JP6631102B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electric 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, a switched reluctance motor has recently been receiving attention.

  In a switched reluctance motor, a rotor and a stator are arranged such that salient poles of the rotor and a stator (stator) face each other, and by sequentially switching excitation currents flowing through a plurality of excitation coils wound around the stator. Then, a magnetic attraction force is generated in the rotor in the rotation direction (circumferential direction) to rotate the rotor.

As described in Patent Document 1, a conventional switched reluctance motor is generally configured as follows.
The stator has a yoke extending in the circumferential direction, and a plurality of teeth extending in the rotation axis direction from the inner circumferential end 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 plurality of salient poles face the tip surfaces of the teeth of the stator at an interval. Attached to the rotating shaft.

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

In addition, a general rotating electric machine including a switched reluctance motor and a switched reluctance generator has a structure in which a teeth portion and a yoke portion of a stator are integrated. For this reason, it is not easy to wind the exciting coil around the teeth portion.
In view of this, Patent Document 2 proposes a rotating electric machine including a stator in which a yoke portion and a teeth portion are separated from each other. Specifically, in Patent Document 2, the core of the stator 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 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. Be 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 attraction between the rotor and the stator moves (rotates) in the circumferential direction. .
Further, in the technique described in Patent Document 2, since the magnetic flux from the teeth enters the plate surface of the soft magnetic steel strip constituting the yoke part perpendicularly, eddy current is generated in the plate surface of the soft magnetic steel strip. appear. Therefore, there is a possibility that the efficiency of the rotating electric machine is 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 significantly reducing efficiency while reducing vibration and noise. The purpose is to:

The rotating electric machine of the present invention is a rotating electric machine that is a switched reluctance motor or a switched reluctance generator, and has a rotor and a stator, and the rotor has an interval in a circumferential direction of the rotating electric machine. A plurality of magnetic plate blocks arranged, each having a plurality of magnetic plate blocks having magnetic plates stacked in a plurality of stages in the circumferential direction, wherein the stator has a rotating shaft of the rotor. Two yoke portions disposed at positions facing each other with a space therebetween in the direction parallel to the rotor, and each of the two yoke portions is wound so as to be coaxial with the rotation axis of the rotor. Two yoke portions each having a magnetic plate, and, among end surfaces of the yoke portion in a direction parallel to the rotation axis of the rotor, an end surface closer to the rotor, A plurality of teeth arranged so as to have an interval in the direction, each having a plurality of teeth having a plurality of magnetic plates laminated in the circumferential direction in the circumferential direction, the rotation of the rotor Accordingly, of the end faces of the teeth portion in a direction parallel to the rotation axis of the rotor, an end face closer to the rotor and an end face of the magnetic plate block in a direction parallel to the rotation axis of the rotor. An end face closer to the stator faces with an interval in a direction parallel to the rotation axis of the rotor, and a magnetic plate forming the teeth portion and a magnetic plate forming the yoke portion are , wherein the magnetic steel sheets der Rukoto.

  Advantageous Effects of Invention 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 significantly reducing efficiency while reducing vibration and noise.

It is a figure showing an example of a switch reluctance motor longitudinal section. FIG. 2 is a diagram showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a line II shown in FIG. 1. FIG. 2 is a diagram showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a line II-II shown in FIG. 1. FIG. 3 is a diagram showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a line III-III shown in FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, for convenience of description and notation, only parts necessary for description are shown in a simplified manner as necessary. The X, Y, and Z coordinates shown in each figure show the relationship between the directions in each figure, and the origins of the X, Y, and Z coordinates are common to each figure and are limited to the positions shown in each figure. Not done. Further, in the present embodiment, a case where the rotating electric machine is a switched reluctance motor will be described as an example.

  1 to 4 are diagrams illustrating an example of the configuration 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 rotation axis and along the rotation axis. FIG. 2 is a diagram (II cross-sectional view) showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a line II shown in FIG. FIG. 3 is a diagram (II-II cross section) showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a II-II portion shown in FIG. FIG. 4 is a view showing a cross section when the switched reluctance motor shown in FIG. 1 is cut along a line III-III shown in FIG. 1 (a cross-sectional view taken along a line III-III).

In FIG. 1, the switched reluctance motor has 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.

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

The rotating shaft mounting member 110 is a structural material made of a non-magnetic 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. In the center of the rotating shaft mounting member 110, a through hole is formed with the inner peripheral surface of the inner peripheral portion 111 as an edge. This through hole has a size corresponding to the rotation axis 300. The length of the inner peripheral portion 111 in the direction (Z-axis direction) parallel to the rotation axis 300 is longer than the intermediate portion 112 and the outer peripheral portion 113. The length of the inner peripheral portion 111 in the radial direction (Y-axis direction or the like) of the switched reluctance motor is shorter than 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 that comes into contact with the inner peripheral surfaces of the magnetic plate blocks 120a to 120l and the inter-magnetic plate block reinforcing members 130a to 130l described later (particularly, see FIG. 2). The length of the outer peripheral portion 113 in a direction parallel to the rotation axis 300 (Z-axis direction) is shorter than the inner peripheral portion 111, longer than the intermediate portion 112, and substantially the same as the magnetic plate blocks 120a to 120l. The length of the outer peripheral portion 113 in the radial direction (Y-axis direction or the like) is longer than the inner peripheral portion 111 and shorter than the intermediate portion 112.

  The intermediate part 112 is a part whose inner peripheral end is connected to the outer peripheral end of the inner peripheral part 111 and whose outer peripheral end is connected to the inner peripheral end of the outer peripheral part 113. The length of the intermediate part 112 in the direction parallel to the rotation axis 300 (Z-axis direction) is shorter than the inner peripheral part 111 and the outer peripheral part 113. Further, the length of the intermediate portion 112 in the radial direction (Y-axis direction or 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 112a to 112l are formed in an area on the outer peripheral side of the intermediate portion 112 with a space therebetween 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, an aluminum alloy, engineering plastic, or the like from the viewpoint of securing rigidity. It is preferred that However, as described above, if a non-magnetic material is used, it is not always necessary to use these materials. In addition, for example, the shape of the rotating shaft mounting member 110 may be a spoke shape to reduce the weight of the switch reluctance motor (rotor).

  The magnetic plate blocks 120a to 120l are the same. The magnetic plate blocks 120a to 120l are formed by laminating and fixing a plurality of magnetic plates having the same shape and size while being electrically insulated from each other. Thereby, the layers between 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 body 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 thickness of the grain-oriented electrical steel sheet is preferably thin, but a grain-oriented electrical steel sheet having a large thickness (so-called thick material) may be used.
When cutting the grain-oriented electrical steel sheet into a rectangle according to the size of the magnetic plate blocks 120a to 120l, the easy axis of magnetization of the grain-oriented electrical steel sheet is set to be in a direction parallel to a specific side of the rectangle. . The shape of the grain-oriented electrical steel sheet is not limited to a rectangular shape, and may be, for example, a square.

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

  The magnetic plate blocks 120a to 120l configured as described above are spaced from each other in the circumferential direction such that the direction of the easy axis of magnetization of the grain-oriented electromagnetic steel sheet is parallel to the rotation axis 300 (Z-axis direction). It is arranged in the 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 axis 300 (Z-axis direction) are 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 (outer peripheral portion 113).

In the present embodiment, the magnetic plate blocks 120a to 120l arranged in this manner allow a portion close to the outer peripheral edge of the rotor 100 to be spaced apart in the circumferential direction in a direction parallel to the rotating shaft 300 (Z (In the axial direction).
Further, as shown in FIGS. 1 and 2, in the present embodiment, no yoke (back yoke) is provided for the magnetic plate blocks 120a to 120l. Therefore, it is possible to reduce the use amount of the magnetic material plate (directional magnetic steel plate), and to realize the weight reduction and the suppression of the inertial force of the switched reluctance motor (rotor 100).

  The reinforcing members 130a to 130l between the magnetic plate blocks are arranged between two adjacent magnetic plate blocks at intervals in the circumferential direction. At this time, the circumferential end faces of the inter-magnetic plate block reinforcing members 130a to 130l and the circumferential end surfaces of the magnetic plate blocks sandwiching the inter-magnetic plate block reinforcing members are fixed. Thereby, it is possible to prevent the magnetic plate blocks 120a to 120l from being deformed and moved by receiving a stress in the circumferential direction. Further, the inner peripheral surfaces of the reinforcing members 130a to 130l between the magnetic plate blocks are fixed to the outer peripheral surface of the rotating shaft mounting member 110 (the outer peripheral portion 113).

  The reinforcing members 130a to 130l between the magnetic body plate blocks are formed of a non-magnetic and non-conductive material. The reinforcing members 130a to 130l between the magnetic body plate blocks are preferably formed using, for example, engineering plastics from the viewpoint of securing rigidity. However, if a non-magnetic and non-conductive material is used, it is not 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 an eddy current, particularly, a current path surrounding the magnetic plate blocks 120a to 120l. it can.

  The magnetic plate block outer peripheral reinforcing member 140 is a thin ring-shaped member. The inner diameter of the magnetic plate block outer peripheral reinforcing member 140 is the same as or the same as the radial length from the rotating 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. It has a slightly longer length than that. The length of the magnetic plate block outer peripheral 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 peripheral reinforcing members 140 are attached to the outer peripheral surfaces of the magnetic plate blocks 120a to 120l and the magnetic plate inter-block reinforcing members 130a to 130l. At this time, the inner peripheral surface of the magnetic plate block outer peripheral reinforcing member 140 is fixed to the outer peripheral surfaces of the magnetic plate blocks 120a to 120l and the inter-magnetic plate block reinforcing members 130a to 130l. Accordingly, it is possible to prevent the magnetic plate blocks 120a to 120l and the reinforcing members 130a to 130l between the magnetic plate blocks from scattering due to centrifugal force generated by rotation of the switched reluctance motor (rotor 100).

  Further, the reinforcing members 130a to 130l between the magnetic plate blocks are provided between the inner peripheral surface of the outer peripheral reinforcing member 140 of the magnetic plate block and the outer peripheral portion 113 of the rotating shaft mounting member 110. It may be molded so as to fill the gap.

  The magnetic plate block outer peripheral reinforcing member 140 is formed of a non-magnetic, high-resistance, high-strength material. From the viewpoint of securing rigidity, the magnetic plate block outer peripheral reinforcing member 140 is preferably formed using, for example, stainless steel, carbon fiber, or FRP (Fiber Reinforced Plastics). However, if a high-strength nonmagnetic and high-resistance material is used, it is not always necessary to use these materials.

Next, an example of the configuration of the stator 200 will be described with reference to FIGS. 1, 3, and 4. FIG.
Stator 200 has upper stator 210 and lower stator 220. The upper stator 210 and the lower stator 220 are the same, and are symmetrical twice with an axis passing through the center of the rotor 100 and an axis perpendicular to the rotation axis 300 (Y-axis direction) as the rotation axis. They are arranged in a positional relationship.
The upper stator 210 has an upper yoke 211, upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6, and upper excitation windings 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6. Here, u, v, and w indicate that they correspond to the U, V, and W phases, respectively. That is, a U-phase current flows as an exciting current in the upper excitation windings 213u1 to 213u6, a W-phase current flows as an excitation current in the upper excitation windings 213w1 to 213w6, and a U-phase current flows as the excitation current. A V-phase current flows as the exciting current. The excitation windings of 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 described 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 body plate into a substantially hollow cylindrical shape. In the present embodiment, a case where a grain-oriented electrical steel sheet is used as a magnetic body 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. When the magnetic steel sheet is wound into a substantially hollow cylindrical shape, the direction of the axis of easy magnetization of the directional magnetic steel sheet is set to be the circumferential direction.

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

  The upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are salient poles in the stator 200 and are the same. The upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are formed by stacking and fixing a plurality of magnetic plates having the same shape and size in a state where they are electrically insulated from each other. . Thereby, the layers between 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 body 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 thickness of the grain-oriented electrical steel sheet is preferably thin, but a grain-oriented electrical steel sheet having a large thickness (so-called thick material) may be used.
When the grain-oriented electrical steel sheet is cut into the (identical) T shape according to the size of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6, the direction of the axis of easy magnetization in the grain-oriented electrical steel sheet is T So that it is in the vertical direction of the shape. The shape from which the grain-oriented electrical steel sheet is cut out is not limited to the T shape, and may be, for example, an I shape, a rectangular shape, or a square.

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

  The upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 configured as described above are configured such that the direction of the easy axis of magnetization of the grain-oriented electrical steel sheet is parallel to the rotation axis 300 (Z-axis direction). , And are arranged with a space in the circumferential direction. FIG. 4 shows an example in which 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 (wider side) end surface of the T shape of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 is set to the upper side (positive direction side of the Z axis). FIG. 1 shows a state in which the upper (wider side) end surface of the T shape of the upper teeth portions 212u1 and 212u4 is on the upper side (positive direction side of the Z axis).
Further, the upper end surfaces (the upper end surfaces of the T-shape) of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 arranged in this way, and the lower end surface of the upper yoke portion 211 are electrically connected. It should be bonded in an insulated state. For example, an insulating adhesive is applied to at least one of the upper end surfaces of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower end surface of the upper yoke portion 211, or the adhesive is applied. By applying a possible insulating coating, these end faces can be glued.

  FIG. 1 illustrates a state in which the lower end surface of the upper yoke 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 (lower end surfaces of the T-shape) of the upper teeth portions 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 teeth portion 212u1 and a magnetic pole surface 215u4 of the upper teeth portion 212u4.
Each of the magnetic pole faces faces 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 space therebetween. Placed in

  In this way, when the magnetic pole surfaces face the upper end surfaces of the magnetic plate blocks 120a to 120l with a space therebetween, the centers of the magnetic pole surfaces are respectively set to the magnetic plate blocks 120a to 120l. The upper end face of 120 l is opposed to the center position in the radial direction.

  FIG. 1 illustrates a state in which the magnetic pole surface 215u1 of the upper teeth portion 212u1 faces the upper end surface 121a of the magnetic plate block 120a with a space in a direction parallel to the rotation axis 300 (Z-axis direction). Show. Also, a state in which the magnetic pole surface 215u4 of the upper teeth portion 212u4 faces the upper end surface 121g of the magnetic plate block 120g with a space in a direction parallel to the rotation axis 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 4 , the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6 are respectively wound around narrower areas of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6. Turned. At this time, the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6 and the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 are electrically insulated.

In addition, the area of the upper end surface (the end surface that is bonded to the upper yoke portion 211 in an insulated state) of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 is wound around the upper teeth portions. The cross-sectional area of the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6 in the direction (XY direction) perpendicular to the rotation axis 300 (generally, upper excitation windings 213u1 to 213u6, 213w1 shown in FIG. 4) 213w6, 213v1 to 213v6).
Furthermore, the area of the lower end surface (the magnetic pole surface facing the magnetic block with an interval) between the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 is also wound around the upper teeth portions. The cross-sectional area of the upper excitation windings 213u1 to 213u6, 213w1 to 213w6, and 213v1 to 213v6 in the direction perpendicular to the rotation axis 300 (the XY direction) is increased.

  In FIG. 1, a state where the upper excitation winding 213u1 is wound around a narrow region of the upper teeth portion 212u1 and a state where the upper excitation winding 213u4 is wound around a narrow region of the upper teeth portion 212u4. And

The lower stator 220 has a lower yoke portion 221, lower teeth portions 222u7, 222u8, and lower excitation windings 223u7, 223u8.
For convenience of notation, two lower teeth portions 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 is perpendicular to the rotation axis 300 (Y-axis direction) is defined as the rotation axis. Are arranged in a two-fold symmetrical positional relationship.

  The lower teeth portion and the lower excitation winding corresponding to the U phase are respectively connected to the upper teeth portion and the upper excitation portion corresponding to the U phase via the rotor 100 in a direction parallel to the rotating shaft 300 (Z-axis direction). It is arranged at a position opposite to the winding. Similarly, the lower teeth portion and the lower excitation winding corresponding to the W phase are respectively connected to the upper teeth portion corresponding to the W phase via the rotor 100 in a direction parallel to the rotating shaft 300 (Z-axis direction). The lower teeth portion and the lower excitation winding, which are arranged at positions facing each other with respect to the upper excitation winding and correspond to the V-phase, respectively, in a direction parallel to the rotating shaft 300 (Z-axis direction). Are disposed at positions facing each other with the upper teeth portion and the upper excitation winding corresponding to the V phase.

  Also, the lower (narrower) end faces (magnetic pole faces 225u7, 225u8) of the T-shape of the lower teeth portions 222u7, 222u8 are set to be on the upper side, and the magnetic pole faces 225u7, 225u8 are respectively magnetic substance plates. The lower end faces 122a and 122g of the blocks 120a and 120g are opposed to each other with a space therebetween.

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

Here, it is preferable that the interval between the magnetic pole surface and the magnetic block in the upper teeth portion is equal to the interval between the magnetic pole surface and the magnetic block in the lower teeth portion.
The directions of the magnetic pole surface in the upper teeth portion, the magnetic pole surface in the lower teeth portion, the upper end surface of the magnetic plate block, and the lower end surface of the magnetic plate block are perpendicular (parallel) to the rotation axis 300. It is preferable that

Further, it is preferable to use a heat-treated electromagnetic steel sheet as the electromagnetic steel sheets forming upper stator 210 and lower stator 220. This is because distortion in the magnetic 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 portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 And the U-phase upper excitation windings 213u1 to 213u6 and the lower side so that the waveform of the voltage induced in the upper stator 210 and the lower stator 220 becomes a rectangular wave according to the positional relationship with the lower teeth portion. The timing at which the exciting current flows through the excitation winding, the W-phase upper excitation windings 213w1 to 213w6, the lower excitation winding, the V-phase upper excitation windings 213v1 to 213v6, and the lower excitation winding is shifted. Thereby, magnetic attraction acts between the magnetic pole surfaces of the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower teeth and the upper and lower end surfaces of the magnetic plate blocks 120a to 120l. The locations are continuously switched in the circumferential direction, and the rotor 100 rotates.

  The grain-oriented electrical steel sheet has an order of magnitude higher magnetic permeability in a low magnetic field than the non-oriented electrical steel sheet, and thus is suitable for driving a motor with a rectangular wave excitation voltage. The grain-oriented 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 the rectangular wave, the use of grain-oriented electrical steel sheets for the magnetic plate blocks 120a to 120l of the rotor 100 is more advantageous than the case of using non-oriented electrical steel sheets. The torque of the reluctance motor can be increased.

However, when a grain-oriented electrical steel sheet is used for the rotor of a conventional switched reluctance motor, a rotating magnetic field is generated in the grain-oriented electrical steel sheet, so that the excellent characteristics of such a grain-oriented electrical steel sheet cannot be fully utilized. Was. On the other hand, in the present embodiment, the rotating magnetic field generated in the grain-oriented electrical steel sheet can be suppressed. Therefore, it is possible to increase the torque of the switched reluctance motor by using a grain-oriented electrical steel sheet for the rotor 100 and making the waveform of the voltage induced in the upper stator 210 and the lower stator 220 rectangular. it can.
However, this is not 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 circumferential intervals of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 and the lower teeth portions are determined by the circumferential direction of the magnetic plate blocks 120a to 120l. Is preferably one third, and more preferably two thirds. This is because, in this manner, the rotor 100 can be stably rotated in an arbitrary rotation direction, similarly to a general switched reluctance motor. In the examples shown in FIGS. 2 and 4, for convenience of notation, the intervals in the circumferential direction of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 are equal to the intervals in the circumferential direction of the magnetic plate blocks 120a to 120l. 2/3 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 set to be 1 / the number of phases in the circumferential direction of the magnetic plate block.

  As described above, in the present embodiment, the magnetic plate blocks 120a to 120l arranged at equal intervals in the circumferential direction are salient poles of the rotor 100. Upper teeth portions (212u1, 212u4) having magnetic pole surfaces (215u1, 215u4) arranged at an interval in a direction parallel to the rotation axis 300 with respect to upper end surfaces (121a, 121g) of the magnetic plate plates 120a to 120l. ), And lower teeth having magnetic pole surfaces (215u7, 215u8) arranged at a distance from the lower end surfaces (122a, 122g) of the magnetic plate blocks 120a to 120l in a direction parallel to the rotation axis 300. (212u7, 212u8), the upper end surfaces (214u1, 214u4) of the upper teeth portions (212u1, 212u4), and the lower end surfaces (214u7, 214u8) of the lower teeth portions (212u7, 212u8). The magnetic steel sheet is wound so that it is adhered in the Upper yoke portion 211 formed by turning, the lower yoke portion 221, constituting the core of the stator 200.

  Therefore, the magnetic attraction between the rotor 100 and the stator 200 is set to one direction parallel to the magnetic pole surfaces of the stator 200 (upper teeth portion, lower teeth portion), thereby suppressing deformation of the rotor 100. It will be easier. In addition, the direction parallel to the rotating shaft 300, which is the direction in which the magnetic attraction force is applied between the rotor 100 and the stator 200, can be set to the direction in which the rigidity of the upper yoke 211 and the lower yoke 221 is high. Therefore, it is easy to secure the rigidity of the rotor 100, and vibration and noise in the switched reluctance motor can be suppressed. A large magnetic attraction force moving 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 attraction does not act 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.

Also, the magnetic flux from the upper teeth portion and the lower teeth portion does not enter the plate surfaces of the upper yoke portion 211 and the lower yoke portion 221 vertically, but follows the plate surfaces of the upper yoke portion 211 and the lower yoke portion 221. Into the upper yoke 211 and the lower yoke 221. Therefore, eddy current generated in the plate surfaces of the upper yoke 211 and the lower yoke 221 can be suppressed. Therefore, it is possible to suppress a large decrease in the efficiency of the switched reluctance motor.
As described above, in the present embodiment, it is possible to realize a high-efficiency switched reluctance motor having high torque and low iron loss by reducing vibration and noise, which are disadvantages of the conventional switched reluctance motor.

  In addition, the stator yoke (upper yoke, lower yoke), teeth (upper and lower teeth), and exciting windings (upper and lower exciting windings) are formed as individual modules. Are combined to form the stator 200. Therefore, the operation of winding the exciting winding around the stator becomes easier as compared with a stator in which the yoke and the teeth are integrated. Further, the shapes of the yoke and the teeth of the stator can be made simple. Therefore, even when a grain-oriented electrical steel sheet that is difficult to punch is used, machining of the iron core of the stator can be easily performed. Therefore, it is possible to easily manufacture the switched reluctance motor.

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

<Modification 2>
In the present embodiment, an example has been described in which a directional electromagnetic steel plate is used as the magnetic plate forming the magnetic plate blocks 120a to 120l. However, the magnetic plates constituting the magnetic plate blocks 120a to 120l are not limited to grain-oriented electromagnetic steel plates. For example, the magnetic plates constituting the magnetic plate blocks 120a to 120l may be soft magnetic plates (eg, non-directional magnetic steel plates) other than the directional magnetic steel plates.

<Modification 3>
In the present embodiment, an example is given in which the reinforcing members 130a to 130l between the magnetic plate blocks are arranged so as to fill the entire region between two adjacent magnetic plate blocks with an interval in the circumferential direction. I explained it. However, if the magnetic plate blocks 120a to 120l are not deformed and moved by receiving the stress in the circumferential direction, or if the deformed and moved are in a range where there is no practical problem, the magnetic plate blocks 120a to 120l are mutually reciprocal in the circumferential direction. A part or all of a region between two magnetic plate blocks adjacent to each other with a space may be formed as a gap. If the entire region between two adjacent magnetic plate blocks is spaced apart from each other in the circumferential direction, and nothing is provided in the space, nothing is provided in the region, and reinforcement between the magnetic plate blocks is performed. The members 130a to 130l become unnecessary.

<Modification 4>
In the present embodiment, an example has been described in which a directional electromagnetic steel sheet is used as a magnetic plate constituting the upper yoke 211 and the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6. However, the magnetic plates constituting the upper yoke 211 and the upper teeth 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 are not limited to the directional magnetic steel sheets. For example, the magnetic plates constituting the upper yoke portion 211 and the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6 may be soft magnetic plates other than the directional magnetic steel plates (for example, non-directional magnetic steel plates). Good. The same applies to the lower yoke portion and the lower teeth portion.

<Modification 5>
In the present embodiment, an example has been described in which the cross section perpendicular to the magnetic path of the magnetic plate blocks 120a to 120l has the same rectangular shape regardless of the location. 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 differ depending on the location. The cross section of the magnetic plate blocks 120a to 120l perpendicular to the magnetic path is not limited to a rectangular shape, and may be, for example, a square or a polygon.

<Modification 6>
In the present embodiment, an example has been described in which the cross section perpendicular to the magnetic path of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 is a rectangular shape having the same size regardless of the location. However, it is not always necessary to do so, and at least one of the shape and size of the cross section of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 perpendicular to the magnetic path differs depending on the location. Is also good. The cross section of the upper teeth portions 212u1 to 212u6, 212w1 to 212w6, and 212v1 to 212v6 perpendicular to the magnetic path is not limited to a rectangular shape, and may be, for example, a square or a polygon. The same 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 specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. Things. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features.

  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 peripheral reinforcing member, 200: stator, 210: upper stator, 211: upper yoke portion, 212u1 to 212u6, 212w1 to 212w6, 212v1 to 212v6: upper tooth portion, 213u1 to 213u6, 213w1 to 213w6, 213v1 to 213v6: upper excitation winding, 214u1, 214u4: upper end surface of the upper tooth portion. 215u1, 215u4: magnetic pole surface, 220: lower stator, 221: lower yoke, 222u7, 222u8: lower teeth, 223u7, 223u8: lower excitation winding, 224u7, 224u8: below the lower teeth. 225u7 225U8: pole faces, 300: rotary shaft

Claims (11)

A rotating electric machine that is a switched reluctance motor or a switched reluctance generator,
Rotor and
And a stator,
The rotor is a plurality of magnetic plate blocks disposed at intervals in a circumferential direction of the rotating electric machine, each having a plurality of magnetic plates having magnetic plates stacked in a plurality of stages in the circumferential direction. Having a body plate block,
The stator includes 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, and each of the two yoke portions has a rotation axis of the rotor. Two yoke portions having a magnetic plate wound so as to be coaxial,
Of the end surfaces of the yoke portion in a direction parallel to the rotation axis of the rotor, a plurality of teeth portions arranged so as to have an interval in the circumferential direction with respect to an end surface closer to the rotor, Has a plurality of teeth having a magnetic plate laminated in a plurality of stages in the circumferential direction,
With the rotation of the rotor, of the end faces of the teeth portion in a direction parallel to the rotation axis of the rotor, an end face closer to the rotor, and the magnetic plate block in a direction parallel to the rotation axis of the rotor. Of the end faces, an end face closer to the stator faces with an interval in a direction parallel to the rotation axis of the rotor,
A rotating electric machine wherein the magnetic plate forming the teeth portion and the magnetic plate forming the yoke portion are electromagnetic steel plates. The magnetic plate constituting the magnetic plate block is a grain-oriented electrical steel sheet,
2. The rotating electric machine according to claim 1, wherein the direction of the axis of easy magnetization of the grain-oriented electromagnetic steel sheet forming the magnetic plate block is a direction parallel to the rotation axis. 3.   The rotating electric machine according to claim 2, wherein a waveform of a magnetic flux excited in the magnetic plate constituting the stator is a rectangular wave. The magnetic plate forming the teeth portion and the magnetic plate forming the yoke portion are directional electromagnetic steel plates,
The direction of the axis of easy magnetization of the grain-oriented electrical steel sheet forming the teeth portion is a direction parallel to the rotation axis,
The rotating electrical machine according to any one of claims 1 to 3, wherein the direction of the axis of easy magnetization of the grain-oriented electrical steel sheet forming the yoke portion is the circumferential direction. The stator has an exciting winding wound around the teeth portion,
The area of the surface of the tooth portion facing the yoke portion and the area of the surface of the tooth portion facing the rotor are perpendicular to the rotation axis of the rotor of the exciting winding wound around the tooth portion. The rotating electric machine according to any one of claims 1 to 4, wherein a cross-sectional area of the rotating electric machine exceeds a cross-sectional area of the rotating electric machine. The rotating electric machine according to any one of claims 1 to 5, wherein the teeth portion and the yoke portion are adhered with a material having an electrically insulating property .   With the rotation of the rotor, of the end surfaces of the teeth portion in a direction parallel to the rotation axis of the rotor, the center of the end surface closer to the rotor is the center in a direction parallel to the rotation axis of the rotor. 2. The end face of the magnetic plate block, which is opposed to the center in the radial direction of the end face closer to the stator with an interval in a direction parallel to the rotation axis of the rotor, 2. The rotating electric machine according to any one of claims 6 to 6.   Of the end surfaces of the plurality of teeth portions in a direction parallel to the rotation axis of the rotor, an end surface closer to the rotor and an end surface of the plurality of magnetic plate blocks in a direction parallel to the rotation axis of the rotor. The rotating electric machine according to any one of claims 1 to 7, wherein a distance between the end face and the end face closer to the stator is the same. The plurality of teeth portions and the plurality of magnetic plate blocks are respectively arranged at equal intervals in the circumferential direction,
The space between the plurality of teeth in the circumferential direction is one-fourth the number of spaces between the plurality of magnetic plate blocks in the circumferential direction, according to any one of claims 1 to 8, wherein The rotating electric machine as described. The number of phases of the rotating machine is three,
The plurality of teeth portions and the plurality of magnetic plate blocks are respectively arranged at equal intervals in the circumferential direction,
The interval between the plurality of teeth in the circumferential direction is two thirds of the interval between the plurality of magnetic plate blocks in the circumferential direction. Rotary electric machine. Further comprising a reinforcing member for suppressing the displacement of the position of the magnetic plate block,
The reinforcing member is closed and portions disposed on the outer circumferential surface of the magnetic plate block and a portion disposed between the magnetic plate block,
A portion disposed on the outer peripheral surface of the magnetic plate block and a portion disposed between the magnetic plate blocks are formed of different materials,
Portion that is disposed between the magnetic plate block, the rotary electric machine according to any one of claims 1 to 10 is composed of a nonmagnetic and nonconductive material, characterized in Rukoto.

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