Wound-field type rotary electric machine

Abstract

To provide a wound-field type rotary electric machine capable of properly detecting a magnetic flux, which is generated in response to a field current, and estimating the field current as a result.SOLUTION: In a wound-field type rotary electric machine 40, a rotor 60 comprises: a rotor core 61 including a main pole part 62 which is provided for each of magnetic poles arranged side by side in a circumferential direction; and a field winding 70 which is wound around the main pole part 62. A rotary shaft 32 is integrated with the rotor core 61. The rotary shaft 32 is composed of a ferromagnetic material. An axis winding 151 is wound around the rotary shaft 32 and electrified by a field current which flows in the field winding 70. A magnetic sensor 152 is provided in an end of the rotary shaft 32 in an axial direction and detects a magnetic flux which is generated by electrifying the axis winding 151.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The disclosure in this specification relates to a wound-field type rotating electric machine. [Background technology]

[0002] In a wound-field type rotating electric machine, a field winding is wound around each main pole part (magnetic salient pole part) of a rotor core in a rotor, and a magnetic pole is formed for each main pole part when the field winding is energized. In addition, a technique for detecting a field current of a rotor is known in a brushless wound-field type rotating electric machine. For example, the technique described in Patent Document 1 includes a q-axis winding that detects the q-axis component of the air gap magnetic flux in an AC exciter and outputs a voltage waveform, and during a unit test of the AC exciter, a proportional coefficient between a DC output current flowing through the AC exciter and a voltage level of a voltage waveform output by the q-axis winding is calculated, and the proportional coefficient is held as a reference calibration value, and during operation of the brushless synchronous machine, the product of the voltage level of the voltage waveform output by the q-axis winding output voltage and the reference calibration value is calculated to calculate a field current. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-309100 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of the above-mentioned Patent Document 1 uses the linearity of the voltage waveform of the q-axis winding with respect to the field current, and estimates the field current by calculating the product of a reference calibration value extracted in advance and the voltage level of the voltage waveform output by the q-axis winding, and indirectly calculates the field current using the voltage waveform of the q-axis winding. In this case, there is a concern that the above-mentioned estimation algorithm will put a strain on the calculation load of the control device (microcomputer). It is also considered that the above-mentioned technology will require processing for surge voltages.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a wound-field type rotating electric machine that can properly detect magnetic flux generated in response to field current, and thus enable estimation of the field current. [Means for solving the problem]

[0006] The present disclosure relates to a stator having stator windings; a rotor having a rotor core having main pole portions provided for each of the magnetic poles arranged in the circumferential direction and protruding in the radial direction, and a field winding wound around the main pole portions; A rotating shaft integrated with the rotor core, A wound-field type rotating electric machine in which a high-frequency current for inducing a field current in the field winding flows in the stator winding, The rotating shaft is made of a ferromagnetic material, an axial winding wound around the rotating shaft and energized by a field current flowing through the field winding; a magnetic flux detector provided at an axial end of the rotating shaft and detecting a magnetic flux generated by energizing the shaft winding; Equipped with.

[0007] In a wound-field type rotating electric machine having the above configuration, a field current is induced in the field winding as a high-frequency current flows through the stator winding. In this case, an axial winding that is energized by the field current flowing through the field winding is wound around a rotating shaft made of a ferromagnetic material, generating magnetic flux in the axial direction of the rotating shaft. Then, a magnetic flux detector provided at the axial end of the rotating shaft detects the magnetic flux generated by the energization of the axial winding. In this configuration, the amount of magnetic flux generated by the field current can be directly detected. As a result, the magnetic flux generated in response to the field current can be properly detected, and thus the field current can be estimated. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an overall configuration diagram of a control system for a rotating electric machine. [Diagram 2] FIG. 2 is a diagram showing an inverter and its peripheral configuration. [Diagram 3] FIG. [Figure 4] FIG. 4 is a diagram showing an electric circuit provided in the rotor. [Diagram 5] FIG. 2 is a perspective view showing the overall configuration of a rotor. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 4 is an exploded perspective view of a winding unit in the rotor main portion. [Figure 9] FIG. [Figure 10] FIG. 2 is a vertical cross-sectional view showing a simplified configuration of a rotating electric machine. [Figure 11] FIG. 4 is an electrical circuit diagram showing the connection positions of the shaft windings in the rotor resonant circuit. [Figure 12] FIG. 4 is a perspective view showing a configuration regarding connections of coil bodies in each winding portion. [Figure 13] FIG. 4 is a diagram showing a configuration relating to connections between a first winding portion, a second winding portion, etc. and an axial winding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotating electric machine according to an embodiment of the present disclosure will now be described with reference to the drawings.

[0010] First, a control system including a rotating electric machine will be described with reference to Fig. 1. The control system includes a DC power supply 10, an inverter 20, a control device 30, and a rotating electric machine 40. The rotating electric machine 40 is a wound-field type synchronous machine. For example, the rotating electric machine 40, the inverter 20, and the control device 30 may be configured as an electromechanical integrated drive device, or the rotating electric machine 40, the inverter 20, and the control device 30 may each be configured with a respective component.

[0011] 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 rotating electric machine in which the rotor 60 is disposed radially inside the stator 50. The stator 50 includes a stator core 51 and a stator winding 52. The stator winding 52 is made of, for example, copper wire, and includes U-, V-, and W-phase windings 52U, 52V, and 52W disposed with an electrical angle of 120° from each other. The rotor 60 includes a rotor core 61 and a field winding 70. A rotating shaft 32 is assembled in a central hole of the rotor core 61. The rotating shaft 32 is rotatably supported by the housing 41 by bearings 42 and 43.

[0012] As shown in FIG. 2, the inverter 20 includes a series connection of upper arm switches SUp, SVp, SWp of U, V, and W phases and lower arm switches SUn, SVn, SWn of U, V, and W phases. First ends of U, V, and W phase windings 52U, 52V, and 52W are connected to the connection points of the upper arm switches SUp, SVp, and SWp and the lower arm switches SUn, SVn, and SWn in each phase. 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 stator winding 52 is star-connected. However, the stator winding 52 may be delta-connected. In this embodiment, each switch SUp to SWn is an IGBT. A freewheel diode is connected in inverse parallel to each switch SUp to SWn.

[0013] The collectors of the upper arm switches SUp, SVp, SWp of each phase are connected to the positive terminal of the DC power supply 10. The emitters of the lower arm switches SUn, SVn, SWn of each phase are connected to the negative terminal of the DC power supply 10. A smoothing capacitor 11 is connected in parallel to the DC power supply 10.

[0014] Next, the stator 50 and the rotor 60 will be described with reference to FIG.

[0015] The stator 50 and the 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] The stator core 51 is made of laminated steel plates made of soft magnetic material, and has an annular back yoke 51a and a plurality of teeth 51b protruding radially inward from the back yoke 51a. A plurality of slots 54 are formed between adjacent teeth 51b arranged in the circumferential direction. The stator winding 52 is formed by accommodating the phase windings of each phase in a predetermined order in each of these slots 54. For example, the stator 50 may have a segment coil structure using a plurality of conductor segments. However, the structure of the stator winding 52 is arbitrary.

[0017] The rotor core 61 is made of a soft magnetic material, for example, laminated steel plates. The rotor core 61 has a cylindrical portion 61a and a plurality of main pole portions 62 protruding radially outward from the cylindrical portion 61a. A field winding 70 is wound around the main pole portions 62 by concentrated winding. In this embodiment, eight main pole portions 62 are provided at equal intervals in the circumferential direction.

[0018] The field winding 70 includes a first winding portion 71a and a second winding portion 71b. The first winding portion 71a is wound on the radially outer side of each main pole portion 62, and the second winding portion 71b is wound on the radially inner side of the first winding portion 71a. In terms of the relationship with the stator 50, the first winding portion 71a is wound on the side closer to the stator 50 in the radial direction, and the second winding portion 71b is wound on the side farther from the stator 50. In each main pole portion 62, the winding directions of the first winding portion 71a and the second winding portion 71b are the same. In addition, among the main pole portions 62 adjacent in the circumferential direction, the winding directions of the winding portions 71a and 71b wound on one side are opposite to the winding directions of the winding portions 71a and 71b wound on the other side. Therefore, the magnetization directions of the main pole portions 62 adjacent in the circumferential direction are opposite to each other. In the rotor 60, the main pole portions 62 of the rotor core 61 and the field windings 70 wound around the main pole portions 62 form a plurality of magnetic poles (field poles) arranged in the circumferential direction.

[0019] 4 shows an electric circuit on the rotor 60 side including the winding parts 71a, 71b wound around the main pole part 62. The first winding part 71a and the second winding part 71b are connected in series, and a capacitor part CC consisting of a plurality of first capacitors 91 is connected in parallel to the second winding part 71b. The capacitor part CC is configured as a parallel connection of a plurality of first capacitors 91. A second capacitor 92 is connected in parallel to the series connection of the first winding part 71a and the second winding part 71b. The second capacitor 92 is provided for noise suppression. The first capacitor 91 and the second capacitor 92 are, for example, multilayer ceramic capacitors and have the same configuration.

[0020] A diode 93 is connected as a rectifying element between both ends of the series-connected body consisting of the windings 71a and 71b. That is, a first end of the first winding 71a is connected to the cathode of the diode 93, and a first end of the second winding 71b is connected to the second end of the first winding 71a. An anode of the diode 93 is connected to the second end of the second winding 71b.

[0021] In this embodiment, the first winding portion 71a, the first capacitor 91, and the diode 93 form a series resonant circuit, and the second winding portion 71b and the first capacitor 91 form a parallel resonant circuit. In this case, the first winding portion 71a is connected in series to the first capacitor 91, and the second winding portion 71b is connected in parallel to the first capacitor 91. If the first resonant frequency, which is the resonant frequency of the series resonant circuit, is f1 and the second resonant frequency, which is the resonant frequency of the parallel resonant circuit, is f2, these resonant frequencies f1 and f2 are expressed by the following formulas (1) and (2). L1 is the inductance of the first winding portion 71a, L2 is the inductance of the second winding portion 71b, and C is the capacitance of the first capacitor 91. f1=1 / (2π√(L1×C)) …(1) f2=1 / (2π√(L2×C)) …(2) When a high-frequency excitation current flows through the stator winding 52, a fluctuation occurs in the magnetic circuit including the stator core 51 and the rotor core 61 due to the high-frequency component of the main magnetic flux. The fluctuation in the main magnetic flux generates an induced voltage in each of the winding parts 71a, 71b, and a current is induced in each of the winding parts 71a, 71b. At this time, if an induced voltage of the same polarity occurs in each of the winding parts 71a, 71b, the induced currents in the winding parts 71a, 71b are not offset, and the induced current increases. The current flowing through each of the winding parts 71a, 71b is rectified in one direction by the diode 93. As a result, a field current flows through the field winding 70 in the direction rectified by the diode 93, and the field winding 70 is excited.

[0022] Returning to the explanation of Fig. 2, the control device 30 is mainly configured with a microcomputer (corresponding to a computer), and the microcomputer has a CPU. The control device 30 generates drive signals that turn on and off each of the switches SUp to SWn that configure the inverter 20. In detail, the control device 30 generates drive signals that turn on and off each of the switches SUp to 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 switches SUp to SWn.

[0023] The control device 30 turns on and off each of the switches SUp to SWn so that a composite current of a fundamental current and a 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 high-frequency current with a higher frequency than the fundamental current, and is a current that mainly excites the field winding 70. It is also possible to use a harmonic current as the high-frequency current. The phase currents flowing through the phase windings 52U, 52V, 52W are shifted by 120° in electrical angle.

[0024] Next, a more detailed description will be given of the configuration of the rotor 60. Fig. 5 is a perspective view showing the overall configuration of the rotor 60, Fig. 6 is an exploded perspective view of the rotor 60, and Fig. 7 is a vertical cross-sectional view of the rotor 60.

[0025] The rotor 60 is broadly divided into a rotor main part 101, a circuit module 102 provided at one of both axial ends of the rotor main part 101, and coil end covers 103, 104 as circular members attached to one and the other axial ends of the rotor main part 101. The rotor main part 101 includes the rotor core 61 and the field winding 70 as described in Fig. 3, and the rotating shaft 32 is attached to the central hole of the rotor core 61. The field winding 70 is made up of a plurality of winding units 110 arranged in a line in the circumferential direction.

[0026] The circuit module 102 is fixed to the rotating shaft 32 with the rotating shaft 32 inserted into the hollow portion. The circuit module 102 is provided at a position axially facing the coil end portion of the field winding 70. The circuit module 102 is an electric circuit section including the capacitors 91, 92 and diode 93 described in Fig. 4, as well as bus bars that electrically connect these elements.

[0027] Fig. 8 is an exploded perspective view of the winding unit 110 in the rotor main part 101, and Fig. 9 is a cross-sectional view showing the cross-sectional structure of a portion of the rotor main part 101. The rotor main part 101 has a plurality of winding units 110 provided for each magnetic pole of the rotor 60. Each winding unit 110 is formed in an annular shape with the axial direction as the longitudinal direction, and is assembled to the rotor core 61 with the main pole part 62 of the rotor core 61 inserted into the hollow part.

[0028] The winding unit 110 has a first coil module 111 that is radially outward and a second coil module 112 that is radially inward when attached to the main pole portion 62. The first coil module 111 is a coil module that corresponds to the first winding portion 71a, and the second coil module 112 is a coil module that corresponds to the second winding portion 71b.

[0029] The first coil module 111 has an annular coil body 121 formed by multiple windings of a conductive wire made of a rectangular wire in the circumferential and radial directions of the rotor 60, and a thin plate-like insulator 122 provided integrally with the coil body 121. The insulator 122 has a portion that extends in the circumferential direction and covers the radially outer and inner sides of the coil body 121, and a portion that extends in the radial direction and covers the hollow part of the coil body 121. In other words, the coil body 121 is insulated and coated with the insulator 122 at the radially inner and outer parts and at the inner peripheral part facing the main pole 62.

[0030] The second coil module 112 has an annular coil body 123 formed by multiple windings of a conductive wire made of a rectangular wire in the circumferential and radial directions of the rotor 60, and a thin plate-like insulator 124 provided integrally with the coil body 123. The insulator 124 has a portion that extends in the circumferential direction and covers the radially outer and inner sides of the coil body 123, and a portion that extends in the radial direction and covers the hollow part of the coil body 123. In other words, the coil body 123 is insulated and coated with the insulator 124 at the radially inner and outer parts and at the inner peripheral part facing the main pole 62.

[0031] The coil bodies 121, 123 are configured as, for example, α-wound coils, and are air-core coils in which the conductor material is wound in multiple layers in the overlapping direction (rotor circumferential direction) and in two layers in the extending direction of the hollow part (rotor radial direction). In this embodiment, a rectangular conductor wire with a conductor cross section having long and short sides is used as the conductor material of the coil bodies 121, 123. The coil bodies 121, 123 are wound in a direction in which the long side parts overlap in multiple layers due to the turns of the conductor material. The rectangular wire is composed of a conductor made of aluminum or the like and an insulating layer covering the conductor.

[0032] In the first coil module 111, two conductor ends 125 are drawn out in the axial direction from one coil body 121. In the second coil module 112, a total of six conductor ends 126 are drawn out in the axial direction from three coil bodies 123 arranged radially.

[0033] As shown in FIG. 9, in the first coil module 111, the conductor is wound in two layers in the radial direction, and in the second coil module 112, the conductor is wound in six layers in the radial direction. As for the coil bodies 121 and 123, in the first coil module 111, one coil body 121 is provided in the radial direction, and in the second coil module 112, three coil bodies 123 are provided side by side in the radial direction. In this case, the number of turns of the second winding portion 71b in each main pole portion 62 is greater than the number of turns of the first winding portion 71a. Note that in each coil module 111 and 112, the number of turns in the circumferential direction (in other words, the number of rows of the conductor in the circumferential direction) is different, and the number of turns is greater on the radially outer side than on the radially inner side. This improves the space factor of the field winding 70.

[0034] Furthermore, holding plates 127, 128 are provided between the main pole portions 62 of the rotor core 61 in the rotor main section 101 to hold the first coil module 111 and the second coil module 112 in an assembled state when the first coil module 111 and the second coil module 112 are assembled to the main pole portions 62. The holding plate 127 is attached to the radial outside of the first coil module 111, and the holding plate 128 is attached between the first coil module 111 and the second coil module 112.

[0035] As shown in Fig. 6, the rotor 60 has a coil end ring 81 that is attached to an axial end of the winding unit 110. As shown in Fig. 7, the coil end ring 81 is disposed between the coil end portion of the first coil module 111 and the coil end portion of the second coil module 112 in the radial direction, and is sandwiched between the retaining plate 128 and the coil end cover 103 in the axial direction.

[0036] In this embodiment, in the wound field type rotating electric machine 40, a configuration is provided in which a magnetic flux is generated in the rotating shaft 32 when a current is applied to the field winding 70, and the magnetic flux is detected. The configuration will be described below. Fig. 10 is a vertical cross-sectional view showing a simplified configuration of the rotating electric machine 40.

[0037] 10, the housing 41 has a cylindrical portion 45 and end plates 46, 47 provided on both axial sides of the cylindrical portion 45. A stator 50 is fixed to the inner periphery of the cylindrical portion 45. A cylindrical boss 48 is provided on the end plate portion 47 at one axial end. A bearing 42 is attached to the end plate portion 46, and a bearing 43 is attached to the boss portion 48 of the end plate portion 47. The bearings 42, 43 rotatably support the rotating shaft 32. The rotating shaft 32 is made of a ferromagnetic material such as iron, and is provided so as to be rotatable together with the rotor 60.

[0038] The bearings 42, 43 should preferably have a non-magnetic structure. For example, when the bearings 42, 43 are rolling bearings, the outer and inner races, which are the raceways, should be made of non-magnetic stainless steel, and the balls, which are the rolling elements, should be made of ceramics. Alternatively, the raceways and the rolling elements may be made of ceramics. Alternatively, a resin bearing may be used.

[0039] An axis winding 151 extending from the field winding 70 is wound around the rotating shaft 32. The axis winding 151 is connected in series to the field winding 70, and is energized by the field current flowing through the field winding 70. In this embodiment, the axis winding 151 includes a first axis winding 151A provided in a series resonant circuit including a first winding portion 71a, and a second axis winding 151B provided in a parallel resonant circuit including a second winding portion 71b. Details of this will be described later.

[0040] A magnetic sensor 152 as a magnetic flux detector and a magnetic flux collector 153 as a magnetic flux collector are provided on the boss 48 of the end plate 47, aligned in the direction in which the axis of the rotating shaft 32 extends linearly. The magnetic sensor 152 is provided at a position away from the rotating shaft 32 and facing the axial end face of the rotating shaft 32. The magnetic sensor 152 is, for example, a Hall sensor. The magnetic flux collector 153 is provided on the opposite side of the rotating shaft 32 with the magnetic sensor 152 in between. The rotating shaft 32, the magnetic sensor 152, and the magnetic flux collector 153 are provided at positions spaced from each other in the axial direction of the rotating shaft 32. The magnetic sensor 152 and the magnetic flux collector 153 are preferably fixed to the inner periphery of the boss 48.

[0041] In the rotating electric machine 40, when a field current (induced current) flows through the field winding 70 in response to energization of the stator winding 52, the field current also flows through the shaft winding 151, and magnetic flux is generated in the rotating shaft 32. The magnetic flux generated in the rotating shaft 32 is detected by the magnetic sensor 152. In this case, since a magnetic flux collector plate 153 is provided on the opposite side of the rotating shaft 32 across the magnetic sensor 152, the magnetic flux flowing out from the axial end face of the rotating shaft 32 is collected in the vicinity of the magnetic sensor 152, and the magnetic flux generated by the field current is properly detected.

[0042] The detection result of the magnetic sensor 152 is input to the control device 30. The control device 30 estimates the field current by multiplying the magnetic flux detection value of the magnetic sensor 152 by a predetermined proportionality coefficient. In this case, it is preferable to obtain in advance by calibration or the like the relationship between the field current and the amount of magnetic flux generated in the rotating shaft 32 in the rotating electric machine 40, and set the proportionality coefficient based on this relationship. It is also possible to define the relationship between the field current and the amount of magnetic flux in a map, and use the map to estimate the field current based on the amount of magnetic flux detected by the magnetic sensor 152.

[0043] The control device 30, for example, sets a target value of the field current and performs feedback control based on the target value and an estimated value of the field current (actual field current). The control device 30 can also perform an abnormality determination as to whether or not the field current is flowing properly through the field winding 70 based on the estimated value of the field current.

[0044] Fig. 11 is an electric circuit diagram showing the connection position of the shaft winding 151 in the resonant circuit provided in the rotor 60. In Fig. 11, one end of the first winding portion 71a is designated as a first end A1 and the other end as a second end A2, one end of the second winding portion 71b is designated as a first end B1 and the other end as a second end B2, and the second end A2 of the first winding portion 71a is electrically connected to the first end B1 of the second winding portion 71b, whereby the winding portions 71a and 71b are connected in series.

[0045] 11, in a series resonant circuit including the first winding portion 71a, the first capacitor 91, and the diode 93, a first axis winding 151A is connected in series to the first winding portion 71a at a position P1 on the first end A1 side or a position P2 on the second end A2 side of the first winding portion 71a. Also, in a parallel resonant circuit including the second winding portion 71b and the first capacitor 91, a second axis winding 151B is connected in series to the second winding portion 71b at a position P3 on the first end B1 side or a position P4 on the second end B2 side of the second winding portion 71b.

[0046] In a configuration in which the first axis winding 151A is connected in series to the first winding portion 71a and the second axis winding 151B is connected in series to the second winding portion 71b, the first axis winding 151A and the second axis winding 151B may be arranged side by side in the axial direction on the rotating shaft 32 as shown in Fig. 7. The turn ratio of the first axis winding 151A and the second axis winding 151B may be equal to the turn ratio of the first winding portion 71a and the second winding portion 71b. In this embodiment, the number of turns of the second axis winding 151B is greater than the number of turns of the first winding portion 71a, and therefore the number of turns of the second axis winding 151B is greater than the number of turns of the first axis winding 151A.

[0047] In this case, the total amount of magnetic flux generated in the first axis winding 151A and the second axis winding 151B is proportional to the amount of magnetic flux (amount of field magnetic flux of the rotor 60) that contributes to torque and is generated in the first winding portion 71a and the second winding portion 71b. Therefore, it is preferable to obtain a proportionality coefficient from the proportional relationship between the total amount of magnetic flux of each axis winding 151A, 151B and the amount of field magnetic flux of the rotor 60, and in the control device 30, multiply the magnetic flux detection value of the magnetic sensor 152 by the proportionality coefficient to calculate the amount of field magnetic flux, and further estimate the torque from the amount of field magnetic flux.

[0048] Here, a specific connection structure of the axial winding 151 in the rotor 60 will be described. Fig. 12 is a perspective view showing a configuration relating to the connection of the coil bodies 121, 123 in each winding portion 71a, 71b in the rotor 60. Fig. 12 shows a state in which the circuit module 102 is assembled to one axial side of the rotor main portion 101. Note that the configuration relating to the axial winding 151 is omitted in Fig. 12.

[0049] The circuit module 102 includes a component holder 130 that holds the above-mentioned capacitors 91, 92 and diode 93. The component holder 130 is made of an electrically insulating material such as synthetic resin. The component holder 130 includes a main body 131 that has an annular shape, and a plurality of conductor holders 132 that extend radially outward from the main body 131 in the radial direction. Although not shown in FIG. 12 because it is covered by the resin molded part 105, the main body 131 has the capacitors 91, 92 and diode 93 arranged in a line at positions that form an annular shape surrounding the rotating shaft 32.

[0050] The component holder 130 is provided with eight conductor wire holding portions 132, the same number as the main pole portions 62. Each conductor wire holding portion 132 is formed with a plurality of insertion holes 133 penetrating in the axial direction. Conductor ends 125, 126 and bus bars extending from the coil bodies 121, 123 of each winding portion 71a, 71b are inserted into each of these insertion holes 133 in a predetermined combination, and those inserted into the same insertion hole 133 are joined together by welding or the like. The conductor wire ends 125, 126 may be fixed to the conductor wire holding portion 132 while being inserted into the insertion holes 133.

[0051] Of the eight conductor wire holding portions 132, three conductor wire holding portions 132A, 132B, and 132C shown in FIG. 12 will be described in detail.

[0052] In the conductor holding portion 132A, the coil bodies 121, 123 arranged in four rows in the radial direction are connected to each other in the same row. Specifically, in the conductor holding portion 132A, in the connection portion X1, the conductor ends 125 of the coil bodies 121 adjacent in the circumferential direction are inserted one by one into the insertion hole 133, and the conductor ends 125 are connected to each other. In addition, in each of the connection portions X2 to X4, the conductor ends 126 of the coil bodies 123 adjacent in the circumferential direction are inserted one by one into the insertion hole 133, and the conductor ends 126 are connected to each other. In the connection portion X5, bus bars 141, 142 for connection to the first capacitor 91 are connected.

[0053] In addition, in the conductor holding section 132B, connections are made between the coil bodies 121, 123 in different rows (lane change connection) and to the capacitors 91, 92 and diodes 93 via bus bars. Specifically, in the conductor holding section 132B, at a connection point Y1, the conductor end 125 of the coil body 121 of the first winding section 71a is connected to one end of a bus bar 143 for the second capacitor 92 and to an end of a bus bar 144 for connecting the cathode of the diode 93. The connection at this connection point Y1 corresponds to the connection at the first end A1 of the first winding section 71a in the state in which the axis winding 151 is not connected in the circuit diagram of FIG.

[0054] At the connection Y2, the conductor end 125 of the coil body 121 of the first winding portion 71a, the conductor end 126 of the coil body 123 of the second winding portion 71b, and the end of the bus bar 142 for the first capacitor 91 are connected. The connection at the connection Y2 corresponds to the connection between the second end A2 of the first winding portion 71a and the first end B1 of the second winding portion 71b in the state in which the axis winding 151 is not connected in the circuit diagram of FIG. 11. At the connection portions Y3 and Y4, the conductor end 126 of each coil body 123 in different rows is connected to each other. At the connection portion Y5, the bus bars 143 and 145 for connection to the second capacitor 92 are connected.

[0055] In conductor holding portion 132C, connection portion Z1 connects conductor end portion 126 of coil body 123 of second winding portion 71b, an end of bus bar 146 common to capacitors 91, 92, and an end of bus bar 147 for connecting the anode of diode 93. The connection at connection portion Z1 corresponds to the connection on the second end B2 side of second winding portion 71b in the state in which axis winding 151 is disconnected in the circuit diagram of FIG.

[0056] Each winding section 71a, 71b is configured by connecting the coil bodies 121, 123 of each main pole section 62 in the circumferential direction. In the first winding section 71a, the conductor ends 125 at both ends of the series-connected body made up of the plurality of coil bodies 121 are the first end A1 and the second end A2. In the second winding section 71b, the conductor ends 126 at both ends of the series-connected body made up of the plurality of coil bodies 123 are the first end B1 and the second end B2. In this embodiment, the conductor ends 125, which are the first end A1 and the second end A2 of the first winding section 71a, and the conductor ends 126, which are the first end B1 and the second end B2 of the second winding section 71b, are inserted into the insertion hole 133 of the conductor holding section 132 and fixed, and the axial windings 151A, 151B are electrically connected to either of the conductor ends 125, 126.

[0057] FIG. 13 is a diagram for explaining the configuration regarding the connection between both ends A1, A2 of the first winding portion 71a and both ends B1, B2 of the second winding portion 71b and the axis windings 151A, 151B in the conductor holding portion 132 of the circuit module 102.

[0058] Fig. 13(a) is a diagram showing a configuration in which the first axis winding 151A is connected to the first end A1 (P1 in Fig. 11) of the first winding portion 71a. In this case, the first axis winding 151A is connected between the first end A1 of the first winding portion 71a and the bus bar 143 for the second capacitor 92 and the bus bar 144 for the diode 93. In terms of Fig. 12, at the connection portion Y1, the conductor end portion 125 of the first winding portion 71a and the bus bars 143, 144 may be held in separate insertion holes 133 of the conductor holding portion 132, and the first axis winding 151A may be connected between them.

[0059] Fig. 13(b) is a diagram showing a configuration in which the first axis winding 151A is connected to the second end A2 (P2 in Fig. 11) of the first winding portion 71a. In this case, the first axis winding 151A is connected between the second end A2 of the first winding portion 71a and the first end B1 of the second winding portion 71b and the bus bar 142 for the first capacitor 91. In terms of Fig. 12, at the connection portion Y2, the conductor end 125 of the first winding portion 71a and the conductor end 126 and the bus bar 142 of the second winding portion 71b are preferably held in separate insertion holes 133 of the conductor holding portion 132, and the first axis winding 151A is preferably connected between them.

[0060] Fig. 13(c) is a diagram showing a configuration in which the second axis winding 151B is connected to the first end B1 (P3 in Fig. 11) of the second winding portion 71b. In this case, the second axis winding 151B is connected between the first end B1 of the second winding portion 71b and the second end A2 of the first winding portion 71a and the bus bar 142 for the first capacitor 91. In terms of Fig. 12, at the connection portion Y2, the conductor end 126 of the second winding portion 71b and the conductor end 125 and bus bar 142 of the first winding portion 71a are preferably held in separate insertion holes 133 of the conductor holding portion 132, and the second axis winding 151B is preferably connected between them.

[0061] Fig. 13(d) is a diagram showing a configuration in which the second axis winding 151B is connected to the second end B2 (P4 in Fig. 11) of the second winding portion 71b. In this case, the second axis winding 151B is connected between the second end B2 of the second winding portion 71b and the bus bar 146 common to the capacitors 91, 92 and the bus bar 147 for the diode 93. In terms of Fig. 12, at the connection portion Z1, the conductor end portion 126 of the second winding portion 71b and the bus bars 146, 147 may be held in separate insertion holes 133 of the conductor holding portion 132, and the second axis winding 151B may be connected between them.

[0062] In the configuration of Figures 13(a) to (d), the axial windings 151A, 151B are formed from a conductor material separate from the respective winding portions 71a, 71b (coil bodies 121, 123), and are preferably connected to the conductor ends 125, 126 of the respective winding portions 71a, 71b by welding, crimping, or the like.

[0063] 13(a) to 13(d), the axial windings 151A, 151B are connected to the conductor ends 125, 126 held by the conductor holding portion 132 of the circuit module 102. In this case, the conductor ends 125, 126 are positioned in the conductor holding portion 132 of the circuit module 102, making it easy to attach the axial windings 151A, 151B.

[0064] In the rotor 60, the first axis winding 151A may be connected in series to the first winding portion 71a in the configuration shown in either of Figs. 13(a) and (b), and the second axis winding 151B may be connected in series to the second winding portion 71b in the configuration shown in either of Figs. 13(c) and (d). When using the combination of Figs. 13(b) and 13(c), the conductor end 125 (second end A2) of the first winding portion 71a, the conductor end 126 (first end B1) of the second winding portion 71b, and the bus bar 142 may each be individually held in the conductor holding portion 132.

[0065] The first axis winding 151A and the second axis winding 151B are connected to the ends of the winding portions 71a, 71b and the ends of the bus bars as described above, and are arranged side by side in the axial direction on the rotating shaft 32 (see FIG. 7).

[0066] 10, the rotating shaft 32 may be provided with a resin sealing portion 155 that seals the axial winding 151 with resin while the axial winding 151 is wound around it. In a configuration in which the axial winding 151 is wound around the rotating shaft 32, the axial winding 151 rotates as the rotating shaft 32 rotates. In this case, there is a concern that the axial winding 151 may be deflected or shifted in position due to acceleration or deceleration of the rotation of the rotating shaft 32. In this regard, since the axial winding 151 is sealed with the resin sealing portion 155, the deflection and shifting in position of the axial winding 151 are suppressed.

[0067] According to the present embodiment described above in detail, the following excellent effects can be obtained.

[0068] In the rotor 60, the shaft winding 151 connected in series to the field winding 70 is wound around the rotating shaft 32 made of a ferromagnetic material, and a magnetic sensor 152 provided at the axial end of the rotating shaft 32 detects the magnetic flux generated by energizing the shaft winding 151. In this case, the amount of magnetic flux generated by the field current can be directly detected. As a result, the amount of magnetic flux generated according to the field current can be properly detected, and the field current can be estimated.

[0069] In the direction in which the axis of the rotating shaft 32 extends linearly, a magnetic flux collecting plate 153 that collects magnetic flux flowing out from the axial end face of the rotating shaft 32 is provided on the opposite side of the rotating shaft 32 across the magnetic sensor 152. This makes it possible to properly detect the magnetic flux flowing out from the axial end face of the rotating shaft 32 by the magnetic sensor 152 even if a ferromagnetic body that causes magnetic flux bias is present near the axial end of the rotating shaft 32, thereby improving the estimation accuracy of the field current.

[0070] If there are any parts made of ferromagnetic material around the rotating electric machine 40, the magnetic flux flowing out from the rotating shaft 32 may be attracted to the ferromagnetic material, which may cause an unintended change in the amount of magnetic flux passing through the magnetic sensor 152. If the amount of magnetic flux changes, there is a concern that a current estimation error may occur. In this regard, the provision of the magnetic flux collector 153 reduces the influence of the surrounding environment, improving the accuracy of the current estimation.

[0071] In the rotating electric machine 40, the bearings 42, 43 that rotatably support the rotating shaft 32 are of a non-magnetic structure. This makes it possible to increase the amount of magnetic flux that flows out from the axial end face of the rotating shaft 32 and is detected by the magnetic sensor 152, compared to the case where a bearing of a magnetic structure is used, and thus makes it possible to improve the accuracy of magnetic flux detection.

[0072] In a series resonant circuit including the first winding portion 71a, the first capacitor 91, and the diode 93, the first axis winding 151A is connected in series to the first end or the second end of the first winding portion 71a, and in a parallel resonant circuit including the second winding portion 71b and the first capacitor 91, the second axis winding 151B is connected in series to the first end or the second end of the second winding portion 71b. This makes it possible to properly detect the magnetic flux generated according to the field current of each of the winding portions 71a and 71b when a field current flows through each of the winding portions 71a and 71b due to high-frequency energization of the stator winding 52. In this case, it becomes possible to grasp the magnitude of the field current that contributes to the torque generation of the rotating electric machine 40, and the torque feedback control of the rotating electric machine 40 can be properly performed.

[0073] The winding ratio of the first axis winding 151A and the second axis winding 151B is equal to the winding ratio of the first winding portion 71a and the second winding portion 71b. This makes the total amount of magnetic flux generated by the axis windings 151A and 151B proportional to the amount of field magnetic flux (amount of magnetic flux contributing to torque) of the rotor 60 generated by the winding portions 71a and 71b, allowing the amount of field magnetic flux and torque to be suitably estimated.

[0074] In the circuit module 102, the conductor ends 125, 126 of the winding portions 71a, 71b are held by the conductor holding portion 132 of the component holder 130, the first axis winding 151A is connected to the conductor end 125, and the second axis winding 151B is connected to the conductor end 126. In this case, the connection of the axis windings 151A, 151B only needs to be made to the conductor ends 125, 126 held by the conductor holding portion 132 of the circuit module 102, and the axis winding 151 can be fixed simply and suitably.

[0075] A resin sealing portion 155 is provided to seal with resin the shaft winding 151 (151A, 151B) wound around the rotating shaft 32. This makes it possible to prevent the shaft winding 151 from being bent or shifted in position even if the rotation of the rotating shaft 32 is accelerated or decelerated.

[0076] (Other embodiments) The above embodiment may be modified, for example, as follows.

[0077] In the above embodiment, the axis winding 151 is configured to include the first axis winding 151A connected in series to the first winding portion 71a and the second axis winding 151B connected in series to the second winding portion 71b, but this may be changed. For example, only one of the first axis winding 151A and the second axis winding 151B may be provided.

[0078] 11, in a series resonant circuit including the first winding portion 71a, an axis winding 151 is connected to either one of the ends A1 or A2 of the first winding portion 71a, and the axis winding 151 is not connected to a parallel resonant circuit including the second winding portion 71b. In this configuration, a magnetic flux corresponding to the current flowing through the first winding portion 71a is detected by a magnetic sensor 152. In this case, it is possible to detect an abnormality in, for example, a diode 93 based on a detection value of the magnetic sensor 152.

[0079] In addition, in the parallel resonant circuit including the second winding portion 71b, the axis winding 151 is connected to either one of the ends B1, B2 of the second winding portion 71b, and the axis winding 151 is not connected to the series resonant circuit including the first winding portion 71a. In this configuration, the magnetic sensor 152 detects the magnetic flux corresponding to the current flowing through the second winding portion 71b. In this case, it is possible to detect, for example, an abnormality in the first capacitor 91 based on the detection value of the magnetic sensor 152.

[0080] In the above embodiment, each of the winding portions 71a, 71b of the field winding 70 is configured as a series connection of a plurality of coil bodies 121, 123, but this may be modified. For example, each of the winding portions 71a, 71b may be configured by continuously winding one conductor wire around each of the main pole portions 62.

[0081] The shaft windings 151A, 151B may be formed of a part of the conductor material wound as each of the winding portions 71a, 71b. In a configuration in which the conductor material is continuously wound around each of the main pole portions 62 to form each of the winding portions 71a, 71b, the conductor holder 132 of the circuit module 102 is not necessary, and the shaft windings 151A, 151B may be continuously wound from each of the winding portions 71a, 71b. In this case, in a configuration in which the winding portions 71a, 71b and the shaft windings 151A, 151B are connected in series, the connection work such as welding or crimping between the conductor end portions 125, 126 of the winding portions 71a, 71b and the shaft windings 151A, 151B can be omitted.

[0082] In the rotor 60, the second winding portion 71b may be disposed radially outward (on the stator 50 side) than the first winding portion 71a.

[0083] The field winding 70 of the rotor 60 does not have to be divided into the first winding portion 71a and the second winding portion 71b. In addition, the resonant circuit does not have a parallel resonant circuit, and may be provided as a series resonant circuit consisting of the field winding 70, a capacitor, and a diode.

[0084] In the stator 50, the stator core may not be provided with teeth.

[0085] 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.

[0086] The moving object on which the rotating electric machine system is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. Furthermore, the rotating electric machine system is not limited to a system mounted on a moving object, but may be a stationary system.

[0087] The technical ideas extracted from the above-described embodiments will be described below. [Configuration 1] a stator (50) having a stator winding (52); a rotor (60) having a rotor core (61) having main pole portions (62) provided for each magnetic pole arranged in the circumferential direction and projecting in the radial direction, and a field winding (70) wound around the main pole portions; A rotating shaft (32) integrated with the rotor core, A wound-field type rotating electric machine (40) in which a high-frequency current for inducing a field current in the field winding flows in the stator winding, The rotating shaft is made of a ferromagnetic material, an axial winding (151) wound around the rotating shaft and energized by a field current flowing through the field winding; a magnetic flux detector (152) provided at an axial end of the rotating shaft and configured to detect a magnetic flux generated by energizing the shaft winding; A wound field type rotating electric machine comprising: [Configuration 2] 2. The wound-field type rotating electric machine according to claim 1, wherein a magnetic flux collecting member (153) that collects magnetic flux flowing out from an axial end face of the rotating shaft is provided on the opposite side of the rotating shaft across the magnetic flux detection unit in the direction in which the axis of the rotating shaft extends linearly. [Configuration 3] the field winding has a first winding portion (71a) and a second winding portion (71b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected across both ends of the series connection of the first winding portion and the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; a first axial winding (151A) is connected in series to a first end side or a second end side of the first winding portion in a series resonant circuit including the first winding portion, the capacitor, and the diode, as the axial winding; 3. The wound field type rotating electric machine according to configuration 1 or 2, wherein in a parallel resonant circuit including the second winding portion and the capacitor, a second axial winding (151B) is connected in series to the second winding portion as the axial winding on a first end side or a second end side of the second winding portion. [Configuration 4] 4. The wound-field type rotating electric machine according to configuration 3, wherein a turn ratio between the first axis winding and the second axis winding is equal to a turn ratio between the first winding portion and the second winding portion. [Configuration 5] the rotor has a circuit module (102) that electrically connects the first winding portion, the second winding portion, the diode, and the capacitor to configure the series resonant circuit and the parallel resonant circuit, the circuit module has a conductor holding portion (132) that holds conductor ends (125) on the first end side and the second end side of the first winding portion and conductor ends (126) on the first end side and the second end side of the second winding portion, the first axial winding is connected to a conductor end portion on a first end side or a second end side of the first winding portion held by the conductor holding portion, 5. The wound-field type rotating electric machine according to configuration 3 or 4, wherein the second axis winding is connected to a conductor end portion on a first end side or a second end side of the second winding portion held by the conductor holding portion. [Configuration 6] the field winding has a first winding portion (71a) and a second winding portion (71b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected between a first end of the first winding portion and a second end of the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; 3. The wound-field type rotating electric machine according to configuration 1 or 2, wherein in a series resonant circuit including the first winding portion, the capacitor, and the diode, the axial winding is connected in series to a first end side or a second end side of the first winding portion. [Configuration 7] the field winding has a first winding portion (71a) and a second winding portion (71b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected between a first end of the first winding portion and a second end of the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; 3. The wound-field type rotating electric machine according to configuration 1 or 2, wherein in a parallel resonant circuit including the second winding portion and the capacitor, the axial winding is connected in series to a first end side or a second end side of the second winding portion. [Configuration 8] 8. The wound-field type rotating electric machine according to any one of configurations 1 to 7, wherein the rotating shaft is provided with a resin sealing portion (155) that seals the axial winding with resin while the axial winding is wound thereon. [Explanation of symbols]

[0088] 32...rotating shaft, 40...rotating electric machine, 50...stator, 52...stator winding, 60...rotor, 61...rotor core, 62...main pole portion, 70...field winding, 151...axis winding, 152...magnetic sensor.

Claims

1. a stator (50) having stator windings (52); A rotor (60) having a rotor core (61) having main pole portions (62) provided for each magnetic pole arranged in the circumferential direction and projecting in the radial direction, and a field winding (70) wound around the main pole portions; A rotating shaft (32) integrated with the rotor core, A wound-field type rotating electric machine (40) in which a high-frequency current for inducing a field current in the field winding flows in the stator winding, The rotating shaft is made of a ferromagnetic material, An axial winding (151) wound around the rotating shaft and energized by a field current flowing through the field winding; a magnetic flux detection unit (152) provided at an axial end of the rotating shaft and configured to detect a magnetic flux generated by energization of the shaft winding; A wound field type rotating electric machine comprising:

2. 2. The wound-field type rotating electric machine according to claim 1, further comprising a magnetic flux collecting member (153) for collecting magnetic flux flowing out from an axial end face of the rotating shaft, the magnetic flux collecting member being provided on the opposite side of the rotating shaft across the magnetic flux detection unit in a direction in which the axis of the rotating shaft extends linearly.

3. the field winding has a first winding portion (71 a) and a second winding portion (71 b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected across both ends of the series connection of the first winding portion and the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; a first axial winding (151A) is connected in series to a first end side or a second end side of the first winding portion in a series resonant circuit including the first winding portion, the capacitor, and the diode, as the axial winding; 3. The wound field type rotating electric machine according to claim 1, wherein a second axial winding (151B) is connected in series with the second winding portion as the axial winding to a first end side or a second end side of the second winding portion in a parallel resonant circuit including the second winding portion and the capacitor.

4. 4. The wound-field type rotating electric machine according to claim 3, wherein a turn ratio between the first axis winding and the second axis winding is equal to a turn ratio between the first winding portion and the second winding portion.

5. the rotor has a circuit module (102) that electrically connects the first winding portion, the second winding portion, the diode, and the capacitor to configure the series resonant circuit and the parallel resonant circuit, the circuit module has a conductor holding portion (132) for holding conductor ends (125) on the first end side and the second end side of the first winding portion and conductor ends (126) on the first end side and the second end side of the second winding portion, the first axial winding is connected to a conductor end portion on a first end side or a second end side of the first winding portion held by the conductor holding portion, 4. The wound field type rotating electric machine according to claim 3, wherein the second axis winding is connected to a conductor end portion on a first end side or a second end side of the second winding portion held by the conductor holding portion.

6. the field winding has a first winding portion (71 a) and a second winding portion (71 b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected between a first end of the first winding portion and a second end of the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; 3. The wound-field type rotating electric machine according to claim 1, wherein in a series resonant circuit including the first winding portion, the capacitor, and the diode, the axial winding is connected in series to a first end side or a second end side of the first winding portion.

7. the field winding has a first winding portion (71 a) and a second winding portion (71 b), and the winding portions are connected in series by an electrical connection between a first end and a second end of the first winding portion and a first end and a second end of the second winding portion, and a diode (93) is connected between a first end of the first winding portion and a second end of the second winding portion, and a capacitor (91) is connected in parallel to the second winding portion; 3. The wound field type rotating electric machine according to claim 1, wherein in a parallel resonant circuit including the second winding portion and the capacitor, the axial winding is connected in series to a first end side or a second end side of the second winding portion.

8. 3. The wound-field type rotating electric machine according to claim 1, wherein the rotating shaft is provided with a resin sealing portion (155) that seals the axial winding with resin in a state where the axial winding is wound therearound.

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