JP6862925B2 - Rotating machine - Google Patents

Description

The present invention relates to a hybrid field type rotary electric machine in which the rotor is a sequential pole type.

A rotary electric machine is known in which a stator and a rotor are opposed to each other and can function as a motor or a generator. In such a rotary electric machine, a motor including a sequential pole type rotor is known as described in Patent Documents 1 to 3. In this motor, in the rotor, poles mainly composed of an iron core and permanent magnets are alternately arranged in the circumferential direction.

Further, in the configuration described in Patent Document 3, in the rotor, the magnet magnetic pole portion in which the main magnet is embedded and the salient poles of the rotor core are alternately arranged in the circumferential direction, and the salient poles and the magnet magnetic pole portion are located between the salient poles. A void is formed. Further, an auxiliary magnet having a bridge shape is arranged so as to close the outer diameter side portion of the gap. A part of the magnetic flux generated from the auxiliary magnet passes through the radial outside of the rotor or the radial inside of the gap. At this time, the magnetic flux generated from the auxiliary magnet magnetically saturates a predetermined region R from the connecting portion arranged at the circumferential end of the main magnet in the rotor core. It is said that this reduces the leakage flux generated from the main magnet, and the magnetic flux of the main magnet can effectively contribute to the generation of motor torque. Here, the leakage flux is a magnetic flux generated from the main magnet but not directed to the opposing stator, and does not contribute to the motor torque.

On the other hand, in a motor including a concave pole type rotor and a stator including a field winding, a configuration is also known in which a direct current is passed through the field winding to magnetize the salient pole portion of the rotor. This configuration is called a hybrid field motor.

For example, Patent Document 4 describes a rotary electric machine including a core portion having an annular stator, two field windings, and a three-phase armature winding. The two field windings are fixed at both ends in the axial direction of the core portion. The three-phase armature winding passes through a slot between a plurality of radial teeth protruding inward in the radial direction of the core portion and a slot between a plurality of axial teeth protruding outward in the axial direction at both ends in the axial direction of the core portion. Then, it is toroidally wound around the core. The rotor includes a radial rotor portion that is arranged to face the stator in the radial direction and an axial rotor portion that is arranged to face the stator in the direction parallel to the rotation axis.

When a direct current flows through the field winding, a field magnetic flux is generated through the radial rotor portion and the axial rotor portion of the rotor and the core portion of the stator. An alternating current flows through the armature winding to generate a magnetic field that interacts with the field magnetic flux. The radial rotor portion includes a radial magnetic pole portion corresponding to a salient pole portion that is magnetized by a direct current flowing through the field winding. The axial rotor portion is arranged so as to be offset from the radial magnetic pole portion in the circumferential direction around the rotation axis of the rotor, and the axial magnetic pole portion magnetizes to the opposite polarity to the radial magnetic pole portion when a direct current flows through the field winding. including.

Further, in Patent Document 5, in order to control the field magnetic flux, the stator core is divided into two in the axial direction to form an N-pole side core and an S-pole side core, and the outer peripheral side thereof is magnetically and magnetically provided by an annular yoke. A rotating electric machine that is mechanically connected is described. An annular field winding is sandwiched between the N-pole side core and the S-pole side core and is provided along the axial direction. The armature winding is provided on the stator core so as to straddle the north pole side core and the south pole side core. On the rotor core, north pole magnets and north pole salient poles are alternately arranged in the circumferential direction so as to face the north pole side core. Further, on the rotor core, S pole magnets and S pole salient poles are alternately arranged in the circumferential direction so as to face the S pole side core.

As in the configurations described in Patent Document 4 and Patent Document 5, in the hybrid field type rotary electric machine, the torque can be increased by passing a field current through the field winding with respect to the magnet torque generated by the magnet. there is a possibility. Here, the torque that increases when a field current is passed through the field winding is defined as the field current torque. At this time, the maximum torque of the hybrid field type rotary electric machine is the sum of the magnet torque and the field current torque, and is larger than the maximum torque of the rotary electric machine provided with the sequential pole type rotor but not the hybrid field type. There is a possibility that it can be increased.

Japanese Unexamined Patent Publication No. 2004-357489 Japanese Unexamined Patent Publication No. 9-327139 Japanese Unexamined Patent Publication No. 2012-105480 Japanese Unexamined Patent Publication No. 2010-226808 Japanese Unexamined Patent Publication No. 6-351206

Even in the hybrid field type, in a rotary electric machine provided with a sequential pole type rotor, the magnetic flux that should be directed from the magnet portion of the rotor toward the stator may be short-circuited without facing the stator. As a result, there is room for improvement in terms of increasing the maximum torque of the rotary electric machine. On the other hand, it is conceivable that the hybrid field type configuration described in Patent Document 4 and Patent Document 5 is combined with the configuration of the rotor with an auxiliary magnet described in Patent Document 3. In this configuration, the bridge portion covering the circumferential end face of the main magnet is magnetically saturated to reduce the short-circuit magnetic flux of the main magnet, so that the maximum torque may be increased. However, in that case, the cost of the rotary electric machine increases due to the addition of the auxiliary magnet.

An object of the present invention is to increase the maximum torque in a hybrid field type rotary electric machine provided with a sequential pole type rotor without adding an auxiliary magnet.

The rotary electric machine according to one aspect of the present invention includes a rotor and a stator arranged so as to face the outer sides in the radial direction of the rotor, and the rotor projects radially at a plurality of positions in the circumferential direction of the annular portion. A rotor core made of a magnetic material on which a pole is formed and a magnet portion of the same pole arranged at a plurality of positions in the circumferential direction are included, and the magnet portion and the salient pole portion are alternately arranged in the circumferential direction on the outer periphery. It is a concave pole type that is arranged, and the stator is a field winding that passes a DC current that creates a field in the rotor, and an armature that passes an AC current to generate torque by interacting with the field. A hybrid field type rotary electric machine including a winding, the magnet portion includes a magnet, an outer magnetic material portion that covers the radial outer side of the magnet, a circumferential end of the outer magnetic material portion, and the said. It has a bridge portion made of a magnetic material connecting the salient poles, and a first straight line in the radial direction passing through the circumferential center of the magnet and a second straight line in the radial direction passing through the circumferential center of the salient pole portion. With reference to the reference line, which is a line extending in the radial direction by dividing the angle formed into two equal parts, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion is the bridge portion. The magnet side portion is located radially inside the portion located at the innermost end in the radial direction of the rotor, and the salient pole side portion of the bridge portion has a circumferential portion extending in the circumferential direction of the rotor. , A rotating electric machine in which an inclined portion inclined inward in the radial direction with respect to the circumferential direction is connected to the end of the salient pole portion side of the circumferential direction portion. The rotary electric machine according to one aspect of the present invention includes a rotor and a stator arranged so as to face the outer sides in the radial direction of the rotor, and the rotor projects radially at a plurality of positions in the circumferential direction of the annular portion. A rotor core made of a magnetic material on which a pole is formed and a magnet portion of the same pole arranged at a plurality of positions in the circumferential direction are included, and the magnet portion and the salient pole portion are alternately arranged in the circumferential direction on the outer periphery. It is a concave pole type that is arranged, and the stator is a field winding that passes a DC current that creates a field in the rotor, and an armature that passes an AC current to generate torque by interacting with the field. A hybrid field type rotary electric machine including a winding, the magnet portion includes a magnet, an outer magnetic material portion that covers the outer side in the radial direction of the magnet, a circumferential end of the outer magnetic material portion, and the said. The rotor has a bridge portion made of a magnetic material connecting the salient pole portions, and the rotor has a magnet-side end portion of the bridge portion and an outer peripheral surface or the salient pole portion at a position different from the salient pole portion of the rotor core. The bridge portion, the salient pole portion, and the beam portion that is surrounded by the magnets and partitions the space penetrating in the axial direction are included, and the magnet side joint point of the beam portion is the salient pole side joint. It is a rotating electric machine located outside the point in the radial direction. The rotary electric machine according to one aspect of the present invention includes a rotor and a stator arranged so as to face the outer sides in the radial direction of the rotor, and the rotor projects radially at a plurality of positions in the circumferential direction of the annular portion. A rotor core made of a magnetic material on which a pole is formed and a magnet portion of the same pole arranged at a plurality of positions in the circumferential direction are included, and the magnet portion and the salient pole portion are alternately arranged in the circumferential direction on the outer periphery. It is a concave pole type that is arranged, and the stator is a field winding that passes a DC current that creates a field in the rotor, and an armature that passes an AC current to generate torque by interacting with the field. A hybrid field type rotary electric machine including a winding, the magnet portion includes a magnet, an outer magnetic material portion that covers the outer side in the radial direction of the magnet, a circumferential end of the outer magnetic material portion, and the said. It has a bridge portion made of a magnetic material connecting the salient pole portions, and the stator is formed at a plurality of positions in the circumferential direction of the annular stator core, the teeth protruding inward in the radial direction, and the adjacent teeth. The bridge portion includes a slot formed between them, and the bridge portion has a dip portion that is depressed inward in the radial direction of the rotor, and among the tips of the salient pole portions, a bridge portion side end in the circumferential direction and the depression portion. The first angle, which is the central angle of the circumferential length of the portion with respect to the magnet side end with respect to the rotation center of the rotor, is the central angle of the width of the slot in the circumferential direction of the stator with respect to the center of the stator. It is a rotating electric machine with two or more angles.

According to the present invention, in a hybrid field type rotary electric machine provided with a sequential pole type rotor, the maximum torque can be increased without adding an auxiliary magnet.

It is sectional drawing which shows the rotary electric machine of embodiment of this invention. It is a perspective perspective view of the rotor which constitutes the rotary electric machine shown in FIG. It is a figure which omits a part in the AA cross section of FIG. 1 and shows a part in a circumferential direction. It is an enlarged view of the part corresponding to the rotor of FIG. It is a circuit diagram of the rotary electric machine control system including the rotary electric machine shown in FIG. In the embodiment, it is a partially enlarged corresponding view of FIG. 3 which shows the magnetic flux generated from a magnet (magnet magnetic flux) and the magnetic flux generated by a field current (field current magnetic flux). It is a figure corresponding to FIG. 4 of the rotor which comprises the rotary electric machine of the comparative example. In the comparative example, it is a figure corresponding to FIG. 6 which shows the magnetic flux generated from a magnet (magnet magnetic flux) and the magnetic flux generated by a field current (field current magnetic flux). It is a figure which shows the relationship of the maximum torque obtained by calculation in the Embodiment (Example 1) shown in FIG. 1 and the comparative example shown in FIG. 7. It is a figure corresponding to FIG. 7 which shows the rotor which comprises the rotary electric machine of another example of embodiment of this invention. It is a figure corresponding to FIG. 7 which shows the rotor which comprises the rotary electric machine of another example of embodiment of this invention. It is a figure which shows the relationship of the maximum torque obtained by calculation in the embodiment (Example 1, 2, 3) shown in FIG. 1, FIG. 10, and FIG. 11 and the comparative example shown in FIG. 7. It is a figure corresponding to FIG. 7 which shows the rotor which comprises the rotary electric machine of another example of embodiment of this invention. It is a figure which shows 3 examples of the rotary electric machine of another example of embodiment of this invention, and the maximum torque in 3 examples. In the rotary electric machine shown in FIG. 1, it is a partially enlarged corresponding view of FIG. 3 for explaining the possibility that the magnetic flux (armature current magnetic flux) generated by energization of the armature winding of the stator may be short-circuited. FIG. 3 is a partially enlarged equivalent view of FIG. 3 in another rotary electric machine according to the embodiment of the present invention. FIG. 3 is a partially enlarged equivalent view of FIG. 3 in another rotary electric machine according to the embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The shapes, materials, numerical values, quantities, etc. described below are examples for explanation and can be appropriately changed according to the specifications of the rotary electric machine and the like. Further, in the following, the same elements will be described with the same reference numerals in all the drawings. In the following, the case where the rotary electric machine is a motor will be described, but the rotary electric machine may be a generator or a motor generator having both functions of a motor and a generator.

FIG. 1 is a cross-sectional view showing the rotary electric machine 10 of the embodiment. FIG. 2 is a perspective perspective view of the rotor 12 constituting the rotary electric machine 10. FIG. 3 is a diagram showing a part in the circumferential direction by omitting a part in the AA cross section of FIG. FIG. 4 is an enlarged view of a portion corresponding to the rotor 12 of FIG.

The rotary electric machine 10 shown in FIGS. 1 to 4 is a hybrid field type motor including a concave pole type rotor 12 and a stator 50 including a field winding, similar to the configuration described in Patent Document 5. is there. Specifically, the rotary electric machine 10 includes a rotor 12 fixed to a non-magnetic shaft 100 and a stator 50 arranged so as to face the outer side in the radial direction of the rotor 12. The shaft 100 is rotatably supported by bearings with respect to a casing (not shown).

The rotor 12 includes a rotor yoke 13 made of an annular magnetic material, a rotor core 14 made of a magnetic material fixed to the outer peripheral side of the rotor yoke 13, a plurality of N-pole magnet portions 25n having the same pole, and a plurality of S-pole magnets having the same pole. Includes parts 25s. The rotor core 14 has an annular portion 15 having a cylindrical outer peripheral surface, a plurality of first salient pole portions 16, and a plurality of second salient pole portions 18. The plurality of first salient pole portions 16 are formed so as to project outward in the radial direction at equal intervals at a plurality of positions in the circumferential direction of the outer peripheral surface of the annular portion 15 on one side in the axial direction (left side in FIG. 1). The plurality of second salient pole portions are formed so as to project outward in the radial direction at equal intervals at a plurality of positions in the circumferential direction of the outer peripheral surface of the annular portion on the other side in the axial direction (right side in FIG. 1). For example, the rotor core 14 is formed of a laminated steel plate. Further, as shown in FIG. 2, a protruding portion 19 projecting in the radial direction and long in the axial direction is formed at a position corresponding to the first salient pole portion 16 on the inner peripheral surface of the rotor core 14. Each protrusion 19 engages with axially long grooves 13a formed at a plurality of positions on the outer peripheral surface of the rotor yoke 13. Since both ends of each groove portion 13a in the axial direction reach the axial end faces of the rotor yoke 13, the rotor core 14 can be fitted and coupled to the rotor yoke 13 in the axial direction.

Further, the plurality of N-pole magnet portions 25n have a plurality of N-pole magnets 26n and a plurality of N-side bridge members 27n. The plurality of N-pole magnets 26n are fixed one by one between the adjacent first salient poles 16 on the outer peripheral surface of the rotor core 14 on one side (left side in FIG. 2) in the axial direction. As a result, the first salient pole portion 16 and the north pole magnet 26n are alternately arranged in the circumferential direction of the rotor core 14. The N-pole magnet 26n has an arc-shaped cross section and is long in the axial direction. The N-pole magnet 26n is magnetized so that the outer surface is the N-pole and the inner surface is the S-pole.

As shown in FIG. 4, the plurality of N-side bridge members 27n are made of a magnetic material having an arc-shaped cross section and long in the axial direction. The N-side bridge member 27n is fixed to the radial outer surface of the N-pole magnet 26n so as to cover the N-pole magnet 26n at the central portion in the circumferential direction.

The plurality of S pole magnet portions 25s have a plurality of S pole magnets 26s and a plurality of S side bridge members 27s. The plurality of S pole magnets 26s are fixed one by one between the adjacent second salient poles 18 on the outer peripheral surface of the rotor core 14 on the other side (right side in FIG. 2) in the axial direction. As a result, the second salient pole portion 18 and the S pole magnet 26s are alternately arranged in the circumferential direction of the rotor core 14. The S pole magnet 26s has an arc-shaped cross section and is long in the axial direction. The S pole magnet 26s is magnetized so that the outer surface is the S pole and the inner surface is the N pole.

The plurality of S-side bridge members 27s are made of a magnetic material having an arc-shaped cross section and long in the axial direction. The S-side bridge member 27s is fixed to the radial outer surface of the S-pole magnet 26s so as to cover the S-pole magnet 26s at the central portion in the circumferential direction.

As shown in FIG. 2, the N-pole magnet 26n and the second salient pole portion 18 are arranged side by side with a gap in the axial direction. The S pole magnet 26s and the first salient pole portion 16 are arranged side by side with a gap in the axial direction. The north pole magnet 26n, the south pole magnet 26s, the first salient pole portion 16, and the second salient pole portion 18 have substantially the same length in the axial direction.

The tip surfaces of the salient poles 16 and 18 are located outside the radial outer surfaces of the N-pole magnet 26n and the S-pole magnet 26s, respectively. The radial direction refers to the radial direction of the rotor 12 unless otherwise specified. The circumferential direction means the circumferential direction of the rotor 12, and the axial direction means the axial direction of the rotor 12.

Both ends of the plurality of bridge members 27n and 27s in the circumferential direction are fixed to the salient poles 16 and 18 in a state of being abutted against the side surfaces in the circumferential direction near the tips of the salient poles 16 and 18 on the corresponding sides. The tip surfaces of the salient poles 16 and 18, the outer surface of the N-side bridge member 27n, and the outer surface of the S-side bridge member 27s are curved surfaces having an arc-shaped cross section centered on the rotation center of the rotor 12, respectively. is there. Further, the outer surfaces of the bridge members 27n and 27s and the tip surfaces of the salient poles 16 and 17 are located on the cylindrical surface.

Each of the bridge members 27n and 27s has an outer magnetic material portion 28 (FIG. 4) and a magnetic material bridge portion 29. The outer magnetic material portion 28 is a portion that comes into contact with the radial outer surface of the N-pole magnet 26n or the S-pole magnet 26s and covers the radial outer side of the magnets 26n and 26s. The bridge portion 29 is a portion of the bridge members 27n and 27s that connects the circumferential end of the outer magnetic material portion 28 and the first and second salient pole portions 16 and 18. In FIG. 4, the bridge portion 29 is shown as a sandy portion for the sake of clarity. As a result, the magnet portions 25n and 25s are arranged at a plurality of positions in the circumferential direction of the rotor 12. Further, the rotor 12 is arranged so that the N-pole magnet portion 25n and the first salient pole portion 16 are alternately arranged in the circumferential direction on the outer circumference on one side in the axial direction. Further, the rotor 12 is arranged so that the S pole magnet portion 25s and the second salient pole portion 18 are alternately arranged in the circumferential direction on the outer circumference on the other side in the axial direction. Further, the bridge portion 29, including the magnet side portion, is located at the outermost end position in the radial direction of the rotor 12, and is arranged along the circumferential direction. The radial thickness of the bridge portion 29 and the radial thickness of the outer magnetic material portion 28 are substantially the same. By forming the bridge portion 29 on the rotor 12, the outer peripheral portion of the rotor 12 is surrounded by magnets 26n, 26s, the bridge portion 29, and the first and second salient pole portions 16, 18 and penetrates in the axial direction. Space 40 is formed.

As described above, since the rotor 12 has the bridge portion 29 connecting the circumferential end of the outer magnetic material portion 28 and the first and second salient pole portions 16 and 18, as described later, without adding an auxiliary magnet. , The maximum torque of the rotary electric machine 10 can be increased.

As shown in FIG. 1, the stator 50 is made of an axially separated magnetic material and has an annular first stator core 51 and a second stator core 52, a stator yoke 60, an armature winding 61, and a field winding 62. including. For example, each of the stator cores 51 and 52 is formed of a laminated steel plate. The stator yoke 60 is made of a magnetic material and has an annular shape, and is fixed so as to hang over the outer diameter side of the first stator core 51 and the second stator core 52. As a result, the stator yoke 60 is magnetically coupled to the stator cores 51 and 52, respectively.

As shown in FIG. 3, teeth 53 projecting inward in the radial direction are formed at a plurality of positions in the circumferential direction of the inner peripheral surface of the first stator core 51, and slots 54 are formed between adjacent teeth 53. The radius. A tooth 53 (FIG. 1) and a slot are also formed in the second stator core 52 in the same manner as in the first stator core 51.

The armature winding 61 includes a U-phase winding, a V-phase winding, and a W-phase winding. Each of the U-phase winding, the V-phase winding, and the W-phase winding is a distributed winding or a concentrated winding, and is formed on each of the stator cores 51 and 52 so as to straddle the first stator core 51 and the second stator core 52. It is wound around the teeth 53.

The field winding 62 is used to pass a direct current that creates a field through the rotor 12. The field winding 62 is fixed in an insulated state between the first stator core 51 and the second stator core 52 in the axial direction. Further, the field winding 62 is formed by winding a lead wire in one layer or a plurality of phases in the radial direction. When wound in multiple phases, those wound multiple times in the radial direction are continuous in the axial direction. Such a field winding 62 has a ring shape as a whole and has a sufficient number of turns. The field winding 62 is arranged at substantially the same position in the axial direction with respect to the axial gap between the first salient pole portion 16 and the N pole magnet 26n and the second salient pole portion 18 and the S pole magnet 26s. .. The armature winding 61 is used to pass an alternating current for generating torque by interacting with the field of the rotor 12.

FIG. 5 is a circuit diagram of a rotary electric machine control system 110 including a rotary electric machine 10. The rotary electric machine control system 110 includes a DC power supply 112, a rotary electric machine 10, a first drive circuit 113, a second drive circuit 114, and a control device 115. The rotary electric machine 10 is driven by the first drive circuit 113 and the second drive circuit 114. The control device 115 controls the first drive circuit 113 and the second drive circuit 114.

Specifically, the first drive circuit 113 and the second drive circuit 114 are connected in parallel with the DC power supply 112. The first drive circuit 113 is composed of a full bridge circuit including a first arm A1 and a second arm A2 connected in parallel. Further, two switching elements S1 and S2 (or S3 and S4) are connected in series to each of the arms A1 and A2, and a current in a direction opposite to the current direction of each switching element flows through both ends of each switching element. The diodes are connected in parallel. One end of the field winding 62 is connected to the midpoint between the switching elements S1 and S2 of the first arm A1, and the other end of the field winding 62 is in the middle between the switching elements S3 and S4 of the second arm A2. Connected to a point. Further, the magnitude of the positive field current can be controlled by switching control of the switching element S1 on the positive side of the first arm A1 and the switching element S4 on the negative side of the second arm A2. On the other hand, the magnitude of the negative field current can be controlled by switching control of the switching element S2 on the negative side of the first arm A1 and the switching element S3 on the positive side of the second arm A2. As a result, the first drive circuit 113 controls the current of the field winding 62 by switching. When a positive field current flows through the field winding 62, the field strengthening described later is performed, and when a negative field current flows, the field weakening described later is performed.

On the other hand, the second drive circuit 114 is a three-phase inverter. Specifically, the second drive circuit 114 includes a U-phase arm B1, a V-phase arm B2, and a W-phase arm B3 connected in parallel. Further, two switching elements Sa and Sb are connected in series to each of the arms B1, B2 and B3, and a current in a direction opposite to the current direction of each switching element flows through both ends of each switching element Sa and Sb. A diode is connected in parallel to the. In FIG. 1, the U-phase winding, the V-phase winding, and the W-phase winding are designated by u, v, and w, respectively. The second drive circuit 114 controls the current of the three-phase armature winding 61 by switching. In FIG. 1, the armature winding 61 of each phase is shown in a simplified manner, and only one is used in each phase. However, in reality, a plurality of windings are connected in series in each phase.

One end of the U-phase winding is connected to the midpoint between the switching elements Sa and Sb of the U-phase arm B1. One end of the V-phase winding is connected to the midpoint between the switching elements Sa and Sb of the V-phase arm B2. One end of the W-phase winding is connected to the midpoint between the switching elements Sa and Sb of the W-phase arm B3. The other ends of the U-phase winding, the V-phase winding and the W-phase winding are commonly connected at the neutral point G.

The control device 115 controls the switching of the first drive circuit 113 and the second drive circuit 114. The control device 115 generates a switching command signal based on the generated or input torque command, and controls the switching of the second drive circuit 114 by the command signal. Further, the control device 115 performs switching control of the first drive circuit 113 so as to perform the corresponding field control based on the satisfaction of one of the preset strong field control condition and the weak field control condition.

In the case of strengthening the field control of the rotary electric machine 10, the field current magnetic flux, which is the magnetic flux generated by the DC current flowing through the field winding 62, is the magnetic flux generated by the magnet, as in the configuration described in Patent Document 5. The direction is opposite to that of a certain magnetic flux and the magnetic path connecting the stator and rotor. Specifically, the magnetic flux of the magnet is generated from the N-pole magnet 26n. At this time, the magnetic flux from the N-pole magnet 26n is the gap between the stator and the rotor → the first stator core 51 → the stator yoke 60 → the second stator core 52 → the gap → the S pole magnet 26s → the rotor core 14 → the rotor yoke 13 → the rotor core 14 → It flows in the order of N pole magnets. On the other hand, the field current magnetic flux is applied in the order of the first stator core 51 → gap → first salient pole 16 → rotor core 14 → rotor yoke 13 → rotor core 14 → second salient pole 18 → gap → second stator core 52 → stator yoke 60. It flows. As a result, considering the combined magnetic flux on the rotor surface, the magnetic flux generated from the N-pole magnet 26n enters the first salient pole portion 16 adjacent to each other in the circumferential direction. Further, the magnetic flux generated from the second salient pole portion 18 enters the S pole magnets 26s adjacent to each other in the circumferential direction. As a result, the field magnetic flux can be increased equivalently, so that the maximum torque of the rotary electric machine 10 can be improved.

On the other hand, when the rotary electric machine 10 is weakened and field-controlled, a direct current is passed through the field winding 62 in the direction opposite to that when the field-strengthening control is performed.

Further, according to the rotary electric machine 10, the rotor 12 has a bridge portion 29 (FIG. 4) connecting the circumferential end of the outer magnetic material portion 28 and the first and second salient pole portions 16 and 18. It is possible to suppress a magnetic flux short circuit of the magnet via the bridge portion 29. FIG. 6 is a partially enlarged equivalent view of FIG. 3 showing a magnetic flux (magnet magnetic flux) generated from the n-pole magnet 26n and a magnetic flux (field current magnetic flux) generated by the field current in the embodiment. In FIG. 6, the solid line arrow indicates the magnet magnetic flux, and the broken line arrow indicates the field current magnetic flux. Further, in FIG. 6, the armature winding is not shown. Hereinafter, the flow of magnetic flux with respect to the n-pole magnet 26n and the first salient pole portion 16 will be mainly described. In the following, the n-pole magnet 26n may be referred to as a magnet 26n, and the first salient pole portion 16 may be referred to as a salient pole portion 16.

When the field strengthening is performed as shown in FIG. 6, the field current magnetic flux emitted from the tip of the teeth 53 of the stator 50 flows toward the salient pole portion 16 as shown by the broken line arrow. On the other hand, as shown by the solid line arrow, the magnetic flux of the magnet exits from the magnet 26n and heads toward the teeth 53, but a part of the magnetic flux of the magnet is a path having a small magnetic resistance from the outer magnetic material portion 28 to the bridge portion 29 and the salient pole. It tends to be short-circuited via the portion 16. At this time, at the base portion of the bridge portion 29 on the salient pole portion 16 side (the portion surrounded by the circle P1 in FIG. 6), the field current magnetic flux indicated by the broken line arrow also tries to flow in the portion where the cross-sectional area of the bridge portion 29 is small. Therefore, the magnetic saturation of the bridge portion 29 is promoted. Therefore, the leakage flux generated from the magnet 26n and short-circuited without passing through the stator 50 is reduced. As a result, the magnetic flux from the magnet 26n toward the stator 50 increases, and the maximum torque can be further increased. Further, according to the configuration of this example, unlike the configuration described in Patent Document 3, it is not necessary to add an auxiliary magnet between the magnet and the salient pole portion in order to increase the torque, so that it is easy to reduce the cost. ..

FIG. 7 is a diagram corresponding to FIG. 4 of the rotor 12a constituting the rotary electric machine of the comparative example. Unlike the embodiments of FIGS. 1 to 6, the rotor 12a of the comparative example shown in FIG. 7 includes a configuration described in Patent Document 3 without an auxiliary magnet. Specifically, on the outer peripheral portion of the rotor 12a, a magnet holding portion 116 made of a magnetic material having a magnet hole 117 penetrating in the axial direction is formed between the salient pole portions 16 adjacent to each other in the circumferential direction. The magnet holding portion 116 includes two side wall portions 118 at both ends in the circumferential direction and an outer peripheral connecting portion 119 connected to the radial outer ends of the side wall portions 118, which are integrally connected to the annular portion of the rotor core 14. The magnet hole 117 is formed by a portion surrounded by two side wall portions 118 and an outer peripheral connecting portion 119. Then, the magnet 26n is inserted into the magnet hole 117 and fixed. Further, in the comparative example, the bridge portion connecting the outer peripheral connecting portion 119 and the salient pole portion 16 is not formed. Other configurations are the same as those of FIGS. 1 to 6.

In such a comparative example, the short-circuit magnetic flux from the magnet 26n increases, so that the torque increasing effect becomes low. The inconvenience of this comparative example will be described with reference to FIG. FIG. 8 is a diagram corresponding to FIG. 6 showing the magnetic flux of the magnet and the magnetic flux of the field current in the comparative example. The meanings of the solid line arrow and the broken line arrow in FIG. 8 are the same as those in FIG.

As shown in FIG. 8, in the comparative example, the magnet magnetic flux indicated by the solid arrow flows along the side wall portion 118 of the magnet holding portion 116 and is short-circuited. In this case, since the field current magnetic flux indicated by the broken line arrow does not easily reach the side wall portion 118 of the magnet holding portion 116, the magnetic flux saturation of the magnet holding portion 116 is not promoted. Therefore, the short-circuit magnetic flux of the magnet 26n increases, so that the torque increasing effect is reduced.

Further, in the configurations of FIGS. 1 to 6, the portion of the bridge portion 29 including the magnet side portion is located at the outermost end position in the radial direction of the rotor 12. As a result, both the leakage magnetic flux from the magnet 26n and the field current magnetic flux due to the energization of the field winding 62 can easily pass through the portion including the magnet side portion of the bridge portion 29, and the magnetic flux saturation at the bridge portion 29 becomes high. More promoted. As a result, the torque increasing effect can be further enhanced.

Further, in the configurations of FIGS. 1 to 6, since the bridge portion 29 connecting the outer magnetic material portion 28 and the salient pole portion 16 is provided, the unevenness of the outer peripheral surface of the rotor 12 is reduced, so that the rotor 12 is rotated. Loss due to air resistance can be reduced. In particular, when the entire bridge portion 29 is along the circumferential direction as in the configurations of FIGS. 1 to 6, the unevenness of the outer peripheral surface of the rotor 12 can be eliminated, so that the loss due to air resistance can be further reduced.

FIG. 9 is a diagram showing the relationship between the maximum torques obtained by calculation in the embodiment (Example 1) shown in FIGS. 1 to 6 and the comparative example shown in FIG. 7. The vertical axis of FIG. 9 shows the maximum torque of the rotary electric machine as a relative value in a dimensionless unit (p.u.). As is clear from FIG. 9, in the case of the embodiments shown in FIGS. 1 to 6, the maximum torque can be increased as compared with the comparative example.

FIG. 10 is a diagram corresponding to FIG. 7 showing a rotor 12b constituting another rotary electric machine of the embodiment. In the configuration of FIG. 10, unlike the configurations of FIGS. 1 to 6, the bridge portion 29a is inclined inward in the radial direction with respect to the circumferential direction from the outer magnetic material portion side end to the salient pole portion side end. Then, the innermost position of the bridge portion 29a in the radial direction is coupled to the circumferential side surface of the salient pole portion 16. As a result, in the configuration of FIG. 10, the portion located at the innermost end in the radial direction of the rotor 12b in the salient pole side portion of the bridge portion 29a with reference to the reference line D1 described later is the radial direction in the bridge portion 29a. It is located at the innermost end of. Here, the reference line D1 divides the angle formed by the radial first straight line C1 passing through the circumferential center of the magnet 26n and the radial second straight line C2 passing through the circumferential center of the salient pole portion 16 into two equal parts. It is a line extending in the radial direction. Therefore, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion 29a is more radial than the portion located at the innermost end in the radial direction of the rotor portion in the magnet side portion of the bridge portion 29a. Located inside. In FIG. 10, a circle S passing through the outermost radial end of the rotor 12b and having the rotation center O of the rotor as the center is also shown. In the configuration shown in FIG. 10, since the bridge portion 29a is formed as described above, the bridge portion 29a has a depressed portion that is depressed inward in the radial direction.

According to the above configuration, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion 29a with reference to the reference line D1 is the portion in the radial direction of the rotor in the magnet side portion of the bridge portion 29a. It is located inward in the radial direction from the part located at the innermost end of. According to this configuration, when a centrifugal force acts on the magnet 26n when the rotor 12b rotates, the force that causes the bridge portion 29a to deform with the base portion (the portion surrounded by the circle P2 in FIG. 10) as the fulcrum. Works. As a result, unlike the case where the fulcrum is located at the outermost end position in the radial direction of the rotor 12 as in the configurations of FIGS. 1 to 6, the bridge portion 29a is less likely to be deformed, and the mechanical strength of the rotor 12b can be increased. Other configurations and operations are the same as those of FIGS. 1 to 6.

FIG. 11 is a diagram corresponding to FIG. 7 showing a rotor 12c constituting another rotary electric machine of the embodiment. In the configuration of FIG. 11, unlike the configuration of FIG. 10, the bridge portion 29b has a circumferential portion 30 formed in a portion including the entire magnet side portion with reference to the reference line D1 and extending along the circumferential direction. It has an inclined portion 31 connected to the direction portion 30. The inclined portion 31 is bent in the circumferential direction portion 30 from one end located near the reference line D1 and is inclined inward in the radial direction with respect to the circumferential direction toward the salient pole portion side. The inclined portion 31 forms a depressed portion 32 that is depressed inward in the radial direction of the bridge portion 29b. As a result, also in the case of the configuration of FIG. 11, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion 29b with reference to the reference line D1 is the same as the configuration of FIG. , Located at the innermost end of the bridge portion 29b in the radial direction. Therefore, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion 29b is more radial than the portion located at the innermost end in the radial direction of the rotor portion in the magnet side portion of the bridge portion 29b. Located inside. Further, of the bridge portion 29b, all of the magnet-side portions with reference to the reference line D1 extend along the circumferential direction, and all of the magnet-side portions are at the outermost positions of the rotor 12c in the radial direction. ..

In the above configuration, the mechanical strength of the rotor 12c can be increased as compared with the configurations of FIGS. 1 to 6 for the same reason as the configuration of FIG. In addition to this, in the above configuration, unlike the configuration of FIG. 10, since the entire magnet side portion of the bridge portion 29b is located at the outermost end position in the radial direction of the rotor 12c, the entire magnet side portion and the entire magnet side portion thereof. The radial gap between the stator 50 (FIG. 3) and the tip of the teeth 53 (FIG. 3) is minimized. Therefore, in the configuration of FIG. 11, the torque increasing effect can be increased as compared with the configuration of FIG. Other configurations and operations are the same as those of FIGS. 1 to 6 or 10. In the configuration of FIG. 11, the portion extending in the circumferential direction of the bridge portion 29 may be located not at the outermost position in the radial direction of the rotor, but may be located slightly inward in the radial direction from the outermost end position. Even in that case, the torque increasing effect can be increased as compared with the configuration of FIG.

FIG. 12 is a diagram showing the relationship between the maximum torques obtained by calculation in the embodiments (Examples 1, 2, and 3) shown in FIGS. 1, 10, and 11 and the comparative examples shown in FIG. 7. The meaning of the vertical axis in FIG. 12 is the same as in the case of FIG. Example 2 corresponds to the embodiment shown in FIG. 10, and Example 3 corresponds to the embodiment shown in FIG. As can be seen from the relationship of the maximum torque in FIG. 12, the maximum torque is determined in the order of the embodiment (Example 1) of FIG. 1, the embodiment (Example 3) of FIG. 11, and the embodiment (Example 2) of FIG. It was high and was the smallest in the comparative example of FIG. On the other hand, the mechanical strength of the rotor increases in the order of Example 2, Example 3, and Example 1.

FIG. 13 is a diagram corresponding to FIG. 7 showing a rotor 12d constituting another rotary electric machine of the embodiment. In the configuration of FIG. 13, unlike the configuration of FIG. 10, the cross section of the magnet 26n is substantially rectangular. Further, the outer magnetic material portion 28a has a substantially rectangular cross-sectional shape extending in a direction orthogonal to the radial direction in accordance with the outer magnetic material portion 28a. Magnet-side ends 33 of the bridge portion 29c are connected to both ends of the outer magnetic material portion 28a in the circumferential direction, and the thickness of the magnet-side ends 33 thereof is substantially the same as the thickness of both ends of the outer magnetic material portion 28a in the circumferential direction. is there. The bridge portion 29c has a magnet side end portion 33, a first circumferential direction portion 34, a second circumferential direction portion 35, and an inclined portion 36. The first circumferential direction portion 34 is connected to the outermost peripheral position of the circumferential end of the magnet side end portion 33, the thickness in the radial direction is reduced, and the first circumferential direction portion 34 extends in the circumferential direction. The second circumferential direction portion 35 is formed on the salient pole side portion of the bridge portion 29c and extends in the circumferential direction. The first circumferential direction portion 34 and the second circumferential direction portion 35 are connected by an inclined portion 36 inclined with respect to the circumferential direction. The first circumferential direction portion 34 is located at the outermost position in the radial direction of the rotor, and the second circumferential direction portion 35 is located inside the first circumferential direction portion 34 in the radial direction of the rotor. The inclined portion 36 and the second circumferential direction portion 35 form a depressed portion 37 that is depressed inward in the radial direction of the bridge portion 29c. The thicknesses of the first circumferential direction portion 34, the second circumferential direction portion 35, and the inclined portion 36 are substantially the same. As a result, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion 29c with reference to the reference line D1 is the innermost portion in the radial direction of the rotor in the magnet side portion of the bridge portion 29c. It is located inward in the radial direction from the part located at the end. Further, at least a part of the bridge portion 29c on the magnet side with respect to the reference line D1 is located at the outermost end position in the radial direction of the rotor. Further, the minimum thickness of the outer magnetic material portion 28a in the radial direction is larger than the minimum thickness which is the minimum value in the direction orthogonal to the direction from the magnet side end to the salient pole side end of the bridge portion 29c.

Further, in the configuration of this example, the rotor 12d includes a beam portion 41 formed so as to connect the magnet side end portion 33 of the bridge portion 29c and the salient pole portion 16. The beam portion 41 is inclined inward in the radial direction with respect to the circumferential direction toward the salient pole portion side. The beam portion 41 is divided into two spaces 40a and 40b by partitioning an intermediate portion of a space surrounded by a bridge portion 29c, a salient pole portion 16 and a magnet 26n and penetrating in the axial direction. Further, the magnet-side joint point of the beam portion 41 is located radially outside the salient pole-side joint point.

In the case of the above configuration as well, as in the configuration of FIG. 11, at least a part of the magnet side portion of the bridge portion 29c is located at the outermost end position in the radial direction of the rotor. As a result, the torque increasing effect can be enhanced. Further, the rotor includes the beam portion 41, and the magnet-side joint point of the beam portion 41 is located radially outside the salient pole-side joint point. As a result, the beam portion 41 is provided in the space surrounded by the bridge portion 29c, the salient pole portion 16 and the magnet 26n, and the coupling strength between the outer magnetic material portion 28a and the salient pole portion 16 can be increased. The target strength can be increased. Other configurations and operations are the same as those of FIGS. 1 to 6 or 11.

Further, in the configuration of FIG. 13, the beam portion 41 is formed so as to connect the magnet side end portion of the bridge portion 29c and the outer peripheral surface or the salient pole portion 16 at a position different from the salient pole portion 16 of the rotor core 14. Any configuration may be used. For example, in the configuration of FIG. 11, the beam portion connects the magnet side end portion of the bridge portion 29b and the outer peripheral surface at a position different from the salient pole portion 16 of the rotor core 14 (for example, the position indicated by the point Q in FIG. 11). May be formed. Even in this case, the mechanical strength of the rotor can be increased.

FIG. 14 is a diagram showing three examples of the rotary electric machine of another example of the embodiment and the maximum torque in the three examples. The basic configurations of the configurations of the three examples shown in FIGS. 14 (a), (b), and (c) are the same as those of FIG. 13. In the order of FIGS. 14 (a), 14 (b), and 14 (c), the position of the outermost end of the inclined portion in the radial direction of the bridge portion 29c changes from the magnet side to the salient pole side. .. In FIG. 14, the radial lines passing through the outermost radial ends E1, E2, and E3 of the inclined portion are indicated by broken lines C3, C4, and C5. The broken line C4 in FIG. 14B and the reference line D1 coincide with each other.

As shown in FIG. 14, as the radial outermost ends E1, E2, and E3 of the inclined portion of the bridge portion 29 change to the salient pole side, the circumferential length of the radial outermost end of the bridge portion 29c becomes larger. Become. The larger the circumferential length of the outermost radial end of the bridge portion 29c, the higher the maximum torque of the rotary electric machine. On the other hand, the configuration in which the outermost radial end E2 of the inclined portion shown in FIG. 14 (b) is located on the reference line D1 and the outermost radial end E2 of the inclined portion shown in FIG. 14 (c) are located. The maximum torque was substantially the same as that of the configuration located on the salient pole side as shown in FIG. 14 (b). As a result, in the configuration of FIG. 14B, it is easy to achieve both high maximum torque and high mechanical strength at the same time.

FIG. 15 is a portion of FIG. 3 for explaining the possibility that the armature current magnetic flux, which is the magnetic flux generated by the energization of the armature winding 61 (FIG. 3) of the stator 50, is short-circuited in the rotary electric machine shown in FIG. It is an enlarged equivalent figure. When the bridge portion 29 is formed so as to connect the outer magnetic material portion 28 and the salient pole portion 16 along the circumferential direction as in the configuration of FIG. 1, the outer magnetic material portion 28 and the outer magnetic material portion 28 of the rotor 12 and the rotor portion 12 are formed. The teeth 53 at a position away from the salient pole portion 16 may approach the bridge portion 29. Therefore, the armature current magnetic flux generated from the teeth 53 shown by T1 in FIG. 15 may be short-circuited toward the adjacent teeth 53 shown by T2 via the bridge portion 29. In this case, it causes an increase in iron loss between the bridge portion 29 and the teeth 53. The configuration shown in FIG. 16 described below is designed to suppress such an increase in iron loss.

FIG. 16 is a partially enlarged equivalent view of FIG. 3 showing a rotor 12e constituting another rotary electric machine of the embodiment. In the configuration of FIG. 16, the bridge portion 29c has a depressed portion 37 that is depressed inward in the radial direction of the rotor 12e. Then, the relationship between the first angle α1 for the depressed portion 37 and the second angle β for the width of the slot 54 of the stator 50 is defined. Specifically, the first angle α1 is the rotation center O of the rotor having a circumferential length between the bridge portion 29 side end F1 and the magnet side end F2 of the dip portion 37 in the circumferential direction of the tip of the salient pole portion 16. Is the central angle of. The second angle β is the central angle of the width of the slot 54 in the circumferential direction of the stator 50 with respect to the center O of the stator 50. Then, the first angle α1 is regulated to be equal to or larger than the second angle β.

According to the above configuration, a part of the bridge portion 29c is separated from the tip of the teeth 53 of the stator 50, and the electric current via the bridge portion 29c between the adjacent teeth 53 in relation to the width of the adjacent teeth 53. Short circuit of child current magnetic flux is less likely to occur. Therefore, the iron loss in the bridge portion 29c and the teeth 53 can be reduced. Other configurations and operations are the same as those of FIG.

FIG. 17 is a partially enlarged equivalent view of FIG. 3 showing a rotor 12f constituting another rotary electric machine of the embodiment. In the configuration of FIG. 17, unlike the configuration of FIG. 16, the end of the bridge portion 29d on the salient pole portion side is located near the tip end of the salient pole portion 16 in the radial direction. Also in this example, similarly to the configuration of FIG. 16, the first angle α2 for the dip portion 37 is regulated to be equal to or greater than the second angle β with respect to the width of the slot 54 of the stator 50. Other configurations and operations are the same as those of FIG.

In each example of the above-described embodiment, the case of forming the bridge portion connecting the portion covering the outer diameter side of the N pole magnet and the salient pole portion has been described, but the portion covering the outer diameter side of the S pole magnet is described. It is also possible to form a bridge portion connecting the salient pole portion. Further, the configuration of each example of the above embodiment is not limited to the case of combining with the hybrid field type rotary electric machine shown in FIGS. 1 and 2, and is combined with the hybrid field type rotary electric machine having another structure. You may. For example, in each of the above embodiments, as in the configuration described in Patent Document 4, the stator includes an annular core portion, two field windings, and a three-phase armature winding. It may be combined with a hybrid field type rotary armature in which field windings are fixed at both ends in the axial direction of the core portion. Further, the hybrid field type rotary electric machine is not limited to a configuration in which the rotor includes a plurality of N-pole magnets and S-pole magnets. For example, even if the configuration of each example of the above embodiment is applied to a configuration in which the rotor has only a plurality of N-pole magnets as magnets and the N-pole magnets and salient poles are alternately arranged on the outer peripheral portion of the rotor. Good.

10 rotary armature, 12, 12a to 12f rotor, 13 rotor yoke, 13a groove, 14 rotor core, 15 annular part, 16 first salient pole, 18 second salient pole, 19 protrusion, 25n N pole magnet part, 25s S Polar magnet part, 26n N pole magnet, 26s S pole magnet, 27n N side bridge member, 27s S side bridge member, 28, 28a outer magnetic material part, 29, 29a to 29d bridge part, 30 circumferential part, 31 inclined part , 32 Depressed part, 33 Magnet side end part, 34 1st peripheral direction part, 35 2nd peripheral direction part, 36 inclined part, 37 depressed part, 40, 40a, 40b space, 41 beam part, 50 stator, 51 1st Stator core, 52 2nd stator core, 53 teeth, 54 slots, 60 stator yoke, 61 armature winding, 62 field winding, 100 shaft, 110 rotary electric machine control system, 112 DC power supply, 113 1st drive circuit, 114th 2 drive circuit, 115 control device, 116 magnet holding part, 117 magnet hole, 118 side wall part, 119 outer peripheral connecting part.

Claims (5)

A rotor and a stator arranged so as to face each other in the radial direction of the rotor are provided.
The rotor includes a rotor core made of a magnetic material in which salient poles protruding in the radial direction are formed at a plurality of positions in the circumferential direction of the annular portion, and magnet portions having the same poles arranged at a plurality of positions in the circumferential direction. It is a concave pole type in which the portions and the salient pole portions are arranged so as to be arranged alternately in the circumferential direction on the outer circumference.
The stator is a hybrid field type including a field winding for passing a direct current that creates a field in the rotor and an armature winding for passing an alternating current for generating torque by interacting with the field. It is a rotating electric machine of
The magnet portion includes a magnet, an outer magnetic material portion that covers the radial outer side of the magnet, and a magnetic material bridge portion that connects the circumferential end of the outer magnetic material portion and the salient pole portion .
A reference that divides the angle formed by the first straight line in the radial direction passing through the circumferential center of the magnet and the second straight line in the radial direction passing through the circumferential center of the salient pole into two equal parts and extends in the radial direction. With reference to the line, the portion located at the innermost end in the radial direction of the rotor in the salient pole side portion of the bridge portion is located at the innermost end in the radial direction of the rotor portion in the magnet side portion of the bridge portion. Located inward in the radial direction from the part,
The salient pole side portion of the bridge portion has a circumferential portion extending in the circumferential direction of the rotor, and at the salient pole side end of the circumferential direction portion with respect to the circumferential direction toward the salient pole portion side. A rotary electric machine to which an inclined part inclined inward in the radial direction is connected. A rotor and a stator arranged so as to face each other in the radial direction of the rotor are provided.
The rotor includes a rotor core made of a magnetic material in which salient poles protruding in the radial direction are formed at a plurality of positions in the circumferential direction of the annular portion, and magnet portions having the same poles arranged at a plurality of positions in the circumferential direction. It is a concave pole type in which the portions and the salient pole portions are arranged so as to be arranged alternately in the circumferential direction on the outer circumference.
The stator is a hybrid field type including a field winding for passing a direct current that creates a field in the rotor and an armature winding for passing an alternating current for generating torque by interacting with the field. It is a rotating electric machine of
The magnet portion includes a magnet, an outer magnetic material portion that covers the radial outer side of the magnet, and a magnetic material bridge portion that connects the circumferential end of the outer magnetic material portion and the salient pole portion.
The rotor is formed so as to connect the magnet-side end portion of the bridge portion with the outer peripheral surface or the salient pole portion at a position different from the salient pole portion of the rotor core, and the bridge portion, the salient pole portion, and the like. And a beam portion that is surrounded by the magnet and partitions a space penetrating in the axial direction.
A rotary electric machine in which the magnet-side joint point of the beam portion is located radially outside the salient pole-side joint point. A rotor and a stator arranged so as to face each other in the radial direction of the rotor are provided.
The rotor includes a rotor core made of a magnetic material in which salient poles protruding in the radial direction are formed at a plurality of positions in the circumferential direction of the annular portion, and magnet portions having the same poles arranged at a plurality of positions in the circumferential direction. It is a concave pole type in which the portions and the salient pole portions are arranged so as to be arranged alternately in the circumferential direction on the outer circumference.
The stator is a hybrid field type including a field winding for passing a direct current that creates a field in the rotor and an armature winding for passing an alternating current for generating torque by interacting with the field. It is a rotating electric machine of
The magnet portion includes a magnet, an outer magnetic material portion that covers the radial outer side of the magnet, and a magnetic material bridge portion that connects the circumferential end of the outer magnetic material portion and the salient pole portion.
The stator includes an annular stator core, teeth formed at a plurality of positions in the circumferential direction of the stator core and projecting inward in the radial direction, and slots formed between adjacent teeth.
The bridge portion has a depressed portion that is depressed inward in the radial direction of the rotor.
Of the tips of the salient poles, the first angle, which is the central angle of the circumferential length of the bridge portion side end in the circumferential direction and the magnet side end of the depression portion with respect to the rotation center of the rotor, is the stator of the stator. A rotary electric machine having a second angle or more, which is a central angle of the width of the slot in the circumferential direction with respect to the center of the stator. In the rotary electric machine according to any one of claims 1 to 3.
A rotary electric machine in which at least a part of the magnet side portion of the bridge portion is located at the outermost position in the radial direction of the rotor. In the rotary electric machine according to any one of claims 1 to 4.
A rotary electric machine in which the minimum thickness of the outer magnetic material portion in the radial direction is larger than the minimum thickness in the direction orthogonal to the direction from the magnet side end of the bridge portion to the salient pole side end.

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