JP2014064339A - Control device for excited rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an excited rotary electric machine that prevents an increase in voltage associated with fluctuations in interlinkage magnetic flux in excitation coils.SOLUTION: An excited rotary electric machine includes: a rotor having a pair of rotor cores that are arranged in an axial direction, with a gap therebetween, so as to face each other and that each have magnetic poles spaced circumferentially at predetermined intervals, with the respective magnetic poles of the rotor cores arranged diagonally in the axial direction with a gap therebetween; a stator that is arranged through an air gap on a radially outer side of the rotor so as to face the rotor and that generates a rotating magnetic field for rotating the rotor; and excitation coils that excite the magnetic poles. A control device for the excited rotary electric machine has: exciting voltage detection means that detects voltages generated in the excitation coils; and exciting current control means that, when voltage detected by the exciting voltage detection means exceeds a predetermined value, increases current to be passed through the excitation coils compared to a case in which the detected voltage does not exceed the predetermined value.

Description

  The present invention relates to a control device for an excitation-type rotating electrical machine, and in particular, magnetic poles that are arranged to face each other with a gap in the axial direction and that are arranged at predetermined intervals in the circumferential direction, respectively, have the gap in the axial direction. A rotor having a pair of rotor cores arranged diagonally via, a stator arranged opposite to the outer diameter side of the rotor via an air gap and generating a rotating magnetic field for rotating the rotor, and an excitation coil for exciting the magnetic poles And a control device for an excitation-type rotating electrical machine.

  Conventionally, a rotor having first and second rotor cores opposed to each other with a gap in the axial direction, and a stator that is opposed to the outer diameter side of the rotor via an air gap and generates a rotating magnetic field that rotates the rotor. Are known (for example, see Patent Document 1).

  The stator has a stator core in which stator teeth protruding toward the axis center are provided at predetermined intervals in the circumferential direction. For example, a three-phase stator coil is wound around each stator tooth. When the stator coil of each phase is energized at an appropriate timing, a rotating magnetic field that rotates the rotor is generated.

  Further, each of the pair of rotor cores is alternately arranged in the circumferential direction at the radial end, and a permanent magnet excitation magnetic pole excited by a permanent magnet, and a non-excitation permanent magnet non-excitation magnetic pole not excited by the permanent magnet, ,have. The permanent magnet exciting magnetic pole and the permanent magnet non-exciting magnetic pole are each arranged at a predetermined interval in the circumferential direction. The permanent magnet exciting magnetic pole of the first rotor core and the permanent magnet exciting magnetic pole of the second rotor core have opposite polarities. The permanent magnet excitation magnetic pole of the first rotor core and the permanent magnet non-excitation magnetic pole of the second rotor core are arranged to face each other with a gap in the axial direction, and the permanent magnet non-excitation magnetic pole of the first rotor core and the second rotor core The permanent magnet exciting magnetic poles are arranged to face each other with a gap in the axial direction. That is, the permanent magnet non-excitation magnetic pole of the first rotor core and the permanent magnet non-excitation magnetic pole of the second rotor core are arranged obliquely with a gap in the axial direction.

  The excitation-type rotating electrical machine includes an excitation coil that excites permanent magnet non-excitation magnetic poles. The amount of magnetic flux by the permanent magnet is substantially constant. When the exciting coil is energized, a magnetic flux is generated that weakens or strengthens the magnetic flux generated by the permanent magnet by exciting the non-excited magnetic pole of the permanent magnet. Therefore, according to the above-described excitation-type rotating electrical machine, the rotor can be appropriately rotated by the combined magnetic flux of the magnetic flux by the permanent magnet and the magnetic flux by the electromagnet using the exciting coil.

JP-A-8-251891

  However, in the above-described excitation-type rotating electrical machine, when the rotor rotates, the interlinkage magnetic flux acting on the excitation coil may fluctuate due to the influence of the mutual inductance of each phase stator coil of the stator with respect to the excitation coil. When such a situation occurs, an induced voltage corresponding to the fluctuation is generated in the exciting coil. At this time, if the voltage of the exciting coil increases due to the induced voltage, it is necessary to increase the power supply voltage (capacity) in order to cope with the voltage increase, resulting in an increase in cost.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a control device for an excitation-type rotating electrical machine capable of suppressing a voltage increase associated with fluctuations in linkage flux in an excitation coil. .

  The object is to have a pair of rotor cores that are opposed to each other with a gap in the axial direction, and magnetic poles that are arranged at predetermined intervals in the circumferential direction are arranged obliquely with respect to each other in the axial direction through the gap. A control device for an excitation-type rotating electrical machine, comprising: a rotor; a stator that is arranged to face the outer diameter side of the rotor via an air gap; and that generates a rotating magnetic field that rotates the rotor; and an excitation coil that excites the magnetic pole. The excitation voltage detection means for detecting the voltage generated in the excitation coil, and the excitation coil when the voltage detected by the excitation voltage detection means exceeds a predetermined value, compared with the case where the voltage does not exceed the predetermined value. This is achieved by an excitation-type rotating electrical machine control device comprising excitation current control means for increasing the current flowing through the motor.

  According to the present invention, it is possible to suppress an increase in voltage due to a change in interlinkage magnetic flux in the exciting coil.

It is a perspective view showing the structure of the excitation type rotary electric machine which is one Example of this invention. It is sectional drawing at the time of cut | disconnecting the excitation type rotary electric machine which is one Example of this invention by the plane containing an axial centerline. It is sectional drawing at the time of cut | disconnecting the excitation type rotary electric machine which is one Example of this invention by III-III shown in FIG. It is sectional drawing at the time of cut | disconnecting the excitation type rotary electric machine which is one Example of this invention by IV-IV shown in FIG. It is a block block diagram of the control apparatus of the excitation type rotary electric machine which is one Example of this invention. It is a principal block block diagram of the control apparatus of the excitation type rotary electric machine which is one Example of this invention. It is a flowchart of an example of the control routine performed in the control apparatus of the excitation type rotary electric machine which is one Example of this invention.

  Hereinafter, specific embodiments of a control device for an excitation-type rotating electrical machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the structure of an excitation-type rotating electrical machine 10 that is an embodiment of the present invention. FIG. 1 shows an excitation-type rotating electrical machine 10 with a part cut. FIG. 2 is a cross-sectional view of the excitation-type rotating electrical machine 10 according to the present embodiment cut along a plane including the axis center line. FIG. 3 shows a cross-sectional view of the excitation-type rotating electrical machine 10 of the present embodiment taken along the line III-III shown in FIG. FIG. 4 shows a cross-sectional view of the excitation-type rotating electrical machine 10 of the present embodiment taken along IV-IV shown in FIG.

  In this embodiment, the excitation-type rotating electrical machine 10 adjusts the torque for rotating the rotor around the stator by the combined magnetic flux of the magnetic flux by the permanent magnet and the magnetic flux by the electromagnet using the exciting coil, and appropriately rotates the rotor. It is a hybrid excitation type rotating electrical machine that can be used. The excitation-type rotating electrical machine 10 may be applied to, for example, an AC motor for driving a vehicle used in a hybrid vehicle or an electric vehicle, but may be used for any other purpose. .

  The excitation-type rotating electrical machine 10 includes a rotor 12 that can rotate around an axis, and a stator 14 that generates a rotating magnetic field that rotates the rotor 12. The rotor 12 is rotatably supported by the case 20 via bearings 16 and 18 at both axial ends. The stator 14 is disposed on the outer diameter side of the rotor 12 and is fixed to the case 20. The rotor 12 and the stator 14 oppose each other via an air gap 22 having a predetermined length in the radial direction.

  The stator 14 has a stator core 24 and a stator coil 28. The stator core 24 is formed in a hollow cylindrical shape. A stator tooth 26 is formed on the inner peripheral surface of the stator core 24. The stator teeth 26 protrude inward in the radial direction of the stator core 24, that is, toward the axial center. A plurality of stator teeth 26 (for example, 12 or 18) are provided in the circumferential direction on the inner circumferential surface of the stator core 24, and are provided at equal intervals along the circumferential direction.

  A status lot 27 is formed between the stator teeth 26 adjacent in the circumferential direction. That is, stator teeth 26 and status lots 27 are alternately formed on the stator core 24 in the circumferential direction. A stator coil 28 is wound around each stator tooth 26. That is, the stator coil 28 is wound around each stator tooth 26. A plurality of stator coils 28 (for example, 12 or 18) are provided in the circumferential direction on the inner circumferential surface of the stator core 24, and are provided at equal intervals along the circumferential direction. Each stator coil 28 constitutes one of a U-phase coil, a V-phase coil, and a W-phase coil when the excitation-type rotating electrical machine 10 is applied to, for example, a three-phase AC motor.

  The stator core 24 is divided in the axial direction, and includes a first stator core 30, a second stator core 32, and a third stator core 34. The first to third stator cores 30 to 34 are each formed in a hollow cylindrical shape and are arranged in the axial direction. The first and third stator cores 30 and 34 are disposed at both ends in the axial direction. The second stator core 32 is disposed at the center in the axial direction. The second stator core 32 is sandwiched between the first stator core 30 and the third stator core 34 in the axial direction, and is fixed to the end surfaces near the center in the axial direction of the first and third stator cores 30 and 34 by adhesion or the like.

  The first to third stator cores 30 to 34 have substantially the same inner diameter and the same outer diameter. Each of the first to third stator cores 30 to 34 has an annular back yoke portion and a stator tooth portion that protrudes from the inner peripheral surface of the back yoke portion constituting the stator tooth 26 toward the axial center. And consist of In each of the first to third stator cores 30 to 34, the back yoke portion and the stator teeth portion may be formed integrally with each other, but may be provided separately from each other. The stator coil 28 is formed so as to penetrate the first to third stator cores 30 to 34 in the axial direction in the status lot 27 between the stator teeth 26 aligned in the circumferential direction.

  Each of the first and third stator cores 30 and 34 is a magnetic steel sheet core formed by laminating a plurality of insulating coated steel sheets in the axial direction. The second stator core 32 is a dust core formed of a soft magnetic material such as iron, specifically, a material obtained by compression-molding a soft magnetic powder coated with an insulating coating. The magnetic resistance in the axial direction of the second stator core 32 is smaller than the magnetic resistance in the axial direction of the first and third stator cores 30 and 34.

  A thin cylindrical yoke 36 is provided on the outer diameter side of the stator core 24. The yoke 36 is formed so as to cover the entire outer circumference of the first to third stator cores 30 to 34, and supports the first to third stator cores 30 to 34. Like the second stator core 32, the yoke 36 is a dust core formed of a material obtained by compression-molding an insulating-coated soft magnetic powder. The magnetic resistance in the axial direction of the yoke 36 is smaller than the magnetic resistance in the axial direction of the first and third stator cores 30 and 34. The yoke 36 and the second stator core 32 may be formed integrally with each other. The yoke 36 is bonded and fixed to the outer diameter surfaces of the first stator core 30 and the third stator core 34. The first stator core 30 and the third stator core 34 are magnetically coupled to each other via the yoke 36 and the second stator core 32.

  The stator core 24 has an attachment portion 38 that protrudes to the outer diameter side for attaching and fixing the stator 14 to the case 20. The attachment portion 38 is formed of a plurality of electromagnetic steel plates laminated in the axial direction. The attachment portion 38 includes an attachment portion 38a formed integrally with the first stator core 30, an attachment portion 38b formed integrally with the third stator core 34, and an attachment portion 38c sandwiched between both attachment portions 38a, 38b. Have. The attachment portion 38 c is disposed on the outer diameter side of the second stator core 32. Note that the attachment portion 38c may be formed integrally with the second stator core 32 instead of being formed by a plurality of electromagnetic steel plates laminated in the axial direction. A plurality of (for example, three) mounting portions 38 are provided in the circumferential direction. The attachment portion 38 is provided with a through hole 40 penetrating in the axial direction. The stator 14 is fixed to the case 20 by fastening a bolt 42 that passes through the through hole 40 of the attachment portion 38 to the case 20.

  The rotor 12 is disposed on the inner diameter side of the stator 14. The rotor 12 includes a shaft 50 and a rotor core 52. The shaft 50 extends in the axial direction, and extends from the axial end of the stator 14 at both axial ends. The shaft 50 only needs to extend from the axial end of the stator 14 at least on one side in the axial direction. The shaft 50 is made of a material having a predetermined iron loss, specifically, carbon steel such as S45C. The rotor core 52 has an outer diameter side rotor core 54 that is disposed on the outer diameter side of the shaft 50 and supported by the shaft 50. The outer diameter side rotor core 54 is formed in a hollow cylindrical shape, and is fixed to the outer diameter surface of the shaft 50.

  The outer diameter side rotor core 54 is divided in the axial direction, and includes a first outer diameter side rotor core 56 and a second outer diameter side rotor core 58. The first and second outer diameter side rotor cores 56 and 58 are each formed in a hollow cylindrical shape, and are disposed on the outer diameter side of the shaft 50 and supported by the shaft 50. The first and second outer-diameter-side rotor cores 56 and 58 are each formed by laminating a plurality of insulating coated steel sheets in the axial direction. The first outer diameter side rotor core 56 and the second outer diameter side rotor core 58 are separated from each other with an annular gap 60 in the axial direction. The gap 60 is formed to have substantially the same size (width) from the inner diameter side portion to the outer diameter side portion of the first and second outer diameter side rotor cores 56 and 58.

  The outer diameter surface of the first outer diameter side rotor core 56 faces the inner diameter surface of the first stator core 30 in the radial direction. That is, the outer diameter surface of the first outer diameter side rotor core 56 and the inner diameter surface of the first stator core 30 are opposed to each other in the radial direction. Further, the outer diameter surface of the second outer diameter side rotor core 58 faces the inner diameter surface of the third stator core 34 in the radial direction. That is, the outer diameter surface of the second outer diameter side rotor core 58 and the inner diameter surface of the third stator core 34 are opposed to each other in the radial direction. The gap 60 faces the inner diameter surface of the second stator core 32 and is provided on the inner diameter side of the second stator core 32.

  A rotor tooth 62 is formed on the outer periphery of the first outer diameter side rotor core 56. The rotor teeth 62 protrude outward in the radial direction of the first outer diameter side rotor core 56. A plurality of (for example, six) rotor teeth 62 are provided in the circumferential direction on the outer peripheral surface of the first outer diameter side rotor core 56, and are provided at equal intervals along the circumferential direction.

  Permanent magnets 64 are attached between the rotor teeth 62 adjacent to each other in the circumferential direction so as to be adjacent to the rotor teeth 62. The permanent magnet 64 is disposed on the outer diameter side of the first outer diameter side rotor core 56. The permanent magnet 64 is, for example, a ferrite magnet. A plurality of permanent magnets 64 (for example, six) are provided in the circumferential direction, and are provided at regular intervals along the circumferential direction. Each permanent magnet 64 has a predetermined width (angle) in the circumferential direction and a predetermined thickness in the radial direction. Each permanent magnet 64 is magnetized to a predetermined polarity (for example, the outer diameter side is an N pole and the inner diameter side is an S pole).

  The outer diameter side end surface of the permanent magnet 64 and the outer diameter side end surface of the rotor teeth 62 are formed at substantially the same distance from the axis center. The outer diameter side end surface of the permanent magnet 64 may be positioned slightly radially inward from the outer diameter side end surface of the rotor teeth 62. The first outer diameter side rotor core 56 has a permanent magnet excitation magnetic pole excited by the permanent magnet 64 and a non-excitation permanent magnet non-excitation magnetic pole that is not excited by the permanent magnet 64. This permanent magnet non-excitation magnetic pole is formed in the rotor teeth 62. These permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles are alternately arranged in the circumferential direction. The first outer diameter side rotor core 56 has magnetic poles having different polarities at every predetermined angle, and has a predetermined number (for example, 12) of poles in the circumferential direction by permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles. ing.

  A rotor tooth 66 is formed on the outer periphery of the second outer diameter side rotor core 58. The rotor teeth 66 protrude outward in the radial direction of the second outer diameter side rotor core 58. A plurality of (for example, six) rotor teeth 66 are provided in the circumferential direction on the outer peripheral surface of the second outer diameter side rotor core 58, and are provided at equal intervals along the circumferential direction.

  Permanent magnets 68 are attached adjacent to the rotor teeth 66 between the rotor teeth 66 adjacent to each other in the circumferential direction. The permanent magnet 68 is disposed on the outer diameter side of the second outer diameter side rotor core 58. The permanent magnet 68 is, for example, a ferrite magnet. A plurality (for example, six) of permanent magnets 68 are provided in the circumferential direction, and are provided at regular intervals along the circumferential direction. Each permanent magnet 68 has a predetermined width (angle) in the circumferential direction and a predetermined thickness in the radial direction. Each permanent magnet 68 is magnetized to a predetermined polarity (for example, the outer diameter side is an S pole and the inner diameter side is an N pole) different from the polarity of the permanent magnet 64. That is, the permanent magnet 68 and the permanent magnet 64 have opposite polarities.

  The outer diameter side end surface of the permanent magnet 68 and the outer diameter side end surface of the rotor teeth 66 are formed at positions that are substantially the same distance from the center of the shaft. The outer diameter side end face of the permanent magnet 68 may be positioned slightly radially inward from the outer diameter side end face of the rotor teeth 66. The second outer diameter side rotor core 58 has a permanent magnet excitation magnetic pole excited by the permanent magnet 68 and a non-excitation permanent magnet non-excitation magnetic pole that is not excited by the permanent magnet 68. This permanent magnet non-excitation magnetic pole is formed in the rotor tooth 66. These permanent magnet excitation magnetic poles and permanent magnet non-excitation magnetic poles are alternately arranged in the circumferential direction. The second outer diameter side rotor core 58 has magnetic poles having different polarities for each predetermined angle, and has the same number of poles as the first outer diameter side rotor core 56 in the circumferential direction by the permanent magnet excitation magnetic pole and the permanent magnet non-excitation magnetic pole. It has a number (for example, 12) of poles.

  The permanent magnet exciting magnetic pole of the first outer diameter side rotor core 56 and the permanent magnet non-exciting magnetic pole of the second outer diameter side rotor core 58 are arranged to face each other through the gap 60 in the axial direction. That is, the permanent magnet 64 of the first outer diameter side rotor core 56 and the rotor teeth 66 of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction. Further, the permanent magnet non-excitation magnetic pole of the first outer diameter side rotor core 56 and the permanent magnet excitation magnetic pole of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction. That is, the rotor teeth 62 of the first outer diameter side rotor core 56 and the permanent magnets 68 of the second outer diameter side rotor core 58 are arranged to face each other via the gap 60 in the axial direction. The permanent magnet exciting magnetic poles of the first and second outer diameter side rotor cores 56 and 58 are arranged obliquely with respect to each other through the gap 60 in the axial direction, and the permanent magnet non-exciting magnetic poles are They are arranged obliquely through the gap 60 in the axial direction.

  In the gap 60, that is, between the first outer diameter side rotor core 56 and the second outer diameter side rotor core 58, there is an exciting coil 70 for exciting the permanent magnet non-exciting magnetic poles of the rotor teeth 62, 66. Is arranged. The exciting coil 70 is made of an electric wire such as a copper wire and fills almost the entire area of the gap 60. The exciting coil 70 is formed in an annular shape around the shaft 50 and is toroidally wound. The exciting coil 70 is formed so that the axial thickness in each part in the radial direction is substantially uniform. The exciting coil 70 is disposed on the outer diameter side of the shaft 50 and is disposed on the inner diameter side of the second stator core 32, and faces the second stator core 32 in the radial direction.

  The exciting coil 70 is fixed to the stator 14 (specifically, the second stator core 32 of the stator core 24). The excitation coil 70 is fixed to the stator 14 using a holding member 71. The holding member 71 is a clip member made of a resin or the like formed in a U-shaped cross section or a U-shaped cross section so that the annular excitation coil 70 can be held from the inner diameter side, and in the circumferential direction around the shaft 50. A plurality are provided.

  As a method for fixing the exciting coil 70 to the stator 14, the exciting coil 70 may be directly fixed to the first to third stator cores 30 to 34, for example, the first stator core 30 and the third stator core 34. The exciting coil 70 may be fixed to the stator 14 by making a hole in the axial end face facing each other or the inner diameter face of the second stator core 32 and hooking the holding member 71 through the hole.

  As shown in FIG. 1, the lead wire 77 of the exciting coil 70 passes through the slot between the stator teeth 26 of the stator core 24 of the stator 14 so as to pass through in the axial direction. And connected to a control device 100 described later. A direct current is supplied to the exciting coil 70 via a control device 100 from a direct current power source (for example, a vehicle-mounted battery). When a direct current is supplied to the exciting coil 70, a magnetic flux that penetrates the inner diameter side (axial center side) of the exciting coil 70 in the axial direction is generated. This amount of magnetic flux has a magnitude corresponding to the direct current supplied to the exciting coil 70.

  The shaft 50 is formed in a hollow shape. The shaft 50 includes a large diameter cylindrical portion 72 having a relatively large diameter and small diameter cylindrical portions 74 and 76 having a relatively small diameter. The small diameter cylindrical portions 74 and 76 are provided at both axial ends. The large-diameter cylindrical portion 72 is provided at the center in the axial direction, and is sandwiched between small-diameter cylindrical portions 74 and 76 at both ends in the axial direction. The shaft 50 is supported by the case 20 via the bearings 16 and 18 in the small diameter cylindrical portions 74 and 76. The first and second outer-diameter-side rotor cores 56 and 58 are disposed on the outer-diameter side of the large-diameter cylindrical portion 72 and supported by the large-diameter cylindrical portion 72, and are arranged on the outer-diameter surface of the large-diameter cylindrical portion 72. It is fixed.

  The rotor core 52 has an inner diameter side rotor core 80 that is disposed on the inner diameter side of the shaft 50 and supported by the shaft 50. The inner diameter side rotor core 80 is disposed on the inner diameter side of the first outer diameter side rotor core 56 and the second outer diameter side rotor core 58 of the rotor core 52 and on the inner diameter side of the exciting coil 70. A hollow space 82 is formed in the large-diameter cylindrical portion 72 of the shaft 50. The inner diameter side rotor core 80 is accommodated in the hollow space 82 of the large diameter cylindrical portion 72, and is bonded and fixed to the inner diameter surface of the large diameter cylindrical portion 72. The inner diameter side rotor core 80 is formed of a soft magnetic material, specifically, a material obtained by compression molding a soft magnetic powder coated with an insulating coating. The inner diameter side rotor core 80 is formed of a material whose iron loss is smaller than that of the shaft 50.

  The inner diameter side rotor core 80 is divided in the circumferential direction, and includes a plurality of (for example, six) rotor core pieces 84 formed in a fan shape when viewed from the axial direction. The division in the circumferential direction of the inner diameter side rotor core 80 is performed at equal intervals (equal angles) in the circumferential direction, and the respective rotor core pieces 84 have the same shape. The number of divisions in the circumferential direction of the inner diameter side rotor core 80, that is, the number of rotor core pieces 84 is the number of poles of the first and second outer diameter side rotor cores 56, 58 in the outer diameter side rotor core 54 or a divisor of the number of poles. For example, when the number of poles is “12”, the number of divisions is “2”, “3”, “4”, “6”, or “12” (in FIG. 3 and FIG. 4, the number of divisions is “6”. ”).

  The division in the circumferential direction of the inner diameter side rotor core 80 is also performed by permanent magnets 64 alternately arranged in the circumferential direction in the axial centers of the rotor 12 and the shaft 50 and the first and second outer diameter side rotor cores 56 and 58 of the rotor 12. , 68 and the rotor teeth 62, 66 (that is, the permanent magnet excitation magnetic pole and the permanent magnet non-excitation magnetic pole) are performed on a line passing through the circumferential center of each of two or more of them. That is, each plane including the dividing surface in the circumferential direction of the inner diameter side rotor core 80 passes through the axial center of the rotor 12 or the shaft 50, and any of the permanent magnets 64 and 68 and the rotor teeth 62 and 66 (that is, the permanent magnets). Passes through the center in the circumferential direction of the excitation magnetic pole and permanent magnet non-excitation magnetic pole).

  Further, the inner diameter side rotor core 80 has notch holes 86 and 88 that are vacant in the axial direction at the axial end portion. The notches 86 and 88 are provided at both ends in the axial direction. The cutout holes 86 and 88 are formed in a tapered shape or a stepped shape so that the diameter decreases from the axial end surface to the axial center. The diameters of the axial end portions (the shallowest portion) of the cutout holes 86 and 88 substantially coincide with the inner diameter of the large-diameter cylindrical portion 72 of the shaft 50, and the axial center portions (the deepest portion) of the cutout holes 86 and 88. The diameter is a predetermined diameter. The inner diameter side rotor core 80 has a predetermined thickness in the radial direction at the axially central portion, and has a thickness smaller than the thickness of the axially central portion at each axial end portion. The radial thickness of the large-diameter cylindrical portion 72 of the shaft 50 is set to a thickness that maintains the strength necessary for transmitting the motor torque, and the radial thickness at the axial central portion of the inner diameter side rotor core 80. Is set to a predetermined thickness that does not saturate the magnetic flux generated by the exciting coil 70, the radial thickness at the axially central portion of the inner diameter side rotor core 80 is the radial thickness of the large diameter cylindrical portion 72 of the shaft 50. Greater than thickness.

  The cutout hole 86 and the cutout hole 88 communicate with each other on the axial center side, and are connected through a through hole 89 that penetrates the deepest portions in the axial direction. That is, the inner diameter side rotor core 80 is formed in a hollow shape so that the through hole 89 is formed. The cutout holes 86 and 88 and the through hole 89 of the inner diameter side rotor core 80 are all provided on the axial center line of the shaft 50. The through hole 89 of the inner diameter side rotor core 80 has substantially the same diameter as that of the deepest part of the cutout holes 86 and 88.

  The rotor 12 is divided into two in the axial direction. The shaft 50 is divided into two in the axial direction, and includes two cup-shaped members 90 and 92 that are fitted to each other. The axial division position of the shaft 50 is substantially the center in the axial direction. The cup-shaped member 90 has a small-diameter cylindrical portion 74 and a part of the large-diameter cylindrical portion 72 (specifically, a half on the side connected to the small-diameter cylindrical portion 74). The cup-shaped member 92 has a small-diameter cylindrical portion 76 and a part of the large-diameter cylindrical portion 72 (specifically, a half on the side connected to the small-diameter cylindrical portion 76). The shaft 50 is formed by fitting the cup-shaped member 90 and the cup-shaped member 92 with each other. The cup-shaped member 90 supports the first outer diameter side rotor core 56, and the cup-shaped member 92 supports the second outer diameter side rotor core 58. The first outer diameter side rotor core 56 is fixed to the outer diameter surface of the cup-shaped member 90, and the second outer diameter side rotor core 58 is fixed to the outer diameter surface of the cup-shaped member 92.

  The cup-shaped members 90 and 92 are respectively formed with bolt holes 94 and 96 that are open in the axial direction on the center of the shaft. The bolt holes 94 and 96 have substantially the same diameter as the diameter of the through hole 89 of the inner diameter side rotor core 80. Bolts 98 are inserted into the bolt holes 94 and 96 of the cup-shaped members 90 and 92 and the through holes 89 of the inner diameter side rotor core 80. The cup-shaped member 90 and the cup-shaped member 92 are fastened by a bolt 98 while being fitted to each other.

  The inner diameter side rotor core 80 may be divided into two in the axial direction. In this case, the axially divided position of the inner diameter side rotor core 80 may correspond to the axially divided position of the shaft 50, or may be substantially the center in the axial direction. One of the divided inner diameter side rotor cores 80 is bonded and fixed to the inner diameter surface of the cup-shaped member 90 of the shaft 50, and the other divided one of the inner diameter side rotor core 80 is fixed to the inner diameter surface of the cup-shaped member 92. You can do that.

  FIG. 5 is a block diagram of the control device 100 for the excitation-type rotating electrical machine 10 according to the present embodiment. FIG. 6 shows a block diagram of the main part of the control device 100 for the excitation-type rotating electrical machine 10 of this embodiment. In the present embodiment, the excitation type rotating electrical machine 10 is such that the motor 14 is a three-phase synchronous AC motor, and one end of three coils of U phase, V phase, and W phase are commonly connected to a neutral point. It has a configuration. The control device 100 is a device that controls the rotation of the rotor 12 in the excitation-type rotating electrical machine 10.

  The control device 100 includes an inverter 102 that converts DC power into AC power. The inverter 102 is interposed between the DC power source 104 and the stator coil 28 of each phase of the excitation type rotating electrical machine 10. The inverter 102 supplies AC power for generating torque to the excitation-type rotating electrical machine 10 using the DC power source 104. Note that a boost converter that boosts the DC voltage of the DC power supply 104 by turning on / off the pair of switching elements by using the energy storage action of the reactor may be provided between the inverter 102 and the DC power supply 104. The DC power source 104 is, for example, an in-vehicle battery such as a lithium ion battery or a hydrogen battery.

  The inverter 102 has upper and lower arms corresponding to the three-phase stator coils 28 of the excitation-type rotating electrical machine 10. The upper and lower arms of each phase include a switching element that is an upper arm element and a switching element that is a lower arm element, and are connected in series between the positive terminal and the negative terminal of the DC power supply 104. Each switching element is a power transistor such as an IGBT. The U-phase upper and lower arms, the V-phase upper and lower arms, and the W-phase upper and lower arms are connected in parallel between the positive terminal and the negative terminal of the DC power supply 104. An intermediate point between the upper arm element and the lower arm element of the upper and lower arms of each phase is connected to the other end of the stator coil 28 of the phase of the excitation type rotating electrical machine 10 via a lead wire 105.

  The inverter 102 converts the DC power of the DC power source 104 into AC power and outputs it by alternately turning on / off the upper arm element and the lower arm element for each phase. On / off of each switching element which is the upper arm element and the lower arm element is controlled by a control signal from the control device 100. The control device 100 has an electronic control unit (ECU) mainly composed of a microcomputer, and is excited by software processing by executing a program stored in advance by the CPU and / or hardware processing by an electronic circuit. The operation of the rotating electrical machine 10 and the inverter 102 is controlled.

  The control device 100 includes a current sensor 106 and a resolver 108. The current sensor 106 outputs signals corresponding to the actual currents Iu, Iv, and Iw flowing through the stator coils 28 of the respective phases of the excitation type rotating electrical machine 10. Since the sum of instantaneous values of the three-phase actual currents Iu, Iv, and Iw is zero, the current sensor 106 outputs a signal corresponding to the two-phase actual current, and the remaining one-phase actual current May be obtained by calculation (for example, Iu = − (Iv + Iw)). The resolver 108 outputs an A-phase signal and a B-phase signal corresponding to the rotor rotation angle of the excitation type rotating electrical machine 10.

  An R / D converter 110 is connected to the resolver 108. The A-phase signal and the B-phase signal indicating the rotor rotation angle by the resolver 108 are supplied to the R / D converter 110. The R / D converter 110 converts the A phase signal and the B phase signal from the resolver 108 into digital data. A counter 112 is connected to the R / D converter 110. The digital signals of the A phase and B phase by the R / D converter 110 are supplied to the counter 112. The counter 112 counts pulses for the A-phase and B-phase digital signals from the R / D converter 110 and detects the rotor rotation angle based on the count value.

  The control device 100 further includes a three-phase to two-phase current converter 114 connected to the output of the current sensor 106. Signals indicating the actual currents Iu, Iv, and Iw of each phase of the motor by the current sensor 106 are supplied to the three-phase to two-phase current converter 114. The three-phase to two-phase current converter 114 is also connected to the output of the counter 112. A signal indicating the rotor rotation angle by the counter 112 is supplied to the three-phase to two-phase current converter 114. The three-phase to two-phase current conversion unit 114 converts the three-phase actual currents Iu, Iv, and Iw of the excitation-type rotating electrical machine 10 input from the current sensor 106 into the two-phase d-axis current Id and the rotor rotation angle. By converting the coordinates to the q-axis current Iq, the d-axis current Id and the q-axis current Iq are calculated based on the three-phase actual currents Iu, Iv, and Iw.

  The control device 100 also includes a torque control unit 116. Torque control unit 116 receives torque command value information indicating the torque to be generated by excitation-type rotating electrical machine 10 that is set according to a predetermined map or the like using an accelerator operation amount or the like. The torque control unit 116 calculates a d-axis current command value Id * and a q-axis current command value Iq * to be supplied to the d-axis and the q-axis, respectively, based on the supplied torque command value, modulation factor, and the like.

  The control device 100 also includes a current control unit 118. Information on the deviation between the actual value Id calculated in the three-phase to two-phase current converter 114 and the command value Id * calculated in the torque controller 116 is input to the current controller 118. At the same time, information on the deviation of the q-axis current between the actual value Iq calculated by the three-phase to two-phase current converter 114 and the command value Iq * calculated by the torque controller 116 is input. The current control unit 118 calculates the d-axis voltage command value Vd and the q-axis voltage command value Vq so that both the deviation of the input d-axis current and the deviation of the q-axis current converge to zero.

  A voltage calculation unit 120 is connected to the current control unit 118. Information on the command value Vd for the d-axis voltage and the command value Vq for the q-axis voltage calculated by the current control unit 118 is supplied to the voltage calculation unit 120. The voltage calculation unit 120 calculates the modulation factor based on the d-axis voltage command value Vd and the q-axis voltage command value Vq from the current control unit 118. The voltage control unit 116 is connected to the voltage calculation unit 120. In calculating the d-axis current command value Id * and the q-axis current command value Iq *, the torque control unit 116 performs field weakening control in the field weakening control unit 122 based on the modulation rate from the voltage calculation unit 120.

  The control device 100 also includes a voltage control unit 124 connected to the output of the current control unit 118 and the output of the counter 112. Information on the command value Vd of the d-axis voltage and the command value Vq of the q-axis voltage calculated by the current control unit 118 is input to the voltage control unit 124, and information on the rotor rotation angle detected by the counter 112 is input to the voltage control unit 124. Entered. The voltage control unit 124 also receives information on the voltage of the DC power supply 104. The voltage control unit 124 converts the input dq axis voltage command values Vd and Vq into three-phase voltage command values Vu, Vv, and Vw using the rotor rotation angle of the excitation-type rotating electrical machine 10, Three-phase voltage command values Vu, Vv, Vw are calculated based on the voltage command values Vd, Vq on the dq axis. The three-phase reference voltage command values Vu, Vv, and Vw are signals having equal amplitudes and phases shifted by an electrical angle of 120 °.

  The voltage control unit 124 turns on the upper and lower arms of the inverter 102 based on the result of voltage comparison between the calculated three-phase voltage command values Vu, Vv, Vw and a carrier signal (for example, a triangular wave carrier wave) having a predetermined period. A control signal for commanding off / off (specifically, a PWM signal whose pulse width is modulated) is generated. Then, the control signal is output to the inverter 102. When the control signal applied to the inverter 102 is supplied, the inverter 102 converts the DC power of the DC power supply 104 into AC power in accordance with the control signal, and the stator of each phase of the excitation-type rotating electrical machine 10 via the lead wire 105. Supply to the coil 28.

  The control device 100 also includes a chopper circuit 130 that converts direct current power into direct current. The chopper circuit 130 is interposed between the DC power source 104 and the exciting coil 70 included in the exciting rotary electric machine 10. The chopper circuit 130 supplies DC power for generating torque to the excitation-type rotating electrical machine 10 using the DC power source 104. Specifically, for example, the DC power of the DC power supply 104 is stepped down and output by switching on / off of a switching element which is a power transistor such as an IGBT.

  The control device 100 also includes a speed calculation unit 132 connected to the output of the counter 112. A signal indicating the rotor rotation angle by the counter 112 is supplied to the speed calculation unit 132. The speed calculation unit 132 calculates the rotation speed of the excitation-type rotating electrical machine 10 based on the rotor rotation angle.

  The torque control unit 116 includes an excitation current table 136 used for calculating an excitation current for exciting the excitation coil 70. Information on the torque command value from the outside is input to the excitation current table 136, and information on the rotational speed from the speed calculation unit 132 and information on the DC voltage of the DC power supply 104 are input. The excitation current table 136 stores information on command values serving as a reference of excitation current for exciting the excitation coil 70 derived from the relationship between the torque command value and the rotation speed. The information stored in the excitation current table 136 is distributed to the excitation coil 70 so that the loss (mainly copper loss) generated in the excitation coil 70 is minimized based on the relationship between the torque command value and the rotation speed. This defines the direct current excitation current. Based on the input torque command value and the rotational speed, the torque control unit 116 refers to the excitation current table 136 and calculates a reference value (that is, loss becomes minimum) of the excitation current command value Idr *. .

  The control device 100 also includes a current sensor 138 and a current control unit 140. The current sensor 138 outputs a signal corresponding to the actual current Idr flowing through the exciting coil 70 of the exciting rotating electrical machine 10. Information on the deviation between the actual value Idr from the current sensor 138 and the command value Idr * calculated by the torque control unit 116 of the excitation current flowing through the excitation coil 70 is input to the current control unit 140. The current control unit 140 calculates a voltage command value Vdr to be applied to the excitation coil 70 so that the deviation between the actual value Idr of the input excitation current and the command value Idr * converges to zero.

  A voltage control unit 142 is connected to the current control unit 140. Information on the voltage command value Vdr of the exciting coil 70 calculated by the current control unit 140 is supplied to the voltage control unit 142. The voltage control unit 142 controls the switching element of the chopper circuit 130 to be turned on / off so that the voltage command value Vdr from the current control unit 140 is applied to the exciting coil 70 (specifically, the pulse width is PWM signal to be modulated). Then, the control signal is output toward the chopper circuit 130. When the control signal applied to the chopper circuit 130 is supplied, the chopper circuit 130 steps down the DC power of the DC power source 104 to a desired voltage in accordance with the control signal, and the excitation type rotating electrical machine 10 is connected via the lead wire 77. The excitation coil 70 is supplied.

  In the structure of the exciting rotating electrical machine 10 described above, when a direct current is supplied to the annular exciting coil 70 using the control device 100, the magnetic flux penetrating the inner diameter side (axial center side) of the exciting coil 70 in the axial direction is changed. Occur. The magnetic flux generated by the electromagnet using the exciting coil 70 is the permanent magnet non-excited magnetic pole of the first or second outer diameter side rotor cores 56, 58 → the inner diameter side rotor core 80 → the permanent of the second or first outer diameter side rotor cores 58, 56. Magnet non-excitation magnetic pole → air gap 22 → stator core 24 → air gap 22 → first or second outer diameter side rotor cores 56 and 58 are distributed along a path consisting of permanent magnet non-excitation magnetic poles. When such a magnetic flux is generated, the permanent magnet non-excitation magnetic poles of the first and second outer diameter side rotor cores 56 and 58 are excited. The magnetic flux generated by the electromagnet weakens or strengthens the magnetic flux generated by the permanent magnets 64 and 68. The amount of magnetic flux generated by the electromagnet is adjusted according to the magnitude of the direct current flowing through the exciting coil 70.

  Therefore, according to the present embodiment, the torque for rotating the rotor 12 around the stator 14 can be adjusted by the combined magnetic flux of the magnetic flux generated by the permanent magnets 64 and 68 and the magnetic flux generated by the electromagnet using the exciting coil 70. 12 can be rotated appropriately.

  In the present embodiment, the torque control unit 116 of the control device 100 includes an excitation voltage calculation unit 144. Information on the actual values Id and Iq of the d-axis current and the q-axis current calculated in the three-phase to two-phase current converter 114 is input to the excitation voltage calculation unit 144, and the excitation coil 70 by the current sensor 138 is input to the excitation coil 70. Information on the actual value Idr of the flowing current is input. The excitation voltage calculation unit 144 is estimated to be generated at both ends of the excitation coil 70 based on the actual values Id and Iq of the d-axis current and the q-axis current and the actual value Idr of the current flowing in the excitation coil 70. Calculate the DC excitation voltage. This voltage calculation may be performed using a predetermined formula or map.

  An excitation current calculation unit 146 is connected to the excitation voltage calculation unit 144. Information on the excitation voltage estimated value of the excitation coil 70 calculated by the excitation voltage calculation unit 144 is supplied to the excitation current calculation unit 146. The excitation current calculation unit 146 also receives information on the excitation current command value Idr * which is a reference based on the torque command value and the rotation speed calculated with reference to the excitation current table 136 as described above. . The excitation current calculation unit 146 corrects the reference excitation current command value Idr * calculated using the excitation current table 136 according to the excitation voltage estimated value of the excitation coil 70 from the excitation voltage calculation unit 144 as described later. The excitation current command value Idr * to be output is generated.

  The torque control unit 116 also includes a maximum torque control unit 148 and an equal torque table 150. Information on the torque command value from the outside is input to the maximum torque control unit 148 and information on the excitation current command value Idr * output from the excitation current calculation unit 146 is input. The maximum torque control unit 148 performs maximum torque control for deriving a current vector that minimizes the current amplitude among current vectors that cause the excitation-type rotating electricity 10 to generate the same torque corresponding to the torque command value. This maximum torque control maximizes the torque with respect to the current phase angle when the amplitude of the current vector is constant. By effectively utilizing the reluctance torque, the current can be obtained while obtaining the same output. Since the copper loss corresponding to the square of the amplitude can be minimized, high-efficiency control of the excitation-type rotating electrical machine 10 can be realized.

  The field weakening control unit 122 is connected to the maximum torque control unit 148. Information on the d-axis current command value Id * calculated by the maximum torque control unit 148 is supplied to the field weakening control unit 122. The field weakening control unit 122 performs field weakening control based on the d-axis current command value Id * from the maximum torque control unit 148 and the modulation factor from the voltage calculation unit 120, and the d-axis current command value Id after the field weakening control. The information of * is output to the current control unit 118 side.

  In addition, information on the torque command value from the outside and information on the excitation current command value Idr * output from the excitation current calculation unit 146 are input to the equal torque table 150, and the field weakening control unit 122. The information of the d-axis current command value Id * output from is input. In the equal torque table 148, even if the current command value Idr * to the exciting coil 70 is changed, the q-axis current command for equalizing the torque generated in the entire excitation rotating electric machine 10 before and after the change of the current command value Idr *. Information of value Iq * is stored. The torque control unit 116 calculates the q-axis current command value Iq * by referring to the equal torque table 150 based on the input torque command value, excitation current command value Idr *, and d-axis current command value Id *. Then, the information is output to the current control unit 118 side.

  FIG. 7 shows a flowchart of an example of a control routine executed by the torque control unit 116 in the control device 100 for the excitation-type rotating electrical machine 10 of the present embodiment.

  In the control device 100 of the present embodiment, when the torque command value information is input from the outside (step 100), the torque control unit 116 is excited based on the torque command value and the rotational speed of the excitation-type rotating electrical machine 10. With reference to the current table 136, the command value Idr * of the excitation current supplied to the excitation coil 70 that minimizes the loss (copper loss) is calculated (step 102), and the excitation voltage calculation unit 144 uses the d-axis current. Based on the actual values Id and Iq of the q-axis current and the actual value Idr of the current flowing in the exciting coil 70, a DC exciting voltage estimated to be generated at both ends of the exciting coil 70 is calculated (step 104). .

  After the above calculation, the torque control unit 116 determines whether or not the calculated estimated excitation voltage of the excitation coil 70 exceeds a predetermined voltage threshold value in the excitation current calculation unit 146 (step 106). . The predetermined voltage threshold only needs to be set based on the power supply voltage of the DC power supply 104. For example, the predetermined voltage threshold value is obtained by subtracting a minute voltage from the power supply voltage of the DC power supply 104 or the power supply of the DC power supply 104. Any value such as 90% of the voltage may be used.

  Even if the interlinkage magnetic flux acting on the exciting coil 70 fluctuates due to the mutual inductance of the stator coil 28 of each phase, as long as the exciting voltage generated in the exciting coil 70 does not exceed the power supply voltage of the DC power supply 104. It is possible to generate a desired torque according to the command value of the exciting current to the exciting coil 70 using the DC power source 104 as it is. On the other hand, when the interlinkage magnetic flux acting on the excitation coil 70 fluctuates as described above, if the excitation voltage generated in the excitation coil 70 exceeds the power supply voltage of the DC power supply 104, the excitation coil can be used by using the DC power supply 104 as it is. It becomes difficult to generate a desired torque according to the command value of the excitation current to 70.

  When the excitation current calculation unit 146 determines that the estimated value of the excitation voltage of the excitation coil 70 does not exceed the predetermined voltage threshold value, the torque control unit 116 uses the excitation current table 136 to calculate the reference. The excitation current command value Idr * is maintained as the excitation current to be passed through the excitation coil 70 as it is, and the excitation current command value Idr * is output (step 108). When this processing is performed, the reference excitation current command value Idr * calculated using the excitation current table 136 is distributed to the excitation coil 70, so that the rotor is driven by the magnetic flux generated by the electromagnet using the excitation coil 70 as per the reference. Torque that rotates 12 is generated.

  On the other hand, when the torque controller 116 determines in the excitation current calculator 146 that the estimated value of the excitation voltage of the excitation coil 70 exceeds a predetermined voltage threshold, the excitation current to be passed through the excitation coil 70. Is increased from the reference excitation current command value Idr * calculated using the excitation current table 136, and the excitation current command value Idr * is output (step 110). Note that the increase amount of the excitation current command value Idr * per calculation cycle may be set to a predetermined amount.

  When the exciting current flowing through the exciting coil 70 increases, the magnetic flux penetrating the inner diameter side of the exciting coil 70 is changed by the increased amount of the exciting current, thereby causing the exciting coil 70 to counteract the increase in the exciting current. Occurs, and the excitation voltage generated in the excitation coil 70 decreases. Accordingly, when the processing of step 110 is performed, the excitation current command value Idr * to be passed through the excitation coil 70 is a normal value (specifically, the reference excitation current command value Idr * calculated using the excitation current table 136). ), The excitation voltage generated in the excitation coil 70 is smaller than the normal value (specifically, the excitation voltage when the reference excitation current command value Idr * is passed through the excitation coil 70). .

  In this regard, according to the control device 100 of the present embodiment, when the excitation voltage generated in the excitation coil 70 exceeds a predetermined voltage threshold value, the excitation to be circulated through the excitation coil 70 as compared with the case where the excitation voltage does not exceed the predetermined voltage threshold. By increasing the current, the excitation voltage generated in the excitation coil 70 can be decreased. When the excitation voltage generated in the excitation coil 70 does not exceed a predetermined voltage threshold value, the excitation current flowing through the excitation coil 70 is controlled so that the copper loss generated in the excitation coil 70 is minimized. When the excitation voltage generated in the coil 70 exceeds a predetermined voltage threshold, the excitation coil 70 is set so that the excitation voltage generated in the excitation coil 70 becomes a predetermined value or less not exceeding the predetermined voltage threshold. The exciting current to be circulated can be controlled. That is, the control for minimizing the copper loss that occurs in the exciting coil 70 is performed with the exciting current flowing through the exciting coil 70 depending on whether the exciting voltage generated in the exciting coil 70 does not exceed the predetermined voltage threshold value or not. It is possible to switch between copper loss minimum excitation control) and control for keeping the excitation voltage constant (excitation voltage reduction control).

  When the excitation voltage generated in the excitation coil 70 exceeds a predetermined voltage threshold, if the excitation voltage is decreased by increasing the excitation current flowing through the excitation coil 70, the stator for the excitation coil 70 is reduced. Even if an induced voltage corresponding to the fluctuation is generated in the exciting coil 70 due to the fluctuation of the interlinkage magnetic flux acting on the exciting coil 70 due to the mutual inductance of each of the 14-phase stator coils 28, the induced voltage is generated. The accompanying voltage rise exceeding a certain value is offset by the voltage drop due to the increase in excitation current. Therefore, according to the control device 100 of the present embodiment, even if the linkage flux in the excitation coil 70 varies due to the influence of the mutual inductance of each phase stator coil 28, the linkage flux variation in the excitation coil 70. It is possible to suppress a voltage increase exceeding a certain value due to.

  If the voltage rise exceeding the power supply voltage of the DC power supply 104 is suppressed in the excitation coil 70, it is not necessary to increase the power supply voltage (capacity) of the DC power supply 104 to cope with the voltage rise of the excitation coil 70. For this reason, according to the present embodiment, it is possible to avoid an increase in cost due to an increase in the power supply voltage (capacity) of the DC power supply 104 necessary to distribute the excitation current to the excitation coil 70.

  In the present embodiment, the torque control unit 116 determines that the excitation current calculation unit 146 determines that the estimated excitation voltage of the excitation coil 70 exceeds a predetermined voltage threshold as described above. Almost simultaneously with the timing of increasing the excitation current to be passed through the coil 70 with respect to the reference excitation current command value Idr * using the excitation current table 136, the torque generated in the excitation-type rotating electrical machine 10 becomes equal before and after the increase. In addition, the current flowing through each phase stator coil 28 is decreased by the increase of the exciting current to the exciting coil 70 (step 110). Specifically, it is generated in the excitation-type rotating electrical machine 10 with reference to the equal torque table 150 based on the input torque command value, the increased excitation current command value Idr *, and the d-axis current command value Id *. A q-axis current command value Iq * for equalizing the torque is calculated, and the information is output to the current control unit 118 side.

  For this reason, in this embodiment, even in a situation where torque fluctuations of the excitation-type rotating electrical machine 10 can occur as the excitation current to the excitation coil 70 increases, the torque fluctuations due to a decrease in the current flowing through each phase stator coil 28. Is offset. Therefore, according to the control device 100 of the present embodiment, even when the exciting current to the exciting coil 70 is increased more than usual, by reducing the current flowing through each phase stator coil 28 at the same time, before and after the increase. The torque generated in the excitation-type rotating electrical machine 100 can be maintained at an equal torque.

  In the above embodiment, the first and second outer-diameter-side rotor cores 56 and 58 are permanently attached to the “pair of rotor cores” described in the claims. The permanent magnet non-excited magnetic poles that are not excited by the magnets 64 and 68 correspond to the “magnetic pole” recited in the claims, and the predetermined voltage threshold corresponds to the “predetermined value” recited in the claims. ing.

  In the above-described embodiment, the excitation voltage calculation unit 144 of the torque control unit 116 is based on the actual values Id and Iq of the d-axis current and the q-axis current and the actual value Idr of the current flowing in the excitation coil 70. By calculating the DC excitation voltage estimated to be generated at both ends of the excitation coil 70, the “excitation voltage detection means” described in the claims is generated in the excitation coil 70. When it is determined that the estimated value of the excitation voltage to be exceeded exceeds a predetermined voltage threshold, the excitation current flowing through the excitation coil 70 is increased from the reference excitation current command value Idr * calculated using the excitation current table 136. Accordingly, the “excitation current control means” described in the claims is configured so that the torque control unit 116 sets the excitation current table 136 based on the input torque command value and the rotation speed. The “excitation current command value calculation means” described in the claims is calculated by calculating the excitation current command value Idr * at which the loss (mainly copper loss) generated in the excitation coil 70 is minimized. When the torque control unit 116 determines that the estimated value of the excitation voltage generated in the excitation coil 70 exceeds a predetermined voltage threshold value, the torque control unit 116 causes the excitation-type rotating electrical machine 10 to perform before and after the increase of the excitation current to the excitation coil 70. The “stator coil current control means” described in the claims is formed by reducing the current passed through each phase stator coil 28 by an increase in the excitation current to the excitation coil 70 so that the generated torque becomes equal. Each is realized.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications and substitutions can be made to the above-described embodiment without departing from the scope of the present invention. .

  For example, in the above embodiment, the first outer diameter side rotor core 56 includes a permanent magnet excitation magnetic pole excited by the permanent magnet 64 and a non-excitation permanent magnet non-excitation magnetic pole that is not excited by the permanent magnet 64. And the second outer diameter side rotor core 58 has a permanent magnet excitation magnetic pole excited by the permanent magnet 68 and a non-excitation permanent magnet non-excitation magnetic pole not excited by the permanent magnet 68. Even if one outer diameter side rotor core 56 does not have a permanent magnet exciting magnetic pole excited by a permanent magnet 64 and the second outer diameter side rotor core 58 does not have a permanent magnet exciting magnetic pole excited by a permanent magnet 68. Good. In other words, a configuration that does not include the permanent magnets 64 and 68 (and a member for holding them) (that is, a configuration that is not a hybrid type) may be used.

  In the configuration of this modified example, a structure portion for holding the permanent magnets 64 and 68 may not be provided, and a region where the permanent magnets 64 and 68 were present may be formed as an air gap. Also in this modification, the torque for rotating the rotor 12 around the stator 14 can be adjusted by the magnetic flux generated by the electromagnet using the exciting coil 70, and the rotor 12 can be appropriately rotated.

  In the above embodiment, the excitation-type rotating electrical machine 10 may be composed of the three-phase stator coils 28 of U, V, and W, but may be composed of stator coils other than the three-phase.

  Further, in the above embodiment, the control device 100 has the configuration as shown in FIGS. 5 and 6, but may have other configurations.

DESCRIPTION OF SYMBOLS 10 Excitation-type rotary electric machine 12 Rotor 14 Stator 22 Air gap 24 Stator core 28 Stator coil 52 Rotor core 60 Clearance 64, 68 Permanent magnet 70 Exciting coil 100 Controller 102 Inverter 104 DC power supply 106,138 Current sensor 108 Resolver 114 Three-phase-2 phase Current conversion unit 116 Torque control unit 130 Chopper circuit 136 Excitation current table 144 Excitation voltage calculation unit 146 Excitation current calculation unit 148 Maximum torque control unit 150 Equal torque table

Claims (7)

A rotor having a pair of rotor cores arranged opposite to each other with a gap in the axial direction, with magnetic poles arranged at predetermined intervals in the circumferential direction obliquely arranged with respect to each other in the axial direction via the gap; and the rotor A control device for an excitation-type rotating electrical machine that includes a stator that is disposed opposite to the outer diameter side of the rotor and generates a rotating magnetic field that rotates the rotor, and an excitation coil that excites the magnetic poles,
Excitation voltage detection means for detecting a voltage generated in the excitation coil;
When the voltage detected by the excitation voltage detection means exceeds a predetermined value, an excitation current control means for increasing a current flowing through the excitation coil as compared with a case where the voltage does not exceed the predetermined value;
A control apparatus for an excitation-type rotating electrical machine comprising: Excitation current command value calculation means for calculating a current command value to be circulated through the excitation coil based on a torque command value to the excitation-type rotating electrical machine so as to minimize the generated loss,
The excitation current control unit is configured to calculate a current to be passed through the excitation coil when the voltage detected by the excitation voltage detection unit exceeds the predetermined value, and the current command calculated by the excitation current command value calculation unit. 2. The control device for an excitation-type rotating electrical machine according to claim 1, wherein the controller is increased with respect to the value.   The excitation current command value calculation means calculates the current command value based on the torque command value and the rotation speed of the excitation type rotating electrical machine so that the copper loss generated in the excitation coil is minimized. The control device for an excitation-type rotating electrical machine according to claim 2, wherein:   When the voltage detected by the excitation voltage detection means exceeds the predetermined value, it comprises a stator coil current control means for reducing a current flowing through the stator coil of the stator as compared with a case where the voltage does not exceed the predetermined value. The control device for an excitation-type rotating electrical machine according to any one of claims 1 to 3.   The increase of the current passed through the excitation coil by the excitation current control means and the decrease of the current passed through the stator coil of the stator by the stator coil current control means are performed within a range in which an equal torque is generated in the excitation-type rotating electrical machine. The control apparatus for an excitation-type rotating electrical machine according to claim 4, wherein:   6. The excitation voltage detection means estimates the voltage based on an actual current flowing through each phase of the excitation-type rotating electrical machine and an actual current flowing through the excitation coil. A control device for an excitation-type rotating electrical machine according to one item. The control device for an excitation-type rotating electrical machine according to any one of claims 1 to 6, wherein the predetermined value is a value based on a power supply voltage of a DC power supply that supplies electric power to the excitation-type rotating electrical machine.