extend in the axial direction with substantially the same length as that of the permanent magnets 16 and 17, and the pair of axially extending portions are positioned at diagonal positions of 180 °. It is inserted into the slot 11. The pair of connecting portions 20b, 21b, and 22b are connected to the respective ends of the pair of axially extending portions, and are disposed in the circumferential direction so as to face the shaft on the outer side in the axial direction of the permanent magnets 16 and 17. ing.

  Note that the windings 20, 21, and 22 are connected to terminals (not shown) at the ends.

  The windings 20, 21, and 22 will be described in detail below. As shown in FIG. 2, the windings 20, 21, and 22 include connecting wire bundles Sa, Sb, and Sc that are wire bundles having the shortest length in the radial width dA of the shaft 15. The connecting wire bundles Sa, Sb, Sc are set so that the width dA of the connecting wire bundles Sa, Sb, Sc is shorter than the width dB of the axially extending portions 20a, 21a, 22a in the radial direction of the shaft 15. ing. This point will be further described with reference to FIG.

  FIG. 4 is a plan view of the windings 20, 21, and 22 developed in a planar shape. When the windings 20, 21, and 22 are incorporated in the corresponding slots 11 and the like, the windings 20, 21, and 22 are bent in a predetermined direction. In the present embodiment, in order to facilitate the explanation of the present invention, FIG. 4 shows an unfolded state in which the windings 20, 21, and 22 are not bent.

  As shown in FIG. 4, in the present embodiment, the windings 20, 21, and 22 are wound around the electric wire 6 times. The connecting wire bundles Sa, Sb, and Sc exist at positions corresponding to overlapping portions of the connecting portions 20b, 21b, and 22b with adjacent windings. As shown in the cross section AA, the connecting wire bundles Sa, Sb, and Sc are arranged in one row in the radial direction and six rows in the axial direction, and the axially extending portions 20a, 21a, and 22a have the cross section BB. As shown in FIG. 3, the electric wires are arranged in three rows in the radial direction and two rows in the circumferential direction. In section AA, the electric wires are arranged in one row in the radial direction, and section BB is arranged in three rows. Therefore, section A-A has a smaller radial dimension than section BB. Yes. As a result, the connecting wire bundles Sa, Sb, Sc have a width dA of the connecting wire bundle Sa, Sb, Sc smaller than a width dB of the axially extending portions 20a, 21a, 22a in the radial direction of the shaft 15. Will be set to. The connecting wire bundles Sa, Sb, Sc are such that, in the radial direction of the shaft 15, the number of wires of the connecting wire bundle Sa, Sb, Sc is smaller than the number of wires of the axially extending portions 20a, 21a, 22a. It may be set.

  FIG. 5 shows a cross section AA at a position corresponding to an overlapping portion of the connecting portions 20b, 21b, and 22b of FIG. 4 with the adjacent windings, that is, a cross section of the connecting wire bundles Sa, Sb, and Sc, It is a figure for demonstrating the outer surface area of the coil | winding in the cross section BB of the part 20a, 21a, 22a. The outer surface area of the winding in the unit length in the longitudinal direction of the electric wire is the area obtained by multiplying the length of the contour connecting the contours of the electric wire cross section by the unit length in the longitudinal direction of the electric wire in both the sections AA and BB. Can be defined. If the wire diameter is d, the length of the contour connecting the contours of the cross section AA is 6πd, and the cross section BB is 4πd. Therefore, the outer surface area of the winding at the unit length in the longitudinal direction of the wire The cross section AA is larger than the cross section BB.

  Here, since a plurality of tooth portions 12 are provided, a slot 11 that is a gap is formed between them. Since each of the slots 11 is provided with the axially extending portions 20a, 21a, and 22a, the axial direction portions of the windings can be appropriately bundled using the empty space in the rotating electrical machine 1.

  On the other hand, end portions of the axially extending portions 20a, 21a, and 22a are portions protruding from the slots 11, and are portions to which the connecting portions 20b, 21b, and 22b are connected. Thereby, even if the axially extending portions 20a, 21a, and 22a are well accommodated in each of the slots 11, the end portions of the axially extending portions 20a, 21a, and 22a protruding from the respective slots 11 are Since it is connected to the connecting portions 20b, 21b, and 22b, it may protrude greatly in the radial direction of the shaft 15. Thereby, depending on the electric wire arrangement | sequence in axial direction extension part 20a, 21a, 22a and connection part 20b, 21b, 22b, the whole rotary electric machine 1 cannot be reduced in size.

  In the present embodiment, the connecting wire bundles Sa, Sb, and Sc having the shortest width in the radial direction of the connecting portions 20b, 21b, and 22b have the connecting wire bundles Sa, Sb, and Sc having an axially extending portion 20a. , 21a and 22a are set to be shorter than the width. As a result, the connecting portions 20b, 21b, and 22b can be prevented from projecting greatly in the radial direction of the shaft 15, and the axial direction portion of the winding can be appropriately set using the empty space in the rotating electrical machine 1. Since they can be bundled, the entire rotating electrical machine 1 can be reduced in size.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in the above-described embodiment, the winding inserted into the slot 11 of the cylindrical iron core 10 is described as an example. However, the winding may be inserted into a slotless annular yoke, or the yoke The winding may not be used. The windings 20, 21, and 22 are formed by winding the electric wire six times, and the overlapping portions of the connecting portions 20b, 21b, and 22b with the adjacent windings are arranged in one row in the radial direction and six rows in the axial direction. The axially extending portions 20a, 21a, and 22a are arranged in three rows in the radial direction and two rows in the circumferential direction, but the number of turns and the arrangement of the wires are not limited to this. .

  In addition, the holding means (not shown) which hold | maintains the state of connection part 20b, 21b, 22b (connection electric wire bundle Sa, Sb, Sc) may be provided. Examples of the holding means include a band and an accommodating portion that accommodates an electric wire bundle and is elastically deformable. Thereby, it is possible to prevent the wire bundles of the connecting portions 20b, 21b, and 22b (the connected wire bundles Sa, Sb, and Sc) from being deformed, and the rotating electrical machine 1 can be more reliably downsized.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 3 Wedge 5 Rotor 10 Iron core 15 Axis 16, 17 Permanent magnet 20, 21, 22, Winding 20a, 21a, 22a Axial extension part 20b, 21b, 22b Connection part

Claims (5)

A shaft, a permanent magnet that is attached to the shaft and has a plurality of magnetic poles arranged in the circumferential direction on the outer periphery, and a plurality of windings disposed at positions facing the permanent magnet via an air gap;
The winding is induced with a voltage having a phase different from that of the other windings, and is disposed in a circumferential direction with respect to the axis and a pair of axially extending portions extending in the direction of the axis. And a pair of connecting portions connected to the end portions of the axially extending portion,
The connecting portion includes a connecting wire bundle composed of a wire bundle having a shortest length in the radial direction of the shaft,
The connecting electric wire bundle is a rotating electrical machine in which the width of the connecting electric wire bundle is set to be shorter than the width of the axially extending portion in the radial direction of the shaft.   The rotating electrical machine according to claim 1, wherein the connecting wire bundle is set such that an outer surface area of the connecting wire bundle is larger than an outer surface area of the axially extending portion.   3. The rotating electrical machine according to claim 1, wherein the axially extending portion is set at an interval substantially equal to a width of one magnetic pole of the permanent magnet.   The rotating electrical machine according to claim 1, wherein the connecting wire bundle is set so that the number of wires of the connecting wire bundle is smaller than the number of wires of the axially extending portion in the radial direction of the shaft.   The rotating electrical machine according to claim 4, wherein the connecting wire bundle is set so that the number of wires of the connecting wire bundle is one in a radial direction of the shaft.

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