JP6847164B2 - Rotating machine - Google Patents

Description

The present application relates to a rotary electric machine.

Conventionally, for the purpose of effectively suppressing demagnetization of a permanent magnet and providing an electric rotary machine capable of performing high-quality rotary drive with excellent durability, the reduction generated by a permanent magnet for each magnetic pole is used. An electric rotary machine is disclosed in which a magnetic resistance increasing region for increasing magnetic resistance is formed in the middle of a magnetic path of magnetic flux generated by energizing a coil toward a magnetic portion (see, for example, Patent Document 1).

In Patent Document 1 described above, the stator has a plurality of teeth facing the rotor and a plurality of slots in a space around which the coil is wound around the teeth, and the rotor exerts a magnetic force on the teeth. In an electric rotor in which a pair of permanent magnets are embedded in a V shape, it is generated by the permanent magnets when the pair of permanent magnets on the rotor side corresponding to the six slots on the stator side are set to one magnetic pole. In the middle of the magnetic path of the magnetic flux generated by energizing the coil toward the demagnetizing region, as a magnetic resistance increasing region that increases the magnetic resistance, 56 degrees (56 degrees) at equal positions on both sides in the forward and reverse directions from the d-axis at the center of one magnetic pole. An electric rotary machine is disclosed in which an adjusting groove having an electric angle) as the deepest portion is formed so as to have a facing width of the teeth. Further, although the groove width of the adjusting groove may be smaller than the facing width thereof, it is disclosed that it is effective to adjust the magnetoresistance over the entire facing width through which the magnetic flux passes.

Japanese Unexamined Patent Publication No. 2013-162557

However, for example, in Patent Document 1 described above, since the adjusting groove is provided on the path where the magnetic flux created by the stator winding intersects the permanent magnet, it has a function of enhancing the demagnetization resistance of the permanent magnet. On the other hand, there is a problem that the output of the rotating electric machine is not efficiently improved because the leakage magnetic flux of the permanent magnet is not reduced and the fundamental wave component of the magnetic flux of the rotor, which mainly contributes to the torque, is not improved.

The present application discloses a technique for solving the above-mentioned problems, and by improving the demagnetization resistance performance while reducing the leakage magnetic flux of the permanent magnet and maintaining the magnetic force of the permanent magnet, the rotor It is an object of the present invention to provide a rotary electric machine capable of improving the fundamental wave component of magnetic flux and having improved output more efficiently.

The rotary electric machine disclosed in the present application is a rotor having a rotor core attached to a rotating shaft and a permanent magnet mounted in an insertion hole of the rotor core, and faces the outer peripheral surface of the rotor via a gap. A plurality of flange portions formed on the inner side in the radial direction facing the rotor, and a plurality of joint iron portions formed on the inner side in the radial direction to the outer side in the radial direction extending from the plurality of flange portions. The stator having the above, and a gap expanding portion formed on the outer periphery of the rotor and expanding the gap distance from the inner peripheral surface of the stator are provided, and the gap expanding portion is formed on the rotor core. It is a groove portion, and is formed in a convex shape from the first intersection and the second intersection, which are the intersections of the outer peripheral circle of the rotor and the gap expansion portion, toward the axis of the rotation axis, and the rotor magnetic poles are formed. The width of the rotation direction between the first intersection, which is the intersection of the rotor outer circle and the void expansion portion, and the second intersection is different between the north pole and the south pole. The width of the gap expanding portion in the rotation direction is characterized in that the pole that becomes the north pole is larger than the pole that becomes the south pole.

According to the rotary electric machine disclosed in the present application, it is possible to improve the fundamental wave component of the magnetic flux of the rotor by improving the demagnetization resistance performance and maintaining the magnetic force of the permanent magnet while reducing the leakage magnetic flux of the permanent magnet. It is possible to obtain a rotating electric machine with improved output more efficiently.

It is a perspective view which shows the rotary electric machine according to Embodiment 1. FIG. It is a perspective view which shows the stator of the rotary electric machine according to Embodiment 1. FIG. It is a perspective view which shows the rotor of the rotary electric machine according to Embodiment 1. FIG. It is a perspective view which shows the rotor of the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the rotary electric machine according to Embodiment 1. FIG. It is a circuit diagram for demonstrating the operation of the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the magnetic flux density distribution at the time of excluding the void expansion part of the rotary electric machine according to Embodiment 1. FIG. It is sectional drawing which shows the q-axis magnetic flux path when the gap expansion part of the rotary electric machine by Embodiment 1 is excluded. It is sectional drawing for demonstrating the leakage flux path of the magnet magnetic flux in the case where the width in the rotation direction of the space enlargement part of the rotary electric machine by Embodiment 1 is narrow. It is a figure which shows the no-load induced voltage improvement effect by the void expansion part of the rotary electric machine according to Embodiment 1. It is sectional drawing which shows the rotary electric machine according to Embodiment 2. It is a figure which shows the no-load induced voltage improvement effect by the void expansion part of the rotary electric machine according to Embodiment 2. It is sectional drawing which shows the rotary electric machine according to Embodiment 3. FIG. It is sectional drawing which shows the path of the magnetic flux formed by the stator winding of the rotary electric machine according to Embodiment 3. FIG. It is sectional drawing which shows the magnet magnetic flux path at the time of removing the void expansion part of the rotary electric machine according to Embodiment 4. It is sectional drawing for demonstrating the shape of the void enlargement part of the rotary electric machine according to Embodiment 4. FIG. It is a figure which shows the no-load induced voltage improvement effect by the void expansion part of the rotary electric machine according to Embodiment 4. It is a perspective view which shows the rotary electric machine according to Embodiment 5. It is sectional drawing which shows the rotor of the rotary electric machine according to Embodiment 5. It is a figure which shows the outline of the permanent magnet and the bobbin of the rotary electric machine according to Embodiment 5. It is sectional drawing for demonstrating the magnetic flux path made by the rotor winding of the rotary electric machine according to Embodiment 5. It is sectional drawing for demonstrating the magnetic flux path made by the permanent magnet of the rotary electric machine according to Embodiment 5.

Embodiment 1.
Hereinafter, the first embodiment will be described with reference to the drawings. In each drawing, the same reference numerals indicate the same or corresponding parts. Each drawing illustrates the elements necessary to illustrate the present application and does not necessarily illustrate all the actual elements. In addition, when explaining the directions such as up, down, left, and right with respect to the present application, the description in the drawings is used as a reference.
Further, each dimension described in the drawing is defined by a value calculated based on the coordinate axes described in the drawing. The letters of the sign mean different elements in uppercase and lowercase. "Fixing" is arbitrary as long as the object can be fixed, and the fixing method does not matter. "Equal" means that they are almost the same, and if they differ within the range of dimension intersection, they are considered to have the same function. When the magnetization direction of the permanent magnet is indicated by an arrow in the drawing, the magnetic pole extending from the rotor inner diameter side to the rotor outer diameter side is extended to the N pole and the rotor outer diameter side to the rotor inner diameter side. Let the magnetic pole be the S pole.

FIG. 1 is a perspective view showing a rotary electric machine according to the first embodiment, and FIG. 2 is a perspective view showing a stator of the rotary electric machine according to the first embodiment. Further, FIG. 3 is a perspective view showing a rotor of the rotary electric machine according to the first embodiment, and FIG. 4 is a perspective view showing a permanent magnet and a rotor core in the rotor of the rotary electric machine according to the first embodiment. Note that in FIG. 1, the rear bracket, front bracket, bearing, and the like, which are parts not directly related to the present application, are omitted. Further, in FIGS. 1 to 4, a, b, and c in the arrow directions indicate the axial direction, the radial direction, and the rotation direction, respectively.

In FIGS. 1 to 4, the rotary electric machine 1 which is an AC generator motor 32 for a vehicle is rotatably arranged by being supported by a front bracket and a rear bracket (not shown) via bearings (not shown). A rotor 3 and a stator 2 fixed to a front bracket and a rear bracket so as to surround the outer periphery of the rotor 3 via a predetermined gap with respect to the rotor 3 are provided. The rotor 3 includes a rotor core 7 attached and fixed to the rotating shaft 4, and a magnet insertion hole 10 provided inside the rotor core 7. A permanent magnet 9 is mounted in the magnet insertion hole 10. The stator 2 is arranged so as to face the outer peripheral surface of the rotor 3 via a gap, and includes a stator core 5 and a stator winding 6.

FIG. 5 is a cross-sectional view showing a rotary electric machine according to the first embodiment. In FIG. 5, the rotor 3 of the rotary electric machine 1 according to the first embodiment is arranged in a cylindrical rotor core 7 and a magnet insertion hole 10 provided in the rotor core 7, and is arranged in a permanent magnet magnetizing direction 11. It has a permanent magnet 9 magnetized in the direction of the indicated arrow. The stator core 5 of the stator 2 has a flange portion 14 formed on the inner side in the radial direction facing the rotor 3 and a first joint formed extending from the inner side in the radial direction to the outer side in the radial direction extending from the flange portion 14. The iron portion 12 and the second joint iron portion 13 connecting the adjacent first joint iron portions 12 are provided. A plurality of first joint iron portions 12 extending from the collar portion 14 and the radial inner side to the radial outer side are provided on the inner side in the radial direction facing the rotor 3.

FIG. 6 is an enlarged cross-sectional view showing a rotary electric machine according to the first embodiment. In FIG. 6, the rotor 3 has a gap expanding portion 15 on the outer periphery of the rotor core 7 that expands the gap distance from the inner peripheral surface of the stator 2. The gap expanding portion 15 is a groove portion formed in the rotor core 7, and extends from the first intersection 36a and the second intersection 36b between the rotor outer circle 8 and the gap expanding portion 15 to the axis of the rotating shaft 4. It is formed in a convex shape toward it. The rotor outer circumference circle 8 is an outer circumference circle having a cross-sectional shape centered on the rotation shaft 4 and is the outermost circle. The gap expanding portion 15 is formed in a convex shape from the first intersection 36a and the second intersection 36b, which are the above-mentioned two intersections on the outer periphery of the rotor 3, toward the axis of the rotation shaft 4, and is formed as an N pole or S. In the rotor magnetic poles that are the poles, assuming that the central axis of the rotor magnetic poles in the rotation direction is the d-axis and the axis deviated by 90 degrees in the electrical angle from the d-axis in the rotation and counter-rotation directions is the q-axis, the gap expansion portion 15 is d It is provided between the shaft and the q-axis. In FIG. 6, the rotor 3 between the left and right q-axis sandwiching the d-axis shows one magnetic pole.

Further, the gap expanding portion 15 is an extension line connecting the first intersection 36a arranged on the d-axis side and the origin of the rotating shaft 4 at the two intersections of the gap expanding portion 15 and the rotor outer peripheral circle 8. Assuming that the angle formed by the d-axis is θA and the angle formed by the extension line connecting the second intersection 36b arranged on the q-axis side and the origin and the d-axis is θB, the rotation direction of the d-axis and the flange portion 14 When the central axis is on the same line, the magnet is placed along the magnetization vector of the permanent magnet 9 from the q-axis side end point of the magnet insertion hole 10 on the magnetic flux output surface arranged on the side of the rotor 2 of the permanent magnet 9. In the first joint iron portion 12 existing on the d-axis side of the line A extending perpendicularly to the output surface, θA is the q-axis side end point of the finest 34 of the first joint iron portion 12 centered on the origin. It is larger than the angle θ1 formed by the third intersection 37 between the perpendicular line drawn from the permanent magnet 9 and the outer circumference of the rotor 3 (rotor outer circumference circle 8) and the d-axis, and θB is a magnet centered on the origin. A structure smaller than the angle θ2 formed by the fourth intersection 38 of the line extending parallel to the q-axis from the end point on the q-axis side of the insertion hole 10 and the outer circumference of the rotor 3 (rotor outer circumference circle 8) and the d-axis. It has become.

FIG. 7 is an enlarged cross-sectional view showing a rotary electric machine according to the first embodiment. As shown in FIG. 7, the width Wslit in the rotation direction of the gap expanding portion 15 between the first intersection 36a and the second intersection 36b, which are the two intersections of the gap expanding portion 15 and the rotor outer peripheral circle 8, is the gap expanding. The width W1 in the rotation direction of the innermost surface of the innermost diameter of the flange portion 14 facing the portion 15 is larger than the width W1 in the rotation direction of the innermost surface of the collar portion 14, and there are two intervals in the rotation direction between the width W1 in the rotation direction of the innermost surface of the flange portion 14 and the adjacent collar portions 14. The configuration is smaller than the summed width W2.

FIG. 8 is a circuit diagram for explaining the operation of the rotary electric machine according to the first embodiment. Next, with reference to FIG. 8, the operation of the rotary electric motor 1 which is the AC generator motor 32 for the vehicle as an electric motor will be described. DC power is supplied from the battery 30 to the power circuit unit 31 via the power supply terminal. The control circuit unit 33 controls each switching element of the power circuit unit 31 to be ON / OFF, and converts DC power into AC power. This AC power is supplied to the stator winding 6 of the stator 2. A drive torque is generated by interlinking this magnetic flux with the magnetic flux formed by the permanent magnet 9 with a direct current or an alternating current flowing through the stator winding 6. The rotor 3 is rotationally driven by this drive torque.

Next, the operation of the rotary electric machine 1 which is the AC generator motor 32 for the vehicle as a generator will be described with reference to FIG. In the operating state of the engine, the rotational torque of the engine is transmitted from the crankshaft to the rotating shaft 4 via mechanical connection parts such as a belt or gear, and the rotor 3 is rotated. At this time, the magnetic flux formed by the permanent magnet 9 interlinks with the stator winding 6 of the stator 2, and a three-phase AC voltage is induced in the stator winding 6. Then, the control circuit unit 33 controls each switching element of the power circuit unit 31 to be ON / OFF, converts the three-phase AC power induced in the stator winding 6 into DC power, and charges the battery 30.

Next, the effect of the rotary electric machine in the first embodiment will be described with reference to FIGS. 9 to 12. FIG. 9 is a cross-sectional view showing the magnetic flux density distribution in the case where the void expansion portion of the rotary electric machine according to the first embodiment is excluded. Further, FIG. 10 is a cross-sectional view showing a q-axis magnetic flux path when the gap expansion portion of the rotary electric machine according to the first embodiment is excluded. In the first embodiment, the position of the void expanding portion 15 is based on the magnetic flux density distribution map when the void expanding portion 15 is not shown in FIG. 9 and the magnetic flux path when the void expanding portion 15 is not shown in FIG. We are considering whether it should be placed.
Further, FIG. 11 is a cross-sectional view for explaining the leakage flux path B of the magnet magnetic flux when the width in the rotation direction of the gap expanding portion of the rotary electric machine according to the first embodiment is narrow. Further, FIG. 12 is a diagram showing the effect of improving the fundamental wave component of the no-load induced voltage by the gap expanding portion 15 of the rotary electric machine 1 according to the first embodiment.

In the gap expanding portion 15 provided between the d-axis and the q-axis, the central axis in the rotational direction of the d-axis and the flange portion 14 (the center point of the teeth in the stator core 5) is on the same line, so that the torque is increased. The positional relationship between the rotor 3 and the stator 2 is such that the d-axis magnet magnetic flux that mainly contributes can be obtained more effectively. In this positional relationship, the d-axis side of the line A extending from the q-axis side end point of the magnetic flux output surface of the permanent magnet 9 along the magnetization vector of the permanent magnet 9 so as to be perpendicular to the magnet output surface. In the existing first joint iron portion 12, a perpendicular line drawn from the q-axis side end point of the finest 34 of the first joint iron portion 12 centering on the origin and the outer circumference of the rotor 3 (rotor outer circumference circle 8). ) Is formed so that θA is larger than the angle formed by the third intersection 37 and the d-axis, so that it is an input surface of the rotor magnetic flux caused by the induced voltage generated in the stator winding 6. In the finest 34 of the first joint iron portion 12, it is possible to obtain a function of reducing the leakage magnetic flux of the permanent magnet 9 while maintaining the magnetic flux density in the magnetic flux density distribution shown in FIG.

Further, the fourth intersection 38 and the d-axis between the line extending parallel to the q-axis from the q-axis side end point of the magnet insertion hole 10 centering on the origin and the outer circumference of the rotor 3 (rotor outer circumference circle 8) are formed. Since θB is smaller than the formed angle θ2, the magnetic path cross section in the q-axis magnetic path shown in FIG. 10 can be maintained, so that the reluctance torque generated by the difference between the d-axis inductance and the q-axis inductance is reduced. Without this, it is possible to obtain a function of reducing the leakage magnetic flux of the permanent magnet 9.

Further, the width Wslit in the rotation direction between the two intersections of the gap expanding portion 15 with the rotor outer circle 8 is larger than the width W1 in the rotation direction of the innermost inner surface of the flange portion 14, so that the magnetic flux of the rotor 3 is increased. It has a function of reducing the leakage flux path B (see FIG. 11) returning to the rotor 3 via the flange portion 14. According to the rotary electric machine 1 according to the first embodiment, as shown in FIG. 12, by setting Wslit> W1, the magnetic flux of the rotor 3 rotates through the flange portion 14 as compared with the case where Wslit <W1. It has a function of reducing the leakage magnetic flux returning to the child 3, and has an effect of improving the no-load induced voltage.

Further, the width in the rotation direction between the two intersections of the gap expanding portion 15 with the rotor outer circle 8 is the width in the rotation direction of the innermost inner surface of the flange portion 14 and the distance between the adjacent collar portions 14 in the rotation direction. Since the width W2 is smaller than the sum of the two widths W2, the function of reducing the leakage flux of the permanent magnet 9 can be obtained without the gap expanding portion 15 obstructing the main path of the rotor magnetic flux.
Further, the width in the rotation direction between the two intersections of the gap expanding portion 15 with the rotor outer peripheral circle 8 is larger than the width in the rotation direction of the innermost inner surface of the flange portion 14, so that the magnetic flux generated by the magnet winding 6 is formed. It is possible to suppress magnet demagnetization generated by interlinking with the permanent magnet 9, and in addition to the leakage magnetic flux reduction function of the permanent magnet 9, the magnetic force of the permanent magnet 9 is maintained by improving the demagnetization resistance performance. can do.

As described above, the rotary electric machine 1 of the first embodiment has not only the function of improving the demagnetization resistance characteristics while securing the main path of the permanent magnet 9, but also the magnetic flux generated by the permanent magnet 9 is transmitted through the flange portion 14 to the rotor. Since the function of reducing the leakage magnetic flux returning to 3 can be added, the fundamental wave component of the magnetic flux created by the permanent magnet 9 provided in the rotor 3 can be improved as compared with the conventional technique, and the output improving function of the rotary electric machine 1 can be improved. Is obtained more effectively.

Embodiment 2.
FIG. 13 is a cross-sectional view showing a rotary electric machine according to the second embodiment. Further, FIG. 14 is a diagram showing the effect of improving the fundamental wave component of the no-load induced voltage by the gap expanding portion of the rotary electric machine according to the second embodiment. As shown in FIG. 13, according to the rotary electric machine 1 according to the second embodiment, between the first intersection 36a and the second intersection 36b, which are the two intersections of the gap expanding portion 15 and the rotor outer circle 8. The width Wslit in the rotation direction is larger than the width W3 obtained by adding the width in the rotation direction of the innermost inner surface of the flange portion 14 and the distance in the rotation direction between the adjacent collar portions 14 by one.

According to the rotary electric machine 1 according to the second embodiment, as shown in FIG. 13, between the two intersections of the gap expanding portion 15 and the rotor outer peripheral circle 8 (between the first intersection 36a and the second intersection 36b). The width Wslit in the rotation direction is larger than the width W3 obtained by adding the width in the rotation direction of the innermost inner surface of the flange portion 14 and the distance in the rotation direction between the adjacent collar portions 14 by one, so that the width W3 of these two intersections When the center line in the rotation direction and the center line in the rotation direction of the flange portion 14 are on the same line, one of these two intersections (one of these two intersections) in the leakage magnetic flux path B via the flange portion 14 facing the gap expanding portion 15 ( For example, rather than the length L1 from the first intersection 36a) to the collar 14, the length L2 from one of these two intersections (for example, the first intersection 36a) to the adjacent collar 14 Therefore, the function of reducing the leakage magnetic flux via the flange portion 14 facing the gap expanding portion 15 can be obtained stronger than that of the first embodiment. As a result, the effect of improving the fundamental wave component of the no-load induced voltage shown in FIG. 14 is stronger than that of the first embodiment, and the output improving function of the rotary electric machine 1 can be obtained stronger than that of the first embodiment.

Embodiment 3.
FIG. 15 is an enlarged cross-sectional view of a gap enlarged portion of the rotary electric machine according to the third embodiment. Further, FIG. 16 is a cross-sectional view showing a path of magnetic flux created by the stator winding of the rotary electric machine according to the third embodiment. As shown in FIG. 15, the deepest portion 35 on the inner side in the radial direction of the gap expanding portion 15 is the rotation of two intersections (first intersection 36a and second intersection 36b) between the rotor outer circumference circle 8 and the gap expanding portion 15. When the direction center line and the rotation direction center line of the flange portion 14 are on the same line, the distance between the innermost inner surface of the collar portion 14 and the permanent magnet 9 is the shortest on the straight line C.

According to the rotary electric machine 1 of the third embodiment, the first intersection 36a and the second intersection 36a and the second deepest portion 35 on the radial inner side of the gap expanding portion 15 are two intersections of the gap expanding portion 15 and the rotor outer peripheral circle 8. When the rotation direction center line of the intersection point 36b and the rotation direction center line of the flange portion 14 are on the same line, the position is located on the straight line C where the distance between the innermost inner surface of the flange portion 14 and the permanent magnet 9 is the shortest. As shown in FIG. 16, in the magnetic flux path in which the magnetic flux generated by the stator winding 6 is output from the flange portion 14 and interlinks with the permanent magnet 9, the gap expanding portion is the portion where the magnetic resistance of this magnetic flux path is the smallest. Since the effect of providing the 15 at a predetermined position can be obtained to the maximum, the magnet demagnetization generated by the magnetic flux generated by the stator winding 6 interlinking the permanent magnets 9 can be obtained most effectively.

Embodiment 4.
FIG. 17 is a cross-sectional view for explaining the magnetic flux path of the magnet when the gap expansion portion of the rotary electric machine according to the fourth embodiment is excluded. Further, FIG. 18 is a cross-sectional view for explaining the shape of the gap expanding portion of the rotary electric machine according to the fourth embodiment. Furthermore, FIG. 19 is a diagram showing the effect of improving the no-load induced voltage by the gap expanding portion of the rotary electric machine according to the fourth embodiment.
According to the rotary electric machine 1 of the fourth embodiment, as shown in FIG. 18, in the pole where the rotor magnetic pole is the N pole and the pole where the rotor magnetic pole is the S pole, the gap expanding portion 15 and the rotor outer circumference circle The width in the rotation direction between the first intersection 36a and the second intersection 36b, which are the two intersections of 8, is different, and the width in the rotation direction of the gap expanding portion 15 is the south pole in the north pole. It is larger than the pole that becomes.

As shown in FIG. 17, the magnetic flux generated by the permanent magnet 9 is output from the magnet 2 side magnetic flux output surface of the permanent magnet 9 arranged on the magnetic pole where the rotor magnetic pole is the N pole, and is permanently passed through the stator 2. Since the magnet 9 is input to the axial magnetic flux output surface of the permanent magnet 9 arranged on the magnetic pole serving as the S pole, the leakage magnetic flux reducing function of the permanent magnet 9 by the gap expanding portion 15 is performed by the gap expanding portion on the N pole side. It is obtained more effectively at 15. As a result, as shown in FIG. 18, the width in the rotation direction between the two intersections of the gap expanding portion 15 and the rotor outer circumference circle 8 is larger at the north pole than at the south pole. According to the rotary electric machine 1 according to the fourth embodiment, the width of the gap expanding portion 15 in the rotation direction is larger in the pole that becomes the north pole than in the pole that becomes the south pole, so that the leakage flux reducing function of the permanent magnet 9 is achieved. The volume of the rotor core 7 reduced by the gap expanding portion 15 can be reduced while maintaining the above. As a result, the volume reduction amount of the rotor core 7 can be reduced. Therefore, as shown in FIG. 19, the fundamental wave component of the no-load induced voltage due to the asymmetry of the void expansion portion 15 at the north and south poles of the rotor magnetic pole. The effect of improving the above is effectively obtained, and the output of the rotary electric machine 1 is improved.

Embodiment 5.
FIG. 20 is a perspective view showing a rotary electric machine according to the fifth embodiment, and FIG. 21 is a cross-sectional view showing a rotor of the rotary electric machine according to the fifth embodiment. Further, FIG. 22 is a diagram showing an outline of the permanent magnet and the bobbin of the rotary electric machine according to the fifth embodiment. Further, FIG. 23A is an explanatory view of a magnetic flux path created by the rotor winding of the rotary electric machine according to the fifth embodiment, and FIG. 23B is an explanatory view of a magnetic flux path created by the permanent magnet of the rotary electric machine according to the fifth embodiment. It is a sectional view.

As shown in FIGS. 20 and 21, in the rotary electric machine 1 according to the fifth embodiment, the rotor 3 has a slip ring 17 on the rotary shaft 4 that receives power supplied from a brush (not shown), and has a connection terminal 19. It is connected to the rotor winding 20 via. The rotor 3 has a rotor winding 20 arranged in a magnet insertion hole 10 provided in the rotor core 7, and the rotor winding 20 has a surface different from the magnetic flux output surface of the permanent magnet 9. The rotor winding 20 and the void expansion portion 15 are wound through the bobbin 21 and are arranged on the leakage magnetic flux path of the permanent magnet 9 via the rotor core 7 and the bobbin 21. They are arranged so as to face each other in the vector direction orthogonal to D. Further, the rotary electric machine 1 in FIG. 20 includes a bearing 16 and a rotor 18 for a rotation position sensor.

According to the fifth embodiment, the rotor winding 20 is wound on a surface different from the magnetic flux output surface via the bobbin 21, so that the magnetic flux formed by energizing the rotor winding 20 is permanent. The magnetic flux generated by the magnet 9 can form the magnetic flux of the rotor winding 20 and the permanent magnet 9 in a direction in which they strengthen each other as shown in FIGS. 23A and 23B. Further, the rotor winding 20 and the void expanding portion 15 are arranged in the leakage flux path of the permanent magnet 9 via the rotor core 7 and the bobbin 21 in the vector direction orthogonal to the leakage flux vector D of the permanent magnet 9. By arranging them so as to face each other, as shown in FIGS. 23A and 23B, the permanent magnet 9 has a leakage flux reducing function, and the rotor winding 20 also has a magnetic leakage flux reducing function. Therefore, the output improving function of the rotary electric machine 1 can be effectively obtained by disposing the rotor winding 20.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Rotor, 2 Stator, 3 Rotor, 4 Rotor shaft, 5 Stator core, 6 Stator winding, 7 Rotor core, 8 Rotor outer circle, 9 Permanent magnet, 10 Magnet insertion hole, 11 Permanent magnet Magnetization direction, 12 1st joint iron part, 13 2nd joint iron part, 14 flange part, 15 void expansion part, 16 bearing, 17 slip ring, 18 rotor for rotation position sensor, 19 connection terminal, 20 rotor winding Wire, 21 bobbin, 30 battery, 31 power circuit, 32 AC generator, 33 control circuit, 34 finest, 35 deepest, 36a first intersection, 36b second intersection, 37 third intersection, 38 Fourth intersection

Claims (4)

A rotor having a rotor core attached to a rotating shaft and a permanent magnet mounted in an insertion hole of the rotor core,
A plurality of flange portions arranged so as to face each other on the outer peripheral surface of the rotor via a gap and formed radially inside facing the rotor, and extending from the plurality of flange portions and extending from the inside in the radial direction. A stator having a plurality of joints formed on the outer side in the radial direction,
A gap expanding portion, which is formed on the outer periphery of the rotor and expands the gap distance from the inner peripheral surface of the stator, is provided .
The gap expanding portion is a groove portion formed in the rotor core, and is directed from the first intersection and the second intersection, which are the intersections of the rotor outer peripheral circle and the gap expanding portion, toward the axial center of the rotating shaft. It is formed in a convex shape,
In the pole where the rotor magnetic pole is the north pole and the pole where the rotor pole is the south pole, the width in the rotation direction between the first intersection point and the second intersection point, which is the intersection point of the rotor outer circumference circle and the gap expansion portion. Is different,
A rotary electric machine characterized in that the width of the gap expanding portion in the rotation direction is larger at the north pole than at the south pole. The width in the rotation direction between the first intersection and the second intersection of the gap expanding portion is the distance in the rotation direction between the adjacent collar portions and the width in the rotation direction of the innermost inner surface of the collar portion. The rotary electric machine according to claim 1 , wherein the width is larger than the width summed by one. The deepest part on the inner side in the radial direction of the gap expanding portion is the rotation direction center line of the first intersection and the second intersection, which are two intersections of the gap expanding portion and the rotor outer circumference circle, and the flange portion. The first or second aspect of claim 1, wherein the center line in the rotation direction is located on a straight line where the distance between the innermost inner surface of the flange portion and the permanent magnet is the shortest when the center lines are on the same line. Rotating electric machine. The rotor has a rotor winding arranged in the insertion hole provided in the rotor core, and the rotor winding passes through a bobbin on a surface different from the magnetic flux output surface of the permanent magnet. A vector in which the rotor winding and the void expansion portion are wound and orthogonal to the leakage magnetic flux vector of the permanent magnet via the rotor core and the bobbin arranged on the leakage magnetic flux path of the permanent magnet. The rotary electric machine according to any one of claims 1 to 3 , wherein the rotary electric machine is arranged so as to face each other in the direction.

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