JP2017050918A - Synchronous reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous reluctance motor capable of starting without using an inverter and improving rotation efficiency.SOLUTION: The synchronous reluctance motor includes: a rotor having a magnetic barrier cavity that penetrates an iron core; a plurality of slots that are disposed coaxially through a gap outside the rotor, face the rotor, and are separated in the circumferential direction; a stator having a primary coil provided at the plurality of slots; and a secondary coil provided at the rotor. The secondary coil includes a conductive member disposed by being separated inside from the circumference of the rotor by 5% to 10% of the radius of the rotor.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a synchronous reluctance motor that can be started by a commercial power supply without using an inverter.

  In recent years, reluctance motors that can be started without using an inverter have been developed. This type of motor includes, for example, a secondary coil in which a flux barrier slit (magnetic barrier cavity) provided in a rotor is filled with aluminum and both ends in the axial direction of the filled aluminum are short-circuited.

JP 2003-9484 A JP 2002-199674 A

  The flux barrier slit extends to the outer periphery of the rotor in order to reduce undesired leakage magnetic flux near the outer periphery of the rotor. For this reason, when aluminum is filled in the flux barrier slit, the pulsating magnetic flux according to the pitch of the rotor slots (teeth) interlinks the aluminum portion filled up to the outer periphery of the rotor. Undesirable harmonic current that does not contribute to the flow of the aluminum filling portion. This harmonic current is converted into Joule heat, which reduces the efficiency of the motor.

  Therefore, development of a synchronous reluctance motor that can be started without using an inverter and can improve motor efficiency is desired.

  A synchronous reluctance motor according to an embodiment includes a rotor having a magnetic barrier cavity penetrating an iron core, and a plurality of slots arranged coaxially with a gap outside the rotor and facing the rotor and spaced apart in the circumferential direction. And a stator having a primary coil provided in the plurality of slots, and a secondary coil provided in the rotor. The secondary coil includes a conductive member arranged to be separated from the outer periphery of the rotor by 5% to 10% of the radius of the rotor.

FIG. 1 is a cross-sectional view illustrating a main part of the synchronous reluctance motor according to the first embodiment. FIG. 2 is a side view of the motor of FIG. FIG. 3 is a diagram for explaining the magnetic flux passing through the rotor of the motor of FIG. FIG. 4 is a front view of the end plate of the rotor of the motor of FIG. 1 as viewed from the axial direction. FIG. 5 is a cross-sectional view showing a main part of the synchronous reluctance motor according to the second embodiment. FIG. 6 is a side view of the motor of FIG. FIG. 7 is a front view of the end plate of the rotor of the motor shown in FIG. 5 as viewed from the axial direction.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a main part of a synchronous reluctance motor 100 (hereinafter simply referred to as a motor 100) according to the first embodiment. FIG. 2 is a side view of the motor 100 as viewed from the side. FIG. 1 shows a structure for a central angle of 90 ° obtained by dividing a cross section of the motor 100 along a plane orthogonal to the rotation axis 1 into four equal parts at the q-axis position. That is, the motor 100 of this embodiment has four poles (poles on the q axis) along the circumferential direction, and has a cross-sectional shape obtained by combining the four configurations in FIG.

The motor 100 includes a substantially columnar rotor 10 and a substantially cylindrical stator 20.
The rotor 10 includes a rotating shaft 1, a substantially cylindrical iron core 4 in which a plurality of disk-shaped magnetic members 2 are stacked along the rotating shaft 1, and an iron core 4 from both sides in the stacking direction of the plurality of magnetic members 2. Have two end plates 6 and 8 (a pair of short-circuit members). The iron core 4 and the two end plates 6 and 8 on which a plurality of magnetic members 2 are stacked have center holes 4a, 6a and 8a through which the rotary shaft 1 passes. In other words, the rotating shaft 1 is fixed through the central holes 4a, 6a, 8a of the plurality of magnetic members 2 and the two end plates 6, 8.

  The plurality of magnetic members 2 are, for example, discs of the same size formed of steel. The two end plates 6 and 8 are discs having a diameter smaller than that of the magnetic member 2. The two end plates 6 and 8 are made of a nonmagnetic conductive member such as aluminum, stainless steel, or copper. The two end plates 6 and 8 are fastened in a direction approaching each other by a fastening member (not shown) here, and the plurality of magnetic members 2 are pressed and fixed in the overlapping direction.

  The iron core 4 made up of a plurality of magnetic members 2 is provided with a plurality of flux barrier slits 5 (magnetic barrier cavities) (hereinafter simply referred to as slits 5) penetrating the iron core 4 along the rotation axis 1. Yes. Each of the plurality of slits 5 has a cross-sectional shape curved along the flow of the q-axis magnetic flux passing through the four poles. The plurality of slits 5 are provided in order to form a flow of magnetic flux passing through the iron core 4 as indicated by arrows in FIG. That is, the slit 5 functions as a magnetic barrier that prevents magnetic flux from passing therethrough. Hereinafter, the cross-sectional shape of the plurality of slits 5 will be described.

  Specifically, each slit 5 has an arcuate cross-sectional shape that is axisymmetric about a d-axis between two adjacent q-axes. Both ends in the longitudinal direction of the cross section of each slit 5 are arranged at positions close to the outer periphery of the iron core 4 (that is, the outer periphery 10a of the rotor 10). Four slits 5 a, 5 b, 5 c, and 5 d are provided in the structure corresponding to a central angle of 90 ° of the iron core 4. Of the four slits 5a, 5b, 5c, and 5d, both ends of the slit 5d having the longest arc-shaped cross section are arranged near the q axis, and the curved central portion of the slit 5d protrudes in the direction of the rotation axis 1. That is, the slit 5 d is curved in the direction opposite to the outer periphery 10 a of the rotor 10.

  Both ends of the slit 5c having the long arc-shaped cross section next to the slit 5d are adjacent to the end of the slit 5d on the opposite side to the q axis. The slit 5c is disposed on the opposite side of the rotary shaft 1 with respect to the slit 5d, and a curved central portion protrudes in the direction of the rotary shaft 1. That is, the slit 5c is curved in the same direction as the slit 5d. Similarly, the next long slit 5b is disposed on the opposite side of the rotary shaft 1 with respect to the slit 5c. Similarly, the slit 5a is disposed on the opposite side of the rotary shaft 1 with respect to the slit 5b. In the claims, both ends of the slit 5 close to the outer periphery 10a of the rotor 10 are defined as “end portions”.

  In the present embodiment, four (a total of 16) slits 5a, 5b, 5c, and 5d (hereinafter sometimes collectively referred to as slits 5) are provided for each 90 ° central angle of the iron core 4. The number of slits 5 is not limited to this. Each slit 5 has a cross-sectional shape that is axisymmetric about the d-axis, and is formed in an arc shape that is curved in a direction in which the center protrudes toward the rotating shaft 1. In other words, by making the sectional shape of the slit 5 the shape shown in FIG. 3, the flow of magnetic flux indicated by the arrow can be collected on the q axis.

  A bridge 50 is provided between the “end” of each slit 5 and the outer periphery 10 a of the rotor 10. As a matter of course, the “end” of each slit 5 does not reach the outer periphery 10 a of the rotor 10. The distance between the “end” of each slit 5 and the outer periphery 10 a of the rotor 10, that is, the width of the bridge 50 along the radial direction of the rotor 10 needs to be designed to an appropriate value. Of the magnetic flux passing through the iron core 4, the magnetic flux passing through the bridge 50 becomes a leakage magnetic flux. In order to reduce the leakage magnetic flux, it is desirable to make the width of the bridge 50 as narrow as possible. On the other hand, if the width of the bridge 50 is too narrow, the mechanical strength of the iron core 4 is lowered and sufficient mechanical strength required for the rotor 10 cannot be maintained. That is, there is an appropriate range for the width of the bridge 50.

  Of the four slits 5a, 5b, 5c, and 5d provided at each central angle of 90 °, each of the two slits 5a and 5b that are relatively close to the outer periphery 10a of the rotor 10 has a plurality (in this embodiment, A total of 6 conductive bars 11 (conductive members) are inserted and arranged. The number of conductive bars 11 is not limited to this. The conductive bar 11 of the present embodiment is an elongated plate having a rectangular cross section. Both ends of each conductive bar 11 in the direction along the rotation axis 1 (axial direction) are electrically connected to the end plates 6 and 8 and are fixed and short-circuited. That is, the plurality of conductive bars 11 and the end plates 6 and 8 function as secondary coils.

  FIG. 4 is a front view of the end plate 6 of the rotor 10 as viewed from the axial direction, and shows only a structure corresponding to a central angle of 90 ° in accordance with FIG. That is, the actual shape of the rotor 10 is a shape obtained by combining four structures shown in FIG.

  As shown in FIG. 4, the end plate 6 (8) has a plurality of fixed holes 6 b (8 b) through which the end portions of the plurality of conductive bars 11 can be inserted. Each of the fixing holes 6b and 8b has a shape that substantially matches the cross-sectional shape of the conductive bar 11 to be inserted, and has a size that allows the conductive bar 11 to be inserted. As shown in FIG. 2, the length of each conductive bar 11 is designed to protrude outward in the axial direction beyond the outer surfaces 6 c, 8 c of the end plates 6, 8 opposite to the iron core 4.

  The directions and positions of the fixing holes 6b, 8b provided in the end plates 6, 8 are designed to be directions and positions where the conductive bar 11 is not in contact with the inner walls of the slits 5a, 5b. In addition, the thickness and width of each conductive bar 11 is such that when the motor 100 is driven and the rotor 10 is rotated, the conductive bar 11 is slit 5a even when the conductive bar 11 is bent by centrifugal force. 5b is designed so as not to contact the inner wall. Thus, when the motor 100 is driven and the rotor 10 is rotated, even if the conductive bar 11 vibrates or bends, it is prevented from being in contact with the inner walls of the slits 5a and 5b. In addition, the dimensional accuracy of the conductive bar 11 and / or the slits 5a and 5b can be lowered, and the manufacturing cost of the device can be reduced correspondingly.

  As shown in FIGS. 2 and 4, both ends of each conductive bar 11 in the axial direction are fixed to the outer surfaces 6 c and 8 c of the end plates 6 and 8 by L-shaped metal fittings 12 (fixing tools), respectively. For example, when the end plates 6 and 8 are formed of aluminum, the L-shaped metal fitting 12 is also formed of aluminum. The L-shaped metal fitting 12 is welded to the outer surfaces 6c and 8c of the end plates 6 and 8. Further, the L-shaped metal fitting 12 and the conductive bar 11 are fastened and fixed by screws (not shown).

  As shown in the drawing, the L-shaped metal fitting 12 is preferably arranged on the outer side in the radial direction of the rotor 10 with respect to the conductive bar 11. Thus, by attaching the L-shaped metal fitting 12 to the outside of the conductive bar 11, it is possible to secure the mounting strength of the conductive bar 11 when the centrifugal force due to the rotation of the rotor 10 acts. In this embodiment, the conductive bar 11 is fixed to the end plates 6 and 8 using the L-shaped metal fittings 12, but instead, the ends of the conductive bar 11 are baked into the fixing holes 6 b and 8 b of the end plates 6 and 8. It may be fitted.

  In the present embodiment, since the conductive bar 11 is disposed in the slit 5 that is a magnetic barrier cavity, it is desirable that the conductive bar 11 be formed of a nonmagnetic conductive member that prevents the passage of magnetic flux. Examples of the nonmagnetic conductive member include copper, stainless steel, and aluminum. Further, the conductive bar 11 needs to have rigidity so as not to be bent by the centrifugal force and contact the inner wall of the slit 5 when the rotor 10 is rotated, and the material and thickness thereof are appropriately selected. Furthermore, the conductive bar 11 can also be used as a fixture for fastening and fixing the end plates 6 and 8 to the iron core 4 in combination with the L-shaped metal fitting 12 described above, for example.

  On the other hand, as shown in FIG. 1, the stator 20 includes a substantially cylindrical stator core 21 and an armature winding 22 wound around the stator core 21. The stator core 21 has an inner diameter larger than the diameter of the iron core 4 of the rotor 10 and is coaxial with the outer side of the rotor 10 in a non-contact state between the outer periphery 10a of the rotor 10 and a cylindrical gap S. Placed in. Like the iron core 4 of the rotor 10, the stator iron core 21 has a structure in which a plurality of metal plates having the same shape are laminated in the axial direction.

  A plurality of slots 23 extending in the axial direction are provided on the inner wall 21a of the stator core 21 that is spaced apart from the outer periphery 10a of the rotor 10 and spaced apart at equal intervals in the circumferential direction. By forming the plurality of slots 23, a plurality of teeth 24 extending in the axial direction are formed on the inner wall 21 a of the stator core 21 at regular intervals in the circumferential direction. An armature winding 22 (primary coil) is wound around the plurality of slots 23.

  When driving the motor 100 having the above structure, a three-phase alternating current is passed through the armature winding 22 of the stator 20. As a result, an alternating current whose phase is shifted by 120 ° flows through the armature winding 22, and the magnetic pole generated corresponding to each tooth 24 rotates and moves in the circumferential direction of the stator 20. The conductive bar 11 disposed in the slit 5 of the rotor 10 is in an asynchronous state until the rotor 10 stopped with respect to the stator 20 rotates in synchronization with the rotation of the magnetic poles on the stator 20 side. An induced current flows. That is, in this case, the conductive bar 11 functions as a secondary coil, and generates a starting torque for rotating the rotor 10 with the stator 20.

  In this embodiment, since the conductive bar 11 is disposed in the slit 5 so as to be separated from the “end” of the slit 5 of the rotor 10, the rotor is compared with the case where the conductive bar 11 is disposed at the “end”. Harmonic magnetic flux caused by the throttle nipple generated in the gap S between the stator 10 and the stator 20 is difficult to interlink with the conductive bar 11, and harmonic secondary copper loss is unlikely to occur. For this reason, in the motor 100 of this embodiment, the secondary copper loss at the time of synchronous rotation which synchronizes the rotation of the rotor 10 with the rotation of the magnetic pole on the stator 20 side is 1/10 or less of the primary copper loss, and the efficiency There was almost no drop in the.

  Hereinafter, a preferred layout of the conductive bar 11 will be described. Here, the layout of the two conductive bars 11 arranged near the “end” of the slit 5, not the conductive bar 11 arranged in the center of the slit 5, will be described.

  In order to increase the starting torque of the motor 100, the magnetic flux flowing from the stator 20 needs to be efficiently linked to the conductive bar 11, so that the conductive bar 11 is close to the outer periphery 10a of the rotor 10 close to the stator 20. It is desirable to arrange. Therefore, in this embodiment, the conductive bar 11 is inserted and disposed in the slits 5a and 5b that are relatively close to the stator 20 among the plurality of slits 5a, 5b, 5c, and 5d. However, if the conductive bar 11 is too close to the stator 20, the above-described harmonic magnetic flux is easily linked to the conductive bar 11, and an undesired harmonic current that does not contribute to the rotation of the rotor 10 flows. For this reason, it is desirable that the conductive bar 11 be laid out close to the stator 20 to the last position where it does not interlink with the above-described harmonic magnetic flux.

  Therefore, in the present embodiment, the conductive bar 11 is inserted and disposed in the slits 5a and 5b that are relatively close to the stator 20 among the plurality of slits 5a, 5b, 5c, and 5d, and the “end portions” of the slits 5a and 5b. The conductive bar 11 was disposed slightly apart from the conductive bar 11. The slit for inserting and arranging the conductive bar 11 is not limited to 5a and 5b, but may be 5c or 5d. However, the conductive bar 11 needs to be arranged slightly spaced from the “end” of the slits 5c and 5d. .

  On the other hand, the slit 5 in which the conductive bar 11 is inserted and disposed is a magnetic barrier cavity for controlling the path of the magnetic flux passing through the iron core 4, so that both ends of the slit 5 extend to a position as close as possible to the outer periphery 10 a of the rotor 10. It is desirable. The position as close as possible here is a position where the width of the bridge 50 between the “end” of the slit 5 and the outer periphery 10 a of the rotor 10 is at least larger than the width that can sufficiently secure the mechanical strength of the iron core 4. .

  For this reason, if the conductive bar 11 is arranged at the “end” of the slit 5 so that the conductive bar 11 is as close as possible to the stator 20, the above-described harmonic magnetic flux links with the conductive bar 11, and the motor 100 Harmonic current that does not contribute to rotation flows. Therefore, in this embodiment, the conductive bar 11 is arranged in the slits 5a and 5b so as to be separated from the “ends” of the slits 5a and 5b that are relatively close to the stator 20. In this way, by disposing the conductive bar 11 at least away from the “end” of the slit 5, the harmonic flux is linked to the conductive bar 11 compared to the case where it is arranged at the “end”. Can be suppressed, and a decrease in rotational efficiency can be suppressed.

  On the other hand, as described above, if the conductive bar 11 is too far away from the outer periphery 10a of the rotor 10, the driving force at the start of the motor 100 will be reduced. Therefore, there is an appropriate range for the arrangement position of the conductive bar 11 in the slit 5.

  In this embodiment, when the position of the conductive bar 11 where the efficiency of the motor 100 is the best is examined, the distance between the conductive bar 11 and the outer periphery 10a of the rotor 10 is set to 5% to 10% of the radius of the iron core 4. It has been found that the efficiency is improved. When the distance between the outer periphery 10a of the rotor 10 and the conductive bar 11 is shorter than 5% of the radius of the iron core 4, the above-described harmonic current is likely to flow. The starting torque for rotation is insufficient.

  As described above, according to this embodiment, it is possible to start without using an inverter by adding a simple configuration in which the conductive bar 11 is positioned and arranged in the flux barrier slit 5 of the rotor 10 and both ends are short-circuited. A synchronous reluctance motor that can increase efficiency can be provided.

  The same effect as this embodiment can be obtained by inserting a spacer in the “end” of the slit 5 and filling the remaining portion of the slit 5 with aluminum instead of providing the conductive bar 11 and removing the spacer. Can do. However, as in this embodiment, by using the conductive bar 11, the assembly of the motor 100 can be facilitated and the manufacturing cost can be reduced.

  In addition, according to the present embodiment, the conductive bar 11 and the end plates 6 and 8 can be used as a jig for tightening the iron core 4, and accordingly, the number of parts can be reduced and the manufacturing cost of the apparatus can be reduced. Further, the end plates 6 and 8 can be used as a short-circuit member for the conductive bar 11, and the number of parts can be reduced accordingly.

  Further, according to the present embodiment, since the conductive bar 11 is arranged in a non-contact state with respect to the inner wall of the slit 5, even when the conductive bar 11 vibrates or bends due to the rotation of the motor 100. The conductive bar 11 can be prevented from being in contact with the inner wall of the slit 5 and worn, and the service life of the motor 100 can be extended.

  By the way, the conductive bar 11 disposed at the center of each of the slits 5 a and 5 b is disposed at a position exceeding 10% of the radius of the rotor 10 from the outer periphery 10 a of the rotor 10. That is, the conductive bar 11 is disposed closer to the rotating shaft 1 than at least 5% of the radius of the rotor 10 from the outer periphery 10a of the rotor 10. For this reason, at least the above-described harmonic magnetic flux does not act on the conductive bar 11, and the efficiency of the motor 100 is not lowered by providing the conductive bar 11. On the other hand, the conductive bar 11 in the center does not contribute to the above-described starting torque of the motor 100 at all, and the starting torque can be slightly increased by providing the conductive bar 11. Accordingly, the central conductive bar 11 is not essential for the invention, but may be disposed in the slits 5a and 5b.

  Next, a second embodiment will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a main part of a synchronous reluctance motor 200 (hereinafter simply referred to as the motor 200) according to the second embodiment, FIG. 6 is a side view of the motor 200, and FIG. It is the front view which looked at the end plate 6 of the rotor 10 of 200 from the axial direction.

  5 and 7 correspond to FIG. 1 and FIG. 4, respectively, and show a configuration for a central angle of 90 ° obtained by dividing the actual motor 200 into four equal parts. In the following description, the same reference numerals are given to components that function in the same manner as the motor 100 of the first embodiment described above, and detailed description thereof is omitted.

  The motor 200 of the present embodiment has a structure in which a plurality of conductive bars 31 penetrating the iron core 4 in the axial direction are provided at positions away from the slits 5 instead of disposing the conductive bars 11 in the slits 5.

  In order to insert a plurality of conductive bars 31 through the iron core 4, apart from the slits 5, a plurality of insertion holes 32 (attachment holes) are extended in the axial direction. The conductive bar 31 is preferably formed of a high magnetic permeability material such as iron or permendur. Since the conductive bar 31 of this embodiment is disposed on a path through which the magnetic flux passes, it must be formed of a magnetic conductive member that does not hinder the flow of the magnetic flux. Each conductive bar 31 is inserted and arranged without a gap with respect to the corresponding insertion hole 32.

  The insertion hole 32 functions as a flux barrier in the same manner as the slit 5 in a state where the conductive bar 31 is not received. However, the conductive bar 31 formed by the magnetic conductive member is inserted and disposed in the insertion hole 32 without any gap, so that the conductive bar 31 is integrated with the iron core 4 and the conductive bar 31 does not become a magnetic barrier.

  Both ends in the axial direction of the plurality of conductive bars 31 are connected to the end plates 6 and 8 and are short-circuited. That is, the plurality of conductive bars 31 function as secondary coils together with the end plates 6 and 8. The fixing structure of the end of the conductive bar 31 is the same as that of the first embodiment described above. In FIG. 7, the fixing structure is not shown for clarity.

  As shown in the drawing, the conductive bar 31 can be laid out at any position away from the slit 5, but it is desirable to lay out at a position close to the outer periphery 10 a of the rotor 10 as in the first embodiment. However, it is desirable that the conductive bar 31 of the present embodiment is also spaced inward from the outer periphery 10a of the rotor 10 by a suitable distance that does not allow an undesired harmonic current to flow. Therefore, also in this embodiment, the distance between the outer periphery 10a of the rotor 10 and the conductive bar 31 is set to a distance of 5% to 10% of the radius of the rotor 10.

  As described above, also in the second embodiment, the same effect as in the first embodiment described above can be obtained. That is, also in this embodiment, it is possible to provide a synchronous reluctance motor that can be started without using an inverter and that can increase motor efficiency.

  Also in the present embodiment, an induced current flows through the conductive bar 31 in an asynchronous state where the rotation of the rotor 10 is not synchronized with the rotation of the magnetic pole on the stator 20 side. This induced current generates a short-circuit magnetic flux (magnetic flux linked only to the conductive bar 31) around the conductive bar 31, and magnetically saturates the peripheral portion of the conductive bar 31. This magnetic saturation increases the magnetoresistance of the q-axis magnetic path and decreases the salient pole ratio.

  On the other hand, when the motor is started (when the rotational speed of the rotor is slow relative to the speed of the rotating magnetic field of the stator), a reverse-phase current flows due to the saliency of the rotor, and the rotational speed of the rotor is reduced. At a rotational speed that is 1/2 or more of the synchronous speed, torque is generated in a direction that hinders the starting torque. On the other hand, when the conductive bar 31 is embedded in the iron core 4 as in the present embodiment, the salient pole ratio at the time of starting becomes small, so that the reverse phase current is relaxed and the reduction in starting torque is suppressed. During synchronous operation, almost no current flows through the conductive bar 31, so the salient pole ratio does not decrease and the characteristics (torque and power factor) do not decrease. If the distance between the outer periphery 10a of the rotor 10 and the conductive bar 31 is 5% or more of the radius of the iron core 4, almost no harmonic loss occurs and the motor efficiency does not decrease.

  That is, according to the present embodiment, the reverse-phase current due to the salient pole ratio at the time of starting can be reduced, and a decrease in the starting torque of the motor 200 can be suppressed.

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, by combining the first and second embodiments described above, the conductive bar 11 may be provided in the slit 5 and the conductive bar 31 penetrating the iron core 4 may be provided. In any case, the conductive bars 11 and 31 need to be disposed at a position away from the outer periphery 10a of the rotor 10 by a predetermined distance (5% to 10% of the radius of the rotor 10).

  DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Magnetic member, 4 ... Iron core 5, 5a, 5b, 5c, 5d ... Flux barrier slit, 6, 8 ... End plate, 6b, 8b ... Fixed hole, 10 ... Rotor, 11, 31 DESCRIPTION OF SYMBOLS ... Conductive bar, 12 ... L-shaped metal fitting, 20 ... Stator, 21 ... Stator iron core, 22 ... Armature winding, 23 ... Slot, 24 ... Teeth, 32 ... Insertion hole, 50 ... Bridge, 100, 200 ... Synchronous Reluctance motor.

Claims (5)

A rotor having a magnetic barrier cavity penetrating a cylindrical iron core in the axial direction;
A stator having a plurality of slots arranged coaxially with a gap on the outside of the rotor, facing the rotor and spaced apart in the circumferential direction, and a primary coil provided in the plurality of slots,
A secondary coil including a conductive member arranged to be separated from the outer periphery of the rotor by 5% to 10% of the radius of the rotor;
Synchronous reluctance motor. The conductive member includes a non-magnetic conductive bar disposed in the magnetic barrier cavity spaced from an end of the magnetic barrier cavity close to the outer periphery of the rotor;
The synchronous reluctance motor according to claim 1. The iron core has a structure in which a plurality of magnetic members are stacked in the axial direction,
A pair of short-circuit members that are arranged to face both axial ends of the iron core, fix the plurality of magnetic members sandwiched in the axial direction, and fix and short-circuit the axial ends of the conductive bar. In addition,
The synchronous reluctance motor according to claim 2. It further includes a fixture that is disposed on the outer side of the iron core in the radial direction with respect to the conductive bar, and fixes the conductive bar to the short-circuit member.
The synchronous reluctance motor according to claim 3. In addition to the magnetic barrier cavity, it further has a mounting hole penetrating the iron core in the axial direction,
The conductive member includes a magnetic conductive member disposed in the mounting hole.
The synchronous reluctance motor according to claim 1 or 2.