JP2006121765A - Reluctance rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve power factor of a reluctance rotary electric machine self-starting with a commercial power supply. <P>SOLUTION: In the reluctance rotary electric machine where a plurality of flux barrier slits are formed in the rotor core, a plurality of slots are formed in the vicinity of outer circumference of the core, at least a secondary conductor is set in the slot, a reluctance torque is generated by the flux barrier slits and rotation is started through induction between the slot and the secondary conductor, permanent magnets 31 and 32 are arranged at a part of the flux barrier slits 11 and 12, and cuts 54 and 55 are made in thin coupling portions 52 and 53 located between the flux barrier slits 11, 12 and the outer circumference of the core 2 so that circumferential direction of the core 2 is magnetically separated in the lateral direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine that uses reluctance torque, and more particularly to a reluctance rotating electrical machine that can be self-started by a commercial power source.

  FIG. 10 is a perspective view of a rotor of a conventional reluctance rotary electric machine, and FIG. 11 is a cross-sectional view of the core of the rotor.

  In this example, the reluctance type rotating electric machine includes a quadrupole rotor 1. The rotor 1 includes a core 2, short-circuit rings 3 a and 3 b formed at both ends of the core 2, and a shaft 4. The core 2 is formed by laminating a large number of substantially disk-shaped core forming punching plates 5 formed by punching from a thin electromagnetic steel sheet or the like in the axial direction.

  Each core-forming punching plate 5 is formed with two flux barrier slits 11 and 12 and five slots 21 to 25 in each of the regions divided into four in the circumferential direction of the core 2. A through hole 6 through which the shaft 4 is inserted is formed in the part.

  The flux barrier slits 11 and 12 have a cross-sectional circle so as to protrude from the vicinity of the outer periphery of the core forming punching plate 5 toward the center so as to cause a magnetic resistance (reluctance) difference with the rotational position of the core 2. It is formed in an arc shape. The slots 21 to 25 are formed along the circumferential direction in the vicinity of the outer peripheral portion of the core forming punching plate 5. The flux barrier slits 11 and 12 and the slots 21 to 25 are both filled with a nonmagnetic conductive material 7, such as aluminum or copper. The short-circuit rings 3a and 3b formed at both ends of the core 2 are also made of the same conductive material 7, and the conductive material 7 and the short-circuit rings filled in the flux barrier slits 11 and 12 and the slots 21 to 25 are used. 3a and 3b are integrally connected to form a secondary conductor 8.

  In order to manufacture the rotor 1 having this configuration, a plurality of core forming punching plates 5 in which the flux barrier slits 11 and 12 and the slots 21 to 25 are formed in advance by punching or the like are prepared, and these cores are formed. The punching plate 5 is laminated in the axial direction of the rotor 1 to form the core 2.

  Next, using a die casting method, the conductive material 7 is cast into the flux barrier slits 11 and 12 and the slots 21 to 25 of the core 2, and the short-circuit rings 3 a and 3 b are integrally formed at both ends of the core 2. A secondary conductor 8 is formed. Then, after die casting, the outer diameter of the rotor 1 is processed into a perfect circle by cutting or grinding, and then the shaft 4 is inserted into the through hole 6.

  In the reluctance type rotating electric machine having this configuration, magnetic saliency is imparted along the circumferential direction by the flux barrier slits 11 and 12 serving as magnetic flux barriers. Therefore, the reluctance (magnetic resistance) according to the rotational position of the rotor 1 is provided. Changes to generate reluctance torque. Further, since the rotation can be started mainly by the induction action of the slots 21 to 25 and the secondary conductor 8, there is no need to provide a dedicated control device for starting the rotation, and the reluctance type rotating electrical machine itself has a starting function. Since there is no need to provide, there is an advantage that it can be manufactured at a low cost with a simple structure.

By the way, in the reluctance type rotating electrical machine of this configuration, as shown in FIG. 11, when the central axis of the magnetic pole in the rotor 1 is the q axis and the central axis between the magnetic poles in the rotor is the d axis, the reluctance torque Tr is Like a general AC machine, it can be expressed in dq coordinate format and is given by the following equation.
Tr = (Pn / 2) · (Ld−Lq) · Ia ² · sin (2β) (1)
here,
Pn: Number of pole pairs Ld: d-axis inductance (inductance at the magnetic pole center)
Lq: q-axis inductance (inductance between magnetic poles)
Ia: Armature current,
β: Lead angle of current vector from q-axis

  As can be seen from the equation (1), the reluctance type rotating electrical machine generates reluctance torque Tr by inductances Ld and Lq, and the reluctance torque Tr in this case is expressed as d-axis inductance Ld representing the ease of passing the d-axis magnetic flux. , Which is proportional to the difference from the q-axis inductance Lq representing the ease of passing the q-axis magnetic flux.

JP2003-259615A (FIGS. 2 and 3)

  By the way, in the reluctance type rotating electrical machine having the above-described conventional configuration, there are still problems that the power factor is still low from the viewpoint of electrical equipment and that the manufacture is difficult from the viewpoint of manufacturing.

First, the problem that the power factor is low from the viewpoint of electrical equipment will be described. The relationship between the voltage and current of the reluctance type rotating electrical machine is given by the following equation on the dq axis coordinates.
Vd = Ra · Id−ω · Lq · Iq
Vq = ω · Ld · Id + Ra · Iq (2)
here,
ω: electrical angular frequency Vd: d-axis direction component of voltage Vq: q-axis direction component of voltage Id: d-axis direction component of current Iq: q-axis direction component of current Ra: armature resistance

  FIG. 12 is a vector diagram of dq coordinate axes of current and voltage during operation. When the angle formed by both the current and voltage vectors is φ, the power factor is expressed as cos (φ). In the reluctance rotating electrical machine, Lq> Ld and (Ld−Lq) <0 in the way of taking the d-axis and the q-axis as shown in FIG. Therefore, in order to obtain the positive reluctance torque Tr in the equation (1), the current needs to be Iq> 0 and Id <0. At this time, in the equation (2), Vd <0 and Vq <0. As a result, in the current and voltage vector diagrams shown in FIG. 12, the current and voltage quadrants are different, so that the angle φ increases and the power factor generally decreases.

In equation (2), if the value of the armature resistance Ra is increased, the q-axis direction component Vq of the voltage can be made Vq> 0, so that it is possible to improve the power factor. The copper loss (= Ra · I ² ), which is one of the above, increases, and the motor efficiency significantly decreases. For this reason, the value of the armature resistance Ra cannot be increased without any restriction, and there is a limitation in improving the power factor.

  Next, manufacturing problems will be described. When the secondary conductor 8 is formed by the die casting method, molten metal forging may be performed so that the conductive material 7 is reliably injected into the flux barrier slits 11 and 12 and the slots 21 to 25. At that time, the slot 23 in the position where the d-axis passes is particularly large in diameter and the connecting portion 51 between the outer periphery of the core forming punching plate 5 is thin. The part 51 easily swells to the outer peripheral side. Then, when the expansion amount of the connecting portion 51 is large, the connecting portion 51 as a whole is cut when the outer diameter of the core 2 is cut thereafter, and the conductive material 7 in the slot 23 cannot be held.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reluctance type rotating electrical machine having a power factor improved further than before. Furthermore, it aims at obtaining the reluctance type rotary electric machine which can be manufactured more easily than before.

  The present invention provides a rotor core having a plurality of flux barrier slits and cores formed so as to protrude from the vicinity of the outer periphery of the core toward the center of the core so as to produce a magnetic resistance difference according to the rotational position of the core. A plurality of slots arranged in the vicinity of the outer peripheral portion and along the circumferential direction are formed together, a secondary conductor is incorporated in at least the slot, and reluctance torque is generated by the flux barrier slit. A reluctance type rotating electrical machine that starts rotation by an induction action of a slot and a secondary conductor employs the following configuration.

  That is, in the reluctance type rotating electrical machine according to the present invention, a magnet is attached to a part of the flux barrier slit, and the connecting portion located between the flux barrier slit and the outer periphery of the core has magnetic nonmagnetic characteristics. It is configured as described above.

  According to the present invention, a permanent magnet is attached to a part of the flux barrier slit, and the connecting portion between the flux barrier slit and the outer periphery of the core is configured to be magnetically non-magnetic and magnetically By separating the magnetic flux, the magnetic flux is sufficiently interlinked with the stator side, so that the armature interlinkage magnetic flux increases as a whole, and the power factor can be greatly improved as compared with the conventional case.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of a core for constituting a rotor of a quadrupole machine in the reluctance type rotating electric machine according to Embodiment 1 of the present invention, and corresponds to the prior art shown in FIGS. Are given the same reference numerals.

  In FIG. 1, reference numeral 2 denotes a core constituting a rotor 1 having magnetic saliency. The core 2 is formed by laminating a large number of substantially disk-shaped core forming punching plates 5 formed by punching from a thin electromagnetic steel plate or the like in the axial direction.

  Each core forming punching plate 5 is provided with two flux barrier slits 11 and 12 and five slots 21 to 25 in each region divided into four in the circumferential direction of the core 2, and will be described later. An expansion absorption hole 29 is formed adjacent to one slot 23 located on the d-axis. A through hole 6 through which a shaft (not shown) is inserted is formed at the center of the core forming punching plate 5.

  The flux barrier slits 11 and 12 are for forming a magnetic resistance difference according to the rotational position of the core 2, and are formed on the left and right sides of the magnet mounting holes 11a and 12a each having a rectangular cross section for mounting a permanent magnet. The conductive material holding holes 11b, 11c, 12b and 12c having an arcuate cross section are formed independently of each other, and these holes 11a, 11b and 11c and 12a, 12b and 12c are formed as a whole for core formation. The punching plate 5 is formed so as to project in a substantially arc shape from the vicinity of the outer peripheral portion toward the center.

  And permanent magnets 31 and 32 are mounted in the magnet mounting holes 11a and 12a, respectively. In this case, the permanent magnets 31 and 32 are arranged so that the polarity thereof is, for example, SNSN or conversely NSNS from the inner side to the outer side in the radial direction. The conductive material holding holes 11b, 11c, 12b, and 12c are filled with a nonmagnetic conductive material 7, such as aluminum or copper.

  Furthermore, in this Embodiment 1, the thin connection parts 52 and 53 located between the electrically conductive material holding holes 11b, 11c, 12b and 12c of the flux barrier slits 11 and 12 and the outer periphery of the core forming punching plate 5 are used. Are cut out to form cut portions 54 and 55. The cut-out portions 54 and 55 constitute the thin connecting portions 52 and 53 so as to have magnetic nonmagnetic properties.

  The slots 21 to 25 are formed in the vicinity of the outer peripheral portion of the core forming punching plate 5 and along the circumferential direction. The slots 21 to 25 are filled with a nonmagnetic conductive material 7, for example, aluminum or copper.

  Further, in the first embodiment, the expansion absorbing hole 29 is formed in the connecting portion 51 between the slot 23 having a crescent cross section passing on the d-axis and the outer periphery of the core forming punching plate 5. In this case, the inside of the expansion absorption hole 29 is filled with a simple cavity or a nonmagnetic, nonconductive, and freely deformable material, for example, a resin that can be deformed greatly.

  The conductive material holding holes 11b, 11c, 12b, 12c of the flux barrier slits 11, 12 and the conductive material 7 filled in the slots 21 to 25, respectively, and short-circuit rings (not shown) provided at both ends of the core 2 Are integrally connected to form a secondary conductor.

Here, the voltage equation when the permanent magnets 31 and 32 are mounted in the magnet mounting holes 11a and 12a of the flux barrier slits 11 and 12 includes the term of the permanent magnets 31 and 32, and the above-described (2 ) Expression is transformed into the following expression (3).
Vd = Ra · Id−ω · Lq · Iq
Vq = ω · Ld · Id + Ra · Iq + ω · Φa (3)
Here, Φa is an armature interlinkage magnetic flux by the permanent magnets 31 and 32.

The torque of the motor when the permanent magnets 31 and 32 are installed also includes the term of the permanent magnets 31 and 32.
Tr + Tm = Tr + Pn · Φa · Iq (4)
It becomes.

  As can be seen from the equation (3), by attaching the permanent magnets 31 and 32, the q-axis direction component Vq of the voltage includes the term ω · Φd. Since the term of ω · Φd takes a positive value, the q-axis direction component Vq of the voltage can be set to Vq> 0. The relationship between current and voltage on the dq coordinate axis in this case is shown in the vector diagram of FIG.

  As described above, in order to obtain the positive reluctance torque Tr, the current needs to be Iq> 0 and Id <0. At this time, since Vd <0 and Vq> 0 in the expression (3), as can be seen from the vector diagram of FIG. 2, both the current and voltage vectors are in the same quadrant. Therefore, the angle φ can be reduced and the power factor can be increased.

  By the way, in order to maintain a high power factor when the permanent magnets 31 and 32 are attached to a part of the flux barrier slits 11 and 12, the conductive material holding holes 11b, 11c, 12b, and 12c of the flux barrier slits 11 and 12 and Existence of the cut portions 54 and 55 provided in the thin connection portions 52 and 53 between the outer periphery of the core forming punching plate 5 is important.

  That is, as shown in FIG. 3A, when notch holes are provided between the conductive material holding holes 11b, 11c, 12b, and 12c and the connecting portions 52 and 53 on the outer periphery of the core forming punching plate 5. As shown by the arrows in the figure, a part of the magnetic flux of the permanent magnets 31 and 32 returns through the connecting portions 52 and 53, and is not sufficiently linked to the stator side (not shown). That is, since the armature linkage magnetic flux Φa in the above formulas (3) and (4) becomes small, the power factor improvement efficiency decreases, and the torque Tm generated by the permanent magnets 31 and 32 also becomes small. .

  On the other hand, as in the first embodiment (shown in FIG. 3B), the conductive material holding holes 11b, 11c, 12b, and 12c of the flux barrier slits 11 and 12 and the core forming punched plate 5 are formed. When the cut portions 54 and 55 are formed in the connecting portions 52 and 53 between the outer circumferences, the portions are magnetically separated. Therefore, as shown by the arrows in the figure, leakage of magnetic flux at the connecting portions 52 and 53 occurs. As a result, the magnetic flux sufficiently interlinks with the stator side, and the armature interlinkage magnetic flux Φa increases, greatly contributing to power factor improvement.

  In this case, when the circumferential width of the cut portions 54 and 55 is shorter than the gap length that is the gap between the rotor 1 and the stator (not shown), a part of the magnetic flux flows over the cut portions 54 and 55. The significance of providing the cut sections 54 and 55 is lost. Therefore, it is desirable that the width of the cut portions 54 and 55 is set to be twice or more the gap length. Moreover, by providing such cut portions 54 and 55, it is possible to prevent expansion to the outer peripheral portion of the core 2 when the conductive material holding holes 11b, 11c, 12b and 12c are filled with the conductive material.

  In the first embodiment, the left and right slots 22 and 24 have the same shape with the crescent-shaped slot 23 passing through the d-axis as the center, and the outer slots 21 and 25 have the same shape. However, the slots 22 and 24 and the slots 21 and 25 are not the same shape. By setting the slot shape in this way, the magnetic path width of the magnetic path including each slot can be optimized without impairing the self-starting characteristics, and the q-axis inductance Lq can be increased. As a result, the difference (Ld−Lq) between the d-axis inductance Ld and the q-axis inductance Lq increases, and the reluctance torque Tr increases. As a result, the output torque at the same current increases, in other words, the current required to output the same torque can be reduced, so that the motor efficiency is improved. The slots 21 to 25 may have different shapes.

  Next, in order to manufacture the rotor 1 according to the first embodiment, the flux barrier slits 11 and 12, the slots 21 to 25, the expansion absorption hole 29, and the cut portions 54 and 55 are formed in advance by punching or the like. A predetermined number of core forming punching plates 5 are prepared. Then, after the core forming punching plates 5 are laminated in the axial direction of the rotor 1 to form the core 2, the permanent magnets 31 and 32 are mounted in the magnet mounting holes 11a and 12a.

  Subsequently, the conductive material 7 is cast into the conductive material holding holes 11b, 11c, 12b, 12c of the flux barrier slits 11 and 12 of the core 2 and the slots 21 to 25 using the die casting method, and both ends of the core 2 are A secondary conductor is formed by integrally forming a short ring (not shown). At that time, the conductive material 7 is prevented from entering the expansion absorption hole 29.

  Then, after die casting, the outer diameter of the rotor 1 is processed into a perfect circle by cutting or grinding. The expansion absorption hole 29 is left hollow after die casting, or is filled with, for example, a resin that is nonmagnetic, nonconductive, and can be freely deformed, if necessary.

  Here, when the die casting method is applied, molten metal forging may be performed so that the conductive material 7 is surely injected into the conductive material holding holes 11b, 11c, 12b, 12c and the slots 21 to 25. At that time, particularly when the conductive material 7 is injected into the slot 23 passing on the d-axis, a large forging pressure may be applied to expand the slot 23 to the outer peripheral side. However, in the first embodiment, as shown in FIG. 4, since the expansion absorbing hole 29 is formed in the connecting portion 51 between the slot 23 and the outer periphery of the core forming punching plate 5, the slot 23 is formed on the outer periphery. Even if it expands to the side, the expansion can be absorbed by the expansion absorption hole 29. For this reason, the portion on the outer peripheral side of the expansion absorption hole 29 does not further expand toward the outer peripheral side of the core. Therefore, after die-casting, the outer diameter of the rotor 1 can be processed into a perfect circle without any problem when cutting or grinding, and there is a problem that the conductive material 7 in the slot 23 cannot be held as in the prior art. Does not occur. Further, since the inside of the expansion absorption hole 29 remains hollow or is filled with a non-magnetic and non-conductive material, no secondary copper loss occurs, so the loss is reduced and the motor efficiency is improved.

  In the first embodiment, the magnet mounting holes 11a, 12a constituting the flux barrier slits 11, 12 and the conductive material holding holes 11b, 11c, 12b, 12c on both sides thereof are formed separately from each other. Therefore, even if the conductive material 7 is cast into the conductive material holding holes 11b, 11c, 12b, 12c after the permanent magnets 31, 32 are mounted in the magnet mounting holes 11a, 12a, the permanent magnets 31, It is possible to reliably prevent the 32 characteristics from changing. The permanent magnets 31 and 32 can be mounted in the magnet mounting holes 11a and 12a after die casting. In this case, the thermal influence can be further reliably reduced.

  In the first embodiment, the total number of the flux barrier slits 11 and 12, the slots 21 to 25, and the expansion absorption hole 29 along the circumferential direction is approximately 44 (in this case, 2 for each slot 23). Counting as a piece). In the reluctance type rotating electric machine with four poles as shown in the first embodiment, the number of slots of the stator is often 36 when the motor output is small. As shown in the example, if there are approximately 44, it is convenient because the torque ripple can be reduced.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view of the core constituting the rotor of the reluctance type rotating electric machine according to the second embodiment of the present invention, and the same reference numerals are given to the components corresponding to those in the first embodiment shown in FIGS. Is attached.

  The feature of the second embodiment is that the expansion absorbing hole 29 as in the first embodiment is formed at the connecting portion located between the slot 23 having a crescent cross section passing on the d-axis and the outer periphery of the core forming punching plate 5. In this case, the outer peripheral portion of the core forming punching plate 5 is cut out in an arc shape along the shape of the slot 23 to form the cutout portion 57.

  According to this configuration, when the conductive material 7 is injected into the slot 23 by applying the die casting method, even if a large forging pressure is applied and the slot 23 expands to the outer peripheral side, the presence of the notch portion 57 causes the outer periphery of the core to Since the outer diameter of the rotor 1 does not expand to the outside, the outer diameter of the rotor 1 can be processed into a perfect circle without any problem when the outer diameter of the rotor 1 is cut after die casting.

In addition, since the gap length, which is the gap between the rotor and the stator, is locally increased with respect to the cutout portion 57 and the reluctance (magnetic resistance) is also increased, the d-axis inductance Ld is decreased, and as a result, the d-axis The difference (Ld−Lq) between the inductance and the q-axis inductance is increased, and the reluctance torque Tr is increased. Therefore, the output torque at the same current increases, in other words, the current required to output the same torque can be reduced, so that the motor efficiency is improved.
Since other configurations and operational effects are the same as those in the first embodiment, detailed description thereof is omitted here.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view of the core constituting the rotor of the reluctance type rotating electric machine according to the third embodiment of the present invention, and the same reference numerals are given to the components corresponding to those in the first embodiment shown in FIGS. Is attached.

  The feature of this third embodiment is that the magnet mounting holes 11a, 12a constituting the flux barrier slits 11, 12 have an arc shape instead of a rectangular shape. Accordingly, the shapes of the permanent magnets 31 and 32 mounted in the magnet mounting holes 11a and 12a are also arcuate.

When the cross-sectional shapes of the magnet mounting holes 11a and 12a and the permanent magnets 31 and 32 constituting the flux barriers 11 and 12 are both arcuate as in the third embodiment, the shape follows the flow of the magnetic flux. Therefore, the q-axis inductance Lq increases. Therefore, the difference (Ld−Lq) between the d-axis inductance and the q-axis inductance is increased, and the reluctance torque Tr is increased. As a result, the output torque with the same current is increased, in other words, the current required to output the same torque can be reduced, so that the motor efficiency can be further improved as compared with the first and second embodiments.
Since other configurations and operational effects are the same as those in the first embodiment, detailed description thereof is omitted here.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view of the core constituting the rotor of the reluctance type rotating electric machine according to the fourth embodiment of the present invention, and the same reference numerals are given to the components corresponding to those in the first embodiment shown in FIGS. Is attached.

  The feature of the fourth embodiment is that the magnet mounting holes 11a and 12a constituting the flux barrier slits 11 and 12 have the same cross-sectional rectangular shape, and accordingly the magnet mounting holes 11a and 12a are mounted in the magnet mounting holes 11a and 12a. The permanent magnets 31 and 32 used have the same shape and size.

According to the configuration of the fourth embodiment, the permanent magnets 31 and 32 can all have the same shape and size, so that there is an advantage that the manufacturing cost of the permanent magnets 31 and 32 can be reduced.
Since other configurations and operational effects are the same as those in the first embodiment, detailed description thereof is omitted here.

Embodiment 5. FIG.
FIG. 8 is a cross-sectional view of the core constituting the rotor of the reluctance type rotating electric machine according to the fifth embodiment of the present invention, and components corresponding to those in the first embodiment shown in FIGS. Is attached.

  The feature of the fifth embodiment is that thin connection portions 52, 53 between the conductive material holding holes 11b, 11c, 12b, 12c of the flux barrier slits 11, 12 and the outer periphery of the core forming punching plate 5 As shown in FIG. 8, instead of providing the cut portions 54 and 55 as in the first embodiment, the coupling portions 52 and 53 are heat-denatured by laser irradiation, for example, so that the characteristics are changed to non-magnetic properties. That is, the portions 58 and 59 are formed. Also in this case, as in the case of the first embodiment, if the circumferential width of the modified portions 58 and 59 is shorter than the gap length, which is the gap between the rotor and the stator, a part of the magnetic flux is partly modified. 53, it is desirable that the width of the modified portions 58 and 59 is set to be twice or more the gap length.

Moreover, according to the configuration of the fifth embodiment, since the conductive material holding holes 11b, 11c, 12b, and 12c are closed in cross-sectional shape, the outer peripheral side of the core 1 is not restrained when performing die casting. However, the conductive material 7 such as aluminum does not flow out from the conductive material holding holes 11b, 11c, 12b, and 12c toward the outer peripheral side of the core 2, so that the manufacturing is facilitated and the cost can be reduced.
Since other configurations and operational effects are the same as those in the first embodiment, detailed description thereof is omitted here.

Embodiment 6 FIG.
FIG. 9 is a cross-sectional view of the core constituting the rotor of the reluctance type rotating electric machine according to the sixth embodiment of the present invention, and the same reference numerals are given to the components corresponding to those in the first embodiment shown in FIGS. Is attached.

  The feature of the sixth embodiment is that three flux barrier slits 11, 12, and 13 are formed in each region divided into four in the circumferential direction of the core 2, and a total of seven slots are formed along the circumferential direction. 21 to 27 are sequentially formed. Therefore, the total number of the flux barrier slits 11, 12, 13 and the slots 21 to 27 along the circumferential direction is approximately 56 (in this case, each slot 23 is counted as two and the hole diameter of the expansion absorption hole 29 is Is small and ignores the number).

In the reluctance type rotating electric machine having four poles according to the sixth embodiment, when the outer dimension of the core 2 becomes large in order to increase the motor output, the number of slots of the stator increases accordingly. In such a case, if the total number of the flux barrier slits 11, 12, 13 and the slots 21 to 27 along the circumferential direction is approximately 56 as the rotor core for the stator, as shown in this example. Torque ripple can be reduced.
Since other configurations and operational effects are the same as those in the first embodiment, detailed description thereof is omitted here.

It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 1 of this invention. In the same reluctance type rotating electric machine, it is a vector diagram showing a relationship between current and voltage on a dq coordinate axis when a permanent magnet is attached to a flux barrier slit. It is explanatory drawing which showed the flow of the magnetic flux in the core which comprises the rotor of the same reluctance type rotary electric machine. In the rotor of the same reluctance type rotating electrical machine, it is a cross-sectional view showing the effect of suppressing expansion to the outer periphery of the core when pressure is generated when forming a secondary conductor by the die casting method. It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 2 of this invention. It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 3 of this invention. It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 4 of this invention. It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 5 of this invention. It is sectional drawing of the core which comprises the rotor of the reluctance type rotary electric machine in Embodiment 6 of this invention. It is a perspective view which shows the whole rotor in the conventional reluctance type rotary electric machine. It is sectional drawing of the core of the rotor in the reluctance type rotary electric machine. In the conventional reluctance type rotary electric machine, it is a vector diagram which shows the relationship between the electric current and voltage on a dq coordinate axis.

Explanation of symbols

1 rotor, 2 core, 5 core punching plate, 7 conductive material, 8 secondary conductor,
11, 12, 13 flux barrier slit, 11a, 12a magnet mounting hole,
11b, 11c, 12b, 12c conductive material holding holes, 21-25 slots,
29 expansion absorption holes, 31, 32, 33 permanent magnets, 51, 52, 53 connecting portions,
54,55 Excised part, 57 Notch part, 58,59 Denatured part.

Claims (11)

The rotor core has a plurality of flux barrier slits formed so as to protrude from the vicinity of the core periphery toward the center of the core so as to produce a magnetic resistance difference according to the rotational position of the core, and in the vicinity of the core periphery. A plurality of slots arranged along the circumferential direction are formed together, and at least a secondary conductor is incorporated in the slot, and a reluctance torque is generated by the flux barrier slit, and the slot and the secondary conductor are formed. In the lactance type rotating electrical machine that starts rotation by the induction action of the conductor,
A magnet is attached to a part of the flux barrier slit, and a connecting portion located between the flux barrier slit and the outer periphery of the core is configured to be magnetically non-magnetic. Reluctance type rotating electric machine. 2. The reluctance type according to claim 1, wherein a width in the circumferential direction of the coupling portion having the magnetically non-magnetic characteristic is set to be not less than a gap length which is a gap between the stator and the rotor. Rotating electric machine. The reluctance type rotating electric machine according to claim 1 or 2, wherein the non-magnetic characteristic of the thin-walled connecting portion is configured by mechanically cutting the connecting portion. The reluctance type rotating electrical machine according to claim 1 or 2, wherein the non-magnetic characteristic of the thin-walled connecting part is configured by modifying the magnetic characteristic of the connecting part. The expansion absorption hole is formed in the part located between the slot located on the central axis between said magnetic poles, and a core outer periphery, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Reluctance rotary electric machine. 6. The reluctance type rotating electrical machine according to claim 5, wherein instead of forming the expansion absorbing hole, the outer periphery of the core where the slot is located is notched inward to form a notch. The reluctance type rotating electric machine according to any one of claims 1 to 6, wherein a shape of the flux barrier slit into which the magnet is inserted is an arc shape. The reluctance type rotating electrical machine according to any one of claims 1 to 7, wherein all of the portions of the flux barrier slit into which the magnet is inserted have the same shape. The reluctance type rotating electrical machine according to any one of claims 1 to 8, wherein a shape of a part of the slots is different from a shape of other slots. The reluctance type rotating electrical machine according to any one of claims 1 to 9, wherein the total number of circumferential arrangements of the flux barrier slits and slots is set to 44. The reluctance type rotating electrical machine according to any one of claims 1 to 9, wherein the total number of circumferential arrangements of the flux barrier slits and slots is set to 56.

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