JP2006033956A - Controller of motor driving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of a motor driving system using a plurality of power supplies, reducing loss, size and cost, and controlling power supplied from the power supplies as an arbitrary value. <P>SOLUTION: The controller 40 of the motor driving system comprises a multiple output DC power supply 10 for outputting three or more potentials, and a power converter 30 for converting an output voltage from the multiple output DC power supply, applying the converted voltage to a motor and driving the motor. Further it is provided with a voltage instruction generating means 45 for generating a first voltage instruction value applied to the motor, and a voltage distributing means 44 for generating a second voltage instruction value group corresponding to the output potentials of the multiple output DC power supply from the first voltage instruction value outputted from the voltage instruction generating means in response to a power distribution target of power supplied from an output terminal at each potential of the multiple output DC power supply. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor drive system control device, and more specifically, a multi-output DC power supply that outputs three or more potentials, and a voltage obtained by converting the output voltage of the multi-output DC power supply is applied to a motor. It is related with the control apparatus of the motor drive system comprised by the power converter device which drives this motor by doing.

As a conventional technique, a configuration for driving a motor with high efficiency and high response using a fuel cell as a main power source is disclosed in Japanese Patent Application Laid-Open No. 2002-118981 (see Patent Document 1). In this example, as shown in FIG. 1, a capacitor is connected in parallel with a fuel cell via a DC-DC converter, and the output efficiency as a power source is controlled by controlling the output voltage of the DC-DC converter. It aims to improve.
JP 2002-118981 (paragraphs 0004-0006, FIG. 1)

However, this prior art has the following problems because the fuel cell and the battery are connected in parallel using a DC-DC converter.
-Since a DC-DC converter is used, the size of the system increases and the cost is high.
・ Battery voltage is converted by a DC-DC converter, then further converted by an inverter and applied to the motor, resulting in a large loss.
In view of the above points, the present invention can control the power supplied from each power source to an arbitrary value while making the motor drive system using a plurality of power sources lower loss, smaller in size, and lower in cost. An object of the present invention is to provide a control device for a motor drive system.

In order to solve the above-described problems, a control device for a motor drive system according to the first invention provides:
A motor drive system comprising: a multi-output DC power source that outputs three or more potentials; and a power converter that drives the motor by applying a voltage obtained by converting the output voltage of the multi-output DC power source to the motor. A control device,
Voltage command generating means for generating a first voltage command value to be applied to the motor;
According to the distributed power target value of the power to be supplied from the output terminal of each potential of the multi-output DC power supply, from the first voltage command value output from the voltage command generation means, the multi-output DC power supply Voltage distribution means for generating a second voltage command value group ((number of potentials −1) × voltage command value of the number of phases of the motor) corresponding to each output potential;
It is characterized by providing.

The control device for the motor drive system according to the second invention is:
The voltage distribution unit generates the second voltage command value group so that a sum of voltage vectors constituting the second voltage command value group is equal to a voltage vector of the first voltage command value. It is characterized by.

The control device for the motor drive system according to the third invention is:
The voltage distribution means is configured to output the second voltage command value so that the ratio of the magnitudes of the voltage vectors constituting the second voltage command value group is equal to the ratio of the corresponding power distribution target value. A group is generated.

A control device for a motor drive system according to the fourth invention is:
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command value calculating means determines a d-axis current command value and a q-axis current command value according to at least the distributed power target value;
It is characterized by that. That is, the field weakening is performed according to the “distributed power target value”.

The control device for the motor drive system according to the fifth invention is:
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command calculation means determines the d-axis current command value and the q-axis current command value according to at least the distributed power target value whose absolute value is maximum.
It is characterized by that. That is, the field weakening is performed according to the maximum “distributed power target value”.

The control device for the motor drive system according to the sixth invention is:
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command calculation means is configured to output the d-axis current command value and the q-axis current command according to a maximum absolute value of a value obtained by dividing the distributed power target value by a corresponding output potential voltage of the multi-output DC power source. Determine the value,
It is characterized by that. That is, the field weakening is performed in accordance with the maximum “distributed power target value / DC voltage”.

The control device for the motor drive system according to the seventh invention is:
The multi-output DC power source is characterized in that a low potential side or a high potential side is connected to form a common potential to form a plurality of potentials.

A control device for a motor drive system according to the eighth invention is:
The number of output potentials of the multi-output DC power supply is three.

  According to the first aspect of the invention, since the command value of the voltage generated from the voltage of each power supply is generated according to the distributed power target value, the power corresponding to the distributed power target value is supplied from each power supply. Thereby, the electric power supplied from each power supply can be controlled to a desired value without changing the voltage applied to the motor.

  According to the second invention, the voltage generated from the plurality of power sources is controlled by controlling the sum of the voltage vectors constituting the second voltage command value group to be equal to the voltage vector of the first voltage command value. Since the voltage applied to the motor driven at is the same as the first voltage command value, the motor output does not change even if the distributed power is changed.

  According to the third aspect of the invention, the ratio of the magnitudes of the voltage vectors constituting the second voltage command value group is controlled to be equal to the ratio of the corresponding power distribution target value. Each power supplied from the power source can be matched with the power distribution target value.

  According to the fourth aspect of the invention, by calculating the command value of the d-axis current and the command value of the q-axis current necessary for causing the motor to follow the torque command, at least according to the distributed power target value, The voltage command value generated from the power source can be prevented from being saturated.

  According to the fifth invention, the voltage generated from one power source is determined by determining the d-axis current command value and the q-axis current command value according to at least the distributed power target value whose absolute value is the maximum. Therefore, saturation of the voltage command value can be easily prevented.

  According to the sixth invention, the d-axis current command value and the q-axis current command value are determined according to the maximum absolute value of the value obtained by dividing the distributed power target value by the corresponding output potential voltage of the multi-output DC power supply. By doing so, it is possible to prevent the voltage command value from being saturated even when the power supply voltages are all different.

  According to the seventh aspect of the present invention, the multi-output DC power supply in which the low potential sides or the high potential sides are connected to form a common potential and a plurality of potentials are formed has a simple configuration. Small size and low cost can be achieved.

  According to the eighth aspect of the invention, the multi-output DC power supply having three output potentials has the power supply configuration having the smallest number of output potentials, thereby realizing a reduction in size and cost of the motor drive system. A great effect is obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First Embodiment FIG. 2 is a functional block diagram showing the configuration of a control device for a motor drive system according to a first embodiment of the present invention. For comparison, FIG. 3 shows a functional block diagram showing the configuration of a motor drive system using a general inverter control device.
The motor drive system according to this embodiment includes a multi-output DC power supply 10 including a DC power supply 10a and a DC power supply 10b, a power converter 30 that generates a voltage to be applied to the motor using the voltage of the power supply, The motor 20 and the power converter 30 are driven to control the torque of the motor 20, and the controller 40 controls the distribution ratio of power supplied from each of the DC voltage sources 10a and 10b.
In the multi-output DC power source 10, a low potential side terminal of the DC voltage source 10a and a low potential side terminal of 10b are connected to form a common potential (hereinafter referred to as GND potential). This power source is a power source that outputs three potentials, that is, the GND potential, the potential Vdc_a of the DC voltage source 10a, and the potential Vdc_b of the DC voltage source 10b.
The motor 20 is a three-phase AC motor. This motor is driven by an AC voltage output from a power converter 30 described below.

The power converter 30 is a DC-AC power converter that generates a voltage to be applied to the motor based on three potential voltages output from the multi-output DC power supply 10.
As shown in FIG. 4, this power converter is composed of switch means having the same configuration for each phase. A description will be given using the U-phase switch means 31. The switch 31 is a switch that generates a voltage to be output to the U phase of the motor 20, and is a first switch that can switch bidirectional conduction including a power element such as an IGBT connected to the high potential side (Vdc_a). A second switch that can switch bidirectional conduction composed of a power element such as an IGBT connected to the intermediate potential (Vdc_b), and bidirectional switching connected to the GND potential. It is comprised with the 3rd switch which can do. The third switch is a diode that conducts current flowing from the power source to the motor. It is a switch that is alternatively connected from among the GND potential, Vdc_a, and Vdc_b, and supplies the necessary voltage to the motor by changing the proportion of time to connect to each potential. The same applies to the V-phase switch means 32 and the W-phase switch means 33.
Incidentally, in the prior art of FIG. 3, an inverter 30 ′ is used as a power converter, and the components denoted by the same reference numerals have the same functions as the apparatus of the present invention except for the following. That is, the conventional standardized voltage command means 45 ′ and the conventional PWM pulse generation means 46 ′ are different from those of the present invention.

  Returning to FIG. 2, the detailed configuration of the control device 40 will be described. As shown in the figure, reference numeral 41 denotes a torque control means for calculating a command value id * of the motor d-axis current and a command value iq * of the q-axis current from a torque command given from the outside and the rotational speed of the motor. . Reference numeral 42 denotes current control means for calculating voltage command values vd * and vq * for matching the dq axis current command values id * and iq * with the dq axis current values id and iq. id and iq are obtained from the three-phase currents iu and iv by the three-phase / dq conversion means 47. Reference numeral 43 denotes dq / 3-phase voltage conversion means for converting dq-axis voltage command values vd * and vq * into three-phase voltage commands vu *, vv * and vw *. Reference numerals 44 and 45 are the central parts of the present invention. 44, U-phase voltage commands vu_a * and vu_b * generated from the voltages of the respective power supplies according to the distribution target values of the power Pa supplied from the power supply 10a and the power Pb supplied from the power supply 10b. , V-phase voltage commands vv_a *, vv_b *, W-phase voltage commands vw_a *, vw_b * are generated by voltage distribution means (hereinafter, a voltage command generated from the power supply 10a is referred to as “power supply a voltage command”, power supply 10b The voltage command generated from the power source is referred to as “power source b voltage dividing command”). 45 receives the voltage Vdc_a of the power supply 10a and the voltage Vdc_b of the power supply 10b, and standardizes the voltage commands mu_a *, mu_b *, mv_a *, vu_a *, vu_b *, vv_a *, vv_b *, vw_a *, vw_b *, Normalized voltage command generation means for generating mv_b *, mw_a *, and mw_b *. 46 is PWM pulse generation means for generating PWM pulses for turning on / off each switch of the power converter 3 based on the standardized voltage command.

Next, the operation will be described. The greatest feature of the present invention is only a power converter having a simple configuration as shown in FIG. 4, and the ratio of the power supplied from the two power sources is freely changed according to the command value while controlling the torque of the motor. There is something you can do.
In FIG. 2, the voltage distribution means 44 and the standardized voltage command generation means 45 realize the function of controlling the power distribution to a desired value. The power distribution means 44 performs calculations based on the following principle. In order to change the ratio of the electric power Pa supplied from the power source 10a and the electric power Pb supplied from the power source 10b while controlling the motor torque according to the command value, the following two conditions may be satisfied. FIG. 7 shows the power converter of the present invention, the power source, and the power flow (Pa, Pb).
1) Voltage condition Vu * = Vu_a * + Vu_b *
Vv * = Vv_a * + Vv_b *
Vw * = Vw_a * + Vw_b *
2) Power condition Pa: Pb = Vu_a *: Vu_b *
Pa: Pb = Vv_a *: Vv_b *
Pa: Pb = Vw_a *: Vw_b *

FIGS. 8 and 10 show the U-phase voltage command Vu *, the power supply a divided voltage command Vu_a *, and the power supply b divided voltage command Vu_b *. FIG. 8 shows a case where Pa and Pb have the same sign, and FIG. 10 shows a case where they have different signs. When these two conditions are represented by voltage vectors, the following is obtained.
1) Voltage condition V * = Va * (Vu_a *, Vv_a *, Vw_a *) + Vb * (Vu_b *, Vv_b *, Vw_b *)
2) Power condition Pa: Pb = sgn (Va *) | Va * (Vu_a *, Vv_a *, Vw_a *) |
: Sgn (Vb *) (| Vb * (Vu_b *, Vv_b *, Vw_b *) |
However, sgn (Va *) and sgn (Vb *) define the same direction as the voltage vector V as 1 and the opposite direction as -1.
When this is expressed by a voltage vector, it becomes as shown in FIGS.

Now, returning to FIG. 2, the operation of the voltage distribution means 44 will be described. If the sum of the power supplied from the two power sources is P, P = Pa + Pb.
here,
Pa = rto_pa · P
Pb = rto_pb · P
It is defined as However, rto_pa + rto_pb = 1.
Voltage command vu *, vv *, vw * and distributed power command value rto_pa * (= 1−rto_pb) are input to the voltage distribution means 44. From these, the power supply a divided voltage command and the power supply b divided voltage command are obtained by the following calculation.
vu_a * = rto_pa ・ vu *
vu_b * = rto_pb ・ vu *
vv_a * = rto_pa ・ vv *
vv_b * = rto_pb ・ vv *
vw_a * = rto_pa ・ vw *
vw_b * = rto_pb ・ vu *

Next, the standardized voltage command generation means 45 performs the following calculation.
mu_a * = vu_a * / Vdc_a / 2
mu_b * = vu_b * / Vdc_b / 2
mv_a * = vv_a * / Vdc_a / 2
mv_b * = vv_b * / Vdc_b / 2
mw_a * = vw_a * / Vdc_a / 2
mw_b * = vw_b * / Vdc_b / 2
With the above calculation, the power distribution of the power supply 10a and the power supply 10b can be made to follow the command value while making the motor torque follow the torque command value.

FIG. 12 shows a simulation result when the motor is driven by this control apparatus. Simulation results when the motor is driven at a constant torque and constant rotation and the distributed power command value rto_pa * of the power supply 10a is gradually increased from 0 (when the distributed power command value rto_pb * of the power supply 10b is gradually decreased from 1). is there. First, regarding the motor torque, since the dq-axis current matches the dq-axis current command value, it can be seen that the torque follows the command value even when the power is changed. Next, regarding power distribution control, it can be confirmed that the power supply a supply power Pa gradually increases and the power supply b supply power Pb gradually decreases according to the distribution power command value. From time 0 to time t1, Pa and Pb are the power of the same sign. This state is a state where the power supplied to the motor is shared between the power supply 10a and the power supply 10b. After time t1, Pa is a positive command value and Pb is a negative command value, but also follows the command value. This state is a state in which power exceeding the motor output is supplied from the power source 10a and the rest is regenerated (i.e., charged) to the power source 10b.
As described above, in this embodiment, the ratio of the power supplied from the power supply 10a and the power supply 10b can be controlled according to the command value while controlling the motor torque to the value according to the torque command.

Second Embodiment FIG. 16 is a functional block diagram showing the configuration of a control device for a motor drive system according to a second embodiment of the present invention. This embodiment is different from the first embodiment in the torque control means 41a. The other parts are the same as in the first embodiment. The torque control unit 41a newly generates a d-axis current command and a q-axis current command using the distribution power target value in addition to the torque command and the motor rotation speed. In this means, the power command a voltage command vu_a *, vv_a *, vw_a *, and the power supply b voltage command vu_b *, vv_b, vw_b * are current commands that are not higher than the power supply voltage and cannot be output. Is generated.

  FIG. 13 is a diagram illustrating the necessity of a field weakening unique to the power converter, and the operation will be described using this field. Consider a case where a power supply a divided voltage command va * and a power supply b divided voltage command vb * as shown in the figure are generated from the u-phase voltage command vu *. In this case, since the u-phase voltage command vu_a * for the power source a is larger than the voltage Vdc_a of the power source a, it is impossible to output such a voltage, resulting in a voltage shortage situation as illustrated. Therefore, it is necessary to prevent such a voltage command from being generated.

Therefore, in the torque control means 41a of the present invention, the voltage is saturated by generating a current command in which neither the power source a voltage command or the power source b voltage command is greater than the corresponding power voltage. To prevent that.
Specifically, the following operation is performed. That is, the absolute values | rto_pa * / Vdc_a | and | rto_pb * / Vdc_b | of the values obtained by dividing the distributed power command rto_pa * of the power supply 10a and the distributed power command rto_pb * of the power supply 10b by the corresponding voltages are calculated and their values are calculated. The d-axis current and the q-axis current are calculated based on the larger value. As this value is larger, the voltage becomes insufficient first. Therefore, if the d-axis current command and the q-axis current command are determined based on the larger value, neither voltage is saturated. Become. FIG. 14 is a diagram showing that the voltage shortage is resolved by performing the field weakening operation of the present invention.

  The configuration of the torque control means 41a in FIG. 16 is shown as a control block in FIG. As shown in the figure, using the d-axis current map and the q-axis current map, the distributed power commands rto_pa, rto_pb, the voltage Vdc_a of the power supply 10a, and the voltage Vdc_b of the power supply 10b are input, and max (| rto_pa * / Vdc_a | , | Rto_pb * / Vdc_b |) and the torque command and the motor rotation speed, the d-axis current command id * and the q-axis current command iq * are calculated.

Third Embodiment FIG. 17 is a functional block diagram showing the configuration of a control system for a fuel cell vehicle according to a third embodiment of the present invention. That is, this is an example in which the motor drive control system according to the present invention is applied to a fuel cell vehicle. The fuel cell (FC) should not use regenerative power, change its efficiency depending on the operating point, or have poor responsiveness, etc., so the fuel cell and battery power should be used in an appropriate distribution. It is said that. In this embodiment, as described in the first embodiment, electric power according to a distributed power target value given from the outside can be supplied from the fuel cell and the battery. Therefore, when an optimal power distribution command is given from the viewpoint of efficiency, the motor can be driven with high efficiency, and in the case of regeneration, the power distribution command is set so that all power (100%) returns to the battery. Then, it is possible to perform power distribution according to the situation, such as regenerating all the power in the battery. In addition, the power distribution command given from the outside can be calculated in this control system. At that time, the power distribution command is a rapid driver acceleration in the configuration in which the fuel cell and the battery are combined as in this embodiment. If there is a shortage of acceleration due to demand, etc., the distribution of “relatively poorly responsive fuel cells” will be reduced, and the distribution of “highly responsive batteries” will be increased to meet driver acceleration demands, thus eliminating the shortage of acceleration. Accordingly, it is preferable to perform control so as to return each to distribution by normal calculation. This is effective not only in the fuel cell but also in the control of changing the distribution in this way because of the superiority or inferiority of the response of the power source (battery, capacitor, etc.).
In this embodiment, the direct conversion of the voltage by the semiconductor switch is performed, so that significant reduction in size and loss can be achieved as compared with the conventional example using the DC-DC converter (FIG. 1). In the present embodiment, an automobile is illustrated, but the present control device can be similarly applied to a vehicle (train, motorcycle, etc.) other than the automobile.

Fourth Embodiment FIG. 18 is a functional block diagram showing a configuration of a vehicle control system having a dual power supply system according to a fourth embodiment of the present invention. That is, this is an example in which the motor drive control system according to the present invention is applied to a vehicle equipped with a power supply system of 42V and 14V. In this embodiment, power can be distributed to the 42V battery and the 14V battery at an arbitrary ratio, so that the charge amount of either battery can be controlled to a desired value.

Although the principle of the present invention has been described in various embodiments in the present specification, those skilled in the art can make various modifications and changes to the present invention based on the present disclosure, and these are also included in the present invention. Please note that
Therefore, as shown in FIG. 4, only an example of a power converter corresponding to a configuration in which the multi-output DC power source has a configuration in which the low potential side of the single output power source is a common potential is shown. It is not limited to the power converter. For example, a power converter corresponding to a multi-output DC power source having a configuration in which the high potential side of a single power source is set to a common potential as shown in FIG. 5, and a multi-unit having a configuration in which a single power source is connected in series as shown in FIG. A power converter corresponding to the output DC power supply may be used. 5 includes U, V, W phase switching means 31a, 32a, 33a, and the power converter 30b in FIG. 6 includes U, V, W phase switching means 31b, 32b, 33b is included. Further, the converter switches shown in FIGS. 4, 5, and 6 use one diode for each phase, but these are only examples, and all use known power elements such as IGBTs and MOSFETs. It is also possible to take other configurations.
For convenience of explanation, only three voltage levels are shown. However, even when there are four or more voltage levels, it is possible to control power distribution in the same manner. Further, the single output power source constituting the multi-output DC power source may be any known power storage means such as a capacitor.

It is a figure which shows the structure of the conventional motor control system. It is a functional block diagram which shows the structure of the control apparatus of the motor drive system by the 1st embodiment of this invention. It is a functional block diagram which shows the structure of the motor drive system using the control apparatus of a general inverter. It is a figure which shows the example of the power supply and power converter device which are used for the control system of this invention. It is a figure which shows the example of the power supply and power converter device which are used for the control system of this invention. It is a figure which shows the example of the power supply and power converter device which are used for the control system of this invention. It is a figure which shows the power converter device of this invention, a power supply, and electric power flow (Pa, Pb). It is a figure explaining voltage distribution with a phase voltage waveform (when the electric power supplied from two power supplies is the same sign). It is a figure explaining voltage distribution by a voltage vector (when the electric power supplied from two power supplies is the same sign). It is a figure explaining voltage distribution with a phase voltage waveform (when the electric power supplied from two power supplies has a different sign). It is a figure explaining voltage distribution by a voltage vector (when the electric power supplied from two power supplies has a different sign). It is a figure which shows the simulation result at the time of driving a motor with this control apparatus. It is a figure which shows the necessity of the field weakening peculiar to this power converter device. It is a figure which shows that the voltage shortage was eliminated by performing the field weakening operation of the present invention. It is a figure which shows the field-weakening block of this invention. It is a functional block diagram which shows the structure of the control apparatus of the motor drive system by the 2nd embodiment of this invention. It is a functional block diagram which shows the structure of the control system of the fuel cell vehicle by the 3rd Example aspect of this invention. It is a functional block diagram which shows the structure of the control system of the vehicle provided with 2 power supply systems by the 4th Example aspect of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Multi-output DC power supply 10a DC power supply 10b DC power supply 20 Motor 30, 30a, 30b Power converter 31, 31a, 31b U phase switch means 32, 32a, 32b V phase switch means 33, 33a, 33b W phase switch Means 40 Controller 41, 41a Torque control means 42 Current control means 43 dq / 3-phase voltage conversion means 44 Voltage distribution means 45 Normalized voltage command generation means 45 'Conventional normalization voltage command generation means 46 PWM pulse generation means 46' Conventional PWM pulse generation means 47 3-phase / dq conversion means

Claims (8)

A motor drive system comprising: a multi-output DC power source that outputs three or more potentials; and a power converter that drives the motor by applying a voltage obtained by converting the output voltage of the multi-output DC power source to the motor. A control device,
Voltage command generating means for generating a first voltage command value to be applied to the motor;
According to the distributed power target value of the power to be supplied from the output terminal of each potential of the multi-output DC power supply, from the first voltage command value output from the voltage command generation means, the multi-output DC power supply Voltage distribution means for generating a second voltage command value group corresponding to each output potential;
A motor drive system control device comprising: In the control apparatus of the motor drive system according to claim 1,
The voltage distribution unit generates the second voltage command value group so that a sum of voltage vectors constituting the second voltage command value group is equal to a voltage vector of the first voltage command value. To
A control device for a motor drive system. In the control apparatus of the motor drive system according to claim 1 or 2,
The voltage distribution means is configured to output the second voltage command value so that the ratio of the magnitudes of the voltage vectors constituting the second voltage command value group is equal to the ratio of the corresponding power distribution target value. Generate groups,
A control device for a motor drive system. In the control apparatus of the motor drive system of any one of Claims 1-3,
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command value calculating means determines a d-axis current command value and a q-axis current command value according to at least the distributed power target value;
A control device for a motor drive system. In the control apparatus of the motor drive system of any one of Claims 1-3,
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command calculation means determines the d-axis current command value and the q-axis current command value according to at least the distributed power target value whose absolute value is maximum.
A control device for a motor drive system. In the control apparatus of the motor drive system of any one of Claims 1-3,
Current command value calculating means for calculating a d-axis current command value and a q-axis current command value necessary for causing the motor to follow the torque command;
The current command calculation means is configured to output the d-axis current command value and the q-axis current command according to a maximum absolute value of a value obtained by dividing the distributed power target value by a corresponding output potential voltage of the multi-output DC power source. Determine the value,
A control device for a motor drive system. In the control apparatus of the motor drive system according to any one of claims 1 to 6,
The multi-output DC power supply is configured to form a plurality of potentials by connecting the low potential sides or the high potential sides to form a common potential.
A control device for a motor drive system. In the control apparatus of the motor drive system according to any one of claims 1 to 7,
The number of output potentials of the multi-output DC power supply is three.
A control device for a motor drive system.

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