Reluctance motor

Abstract

To provide a technology for inhibiting deformation of a rotor core of a reluctance motor.SOLUTION: A reluctance motor comprises a rotor core. The rotor core has a plurality of flux barriers, and a plurality of bridges that are provided for at least two of the plurality of flux barriers. The flux barrier is an arc-shaped cavity part that has an arc center near an arc-shaped outer peripheral part of the rotor core. The bridge is provided to cross link the flux barriers. The axis line of the bridge is arranged along a circumferential direction of the center of rotation of the rotor core or a tangential direction thereof. An end of the bridge is arranged near an end of the bridge adjacent to the bridge.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to a reluctance motor having a rotor core.

Background Art

[0002] Reluctance motors having a rotor core have been developed. Some rotor cores of reluctance motors are provided with a plurality of flux barriers. The flux barrier is an arc-shaped cavity. Therefore, in order to suppress a decrease in the mechanical strength of the rotor core, a bridge is partially bridged across the flux barrier. For example, Patent Document 1 discloses a rotor core provided with a plurality of flux barriers. In Patent Document 1, a bridge is formed across the flux barrier. The plurality of flux barriers have a common arc center located in the vicinity of the outer peripheral portion of the rotor core. The axis of the bridge extends toward the arc center of the plurality of flux barriers in order to reduce leakage magnetic flux. Also, adjacent bridges are arranged at positions apart from each other so that their axes are not located on the same straight line.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the reluctance motor described in Patent Document 1, the bridge provided in the flux barrier has its axis extending toward the common arc center of the multiple flux barriers. However, the direction toward the common arc center of the flux barrier is different from the direction of the centrifugal force acting on the rotor core due to the rotation of the rotor core. As a result, in the rotor core of Patent Document 1, stress is partially concentrated near the ends of the bridge. When the bridge is arranged in such a way that stress is concentrated in a part of the bridge, there is a problem that the rotor core deforms.

[0005] This specification discloses techniques for suppressing deformation of the rotor core of a reluctance motor. [Means for solving the problem]

[0006] In a first aspect of the present technology, the reluctance motor is a reluctance motor comprising a rotor core, the rotor core comprising a plurality of flux barriers and a plurality of bridges provided on at least two or more of the plurality of flux barriers. Each of the plurality of flux barriers is an arc-shaped cavity. Each of the plurality of bridges is provided to bridge the flux barriers. Each end of the plurality of bridges is located near the end of an adjacent bridge.

[0007] In this configuration, the bridges are positioned such that their ends are located near the ends of adjacent bridges. That is, adjacent bridges are positioned close together, and all bridges are positioned close together. This arrangement of bridges makes it less likely for stress to concentrate on a part of the bridge, and makes it easier for stress to be applied evenly to the entire bridge. As a result, the rotor core is less likely to deform due to rotation, and the deterioration of the reluctance motor's performance can be suppressed.

[0008] In a second embodiment, in the first embodiment described above, the plurality of bridges may include a first bridge provided on a first flux barrier and a second bridge provided on a second flux barrier located closer to the rotation center than the first flux barrier. The acute angle between the axis of the second bridge and the q-axis passing through the magnetic pole boundary of the rotor core may be smaller than the acute angle between the axis of the first bridge and the q-axis. With this configuration, the closer a bridge is to the rotation center of the rotor core, the smaller the acute angle between it and the q-axis. By arranging the bridges in this way, the orientation of the axis of the bridge becomes closer to the direction of the centrifugal force acting on the rotor core. As a result, stress is less likely to concentrate on a part of the bridge, and deformation of the rotor core can be suppressed more reliably.

[0009] In a third embodiment, in the second embodiment described above, the intersection point of the axis of the first bridge and the axis of the second bridge may be located between the first flux barrier and the second flux barrier. With this configuration, stress is less likely to concentrate on a part of the bridge, and deformation of the rotor core can be suppressed more reliably.

[0010] In a fourth embodiment, in any one of the first to third embodiments described above, the plurality of bridges may include a first bridge provided on a first flux barrier and a second bridge provided on a second flux barrier located on the rotation center side of the first flux barrier. The width of the second bridge may be greater than the width of the first bridge. With this configuration, the bridges located closer to the rotation center of the rotor core have larger widths. By arranging the bridges in this way, deformation of the rotor core can be suppressed more reliably.

[0011] In the fifth embodiment, in any one of the first to fourth embodiments described above, the axis of the bridge provided on the flux barrier located furthest from the center of rotation among the plurality of flux barriers on which the bridge is provided may extend perpendicular to the q-axis passing through the magnetic pole boundary of the rotor core. With this configuration, the orientation of the axis of the bridge becomes close to the direction of the centrifugal force acting on the rotor core. As a result, stress is less likely to concentrate on a part of the bridge, and deformation of the rotor core can be suppressed more reliably.

[0012] In the sixth embodiment, in any one of the first to fifth embodiments described above, the bridge provided on the flux barrier located furthest from the rotation center among the plurality of flux barriers on which the bridge is provided may be positioned on the outer circumference side of the rotor core from a perpendicular line drawn from the intersection of the d-axis passing through the magnetic pole center of the rotor core and the outer circumference of the rotor core to the q-axis passing through the magnetic pole boundary of the rotor core. With this configuration, the bridge provided on the flux barrier located furthest from the rotation center of the rotor core is positioned close to the outer circumference of the rotor core. Furthermore, by positioning the ends of the bridges near the ends of adjacent bridges, all of the bridges are positioned close to each other. Therefore, if the bridge provided furthest from the rotation center of the rotor core is positioned close to the outer circumference of the rotor core, all of the bridges will be positioned close to the outer circumference of the rotor core. By arranging the bridges in this way, stress is less likely to concentrate on a part of the bridge, and deformation of the rotor core can be suppressed more reliably. [Brief explanation of the drawing]

[0013] [Figure 1] A diagram showing a portion (1 / 6 angle region) of the reluctance motor according to the embodiment. [Figure 2] Enlarged view of the main part II in Figure 1. [Figure 3A] This figure shows the stress distribution of the rotor core of the reluctance motor according to this embodiment. [Figure 3B] Enlarged view of the main part B in Figure 3A. [Figure 3C] A diagram showing the amount of deformation of the rotor core included in the reluctance motor according to this embodiment. [Figure 4A] A diagram showing the stress distribution of the rotor core of Comparative Example 1. [Figure 4B] An enlarged view of main part B in FIG. 4A. [Figure 4C] A diagram showing the amount of deformation of the rotor core of Comparative Example 1. [Figure 5A] A diagram showing the stress distribution of the rotor core of Comparative Example 2. [Figure 5B] An enlarged view of main part B in FIG. 5A. [Figure 5C] A diagram showing the amount of deformation of the rotor core of Comparative Example 2. [Figure 6A] A diagram showing the stress distribution of the rotor core of Comparative Example 3. [Figure 6B] An enlarged view of main part B in FIG. 6A. [Figure 7A] A diagram showing the stress distribution of the rotor core of Comparative Example 4. [Figure 7B] An enlarged view of main part B in FIG. 7A.

Embodiments for Carrying Out the Invention

[0014] The reluctance motor 1 of this embodiment will be described with reference to the drawings. FIG. 1 shows a 1 / 6 - cycle angular region of the reluctance motor 1. Each 1 / 6 - cycle angular region has the same structure. The reluctance motor 1 has a six - pole configuration. As shown in FIG. 1, the reluctance motor 1 includes a stator 10 and a rotor core 20.

[0015] The stator 10 is disposed on the outer periphery of the rotor core 20. The stator 10 includes a main body portion 12 and a plurality of teeth 14. The main body portion 12 has an arcuate outer peripheral surface, and the center of the arc of the main body portion 12 coincides with the rotation center O of the rotor core 20. The plurality of teeth 14 are connected to the main body portion 12 and project in the radial direction of the main body portion 12 from the inner peripheral surface of the main body portion 12 toward the rotor core 20. The plurality of teeth 14 are arranged at intervals in the circumferential direction of the main body portion 12. The tip (the end away from the main body portion 12) of each tooth 14 faces the outer peripheral portion of the rotor core 20. A gap is provided between the tip of the tooth 14 and the outer peripheral surface of the rotor core 20. A coil wire (not shown) is wound around each tooth 14. By winding the coil wire around the tooth 14, a coil is formed. When an electric current flows through the coil wire, a magnetic field is generated.

[0016] The rotor core 20 is substantially fan-shaped and is disposed on the inner peripheral side of the stator 10. The rotor core 20 is provided with a plurality of flux barriers 22a to 22f. In this embodiment, the rotor core 20 is provided with six flux barriers 22a to 22f. Hereinafter, the six flux barriers 22a to 22f are described separately as the first flux barrier 22a to the sixth flux barrier 22f in the order from far away from the rotation center O of the rotor core 20. Hereinafter, for other components, when it is necessary to distinguish the components, they are described using alphabetic subscripts, and when it is not necessary to distinguish the components, the alphabetic subscripts may be omitted and they may be simply described by numbers.

[0017] The flux barrier 22 is a roughly arc-shaped cavity. The center of the arc of the flux barrier 22 is located on the outer circumference side of the rotor core 20. The center of the arc of the flux barrier 22 is located on a radial line (a line coinciding with the d-axis in Figure 1) that passes through the rotation center O of the rotor core 20 and equally divides the 1 / 6 angle region of the rotor core 20 into two. The flux barrier 22 becomes larger the closer it is to the rotation center O of the rotor core 20. In this embodiment, the flux barriers 22 increase in size in the order of the first flux barrier 22a to the sixth flux barrier 22f. In the rotor core 20, the flow of magnetic flux is suppressed in the parts where the flux barrier 22 is provided. By providing multiple flux barriers 22, a flow of magnetic flux is formed between adjacent flux barriers 22 in the rotor core 20, and magnetic poles are formed in the rotor core 20. In the following, the line passing through the magnetic pole center of the rotor core 20 will be referred to as the d-axis, and the line passing through the magnetic pole boundary of the rotor core 20 will be referred to as the q-axis. The d-axis coincides with a radial line that passes through the rotation center O of the rotor core 20 and equally divides the 1 / 6 circumference angular region of the rotor core 20 into two parts. The q-axis coincides with the outer circumference (boundary with an adjacent rotor core (not shown)) that extends radially from the rotation center O in the 1 / 6 circumference angular region of the rotor core 20, including the positions of both ends of the arc.

[0018] In this embodiment, six flux barriers 22 are provided on the rotor core 20, but the number of flux barriers 22 provided on the rotor core 20 is not limited to six. The number of flux barriers 22 provided on the rotor core 20 may be less than six or more than six. The number of flux barriers 22 provided on the rotor core 20 can be appropriately selected according to the characteristics of the rotor core 20, such as its shape, material, rotation radius, and number of poles.

[0019] Of the multiple flux barriers 22, bridges 24 and 26 are formed on the flux barrier 22 located on the rotation center O side of the rotor core 20. The bridges 24 and 26 are formed to bridge the flux barrier 22. The bridges 24 and 26 are formed so that their axes extend in a substantially straight line. Since the flux barrier 22 is a hollow part, the mechanical strength of the rotor core 20 decreases when a flux barrier 22 is provided on the rotor core 20. By forming bridges 24 and 26 on the flux barrier 22, the mechanical strength of the rotor core 20 can be improved. Hereinafter, the bridge 24 that is formed along the d axis will be referred to as bridge 24, and the bridge 26 that is formed at a position other than along the d axis will be referred to as bridge 26.

[0020] In this embodiment, the first flux barrier 22a, located furthest from the rotation center O of the rotor core 20, is small, and therefore no bridges 24 and 26 are formed on the first flux barrier 22a. Also, the second flux barrier 22b, adjacent to the first flux barrier 22a, is relatively small, and therefore only bridge 24 is formed on the second flux barrier 22b. On the other hand, the third flux barriers 22c to the sixth flux barriers 22f, located closer to the rotation center O of the rotor core 20 than the second flux barrier 22b, are larger, and therefore bridges 24 and 26 are formed on the third flux barriers 22c to the sixth flux barriers 22f.

[0021] Referring to Figures 1 and 2, the bridges 26 formed at locations other than along the d-axis will be described in more detail. As mentioned above, the bridges 26 are formed in the relatively large third flux barrier 22c to the sixth flux barrier 22f. Hereinafter, the bridges 26 formed in the third flux barrier 22c to the sixth flux barrier 22f will be referred to as the third bridge 26c to the sixth bridge 26f, corresponding to the third flux barrier 22c to the sixth flux barrier 22f.

[0022] The third bridge 26c is formed on the third flux barrier 22c, which is located at the position furthest from the rotation center O of the rotor core 20, among the third to sixth flux barriers 22c to which the bridge 26 is formed. The third bridge 26c is formed such that its axis extends perpendicular to the q-axis. Also, as shown in Figure 1, the third bridge 26c is located on the outer periphery side (right side in Figure 1) of the rotor core 20, relative to the perpendicular line 30 drawn from the intersection point A between the d-axis and the outer periphery of the rotor core 20 to the q-axis. In other words, the third bridge 26c is located close to the arc-shaped outer periphery of the rotor core 20. The position of the third bridge 26c is set so that the stress between the third to sixth flux barriers 22c to 6th flux barriers 22f and the rotor core 20, where the third to sixth bridges 26c to 6th bridges 26f are formed, reaches a target value. The target value is set appropriately according to the characteristics of the rotor core 20, such as its shape, material, rotation radius, and the rotational speed that can be performed.

[0023] The fourth bridge 26d is formed on the fourth flux barrier 22d adjacent to the rotation center O side of the third flux barrier 22c. As shown in Figure 2, the fourth bridge 26d is positioned such that its q-axis side end (lower end in Figure 2) is at the same position as its end furthest from the q-axis (upper end in Figure 2), or slightly closer to the rotation center O of the rotor core 20 than the end furthest from the q-axis. That is, the angle θ3 between the axis of the fourth bridge 26d and the q-axis (more specifically, the acute angle, the angle on the outer circumference side of the rotor core 20) is less than or equal to the angle between the third bridge 26c and the q-axis (i.e., 90 degrees).

[0024] The fifth bridge 26e is formed on the fifth flux barrier 22e adjacent to the rotation center O side of the fourth flux barrier 22d. The angle θ2 between the axis of the fifth bridge 26e and the q-axis (more specifically, the acute angle, the angle on the outer circumference side of the rotor core 20) is smaller than the angle θ3 between the fourth bridge 26d, which is located further from the rotation center O of the rotor core 20 than the fifth bridge 26e, and the q-axis.

[0025] The sixth bridge 26f is formed on the sixth flux barrier 22f adjacent to the rotation center O side of the fifth flux barrier 22e. The angle θ1 between the axis of the sixth bridge 26f and the q-axis (more specifically, the acute angle, the angle on the outer circumference side of the rotor core 20) is smaller than the angle θ2 between the fifth bridge 26e, which is located further from the rotation center O of the rotor core 20 than the fifth bridge 26e, and the q-axis. Thus, the closer the bridge 26 is positioned to the rotation center O of the rotor core 20, the smaller the angle between the bridge 26 and the q-axis becomes, and in this embodiment, θ1 < θ2 < θ3. By forming the bridge 26 in this way, stress concentration on a part of the bridge 26 is suppressed, and stress is applied evenly to the bridge 26.

[0026] Furthermore, the axes of two adjacent bridges 26 intersect between the flux barriers 22 on which the two bridges 26 are formed. For example, in Figure 2, the intersection point B between the axis of the sixth bridge 26f and the axis of the fifth bridge 26e adjacent to the sixth bridge 26f is located between the sixth flux barrier 22f and the fifth flux barrier 22e. Similarly, the intersection point between the axis of the fifth bridge 26e and the axis of the fourth bridge 26d is located between the fifth flux barrier 22e and the fourth flux barrier 22d. By arranging the bridges 26 in this way, the ends of the bridges 26 are positioned near the ends of adjacent bridges 26. Therefore, the bridges 26 are not placed in random positions but are placed in close proximity. As a result, when the axes of multiple bridges 26 are connected, they approximate a curve along the circumferential direction of the rotation center O of the rotor core 20. In other words, the axes of multiple bridges 26 are each arranged along the circumferential direction of the rotation center O of the rotor core 20.

[0027] Furthermore, the width of the bridges 26 is wider on the side of the rotor core 20's rotation center O. Similarly, the width of the bridges 24 is also wider on the side of the rotor core 20's rotation center O. The width of each bridge 24, the width of each bridge 26, and the angle of the axis of each bridge 26 are set appropriately so that the stress on each bridge 24, 26 is less than or equal to a target value. The target value is set appropriately according to the characteristics of the rotor core 20, such as its shape, material, rotation radius, and the rotational speed that can be performed.

[0028] (effect) According to the above configuration, by arranging the bridge 26 along the circumferential direction of the rotation center O of the rotor core 20, the orientation of the axis of the bridge 26 and the direction of deformation due to centrifugal force acting on the rotor core 20 become close. This makes it easier for stress to be applied evenly to the bridge 26 without stress being concentrated on a part of the bridge 26. Therefore, when the rotor core 20 is rotated, it becomes less likely to deform. For example, if the width of the bridge 26 is further increased, the deformation of the rotor core 20 will be suppressed. However, if the width of the bridge 26 becomes too wide, the leakage flux will increase, and the performance of the reluctance motor 1 will deteriorate. In this embodiment, the bridge 26 is arranged so that the orientation of the axis of the bridge 26 and the direction of deformation due to centrifugal force acting on the rotor core 20 are close. By arranging the bridge 26 in this way, the deformation of the rotor core 20 can be suppressed without making the width of the bridge 26 too wide. Therefore, the deformation of the rotor core 20 can be suppressed while reducing the leakage flux, and the deterioration of the performance of the reluctance motor 1 can be suppressed.

[0029] Referring to Figures 3A to 3C, the stress distribution and deformation of the rotor core 20 in this embodiment will be explained. Figures 3A to 3C only show the region between the d-axis and q-axis of the rotor core 20. Figures 3A and 3B show the stress distribution of the rotor core 20. As shown in Figure 3B, in the rotor core 20, the stress was evenly distributed across the bridge 26 on the rotation center O side of the rotor core 20 (see arrow in Figure 3B). The stress on this bridge 26 was approximately 270 MPa. Thus, in the rotor core 20 of this embodiment, by forming the bridge 26 as described above, the concentration of stress on a part of the bridge 26 is suppressed, and the stress on the bridge 26 can be appropriately reduced.

[0030] Furthermore, Figure 3C shows the deformation of the rotor core 20. As shown in Figure 3C, the maximum deformation of the rotor core 20 occurred in the region between the flux barrier 22, which is located furthest from the rotation center O of the rotor core 20, and the outer circumference of the rotor core 20 (the region circled in Figure 3C). Even in the region where the deformation was maximum, the deformation was 54 μm, indicating that the deformation could be kept small. Thus, in the rotor core 20 of this embodiment, by forming the bridge 26 as described above, the concentration of stress in a part of the bridge 26 is suppressed, and the deformation of the rotor core 20 can be reduced. Therefore, a decrease in the performance of the reluctance motor 1 can be suppressed.

[0031] Figures 4A to 4C show the rotor core of Comparative Example 1. As shown in Figure 4A, the rotor core of Comparative Example 1 is provided with a flux barrier of the same shape as in this embodiment, but the arrangement of the bridges is different. Specifically, the axis of the bridges in Comparative Example 1 is located on a straight line extending from a specific point on the d-axis that is on the outer circumference side of the rotor core (for example, the common arc center of multiple flux barriers). Also, the bridges are not arranged on the same straight line as adjacent bridges, but are arranged at a distance from adjacent bridges. As shown in Figure 4B, in the rotor core of Comparative Example 1, stress was concentrated on a part of the bridge on the rotation center side of the rotor core (see the arrow on the left in Figure 4B), and this stress was large, exceeding the yield strength of the material of 400 MPa, to approximately 670 MPa. In addition, a large stress was also applied between the flux barrier and the outer circumference of the rotor core (see the arrow on the right in Figure 4B), causing deformation between the flux barrier and the outer circumference of the rotor core. Furthermore, as shown in Figure 4C, in the rotor core of Comparative Example 1, the maximum deformation occurred in the region between the flux barrier, located furthest from the rotor core's center of rotation, and the outer circumference of the rotor core (see arrow in Figure 4C), and the deformation was large at 75 μm. Thus, in the rotor core of Comparative Example 1, stress was concentrated in a part of the bridge, resulting in a large deformation of the rotor core.

[0032] Figures 5A to 5C show the rotor core of Comparative Example 2. As shown in Figure 5A, the rotor core of Comparative Example 2 is provided with a flux barrier of the same shape as in this embodiment, but the arrangement of the bridges is different. Specifically, in Comparative Example 2, the multiple bridges are arranged so that their axes lie on the same straight line perpendicular to the q-axis. As shown in Figure 5B, in the rotor core of Comparative Example 2, stress was concentrated on a part of the bridge on the rotation center side of the rotor core (see arrow in Figure 5B), and this stress was large, at approximately 360 MPa. Also, as shown in Figure 5C, in the rotor core of Comparative Example 2, the amount of deformation was largest in the region between the flux barrier located furthest from the rotation center of the rotor core and the outer circumference of the rotor core (see arrow in Figure 5C), and the amount of deformation was large, at 63 μm. Thus, in the rotor core of Comparative Example 2 as well, stress was concentrated on a part of the bridge, and the amount of deformation of the rotor core was large.

[0033] Figures 6A and 6B show the rotor core of Comparative Example 3. As shown in Figure 6A, the rotor core of Comparative Example 3 is provided with a flux barrier of the same shape as in this embodiment, but the arrangement of the bridges is different. Specifically, in Comparative Example 3, the multiple bridges are arranged so that their axes lie on the same straight line along the radial direction of the rotor core. As shown in Figure 6B, in the rotor core of Comparative Example 3, stress was concentrated on a part of the bridge on the rotation center side of the rotor core (see arrow in Figure 6B), and this stress was large, exceeding the yield strength of the material of 400 MPa, to approximately 530 MPa. Thus, in the rotor core of Comparative Example 3 as well, stress was concentrated on a part of the bridge.

[0034] Figures 7A and 7B show the rotor core of Comparative Example 4. As shown in Figure 7A, the rotor core of Comparative Example 4 is provided with a flux barrier of the same shape as in this embodiment, but the arrangement of the bridges is different. Specifically, in Comparative Example 4, the multiple bridges are arranged so that their axes lie on the same straight line parallel to the d-axis. As shown in Figure 7B, in the rotor core of Comparative Example 4, stress was concentrated on a part of the bridge on the rotation center O side of the rotor core (see arrow in Figure 7B), and this stress was large, exceeding the yield strength of the material of 400 MPa, to approximately 450 MPa. Thus, in the rotor core of Comparative Example 4 as well, stress was concentrated on a part of the bridge.

[0035] From the above, it was confirmed that in the rotor core 20 of this embodiment, stress concentration in a part of the bridge 26 is suppressed, and the amount of deformation of the rotor core 20 can be reduced. For this reason, the reluctance motor 1 of this embodiment can suppress performance degradation by including the rotor core 20.

[0036] Although specific examples of the present invention have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technologies described in the claims include various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of Symbols]

[0037] 1: Reluctance motor 10: Status 12: Main body 14: Teeth 20: Rotor core 22: Flux Barrier 24, 26: Bridge

Claims

1. A reluctance motor equipped with a rotor core, The rotor core is Multiple flux barriers, The system comprises a plurality of bridges provided in at least two or more of the plurality of flux barriers, Each of the aforementioned flux barriers is an arc-shaped cavity, Each of the aforementioned bridges is provided to bridge the flux barrier, Each end of the multiple bridges is located near the end of an adjacent bridge. The plurality of bridges include a first bridge provided on a first flux barrier and a second bridge provided on a second flux barrier located on the rotational center side of the first flux barrier. A reluctance motor in which the acute angle between the axis of the second bridge and the q-axis passing through the magnetic pole boundary of the rotor core is smaller than the acute angle between the axis of the first bridge and the q-axis.

2. A reluctance motor according to claim 1, A reluctance motor in which the intersection point of the axis of the first bridge and the axis of the second bridge is located between the first flux barrier and the second flux barrier.

3. A reluctance motor according to claim 1, A reluctance motor in which the width of the second bridge is greater than the width of the first bridge.

4. A reluctance motor according to claim 1, A reluctance motor in which, among a plurality of flux barriers on which the bridge is provided, the axis of the bridge provided on the flux barrier located furthest from the center of rotation extends perpendicularly to the q-axis passing through the magnetic pole boundary of the rotor core.

5. A reluctance motor according to any one of claims 1 to 4, A reluctance motor in which, among a plurality of flux barriers on which the bridge is provided, the bridge provided on the flux barrier located furthest from the center of rotation is positioned on the outer circumference side of the rotor core, relative to a perpendicular line drawn from the intersection of the d-axis passing through the magnetic pole center of the rotor core and the outer circumference of the rotor core to the q-axis passing through the magnetic pole boundary of the rotor core.

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