Rotating electric machine control device and program

Abstract

To provide a control device for a field-winding rotary electric machine capable of shortening a period of time from starting suddenly increasing command torque of the field-winding rotary electric machine to settling torque of the rotary electric machine to the command torque.SOLUTION: A control device comprises: an operation section which operates a current flowing to a stator winding and a field current flowing to a field winding in such a manner that torque of a rotary electric machine is controlled to command torque; and a determination section which determines whether the command torque suddenly increases or not. In a period from determining the sudden increase of the command torque to settling the torque of the rotary electric machine to the command torque, the operation section makes an excitation degree of the field winding in a predetermined period after determining the sudden increase of the command torque greater than an excitation degree in a period after the predetermined period.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a control device for a rotating electrical machine. and Program Regarding. [Background technology]

[0002] Conventionally, a field-winding type rotating electric machine having a stator including a stator winding and a rotor including a field winding has been known, as described in, for example, Patent Document 1. In this rotating electric machine, the current flowing through the stator winding and the field current flowing through the field winding are manipulated to control the torque of the rotating electric machine to a command torque. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-102111 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a field winding type rotating electric machine, the command torque may suddenly increase, and in this case, there is a concern that it may take a long time from when the command torque starts to suddenly increase until the torque of the rotating electric machine converges to the command torque.

[0005] The present invention provides a control device for a field-winding type rotating electric machine that can shorten the period from when the command torque of the rotating electric machine starts to increase rapidly until the torque of the rotating electric machine converges to the command torque. and Program The main purpose is to provide. [Means for solving the problem]

[0006] The present invention provides a control device for a rotating electric machine that is applied to a system including a rotating electric machine having a stator including a stator winding and a rotor including a field winding, an operation unit that operates a current flowing through the stator winding and a field current flowing through the field winding in order to control the torque of the rotating electric machine to a command torque; a determination unit that determines whether the command torque increases rapidly; Equipped with The operating unit increases the degree of excitation of the field winding during a predetermined period from when it is determined that the command torque will rapidly increase until the torque of the rotating electric machine converges to the command torque, compared to the degree of excitation of the field winding during a period after the predetermined period.

[0007] One of the factors that causes the period from when the command torque begins to rapidly increase until the torque of the rotating electric machine converges to the command torque to be long is that the responsiveness of the field current flowing in the field winding is lower than the responsiveness of the current flowing in the stator winding.

[0008] In view of this, in the present invention, during the period from when the determination unit determines that the command torque will rapidly increase until the torque of the rotating electric machine converges to the command torque, the degree of excitation of the field winding during a predetermined period after the determination that the command torque will rapidly increase is set to be greater than the degree of excitation during a period after the predetermined period. This promotes the rise of the field current during the predetermined period, and increases the rate of increase of the torque of the rotating electric machine. As a result, the period until the torque of the rotating electric machine converges to the command torque can be shortened. [Brief description of the drawings]

[0009] [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 a state in which a conductor segment is inserted into a stator core. [Diagram 5] FIG. 4 is a front development view showing the state in which the conductor segments are assembled to the stator core. [Figure 6]FIG. 4 is a diagram showing an electrical circuit provided in the rotor. [Figure 7] FIG. 4 is a functional block diagram of torque control. [Figure 8] FIG. 4 is a diagram showing changes in fundamental current and harmonic current. [Figure 9] 6 is a flowchart showing a procedure for increasing the harmonic current amplitude when a command torque suddenly increases. [Figure 10] FIG. 4 is a diagram showing the relationship between a field weakening current, a field current, and a back electromotive voltage. [Figure 11] 5 is a time chart showing a torque follow-up effect when a command torque suddenly increases. [Figure 12] 6 is a time chart showing changes in torque etc. when a command torque suddenly increases in a comparative example; [Figure 13] FIG. [Figure 14] FIG. 4 is a cross-sectional view of a stator winding according to a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a control device according to the present invention will be described with reference to the drawings. The control device constitutes a control system for a rotating electric machine, and the control system is mounted on a vehicle. The rotating electric machine is a power source for driving the vehicle.

[0011] 1, the control system includes a DC power supply 10, an inverter 20, a control unit 30, and a rotating electric machine 40. The rotating electric machine 40 is a field winding type synchronous machine. For example, a mechanically and electrically integrated drive device may be configured by including the rotating electric machine 40, the inverter 20, and the control unit 30, or the rotating electric machine 40, the inverter 20, and the control unit 30 may each be configured by a respective component.

[0012] 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.

[0013] The stator 50 includes a stator core 51 and a stator winding 52. The stator winding 52 is made of, for example, a copper wire, and includes U-, V-, and W-phase windings 52U, 52V, and 52W that are arranged offset from each other by 120° in electrical angle.

[0014] The rotor 60 includes a rotor core 61 and a field winding 70. The field winding 70 is formed by, for example, compression molding. This improves the space factor and improves the ease of assembly of the field winding 70. The field winding 70 may be formed of, for example, an aluminum wire. The aluminum wire has a small specific gravity and can reduce the centrifugal force when the rotor 60 rotates. The aluminum wire has a lower strength and hardness than a copper wire and is suitable for compression molding. The field winding 70 is not limited to an aluminum wire, and may be, for example, a copper wire or CNT (carbon nanotube). The field winding does not have to be compression molded.

[0015] The rotating shaft 32 is inserted through a central hole of the rotor core 61. The rotating shaft 32 is rotatably supported by the housing 41 via a bearing .

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

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

[0018] Next, the stator 50 and the rotor 60 will be described with reference to FIG.

[0019] 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.

[0020] The stator 50 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.

[0021] In this embodiment, a segment coil structure using a plurality of conductor segments is adopted as the configuration of the stator 50, as shown in Fig. 4 and Fig. 5. Fig. 4 is a diagram showing a state in which the conductor segments 53 constituting the stator winding 52 are inserted into the stator core 51. Fig. 5 is a front development view showing a state in which the conductor segments 53 are assembled to the stator core 51. For ease of explanation, Fig. 5 shows only the conductor segments 53 of one of the three phases.

[0022] As shown in Fig. 4, a plurality of slots 54 are formed between adjacent teeth 51b and aligned in the circumferential direction. Each slot 54 is made up of a U-phase slot, a V-phase slot, and a W-phase slot, which are repeatedly arranged in a predetermined number (for example, two slots) in the circumferential direction. The slots 54 have an opening shape that extends in the radial direction of the stator core 51. A plurality of conductor segments 53 can be aligned in the radial direction in the slots 54.

[0023] Conductor segment 53 is generally U-shaped and has a pair of straight portions 55a and a turn portion 55b bent to connect the pair of straight portions 55a. The pair of straight portions 55a has a length greater than the axial thickness of stator core 51. Turn portion 55b has a pair of inclined portions 55c inclined at a predetermined angle with respect to the end face of stator core 51. Conductor segment 53 is made of a rectangular wire in which a conductor having a rectangular cross section is covered with an insulating film, and is formed by plastically deforming the conductor into a generally U-shape.

[0024] In the stator core 51, a plurality of conductor segments 53 are inserted into the slots 54 in a state where they are aligned in a row in the radial direction. A pair of straight portions 55a of the conductor segment 53 are arranged at different radial positions in the slots 54, with one straight portion 55a being arranged in the nth layer in the radial direction and the other straight portion 55a being arranged in the n+1th layer. In addition, the stator core 51 is provided with, for example, two slots 54A and 54B adjacent to each other in the circumferential direction and in phase, into which a pair of conductor segments 53A and 53B are inserted. In this case, the straight portions 55a of the two conductor segments 53A and 53B are inserted into the respective slots 54 spaced apart by one magnetic pole pitch while being shifted by one slot in the circumferential direction. An insulating sheet 56 is provided in the slot 54 to electrically insulate the stator core 51 and the conductor segments 53.

[0025] As shown in Fig. 5, conductor segments 53 are arranged in the circumferential direction of the stator core 51. One of the axial ends of each conductor segment 53 serves as a coil end 57A, and the other serves as a coil end 57B. Of these, the coil end 57A is formed by the turn portion 55b of the conductor segment 53. The coil end 57B is formed by joining ends of a pair of straight portions 55a of the conductor segment 53 opposite the turn portions 55b to each other, with different conductor segments 53 joining together.

[0026] More specifically, in the coil end 57B, in the conductor segment 53, the ends of a pair of straight portions 55a extending axially outward from the stator core 51 are twisted in circumferentially opposite directions so as to extend obliquely at a predetermined angle with respect to the end face of the stator core 51, forming a twisted portion 55d having a length of approximately half a magnetic pole pitch. The ends of the two twisted portions 55d of the conductor segment 53 are joined by welding to form a joint portion 55e. In the joint portion 55e, the ends of the conductor segments 53 are exposed conductor exposed portions 55f exposed from the insulating coating, and the conductor exposed portions 55f are joined to each other in a state of being overlapped. As a result, each phase winding is wave-wound around the stator core 51.

[0027] Returning to the explanation of Fig. 3, the rotor 60 is made of a soft magnetic material, for example, laminated steel plates. The rotor 60 has a cylindrical rotor core 61 and a plurality of main pole portions 62 protruding radially outward from the rotor core 61. In this embodiment, eight main pole portions 62 are provided at equal intervals in the circumferential direction.

[0028] The field winding 70 includes a first winding portion 71a and a second winding portion 71b. In each main pole portion 62, the first winding portion 71a is wound radially outward, and the second winding portion 71b is wound radially inward from the first winding portion 71a. 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 around one of the main pole portions 62 are opposite to the winding directions of the winding portions 71a and 71b wound around the other of the main pole portions 62 adjacent in the circumferential direction. Therefore, the magnetization directions of the main pole portions 62 adjacent in the circumferential direction are opposite to each other.

[0029] FIG. 6 shows an electric circuit on the rotor 60 side, which includes the windings 71a and 71b wound around a common main pole 62. The rotor 60 is provided with a diode 80 as a rectifying element and a capacitor 90. A first end of the first winding 71a is connected to the cathode of the diode 80, 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 80 is connected to the second end of the second winding 71b. A capacitor 90 is connected in parallel to the second winding 71b. In FIG. 6, L1 indicates the inductance of the first winding 71a, L2 indicates the inductance of the second winding 71b, and C indicates the capacitance of the capacitor 90.

[0030] In this embodiment, a series resonant circuit is configured from the first winding portion 71a, the capacitor 90, and the diode 80, and a parallel resonant circuit is configured from the second winding portion 71b and the capacitor 90. A first resonant frequency that is the resonant frequency of the series resonant circuit is designated as f1, and a second resonant frequency that is the resonant frequency of the parallel resonant circuit is designated as f2. The resonant frequencies f1 and f2 are expressed by the following equations (eq1) and (eq2).

[0031]

number

[0032]

number

[0033] The control unit 30 corresponds to an "operation unit" and generates drive signals for turning on and off each of the switches SUp to SWn that configure the inverter 20. In particular, the control unit 30 generates drive signals for turning on and off each of the arm 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 arm switches SUp to SWn.

[0034] The control unit 30 turns on and off each of the switches SUp to SWn so that a composite current of the fundamental current and the harmonic 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 harmonic current is a current that mainly excites the field winding 70. The phase currents flowing through the phase windings 52U, 52V, 52W are shifted by 120° in electrical angle.

[0035] Note that some or all of the functions of the control unit 30 may be configured in hardware, for example, using one or more integrated circuits, etc. Also, the functions of the control unit 30 may be configured, for example, using software recorded on a non-transient physical recording medium and a computer that executes the software.

[0036] The torque control of the rotary electric machine 40 executed by the control unit 30 will be described with reference to FIG.

[0037] The two-phase conversion unit 100 converts the U-, V-, and W-phase currents in a three-phase fixed coordinate system into a d-axis current Idr and a q-axis current Iqr in a two-phase rotating coordinate system (dq coordinate system) based on the detection value of the current sensor 21 and the electrical angle θe detected by the angle sensor 22.

[0038] The command current calculation unit 101 calculates the d-axis and q-axis command currents Id* and Iq* based on the command torque Trq*. The d-axis and q-axis command currents Id* and Iq* are values ​​reflecting the fundamental wave current and the harmonic currents exciting the field winding 70. In detail, the command current calculation unit 101 calculates the d-axis and q-axis command currents Id* and Iq* based on the command torque Trq* and map information in which the command torque Trq* and the d-axis and q-axis command currents Id* and Iq* are associated with each other. Here, the command torque Trq* is set to be larger as the accelerator operation amount detected by the accelerator sensor 24 is larger. When the rotation speed Nm of the rotor 60 increases and enters the field weakening region, the command current calculation unit 101 sets the d-axis command current Id* so that the field weakening control is executed. The current control unit 102 increases the d-axis command current Id* in the negative direction in the field weakening region. The rotation speed Nm of the rotor 60 may be calculated based on the detection value of the angle sensor 22.

[0039] The current control unit 102 calculates the d-axis current deviation ΔId by subtracting the d-axis current Idr from the d-axis command current Id*.The current control unit 102 calculates the q-axis current deviation ΔIq by subtracting the q-axis current Iqr from the q-axis command current Iq*.

[0040] The current control unit 102 calculates a d-axis command voltage Vd* based on the d-axis current deviation ΔId as a manipulated variable for feedback-controlling the d-axis current Idr to the d-axis command current Id*. The current control unit 102 calculates a q-axis command voltage Vq* based on the q-axis current deviation ΔIq as a manipulated variable for feedback-controlling the q-axis current Iqr to the q-axis command current Iq*.

[0041] A three-phase conversion unit 103 converts the d- and q-axis command voltages Vd, Vq in the two-phase rotating coordinate system into U-, V- and W-phase voltage command values ​​VU*, VV*, and VW* in the three-phase fixed coordinate system based on the d- and q-axis command voltages Vd*, Vq* and the electrical angle θe. The U-, V- and W-phase voltage command values ​​VU*, VV*, and VW* have waveforms with phases shifted by 120 degrees in electrical angle.

[0042] The frequencies of the harmonic components included in the U-, V-, and W-phase voltage command values ​​VU*, VV*, and VW* are set to a frequency close to the first resonant frequency f1 or the second resonant frequency f2. This increases the excitation and reduces the amplitude of the harmonic current, thereby reducing the torque ripple of the rotating electric machine 40.

[0043] As shown in Figure 8, the envelope of the harmonic current has half the period of the fundamental current. The envelope is shown by a dashed line in Figure 8(b). The values ​​on the vertical axis in Figure 8 indicate the relative relationship between the magnitudes of the waveforms shown in Figures 8(a) and (b). The timing at which the envelope reaches its peak value is shifted from the timing at which the fundamental current reaches its peak value. Specifically, the timing at which the envelope reaches its peak value is set to be the timing at which the fundamental current reaches its fluctuation center (0).

[0044] The timing at which the envelope of the harmonic current reaches its peak value may be, for example, the timing at which the fundamental current reaches its peak value.

[0045] Returning to the explanation of Fig. 7, the signal generating unit 104 generates drive signals for the upper and lower arm switches of the U, V, and W phases by three-phase modulation based on the U-, V-, and W-phase voltage command values ​​VU*, VV*, and VW* and the voltage Vdc of the DC power supply 10 detected by the voltage sensor 23. The generated drive signals are input to the gates of the respective switches. As a result, the switching operation of the inverter 20 is performed.

[0046] When the control unit 30 determines that the command torque Trq* will rapidly increase, the control unit 30 performs a process of increasing the degree of excitation of the field winding 70 in a predetermined period from when it is determined that the command torque Trq* will rapidly increase during a transition period from when it is determined that the command torque Trq* will rapidly increase until the torque of the rotating electric machine 40 converges to the command torque Trq*, to a degree of excitation in a period after the predetermined period during the transition period. This process is for shortening the period until the torque of the rotating electric machine 40 converges to the command torque Trq*. The procedure of this process is shown in FIG. 9.

[0047] In step S10, it is determined whether the command torque Trq* has suddenly increased. For example, if it is determined that the increase in the accelerator operation amount detected by the accelerator sensor 24 has exceeded a first predetermined amount ΔAcc, it may be determined that the command torque Trq* has suddenly increased. Also, for example, if it is determined that the increase in the acquired command torque Trq* has exceeded a second predetermined amount ΔTrq, it may be determined that the command torque Trq* has suddenly increased. The process of step S10 corresponds to a "determination unit."

[0048] If the result of the judgment in step S10 is negative, the command current calculation unit 101 calculates the d- and q-axis command currents Id* and Iq* based on the command torque Trq* and map information in which the command torque Trq* and the d- and q-axis command currents Id* and Iq* are correlated.

[0049] On the other hand, if it is determined in step S10 that there has been a sudden increase, the process proceeds to step S11, where it is determined whether the rotation speed Nm of the rotor 60 is equal to or higher than a predetermined rotation speed (for example, 6000 rpm). The process of step S11 is a process for determining whether or not it is in a situation where field-weakening control should be performed.

[0050] If it is determined in step S11 that the rotation speed Nm is less than the predetermined rotation speed, the process proceeds to step S12. In step S12, at least one of the d-axis and q-axis command currents Id* and Iq* in the command current calculation unit 101 is changed so that a harmonic current having an increased amplitude flows through the stator winding 52 compared to the amplitude of the harmonic current determined from the d-axis and q-axis command currents Id* and Iq* based on the command torque Trq* and the map information. This increases the amplitude of the harmonic current flowing through the stator winding 52, and the degree of excitation of the field winding 70 becomes greater than the degree of excitation of the field winding 70 determined based on the current command torque Trq* and the map information.

[0051] In step S13, it is determined whether or not an increase stop condition for returning the amplitude of the harmonic current to the amplitude of the harmonic current determined based on the command torque Trq* and the map information is satisfied.

[0052] For example, when it is determined that the current field current has become the field current expected when a harmonic current determined based on the current command torque Trq* and map information flows, it may be determined that the increase stop condition is satisfied. In this case, the current field current may be an estimated value or a detected value. When an estimated value is used, the estimated value may be calculated based on, for example, a voltage (back electromotive voltage) detected by the voltage sensor 23.

[0053] Also, for example, the time elapsed since the positive determination in step S10 may be counted, and it may be determined that the increase stop condition is satisfied when it is determined that the counted elapsed time has reached a determination value. The determination value is a value for determining that the current field current has become the above-mentioned assumed field current.

[0054] If it is determined in step S13 that the increase stop condition is met, the process proceeds to step S14, where the settings are returned to the command torque Trq* and the d- and q-axis command currents Id* and Iq* based on the map information.

[0055] On the other hand, if it is determined in step S11 that the rotation speed Nm of the rotor 60 is equal to or higher than the predetermined rotation speed, it is determined that a situation exists in which field-weakening control should be performed, and the process proceeds to step S15. In step S15, the current control unit 102 calculates a d-axis command current Id*(<0) so that a field-weakening current flows through the stator winding 52.

[0056] In step S16, at least one of the d- and q-axis command currents Id* and Iq* is changed so that the amplitude of the harmonic current in step S12 is increased as the magnitude of the calculated d-axis command current Id* (i.e., the field weakening current) increases.

[0057] As shown in Fig. 10, the larger the field weakening current, the larger the field current can be. If the field weakening current is large, the back electromotive voltage generated in the stator winding 52 will be lower even if the field current is made large. In other words, the larger the field weakening current, the lower the back electromotive voltage, and the greater the voltage margin of the DC power supply 10 against the back electromotive voltage. For this reason, the larger the field weakening current, the larger the amplitude of the harmonic current is, and the greater the degree of excitation of the field winding 70 is.

[0058] An example of the process of increasing the amplitude of harmonic currents is shown in Fig. 11. Fig. 11(a) shows the transition of the torque of the rotating electric machine 40. Fig. 11(b) shows the transition of the actual fundamental current and harmonic current for one phase applied to the stator winding 52. Fig. 11(c) shows the transition of the combined current of the actual fundamental current and harmonic current for three phases applied to the stator winding 52, and the transition of the field current flowing through the field winding 70.

[0059] At a timing before time t1, the control unit 30 determines that the command torque Trq* has increased sharply, and therefore the control unit 30 increases the amplitude of the harmonic current.

[0060] At time t1, the control unit 30 determines that the increase stop condition is satisfied. Therefore, the control unit 30 returns the amplitude of the harmonic current to an amplitude determined based on the current command torque Trq* and the map information. As a result, as shown in FIG. 11(b), the effective value of the harmonic current after time t1 becomes smaller than the effective value of the harmonic current before time t1. Thereafter, at time t2, the torque of the rotating electric machine 40 (for example, the time average value of the torque) converges to the command torque Trq*.

[0061] An example according to a comparative example is shown in Fig. 12. The comparative example is configured to maintain the amplitude of the harmonic current at an amplitude determined based on the current command torque Trq* and map information before and after a sudden increase in the command torque Trq*.

[0062] In the comparative example, the amplitude of the harmonic current is not temporarily increased. Therefore, the field current at the timing immediately before time t1 is smaller than the field current of this embodiment at the timing immediately before time t1 shown in Fig. 11. As a result, the timing (t3) at which the torque of the rotating electric machine 40 converges to the command torque Trq* is significantly delayed from the convergence timing (t2) of this embodiment.

[0063] As described above, according to this embodiment, it is possible to increase the degree of excitation of the field winding 70 after a sudden increase in the command torque Trq*, and thus to increase the rate of increase in the amount of magnetic flux in the rotor 60. This makes it possible to increase the rate of increase in the torque of the rotating electric machine 40, and to shorten the period until the torque of the rotating electric machine 40 converges to the command torque Trq*.

[0064] In this embodiment, conductor segments 53 as shown in Fig. 3 and Fig. 4 are used. The cross-sectional shape of the straight portion 55a of the conductor segment 53 is symmetrical with respect to the central axis of the slot 54. Therefore, as shown in Fig. 13, the magnetomotive force distribution at each pole becomes close to a sine wave, and when the rotor 60 is excited from the stator 50 side, uniform excitation can be performed on the field poles, and the degree of excitation of the field winding 70 can be effectively increased. Fig. 13 shows the transition of the magnetomotive force distribution of each phase for two magnetic poles when the electrical angle advances by 30 degrees. In Fig. 13, the maximum value of the magnetomotive force is normalized to 1.

[0065] In addition, since the magnetomotive force distribution is close to a sine wave, when the field poles of the rotor 60 are excited from the stator 50 side, even if the relative position of the field winding 70 with respect to the main pole portion 62 is slightly shifted, the decrease in the degree of excitation of the field winding 70 is small. Therefore, the phase setting of the harmonic current with respect to the fundamental current can be made redundant.

[0066] In contrast, in the case of an inserter winding using a round wire as shown in Figure 14, the symmetry of the distribution of the round wire with respect to the central axis of the slot is lost. As a result, the magnetomotive force distribution is distorted from a sine wave, and the degree of excitation is greatly reduced.

[0067] <Other embodiments> The above embodiment may be modified as follows.

[0068] In the above embodiment, the amplitude of the harmonic current is changed in two steps, but this is not limiting, and it may be changed in three or more steps so that the amplitude (envelope) decreases. Furthermore, the amplitude is not limited to being changed in steps, and the amplitude may be gradually decreased during the period from when it is determined that the command torque Trq* is rapidly increasing until the torque of the rotating electric machine 40 converges to the command torque Trq*.

[0069] The second winding portion 71b may be disposed closer to the stator 50 in the radial direction than the first winding portion 71a.

[0070] The capacitor 90 constituting the resonant circuit may be connected in parallel to the first winding portion 71a instead of the second winding portion 71b. Also, in the resonant circuit, in the series connection of the first and second winding portions 71a, 71b, the anode of the diode 80 may be connected to the first winding portion 71a side, and the cathode of the diode 80 may be connected to the second winding portion 71b side.

[0071] The rotating electric machine is not limited to an inner rotor type rotating electric machine, but may be an outer rotor type rotating electric machine. In this case, the main pole portion protrudes radially inward from the rotor core.

[0072] The rotating electric machine is not limited to a star-connected rotating electric machine, but may be a delta-connected rotating electric machine.

[0073] The stator core may not be provided with teeth.

[0074] The configuration for passing the field current through the field winding is not limited to the circuit shown in FIG. 6, and may include, for example, a configuration including a brush electrically connected to the field winding and a power source electrically connected to the brush. In this case, the control unit controls the output voltage of the power source electrically connected to the brush to a first voltage during the period from when it is determined in step S10 of FIG. 9 that the increase will increase rapidly until it is determined in step S13 that the increase stop condition is satisfied, and controls the output voltage of the power source after it is determined that the increase stop condition is satisfied to a second voltage lower than the first voltage. This allows the degree of excitation of the field winding during the output period of the first voltage to be greater than the degree of excitation of the field winding during the output period of the second voltage. When a brush is used, it is not necessary to pass a harmonic current to the stator winding to induce a field current.

[0075] 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.

[0076] The moving body on which the control system is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. Furthermore, the control system is not limited to a system mounted on a moving body, but may be a stationary system.

[0077] The control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor and a memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described in the present disclosure may be realized by one or more special-purpose computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by the computer. [Explanation of symbols]

[0078] 30...control unit, 40...rotating electric machine, 50...stator, 52...stator winding, 60...rotor, 70...field winding.

Claims

1. A control device (30) for a rotating electric machine applied to a system including a rotating electric machine (40) having a stator (50) including a stator winding (52) and a rotor (60) including a field winding (70), The system includes an inverter (20) electrically connected to the stator windings; The rotor has a rotor core (61) and main pole portions (62) provided at predetermined intervals in the circumferential direction and protruding in the radial direction from the rotor core, The field winding has a series connection of a first winding portion (71a) and a second winding portion (71b), The first winding portion and the second winding portion are wound around each of the main pole portions, The rotor is A diode (80); a capacitor (90) connected in parallel to either the first winding portion or the second winding portion; having One end of the diode is connected to the first winding portion side of both ends of the series connection body, and the other end of the diode is connected to the second winding portion side of the series connection body, an operation unit that operates a current flowing through the stator winding and a field current flowing through the field winding in order to control the torque of the rotating electric machine to a command torque; a determination unit that determines whether the command torque increases rapidly; Equipped with The operation unit includes: performing a switching operation of the inverter so as to cause a fundamental current corresponding to the command torque to flow through the stator winding, and to cause a harmonic current corresponding to the command torque to flow through the stator winding, the harmonic current being for inducing the field current in the field winding; A control device for a rotating electric machine, which makes the amplitude of the harmonic current in a predetermined period from when it is determined that the command torque will suddenly increase until the torque of the rotating electric machine converges to the command torque larger than the amplitude of the harmonic current in a period after the predetermined period, thereby making the degree of excitation of the field winding in the predetermined period larger than the degree of excitation of the field winding in a period after the predetermined period.

2. 2 . The control device for a rotating electric machine according to claim 1 , wherein the operation unit performs a switching operation of the inverter so as to cause a field weakening current to flow through the stator winding when a rotation speed of the rotor is equal to or higher than a predetermined rotation speed.

3. 3 . The control device for a rotating electric machine according to claim 2 , wherein the operation unit increases the amplitude of the harmonic current as the field weakening current increases when the rotation speed of the rotor is equal to or higher than the predetermined rotation speed.

4. The stator includes: A circular stator core (51a), teeth (51b) protruding from the stator core toward the rotor in a radial direction, A slot (54) is formed between the teeth adjacent in the circumferential direction, The stator winding is a rectangular wire having a rectangular cross-sectional shape, 4. The control device for a rotating electric machine according to claim 1, wherein in each of the slots, the rectangular wires are aligned in a row in the radial direction.

5. A program applied to a system including a rotating electric machine (40) having a stator (50) including a stator winding (52) and a rotor (60) including a field winding (70), The system includes an inverter (20) electrically connected to the stator windings; The rotor has a rotor core (61) and main pole portions (62) provided at predetermined intervals in the circumferential direction and protruding in the radial direction from the rotor core, The field winding has a series connection of a first winding portion (71a) and a second winding portion (71b), The first winding portion and the second winding portion are wound around each of the main pole portions, The rotor is A diode (80); a capacitor (90) connected in parallel to either the first winding portion or the second winding portion; having One end of the diode is connected to the first winding portion side of both ends of the series connection body, and the other end of the diode is connected to the second winding portion side of the series connection body, On the computer, an operation process for operating a current flowing through the stator winding and a field current flowing through the field winding in order to control a torque of the rotating electric machine to a command torque; A process of determining whether the command torque increases rapidly; Run the command, In the operation process, performing a switching operation of the inverter so as to cause a fundamental current corresponding to the command torque to flow through the stator winding, and to cause a harmonic current corresponding to the command torque to flow through the stator winding, the harmonic current being for inducing the field current in the field winding; a program for increasing the amplitude of the harmonic current in a predetermined period from when it is determined that the command torque will rapidly increase until the torque of the rotating electric machine converges to the command torque, to make the degree of excitation of the field winding in the predetermined period greater than the degree of excitation of the field winding in a period after the predetermined period by making the amplitude of the harmonic current in a predetermined period from when it is determined that the command torque will rapidly increase until the torque of the rotating electric machine converges to the command torque, greater than the amplitude of the harmonic current in a period after the predetermined period.

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