JP2017051030A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switched reluctance motor/generator in which vibration and noise are reduced and which can be easily manufactured without considerably reducing efficiency.SOLUTION: Magnetic substance plate blocks 120a-120l which are disposed at intervals in a circumferential direction are defined as salient poles of a rotor 100. Cores of a stator 200 consist of: upper teeth (212u1, 212u4) including pole faces (215u1 and 215u4) which are disposed while being spaced apart from end faces (121a and 121g) of the magnetic substance plate blocks 120a-120l; lower teeth (212u7 and 212u8) including pole faces (215u7 and 215u8) which are disposed while being spaced apart from end faces (122a and 122g) of the magnetic substance plate blocks 120a-120l; and an upper yoke 211 and a lower yoke 221 disposed on end faces (214u1 and 214u4) of the upper teeth and end faces (214u7 and 214u8) of the lower teeth.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine, and more particularly to a switched reluctance motor and a switched reluctance generator.

  Generally, a switched reluctance motor does not use a magnet for a rotor (rotor). Therefore, such a switched reluctance motor does not require a rare earth which is expensive. From such a viewpoint, in recent years, a switched reluctance motor has attracted attention.

  In a switched reluctance motor, a rotor and a stator are arranged so that a salient pole of the rotor and a stator (stator) face each other, and excitation currents that flow through a plurality of excitation coils wound around the stator are sequentially switched. A magnetic attraction force in the rotational direction (circumferential direction) is generated in the rotor, and the rotor is rotated.

As described in Patent Document 1, a conventional switched reluctance motor is generally configured as follows.
The stator includes a yoke extending in the circumferential direction, and a plurality of teeth extending in the rotation axis direction from the inner circumferential side end portion of the yoke and arranged at intervals in the circumferential direction. An excitation coil is wound around each of the plurality of teeth.
Further, the rotor has a plurality of salient poles arranged at intervals in the circumferential direction, and the tip surfaces of the salient poles are opposed to each other with a gap between the tip surfaces of the stator teeth. It attaches to a rotating shaft so that it may become.

A magnetic attractive force acts between the teeth and the salient poles of the rotor by causing an exciting current to flow through the exciting coils wound around the teeth. As described above, by sequentially switching the excitation current flowing through the excitation coil wound around the plurality of teeth, a magnetic attractive force in the rotation direction (circumferential direction) is generated in the rotor, and the rotor is rotated.
It should be noted that a switched reluctance generator can be formed by using a configuration similar to such a switched reluctance motor.

Further, in general rotating electric machines including a switched reluctance motor and a switched reluctance generator, a tooth portion and a yoke portion of a stator are integrated. For this reason, the winding operation of the exciting coil around the teeth portion is not easy.
Therefore, Patent Document 2 proposes a rotating electrical machine including a stator in which a yoke part and a tooth part are separated. Specifically, in Patent Document 2, the stator core has a hollow cylindrical portion, a teeth portion, and a yoke portion. The hollow cylindrical portion has a cylindrical inner surface that surrounds the rotor with a gap interposed therebetween. The teeth portion has a plurality of radial portions extending outward from the hollow cylindrical portion in different directions along the radial direction of the hollow cylindrical portion. The yoke portion is formed by winding a soft magnetic steel strip so as to have a substantially cylindrical shape surrounding the teeth portion, and is in contact with the outer end surfaces of the plurality of radial portions of the teeth portion on the inner side surface. Composed.

JP 2012-114975 A JP 2013-240249 A

However, the switched reluctance motor described in Patent Document 1 has a problem that vibration and noise are large because the radial magnetic attractive force between the rotor and the stator moves (rotates) in the circumferential direction. .
Moreover, in the technique described in Patent Document 2, since the magnetic flux from the tooth portion enters perpendicularly to the plate surface of the soft magnetic steel strip constituting the yoke portion, eddy current is generated in the plate surface of the soft magnetic steel strip. Occur. Therefore, the efficiency of the rotating electrical machine may be greatly reduced.

  The present invention has been made in view of such problems, and provides a switched reluctance motor and a switched reluctance generator that can be easily manufactured without greatly reducing efficiency while reducing vibration and noise. For the purpose.

  A rotating electrical machine of the present invention is a rotating electrical machine that is a switched reluctance motor or a switched reluctance generator, and includes a rotor and a stator, and the rotor has an interval in a circumferential direction of the rotating electrical machine. A plurality of magnetic plate blocks arranged, each of which has a plurality of magnetic plate blocks stacked in a plurality of stages in the circumferential direction, and the stator is a rotating shaft of the rotor Two yoke portions disposed at positions facing each other with a gap therebetween in the direction parallel to the rotor, each wound so as to be coaxial with the rotation axis of the rotor Of the two yoke parts having a magnetic plate and the end face of the yoke part in a direction parallel to the rotation axis of the rotor, the end face closer to the rotor, A plurality of teeth portions arranged at intervals in a direction, each having a plurality of teeth plates stacked in a plurality of stages in the circumferential direction, and rotation of the rotor Accordingly, of the end faces of the teeth portion in the direction parallel to the rotation axis of the rotor, the end face closer to the rotor and the end face of the magnetic plate block in the direction parallel to the rotation axis of the rotor. The end face closer to the stator is opposed to the stator with a gap in a direction parallel to the rotation axis of the rotor.

  According to the present invention, it is possible to provide a switched reluctance motor and a switched reluctance generator that can be easily manufactured without greatly reducing efficiency while reducing vibration and noise.

It is a figure which shows an example of a switched reluctance motor longitudinal section. It is a figure which shows the cross section at the time of cutting the switched reluctance motor shown in FIG. 1 by the II part shown in FIG. It is a figure which shows the cross section at the time of cutting the switched reluctance motor shown in FIG. 1 in the II-II part shown in FIG. It is a figure which shows the cross section at the time of cutting the switched reluctance motor shown in FIG. 1 in the III-III part shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, for the convenience of explanation and notation, only parts necessary for explanation are simplified and shown as necessary. The X, Y, and Z coordinates shown in each figure indicate the relationship of directions in each figure, and the origin of the X, Y, and Z coordinates is common to each figure and is limited to the position shown in each figure. Not. In the present embodiment, a case where the rotating electrical machine is a switched reluctance motor will be described as an example.

  1-4 is a figure which shows an example of a structure of a switched reluctance motor. Specifically, FIG. 1 is a diagram (longitudinal sectional view) showing an example of a cross section when the switched reluctance motor is cut along the rotational axis and along the rotational axis. 2 is a diagram (II cross-sectional view) showing a cross section when the switched reluctance motor shown in FIG. 1 is cut at a portion II shown in FIG. FIG. 3 is a diagram (II-II sectional view) showing a section when the switched reluctance motor is cut at a portion II-II shown in FIG. 1 in FIG. FIG. 4 is a diagram (III-III cross-sectional view) showing a cross section when the switched reluctance motor is cut along a line III-III shown in FIG. 1 in FIG.

In FIG. 1, the switched reluctance motor includes a rotor (rotor) 100, a stator (stator) 200, and a rotating shaft 300.
An example of the configuration of the rotor 100 will be described with reference to FIGS. 1 and 2.

  The rotor 100 includes a rotating shaft mounting member 110, magnetic plate blocks 120a to 120l, magnetic plate block reinforcing members 130a to 130l, and a magnetic plate block outer periphery reinforcing member 140. Note that the rotor 100 of this embodiment does not include a magnet. However, the rotor may include a magnet (permanent magnet). Note that a switched reluctance motor having a rotor with a magnet is a known technique.

The rotating shaft mounting member 110 is a structural material made of a nonmagnetic material, and is connected (fixed) to the rotating shaft 300.
As shown in FIGS. 1 and 2, the rotating shaft mounting member 110 has an inner peripheral portion 111, an intermediate portion 112, and an outer peripheral portion 113. The inner peripheral part 111, the intermediate part 112, and the outer peripheral part 113 are integrated.

  The inner peripheral portion 111 is a portion in contact with the outer peripheral surface of the rotating shaft 300. A through hole having an inner peripheral surface of the inner peripheral portion 111 as an edge is formed in the central portion of the rotating shaft mounting member 110. The through hole has a size corresponding to the rotation shaft 300. The length of the inner peripheral portion 111 in the direction parallel to the rotation shaft 300 (Z-axis direction) is longer than that of the intermediate portion 112 and the outer peripheral portion 113. Further, the length of the inner peripheral portion 111 in the radial direction (Y-axis direction and the like) of the switched reluctance motor is shorter than that of the intermediate portion 112 and the outer peripheral portion 113. In the following description, the radial direction of the switched reluctance motor is abbreviated as the radial direction as necessary.

  The outer peripheral portion 113 is a portion in contact with the inner peripheral surfaces of magnetic plate blocks 120a to 120l and magnetic plate block reinforcing members 130a to 130l, which will be described later (see particularly FIG. 2). The length of the outer peripheral portion 113 in the direction parallel to the rotation axis 300 (Z-axis direction) is shorter than the inner peripheral portion 111 and longer than the intermediate portion 112, and is substantially the same as the magnetic plate blocks 120a to 120l. Further, the length of the outer peripheral portion 113 in the radial direction (such as the Y-axis direction) is longer than the inner peripheral portion 111 and shorter than the intermediate portion 112.

  The intermediate portion 112 is a portion where the inner peripheral end is connected to the outer peripheral end portion of the inner peripheral portion 111 and the outer peripheral end is connected to the inner peripheral end portion of the outer peripheral portion 113. The length of the intermediate portion 112 in the direction parallel to the rotation shaft 300 (Z-axis direction) is shorter than the inner peripheral portion 111 and the outer peripheral portion 113. Further, the length of the intermediate portion 112 in the radial direction (Y-axis direction and the like) is longer than the inner peripheral portion 111 and the outer peripheral portion 113.

  As shown in FIG. 2, a plurality of through holes 112 a to 112 l are formed in a region on the outer peripheral side of the intermediate portion 112 in a state of being spaced apart from each other along the circumferential direction of the switched reluctance motor. The plurality of through holes 112a to 112l are mainly for reducing the weight of the switched reluctance motor (rotor 100). In the following description, the circumferential direction of the switched reluctance motor is abbreviated as the circumferential direction as necessary.

  The rotating shaft mounting member 110 in which the inner peripheral portion 111, the intermediate portion 112, and the outer peripheral portion 113 are integrally formed is formed using, for example, aluminum alloy or engineering plastic from the viewpoint of ensuring rigidity. It is preferable to do so. However, as described above, if non-magnetic materials are used, it is not always necessary to use these materials. Further, for example, the rotary shaft attachment member 110 may be formed in a spoke shape to reduce the weight of the switched reluctance motor (rotor).

  The magnetic plate blocks 120a to 120l are the same. Each of the magnetic plate blocks 120a to 120l is formed by stacking and fixing a plurality of magnetic plates having the same shape and size while being electrically insulated from each other. Thereby, the layers of the plurality of magnetic plates are insulated. In the present embodiment, a case where a grain-oriented electrical steel sheet is used as a magnetic plate will be described as an example.

As the grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel sheet having a glass coating or a grain-oriented electrical steel sheet having an adhesive coating can be used. From the viewpoint of suppressing iron loss, the directional electromagnetic steel sheet is preferably thin, but a directional electromagnetic steel sheet (so-called thick material) having a large thickness may be used.
When the directional electromagnetic steel sheet is cut into a rectangular shape in accordance with the size of the magnetic material plate blocks 120a to 120l, the easy magnetization axis of the directional electromagnetic steel sheet is set in a direction parallel to a specific side of the rectangle. . In addition, the shape which cuts out a grain-oriented electrical steel sheet is not limited to a rectangular shape, For example, a square may be sufficient.

  Then, the plurality of rectangular directional electromagnetic steel sheets cut out in this way are stacked so that the easy magnetization axes in the directional electromagnetic steel sheets are in the same direction. At this time, among the directional electromagnetic steel sheets, two directional electromagnetic steel sheets adjacent to each other are insulated. Further, the plurality of grain-oriented electrical steel sheets are fixed by using, for example, an adhesive or the above-described adhesive coating.

  The magnetic plate blocks 120a to 120l configured as described above are spaced apart in the circumferential direction so that the direction of the easy magnetization axis in the grain-oriented electrical steel sheet is a direction parallel to the rotation axis 300 (Z-axis direction). It is arranged in a state having FIG. 2 shows an example in which the magnetic plate blocks 120a to 120l are arranged at equal intervals in the circumferential direction. At this time, the positions of the magnetic plate blocks 120a to 120l in the direction parallel to the rotation shaft 300 (Z-axis direction) are made the same. Further, the inner peripheral surfaces of the magnetic plate blocks 120a to 120l are fixed to the outer peripheral surface of the rotating shaft mounting member 110 (the outer peripheral portion 113).

In the present embodiment, the magnetic material plate blocks 120a to 120l arranged in this manner are arranged in a direction parallel to the rotary shaft 300 (Z) with a space in the circumferential direction at a portion close to the outer peripheral edge of the rotor 100. Axial magnetic salient poles can be provided.
Further, as shown in FIGS. 1 and 2, in this embodiment, no yoke (back yoke) is provided for the magnetic plate blocks 120a to 120l. Therefore, it is possible to reduce the usage amount of the magnetic material plate (orientated electromagnetic steel plate), and to realize weight reduction of the switched reluctance motor (rotor 100) and suppression of inertial force.

  The magnetic plate block reinforcing members 130a to 130l are disposed between two adjacent magnetic plate blocks that are spaced apart from each other in the circumferential direction. At this time, the circumferential end surfaces of the magnetic plate block reinforcing members 130a to 130l and the circumferential end surfaces of the magnetic plate blocks sandwiching the magnetic plate block reinforcing members are fixed to each other. Thereby, it can suppress that the magnetic body board block 120a-120l receives the stress of the circumferential direction, and deform | transforms and moves. Further, the inner peripheral surfaces of the magnetic plate inter-block reinforcing members 130a to 130l are fixed to the outer peripheral surface of the rotating shaft mounting member 110 (the outer peripheral portion 113).

  The magnetic plate block reinforcing members 130a to 130l are formed of a nonmagnetic and nonconductive material. From the viewpoint of securing rigidity, the magnetic plate inter-block reinforcing members 130a to 130l are preferably formed using, for example, engineering plastics. However, if a nonmagnetic and nonconductive material is used, it is not always necessary to use these materials. By using the non-conductive material for the reinforcing members 130a to 130l between the magnetic plate blocks, it is possible to suppress the formation of eddy currents, in particular, current paths that surround the magnetic plate blocks 120a to 120l. it can.

  The magnetic plate block outer periphery reinforcing member 140 is a thin ring-shaped member. The inner diameter of the magnetic plate block outer periphery reinforcing member 140 is the same as the length in the radial direction from the rotary shaft 300 to the outer peripheral surfaces of the magnetic plate blocks 120a to 120l and the magnetic plate interblock reinforcing members 130a to 130l, or the length It has a slightly longer length. The length of the magnetic plate block outer circumferential reinforcing member 140 in the direction parallel to the rotation axis 300 (Z-axis direction) is substantially the same as that of the magnetic plate blocks 120a to 120l.

  The magnetic plate block outer circumferential reinforcing member 140 is attached to the outer peripheral surfaces of the magnetic plate blocks 120a to 120l and the magnetic plate block reinforcing members 130a to 130l. At this time, the inner peripheral surface of the magnetic plate block outer periphery reinforcing member 140 is fixed to the outer peripheral surfaces of the magnetic plate blocks 120a to 120l and the magnetic plate block reinforcing members 130a to 130l. Thereby, it is possible to prevent the magnetic plate blocks 120a to 120l and the magnetic plate block reinforcing members 130a to 130l from being scattered by the centrifugal force generated by the rotation of the switched reluctance motor (rotor 100).

  The magnetic plate block reinforcing members 130a to 130l are arranged between the magnetic plate block outer periphery reinforcing member 140 and the outer peripheral portion 113 of the rotating shaft mounting member 110 between the magnetic plate block blocks 120a to 120l. You may mold so that a space may be filled.

  The magnetic plate block outer periphery reinforcing member 140 is made of a high-strength material that is nonmagnetic and has high electrical resistance. From the viewpoint of ensuring rigidity, the magnetic plate block outer periphery reinforcing member 140 is preferably formed using, for example, stainless steel, carbon fiber, or FRP (Fiber Reinforced Plastics). However, it is not always necessary to use these materials as long as they are made of a non-magnetic and high electric resistance and high strength material.

Next, an example of the configuration of the stator 200 will be described with reference to FIGS. 1, 3, and 4.
The stator 200 includes an upper stator 210 and a lower stator 220. The upper stator 210 and the lower stator 220 are the same, and are two-fold symmetric with the axis passing through the center of the rotor 100 and the axis in the direction perpendicular to the rotation axis 300 (Y-axis direction) as the rotation axis. Arranged in positional relationship.
The upper stator 210 includes an upper yoke portion 211, upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6, and upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6. Here, u, v, and w indicate that they correspond to the U phase, the V phase, and the W phase, respectively. That is, the U-phase current flows as the excitation current in the upper excitation windings 213u1 to 213u6, the W-phase current flows as the excitation current in the upper excitation windings 213w1 to 213w6, and the upper excitation windings 213v1 to 213v6 A V-phase current flows as an exciting current. The excitation windings for each phase are connected in series or in parallel.
As described above, in the present embodiment, the case where the number of phases of the switched reluctance motor is three is shown as an example, but the number of phases of the switched reluctance motor is not limited to three.

As shown in FIGS. 1 and 3, the upper yoke portion 211 is configured by winding a magnetic material plate so as to have a substantially hollow cylindrical shape. In the present embodiment, a case where a grain-oriented electrical steel sheet is used as a magnetic plate will be described as an example.
As the grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel sheet having a glass coating or a grain-oriented electrical steel sheet having an adhesive coating can be used. Moreover, when winding an electromagnetic steel plate so that it may become a substantially hollow cylindrical shape, the direction of the easy magnetization axis | shaft of a directional electromagnetic steel plate is made into the circumferential direction.

  As shown in FIG. 1, the upper yoke portion 211 is coaxial with the rotating shaft 300 and is one direction (Z-axis) of two directions parallel to the rotating shaft 300 rather than the rotor 100. In the positive direction) side. In the following description, one direction (the positive direction of the Z axis) of the two directions parallel to the rotation axis 300 is referred to as the upper side as necessary, and the other direction (the negative direction of the Z axis) side. Is referred to as the lower side if necessary.

  Upper teeth 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are salient poles in stator 200, and are the same. Upper teeth 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are formed by laminating and fixing a plurality of magnetic plates having the same shape and size in an electrically insulated state. . Thereby, the layers of the plurality of magnetic plates are insulated. In the present embodiment, a case where a grain-oriented electrical steel sheet is used as a magnetic plate will be described as an example.

As the grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel sheet having a glass coating or a grain-oriented electrical steel sheet having an adhesive coating can be used. From the viewpoint of suppressing iron loss, the directional electromagnetic steel sheet is preferably thin, but a directional electromagnetic steel sheet (so-called thick material) having a large thickness may be used.
When the directional electromagnetic steel sheet is cut into a (identical) T shape in accordance with the sizes of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6, the direction of the easy axis of magnetization in the directional electromagnetic steel sheet is the T The shape should be in the vertical direction. In addition, the shape which cuts out a grain-oriented electrical steel sheet is not limited to T shape, For example, I shape, a rectangular shape, or a square may be sufficient.

  Then, the plurality of T-shaped grain-oriented electrical steel sheets cut out in this way are laminated in the same direction. At this time, among the directional electromagnetic steel sheets, two directional electromagnetic steel sheets adjacent to each other are insulated. Further, the plurality of grain-oriented electrical steel sheets are fixed by using, for example, an adhesive or the above-described adhesive coating.

  In the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 configured as described above, the direction of the easy magnetization axis in the directional electromagnetic steel sheet is a direction parallel to the rotation axis 300 (Z-axis direction). Thus, they are arranged with a gap in the circumferential direction. FIG. 4 shows an example in which the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are arranged at equal intervals in the circumferential direction.

At this time, the upper end surfaces (wide side) of the T shape of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are set to be on the upper side (positive side of the Z axis). FIG. 1 shows a state where the upper end surfaces (wide side) of the upper teeth 212u1, 212u4 are on the upper side (the positive direction side of the Z axis).
Furthermore, the upper end surface (the T-shaped upper end surface) of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower end surface of the upper yoke portion 211 are electrically connected. It should be glued in an insulated state. For example, an insulating adhesive is applied to at least one of the upper end surface of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower end surface of the upper yoke portion 211, or adhesion is performed. These end faces can be bonded by applying a possible insulating coating.

  In FIG. 1, the lower end surface of the upper yoke portion 211 is bonded to the upper end surface 214u1 of the upper teeth portion 212u1 and the upper end surface 214u4 of the upper teeth portion 212u4 in an electrically insulated state. Show.

The lower end surfaces (the T-shaped lower end surface) of the upper teeth 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are magnetic pole surfaces. FIG. 1 shows a magnetic pole surface 215u1 of the upper tooth portion 212u1 and a magnetic pole surface 215u4 of the upper tooth portion 212u4.
Each of the magnetic pole faces is opposed to the upper end faces of the magnetic plate blocks 120a to 120l in a direction parallel to the rotation axis 300 (Z-axis direction) with the rotation of the rotor 100 with a gap therebetween. Placed in.

  In this way, when the magnetic pole surfaces are opposed to the upper end surfaces of the magnetic plate blocks 120a to 120l in a state of being spaced apart, the centers of the magnetic pole surfaces are respectively set to the magnetic plate blocks 120a to 120a. The upper end face of 120 l is opposed to the radial center position.

  In FIG. 1, the magnetic pole surface 215u1 of the upper tooth portion 212u1 faces the upper end surface 121a of the magnetic plate block 120a with a gap in the direction parallel to the rotation shaft 300 (Z-axis direction). Show. In addition, the magnetic pole surface 215u4 of the upper tooth portion 212u4 is opposed to the upper end surface 121g of the magnetic plate block 120g with a gap in the direction parallel to the rotation shaft 300 (Z-axis direction).

The upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6 are the same.
As shown in FIGS. 1 and 3, the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6 are wound around the narrow regions of the upper teeth 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6, respectively. Turned. At this time, the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6 and the upper teeth 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are electrically insulated.

Moreover, the area of the upper end surface (the end surface bonded in an insulated state with the upper yoke portion 211) of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 is wound around the upper teeth portion. The cross-sectional areas of the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6 in the direction (XY direction) perpendicular to the rotation axis 300 (schematically, upper excitation windings 213u1 to 213u6 and 213w1 213w6, 213v1 to 213v6).
Furthermore, the area of the lower end surface of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 (the magnetic pole surface facing the magnetic body block with a gap) is also wound around the upper teeth. The upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6 are made to exceed the cross-sectional area in the direction perpendicular to the rotation axis 300 (XY direction).

  In FIG. 1, the upper excitation winding 213u1 is wound around the narrow region of the upper teeth 212u1, and the upper excitation winding 213u4 is wound around the narrow region of the upper teeth 212u4. It shows.

The lower stator 220 includes a lower yoke portion 221, lower teeth portions 222u7 and 222u8, and lower excitation windings 223u7 and 223u8.
For convenience of description, two lower teeth 222u7 and 222u8 and two lower excitation windings 223u7 and 223u8 are shown here. However, as described above, the upper stator 210 and the lower stator 220 are the same, and an axis that passes through the center of the rotor 100 and that is perpendicular to the rotation axis 300 (Y-axis direction) is the rotation axis. Are arranged in a positional relationship that is symmetrical twice.

  The lower teeth and lower excitation windings corresponding to the U phase are respectively connected to the upper teeth and upper excitation corresponding to the U phase via the rotor 100 in the direction parallel to the rotation shaft 300 (Z-axis direction). It arrange | positions in the position which mutually opposes with a coil | winding. Similarly, the lower teeth and lower excitation windings corresponding to the W phase are respectively connected to the upper teeth corresponding to the W phase via the rotor 100 in the direction parallel to the rotation shaft 300 (Z-axis direction). The lower tooth portion and the lower excitation winding corresponding to the V phase are arranged at positions facing each other with the upper excitation winding, respectively, in the direction parallel to the rotation shaft 300 (Z-axis direction). The upper teeth portion and the upper excitation winding corresponding to the V phase are disposed at positions facing each other.

  Further, the lower (narrow side) end surfaces (magnetic pole surfaces 225u7, 225u8) of the T shape of the lower teeth portions 222u7, 222u8 are on the upper side, and the magnetic pole surfaces 225u7, 225u8 are respectively magnetic plates. The blocks 120a and 120g are opposed to the lower end faces 122a and 122g with a gap.

Furthermore, as shown in FIG. 1, the upper end surface of the lower yoke portion 221 and the lower end surfaces 224u7 and 224u8 of the lower teeth portions 222u7 and 222u8 are bonded in an electrically insulated state.
Since the other configuration of the lower stator 220 is the same as that of the upper stator 210, detailed description of the lower stator 220 is omitted.

Here, it is preferable that the interval between the magnetic pole surface and the magnetic body block in the upper tooth portion is the same as the interval between the magnetic pole surface and the magnetic body block in the lower tooth portion.
The direction of the magnetic pole surface in the upper tooth portion, the magnetic pole surface in the lower tooth portion, the upper end surface of the magnetic plate block, and the lower end surface of the magnetic plate block is perpendicular to the rotating shaft 300 (parallel). It is preferable that

Moreover, it is preferable to use a heat-treated electromagnetic steel plate as the electromagnetic steel plate constituting the upper stator 210 and the lower stator 220. This is because distortion in the electromagnetic steel sheet can be removed.
The winding method of the upper excitation winding and the lower excitation winding is not particularly limited, and concentrated winding, distributed winding, or other winding methods may be used.

  When the switched reluctance motor having the above configuration is driven to rotate the rotor 100, for example, the magnetic plate blocks 120a to 120l of the rotor 100 and the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 are used. The U-phase upper excitation windings 213u1 to 213u6 and the lower side so that the waveforms of the voltages induced in the upper stator 210 and the lower stator 220 are rectangular waves according to the positional relationship with the lower teeth portion. The timing for supplying an excitation current to the excitation winding, the W-phase upper excitation winding 213w1 to 213w6 and the lower excitation winding, and the V-phase upper excitation winding 213v1 to 213v6 and the lower excitation winding is shifted. As a result, a magnetic attractive force acts between the magnetic surface of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower teeth and the upper and lower end faces of the magnetic plate blocks 120a to 120l. The location is continuously switched in the circumferential direction, and the rotor 100 rotates.

  A directional electromagnetic steel sheet is suitable for driving a motor with an excitation voltage of a rectangular wave because the magnetic permeability in a low magnetic field is one digit larger than that of a non-oriented electromagnetic steel sheet. Further, the directional electrical steel sheet has a higher saturation magnetic flux density than the non-oriented electrical steel sheet. Considering the difference between the fundamental wave components of the sine wave and rectangular wave waveforms, if a directional electromagnetic steel sheet is used for the magnetic material plate blocks 120a to 120l of the rotor 100, it is switched compared to a case where a non-oriented electromagnetic steel sheet is used. The torque of the reluctance motor can be increased.

However, when a directional electromagnetic steel sheet is used in the rotor of a conventional switched reluctance motor, a rotating magnetic field is generated in the directional electromagnetic steel sheet, and thus the excellent characteristics of such a directional electromagnetic steel sheet cannot be fully utilized. It was. On the other hand, in this embodiment, the rotating magnetic field generated in the grain-oriented electrical steel sheet can be suppressed. Therefore, the torque of the switched reluctance motor can be increased by using a grain-oriented electrical steel sheet for the rotor 100 so that the voltage waveforms induced in the upper stator 210 and the lower stator 220 are rectangular waves. it can.
However, this is not always necessary, and the waveform of the voltage induced in the upper stator 210 and the lower stator 220 may be, for example, a sine wave.

  Here, similarly to a general switched reluctance motor, the intervals in the circumferential direction of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower teeth are determined in the circumferential direction of the magnetic plate blocks 120a to 120l. It is preferable to set the interval to 1/3, and more preferable to set it to 2/3. This is because the rotor 100 can be stably rotated in an arbitrary rotation direction as in the case of a general switched reluctance motor. In the example shown in FIG. 2 and FIG. 4, for the convenience of description, the intervals in the circumferential direction of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 are the intervals in the circumferential direction of the magnetic plate blocks 120a to 120l. The case of 2/3 of is shown as an example. However, when the number of phases of the switched reluctance motor is not three, it is preferable that the interval in the circumferential direction of the iron core is 1 / number of phases in the circumferential direction of the magnetic plate block.

  As described above, in this embodiment, the magnetic plate blocks 120 a to 120 l arranged at equal intervals in the circumferential direction are used as salient poles of the rotor 100. Upper teeth portions (212u1, 212u4) having magnetic pole faces (215u1, 215u4) arranged at intervals in a direction parallel to the rotation shaft 300 with respect to the upper end faces (121a, 121g) of the magnetic plate blocks 120a-120l. ) And magnetic pole plates (215u7, 215u8) disposed at intervals in the direction parallel to the rotation shaft 300 with respect to the lower end surfaces (122a, 122g) of the magnetic plate blocks 120a to 120l. Part (212u7, 212u8) is electrically insulated from the upper end face (214u1, 214u4) of the upper tooth part (212u1, 212u4) and the lower end face (214u7, 214u8) of the lower tooth part (212u7, 212u8) The magnetic steel sheet is wound so that it is bonded in a state where it is attached and is coaxial with the rotary shaft 300. Upper yoke portion 211 formed by turning, the lower yoke portion 221, constituting the core of the stator 200.

  Therefore, the deformation of the rotor 100 can be suppressed by setting the magnetic attractive force between the rotor 100 and the stator 200 to one direction parallel to the magnetic pole surface of the stator 200 (upper teeth portion, lower teeth portion). It becomes easy. Further, the direction parallel to the rotary shaft 300, which is the direction in which the magnetic attractive force between the rotor 100 and the stator 200 is applied, can be set to the direction in which the rigidity of the upper yoke portion 211 and the lower yoke portion 221 is high. Therefore, it becomes easy to ensure the rigidity of the rotor 100, and vibration and noise in the switched reluctance motor can be suppressed. Further, a large magnetic attractive force that moves in the circumferential direction acts on the magnetic plate blocks 120a to 120l of the rotor 100 sandwiched between the magnetic pole surfaces of the stator 200 (upper teeth portion, lower teeth portion). A large magnetic attractive force does not work in the direction (Y-axis direction or the like) and the direction parallel to the rotation axis 300 (Z-axis direction). Therefore, vibration of the thin disk-shaped rotor 100 can be suppressed.

Further, the magnetic flux from the upper tooth portion and the lower tooth portion does not enter perpendicularly to the plate surfaces of the upper yoke portion 211 and the lower yoke portion 221, but follows the plate surfaces of the upper yoke portion 211 and the lower yoke portion 221. The upper yoke portion 211 and the lower yoke portion 221 are entered. Therefore, eddy currents generated in the plate surfaces of the upper yoke portion 211 and the lower yoke portion 221 can be suppressed. Therefore, it can suppress that the efficiency of a switched reluctance motor falls significantly.
As described above, according to the present embodiment, it is possible to realize a highly efficient switched reluctance motor that reduces vibration and noise, which is a drawback of the conventional switched reluctance motor, and has high torque and low iron loss.

  The stator yoke (upper yoke part, lower yoke part), teeth (upper teeth part, lower teeth part) and excitation windings (upper excitation winding, lower excitation winding) are made into individual modules. The stator 200 is configured by combining the above. Therefore, the work of winding the excitation winding around the stator is easier than that of the stator in which the yoke and the teeth are integrated. Further, the shape of the stator yoke and teeth can be made simple. Therefore, even if the grain-oriented electrical steel sheet, which is difficult to punch, is used, the stator core can be easily processed. Therefore, the switched reluctance motor can be easily manufactured.

(Modification)
<Modification 1>
In the present embodiment, the case where the rotating electrical machine is a switched reluctance motor has been described as an example. However, by operating the rotating electrical machine having the configuration shown in FIGS. 1 to 4 as a generator, a switched reluctance generator is used. It can be.

<Modification 2>
In this embodiment, the case where a grain-oriented electrical steel sheet is used as an example of the magnetic plate constituting the magnetic plate blocks 120a to 120l has been described. However, the magnetic material plates constituting the magnetic material plate blocks 120a to 120l are not limited to directional electromagnetic steel plates. For example, the magnetic plates constituting the magnetic plate blocks 120a to 120l may be soft magnetic plates (for example, non-directional electromagnetic steel plates) other than the directional electromagnetic steel plates.

<Modification 3>
In the present embodiment, an example in which the magnetic plate inter-block reinforcing members 130a to 130l are arranged so as to fill the entire region between two adjacent magnetic plate blocks that are spaced apart from each other in the circumferential direction is taken as an example. I gave it as an explanation. However, if the magnetic plate blocks 120a to 120l are not deformed and moved due to the stress in the circumferential direction, or if the deformation and the movement are within a range where there is no practical problem, they are mutually in the circumferential direction. A part or all of the region between two magnetic plate blocks adjacent to each other with a gap may be formed as a gap. When the entire area between two magnetic plate blocks adjacent to each other with a gap in the circumferential direction is used as a gap, nothing is provided in the region, and reinforcement between the magnetic plate blocks is performed. The members 130a to 130l are not necessary.

<Modification 4>
In this embodiment, the case where a grain-oriented electrical steel sheet is used as an example has been described as the magnetic plate constituting the upper yoke portion 211 and the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6. However, the magnetic body plate which comprises the upper yoke part 211 and the upper teeth part 212u1-212u6, 212w1-212w6, 212v1-212v6 is not limited to a grain-oriented electrical steel sheet. For example, the magnetic material plate constituting the upper yoke portion 211 and the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 may be used as a soft magnetic material plate (for example, a non-oriented electrical steel plate) other than the directional electrical steel plate. Good. The above also applies to the lower yoke portion and the lower teeth portion.

<Modification 5>
In this embodiment, the case where the cross section perpendicular | vertical to the magnetic path of the magnetic body board blocks 120a-120l is a rectangular shape of the same magnitude | size irrespective of a location was mentioned as an example, and was demonstrated. However, this is not always necessary, and at least one of the shape and size of the cross section perpendicular to the magnetic path of the magnetic plate blocks 120a to 120l may be different depending on the location. Moreover, the cross section perpendicular | vertical to the magnetic path of the magnetic body board blocks 120a-120l is not limited to a rectangular shape, For example, a square or a polygon may be sufficient.

<Modification 6>
In this embodiment, the case where the cross sections perpendicular to the magnetic paths of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are rectangular shapes having the same size regardless of the location has been described as an example. However, it is not always necessary to do this. At least one of the shape and size of the cross section perpendicular to the magnetic path of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 is different depending on the location. Also good. Moreover, the cross section perpendicular | vertical to the magnetic path of upper teeth part 212u1-212u6, 212w1-212w6, 212v1-212v6 is not limited to a rectangular shape, For example, a square or a polygon may be sufficient. The above also applies to the lower yoke portion and the lower teeth portion.

  It should be noted that the embodiments of the present invention described above are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  100: rotor, 110: rotating shaft mounting member, 120a to 120l magnetic plate block, 130a to 130l: reinforcing member between magnetic plate blocks, 140: magnetic plate block outer periphery reinforcing member, 200: stator, 210: upper stator, 211: Upper yoke portion, 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6: Upper teeth portion, 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6: Upper excitation winding, 214u1, 214u4: Upper end surface of the upper teeth portion 215u1, 215u4: magnetic pole surface, 220: lower stator, 221: lower yoke part, 222u7, 222u8: lower teeth part, 223u7, 223u8: lower excitation winding, 224u7, 224u8: lower teeth part Side end face, 225u7 225U8: pole faces, 300: rotary shaft

Claims (9)

A rotating electrical machine that is a switched reluctance motor or a switched reluctance generator,
A rotor,
A stator,
The rotor is a plurality of magnetic plate blocks arranged at intervals in the circumferential direction of the rotating electrical machine, each of which has a plurality of magnetic plates having a plurality of magnetic plates stacked in the circumferential direction. Has a body plate block,
The stator is two yoke portions disposed at positions facing each other with a space therebetween via the rotor in a direction parallel to the rotation axis of the rotor, each of which is a rotation axis of the rotor Two yoke portions having magnetic plates wound so as to be coaxial,
Among the end faces of the yoke part in a direction parallel to the rotation axis of the rotor, a plurality of teeth parts arranged to have an interval in the circumferential direction with respect to the end face closer to the rotor, A plurality of teeth portions having magnetic plates laminated in a plurality of stages in the circumferential direction,
Along with the rotation of the rotor, among the end surfaces of the teeth portion in the direction parallel to the rotation axis of the rotor, the end surface closer to the rotor and the magnetic plate block in the direction parallel to the rotation axis of the rotor Among the end surfaces of the rotating electric machine, an end surface closer to the stator is opposed to the rotor with a gap in a direction parallel to the rotation axis of the rotor. The magnetic plate constituting the magnetic plate block is a grain-oriented electrical steel plate,
2. The rotating electrical machine according to claim 1, wherein a direction of an easy magnetization axis of the grain-oriented electrical steel sheet constituting the magnetic plate block is a direction parallel to the rotation axis. The magnetic plate constituting the teeth portion and the magnetic plate constituting the yoke portion are directional electromagnetic steel plates,
The direction of the easy magnetization axis of the grain-oriented electrical steel sheet constituting the teeth portion is a direction parallel to the rotation axis,
The rotating electrical machine according to claim 1 or 2, wherein the direction of the easy axis of the grain-oriented electrical steel sheet constituting the yoke portion is the circumferential direction. The stator has an excitation winding wound around the teeth portion,
The area of the surface of the teeth portion facing the yoke portion and the area of the surface of the teeth portion facing the rotor are perpendicular to the rotation axis of the rotor of the excitation winding wound around the teeth portion. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine exceeds a cross-sectional area in any direction.   The rotating electrical machine according to claim 1, wherein the teeth portion and the yoke portion are electrically insulated.   Along with the rotation of the rotor, the center of the end surface closer to the rotor among the end surfaces of the teeth portion in the direction parallel to the rotation axis of the rotor is respectively the direction in the direction parallel to the rotation axis of the rotor. 2. The center in the radial direction of the end face closer to the stator among the end faces of the magnetic plate block is opposed to each other with an interval in a direction parallel to the rotation axis of the rotor. The rotating electrical machine according to any one of?   Of the end faces of the plurality of teeth portions in the direction parallel to the rotation axis of the rotor, the end face closer to the rotor and the end faces of the plurality of magnetic plate blocks in the direction parallel to the rotation axis of the rotor The rotating electrical machine according to any one of claims 1 to 6, wherein a distance from an end face closer to the stator is the same. The plurality of teeth portions and the plurality of magnetic plate blocks are arranged at equal intervals in the circumferential direction, respectively.
The interval in the circumferential direction of the plurality of teeth portions is a fraction of the number of phases in the circumferential direction of the plurality of magnetic plate blocks, according to any one of claims 1 to 7. The rotating electrical machine described. The number of phases of the rotating machine is three,
The plurality of teeth portions and the plurality of magnetic plate blocks are arranged at equal intervals in the circumferential direction, respectively.
The interval in the circumferential direction of the plurality of tooth portions is two-thirds of the interval in the circumferential direction of the plurality of magnetic body plate blocks. Rotating electric machine.

Images