Winding field magnet rotor and rotary electric machine

Abstract

To provide a technique capable of preventing loosening of a twisted wire during rotation of a rotor when the twisted wire is provided as a rotor field magnet winding.SOLUTION: A rotary electric machine of a winding field magnet type comprises: a stator that includes a stator winding; and a rotor 60 that includes a field magnet winding 80. The rotor includes a rotor core 70 having a main pole 72 provided for each of magnetic poles arrayed in a circumferential direction and protruding in a radial direction, and the field magnet winding is formed by winding a conductor 90 on each main pole with the radial direction set as a winding axial direction. The conductor includes a twisted wire which is a twisted aggregate of a plurality of strands as a conductor. The conductor is wound on each main pole so that the rotating direction of the conductor by a centrifugal force applied to the conductor when the rotor rotates can match the twisting fastening direction of the twisted wire.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a wound field rotor and a rotating electric machine including a wound field rotor. [Background technology]

[0002] Patent Document 1 describes the use of a wire strand made of multiple copper or copper alloy wires bound together as the rotor coil of a variable speed generator-motor. A reinforcing member is joined to the end of the wire strand to prevent deformation of the coil end portion due to centrifugal force acting when the rotor rotates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-180175 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the reinforcing member prevents deformation (e.g., unraveling) caused by centrifugal force acting on the end of a twisted wire such as a wire strand. However, the reinforcing member cannot sufficiently prevent deformation caused by centrifugal force acting on a portion of the twisted wire far from the end.

[0005] In view of the above, an object of the present disclosure is to provide a technique for preventing a twisted wire from coming undone when a rotor rotates, when a twisted wire is provided as a field winding. [Means for solving the problem]

[0006] The first disclosure relates to a wound field rotor applied to a wound field type rotating electric machine, a rotor core having main poles provided for the magnetic poles arranged in the circumferential direction and projecting in the radial direction; A field winding; Equipped with The field winding is configured by winding a conductor around each of the main pole portions with the radial direction as a winding axis direction, The conductive wire includes a stranded wire as a conductor, the stranded wire being an assembly of a plurality of strands, The conductor is wound around each of the main pole portions so that the direction in which the conductor tends to rotate due to the centrifugal force acting on the conductor when the wound field rotor rotates coincides with the direction in which the twist of the twisted wire is tightened.

[0007] In the first disclosure, the conductor of the field winding is a twisted wire, which is an assembly of multiple strands twisted together. The conductor is wound around each main pole so that the direction in which the conductor rotates due to centrifugal force acting on the conductor when the rotor rotates coincides with the direction in which the twist of the twisted wire is tightened. Therefore, the twist of the twisted wire is tightened when the rotor rotates. This makes it possible to prevent the twisted wire from coming undone when the rotor rotates.

[0008] The second disclosure relates to a wound field rotor applied to a wound field type rotating electric machine, a rotor core having main poles provided for the magnetic poles arranged in the circumferential direction and projecting in the radial direction; A field winding; Equipped with The field winding is configured by winding a conductor around each of the main pole portions with the radial direction as a winding axis direction, The conductive wire includes a stranded wire as a conductor, the stranded wire being an assembly of a plurality of strands, When the main pole portion is viewed in a direction from the rotation center axis side of the wound field rotor toward the main pole portion along the radial direction, a portion of the field winding located to the right of the main pole portion is defined as a right portion, and a portion of the field winding located to the left of the main pole portion is defined as a left portion, When the right portion is viewed from an axial direction in which the rotation central axis extends, the twisted wire constituting the right portion is twisted in a counterclockwise direction, When the left portion is viewed from the axial direction, the twisted wires constituting the left portion are twisted in a clockwise direction.

[0009] In the second disclosure, the conductor constituting the field winding has a twisted wire as a conductor, which is an assembly of a plurality of strands twisted together. The twisted wire constituting the right part of the field winding has a counterclockwise twist direction, for example, Z twist. In this case, the twist direction of the twisted wire constituting the right part coincides with the direction in which the conductor constituting the right part rotates due to the centrifugal force acting on the conductor in the right part when the rotor rotates. In addition, the twisted wire constituting the left part of the field winding has a clockwise twist direction, for example, S twist. In this case, the twist direction of the twisted wire constituting the left part coincides with the direction in which the conductor constituting the left part rotates due to the centrifugal force acting on the conductor in the left part when the rotor rotates. Therefore, according to the second disclosure, the twist of the twisted wires constituting the right and left parts is tightened when the rotor rotates. This makes it possible to prevent the twisted wire from coming undone when the rotor rotates. [Brief description of the drawings]

[0010] [Figure 1] 1 is an overall configuration diagram of a control system for a rotating electric machine according to a first embodiment; [Diagram 2] FIG. 2 is a diagram showing an inverter and its peripheral configuration. [Diagram 3] FIG. 2 is a cross-sectional view of a rotor included in the rotating electric machine. [Figure 4] FIG. 4 is a diagram showing a resonant circuit provided in the rotor. [Diagram 5] FIG. 4 is a cross-sectional view of a conductor that constitutes a field winding. [Figure 6] FIG. 2 is an external view of the stranded wires that make up the conductor. [Figure 7] 4A and 4B are diagrams for explaining centrifugal force acting on a conductor when a rotor rotates. [Figure 8] FIG. 11 is a cross-sectional view of a rotor included in a rotating electric machine according to a second embodiment. [Figure 9] FIG. 4 is a cross-sectional view of a conductor that constitutes a field winding. [Figure 10] FIG. 13 is a diagram showing a holding member attached to an end of a conductor according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (First embodiment) As shown in Fig. 1, the control system includes a DC power supply 10, an inverter 20, a control unit 30, and a rotating electric machine 40. The rotating electric machine 40 is a synchronous machine of a wound field type, and more specifically, a rotating electric machine of a synchronous induction excitation type. In this embodiment, the control unit 30 controls the rotating electric machine 40 so that the rotating electric machine 40 functions as an ISG (Integrated Starter Generator) or an MG (Motor Generator) which is a motor and generator. For example, a mechanically and electrically integrated drive device is configured by including the rotating electric machine 40, the inverter 20, and the control unit 30, or the rotating electric machine 40, the inverter 20, and the control unit 30 are each configured by each component.

[0012] An overview of a rotating electric machine 40 will be described with reference to Fig. 1. The rotating electric machine 40 includes a housing 41, and a stator 50 and a rotor 60 housed in the housing 41. The rotating electric machine 40 of this embodiment is an inner rotor type in which the rotor 60 is disposed radially inside the stator 50.

[0013] The stator 50 includes a stator core 51 and a stator winding 52 wound around the stator core 51. The stator core 51 is made of laminated steel plates made of soft magnetic material, and has an annular back yoke and a plurality of teeth protruding radially inward from the back yoke. The stator winding 52 is made of, for example, a copper wire, and includes U-, V-, and W-phase windings 52U, 52V, and 52W arranged with an electrical angle of 120° from each other.

[0014] The rotor 60 includes a rotor core 70 and a field winding 80. The rotor core 70 is made of a soft magnetic material, such as a laminated steel plate. The field winding 80 may be made of, for example, an aluminum wire or a copper wire.

[0015] A rotating shaft 32 is inserted through a central hole of rotor core 70. The rotating shaft 32 is rotatably supported by housing 41 via bearings 42. The stator 50 and rotor 60 are both arranged coaxially with the rotating shaft 32. In the following description, the direction in which the rotating shaft 32 extends is referred to as the axial direction, the direction extending radially from the center of the rotating shaft 32 is referred to as the radial direction, and the direction extending circumferentially around the rotating shaft 32 is referred to as the circumferential direction.

[0016] As shown in FIG. 2, the inverter 20 includes a series connection of U-, V-, and W-phase upper-arm switches SUp, SVp, and SWp and U-, V-, and W-phase lower-arm switches SUn, SVn, and SWn. First ends of the U-, V-, and W-phase windings 52U, 52V, and 52W are connected to the connection points of the U-, V-, and W-phase upper-arm switches SUp, SVp, and SWp and the U-, V-, and W-phase lower-arm switches SUn, SVn, and SWn. Second ends of the U-, V-, and W-phase windings 52U, 52V, and 52W are connected at the neutral point. That is, in this embodiment, the U-, V-, and W-phase windings 52U, 52V, and 52W are star-connected. In this embodiment, each of the switches SUp to SWn is an IGBT. A freewheel diode is connected in inverse parallel to each of the SUp, SVp, SWp, SUn, SVn, and SWn.

[0017] The collectors of the U-, V-, and W-phase upper-arm switches SUp, SVp, and SWp are connected to a positive terminal of a DC power supply 10. The emitters of the U-, V-, and W-phase lower-arm switches SUn, SVn, and SWn are connected to a negative terminal of the DC power supply 10. A smoothing capacitor 11 is connected in parallel to the DC power supply 10.

[0018] As shown in Fig. 3, in the rotor 60, the rotor core 70 has a cylindrical portion 71 as a cylindrical yoke portion, a plurality of main pole portions 72 provided for each of the magnetic poles arranged in the circumferential direction and protruding radially outward from the cylindrical portion 71, and flange portions 74 extending radially from the tip portions of the main pole portions 72 on both sides. In this embodiment, the main pole portions 72 are provided at equal intervals in the circumferential direction. The Z-axis direction shown in Fig. 3 etc. is a direction parallel to the rotation center axis O of the rotation shaft 32 of the rotor 60.

[0019] The field winding 80 includes a first winding portion 81 and a second winding portion 82. In each main pole portion 72, the first winding portion 81 is wound radially outward, and the second winding portion 82 is wound radially inward from the first winding portion 81. In each main pole portion 72, the winding directions of the first winding portion 81 and the second winding portion 82 are the same. In addition, among the main pole portions 72 adjacent to each other in the circumferential direction, the winding directions of the winding portions 81, 82 wound on one side are opposite to the winding directions of the winding portions 81, 82 wound on the other side. Therefore, the magnetization directions of the main pole portions 72 adjacent to each other in the circumferential direction are opposite to each other.

[0020] The field winding 80 is configured by winding a conductor 90 around each main pole portion 72 with the radial direction of the rotor 60 as the winding axis direction. The field winding 80 includes a straight portion extending along the Z-axis direction on the radial side surface of the main pole portion 72, and a transition portion connecting the ends of the straight portion and extending in the circumferential direction of the rotor 60. FIG. 3 shows a cross section of the straight portion of the field winding 80. The straight portion is longer than the transition portion, and most of the conductor 90 constitutes the straight portion. When viewed along the radial direction of the rotor 60 in a direction from the side of the rotation center axis O of the rotor 60 toward each main pole portion 72, the straight portion extends in the vertical direction on both radial sides of each main pole portion 72. The transition portions extend in the horizontal direction on the upper and lower sides of each main pole portion 72. Hereinafter, the positive direction of the Z-axis shown in FIG. 3 may be referred to as the upward direction, and the negative direction of the Z-axis may be referred to as the downward direction.

[0021] The central axis of the main pole portion 72, which passes through the central axis O of the rotating shaft 32 of the rotor 60 and extends in the radial direction, is defined as a first axis B1. In addition, an axis that passes through the central positions in the circumferential direction of the first axes B1 adjacent to each other in the circumferential direction and the central axis O of the rotation, and extends in the radial direction is defined as a second axis B2. The first axis B1 corresponds to the d-axis, and the second axis B2 corresponds to the q-axis.

[0022] FIG. 4 shows an electric circuit on the rotor 60 side, which includes the windings 81, 82 wound around a common main pole 72. The rotor 60 is provided with a diode 83 as a rectifying element and a capacitor 84. A first end of the first winding 81 is connected to the cathode of the diode 83, and a first end of the second winding 82 is connected to the second end of the first winding 81. An anode of the diode 83 is connected to the second end of the second winding 82. A capacitor 84 is connected in parallel to the second winding 82. Alternatively, a first end of the first winding 81 may be connected to the anode of the diode 83, and a second end of the second winding 82 may be connected to the cathode of the diode 83.

[0023] In this embodiment, a series resonant circuit is formed by the first winding portion 81, the capacitor 84, and the diode 83, and a parallel resonant circuit is formed by the second winding portion 82 and the capacitor 84.

[0024] Returning to the explanation of Fig. 2, the control unit 30 is an electronic control unit (ECU) and generates drive signals that turn on and off each of the switches SUp-SWn that constitute the inverter 20. In detail, the control unit 30 generates drive signals that turn on and off each of the arm switches SUp-SWn in order to convert the DC power output from the DC power source 10 into AC power and supply it to the U-, V-, and W-phase windings 52U, 52V, and 52W, and supplies the generated drive signals to the gates of each of the arm switches SUp-SWn.

[0025] The control unit 30 turns on and off each of the switches SUp to SWn so that a composite current of the fundamental current and the high-frequency excitation current flows through each of the phase windings 52U, 52V, 52W. The fundamental current is a current that mainly generates torque in the rotating electric machine 40. The high-frequency excitation current is a current with a higher frequency than the fundamental current, and is a current that mainly excites the field winding 80 to cause a field current to flow through the field winding 80. The phase currents flowing through the phase windings 52U, 52V, 52W are shifted by 120° in electrical angle.

[0026] Note that some or all of the functions of the control unit 30 may be configured in hardware, for example, using one or more integrated circuits, etc. Also, the functions of the control unit 30 may be configured, for example, using software recorded on a non-transient physical recording medium and a computer that executes the software.

[0027] 5 and 6, the conductor 90 constituting the field winding 80 includes a stranded wire 91, which is an assembly of a plurality of strands 91a twisted together, as a conductor. The strands 91a are conductors whose surfaces are covered with a polymer insulating layer such as enamel. The conductor 90 is a coated conductor in which the stranded wire 91, which is an assembly of strands 91a, is coated with an insulating coating 92. The field winding 80 is configured by winding the conductor 90 around the main pole portion 72, and insulation is ensured between the conductors 90 that overlap each other in the radial direction, and between the conductor 90 and the rotor core 70.

[0028] As shown in Fig. 5, the cross section perpendicular to the axial direction of the wire 91a is circular, and the cross section perpendicular to the axial direction of the conductor 90 is circular. Note that Fig. 5 illustrates, as an example, a case in which four wires 91a having substantially the same shape, size, and material are twisted together to form the stranded wire 91, but this is not limited thereto. The number of wires 91a is not limited to four. Also, the stranded wire may be formed by twisting together a plurality of wires having different shapes, sizes, and materials.

[0029] The wire 91a is preferably made of at least carbon fiber and is configured as a carbon fiber composite. This reduces the weight of the wire 91a, and the weight of the conductor 90 and the field winding 80. Furthermore, by reducing the weight of the field winding 80, the centrifugal force acting on the field winding 80 when the rotor 60 rotates can be reduced, so that the thickness of the flange 74 can be reduced, and the radial size of the rotor 60 can be reduced. As the carbon fiber, nanocarbon fibers such as carbon nanotubes and carbon nanofibers can be suitably used, and carbon may be partially replaced by boron or the like. The stranded wire 91 can be configured, for example, as follows. (A) All of the strands 91a constituting the stranded wire 91 are made of carbon fiber. (B) Of all the wires 91a constituting the stranded wire 91, some of the wires are made of carbon fiber, and the remaining wires are made of a material other than carbon fiber (for example, copper or aluminum). (C) All of the wires 91a constituting the stranded wire 91 are wires (composite wires) made of a mixture of carbon fiber and a metal material. (D) Of all the wires 91a constituting the twisted wire 91, some of the wires are wires (composite wires) made of a mixed material of carbon fiber and a metal material, and the remaining wires are wires made of a material other than the mixed material (for example, wires made of carbon fiber, wires made of copper, or wires made of aluminum).

[0030] The conductor wire 90 has a twisted wire 91, which is an assembly of a plurality of wires 91a, as a conductor, and therefore can reduce the electrical resistance in the path through which the eddy current flows, compared to a case where the conductor is made of a single wire. The greater the number of wires 91a, the smaller the cross-sectional area of ​​each wire 91a, and the greater the effect of attenuating the eddy current. In addition, in the field winding 80, the wires 91a are twisted, so that there are portions in each wire 91a where the magnetic field is applied in the opposite directions, and the back electromotive voltage is offset. Therefore, the eddy current can also be reduced. In the rotating electric machine 40 of the synchronous induction excitation type, the frequency of the high-frequency excitation current for exciting the rotor 60 is relatively high. The higher the frequency of the high-frequency excitation current, the larger the eddy current that can be generated in the field winding 80 of the rotor 60, and the greater the loss due to the eddy current tends to be. Therefore, in the rotating electric machine 40, by forming the field winding 80 using the conductor 90 having the twisted wire 91 as a conductor, the effect of reducing eddy currents can be more significantly obtained.

[0031] As the stranded wire 91, stranded wires 91Z and 91S having different twisting directions can be suitably used. When multiple strands 91a are twisted together counterclockwise (left-handed) from the negative side to the positive side of the Z axis, a Z-twisted stranded wire 91Z shown in Fig. 6(a) is formed. When multiple strands 91a are twisted together clockwise (right-handed) from the negative side to the positive side of the Z axis, an S-twisted stranded wire 91S shown in Fig. 6(b) is formed.

[0032] The conductor 90 is wound around the main pole portion 72 so that the direction in which the conductor 90 rotates due to the centrifugal force acting on the conductor 90 when the rotor 60 rotates coincides with the direction in which the twist of the twisted wire 91 that constitutes the conductor 90 is tightened.

[0033] As shown in FIG. 7, when the main pole portion 72 is viewed from the rotation center axis O side of the rotor 60 toward each main pole portion 72 along the radial direction, the portion of the field winding 80 located on the right side of the main pole portion 72 is referred to as the right portion 80R, and the portion located on the left side of the main pole portion 72 is referred to as the left portion 80L. When the right portion 80R is viewed from the axial direction, the twisted wire 91 constituting the right portion 80R is twisted counterclockwise, and in this embodiment, it is a Z-twisted twisted wire. When the left portion 80L is viewed from the axial direction, the twisted wire 91 constituting the left portion 80L is twisted clockwise, and in this embodiment, it is an S-twisted twisted wire. Such a field winding 80 may be formed, for example, from a conductor 90 twisted so that Z-twisted portions and S-twisted portions alternately and repeatedly appear.

[0034] Fig. 7 is a diagram for simply explaining the direction in which the conductor 90 rotates due to the centrifugal force acting on the conductor 90 when the rotor 60 rotates. As shown by the arrow ROT in Fig. 7, when the rotor 60 rotates around the rotation axis O, a centrifugal force CR acts on the right portion 80R of the conductor 90, and a centrifugal force CL acts on the left portion 80L. The directions of the centrifugal forces CR and CL are parallel to the radial direction of the rotor 60, and are directed from the rotation axis O side of the rotor 60 toward the periphery side.

[0035] The centrifugal force CR acts as a force that rotates each conductor 90 in the right portion 80R counterclockwise as viewed from the positive direction of the Z axis, as indicated by the rotation direction KR. The rotation direction KR can also be said to be a direction of rotation in a left-handed screw direction. In the right portion 80R, the twisted wire 91 is a Z-twisted twisted wire 91Z. The twisting direction of the twisted wire 91Z is the direction in which the twist is tightened when each conductor 90 in the right portion 80R is rotated counterclockwise as viewed from the positive direction of the Z axis. Therefore, the direction in which each conductor 90 rotates due to the centrifugal force CR (rotation direction KR) coincides with the direction in which the twist of the twisted wire 91Z is tightened.

[0036] The centrifugal force CL acts as a force that rotates each conductor 90 in the left portion 80L clockwise as viewed from the positive direction of the Z axis, as indicated by the rotation direction KL. The rotation direction KL can also be said to be a direction of rotation in a right-handed screw direction. In the left portion 80L, the twisted wire 91 is an S-twisted twisted wire 91S. The twisted direction of the twisted wire 91S is the direction in which the twist is tightened when each conductor 90 in the left portion 80L is rotated counterclockwise as viewed from the positive direction of the Z axis. Therefore, the direction in which the conductor 90 rotates due to the centrifugal force CL (rotation direction KL) coincides with the direction in which the twist of the twisted wire 91S is tightened.

[0037] As shown in the rotational directions KR and KL, when the rotor 60 rotates, the centrifugal forces CR and CL acting on each conductor 90 tend to rotate each conductor 90 in a direction such that the surface farther from the main pole portion 72 around which the conductor 90 is wound faces away from the rotational center axis O of the rotor 60 toward the peripheral edge.

[0038] As described above, when the rotor 60 rotates, the conductor 90 rotates in a direction such that the surface farthest from the main pole portion 72 rotates from the side of the rotational center axis O of the rotor 60 toward the peripheral edge, and therefore it is preferable that the conductor 90 is wound around the main pole portion 72 so that this rotation direction coincides with the direction in which the twist of the twisted wire 91 is tightened.

[0039] In this embodiment, the straight portion is longer than the crossover portion, and most of the conductor 90 constitutes the straight portion. Therefore, if the direction in which the conductor 90 rotates due to the centrifugal force acting on the conductor 90 when the rotor 60 rotates is configured to coincide with the direction in which the twist of the twisted wires 91 constituting the conductor 90 is tightened in the straight portion, the effect of suppressing the unraveling of the twisted wires 91 as a whole can be sufficiently obtained. Even if the direction in which the twist of the twisted wires 91 is tightened does not coincide with the direction in which the twist of the twisted wires 91 is tightened in the majority of the other conductors 90, it can be said that the field winding 80 is constituted by winding the conductor 90 around each main pole portion 72 so that the direction in which the conductor 90 rotates due to the centrifugal force acting on the conductor 90 when the rotor 60 rotates coincides with the direction in which the twist of the twisted wires 91 is tightened. In order to obtain the effect of suppressing unraveling of the twisted wires 91 in the field winding 80, the proportion of the portion of the conductors 90 constituting the field winding 80 that coincides with the direction in which the twist of the twisted wires 91 is tightened should be 60% or more, and preferably 70% or more.

[0040] It should be noted that the centrifugal forces CR and CL act in a direction from the rotational center axis O side of the rotor 60 toward the periphery side, regardless of the rotational direction of the rotor 60. For this reason, if the conductor 90 is wound around the main pole portion 72, like the field winding 80, such that in the cross section shown in FIG 3, the twist of the twisted wire 91 is Z-twisted in the right portion 80R and S-twisted in the left portion 80L, the centrifugal forces CR and CL will tighten the twist of the twisted wire 91, regardless of the rotational direction of the rotor 60.

[0041] As shown in Fig. 5, the cross section perpendicular to the axial direction of the wire 91a is circular, and the cross section perpendicular to the axial direction of the conductor 90 is circular. As shown in Fig. 3, the conductor 90 is wound around the main pole portion 72 in a state in which the axial positions of adjacent conductors 90 in the circumferential direction of the rotor 60 are shifted from each other in the radial direction of the rotor 60. More specifically, the conductor 90 is wound around the main pole portion 72 so that the circle showing the cross section of the conductor 90 is in a substantially close-packed state in the cross section of the rotor 60 shown in Fig. 3. By winding the conductor 90 around the main pole portion 72 in this manner, the space factor of the field winding 80 in the rotor 60 can be increased, and the output of the rotating electric machine 40 can be improved. In addition, since the gaps between adjacent conductors 90 are small and each conductor 90 is less likely to move, the positional relationship between each conductor 90 in the circumferential and radial directions of the rotor 60 is prevented from shifting, and the twisted wires 91 that make up each conductor 90 are prevented from becoming untwisted.

[0042] Second embodiment Instead of the field winding 80 according to the first embodiment, a rotating electric machine may be provided with a rotor 160 having a field winding 180 as shown in Figs. 8 and 9. In Figs. 8 and 9, the same reference numerals are used for configurations similar to those of the first embodiment, and descriptions thereof will be omitted. The field winding 180 includes a first winding portion 181 and a second winding portion 182. The field winding 180 differs from the field winding 80 only in the conductor 190 and the way in which it is wound, and the first winding portion 181 is similar to the first winding portion 81, and the second winding portion 182 is similar to the second winding portion 82, and descriptions thereof will be omitted.

[0043] 9, the conductor 190 constituting the field winding 180 includes a stranded wire 191, which is an assembly of a plurality of strands 191a twisted together, as a conductor. Like the strands 91a, the strands 191a are conductors whose surfaces are covered with a polymer insulating layer. The conductor 190 is a coated conductor in which the stranded wire 191, which is an assembly of strands 191a, is coated with an insulating coating 192. The material constituting the conductor 190 is the same as the material constituting the conductor 90.

[0044] 9, a cross section perpendicular to the axial direction of wire 191a has a rectangular shape, for example a rectangular shape. A cross section perpendicular to the axial direction of conductor 190 has a rectangular shape, for example a rectangular shape. Wires 191a having approximately the same shape, size, and material are twisted together to form stranded wire 91.

[0045] Conductor 190 constituting field winding 180 is wound around main pole portion 72 so that the twist direction of twisted wire 191 coincides with the direction in which conductor 190 tends to rotate due to centrifugal force acting on conductor 190 when rotor 160 rotates, and the direction in which the twist of twisted wire 191 is tightened. When rotor 160 tries to rotate, conductor 190 tends to rotate in a rotation direction such that the surface farther from main pole portion 72 faces the periphery from the rotation center axis O of rotor 160. For this reason, conductor 190 is preferably wound around main pole portion 72 so that the rotation direction coincides with the direction in which the twist of twisted wire 191 is tightened.

[0046] In the field winding 180, similarly to the field winding 80, in the right portion 180R, each of the twisted wires 191 of each conductor 190 is Z-twisted, and in the left portion 180L, each of the twisted wires 191 of each conductor 190 is S-twisted. In the field winding 180, the straight portion is also longer than the crossover portion, and most of the conductor 190 constitutes a straight portion. For this reason, if the straight portion is configured so that the direction in which the conductor 190 tends to rotate due to the centrifugal force acting on the conductor 190 when the rotor 160 rotates coincides with the direction in which the twist of the twisted wires 191 constituting the conductor 190 is tightened, it is possible to sufficiently obtain the effect of suppressing the unraveling of the twisted wires 91.

[0047] As shown in FIG. 8, the conductor 190 is wound around the main pole portion 72 in a state in which the axial positions of adjacent conductors 90 in a direction perpendicular to the radial direction of the rotor 160 are approximately the same in the radial direction of the rotor 160. More specifically, the conductor 190 is wound around the main pole portion 72 so that the rectangles showing the cross sections of the conductors 190 are approximately in a close-packed state in the cross section of the rotor 160 shown in FIG. 8. By winding the conductor 190 around the main pole portion 72 in this manner, the space factor of the field winding 180 in the rotor 160 can be increased, and the output of the rotating electric machine 40 can be improved. In addition, since the gap between adjacent conductors 190 is small and each conductor 190 is less likely to move, the positional relationship between the conductors 190 in the circumferential and radial directions of the rotor 60 is suppressed from being shifted, and the twisted wires 191 constituting each conductor 190 are suppressed from being untwisted.

[0048] Conductor 190 having a rectangular cross section as shown in Figures 8 and 9 can be manufactured, for example, by compression molding conductor 90 having a circular cross section as shown in Figure 5. With field winding 180 according to the second embodiment, compression molding reduces the gaps between adjacent conductors 190, and also reduces the gaps between adjacent wires 191a constituting conductor 190, so that the effect of increasing the space factor of field winding 180 in rotor 160 can be more significantly obtained.

[0049] <Other embodiments> The above embodiment may be modified as follows.

[0050] In the first and second embodiments, a holding member for holding the twisted state of the twisted wires 91, 191 may be attached to the end of the conductor 90, 190. Taking the conductor 90 as an example, for example, as shown in FIG. 10(a), the holding member 95 includes a holding portion 96 for holding the end of the conductor 90. As shown in FIG. 10(b), the end of the conductor 90 is held by the holding portion 96, so that the twisted wire at the end of the conductor 90 can be prevented from being unwound. The holding member 95 is made of a conductive material, and the opposite side of the holding member 95 from the holding portion 96 is made into a terminal. For example, the holding member 95 may be attached to the end of each conductor 90 wound around each main pole portion 72, and the conductor 90 wound around each main pole portion 72 may be electrically connected to the holding member 95 of the conductor 90 wound around each main pole portion 72 to form the field winding 80.

[0051] The capacitor 84 that constitutes the resonant circuit of the rotor 60 may be connected in parallel to the first winding portion 81, instead of the second winding portion 82. Also, the capacitor 84 does not have to be provided in the resonant circuit.

[0052] The rotating electric machine is not limited to an inner rotor type rotating electric machine, but may be an outer rotor type rotating electric machine. In this case, the main pole portion protrudes radially inward from the rotor core.

[0053] The rotating electric machine is not limited to a star-connected rotating electric machine, but may be a delta-connected rotating electric machine.

[0054] The stator core may not be provided with teeth.

[0055] The configuration for passing a field current through the field winding is not limited to the circuit shown in Fig. 4, and may be, for example, a configuration including a brush electrically connected to the field winding and a power source electrically connected to the brush. In this case, it is not necessary to apply a high-frequency excitation voltage for inducing a field current to the stator winding.

[0056] The rotating electric machine is not limited to a rotating electric machine used as an in-vehicle main engine, but may be, for example, a rotating electric machine used as an ISG (Integrated Starter Generator) that serves as both a motor and a generator.

[0057] The moving body on which the control system is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. Furthermore, the control system is not limited to a system mounted on a moving body, but may be a stationary system.

[0058] Characteristic configurations extracted from each of the above-described embodiments will be described below. [Configuration 1] A wound field rotor (60) for use in a wound field type rotating electric machine (40), a rotor core (70) having main pole portions (72) provided for the magnetic poles arranged in the circumferential direction and projecting in the radial direction; Field winding (80, 180), Equipped with The field winding is configured by winding a conductor (90, 190) around each of the main pole portions with the radial direction as a winding axis direction, The conductor of the conductor wire is a stranded wire (91, 191) which is an assembly of a plurality of strands (91a, 191a) stranded together, the conductor is wound around each of the main pole portions so that a direction in which the conductor tends to rotate due to centrifugal force acting on the conductor when the wound field rotor rotates coincides with a direction in which the twist of the twisted wire is tightened. [Configuration 2] A wound field rotor (60) for use in a wound field type rotating electric machine (40), a rotor core (70) having main pole portions (72) provided for the magnetic poles arranged in the circumferential direction and projecting in the radial direction; Field winding (80, 180), Equipped with The field winding is configured by winding a conductor (90, 190) around each of the main pole portions with the radial direction as a winding axis direction, The conductor of the conductor wire is a stranded wire (91, 191) which is an assembly of a plurality of strands (91a, 191a) stranded together, When the main pole portion is viewed in a direction from the rotation center axis side of the wound field rotor toward the main pole portion along the radial direction, a portion of the field winding located to the right of the main pole portion is defined as a right portion (80R, 180R) and a portion of the field winding located to the left of the main pole portion is defined as a left portion (80L, 180L), When the right portion is viewed from an axial direction in which the central axis of rotation extends, the twisted wire constituting the right portion is twisted counterclockwise (KR), A wound field rotor, wherein when the left portion is viewed from the axial direction, the twisted wire constituting the left portion is twisted in a clockwise direction (KL). [Configuration 3] 3. The wound field rotor according to claim 1, wherein the wire is made of at least carbon fiber. [Configuration 4] The stranded wire is a stranded wire in which all of the wires constituting the stranded wire are made of carbon fiber; A stranded wire, in which among all the strands constituting the stranded wire, some strands are made of carbon fiber and the remaining strands are made of a material other than carbon fiber; A stranded wire in which all of the strands are made of a mixed material of carbon fiber and a metal material; or A stranded wire in which some of the strands are made of a mixture of carbon fiber and a metal material, and the remaining strands are made of a material other than the mixture. 4. The wound field rotor of claim 3, comprising: [Configuration 5] 5. The wound field rotor according to any one of configurations 1 to 4, wherein a holding member (95) for holding the twisted state of the twisted wires is attached to an end of the conductor. [Configuration 6] A cross section perpendicular to the axial direction of the wire and the conductor is circular, 6. The wound field rotor according to any one of configurations 1 to 5, wherein the conductors are wound around the main pole portion in a state in which axial positions of the conductors adjacent in the circumferential direction are shifted from each other in the radial direction. [Configuration 7] 6. The wound field rotor according to any one of configurations 1 to 5, wherein the conductor wire is formed by compression molding. [Configuration 8] A wound field rotor according to any one of configurations 1 to 7, a stator (50) including a stator winding (52); Equipped with The rotating electric machine (40) is configured such that a high-frequency current flows through the stator winding, thereby inducing a voltage in the field winding and causing a field current to flow. [Explanation of symbols]

[0059] Reference Signs List 40: rotating electric machine, 50: stator, 52: stator winding, 60: rotor, 70: rotor core, 72: main pole portion, 80, 180: field winding, 90, 190: conductor, 91a, 191a: wire, 91, 191: stranded wire

Claims

1. A wound field rotor (60) applied to a wound field type rotating electric machine (40), A rotor core (70) having main pole portions (72) provided for each of the magnetic poles arranged in the circumferential direction and projecting in the radial direction; A field winding (80, 180); Equipped with The field winding is configured by winding a conductor (90, 190) around each of the main pole portions with the radial direction as a winding axis direction, The conductor includes a stranded wire (91, 191) which is an assembly of a plurality of strands (91a, 191a) twisted together, the conductor is wound around each of the main pole portions so that a direction in which the conductor tends to rotate due to centrifugal force acting on the conductor when the wound field rotor rotates coincides with a direction in which the twist of the twisted wire is tightened.

2. A wound field rotor (60) applied to a wound field type rotating electric machine (40), A rotor core (70) having main pole portions (72) provided for each of the magnetic poles arranged in the circumferential direction and projecting in the radial direction; A field winding (80, 180); Equipped with The field winding is configured by winding a conductor (90, 190) around each of the main pole portions with the radial direction as a winding axis direction, The conductor includes a stranded wire (91, 191) which is an assembly of a plurality of strands (91a, 191a) twisted together, When the main pole portion is viewed in a direction from the rotation center axis side of the wound field rotor toward the main pole portion along the radial direction, a portion of the field winding located to the right of the main pole portion is defined as a right portion (80R, 180R) and a portion of the field winding located to the left of the main pole portion is defined as a left portion (80L, 180L), When the right portion is viewed from an axial direction in which the central axis of rotation extends, the twisted wire constituting the right portion is twisted in a counterclockwise direction (KR), A wound field rotor, wherein when the left portion is viewed from the axial direction, the twisted wire constituting the left portion is twisted in a clockwise direction (KL).

3. 3. The wound field rotor according to claim 1, wherein the wire is made of at least carbon fiber.

4. As the stranded wire, a stranded wire in which all of the wires constituting the stranded wire are made of carbon fiber; A stranded wire, in which among all the strands constituting the stranded wire, some strands are made of carbon fiber and the remaining strands are made of a material other than carbon fiber; A stranded wire in which all of the strands are made of a mixed material of carbon fiber and a metal material; or A stranded wire in which some of the strands are made of a mixture of carbon fiber and a metal material, and the remaining strands are made of a material other than the mixture. The wound field rotor of claim 3 .

5. 3. The wound field rotor according to claim 1, wherein a holding member (95) for holding the twisted state of the twisted wires is attached to an end of the conductor.

6. A cross section perpendicular to the axial direction of the wire and the conductor is circular, 3. The wound field rotor according to claim 1, wherein the conductors are wound around the main pole portion in a state in which axial positions of adjacent conductors in the circumferential direction are shifted from each other in the radial direction.

7. 3. The wound field rotor according to claim 1, wherein the conductor wire is formed by compression molding.

8. A wound field rotor according to claim 1 or 2, a stator (50) including a stator winding (52); Equipped with The rotating electric machine (40) is configured such that a high-frequency current flows through the stator winding, thereby inducing a voltage in the field winding and causing a field current to flow.

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