JP2016077029A - Reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reluctance motor which suppresses vibration and noise and improves durability.SOLUTION: The reluctance motor includes: a hollow cylindrical stator; and a rotor 3 which is disposed in a circumferential direction of a cylindrical rotor body 30 and includes a plurality of second salient pole parts 31 protruding towards the radial outside. The rotor further includes a plurality of tabular connection parts 32 which are formed from a magnetic substance homogenous with the second salient pole parts integrally with the second salient pole parts and connect shoulders 31a of the neighboring second salient pole parts with each other. In the connection part, thickness t3 in a radial direction of a central part 32c in a circumferential direction is less than thickness t4 in the radial direction of a terminal part 32d in the circumferential direction. In the state where the rotor is stopped, a radial outside surface 32a in the connection part is positioned on a virtual circle C1 or radially inside of the virtual circle that is drawn by an outermost circumference of the second salient pole part during rotation of the rotor, on a cross section in an axial view. A size of a gap S2 between the virtual circle and the connection part in the central part of the connection part in the circumferential direction is larger than a size of a gap S2 in the terminal part in the circumferential direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a reluctance motor.

  Conventionally, there is a reluctance motor. For example, Patent Document 1 discloses a reluctance motor having a stator having a plurality of magnetic poles and a rotor in which a plurality of magnetic segments different from the number of magnetic poles of the stator are embedded in a nonmagnetic conductive member. Yes. The reluctance motor of Patent Document 1 is said to be able to suppress vibration and noise.

JP 2006-246571 A

  In a reluctance motor, when a rotor is configured by interposing a member made of a material different from that of a salient pole between salient poles, the relevant member depends on the centrifugal force during rotation or the difference in linear expansion coefficient between the members. The salient poles may be separated and the durability is poor.

  The objective of this invention is providing the reluctance motor excellent in durability while suppressing a vibration and a noise.

  The reluctance motor of the present invention includes a hollow cylindrical stator main body, a plurality of first salient pole portions that are arranged along the circumferential direction of the stator main body and project inward in the radial direction, and the first salient poles. A stator having a coil wound around the salient pole part, a cylindrical rotor body, and a plurality of second salient pole parts that are arranged along the circumferential direction on the rotor body and project outward in the radial direction. And a rotor disposed coaxially with the stator in the hollow portion of the stator, and the rotor is further composed of a magnetic material having the same quality as the second salient pole portion, and It is formed integrally with the second salient pole, connects the shoulders of the adjacent second salient poles, and closes the valley between the one shoulder and the other shoulder. A plurality of plate-like connection portions forming a closed space are provided, and the connection portions are arranged in the circumferential direction. In the state where the radial thickness at the portion is smaller than the radial thickness at the circumferential end and the rotor is stopped, the radially outer surface of the connecting portion is The virtual circle is connected to the virtual circle drawn on the outermost circumference of the second salient pole portion during rotation of the rotor or on the inner side in the radial direction from the virtual circle, and the virtual circle and the connection at the center in the circumferential direction of the connection portion The size of the gap with the portion is larger than the size of the gap at the circumferential end of the connection portion.

  In the reluctance motor, it is preferable that one end of the reluctance motor is connected to the valley portion and the other end is connected to a radially inner surface of the connection portion.

  In the reluctance motor, in at least a part of the connection portion, a radial thickness of the connection portion is equal to or less than a thickness at which magnetic saturation occurs in the connection portion when a current flows through the coil. Is preferred.

  In the reluctance motor according to the present invention, the rotor connects the shoulder portions of the adjacent second salient pole portions and closes the valley portion between one shoulder portion and the other shoulder portion to form a closed space. A plate-like connection portion is provided, and the connection portion is made of a magnetic material having the same quality as the second salient pole portion and is formed integrally with the second salient pole portion. In the connection portion, the radial thickness at the center portion in the circumferential direction is thinner than the radial thickness at the end portion in the circumferential direction. In a state where the rotor is stopped, the radially outer surface of the connection portion is on the virtual circle drawn by the outermost periphery of the second salient pole portion when the rotor rotates in the axial view or on the radially inner side of the virtual circle And the size of the gap between the virtual circle and the connecting portion in the central portion in the circumferential direction of the connecting portion is larger than the size of the gap in the circumferential end portion of the connecting portion. The reluctance motor according to the present invention has the effect of suppressing vibration and noise and being excellent in durability.

FIG. 1 is a cross-sectional view of a reluctance motor according to an embodiment. FIG. 2 is a cross-sectional view of the rotor according to the embodiment. FIG. 3 is a cross-sectional view of a main part of the rotor according to the embodiment. FIG. 4 is a cross-sectional view showing a rotor of a comparative example. FIG. 5 is a diagram for explaining a short circuit of magnetic flux. FIG. 6 is a diagram illustrating the flow of magnetic flux in the rotor of the comparative example. FIG. 7 is a diagram for explaining the deformation of the connecting portion. FIG. 8 is a diagram illustrating an example of the configuration of the connection unit. FIG. 9 is a diagram illustrating the thickness of the connection portion of the embodiment. FIG. 10 is an enlarged view of a main part of a rotor according to a first modification of the embodiment. FIG. 11 is an enlarged view of a main part of a rotor according to a second modification of the embodiment. FIG. 12 is an enlarged view of a main part of a rotor according to a third modification of the embodiment. FIG. 13 is an enlarged view of a main part of a rotor according to a fourth modification of the embodiment.

  Hereinafter, a reluctance motor according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

[Embodiment]
The embodiment will be described with reference to FIGS. 1 to 9. The present embodiment relates to a reluctance motor. FIG. 1 is a cross-sectional view of a reluctance motor according to an embodiment of the present invention.

  A reluctance motor 1 shown in FIG. 1 is a so-called switched reluctance motor. The reluctance motor 1 is mounted on a vehicle as a power source, for example. A reluctance motor 1 according to the embodiment includes a stator 2 and a rotor 3. The stator 2 is fixed so as not to rotate. The stator 2 includes a stator body 20, a plurality of first salient pole portions 21 arranged on the stator body 20 along the circumferential direction, and coils 22 wound around the first salient pole portions 21. The stator body 20 has a hollow cylindrical shape. The first salient pole portion 21 protrudes radially inward from the inner peripheral surface of the stator main body 20. In the present specification, unless otherwise specified, the “axial direction” is the direction of the central axis X of the stator 2 and the rotor 3 (direction perpendicular to the paper surface of FIG. 1), and the “radial direction” is the central axis X. The center is a radial direction perpendicular to the central axis X, and the “circumferential direction” is a direction in which the rotor 3 rotates about the central axis X as a rotation center.

  The plurality of first salient pole portions 21 are arranged at predetermined intervals along the circumferential direction, in this embodiment, at equal intervals. The stator 2 of the present embodiment has 18 first salient pole portions 21. The shape of the first salient pole portion 21 of the present embodiment when viewed in the axial direction is a substantially trapezoidal shape whose width in the circumferential direction becomes smaller toward the inside in the radial direction. The shape of the tip surface of the first salient pole portion 21 when viewed in the axial direction is, for example, an arc shape centered on the central axis X. A coil 22 is wound around each first salient pole portion 21. The reluctance motor 1 is controlled by a control unit that controls the current value and the timing of energizing each coil 22.

  The rotor 3 has a rotor main body 30 and a plurality of second salient pole portions 31 arranged along the circumferential direction in the rotor main body 30, and is arranged coaxially with the stator 2 in a hollow portion of the stator 2. The rotor 3 of the present embodiment is obtained by laminating a plurality of electromagnetic steel plates formed in the same shape along the axial direction. A cylindrical rotor 3 is constituted by laminated electromagnetic steel sheets. The electromagnetic steel sheet is a magnetic material (ferromagnetic material).

  As shown in FIGS. 1 and 2, the rotor main body 30 has a hollow cylindrical shape. In the hollow portion of the rotor body 30, the rotating shaft 4 is fitted so as not to rotate relative to the rotor body 30. The rotating shaft 4 is supported so as to be rotatable with respect to the stator 2. The second salient pole portion 31 protrudes from the outer peripheral surface of the rotor body 30 toward the outside in the radial direction. The second salient pole portions 31 are arranged along the circumferential direction at predetermined intervals, in this embodiment, at equal intervals. The rotor 3 of the present embodiment has twelve second salient pole portions 31. The shape of the second salient pole portion 31 of the present embodiment when viewed in the axial direction is a substantially trapezoidal shape in which the width in the circumferential direction becomes smaller toward the outside in the radial direction. The shape of the distal end surface of the second salient pole portion 31 when viewed in the axial direction is, for example, an arc shape centered on the central axis X.

  In the stator 2, when a current flows through the coil 22 of a certain first salient pole portion 21, the first salient pole portion 21 and the second salient pole portion 31 of the rotor 3 generate magnetic fluxes between the first salient pole portion 21 and the second salient pole portion 31. An attractive force is generated between the pole portion 21 and the second salient pole portion 31. The circumferential component of this suction force is a rotational force that rotates the rotor 3. The reluctance motor 1 has a control unit that controls the energization timing and the energization amount of each coil 22. The controller rotates the rotor 3 by appropriately switching the coil 22 to be energized according to the rotational position of the rotor 3.

  In the reluctance motor 1 of the present embodiment, the rotor 3 further includes a plurality of connection portions 32. As shown in FIG. 2, each connection part 32 has connected the front-end | tip parts of the 2nd salient pole part 31 which mutually adjoins. As shown in FIG. 3, the connection part 32 connects the shoulder parts 31a and 31a of the adjacent 2nd salient pole part 31, and the trough part 40 between one shoulder part 31a and the other shoulder part 31a is connected. It is a plate-like portion that is closed to form a closed space. Here, the valley portion 40 is a concave portion, and includes a side surface 31 b of the second salient pole portion 31 and an outer peripheral surface 30 a of the rotor body 30. The connection part 32 connects the shoulder part 31a of one second salient pole part 31 and the shoulder part 31a of the other second salient pole part 31 in the circumferential direction to form a closed space 41. The second salient pole portion 31 and the connection portion 32 are formed by pressing or wire cutting on each electromagnetic steel plate of the rotor 3. That is, the rotor main body 30, the second salient pole portion 31, and the connection portion 32 are each a part of the same electromagnetic steel plate and are integrally formed. In other words, the connection portion 32 is formed of the same magnetic material as the second salient pole portion 31 and is formed integrally with the second salient pole portion 31. A plurality of electromagnetic steel plates are laminated in the axial direction, and a trough 40 extending in the axial direction and a plate-like connecting portion 32 for closing the trough 40 from the outside in the radial direction are formed.

  The cross-sectional shape orthogonal to the central axis X of the connection part 32 is an arc shape centering on the central axis X in the cross section. That is, the outer peripheral surface 32 a and the inner peripheral surface 32 b of the connection portion 32 are concentric with the central axis X as the center. In the connection part 32 shown in FIG. 3, the thickness t1 of the connection part 32 in the radial direction is uniform along the circumferential direction. In the rotor 3 shown in FIG. 3, the tip surface of the second salient pole portion 31 and the outer peripheral surface 32a of the connection portion 32 are on a common arc.

  In the reluctance motor 1 of the present embodiment, the rotor 3 includes the connection portion 32, so that windage loss and noise are reduced. The effect of the reluctance motor 1 of this embodiment is demonstrated by contrast with a comparative example. The rotor 100 shown in FIG. 4 has the same shape as that of the rotor 3 of the present embodiment, except that the connecting portion 32 is not provided. In the rotor 100 of the comparative example, convex portions (second salient pole portions 31) and concave portions (valley portions 40) are alternately arranged in the circumferential direction. As a result, the rotor 100 disturbs the surrounding air when rotating. As a result, the windage loss tends to become a large value, and vibration noise due to wind noise tends to increase.

  In contrast, in the rotor 3 according to the present embodiment, the tips of the second salient pole portions 31 adjacent to each other are connected by the connection portion 32. The outer shape of the rotor 3 has a cylindrical shape and does not have a recess on the outer peripheral surface. Therefore, the rotor 3 is less likely to disturb the surrounding air when rotating, and has an advantage that the windage loss and noise are small when compared with the rotor 100 of the comparative example. In the rotor 3 of this embodiment, the outer peripheral surface has a circular cross-sectional shape. Therefore, it is possible to minimize windage loss and noise.

  Further, the connection portion 32 of the present embodiment is made of the same magnetic material as the second salient pole portion 31 and is formed integrally with the second salient pole portion 31. When a member made of a material different from the second salient pole portion 31 is interposed between the second salient pole portions 31 as means for suppressing windage and noise, the member is separated from the second salient pole portion 31. There is a fear. On the other hand, since the connection part 32 of this embodiment is integrally formed with the 2nd salient pole part 31, possibility that it will isolate | separate from the 2nd salient pole part 31 is small. The connection portion 32 is made of the same material as the second salient pole portion 31 and has the same thermal deformation characteristics as the second salient pole portion 31. For this reason, when the temperature of the rotor 3 changes, it is suppressed that stress concentration arises and separation of the connection part 32 and the second salient pole part 31 is prevented.

  Moreover, in the reluctance motor 1 of this embodiment, the loss by the short circuit of magnetic flux is suppressed by making the connection part 32 into plate shape so that it may demonstrate below. When the amount of electricity flows through the coil 22 of the stator 2, a magnetic flux fx is generated as shown in FIG. Of the magnetic flux fx, the magnetic flux fx1 penetrating the first salient pole portion 21 and the second salient pole portion 31 generates an attractive force between the first salient pole portion 21 and the second salient pole portion 31. The rotor 3 of the present embodiment has a connection portion 32 made of a magnetic material. Among the generated magnetic fluxes fx, a part of the magnetic flux fx2 flows to the connection part 32 which is a magnetic body, and there is a possibility that a short circuit of the magnetic flux may occur. However, since the connection part 32 is plate-shaped, the magnetic flux The short circuit is suppressed. The cross-sectional area of the connection portion 32 is sufficiently smaller than the cross-sectional area of the second salient pole portion 31. Therefore, the ratio of the magnetic flux fx2 flowing through the connecting portion 32 to the generated magnetic flux fx is sufficiently small. Accordingly, the efficiency of the reluctance motor 1 is not substantially decreased or even if the efficiency is decreased. A closed space 41 surrounded by the connection part 32 and the valley part 40 is an air layer. Therefore, the thickness of the air layer increases as the thickness t1 of the connecting portion 32 decreases, and the efficiency of the reluctance motor 1 is suppressed from decreasing.

  The thickness t1 of the connecting portion 32 is sufficiently thin, for example, the same as the size of the radial gap between the first salient pole portion 21 and the second salient pole portion 31 or thinner than the size of the gap. Therefore, the distribution of the magnetic flux fx when a current flows through the coil 22 is the same as or substantially the same as the distribution of the magnetic flux fx of the comparative example shown in FIG. That is, the degree to which the magnetic flux fx leaks from the first salient pole portion 21 to the connection portion 32 instead of flowing from the first salient pole portion 21 to the rotor body 30 through the second salient pole portion 31 can be ignored. It becomes a little to the extent.

  The thickness t1 (see FIG. 3) of the connection part 32 of the present embodiment is, for example, a predetermined thickness or less. The predetermined thickness is a thickness at which magnetic saturation occurs in the connection portion 32 when a current flows through the coil 22. The predetermined thickness is preferably a thickness at which magnetic saturation always occurs in the connection portion 32 when a current flows through the coil 22 regardless of the magnitude of the current value. The predetermined thickness may be a thickness at which magnetic saturation occurs in the connection portion 32 when the value of the current flowing through the coil 22 is equal to or greater than the predetermined value. Even if the thickness of a part of the connection part 32 exceeds the predetermined thickness, the radial thickness t1 of the connection part 32 is equal to or less than the predetermined thickness in at least a part of the connection part 32. If this is the case, the effect of suppressing the short circuit of the magnetic flux fx by generating magnetic saturation can be expected.

  Moreover, in the reluctance motor 1 of this embodiment, the shape of the connection part 32 is defined so that the connection part 32 and the stator 2 do not contact when the rotor 3 rotates. When the rotor 3 rotates, the connecting portion 32 is deformed outward in the radial direction by centrifugal force. As shown in FIG. 7, the deformed connection portion 321 is positioned on the outer side in the radial direction relative to the connection portion 32 when the rotor 3 is stopped. In FIG. 7, the deformation amount of the connection portion 32 is shown exaggerated from the actual deformation amount. In the deformed connection portion 321, the central portion 322 in the circumferential direction protrudes most outward in the radial direction. In the reluctance motor 1 of the present embodiment, the thickness t1 of the connecting portion 32 is determined in advance so that the deformed connecting portion 321 does not contact the stator 2 at the maximum speed in the speed range used as the rotational speed of the rotor 3. It has been. From the viewpoint of suppressing the deformation amount of the connecting portion 321 during rotation, it is advantageous that the thickness t1 is large. On the other hand, from the viewpoint of reducing the magnetic flux fx2 flowing through the connection portion 32, it is advantageous that the thickness t1 is small. In the present embodiment, the thickness t1 is determined so as to achieve both the deformation suppression of the rotating connection portion 32 and the short-circuit suppression of the magnetic flux fx.

  The thickness t1 of the connection portion 32 may be determined as follows. In the reluctance motor 1 according to the present embodiment, the rotor 3 has the connection portion 32, so that the windage loss is reduced as compared with the case where the rotor 100 of the comparative example is used. On the other hand, the leakage of the magnetic flux fx by the connection part 32 occurs, so that the efficiency is lowered. The thickness t1 of the connecting portion 32 indicates that when the reluctance motor 1 is operated under predetermined operating conditions (output and rotation speed), the increase in efficiency due to the reduction in windage loss is the decrease in efficiency due to leakage of the magnetic flux fx. It may be determined to exceed. The predetermined operating condition is determined, for example, in a commonly used operating region.

  The reluctance motor 1 of the present embodiment described above has an advantage that vibration and noise are suppressed and durability is excellent. The reluctance motor 1 has the connection part 32 which is the same quality as the second salient pole part 31 and is integrally formed, so that members of different materials are interposed between the adjacent second salient pole parts 31 of the rotor 3. Wind noise and vibration can be suppressed without any problems, and the durability is excellent.

  For example, as shown in FIG. 8, the connecting portion 32 is preferably disposed radially inward from a virtual circle C <b> 1 described later. FIG. 8 is a diagram illustrating an example of the configuration of the connection unit. In the rotor 3 shown in FIG. 8, the connection portion 32 is located on the inner side in the radial direction with respect to the virtual circle C <b> 1 in a cross section viewed in the axial direction (cross section orthogonal to the central axis X) in a state where the rotor 3 is stopped. The virtual circle C <b> 1 is a virtual circle drawn by the outermost periphery of the second salient pole portion 31 in a cross section viewed in the axial direction when the rotor 3 rotates. In other words, the virtual circle C <b> 1 is a virtual circle that is centered on the central axis X and touches the outermost periphery of the second salient pole portion 31. As shown in FIG. 8, the connection part 32 is located inside radial direction rather than the virtual circle C1.

  The radial distance S1 between the virtual circle C1 and the outer peripheral surface 32a of the connecting portion 32 when the rotor 3 is stopped can prevent contact between the connecting portion 32 and the stator 2 when the rotor 3 rotates. It is prescribed as follows. That is, when the rotor 3 rotates, a centrifugal force acts on the connection portion 32, and even when the connection portion 32 is bent outward in the radial direction, the stator 2 and the connection portion 32 are not in contact with each other at the time of stopping. Distance S1 is determined.

  In the arrangement of the connection portion 32 shown in FIG. 8, the connection portion 32 can be made thinner than the arrangement of the connection portion 32 shown in FIG. In the rotor 3 shown in FIG. 8, the connection part 32 exists inside radial direction rather than the virtual circle C1 at the time of a stop. Therefore, even if the allowable protrusion amount from the virtual circle C1 toward the outside in the radial direction during rotation of the rotor 3 is the same, the connection portion 32 is made thinner than the connection portion 32 arranged as shown in FIG. Is possible.

  Further, when the arrangement of the connection portions 32 shown in FIG. 8 is used, the radial gap between the first salient pole portion 21 and the second salient pole portion 31 can be reduced. When the thickness t1 of the rotor 3 shown in FIG. 3 and the thickness t2 of the rotor 3 shown in FIG. 8 are set to the same value and the rotor 3 is rotated at the same rotational speed, the connecting portion 32 shown in FIG. Compared with the connection part 32 shown in FIG. 3, it is hard to protrude to the radial direction outer side from the virtual circle C1, and even if it protrudes, the protrusion amount becomes small. Therefore, when the connection portion 32 is arranged as shown in FIG. 8, the first protrusion is prevented while preventing the contact between the connection portion 32 and the stator 2 as compared with the case where the connection portion is arranged as shown in FIG. It is possible to reduce the radial gap between the pole portion 21 and the second salient pole portion 31.

  In the rotor 3 shown in FIG. 8, the entire connection portion 32 is located on the inner side in the radial direction with respect to the virtual circle C <b> 1 when the rotor 3 is stopped, but the present invention is not limited to this. In the cross section viewed in the axial direction with the rotor 3 stopped, it is preferable that at least the central portion 32c in the circumferential direction of the connecting portions 32 is positioned radially inside the virtual circle C1. When the rotor 3 rotates, the amount of deflection toward the outside in the radial direction compared to the position where the rotor 3 is stopped tends to be greatest at the central portion 32c. Therefore, in a state where the rotor 3 is stopped, the contact between the connecting portion 32 and the stator 2 is effectively suppressed by positioning at least the central portion 32c on the inner side in the radial direction than the virtual circle C1.

  In the rotor 3 of the present embodiment, the thickness of the connection portion 32 is further adjusted in advance so that deformation of the connection portion 32 during rotation is suppressed. FIG. 9 is a diagram illustrating the thickness of the connection portion of the embodiment. As shown in FIG. 9, in the rotor 3, when the thickness of the central portion 32c of the connecting portion 32 is smaller than the thickness of both end portions 32d of the connecting portion 32 and the rotor 3 is stopped, the virtual circle C1 and The size of the gap S <b> 2 with the connection portion 32 is large at the central portion.

  As shown in FIG. 9, the radial thickness t3 of the connecting portion 32 at the circumferential central portion 32c is smaller than the radial thickness t4 of the connecting portion 32 at the circumferential end portion 32d. In FIG. 9, the thicknesses t3 and t4 are exaggerated. The thickness of the connection part 32 is gradually reduced from the end part 32d toward the center part 32c. The thickness t4 of the end portion 32d on which large stress acts when the rotor 3 rotates is greater than the thickness t3 of the center portion 32c, so that the connecting portion 32 protrudes radially outward when the rotor 3 rotates. Is reduced.

  In the connection portion 32 of the present embodiment, at least in a cross section viewed in the axial direction with the rotor 3 stopped, the radially outer surface (outer peripheral surface 32a) of the connection portion 32 is on the virtual circle C1 or more than the virtual circle C1. It is located radially inside. Further, the size of the gap S2 between the outer peripheral surface 32a and the virtual circle C1 varies depending on the position in the circumferential direction. The size of the clearance S2 between the virtual circle C1 and the connection portion 32 in the central portion 32c in the circumferential direction of the connection portion 32 is larger than the size of the clearance S2 in the end portion 32d in the circumferential direction of the connection portion 32. In other words, when the outer peripheral surface 32a of the connecting portion 32 is viewed in the axial direction, the central portion 32c is recessed toward the inside in the radial direction from the end portion 32d. Further, at least the central portion 32c is located on the inner side in the radial direction with respect to the virtual circle C1 in a state where the rotor 3 is stopped in a cross section viewed in the axial direction. Accordingly, when the rotor 3 rotates, the central portion 32c of the connecting portion 32 is unlikely to protrude radially outward from the virtual circle C1, and the protrusion amount is suppressed even if it protrudes. Therefore, it is possible to reduce the radial gap between the first salient pole portion 21 and the second salient pole portion 31 while preventing contact between the connection portion 32 and the stator 2. In addition, it is preferable that the magnitude | size of the clearance gap S2 becomes large gradually as it goes to the center part 32c from the edge part 32d of the circumferential direction of the connection part 32. As shown in FIG.

  In addition, the number of the first salient pole portions 21 and the second salient pole portions 31 of the present embodiment is an example. The number of first salient pole portions 21 included in the stator body 20 and the number of second salient pole portions 31 included in the rotor body 30 can be arbitrarily changed.

[First Modification of Embodiment]
A first modification of the embodiment will be described. FIG. 10 is an enlarged view of a main part of a rotor according to a first modification of the embodiment. The rotor 3 of the first modified example is different from the rotor 3 of the above embodiment in that a reinforcing portion 33 is provided.

  One end of the reinforcing portion 33 is connected to the valley portion 40, and the other end is connected to a radially inner surface (inner peripheral surface 32 b) of the connecting portion 32. More specifically, one end of the reinforcing portion 33 is connected to the central portion 30 b on the outer peripheral surface 30 a of the rotor body 30. Here, the central portion 30b is a portion that is equidistant in the circumferential direction from two adjacent second salient pole portions 31 on the outer peripheral surface 30a. The other end of the reinforcing portion 33 is connected to the circumferential central portion 32 c of the connecting portion 32. Accordingly, the reinforcing portion 33 extends along the radial direction and can appropriately suppress the bending of the connecting portion 32 against the centrifugal force when the rotor 3 rotates. The reinforcing portion 33 is formed integrally with the connecting portion 32 and the rotor main body 30. The reinforcing portion 33 is formed by pressing or wire cutting, like the connecting portion 32. The thickness t5 of the reinforcing part 33 is smaller than the thickness t6 of the connection part 32, for example.

  By connecting the connection part 32 and the outer peripheral surface 30a of the rotor main body 30 by the reinforcing part 33, deformation of the connection part 32 toward the radially outer side is suppressed when the rotor 3 rotates. Therefore, the thickness t6 of the connection part 32 can be made thinner than the thickness t1 of the connection part 32 of the above embodiment. Thereby, it is possible to suppress the short circuit by the connection part 32 of the magnetic flux fx.

[Second Modification of Embodiment]
A second modification of the embodiment will be described. FIG. 11 is an enlarged view of a main part of a rotor according to a second modification of the embodiment. The rotor 3 of the second modification has two reinforcing portions 34 for each connection portion 32. One reinforcing portion 34 has one end connected to a corner 42 where one second salient pole portion 31 and the outer peripheral surface 30 a of the rotor body 30 intersect, and the other end connected to a central portion 32 c of the connecting portion 32. It is connected. The other reinforcing portion 34 has one end connected to a corner 43 where the other second salient pole portion 31 and the outer peripheral surface 30a of the rotor body 30 intersect, and the other end connected to the central portion 32c of the connecting portion 32. It is connected. In addition, in the connection part 32, a connection place with the reinforcement part 34 may be parts other than the center part 32c. For example, one reinforcing portion 34 is connected to one side in the circumferential direction from the central portion 32 c in the connecting portion 32, and the other reinforcing portion 34 is connected to the other side in the circumferential direction from the central portion 32 c in the connecting portion 32. May be.

[Third Modification of Embodiment]
A third modification of the embodiment will be described. FIG. 12 is an enlarged view of a main part of a rotor according to a third modification of the embodiment. The rotor 3 of the third modified example has two reinforcing portions 35 for each connection portion 32. One reinforcing portion 35 has one end connected to the side surface 31 b of one second salient pole portion 31 and the other end connected to the central portion 32 c of the connecting portion 32. The other reinforcing portion 35 has one end connected to the side surface 31 b of the other second salient pole portion 31 and the other end connected to the central portion 32 c of the connecting portion 32. The reinforcement parts 35 and 35 are connected to the center part of the radial direction in the side surface 31b, for example. In addition, in the connection part 32, a connection place with the reinforcement part 35 may be parts other than the center part 32c. For example, one reinforcing part 35 is connected to one side in the circumferential direction from the central part 32 c in the connecting part 32, and the other reinforcing part 35 is connected to the other side in the circumferential direction from the central part 32 c in the connecting part 32. May be.

[Fourth Modification of Embodiment]
A fourth modification of the embodiment will be described. FIG. 13 is an enlarged view of a main part of a rotor according to a fourth modification of the embodiment. The rotor 3 of the fourth modified example has two reinforcing portions 36 for each connection portion 32. One reinforcing portion 36 has one end connected to the central portion 30b of the outer peripheral surface 30a of the rotor body 30, and the other end closer to one end portion in the circumferential direction than the central portion 32c of the inner peripheral surface 32b of the connecting portion 32. It is connected to the. One end of the other reinforcing portion 36 is connected to the central portion 30 b of the outer peripheral surface 30 a of the rotor body 30, and the other end is closer to the other end portion in the circumferential direction than the central portion 32 c of the inner peripheral surface 32 b of the connecting portion 32. It is connected to the. In other words, the pair of reinforcing portions 36 has a V-shape in a cross section orthogonal to the axial direction, the V-shaped bent portion is connected to the outer peripheral surface 30a of the rotor body 30, and both ends of the V-shape are It is connected to the inner peripheral surface 32 b of the connecting portion 32.

[Fifth Modification of Embodiment]
In the rotor 3 of the above embodiment, the connection portion 32 is provided continuously from one end to the other end in the axial direction. In other words, all the electromagnetic steel sheets that are laminated to constitute the rotor 3 were provided with the connection portions 32. It replaces with this and the connection part 32 does not need to be provided in the edge part of the axial direction of the rotor 3. FIG. In other words, in the predetermined range in the axial direction including the central portion in the axial direction of the rotor 3, the electromagnetic steel plates having the connection portions 32 may be continuously laminated so that the connection portions 32 have a plate shape. As an example, several continuous electromagnetic steel sheets at the axial end portions (for example, both end portions) of the rotor 3 may not have the connection portion 32. Even in a configuration in which the connection portion 32 is not provided at both ends of the rotor 3, the effect of suppressing vibration and noise can be achieved as in the reluctance motor 1 of the above embodiment.

  The contents disclosed in the above embodiment and each modification can be executed in appropriate combination.

DESCRIPTION OF SYMBOLS 1 Reluctance motor 2 Stator 3 Rotor 20 Stator main body 21 First salient pole part 22 Coil 30 Rotor main body 31 Second salient pole part 31a Shoulder part 31b Side face 32 Connection part 40 Valley part 41 Closed space

Claims (3)

A hollow cylindrical stator body, a plurality of first salient pole portions arranged along the circumferential direction of the stator body and projecting radially inward, and wound around each of the first salient pole portions A stator having a coil;
A cylindrical rotor main body, and a plurality of second salient pole portions that are disposed along the circumferential direction of the rotor main body and project outward in the radial direction, and the stator in the hollow portion of the stator A rotor arranged coaxially;
With
The rotor is made of a magnetic material that is the same quality as the second salient pole part, and is formed integrally with the second salient pole part, and connects the shoulder parts of the adjacent second salient pole parts. And a plurality of plate-like connecting portions that form a closed space by closing a valley portion between the one shoulder portion and the other shoulder portion,
The connecting portion has a radial thickness at a central portion in a circumferential direction that is thinner than a radial thickness at an end portion in the circumferential direction,
In a state where the rotor is stopped, the radially outer surface of the connecting portion is on a virtual circle drawn by the outermost periphery of the second salient pole portion or the virtual circle when the rotor rotates in a cross section viewed in the axial direction. Is located on the inner side in the radial direction, and the size of the gap between the imaginary circle and the connection portion in the central portion in the circumferential direction of the connection portion is the size of the gap in the circumferential end portion of the connection portion. Reluctance motor characterized by being larger than the above. The reluctance motor according to claim 1, further comprising a reinforcing portion having one end connected to the valley portion and the other end connected to a radially inner surface of the connection portion. The thickness in the radial direction of the connection part in at least a part of the connection part is equal to or less than a thickness at which magnetic saturation occurs in the connection part when a current flows through the coil. The reluctance motor described.

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