CN113541535A

CN113541535A - Rotating electric machine control device

Info

Publication number: CN113541535A
Application number: CN202110377923.9A
Authority: CN
Inventors: 佐藤大介; 金原义彦; 中野晃太郎; 松浦大树
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-04-17
Filing date: 2021-04-08
Publication date: 2021-10-22
Also published as: JP2021170899A; JP6921273B1

Abstract

When a plurality of inverters controlled by PWM are operated in parallel, if the region of the carrier frequency is limited for each inverter with a view to noise reduction, there is a problem as follows: the switching losses of the motor using a higher carrier frequency are always deteriorated, and the current ripple in the motor using a lower carrier frequency is always deteriorated. The rotating electric machine control device of the present invention has a combination pattern in which 1 PWM pattern is set as a relationship between an input/output state of an inverter and a carrier frequency, and 2 or more PWM patterns are combined in accordance with a region of the input/output state, and includes a PWM pattern determination unit that switches the PWM patterns in accordance with the combination pattern that differs for each of the inverters.

Description

Rotating electric machine control device

Technical Field

The present application relates to a rotating electric machine control device.

Background

When a plurality of inverters are operated in parallel, the PWM mode, which is a relationship between the input/output state of the inverter and the carrier frequency, is generally common to the plurality of inverters. However, when the carrier frequencies operating in the plurality of inverters are matched, noise generated by switching of the inverter elements is overlapped, and there is a problem that the noise becomes large.

As a countermeasure against the above problem, for example, a technique as described in patent document 1 is known. Patent document 1 shows the following cases: the carrier frequencies having a specific bandwidth are set so as not to overlap each other among the plurality of inverters, thereby reducing noise generated by switching of the inverter elements.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2011/135687

Disclosure of Invention

Technical problem to be solved by the invention

The rotating electric machine control device based on the PWM control has the following problems: when the carrier frequency is high, the switching loss due to PWM control increases, and when the carrier frequency is low, the current ripple deteriorates, and the control becomes unstable. In order to perform stable PWM control, the PWM mode needs to be set in consideration of the switching loss and the current ripple, and needs to be set appropriately so that the switching loss and the current ripple do not become large according to the fundamental frequency or the output current of the inverter.

However, the rotating electric machine control device described in patent document 1 has the following problems: focusing only on the reduction of noise, the switching loss of the motor using a high carrier frequency is always deteriorated, and the current ripple in the motor using a low carrier frequency is always deteriorated.

In view of the above-described problems, an object of the present invention is to provide a rotating electrical machine control device capable of performing stable PWM control while taking into account reduction of switching loss and reduction of current ripple in the case of operating a plurality of inverters in parallel, and achieving noise reduction.

Technical scheme for solving technical problem

The rotating electric machine control device according to the present application is a rotating electric machine control device having a plurality of inverters controlled by PWM, and the rotating electric machine control device has a combination pattern in which 2 or more PWM patterns are combined in accordance with a range of the input/output state, assuming that a relationship between the input/output state of the inverters and a carrier frequency is 1 PWM pattern, and includes a PWM pattern determination unit that switches the PWM patterns in accordance with the combination pattern that differs for each of the inverters.

Effects of the invention

According to the rotating electric machine control device of the present application, since 2 or more PWM modes can be set for each inverter, stable PWM control can be performed by switching to an appropriate PWM mode according to the region of the input/output state. Further, the combination patterns obtained by combining the PWM patterns are different in each inverter, and therefore, the capability map reduces noise caused by the overlap of the carrier frequencies between the inverters.

Drawings

Fig. 1 is a configuration diagram illustrating a rotating electric machine control device according to embodiment 1.

Fig. 2 is a diagram illustrating a processing circuit of the inverter control unit according to embodiment 1.

Fig. 3 is a diagram showing an example of setting the PWM pattern based on the fundamental wave frequency of the inverter according to embodiment 1.

Fig. 4 is a diagram showing an example of setting the PWM mode based on the output current of the inverter according to embodiment 1.

Fig. 5 is a diagram showing an example of setting the PWM pattern based on the fundamental wave frequency of the inverter according to embodiment 1.

Fig. 6 is a diagram showing an example of setting the PWM mode using the random PWM of the inverter according to embodiment 1.

Fig. 7 is a diagram showing an example of setting the PWM mode between the plurality of inverters according to embodiment 1.

Fig. 8A is a flowchart illustrating an operation in the PWM mode by the inverter according to embodiment 1.

Fig. 8B is a flowchart illustrating an operation in the PWM mode by the inverter according to embodiment 1.

Fig. 9 is a diagram showing an example of setting the PWM mode between a plurality of inverters according to embodiment 1.

Fig. 10 is a flowchart illustrating an operation based on the PWM mode of the inverter according to embodiment 1.

Fig. 11 is a diagram showing an example of setting the PWM pattern based on the fundamental wave frequency of the inverter according to embodiment 1.

Fig. 12 is a diagram showing an example of setting the PWM mode between a plurality of inverters according to embodiment 1.

Fig. 13 is a diagram showing an example of setting the PWM mode between the plurality of inverters according to embodiment 1.

Detailed Description

Embodiment 1.

An inverter and a rotating electric machine according to embodiment 1 will be described with reference to the drawings. Fig. 1 is a structural diagram of a rotating electric machine control device including a plurality of inverters according to the present embodiment and a plurality of rotating electric machines driven by the rotating electric machine control device. In the following description of the embodiments, 2 inverters and 2 rotating electric machines driven by the inverters will be described as an example.

For example, the first rotating electrical machine 1a is a permanent magnet type synchronous rotating electrical machine in which a stator has a multi-phase (in this example, three-phase) winding and a rotor has a permanent magnet, and the second rotating electrical machine 1b is a permanent magnet type synchronous rotating electrical machine in which a stator has a multi-phase (in this example, three-phase) winding and a rotor has a permanent magnet.

The rotating electrical machine control device 100 includes a first inverter 20a for driving the first rotating electrical machine 1a, and a first inverter control unit 30a for controlling the first inverter 20 a. The rotating electrical machine control device 100 further includes a second inverter 20b for driving the second rotating electrical machine 1b, and a second inverter control unit 30b for controlling the second inverter 20 b.

The first inverter 20a is a power conversion device that converts direct current from a direct current power supply into alternating current and supplies the alternating current to a multi-phase winding of the first rotating electric machine 1a, and includes a plurality of switching elements. The second inverter 20b is a power conversion device that converts direct current from a direct current power supply into alternating current and supplies the alternating current to a multi-phase winding of the second rotating electric machine 1b, and includes a plurality of switching elements. The first and

second inverters

20a and 20b are provided with a series circuit in which a positive-side switching element connected to a positive side of the dc power supply and a negative-side switching element connected to a negative side of the dc power supply are connected in series, respectively, in correspondence with the windings of the respective phases. The connection points of the 2 switching elements in each series circuit are connected to the windings of the respective phases of the first and second rotating

electrical machines

1a, 1 b. Each of the first and

second inverters

20a and 20b has a current sensor for detecting an output current flowing through each winding. The detected output currents are input to the first and second

inverter control units

30a and 30b, respectively, as effective values of three-phase ac currents.

As the switching element, an IGBT (Insulated Gate Bipolar Transistor) having a diode connected in reverse parallel, a Bipolar Transistor having a diode connected in reverse parallel, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or the like is used. The gate terminal of each switching element is connected to first and second

PWM control sections

31a and 31b provided in the first and second

inverter control sections

30a and 30b, respectively, via a gate drive circuit or the like. Thereby, the switching elements are turned on or off by the first and second

PWM control sections

31a and 31b provided to the first and second

inverter control sections

30a and 30b, respectively.

The first inverter control unit 30a includes a first PWM control unit 31a and a first PWM pattern determination unit 32 a. The first PWM control unit 31a generates an ac voltage pattern of three-phase ac developed such that the phases of sine waves of the fundamental wave frequency are shifted by 120 degrees, respectively, based on the fundamental wave frequency supplied to the first inverter control unit 30a as a command value. The ac voltage pattern of each phase of the ac voltage is compared with a carrier wave (for example, a triangular wave) generated based on the carrier frequency instructed by the PWM pattern determination unit, and a switching signal is generated based on the comparison result. The carrier frequency of the first PWM control unit 31a is determined by the first PWM pattern determination unit 32a based on the input/output state 33a input to the first inverter control unit 30a as the sensing information. The details are set forth hereinafter.

The second inverter control unit 30b includes a second PWM control unit 31b and a second PWM pattern determination unit 32 b. The second PWM control unit 31b generates an ac voltage pattern of three-phase ac developed such that the phases of sine waves of the fundamental wave frequency are shifted by 120 degrees, respectively, based on the fundamental wave frequency supplied to the second inverter control unit 30b as a command value. The ac voltage pattern of each phase of the ac voltage is compared with a carrier wave (for example, a triangular wave) generated based on the carrier frequency instructed by the PWM pattern determination unit, and a switching signal is generated based on the comparison result. The carrier frequency of the second PWM control unit 31b is determined by the second PWM pattern determination unit 32b based on the input/output state 33b input to the second inverter control unit 30b as the sensing information. The details are set forth hereinafter.

As shown in fig. 2, the first inverter control unit 30a and the second inverter control unit 30b include a processing circuit having a processor 201 and a memory device 202 as cores, and the processing of each unit is realized by the processing circuit. The processing Circuit may include an ASIC (application Specific integrated Circuit), an FPGA (Field Programmable Gate Array), various logic circuits, various signal processing circuits, and the like.

The first inverter control unit 30a includes the first inverter 20a and the first rotating electric machine 1a, and collects information from various devices and sensors on the input/output state 33 a. For example, the fundamental wave frequency 33a1, which is a command value supplied to the first inverter control unit 30a, and the output current 33a2 of the first inverter 20 a. The fundamental wave frequency 33a1 is a command value proportional to the rotation speed of the first rotating electrical machine 1a, and may be substituted for the rotation speed sensed from the first rotating electrical machine 1 a. The output current 33a2 is input to the first inverter control unit 30a as an effective value of the output current of each phase of the first inverter 20 a. The current value may replace the current value of the direct-current power supply supplied to the first inverter 20 a. The output current 33a2 may be a current of a torque component or may be a current amplitude.

The second inverter control unit 30b includes the second inverter 20b and the second rotating electric machine 1b, and collects information from various devices and sensors on the input/output state 33 b. For example, the fundamental wave frequency 33b1 as a command value supplied to the second inverter control unit 30b, and the output current 33b2 of the second inverter 20 b. The fundamental wave frequency 33b1 is a command value proportional to the rotation speed of the second rotating electrical machine 1b, and may be substituted for the rotation speed sensed from the second rotating electrical machine 1 b. The output current 33b2 is input to the second inverter control unit 30b as an effective value of the output current of each phase of the second inverter 20 b. The current value may replace the current value of the direct-current power supply supplied to the second inverter 20 b. The output current 33b2 may be a current of a torque component or may be a current amplitude.

Hereinafter, in fig. 3 to 6, the respective PWM patterns provided in the first PWM pattern determining unit 32a corresponding to the first inverter 20a and the second PWM pattern determining unit 32b corresponding to the second inverter 20b will be described. In either of the first and second PWM patterns, since the first and second PWM

pattern determination units

32a and 32b do not differ in their operation and function with respect to the input/

output states

33a and 33b, the first PWM pattern determination unit 32a and the input/output state 33a thereof will be described as an example in the following description, except for the case where they are specifically described.

Fig. 3 shows an example in which 2 PWM patterns are set and the PWM patterns are switched according to the fundamental wave frequency 33a1 of the first inverter 20 a. The PWM mode at this time is 2 of the asynchronous PWM and the synchronous PWM. In a state where the fundamental wave frequency 33a1 is low, the carrier frequency is kept constant, and when the carrier frequency is equal to or greater than the threshold value a, the carrier frequency is increased in proportion to an increase in the fundamental wave frequency 33a 1.

There are several constraints in deciding the PWM mode. First, when the carrier frequency is set to be high, the period of the carrier wave becomes very fine, so that the PWM control can be performed in a state closer to a continuous waveform, and the stability of the control is improved. On the other hand, the number of switching times of the element by PWM control increases, and there is a possibility that the switching loss increases. Conversely, if the carrier frequency is set low, the switching loss decreases, but the control may become unstable. Thus, there is a trade-off relationship between switching loss and control stability in setting the carrier frequency, and it is necessary to appropriately set the carrier frequency.

As the fundamental wave frequency 33a1 of the first inverter 20a becomes higher, the carrier frequency needs to be set higher in order to perform stable control. As an effective PWM pattern for setting the carrier frequency to be high, there is synchronous PWM. By changing the carrier frequency in synchronization with the fundamental wave frequency 33a1 of the first inverter 20a, the region where the fundamental wave frequency is high can be controlled by 1 PWM pattern.

However, if synchronous PWM is also performed in a region where the fundamental frequency 33a1 is low, the carrier frequency becomes too low, and control may fail. Therefore, stable control can be performed by using asynchronous PWM in which the carrier frequency is constant in a region where the fundamental wave frequency is low. Fig. 3 shows an example in which the 2 PWM patterns of the asynchronous PWM and the synchronous PWM are set as the combination pattern according to the change in the fundamental frequency.

Fig. 4 shows 2 combination modes of the PWM modes switched according to the output current 33a2 of the first inverter 20a as an example of the input-output state 33 a. The number of PWM modes in this case is 2 depending on the carrier frequency of the asynchronous PWM. By switching the PWM mode in accordance with the output current 33a2, the carrier frequency can be set high in a state where the output current 33a2 is large, and more stable PWM control can be performed.

In the present embodiment, the first PWM pattern determining unit 32a and the second PWM pattern determining unit 32b are configured to have different combinations of PWM patterns so as to reduce the overlap of carrier frequencies between the first and second inverters. Based on the characteristics of the first and second rotating

electric machines

1a and 1b to be controlled, the first and second PWM

pattern determination units

32a and 32b select any appropriate combination pattern to perform PWM control. Therefore, various combination patterns are assumed as combinations of PWM patterns, and these combination patterns will be described.

Setting the carrier frequency of the asynchronous PWM to different values is also a different PWM mode. Setting the number of pulses of the synchronous PWM to different numbers of pulses may also be referred to as different combination patterns of the PWM patterns. Fig. 5 is an example of a combination pattern of PWM patterns different from fig. 3, as compared with the case of fig. 3, as follows: the carrier frequency of the asynchronous PWM is low, and the slope of the increase in carrier frequency in the synchronous PWM region with respect to the fundamental frequency 33a1 is large. In fig. 3, the value of the fundamental wave frequency 33a1 for switching the PWM mode from asynchronous PWM to synchronous PWM is set so that the threshold value a is different from the threshold value b.

If the inverter 20a continues to operate at the same carrier frequency, noise of a specific frequency is generated even by the inverter alone, and therefore, a technique of randomly changing the carrier frequency within a specific frequency range is known as a noise reduction method. As the PWM pattern to be set, random PWM in which the carrier frequency is randomly varied within a certain frequency range can be used. The PWM pattern of the random PWM and the non-random PWM is switched according to the variation of the fundamental frequency 33a1 as an example of the combination pattern shown in fig. 6.

The first and

second inverters

20a, 20b are set so as to be paired with the first and second rotating

electrical machines

1a, 1b, respectively, and the setting of an appropriate carrier frequency also varies depending on parameters caused by the characteristics inherent to the rotating electrical machines. Therefore, when appropriate carrier frequencies are set for the first and second rotating

electric machines

1a and 1b, respectively, it is possible to perform control with higher efficiency by setting the PWM modes to be different from the common PWM mode. Therefore, the combination pattern of the PWM patterns is changed to be set to different settings so that the PWM patterns set in the plurality of inverters do not all coincide.

Fig. 7 shows an example of setting the carrier frequency with respect to the fundamental wave frequencies 33a1 and 33b1 of the first and

second inverters

20a and 20b, respectively. Each of the PWM

pattern determination units

32a and 32b has 2 patterns of asynchronous PWM and synchronous PWM, and is set so that the timing of PWM pattern switching differs among the 2 inverters. Fig. 8A shows an operation flow of the first PWM pattern determining unit 32a that determines the PWM pattern of the first inverter 20a shown in fig. 7. In step S11, it is determined whether or not the fundamental wave frequency 33a1 of the first inverter 20a is smaller than the threshold value a, and in step S12, the PWM pattern a to be the asynchronous PWM is selected, and in step S13, if the fundamental wave frequency of the inverter is equal to or higher than the threshold value a, the PWM pattern b to be the synchronous PWM is selected. Similarly, fig. 8B shows an operation flow of the second PWM pattern determination unit 32B that determines the PWM pattern of the second inverter 20B shown in fig. 7. In step S21, it is determined whether or not the fundamental wave frequency 33b1 of the inverter 20b is smaller than the threshold b, and in step S22, the PWM pattern b for asynchronous PWM is selected, and in step S23, if the fundamental wave frequency 33b1 of the inverter 20b is not less than the threshold b, the PWM pattern b for synchronous PWM is selected.

If the number of PWM patterns to be combined is 2 or more per inverter, any number may be used, and fig. 9 shows a case where there are 4 PWM patterns in each of first inverter 20a and second inverter 20 b. An example of a combination pattern in which the PWM patterns are switched according to the fundamental frequencies 33a1 and 33b1 is shown.

Fig. 10 is an operation flow for explaining the operation of the first PWM pattern determining unit 32a, which takes the first inverter 20a as an example, and shows an example of the following case: as the input/output state 33a for determining the PWM pattern, 4 PWM patterns a to d are switched by combining the output current 33a2 and 2 parameters of the fundamental wave frequency 33a 1. First, in step S31, it is determined whether or not the output current 33a2 is larger than the threshold value a. As a result of the determination, in the case of being smaller than the threshold a, the fundamental wave frequency 33a1 is further compared with the threshold b in step S32, and according to the result, the PWM mode is switched to the PWM mode a in step S33 and to the PWM mode b in step S34. In addition, in the case where the output current 33a2 is equal to or greater than the threshold value a in step S31, the fundamental wave frequency 33a1 is further compared with the threshold value c in step S35, and according to the result, the PWM mode is switched to the PWM mode c in step S36 and the PWM mode is switched to the PWM mode d in step S37.

As described above, in the control of fig. 10, the PWM pattern is set to be finer according to the change in both the output current 33a2 and the fundamental wave frequency 33a1, and the appropriate PWM pattern can be set according to the state of the first inverter 20a and the first rotating electric machine 1 a.

Fig. 11 shows the following case: by setting different PWM modes in both the first and

second inverters

20a, 20b, a carrier frequency region can be generated which is used only by the second inverter 20b and not used by the first inverter 20 a. The switching noise may increase when the PWM patterns overlap, but the combination pattern may be set so that the PWM patterns of the plurality of inverters do not overlap with respect to a region of a specific carrier frequency in which noise reduction is intended. This can prevent an increase in noise in a region of the carrier frequency where noise reduction is desired.

As described above, the rotating electrical machine control device 100 according to embodiment 1 has 1 PWM pattern in which the relationship of carrier frequencies that change in accordance with the input/

output states

33a and 33b of the first and

second inverters

20a and 20b, respectively, and has a first and second PWM

pattern determining unit

32a and 32b that set a combination pattern of 2 or more PWM patterns in accordance with the region of the input/

output states

33a and 33b, respectively, so that the PWM patterns that are combined in accordance with the input/

output states

33a and 33b of the first and

second inverters

20a and 20b are different, and that switch the PWM patterns in accordance with the input/

output states

33a and 33b, respectively.

With this configuration, 2 or more PWM modes can be set for each of the first and

second inverters

20a and 20b, and stable PWM control can be performed by setting the PWM modes taking into account reduction of switching loss and reduction of current ripple according to the region of the input/output state. Further, the combination patterns combined for each of the first and

second inverters

20a, 20b are different, and therefore it is possible to attempt to reduce noise caused by the overlap of the carrier frequencies between the first inverter 20a and the second inverter 20 b.

Further, the PWM mode can be set so that the regions of the specific carrier frequencies do not overlap between each of the first and

second inverters

20a, 20b, and an increase in noise can be prevented in the region of the carrier frequency where noise reduction is desired.

Embodiment 2.

In embodiment 2, the setting of the PWM mode is described in consideration of noise reduction in the entire system (for example, the entire vehicle in which the system is mounted) in which the rotating electric machine control device 100 including the plurality of first and

second inverters

20a and 20b shown in fig. 1 and the first and second rotating

electric machines

1a and 1b driven by the rotating electric machine control device are mounted.

When the PWM mode is set, a frequency region in which noise is avoided is set for each of the first and

second inverters

20a, 20b, respectively. As the entire system having the configuration of fig. 1, the region of the carrier frequency for avoiding noise may be determined by a frequency region in which noise tends to increase. If the first inverter 20a and the second inverter 20b operate in the PMW mode at the same carrier frequency in a frequency region in which noise is to be avoided as the entire system, PWM switching noise may overlap, and noise may further increase as the entire system. Therefore, by setting the combination pattern of the PWM patterns for each of the first and

second inverters

20a, 20b so that the regions of the avoided carrier frequencies do not overlap, it is possible to prevent an increase in noise as a whole of the system.

In fig. 12, as the entire system, the region of the carrier frequency for avoiding noise is avoided in both the first inverter 20a and the second inverter 20 b. If possible, by avoiding the region of the carrier frequency to be avoided in all the inverters, it is possible to prevent the noise from increasing in the region of the carrier frequency.

However, if the PWM pattern appropriately set according to the input/output states of the first inverter 20a and the second inverter 20b does not overlap with the region of the carrier frequency to be avoided from noise in the entire system, if the region of the same carrier frequency is avoided in all the inverters, there is a possibility that the operation cannot be performed efficiently.

Fig. 13 shows an example of setting the PWM mode in the case where only the second inverter 20b avoids the frequency region where noise is avoided, as compared with fig. 12. By setting only one inverter to be avoided for a frequency region in which noise is avoided as a whole system, the system can operate efficiently and noise can be reduced.

The inverter that avoids noise as the whole system may be only one of the plurality of inverters, or may be avoided in all the inverters. If the number of avoided inverters is increased one by one and the noise reduction reaches the required level of noise, it is preferable that the remaining inverters do not need to be in the region of the carrier frequency to be avoided, and a highly efficient combination pattern of PWM patterns is set, so that a desired noise reduction effect can be obtained and the inverters can be operated efficiently.

According to the present embodiment, in addition to the PWM pattern matching the input/output state of the inverter set in embodiment 1, a combination pattern of the PWM patterns can be set in which the reduction of noise generated in the entire system having the configuration of fig. 1 is taken into consideration. In addition, the entire system can be operated efficiently and with low noise.

In embodiment 1 and embodiment 2, as shown in fig. 1, the rotating electrical machine control device 100 in the case of the system configuration in which 2 inverters, that is, the first inverter 20a and the second inverter 20b, and the first rotating electrical machine 1a and the second rotating electrical machine 1b are provided, but the number of inverters and the number of rotating electrical machines may be 3 or more, and the same effect can be obtained in this case.

Various exemplary embodiments and examples are described in the present application, but the various features, forms, and functions described in one or more embodiments are not limited to the application to the specific embodiments, and may be applied to the embodiments alone or in various combinations. Therefore, it is considered that numerous modifications not illustrated are also included in the technical scope disclosed in the present specification. For example, it is assumed that the case where at least 1 component is modified, added, or omitted, and the case where at least 1 component is extracted and combined with the components of other embodiments are included.

Description of the reference symbols

1a first rotating electric machine

1b second rotating electric machine

20a first inverter

20b second inverter

30a first inverter control unit

30b second inverter control unit

31a first PWM control section

31b second PWM control section

32a first PWM mode determining part

32b second PWM mode determining part

33a, 33b input/output state

33a1, 33b1 fundamental frequency

33a2, 33b2 output current

100 rotating electric machine control device

201 processor

202 storage means.

Claims

1. A rotating electric machine control device having a plurality of inverters controlled by PWM,

the relation between the input and output states of the inverter and the carrier frequency is set to 1 PWM mode,

has a combination pattern in which 2 or more PWM patterns are combined according to the region of the input/output state,

and a PWM pattern determining unit that switches the PWM pattern in accordance with the combination pattern that differs for each of the inverters.

2. The rotating electric machine control apparatus according to claim 1,

in the combined mode, the regions of the specific carrier frequency do not overlap among the plurality of inverters.

3. The rotating electric machine control apparatus according to claim 1 or 2,

the input-output state is a fundamental frequency of the inverter.

4. The rotating electric machine control apparatus according to claim 1 or 2,

the input-output state is an output current of the inverter.

5. The rotating electric machine control apparatus according to claim 1 or 2,

the PWM patterns combined as the combination pattern are synchronous PWM and asynchronous PWM.

6. The rotating electric machine control apparatus according to claim 1 or 2,

the PWM patterns combined as the combination pattern are random PWM and non-random PWM.

7. The rotating electric machine control apparatus according to any one of claims 1 to 6,

in the combined pattern obtained by combining the PWM patterns, a region of a carrier frequency for avoiding noise is commonly set in the plurality of inverters.

8. The rotating electric machine control apparatus according to any one of claims 1 to 6,

in the combined pattern obtained by combining the PWM patterns, a region of a carrier frequency for avoiding noise is set for each of the inverters.