JP2020096426A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of effectively utilizing three of a magnetic torque, a field current torque, and a reluctance torque at the same time.SOLUTION: A rotary electric machine is provided with: a field yoke provided on the outer periphery of a stator core; and a field coil provided on a position opposite to an axial end of a rotor core of the field yoke. An area surrounded with a magnet 18s in a surface opposite to the field coil of a first rotor core 14 of a rotor 10 is formed. By providing an additional rotor core 17 on this area, current that flows in the field coil selectively generates a field current magnetic flux to secure an inductance difference (Lq-Ld), which suppresses the reduction of a reluctance torque.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary electric machine.

Patent Document 1 discloses a rotor core in which a rotatable rotary shaft, a cylindrical stator core, a rotor core fixedly mounted on the rotary shaft, and a set of magnetic poles of different magnets are arranged in the radial direction of the rotor core. By setting a magnet set to, a field yoke provided on the outer periphery of the stator core, and a magnetic circuit between the field yoke and the rotor core, it is possible to control the magnetic flux density between the rotor core and the stator core. And a rotary electric motor with a wire. Moreover, the structure which arrange|positions a magnet in V shape is described.

FIG. 15 shows a cross-sectional view of the rotor described in Patent Document 1. The rotor 40 has a rotor core 43, and the rotor core 43 has a cylindrical laminated rotor core 43a and a dust rotor core 43b provided on the inner circumference of the laminated rotor core 43a. In the rotor 40, a magnet pair 49A composed of two magnets 44A and 44A and a magnet pair 49B composed of two magnets 44B and 44B, which are arranged at a circumferential interval from the magnet pair 49A, are provided. There is. The magnets 44A and 44B are inserted into magnet insertion holes formed in the rotor 40. In the rotor 40 configured as described above, the magnets are arranged in a V shape, and the V-shaped magnets of the portion (the magnetic pole 2) that originally had the salient poles are opened to form iron so that the magnetic resistance with respect to the magnetic pole 1 is increased. By lowering it, the field current magnetic flux passes through the center of the d-axis magnetic path of the magnetic pole 2, and the field current torque is generated. By making the magnet of the magnetic pole 2 small and arranging iron on the left and right, the q-axis inductance is increased and reluctance torque is generated. In addition to the magnet torque and the field current torque, the reluctance torque is also used.

JP, 2008-43099, A

In Patent Document 1, the inductance of the d-axis central portion of the magnetic pole 2 (the portion where the iron is arranged between the V-shaped magnets) is increased, and the field current magnetic flux is caused to flow through this portion to generate the field current torque. If this is attempted, the increase in this inductance reduces the reluctance torque that depends on the difference (Lq-Ld) between the q-axis inductance and the d-axis inductance.

In addition, when the inductance of the magnetic pole 2 in the q-axis direction (the portions where the iron is arranged on both sides of the V-shaped magnet) is increased to increase the reluctance torque depending on (Lq-Ld), the field winding By passing the current, the field current magnetic flux also flows in the q-axis direction, and the q-axis is magnetically saturated, so that the q-axis inductance decreases and the reluctance torque decreases.

As a result, there is a problem that the magnet torque, the field current torque, and the reluctance torque cannot be effectively utilized at the same time.

An object of the present invention is to provide a rotary electric machine that can effectively utilize three of the magnet torque, the field current torque, and the reluctance torque at the same time.

The present invention provides a rotatable shaft, a rotor core fixed to the shaft, a cylindrical stator core, a field yoke provided outside the stator core, and the rotor core of the field yoke. Of a field coil that is provided at a position facing the axial end of the field coil and that forms a magnetic circuit between the field yoke and the rotor core, and first poles and second poles that are different from each other are alternately separated in the circumferential direction. And a magnet provided in the rotor core so as to be arranged in the same manner, and in the area surrounded by the magnet in the surface of the rotor core facing the field coil, the first pole and the second pole In the rotating electric machine, a field current magnetic flux is generated in one of the pole regions by the current flowing in the field coil, and is not generated in the other pole region.

In one embodiment of the present invention, an additional rotor core that is provided in the area of one of the poles of the rotor core and projects in the direction of the field coil, and a position of the field yoke that faces the additional rotor core. And a field yoke around which the field coil is wound.

In another embodiment of the present invention, the magnet includes a first magnet that constitutes the first pole and a second magnet that constitutes the second pole, and is surrounded by the first magnet of the first pole. The region surrounded by the second magnet of the second pole is the same as the region surrounded by the second magnet.

In still another embodiment of the present invention, the rotor includes a plurality of q-axis magnetic paths having a q-axis inductance higher than a d-axis inductance due to the first magnet and the second magnet. At least one of the magnetic paths does not interfere with the field current flux.

In still another embodiment of the present invention, the field coil is provided at a position facing an axial end of the rotor core, and forms a magnetic circuit between the field yoke and the rotor core. Of the region surrounded by the magnet in the first surface of the rotor core facing the first field coil, which is composed of a field coil and a second field coil, of the first pole and the second pole. A field current magnetic flux is generated in the area of one of the poles by the current flowing through the first field coil, and is not generated in the area of the other pole of the other, and is generated in the second field coil of the rotor core. A field current magnetic flux generated by a current flowing through the second field coil in a region of the other pole of the first pole and the second pole in a region surrounded by the magnets in the opposing second surface. Is generated, and is not generated in the area of either pole. Alternatively, the field coil is provided at a position facing an axial end of the rotor core, and forms a magnetic circuit between the field yoke and the rotor core. A region of one of the first pole and the second pole of a region surrounded by the magnet in the first surface of the rotor core that faces the first field coil of the rotor core. A field current magnetic flux is generated by the current flowing through the first field coil, is not generated in the area of the other pole, and is in the second surface of the rotor core facing the second field coil. A field current magnetic flux is generated by the current flowing through the second field coil in the one pole region of the region surrounded by the magnets, and is not generated in any one of the other pole regions.

According to the present invention, the magnet torque, the field current torque, and the reluctance torque can be effectively utilized at the same time. Particularly, according to the present invention, by ensuring the difference (Lq-Ld) between the q-axis inductance Lq of the q-axis magnetic path and the d-axis inductance Ld of the d-axis magnetic path, the reluctance torque proportional to (Lq-Ld). Can be secured.

It is a perspective view of the rotor of an embodiment. It is a partially expanded view of FIG. It is a partial perspective view of the rotary electric machine of embodiment. It is a torque explanatory view (the 1) of a prior art. It is a torque explanatory view of an embodiment. It is a partially expanded perspective view of the rotary electric machine of other embodiment. It is torque explanatory drawing of other embodiment. It is a partial perspective view of the rotary electric machine of other embodiment. It is a partial perspective view of the rotary electric machine of other embodiment. It is a partial perspective view (2) of the rotary electric machine of embodiment. It is a magnet arrangement explanatory drawing of other embodiment. It is an additional rotor core arrangement explanatory drawing of other embodiment. It is an additional rotor core arrangement explanatory drawing of other embodiment. It is a magnet arrangement explanatory drawing of other embodiment. It is explanatory drawing of a prior art.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of a rotor 10 of a rotary electric machine according to this embodiment. Further, FIG. 2 is a partially enlarged view of the rotor 10 shown in FIG. 1, and more specifically, is a perspective view of a quarter cut except the shaft 12 of the rotor 10. Furthermore, FIG. 3 shows a partial perspective view of the rotary electric machine according to the present embodiment.

First, the stator will be described.

As shown in FIG. 3, the stator 50, which is arranged on the outer peripheral side of the rotor 10 with a gap formed between the stator 10 and the rotor 10, is formed on the stator core and the inner surface of the stator core, and protrudes in the radial direction of the stator core. A plurality of stator teeth and a stator coil wound around the stator teeth. The stator teeth are formed at equal intervals in the circumferential direction. The stator coil constitutes a U-phase coil, a V-phase coil, and a W-phase coil, and one end of the stator coil serves as a terminal and the other end serves as a neutral point. Any one of a U-phase cable, a V-phase cable and a W-phase cable of the inverter three-phase cable is connected to the terminal, and the neutral point is commonly connected to one point. A control current according to the torque command value is supplied from the control device to the three-phase cable.

A field yoke and a field coil are provided outside the stator. The field yoke includes a top plate portion 50a arranged at a position axially separated from both ends of the stator 50 and the rotor 10, a cylindrical side wall portion 50b formed on a peripheral edge portion of the top plate portion 50a, and a ceiling. It has a cylindrical protrusion 50c formed on the plate portion 50a. A through hole is formed in the center of the top plate portion 50a, and the shaft 12 of the rotor 10 is inserted into the through hole. Further, the side wall portion 50b is fixed to the outer surface of the stator core. The cylindrical protrusion 50c formed on the top plate portion 50a is formed on the inner surface of the top plate portion 50a and projects toward the axial end portion of the rotor 10. The protrusion 50c and the end of the rotor 10 are close to each other between the protrusion 50c and the end of the rotor 10 to the extent that the lines of magnetic force are not interrupted.

The field coil is wound around the outer surface of the protrusion 50c. By supplying a field current to the field coil, the protrusion 50c functions as a field core, and induces, for example, S pole magnetism on the end side of the protrusion 50c and N pole magnetism on the side wall portion 50b. Can be made Specifically, when a field current is passed through the field coil, it passes through the top plate portion 50a of the field yoke, enters into the stator core from the side wall portion 50b, and enters into the rotor core of the rotor 10 through the gap. A magnetic circuit is formed that advances in the axial direction and enters the field yoke from the axial end of the rotor core via the protrusion 50c. The field coils are arranged at positions facing both axial ends of the rotor 10, respectively.

The protrusion 50c functioning as a field core is formed on the inner surface of the top plate 50a and protrudes toward the axial end of the rotor 10. More specifically, as shown in FIG. It projects toward the outer peripheral side end of the rotor core. As will be described later, the rotor core of the rotor 10 is composed of a cylindrical first rotor core 14 on the outer peripheral side and a second rotor core 16 on the inner peripheral side. Protruding towards.

Next, the rotor will be described.

1 and 2, the rotor 10 includes a rotor core cylindrically arranged on the outer circumference of a shaft 12 as a rotating shaft, and magnets 18n and 18s sequentially arranged on the outer circumference side of the rotor core so that their magnetic poles are different from each other. including. The magnets 18n and 18s are composed of two magnets which are arranged in a V shape and are separated from each other by a predetermined distance. The V-shaped arrangement is an example, and the present invention is not necessarily limited to the V-shaped arrangement.

The rotor core includes a cylindrical first rotor core 14 on the outer peripheral side and a second rotor core 16 on the inner peripheral side. The first rotor core 14 is circumferentially divided into the first rotor core 14n and the first rotor core 14s by the magnets 18n and 18s. Here, n and s attached to the symbols mean the north pole and the south pole of the magnetic poles, respectively. Regarding the magnetic resistance, the region where the magnets 18n and 18s are arranged is a region where the magnetic resistance is relatively large and is surrounded by the region where the magnets 18n and 18s are not arranged, specifically, the magnets 18n and 18s. The region is a region where the magnetic resistance is relatively small.

Each of the magnets 18n and 18s is formed by arranging two magnets in a V shape, but the two magnets forming the magnet 18n and the two magnets forming the magnet 18s have the same size. Further, the distance between the two magnets forming the magnet 18n and the distance between the two magnets forming the magnet 18s are also the same.

As shown in FIG. 15, in the conventional rotor configuration, the magnets 49A and 49B arranged in a V shape are different in size, and the magnet 49B forming the magnetic pole 2 is larger than the magnet 49A forming the magnetic pole 1. Is smaller, and the gap in the V-shaped arrangement of the magnets 49B is larger than the gap in the V-shaped arrangement of the magnets 49A. On the other hand, the magnets 18n and 18s of the present embodiment have the same size, and the V-shaped arrangement interval of the magnets 18n and the V-shaped arrangement interval of the magnets 18s are the same.

The first rotor cores 14n and 14s have N poles and S poles alternately arranged in the circumferential direction. However, with respect to any one pole of the first rotor cores 14n and 14s, for example, the S rotor first rotor core 14s, The additional rotor core 17 is added in the axial direction to the outer peripheral region surrounded by the pair of V-shaped magnets 18s and extended in the axial direction. That is, regarding the first rotor core 14s, the additional rotor core 17 is added in the axially upward direction in the drawing in the region surrounded by the magnet 18s having a relatively large magnetic resistance, and the magnetic resistance is relatively small. With respect to the first rotor core 14n, the additional rotor core 17 is not added to the region surrounded by the magnets 18n in the axial upward direction in the drawing. Of the two end faces of the rotor 10, when the end face located in the axial upper direction in the drawing is the first face, the additional rotor core 17 is added only to the first rotor core 14s arranged in the circumferential direction on the first face, and Since the additional rotor core 17 is not added to the rotor core 14n, the addition of the additional rotor core 17 causes unevenness to be formed alternately in the circumferential direction along the axial direction. Similarly, regarding the first rotor core 14s, an additional rotor core 17 is added in the axially downward direction in the drawing in an area surrounded by the magnets 18s having a relatively large magnetic resistance and having a relatively small magnetic resistance, so Regarding the first rotor core 14n, which is extended downward, the additional rotor core 17 is not added to the region surrounded by the magnet 18n in the axial downward direction in the drawing. Of the both end surfaces of the rotor 10, if the end surface located in the axial upper direction in the figure is the second surface, then the second surface is added only to the first rotor core 14s arranged in the circumferential direction in the same manner as the first surface. Since the rotor core 17 is added and the additional rotor core 17 is not added to the first rotor core 14n, the addition of the additional rotor core 17 results in the formation of irregularities alternately in the circumferential direction along the axial direction.

As described above, the field coil (first field coil) wound around the projection 50c of the field yoke faces the first surface of the rotor 10, and the projection 50c is formed on the first surface. Among them, since it projects toward the first rotor core 14, in the relationship between the first field coil and the first rotor cores 14n and 14s on the first surface, the first field coil and The magnetic resistance in the axial direction between the first rotor core 14s and the first rotor core 14s becomes small, and the magnetic flux generated in the first field coil selectively flows through the first rotor core 14s. Similarly, a field coil (second field coil) wound around the projection 50c of the field yoke faces the second surface of the rotor 10, and the projection 50c is the first of the second surfaces. Since it projects toward the rotor core 14, in the relationship between the second field coil and the first rotor cores 14n and 14s on the second surface, the second field coil and the first rotor core 14s are added as much as the additional rotor core 17 is added. The magnetic resistance in the axial direction between and becomes smaller, and the magnetic flux generated in the second field coil selectively flows through the first rotor core 14s. Therefore, by supplying currents in opposite directions to the first field coil and the second field coil, the field magnetic flux selectively flows through the first rotor core 14s on the first surface and the second surface.

In the present embodiment, since the additional rotor core 17 is added, the magnetic flux (field current magnetic flux) generated in the field coil selectively flows through the first rotor core 14s, so that the magnets 18s are arranged between the V-shaped intervals. , That is, it selectively flows through the d-axis magnetic path of the S pole. This means that in the present embodiment, as in the prior art, the V-shaped arrangement of one magnetic pole (for example, the S pole) is made wider than the other (N pole) to make the magnetic resistance relatively small, and This means that it is not necessary to generate the field current torque by passing the current magnetic flux through the center of the d-axis magnetic path of the S pole. Since the d-axis inductance increases by lowering the magnetic resistance of the V-shaped arrangement of the S pole, the reluctance torque depending on the difference (Lq-Ld) between the q-axis inductance and the d-axis inductance is reduced in the conventional technique. In the present embodiment, since it is not necessary to increase the d-axis inductance, the reluctance torque that depends on the difference (Lq-Ld) between the q-axis inductance and the d-axis inductance is secured.

FIG. 4 shows torque in the configuration of the related art shown in Patent Document 1. FIG. 4A is a top view showing a magnet arrangement according to the related art, and FIG. 4B is a relationship between the presence/absence of a field current and a torque value.

The magnets 49A and 49B are different in size, the V-shaped arrangement of the magnets 49B is relatively large, and the magnetic resistance is relatively small. When a field current is passed, the total torque value is increased, but the reluctance torque value is greatly reduced by passing the field current. This is because the d-axis inductance Ld is increased and the difference (Lq-Ld) between the q-axis inductance and the d-axis inductance is reduced by decreasing the magnetic resistance of the magnet 49B in the V-shaped arrangement.

On the other hand, FIG. 5 shows the torque in this embodiment. FIG. 5A is a top view showing the magnet arrangement of the embodiment, and FIG. 5B shows the relationship between the presence or absence of the field current and the torque value.

The magnets 18n and 18s have the same size, and the V-shaped arrangement of the magnets 18n and the V-shaped arrangement of the magnets 18s are equal. When the field current is passed, the total torque value increases. Furthermore, although the reluctance torque value is reduced by flowing the field current, the reduction range is significantly suppressed. In this way, the reduction of the reluctance torque is suppressed because the spacing of the V-shaped arrangement of the magnets 18s is the same as that of the magnets 18n, the d-axis inductance Ld does not increase, and the difference between the q-axis inductance and the d-axis inductance ( This is because Lq-Ld) is secured. The reluctance torque is proportional to (Lq-Ld), and the reluctance torque is secured by securing (Lq-Ld). In the prior art, a magnet is also arranged in the q-axis magnetic path so that the field current magnetic flux does not flow to the first pole, and Lq does not increase so much, but in the present embodiment, the field current flows to the first pole. Since it is not necessary to dispose a magnet in the q-axis magnetic path so as not to flow, it is also contributing that Lq can be set relatively large.

In the present embodiment, the first field coil is wound around the protrusion 50c facing the first surface of the rotor 10, the additional rotor core 17 is added to the first rotor 14s on the first surface of the rotor 10, and the rotor 10 The second field coil is wound around the protrusion 50c facing the second surface, and the additional rotor core 17 is added to the first rotor 14s on the second surface of the rotor 10 to form the first field coil and the second field coil. The second field coil is wound around the protrusion 50c facing the second surface of the rotor, so that the first rotor 14s on the second surface of the rotor 10 does not An additional rotor core 17 may be added to 14n to extend in the axial direction, and currents in the same direction may flow in the first field coil and the second field coil.

FIG. 6 shows the configuration in this case. Similar to FIG. 3, the additional rotor core 17 is added only to the first rotor core 14s on the first surface of the rotor 10, and the additional rotor core 17 is added only to the first rotor core 14n to the second surface of the rotor 10. .. On the first surface, the additional rotor core 17 selectively causes the magnetic flux generated by the first field coil to flow to the first rotor core 14s, and on the second surface, the additional rotor core 17 selectively causes the magnetic flux generated by the second field coil to be first. Since it flows through one rotor core 14n, field current magnetic fluxes having different directions alternately in the circumferential direction are generated. The magnet magnetic flux flowing in the first rotor core 14n and the field current magnetic flux have the same direction, and the magnet magnetic flux flowing in the first rotor core 14s and the field current magnetic flux have the same direction. Therefore, the magnetic flux of the magnet can be strengthened by the magnetic flux of the field current.

FIG. 7 shows torque values when a field current is applied in the configurations of FIG. 3 and FIG. Assuming that the configuration of FIG. 3 is the embodiment A and the configuration of FIG. 7 is the embodiment B, the total torque value is increased in the embodiment B because the magnet torque is increased.

As described above, in the rotary electric machine according to the present embodiment, the additional rotor core 17 is configured to selectively generate the field current magnetic flux in either one of the first rotor cores 14n and 14s. Since it is not necessary to selectively pass a field current to either one of the arrangements, a difference (Lq-Ld) between the inductance Lq of the q-axis magnetic path and the inductance Ld of the d-axis magnetic path is ensured, and the magnet torque and the field can be secured. In addition to the magnetic current torque, the reluctance torque can be effectively used.

Further, the magnet torque can be further increased by adding the additional rotor core 17 to both the first surface and the second surface, which are the two end surfaces along the axial direction of the rotor 10.

In the present embodiment, the additional rotor core 17 is added in the axial direction to the region surrounded by the magnets 18s or the magnets 18n, which is the region where the magnetic resistance is relatively large in the rotor surface, and thus the magnetic resistance difference in the axial direction is utilized. Although the field current magnetic flux is selectively caused to flow, the radial magnetic resistance difference may be used in addition to the axial magnetic resistance difference.

FIG. 8 shows a configuration of a rotary electric machine that utilizes a magnetic resistance difference in the radial direction. The additional rotor core 17 is axially added to the first rotor core 14s on the first surface and the second surface of the rotor 10, but the additional rotor core 17 is extended further in the axial direction than in the case of FIG. Reaches near the top plate portion 50a. Therefore, due to the additional rotor core 17 further extended in the axial direction, a magnetic resistance difference is generated in the radial direction in the top plate portion 50a of the field yoke, and the magnetic resistance at the portion where the additional rotor core 17 is added is higher than that at other portions. Get smaller. That is, by adding the additional rotor core 17, a magnetic resistance difference is generated not only in the axial direction but also in the radial direction, and the field current magnetic flux selectively flows through the additional rotor core 17 and the first rotor core 14s. By adding the additional rotor core 17, a magnetic resistance difference is generated not only in the axial direction but also in the radial direction, so that the field current magnetic flux selectively flows through the additional rotor core 17 and the first rotor core 14n.

In addition, in the present embodiment, the additional rotor core 17 is arranged so as to be separated from each other in the circumferential direction on the first surface and the second surface, but the additional rotor core 17 is arranged in the circumferential direction within the range where the magnetic resistance difference can be secured. They may be combined with each other.

FIG. 9 shows the configuration of the additional rotor core 17 in this case. The additional rotor cores 17 are arranged so as to be spaced apart from each other in the circumferential direction, and their axial ends, that is, the ends of the field yoke on the side of the protrusion 50 c are joined in the circumferential direction by the annular core 19. As a result, the mechanical strength of the additional rotor core 17 can be improved while maintaining the magnetic resistance difference.

Further, in the present embodiment, the magnets 18n and 18s are arranged in the first rotor core 14 in a V shape, but the portion in which the field current magnetic flux flows in the axial direction is not limited to this. For example, a plurality of V-shaped magnets may be arranged in the radial direction.

FIG. 10 shows the V-shaped arrangement of the magnets 18n and 18s shown in FIG. 1 and the like, and the q-axis magnetic paths are respectively formed on the outer peripheral side and the inner peripheral side of the magnets 18n and 18s arranged in the V shape. Is formed.

FIG. 11 shows a configuration in which two sets of V-shaped magnets 18n and 18s are arranged in the radial direction. Regarding the magnet 18n, the outer peripheral magnet 18n-1 and the inner peripheral magnet 18n-2 are arranged in a V shape. A q-axis magnetic path is formed in each of the region surrounded by the outer peripheral magnet 18n-1, the region surrounded by the magnets 18n-1 and 18n-2, and the inner peripheral region of the inner peripheral magnet 18n-2. It is formed. Similarly, with respect to the magnet 18s, the outer peripheral side magnet 18s-1 and the inner peripheral side magnet 18s-2 are arranged in a V shape. A q-axis magnetic path is formed in each of the area surrounded by the outer magnet 18s-1, the area surrounded by the magnets 18s-1 and 18s-2, and the inner area of the inner magnet 18s-2. It is formed.

Regarding the first surface of the rotor 10, the additional rotor core 17 is added only to the region surrounded by the magnet 18s-1 on the outer peripheral side among the magnets 18s-1 and 18s-2 that form the magnet 18s. The second surface of the rotor 10 can also be added only to the region surrounded by the magnet 18s-1 on the outer peripheral side among the magnets 18s-1 and 18s-2 that form the magnet 18s.

In FIG. 12, similarly to FIG. 11, with respect to the magnet 18n, the outer peripheral side magnet 18n-1 and the inner peripheral side magnet 18n-2 are arranged in a V shape, and the magnet 18s also has an outer peripheral side magnet 18s−. 1 and the magnets 18s-2 on the inner peripheral side are arranged in a V shape, the additional rotor core 17 includes the magnet 18s-1 and the magnets 18s-2 constituting the magnets 18s on the first surface of the rotor 10. Of these, it is added to the area surrounded by the magnet 18s-2 on the inner peripheral side. The second surface of the rotor 10 may also be added to the region surrounded by the magnet 18s-2 on the inner peripheral side among the magnets 18s-1 and 18s-2 that form the magnet 18s.

Further, in FIG. 13, similarly to FIG. 11, with respect to the magnet 18n, the outer peripheral magnet 18n-1 and the inner peripheral magnet 18n-2 are arranged in a V shape, and the magnet 18s also has an outer peripheral magnet. In the configuration in which 18s-1 and the magnet 18s-2 on the inner peripheral side are arranged in a V shape, the additional rotor core 17 has a magnet 18s-1 and a magnet 18s- which configure the magnet 18s on the first surface of the rotor 10. It is added only to the area surrounded by 2. The second surface of the rotor 10 may be added only to the region surrounded by the magnets 18s-1 and 18s-2 that form the magnet 18s.

Although any of the configurations of FIGS. 10 to 13 is possible, it is desirable that the field current magnetic flux does not flow in at least one q-axis magnetic path of the plurality of q-axis magnetic paths. This is to reduce the interference between the reluctance torque and the field current torque as much as possible.

Further, as described above, the V-shaped arrangement of the magnets is an example, and the magnet is not necessarily limited to the V-shaped arrangement. FIG. 14 shows a configuration of magnet arrangements other than the V-shaped arrangement. FIG. 14A shows an arrangement having flat plate magnets 18n and 18s and voids 20 at both ends thereof, and FIG. 14B shows an arrangement having arcuate magnets 18n and 18s. In the magnet arrangement of FIG. 14A, the additional rotor core 17 can be added in the axial direction to the region surrounded by the magnet 18n and the voids 20 at both ends thereof, or the region surrounded by the magnet 18s and the voids 20 at both ends thereof. In the magnet arrangement of FIG. 14B, the additional rotor core 17 can be added in the axial direction to the region surrounded by the arc-shaped magnet 18n or the region surrounded by the arc-shaped magnet 18s.

Although the embodiment of the present invention has been described above, the additional rotor core 17 of the present embodiment can be similarly applied to the structure of the multilayer flux barrier.

In addition, in the configurations shown in FIGS. 8 to 13, the additional rotor core 17 is added to the first rotor core 14s in the axially upward direction for the first surface of the rotor, and the second surface of the rotor is added for the first surface of the rotor. Although the description has been given on the assumption that the rotor core 17 is added to the first rotor core 14s in the axially downward direction (the first field coil and the second field coil are energized in opposite directions to each other), the configuration shown in FIG. That is, for the first surface of the rotor, the additional rotor core 17 is added to the first rotor core 14s in the axially upward direction, and for the second surface of the rotor, the additional rotor core 17 is added to the first rotor core 14n in the axially downward direction. The configuration may be premised (the first field coil and the second field coil are energized in the same direction). In the case of FIG. 3, the field current magnetic flux flows through the same first rotor core 14s on the first surface and the second surface, which facilitates magnetic saturation, but in the case of FIG. 6, on the first surface and the second surface. Since the field current magnetic flux flows through the different first rotor cores 14s and 14n, magnetic saturation is relaxed and, as a result, the total torque can be increased.

Further, in the present embodiment, the additional rotor core 17 is added to the first surface and the second surface of the rotor in the axial direction. However, the additional rotor core 17 is added to either the first surface or the second surface, for example, only the first surface. May be added axially upward to the first rotor core 14s, or an additional rotor core 17 may be added axially downward to the first rotor core 14n only on the second surface. The configuration in which the additional rotor core 17 is added only to the first surface corresponds to the configuration in which the additional rotor core 17 on the second surface side (the lower surface in the drawing) in FIG. 2 is deleted. In short, the additional rotor core may be axially added to at least one of the first surface and the second surface of the rotor.

10 rotor, 12 shaft, 14, 14n, 14s 1st rotor core, 16 2nd rotor core, 17 additional rotor core, 18, 18n, 18s magnet, 50a top plate part, 50b side wall part, 50c projection part.

Claims (8)

With a rotatable shaft,
A rotor core fixed to the shaft;
A stator core formed in a tubular shape,
A field yoke provided outside the stator core,
A field coil that is provided at a position of the field yoke that faces an axial end portion of the rotor core, and that forms a magnetic circuit between the field yoke and the rotor core.
A magnet provided in the rotor core such that first poles and second poles that are different from each other are alternately spaced apart in the circumferential direction;
Equipped with
Of the region surrounded by the magnets in the surface of the rotor core that faces the field coil, the current flowing in the field coil causes the region of either one of the first pole and the second pole to move. A field electric current magnetic flux is generated, and is not generated in the area of the other pole. An additional rotor core that is provided in the area of one of the poles of the rotor core and projects in the direction of the field coil,
A field yoke provided at a position of the field yoke that faces the additional rotor core, and around which the field coil is wound;
The rotary electric machine according to claim 1, further comprising: The magnet includes a first magnet forming the first pole and a second magnet forming the second pole,
The region of the first pole surrounded by the first magnet and the region of the second pole surrounded by the second magnet are the same.
The rotary electric machine according to claim 2. The rotor has a plurality of q-axis magnetic paths in which the q-axis inductance is higher than the d-axis inductance due to the first magnet and the second magnet.
The rotary electric machine according to claim 3, wherein at least one magnetic path of the plurality of q-axis magnetic paths does not interfere with the field current magnetic flux. The field coil includes a first field coil and a second field coil that are provided at positions facing the axial end of the rotor core and that form a magnetic circuit between the field yoke and the rotor core. Composed,
In the area surrounded by the magnet in the first surface of the rotor core facing the first field coil, the first field is provided in the area of one of the first pole and the second pole. A field current magnetic flux is generated by the current flowing through the magnetic coil, and is not generated in the area of either pole,
In the area surrounded by the magnet in the second surface of the rotor core facing the second field coil, the second field is formed in the area of the other pole of the first pole and the second pole. The rotating electric machine according to claim 1, wherein a field current magnetic flux is generated by a current flowing through the magnetic coil, and is not generated in one of the pole regions. The first field coil and the second field coil are supplied with currents in the same direction.
The rotary electric machine according to claim 5. The field coil includes a first field coil and a second field coil that are provided at positions facing the axial end of the rotor core and that form a magnetic circuit between the field yoke and the rotor core. Composed,
In the area surrounded by the magnet in the first surface of the rotor core facing the first field coil, the first field is provided in the area of one of the first pole and the second pole. A field current magnetic flux is generated by the current flowing through the magnetic coil, and is not generated in the area of either pole,
Of the region surrounded by the magnet in the second surface of the rotor core facing the second field coil, a field current magnetic flux is generated in a region of the one pole by a current flowing through the second field coil. The rotary electric machine according to claim 1, wherein the rotary electric machine is generated and is not generated in the area of the other pole. Currents in opposite directions are applied to the first field coil and the second field coil,
The rotating electric machine according to claim 7.

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