Control device for rotating machine, drive control device for rotating machine, and drive control system for rotating machine

Abstract

To improve efficiency of drive control of a rotary machine.SOLUTION: A rotating machine control device 7 for controlling a rotating machine having a first winding 2 and a second winding 3 magnetically coupled to the first winding 2 via first and second inverters 5 and 6 connected to the first and second windings, respectively, the rotating machine control device 7 including a first controller 20 that outputs a drive signal to at least one of the first and second inverters based on an operating condition that is a combination of a rotational speed of the rotating machine and a control command, the first controller has two control modes including a first control mode in which a drive signal is output to both the first and second inverters and a second control mode in which a drive signal is output to only one of the first and second inverters, has a database in which a total loss in both the control modes is associated with each of a plurality of operation conditions, and selects a control mode in which the total loss is lower based on the database.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a control device for a rotating machine, a drive control device for a rotating machine, and a drive control system for a rotating machine. [Background technology]

[0002] In today's world, where demand for electric vehicles is increasing, there is an urgent need to develop energy-saving technologies to improve drive efficiency. In particular, there is a demand for improved drive efficiency in the low-load range, which is frequently used in situations such as city driving. In Patent Document 1 listed below, when the load detected by a load detection means is greater than a predetermined value, both of the two electric motor systems are driven in combination, and when the load is less than the predetermined value, only one system is selected and driven, thereby reducing the power consumption of the electric motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-103497

[0004] In Patent Document 1, switching between dual-system drive and single-system drive is performed based on a predetermined load. Here, motor losses mainly consist of copper loss and iron loss. For the same torque output, the copper loss in each system is greater in single-system drive than in dual-system drive. On the other hand, in single-system drive, the armature winding magnetic flux does not interlink with the teeth of the unexcited core, so carrier harmonic iron loss in single-system drive may be reduced compared to dual-system drive. Phase current ripple varies depending on factors such as mutual inductance and voltage utilization rate. Therefore, switching between single-system drive and dual-system drive based on a predetermined load without considering the rotational speed may not necessarily select the optimal drive method. Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a control device for a rotating machine, a drive control device for a rotating machine, and a drive control system for a rotating machine that achieves highly efficient operation by reducing losses, particularly in the low load region. [Means for solving the problem]

[0006] A control device for a rotating machine that controls a rotating machine having a first winding and a second winding magnetically coupled to the first winding via a first inverter connected to the first winding and a second inverter connected to the second winding, respectively, includes a first controller that outputs a drive signal to at least one of the first inverter and the second inverter based on operating conditions that are a combination of control commands related to the rotational speed of the rotating machine and the torque or power for driving the rotating machine, and the first controller has two control modes: a first control mode that outputs a drive signal to both the first inverter and the second inverter, and a second control mode that outputs a drive signal only to either the first inverter or the second inverter, and the control device has a database that associates data that can determine which of the two control modes is most efficient with each of a plurality of operating conditions, and selects the control mode that results in the smallest total loss in the rotating machine, the first inverter, and the second inverter for the operating conditions under which the rotating machine is operating, based on the database. [Effects of the Invention]

[0007] According to the rotating machine control device, rotating machine drive control device, and rotating machine drive control system of the present disclosure, it is possible to appropriately select from the first control mode and the second control mode the control mode that reduces the total loss generated in the rotating machine, the first inverter, and the second inverter based on the operating conditions, which are a combination of the rotational speed and the control command, thereby improving the efficiency of the drive control of the rotating machine. [Brief explanation of the drawings]

[0008] [Figure 1]1 is an overall configuration diagram of a drive control device 1 for a rotating machine and a drive control system for a rotating machine according to a first embodiment. [Figure 2] FIG. 2 is a block diagram of a first controller 20 according to the first embodiment. [Figure 3] 2 is a diagram showing the concept of control mode selection for realizing highly efficient operation on a two-dimensional plane of rotational speed vs. control command in the drive control device 1 of the rotating machine according to the first embodiment. FIG. [Figure 4] 4 is a diagram in which the idea of ​​hysteresis is introduced when switching control modes in selecting the control mode in FIG. 3 in the drive control device 1 for the rotating machine according to the first embodiment. FIG. [Figure 5] 4 is a diagram showing a flow of control mode selection when a control command is positive in the drive control device 1 for the rotating machine according to the first embodiment. FIG. [Figure 6] 4 is a diagram showing a flow of control mode selection when a control command is negative in the drive control device 1 for the rotating machine according to the first embodiment. FIG. [Figure 7] 5 is a diagram in which the curves that are boundaries for switching control modes shown in FIG. 4 are simplified in the drive control device 1 for the rotating machine according to the first embodiment. FIG. [Figure 8] 5 is a diagram in which the curves that are boundaries for switching control modes shown in FIG. 4 are simplified in the drive control device 1 for the rotating machine according to the first embodiment. FIG. [Figure 9] 10 is an overall configuration diagram of a drive control device 1a for a rotating machine and a drive control system for a rotating machine according to a second embodiment. FIG. [Figure 10] 10 is a circuit configuration diagram of power conversion circuits 31 and 32 according to a second embodiment. FIG. [Figure 11] FIG. 10 is a block diagram of a second controller 50 according to a second embodiment. [Figure 12] 10 is an overall configuration diagram of a drive control device 1b for a rotating machine and a drive control system for a rotating machine according to a third embodiment. FIG. [Figure 13] FIG. 10 is a block diagram of a third controller 60 according to the third embodiment. [Figure 14]10 is an overall configuration diagram of a drive control device 1c for a rotating machine and a drive control system for a rotating machine according to a fourth embodiment. FIG. [Figure 15] FIG. 10 is a block diagram of a first controller 20a according to a fourth embodiment. [Figure 16] FIG. 1 is a diagram illustrating an example of hardware of controllers 7, 7a, 7b, 7c, first controllers 20, 20a, second controller 50, and third controller 60 according to first to fourth embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments of a rotating machine control device, a rotating machine drive control device, and a rotating machine drive control system according to the present disclosure will be described with reference to the drawings. Note that the same reference numerals are used to designate the same contents and corresponding parts, and detailed descriptions thereof will be omitted.

[0010] Embodiment 1 FIG. 1 is a diagram showing the overall configuration of a rotating machine drive control system including a rotating machine drive control device 1 according to a first embodiment and a rotating machine 4. The drive control device 1 controls the drive of the rotating machine 4, which is a dual three-phase rotating machine having a first winding 2 and a second winding 3, and includes a first inverter 5, a second inverter 6, and a controller 7. The first winding 2 and the second winding 3 are magnetically coupled to each other by, for example, sharing a core. In this embodiment, current measurements from a first current sensor 8 that measures the value of the current supplied to the first winding 2 and a second current sensor 9 that measures the value of the current supplied to the second winding 3 are input to the controller 7, which corresponds to the rotating machine control device. At the same time, signals for controlling the first inverter 5 and the second inverter 6 are output from the controller 7 to each inverter.

[0011] 1, MOSFETs are used as the switching devices constituting the first inverter 5 and the second inverter 6, but other devices such as IGBTs may also be used. Similar effects can also be obtained with a multilevel inverter circuit such as a three-level inverter circuit.

[0012] The drive control device 1 is connected to DC power via a first connection terminal 10, and the first connection terminal 10 is connected to a first inverter 5 and a second inverter 6 to exchange power. The output of the first inverter 5 is connected to a first winding 2 of the rotating machine 4. A first current sensor 8 detects the current of each phase of the first winding 2 of the rotating machine 4. The output of the second inverter 6 is connected to a second winding 3 of the rotating machine 4. A second current sensor 9 detects the current of each phase of the second winding 3 of the rotating machine 4. Any method for detecting the current may be used, such as a CT, a Hall element, or a shunt resistor.

[0013] A signal line from the first current sensor 8 is connected to the controller 7, and the current value of the first winding 2 is detected. A signal line from the second current sensor 9 is also connected to the controller 7, and the current value of the second winding 3 is detected. A signal line from the controller 7 is connected to the first inverter 5, and a first gate signal is transmitted from the controller 7. A signal line from the controller 7 is also connected to the second inverter 6, and a second gate signal is transmitted from the controller 7.

[0014] During power running operation in which power flows from the first connection terminal 10 to the rotating machine 4, DC power input to the first connection terminal 10 is converted into AC power by the first inverter 5 and the second inverter 6 and supplied to the first winding 2 and the second winding 3 of the rotating machine 4, respectively. On the other hand, during regenerative operation in which power flows from the rotating machine 4 to the first connection terminal 10, AC power generated by the rotating machine 4 is converted into DC power by the first inverter 5 and the second inverter 6 and input to the first connection terminal 10.

[0015] Figure 2 is a block diagram of the first controller 20, which constitutes a part of the controller 7. The operation of the drive control device 1 when it is in operation will be described below with reference to Figure 2. Based on the rotational speed and a control command, the mode selection unit 21 selects either a first control mode in which both the first inverter 5 and the second inverter 6 are energized, or a second control mode in which the first inverter 5 is energized but the second inverter 6 is not. Here, a torque command is given as an example of a control command, but other commands such as a power command may also be used.

[0016] The current command calculation unit 22 calculates the current command for the first winding 2 and the current command for the second winding 3 based on the selected control mode. When the mode selection unit 21 selects the first control mode, the current command calculation unit 22 allocates the current command to the first winding 2 and the current command to the second winding 3. A 1:1 allocation is preferable because thermal bias can be suppressed by flowing current evenly. On the other hand, when the mode selection unit selects the second control mode, the current command calculation unit 22 sets the current command for the second winding 3 to 0 and allocates the remainder to the current command for the first winding 2. The current command value may be calculated using a table with two axes, rotation speed and control command. Alternatively, any other method may be used as long as an appropriate current command can be obtained.

[0017] The voltage command calculation unit 23 calculates a voltage command to the first inverter 5 and a voltage command to the second inverter 6 by known feedback control based on the current value of the first winding 2 detected by the first current sensor 8, the current value of the second winding 3 detected by the second current sensor 9, the current command to the first winding 2, and the current command to the second winding 3.

[0018] When the induced voltages generated in the first winding 2 and the second winding 3 have a large effect and cause poor responsiveness of the feedback control, it is advisable to use a known non-interference control. Note that optimization may be performed according to the control mode, such as by implementing non-interference control when selecting the first control mode in which current is passed through both the first winding 2 and the second winding 3, or by changing the feedback gain for each control mode.

[0019] The first gate signal generation unit 24 and the second gate signal generation unit 25 generate gate signals for the first inverter 5 and the second inverter 6 based on the voltage command for the first inverter 5 and the second inverter 6, for example, by comparing the voltage command with a triangular carrier wave and performing PWM modulation. Either synchronous PWM or asynchronous PWM may be used. The triangular carrier wave may also be changed for each rotation speed. Alternatively, the gate signals for the first inverter 5 and the second inverter 6 may be generated by space vector modulation. However, when the second control mode is selected, all gate signals for the second inverter 6 are turned off to prevent current flow.

[0020] Although the configuration has been described in which the second inverter 6 is not energized when the second control mode is selected, the inverter that is not energized may be the first inverter 5, or the first inverter 5 and the second inverter 6 may be switched.

[0021] Next, we will explain how to select the control mode. Figure 3 shows the control mode selection process for achieving highly efficient operation on a two-dimensional plane of rotational speed and control command. We will explain the reason for this later, but considering efficient operation, it is best to select the first control mode in region A (the unhatched area where the control command is greater than 0) and region C (the unhatched area where the control command is less than 0), and the second control mode in region B (the hatched area where the control command is greater than 0) and region D (the hatched area where the control command is less than 0). The curves drawn on the boundary between regions A and B and the boundary between regions C and D correspond to the operating conditions of the rotational speed and control command under which the total loss (the sum of the iron loss and copper loss in the rotating machine 4 plus the losses in the first inverter 5 and the second inverter 6) in both control modes is equal.

[0022] Copper loss is RI 2(R: winding resistance, I: current flowing through the winding) Therefore, when current commands are distributed 1:1 to the first winding 2 and the second winding 3 in the first control mode to output the same torque, the copper loss due to the fundamental wave current in the second control mode will be about twice the copper loss due to the fundamental wave current in the first control mode.

[0023] Furthermore, in the low rotation speed range where the induced voltage of the rotating machine 4 is low, harmonic components that appear in the carrier cycle also have a significant effect on copper loss. Conversely, in the high rotation speed range where the induced voltage of the rotating machine 4 is high, field-weakening control is performed to avoid a state of voltage saturation where the rotation speed of the rotating machine 4 does not increase due to the influence of the induced voltage. In field-weakening control, a current is passed so as to cancel out the magnetic flux of the magnet by armature reaction (the magnetic flux generated by the permanent magnet is canceled out by the first winding 2 and the second winding 3), so a current unnecessary for torque generation is passed. This results in an increase in copper loss.

[0024] Iron loss can be broken down into various components, such as eddy current loss, hysteresis loss, stray load loss, and carrier harmonic iron loss. This embodiment focuses on reducing carrier harmonic iron loss. The dominant factor affecting carrier harmonic iron loss is the volume of the core with which the magnetic flux of the carrier harmonic components generated by energizing the windings intersects. The larger the volume of the interlinked core, the greater the carrier harmonic iron loss. Therefore, comparing the first and second control modes, in which current is applied to each winding, the first control mode energizes both the first winding 2 and the second winding 3. Therefore, the volume of the core with which the magnetic flux interlinks is larger than in the second control mode, in which current is applied only to the first winding 2. This results in greater carrier harmonic iron loss.

[0025] Furthermore, iron loss also depends on the voltage utilization rate, which is the ratio of the voltage that the inverter can output to the input voltage and is expressed as a value between 0 and 1. Iron loss depends on the change in magnetic flux density in the iron core over time; when the voltage utilization rate is high, the change in magnetic flux density in the iron core over time is small, so iron loss also decreases. Conversely, when the voltage utilization rate is low, the change in magnetic flux density in the iron core over time is large, so iron loss also increases.

[0026] Based on the above, we consider the losses, or efficiency, of a rotating machine at operating points a to d defined on a two-dimensional plane of rotational speed and control command. First, at operating points a and c, the voltage utilization rate is small, resulting in a relatively large change in magnetic flux density in the iron core over time, resulting in large iron loss. Therefore, consideration must be given to each control mode. In the first control mode, current is passed through both the first winding 2 and the second winding 3, generating mutual inductance between the magnetically coupled windings. However, in the second control mode, current is passed only through the first winding 2, so no mutual inductance is generated. Therefore, the total inductance is higher in the first control mode than in the second control mode, since the mutual inductance is added to the self-inductance. Therefore, the carrier harmonic components contained in the phase current are more effectively suppressed in the first control mode than in the second control mode. As a result, at rotational speeds lower than N1, the first control mode enables more efficient operation.

[0027] Furthermore, at operating points a and c, the induced voltage is lower than at operating points b and d, and as a result, the voltage utilization rate is also smaller, as mentioned above. This results in larger phase current fluctuations, increasing iron loss and harmonic copper loss due to phase current fluctuations. If the second control mode is selected here, this increases copper loss while reducing carrier harmonic iron loss. However, since the increase in copper loss due to switching to the second control mode exceeds the decrease in carrier harmonic iron loss, selecting the second control mode results in greater losses overall than selecting the first control mode. For this reason, selecting the first control mode is more efficient.

[0028] Comparing powering operation (control command > 0) with regenerative operation (control command < 0), when the absolute values ​​of the output torque are the same, the voltage utilization rate is smaller during regenerative operation than during powering operation, so the range in which the second control mode is more efficient shifts to the right during regenerative operation compared to powering operation, and the first control mode can be operated more efficiently even at rotational speeds higher than rotational speed N1. As a result, when the first control mode is selected, operation is more efficient at rotational speeds lower than rotational speed N2, which is higher than rotational speed N1.

[0029] Next, at operating points b and d, whether the first or second control mode is selected, the voltage utilization rate is sufficiently high, so the magnitude of the carrier harmonic components contained in the phase current is similar in both control modes. However, because the voltage utilization rate tends to be higher when the second control mode is selected than when the first control mode is selected, the phase current amplitude required to obtain the same output torque is larger when the second control mode is selected. In other words, because the voltage utilization rate increases as the rotation speed increases, the range in which the second control mode is more efficient becomes smaller.

[0030] Furthermore, because the induced voltage becomes high at operating points b and d, field-weakening control is required to prevent voltage saturation as mentioned above, and current is passed through the motor so as to cancel out the magnetic flux of the magnet due to armature reaction, which increases copper loss due to the passage of current unnecessary for torque generation. If the second control mode is selected, copper loss increases while carrier harmonic iron loss decreases, but the increase in copper loss due to switching to the second control mode exceeds the decrease in carrier harmonic iron loss, so selecting the second control mode results in greater loss overall than selecting the first control mode. For this reason, selecting the first control mode is more efficient.

[0031] The above explanation focuses on operating points a to d, which belong to regions A and C where the first control mode is selected. However, the reason for selecting regions B and D, where the second control mode is selected, can also be explained by evaluating the values ​​of copper loss and carrier harmonic iron loss. In the second control mode, where only one system is energized, some teeth are not excited, but carrier harmonic iron loss does not occur in the unexcited teeth. On the other hand, when only one system is used, copper loss per torque increases. Based on this relationship between carrier harmonic iron loss and copper loss, there are cases where the total loss, which is the sum of the carrier harmonic iron loss and copper loss in the rotating machine 4 plus the losses in the first inverter 5 and the second inverter 6, is smaller in the second control mode at a certain operating point. This case corresponds to the hatched regions B and D in Figure 3.

[0032] In conclusion, once the rotation speed of the rotating machine 4 and control commands such as load torque are quantitatively determined, it is possible to evaluate the carrier harmonic iron loss and copper loss for the first control mode and the second control mode by modeling the rotating machine 4 as a magnetic circuit and performing electromagnetic field analysis. It is also possible to measure the carrier harmonic iron loss and copper loss by manufacturing an actual rotating machine 4 and its drive control device 1 and actually operating them in the first control mode and the second control mode.

[0033] Based on the data on the total loss for both modes obtained in this way, a graph such as that shown in Fig. 3 can be plotted. Furthermore, a database can be constructed in which the total loss for both modes or the more efficient control mode is associated with the operating conditions of rotation speed and control command, and based on this database, it can be determined whether the first control mode or the second control mode should be adopted to achieve more efficient operation in accordance with the rotation speed and control command while the rotating machine 4 is operating.

[0034] It is possible to use either a set value or a measured value for the rotational speed here, but since control is performed so that the measured value of the rotational speed is equal to the set value, there is no substantial difference between the measured value and the set value. Furthermore, while it is conceivable that a rotational speed sensor would be necessary when a measured value is used, a method of estimating the speed without measuring it and controlling a rotating machine (sensorless control) is also common, so a rotational speed sensor is not necessarily required.

[0035] Figure 4 shows the control mode selection shown in Figure 3, incorporating the concept of hysteresis when switching between control modes. When operating under conditions close to those indicated by the curves corresponding to the boundaries of control mode switching in Figure 3, frequent switching between the first and second control modes due to slight fluctuations in the rotation speed and control command can be cumbersome. Therefore, we define curves (shown by dashed lines, designated as the second and fourth thresholds) offset by a certain amount from the curves (shown by solid lines, designated as the first and third thresholds) at which the total losses in both modes are equal. Here, switching from the first control mode (outside the curve) to the second control mode (inside the curve) is performed based on the second or fourth threshold (dashed line), and conversely, switching from the second control mode (inside the curve) to the first control mode (outside the curve) is performed based on the first or third threshold (solid line).

[0036] By doing so, it is possible to prevent the control mode from switching even when the operating conditions fluctuate slightly near the curve corresponding to the control mode switching. The offset amounts between the first and second thresholds and between the third and fourth thresholds can be determined based on the degree to which the rotation speed and control command are likely to fluctuate due to disturbances, etc. On the other hand, when a high frequency of switching of the control mode is permitted, the offset amounts may be set to 0.

[0037] If the control command is positive (powering operation), a control mode is selected according to the flowchart in FIG. 5. In step S300, the rotation speed and control command are input. In step S301, it is determined whether the first control mode has been selected as the current control mode, and if Yes, the process proceeds to step S302, and if No, the process proceeds to step S303. In step S302, it is determined whether the rotation speed is smaller than N1a shown in FIG. 4, and if Yes, the process proceeds to step S310 to select the first control mode, and if No, the process proceeds to step S304. In step S304, it is determined whether the control command is smaller than a second threshold value (see FIG. 4) determined based on the rotation speed, and if Yes, the process proceeds to step S311 to select the second control mode, and if No, the process proceeds to step S312 to select the first control mode.

[0038] On the other hand, if the process proceeds from step S301 to step S303, it is determined whether the rotation speed is smaller than N1 (see FIG. 4), and if Yes, it proceeds to step S313 to select the first control mode, and if No, it proceeds to step S305. In step S305, it is determined whether the control command is smaller than a first threshold value (see FIG. 4) determined based on the rotation speed, and if Yes, it proceeds to step S314 to select the second control mode, and if No, it proceeds to step S315 to select the first control mode.

[0039] If the control command is negative (regenerative operation), a control mode is selected according to the flowchart in FIG. 6. In step S320, the rotation speed and control command are input. In step S321, it is determined whether the first control mode is selected as the current control mode. If Yes, the process proceeds to step S322. If No, the process proceeds to step S323. In step S322, it is determined whether the rotation speed is smaller than N2a shown in FIG. 4. If Yes, the process proceeds to step S330, where the first control mode is selected. If No, the process proceeds to step S324. In step S324, it is determined whether the control command is larger than a fourth threshold determined based on the rotation speed. If Yes, the process proceeds to step S331, where the second control mode is selected. If No, the process proceeds to step S332, where the first control mode is selected.

[0040] In step S323, it is determined whether the rotation speed is smaller than N2 (see FIG. 4), and if Yes, the process proceeds to step S333 where the first control mode is selected, and if No, the process proceeds to step S325. In step S325, it is determined whether the control command is greater than a third threshold determined based on the rotation speed, and if Yes, the process proceeds to step S334 where the second control mode is selected, and if No, the process proceeds to step S335 where the first control mode is selected.

[0041] While the control mode was selected using the flowcharts shown in Figures 5 and 6 above, mode selection may also be performed using a table with two axes: rotational speed and control command. As described above, the carrier harmonic iron loss and copper loss for each operating condition (rotational speed, control command) can be obtained by modeling the rotating machine 4 as a magnetic circuit and performing electromagnetic field analysis, or by fabricating an actual rotating machine 4 and its drive control device 1. Therefore, this table can be defined to correlate each operating condition with the total loss (the sum of the carrier harmonic iron loss and copper loss in the rotating machine 4 plus the losses in the first inverter 5 and the second inverter 6) in the first and second control modes, or to correlate each operating condition with the more efficient control mode, either the first or second control mode. While not described in detail here, the losses in the first inverter 5 and the second inverter 6 can also be similarly determined by performing circuit simulation or fabricating an actual machine.

[0042] Alternatively, the characteristics of FIG. 4 may be simplified to use the curves shown in FIG. 7 as the first and third thresholds. The curve relating to the first threshold is characterized in that, as the rotation speed increases, the control command monotonically increases with rotation speed in a region where the rotation speed is greater than N1 and equal to or less than N5, maintains a constant value regardless of rotation speed in a region where the rotation speed is greater than N5 and equal to or less than N3, and monotonically decreases with rotation speed in a region where the rotation speed is greater than N3. The curve relating to the third threshold is characterized in that the absolute value of the control command monotonically increases with rotation speed in a region where the rotation speed is greater than N2 and equal to or less than N6, maintains a constant value regardless of rotation speed in a region where the rotation speed is greater than N6 and equal to or less than N4, and monotonically decreases with rotation speed in a region where the rotation speed is greater than N4. By expressing the curves relating to each threshold as a shape composed of multiple straight lines in this way, mode selection between the first and second control modes is simplified, thereby reducing the processing load.

[0043] Furthermore, since disturbance factors become larger at high rotation speeds, the controllability of current control decreases compared to low rotation speeds. As shown in Fig. 8, the curve relating to the third threshold value may be characterized in that the absolute value of the control command monotonically increases with respect to the rotation speed in a region where the rotation speed is greater than N2 and equal to or less than N6, maintains a constant value regardless of the rotation speed in a region where the rotation speed is greater than N6 and equal to or less than N3, and monotonically decreases with respect to the rotation speed in a region where the rotation speed is greater than N3.

[0044] As described above, the rotating machine control device 7 according to this embodiment is a rotating machine control device 7 that controls the rotating machine 4 having the first winding 2 and the second winding 3 magnetically coupled to the first winding 2, via the first inverter 5 connected to the first winding 2 and the second inverter 6 connected to the second winding 3, and includes a first controller 20 that outputs a drive signal to at least one of the first inverter 5 and the second inverter 6 based on operating conditions that are a combination of control commands related to the rotation speed of the rotating machine 4 and the torque or power for driving the rotating machine 4. The first controller 20 controls the first inverter 5 and the second inverter 6. The control system has two control modes: a first control mode in which a drive signal is output to both the first inverter 5 and the second inverter 6, and a second control mode in which the drive signal is output only to the first inverter 5 or the second inverter 6; and has a database that associates data that can determine which of the two control modes is most efficient for each of a plurality of operating conditions; and selects, based on the database, the control mode that results in the smallest total loss in the rotating machine 4, the first inverter 5, and the second inverter 6 for the operating conditions under which the rotating machine 4 is operating, thereby improving the efficiency of the drive control of the rotating machine.

[0045] Embodiment 2 Fig. 9 is a diagram showing the overall configuration of a rotating machine drive control system including a rotating machine drive control device 1a according to embodiment 2 and a rotating machine 4 added thereto. The rotating machine drive control device 1a in Fig. 9 is provided with a first power conversion circuit 31, a second power conversion circuit 32, a third current sensor 33, a fourth current sensor 34, a first voltage sensor 35, and a second voltage sensor 36. Furthermore, a controller 7a is provided in place of the controller 7 in Fig. 1, which corresponds to the rotating machine control device in this embodiment.

[0046] 10 is an example of the first power conversion circuit 31 and the second power conversion circuit 32, but any circuit or converter capable of power conversion, such as an isolated flyback converter or a non-isolated buck-boost chopper circuit, may be used. Also, while an example is shown in which MOSFETs are used as switching devices constituting the first power conversion circuit 31 and the second power conversion circuit 32, other devices such as IGBTs may also be used. Similar effects can also be obtained with a multilevel inverter circuit, such as a three-level inverter circuit.

[0047] In FIG. 10, if the inter-terminal voltages of the input side capacitors 31c and 32c are VI1 and VI2, the inter-terminal voltages of the output side capacitors 31d and 32d are VO1 and VO2, and the duty ratios (the pulse widths of the gate signals applied to the switching elements 31a and 32a and the switching elements 31b and 32b divided by the switching period) are D1 and D2, the relationship between these is given by the following equations (1) and (2). VO1=VI1 / (1-D1) (1) VO2=VI2 / (1-D2) (2)

[0048] As shown in FIG. 9 , the first connection terminal 10 is connected to a first power conversion circuit 31 and a second power conversion circuit 32. The output of the first power conversion circuit 31 is connected to a first inverter 5, and a third current sensor 33 detects a first bus current output from the first power conversion circuit 31. A first voltage sensor 35 detects a first voltage of a smoothing capacitor connected in parallel to the first inverter 5. Similarly, the output of the second power conversion circuit 32 is connected to a second inverter 6, and a fourth current sensor 34 detects a second bus current output from the second power conversion circuit 32. A second voltage sensor 36 detects a second voltage of a smoothing capacitor connected in parallel to the second inverter 6.

[0049] A signal line from the third current sensor 33 is connected to the controller 7a, and the current value of the first bus is detected. A signal line from the fourth current sensor 34 is also connected to the controller 7a, and the current value of the second bus is detected. A signal line from the controller 7a is connected to the first power conversion circuit 31, and a third gate signal is transmitted from the controller 7a. A signal line from the controller 7a is also connected to the second power conversion circuit 32, and a fourth gate signal is transmitted from the controller 7a.

[0050] 11 is a block diagram of the second controller 50 of the controller 7a, and will be used to explain a method for generating gate signals to the first power conversion circuit 31 and the second power conversion circuit 32. The induced voltage generated in the first winding 2 and the induced voltage generated in the second winding 3 are calculated, respectively, to calculate a first voltage command value and a second voltage command value so as to satisfy equations (3) and (4). First voltage command value > Induced voltage generated in the first winding 2 (3) Second voltage command value > Induced voltage generated in the second winding 3 (4)

[0051] The gate signal to the first power conversion circuit 31 is generated in the following procedure. The deviation between the first voltage command value 51 and the first voltage detected by the first voltage sensor 35 is input to the first PID controller 52 to perform PID control. The gain of the first PID controller 52 is preferably designed to be a second-order lag system. Next, the deviation between the output value of the first PID controller 52 and the current value of the first bus detected by the third current sensor 33 is input to the first PI controller 53 to perform PI control. The gain of the first PI controller 53 is designed to be a second-order lag system by treating the resistance value as a second-order lag element through feedforward compensation. The output value of the first PI controller 53 is input to the third gate signal generator 54 to obtain a gate signal to the first power conversion circuit 31.

[0052] Similarly, the gate signal to the second power conversion circuit 32 is generated in the following manner. The deviation between the second voltage command value 55 and the second voltage detected by the second voltage sensor 36 is input to the second PID controller 56 to perform PID control. The gain of the second PID controller is preferably designed to be a second-order lag system. Next, the deviation between the output value of the second PID controller 56 and the current value of the second bus detected by the fourth current sensor 34 is input to the second PI controller 57 to perform PI control. The gain of the second PI controller 57 is designed to be a second-order lag system by treating the resistance value as a second-order lag element through feedforward compensation. The output value of the second PI controller 57 is input to the fourth gate signal generator 58 to obtain a gate signal to the second power conversion circuit 32.

[0053] In the second control mode, if the induced voltage generated in the second winding 3 is greater than the output voltage of the second power conversion circuit 32, a regenerative current flows from the second winding 3 to the second inverter 6. In this embodiment, in the second control mode, the second voltage is controlled to satisfy equation (4), thereby preventing the generation of regenerative power. As a result, the loss caused by the regenerative current flowing through the second winding 3 and the second inverter 6 can be suppressed.

[0054] That is, the rotating machine control device 7a according to this embodiment is provided with a second controller 50 that outputs a drive signal to at least one of the first power conversion circuit 31 that controls the input voltage of the first inverter 5 and the second power conversion circuit 32 that controls the input voltage of the second inverter 6 based on a selected control mode, and when the second control mode is selected, the second controller 50 outputs a drive signal to the second power conversion circuit 32 so as to make the input voltage of the second inverter 6 higher than the induced voltage generated in the second winding 3 while the rotating machine 4 is operating, thereby suppressing losses caused by regenerative current flowing in the second winding 3 and the second inverter 6.

[0055] Embodiment 3 FIG. 12 is a diagram showing the overall configuration of a rotating machine drive control system including a rotating machine drive control device 1b according to a third embodiment and a rotating machine 4 added thereto. The rotating machine drive control device 1b shown in FIG. 12 is provided with a first switch 41 and a second switch 42. Furthermore, instead of the controller 7 in FIG. 1, a controller 7b is provided, which corresponds to the rotating machine control device in this embodiment. The controller 7b has a third controller 60 in addition to the first controller 20 described above.

[0056] The first switch 41 switches the connection between the DC power at the first connection terminal 10 and the first inverter 5, connecting when on and disconnecting when off. Similarly, the second switch 42 switches the connection between the DC power at the first connection terminal 10 and the second inverter 6, connecting when on and disconnecting when off. The first switch 41 and the second switch 42 may be switches for electromagnetic switches, various switching elements such as MOSFETs, thyristors, or contactors, as long as they do not allow current to flow from the input to the output when turned off.

[0057] 13, the third controller 60 inputs the determination result of the mode selection unit 61 to a first switch signal generation unit 62 and a second switch signal generation unit 63. When the determination result of the mode selection unit 61 selects the first control mode, it generates signals to turn on the first switch 41 and the second switch 42. When the determination result of the mode selection unit 61 selects the second control mode, it generates signals to turn on the first switch 41 and turn off the second switch 42. Here, the mode selection unit 61 is provided in the third controller 60, but the determination result of the mode selection unit 21 of the first controller 20 may also be used.

[0058] In the second control mode, if the induced voltage generated in the second winding 3 is greater than the DC voltage at the first connection terminal 10, a regenerative current flows from the second winding 3 to the second inverter 6. In the present embodiment, in the second control mode, the generation of regenerative power can be prevented by turning off the second switch 42. As a result, loss caused by the regenerative current flowing through the second winding 3 and the second inverter 6 can be suppressed.

[0059] It is not necessary to always turn off the second switch 42 when the second control mode is selected, and the second switch 42 may be turned off in an area that satisfies the following formula (5), and turned on in an area that does not satisfy formula (5). For example, the on / off state of the second switch 42 may be set using a table with the rotation speed and the control command as two axes. DC voltage at the first connection terminal 10 < Induced voltage generated in the second winding 3 (5)

[0060] That is, the rotating machine control device 7b according to this embodiment includes a third controller 60 that outputs a drive signal to at least one of the first switch 41 that switches the input power of the first inverter 5 on and off and the second switch 42 that switches the input power of the second inverter 6 on and off based on the selected control mode, and when the second control mode is selected, the third controller 60 outputs a drive signal to the second switch 42 to turn off the second switch 42, thereby suppressing losses caused by regenerative current flowing through the second winding 3 and the second inverter 6.

[0061] Embodiment 4 14 is a diagram showing the overall configuration of a rotating machine drive control system including a rotating machine drive control device 1c according to embodiment 4 and a rotating machine 4 added thereto, and this rotating machine drive control device 1c is provided with a first inverter 5a, a second inverter 6a, and a controller 7c instead of the first inverter 5, the second inverter 6, and the controller 7 of Fig. 1. The controller 7c corresponds to the rotating machine control device in this embodiment, and has a first controller 20a instead of the first controller 20 described above.

[0062] The first inverter 5a includes a first switching element 5b, which is a bidirectional switching element formed by connecting two reverse-blocking switching elements in anti-parallel. Similarly, the second inverter 6a includes a second switching element 6b, which is a bidirectional switching element formed by connecting two reverse-blocking switching elements in anti-parallel.

[0063] 15 is a block diagram of a first controller 20a constituting a part of the controller 7c. Instead of the first gate signal generating unit 24 and the second gate signal generating unit 25 in FIG. 2, a first gate signal generating unit 24a and a second gate signal generating unit 25a are provided.

[0064] During powering operation, the first gate signal generator 24a provides gate signals to turn on or off 5uH_a, 5vH_a, 5wH_a, 5uL_a, 5vL_a, and 5wL_a (forward direction side) in the first switching element 5b based on a voltage command to the first inverter 5a. On the other hand, it provides gate signals to turn off 5uH_b, 5vH_b, 5wH_b, 5uL_b, 5vL_b, and 5wL_b (reverse direction side) regardless of the voltage command to the first inverter 5a. During regenerative operation, it provides gate signals to turn on or off 5uH_b, 5vH_b, 5wH_b, 5uL_b, 5vL_b, and 5wL_b (reverse direction side) in the first switching element 5b based on a voltage command to the first inverter 5a. On the other hand, regardless of the voltage command to the first inverter 5a, gate signals are applied to turn off 5uH_a, 5vH_a, 5wH_a, 5uL_a, 5vL_a and 5wL_a (forward direction side).

[0065] During powering operation with the first control mode selected, the second gate signal generator 25a provides gate signals to turn on or off 6uH_a, 6vH_a, 6wH_a, 6uL_a, 6vL_a, and 6wL_a (forward direction side) in the second switching element 6b based on a voltage command to the second inverter 6a. On the other hand, it provides gate signals to turn off 6uH_b, 6vH_b, 6wH_b, 6uL_b, 6vL_b, and 6wL_b (reverse direction side) regardless of the voltage command to the second inverter 6a. During regenerative operation with the first control mode selected, it provides gate signals to turn on or off 6uH_b, 6vH_b, 6wH_b, 6uL_b, 6vL_b, and 6wL_b (reverse direction side) in the second switching element 6b based on a voltage command to the second inverter 6a. On the other hand, regardless of the voltage command to the second inverter 6a, gate signals are applied to turn off 6uH_a, 6vH_a, 6wH_a, 6uL_a, 6vL_a and 6wL_a (forward direction side).

[0066] When the second control mode is selected, a gate signal is applied to turn off all of the second switching elements 6b (6uH_a, 6vH_a, 6wH_a, 6uL_a, 6vL_a, 6wL_a, 6uH_b, 6vH_b, 6wH_b, 6uL_b, 6vL_b, and 6wL_b), thereby blocking the current flowing into and out of the second winding 3 when the second control mode is selected.

[0067] In the configuration of the first embodiment, if the induced voltage generated in the second winding 3 is high, a regenerative current flows through the body diode even when the switching element is turned off. However, in this embodiment, a gate signal is applied to prevent the regenerative current from passing through the bidirectional switching element, which is an inverse-parallel connection of a reverse-blocking switching element, so that the regenerative current does not flow. As a result, it is possible to suppress losses caused by the regenerative current flowing through the second winding 3 and the second inverter 6a.

[0068] That is, in the rotating machine control device 7c according to this embodiment, the second inverter 6a is composed of switching elements 6b connected in anti-parallel and having the function of diodes, and when the second control mode is selected, the first controller 20a outputs a drive signal to the second inverter 6a to turn off all of the switching elements 6b, thereby suppressing losses caused by regenerative current flowing through the second winding 3 and the second inverter 6a.

[0069] The controllers 7, 7a, 7b, and 7c, the first controllers 20 and 20a, the second controller 50, and the third controller 60 are each configured with a processor 100 and a storage device 101, as shown in FIG. 16, which illustrates an example of hardware. The storage device is not shown, but includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. A hard disk auxiliary storage device may be used instead of the flash memory. The processor 100 executes a program input from the storage device 101. In this case, the program is input to the processor 100 from the auxiliary storage device via the volatile storage device. The processor 100 may output data such as calculation results to the volatile storage device of the storage device 101, or may store the data in the auxiliary storage device via the volatile storage device.

[0070] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0071] Various aspects of the present disclosure are summarized below as appendices.

[0072] (Appendix 1) A control device for a rotating machine that controls a rotating machine having a first winding and a second winding magnetically coupled to the first winding via a first inverter connected to the first winding and a second inverter connected to the second winding, a first controller that outputs a drive signal to at least one of the first inverter and the second inverter based on an operating condition that is a combination of a rotation speed of the rotating machine and a control command related to torque or power for driving the rotating machine; a database that associates data that can determine which of the two control modes is most efficient with each of a plurality of operating conditions; and a control device for a rotating machine that selects, based on the database, the control mode that results in the smallest total loss in the rotating machine, the first inverter, and the second inverter for the operating conditions under which the rotating machine is operating. (Appendix 2) 2. The rotating machine control device according to claim 1, wherein the data is the total loss in each of the first control mode and the second control mode. (Appendix 3) 2. The control device for a rotating machine according to claim 1, wherein the data is the control mode that reduces the total loss out of the two control modes. (Appendix 4) defining, based on the database, a curve obtained by plotting, on a two-dimensional plane defined by an axis of the rotational speed and an axis of the control command, a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal; 2. The control device for a rotating machine according to claim 1, wherein, in a powering operation in which the control command is greater than 0, the first controller selects the first control mode when the control command is on the larger side of the curve in a direction of the axis of the control command, and selects the second control mode when the control command is on the smaller side of the curve in the direction of the axis of the control command. (Appendix 5) defining, based on the database, a curve obtained by plotting, on a two-dimensional plane defined by an axis of the rotational speed and an axis of the control command, a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal; The control device for a rotating machine according to claim 1, characterized in that, in the case of regenerative operation in which the control command is smaller than 0, the first controller selects the second control mode when the control command is on the larger side of the curve in the direction of the axis of the control command, and selects the first control mode when the control command is on the smaller side of the curve in the direction of the axis of the control command. (Appendix 6) a curve obtained by plotting a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal on a two-dimensional plane formed by an axis of the rotational speed and an axis of the control command on the two-dimensional plane, and defining the curve based on the database; and defining the smaller of two points at which the curve intersects with the axis of the rotational speed in the case of powering operation where the control command is greater than 0 as a first rotational speed and the larger of two points as a second rotational speed; 2. The control device for a rotating machine according to claim 1, wherein the first controller selects the first control mode when the rotational speed of the rotating machine during operation is lower than the first rotational speed or higher than the second rotational speed. (Appendix 7) a curve obtained by plotting a plurality of operating conditions in which the total loss in the first control mode and the total loss in the second control mode are equal on a two-dimensional plane formed by an axis of the rotational speed and an axis of the control command on the two-dimensional plane, and defining the curve based on the database; and defining the smaller of two points where the curve intersects with the axis of the rotational speed in the case of regenerative operation in which the control command is smaller than 0 as a third rotational speed and the larger of two points as a fourth rotational speed; The control device for a rotating machine according to claim 1, wherein the first controller selects the first control mode when the rotational speed during operation of the rotating machine is lower than the third rotational speed or higher than the fourth rotational speed. (Appendix 8) the curve has a section where the absolute value of the control command monotonically increases, a section where the absolute value is constant, and a section where the absolute value monotonically decreases as the rotation speed increases, The control device for a rotating machine according to any one of Supplementary Note 4 to 7, wherein the first controller selects the first control mode or the second control mode by comparing the operating conditions during operation of the rotating machine with the curve. (Appendix 9) a second controller that outputs a drive signal to at least one of a first power conversion circuit that controls an input voltage of the first inverter and a second power conversion circuit that controls an input voltage of the second inverter based on the selected control mode; 9. The control device for a rotating machine according to claim 1, wherein, when the second control mode is selected, the second controller outputs the drive signal to the second power conversion circuit so as to make the input voltage of the second inverter higher than an induced voltage generated in the second winding while the rotating machine is operating. (Appendix 10) a third controller that outputs a drive signal to at least one of a first switch that switches on and off the input power of the first inverter and a second switch that switches on and off the input power of the second inverter based on the selected control mode; 9. The rotating machine control device according to claim 1, wherein, when the second control mode is selected, the third controller outputs the drive signal to the second switch so as to turn off the second switch. (Appendix 11) the second inverter is composed of switching elements connected in antiparallel and having a function of diodes, 9. The rotating machine control device according to claim 1, wherein when the second control mode is selected, the first controller outputs a drive signal to a second inverter to turn off all of the switching elements. (Appendix 12) a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; A drive control device for a rotating machine comprising: a rotating machine control device according to any one of appendices 1 to 8 and 11, which controls the first inverter and the second inverter. (Appendix 13) a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; a first power conversion circuit that controls an input voltage of the first inverter; a second power conversion circuit that controls an input voltage of the second inverter; A drive control device for a rotating machine comprising the rotating machine control device according to Supplementary Note 9. (Appendix 14) a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; a first switch for switching on and off the input power of the first inverter; a second switch for switching on and off the input power of the second inverter; A drive control device for a rotating machine comprising: the rotating machine control device according to claim 10. (Appendix 15) a rotating machine having a first winding and a second winding magnetically coupled to the first winding; A drive control system for a rotating machine, comprising: a drive control device for a rotating machine according to any one of appendices 12 to 14, which drives and controls the rotating machine via the first inverter and the second inverter. [Explanation of symbols]

[0073] 1, 1a, 1b, 1c: drive control device for rotating machine, 2: first winding, 3: second winding, 4: rotating machine, 5: first inverter, 6, 6a: second inverter, 6b: switching element, 7, 7a, 7b, 7c: controller, 20, 20a: first controller, 31: first power conversion circuit, 32: second power conversion circuit, 50: second controller, 41: first switch, 42: second switch, 60: third controller

Claims

1. A control device for a rotating machine that controls a rotating machine having a first winding and a second winding magnetically coupled to the first winding via a first inverter connected to the first winding and a second inverter connected to the second winding, a first controller that outputs a drive signal to at least one of the first inverter and the second inverter based on an operating condition that is a combination of a rotation speed of the rotating machine and a control command related to torque or power for driving the rotating machine; a database that associates data that can determine which of the two control modes is more efficient with each of a plurality of operating conditions; and a control device for a rotating machine, characterized in that the first controller has two control modes: a first control mode in which the drive signal is output to both the first inverter and the second inverter, and a second control mode in which the drive signal is output only to the first inverter or the second inverter; and the control device selects, based on the database, the control mode that reduces the total loss generated in the rotating machine, the first inverter, and the second inverter for the operating conditions during operation of the rotating machine.

2. 2. The control device for a rotating machine according to claim 1, wherein the data is the total loss in each of the first control mode and the second control mode.

3. 2. The control device for a rotating machine according to claim 1, wherein the data is the control mode that reduces the total loss out of the two control modes.

4. defining, based on the database, a curve obtained by plotting, on a two-dimensional plane defined by an axis of the rotational speed and an axis of the control command, a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal; 2. The control device for a rotating machine according to claim 1, wherein, in a powering operation in which the control command is greater than 0, the first controller selects the first control mode when the control command is on the larger side of the curve in a direction of the axis of the control command, and selects the second control mode when the control command is on the smaller side of the curve in the direction of the axis of the control command.

5. defining, based on the database, a curve obtained by plotting, on a two-dimensional plane defined by an axis of the rotational speed and an axis of the control command, a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal; 2. The control device for a rotating machine according to claim 1, wherein, in the case of regenerative operation in which the control command is smaller than 0, the first controller selects the second control mode when the control command is on the larger side of the curve in the direction of the axis of the control command, and selects the first control mode when the control command is on the smaller side of the curve in the direction of the axis of the control command.

6. a curve obtained by plotting a plurality of operating conditions under which the total loss in the first control mode and the total loss in the second control mode are equal on a two-dimensional plane defined by an axis of the rotational speed and an axis of the control command on the two-dimensional plane, and defining the curve based on the database; and defining the smaller of two points at which the curve intersects with the axis of the rotational speed in the case of powering operation where the control command is greater than 0 as a first rotational speed and the larger of two points as a second rotational speed; 2. The control device for a rotating machine according to claim 1, wherein the first controller selects the first control mode when the rotational speed of the rotating machine during operation is lower than the first rotational speed or higher than the second rotational speed.

7. a curve obtained by plotting a plurality of operating conditions in which the total loss in the first control mode and the total loss in the second control mode are equal on a two-dimensional plane formed by an axis of the rotational speed and an axis of the control command on the two-dimensional plane, and defining the curve based on the database; and defining the smaller of two points where the curve intersects with the axis of the rotational speed in the case of regenerative operation in which the control command is smaller than 0 as a third rotational speed and the larger of two points as a fourth rotational speed; 2. The control device for a rotating machine according to claim 1, wherein the first controller selects the first control mode when the rotational speed of the rotating machine during operation is lower than the third rotational speed or higher than the fourth rotational speed.

8. the curve has a section where the absolute value of the control command monotonically increases, a section where the absolute value is constant, and a section where the absolute value monotonically decreases as the rotation speed increases, 8. The control device for a rotating machine according to claim 4, wherein the first controller selects the first control mode or the second control mode by comparing the operating conditions during operation of the rotating machine with the curve.

9. a second controller that outputs a drive signal to at least one of a first power conversion circuit that controls an input voltage of the first inverter and a second power conversion circuit that controls an input voltage of the second inverter based on the selected control mode; 2. The control device for a rotating machine according to claim 1, wherein, when the second control mode is selected, the second controller outputs the drive signal to the second power conversion circuit so as to make the input voltage of the second inverter higher than an induced voltage generated in the second winding while the rotating machine is operating.

10. a third controller that outputs a drive signal to at least one of a first switch that switches on and off the input power of the first inverter and a second switch that switches on and off the input power of the second inverter based on the selected control mode; 2. The control device for a rotating machine according to claim 1, wherein, when the second control mode is selected, the third controller outputs the drive signal to the second switch so as to turn off the second switch.

11. the second inverter is composed of switching elements connected in antiparallel and having a function of a diode, 2. The rotating machine control device according to claim 1, wherein when the second control mode is selected, the first controller outputs a drive signal to the second inverter so as to turn off all of the switching elements.

12. a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; A drive control device for a rotating machine comprising: the rotating machine control device according to claim 1, which controls the first inverter and the second inverter.

13. a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; a first power conversion circuit that controls an input voltage of the first inverter; a second power conversion circuit that controls an input voltage of the second inverter; A drive control device for a rotating machine, comprising the rotating machine control device according to claim 9.

14. a first inverter connected to a first winding of a rotating machine and a second inverter connected to a second winding of the rotating machine magnetically coupled to the first winding; a first switch for switching on and off the input power of the first inverter; a second switch for switching on and off the input power of the second inverter; A drive control device for a rotating machine, comprising the rotating machine control device according to claim 10.

15. a rotating machine having a first winding and a second winding magnetically coupled to the first winding; A drive control system for a rotating machine, comprising: the drive control device for a rotating machine according to any one of claims 12 to 14, which drives and controls the rotating machine via the first inverter and the second inverter.

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