JP2019062596A - Control system of rotary electric machine - Google Patents

Abstract

To provide a control system of a rotary electric machine, that is capable of rationally controlling a drive voltage even when atmospheric pressure is low.SOLUTION: There are provided a rotary electric machine (for example, a motor 14), a control unit (for example, an ECU 16 for HEV) configured to control the rotary electric machine by generating a drive voltage instruction value for commanding a drive voltage of the rotary electric machine, an atmospheric pressure detection unit (for example, an atmospheric pressure detection unit 21) configured to detect atmospheric pressure in the environment in which the rotary electric machine is placed, and a rotary electric machine state detection unit (for example, a temperature detection unit 22 or a rotation number detection unit 23) configured to detect a rotary electric machine state. The rotary electric machine state detected by the rotary electric machine state detection unit indicates at least one of temperature and the rotation number of the rotary electric machine, and the control unit generates the drive voltage instruction value within a range of a maximum voltage restriction by setting the maximum voltage restriction from the atmospheric pressure in the environment detected by the atmospheric pressure detection unit, and the rotary electric machine state detected by the rotary electric machine state detection unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control system of a rotating electrical machine.

  In Patent Document 1, control is performed to reduce the maximum value of the voltage supplied to the rotating electrical machine according to the decrease in atmospheric pressure, and set the maximum value of the voltage so that the amount of partial discharge in the insulator falls within the allowable range. The device is described.

Patent No. 4639916 gazette

  For example, when the rotary electric machine is driven at a high altitude, the atmospheric pressure is reduced. For this reason, in order for the amount of partial discharge in the insulator to be within the allowable range, it is necessary to lower the drive voltage. However, if the driving voltage is reduced according to the atmospheric pressure, for example, there is a problem that the performance of the rotating electrical machine is constantly reduced at high altitudes compared to low altitudes.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a control system of a rotating electrical machine capable of rationally controlling a drive voltage even if the air pressure is low.

  A control system of a rotating electrical machine according to a first aspect of the present invention includes a rotating electrical machine (for example, the motor 14 of the embodiment) and a control unit that generates a drive voltage instruction value for instructing a driving voltage of the rotating electrical machine and controls the rotating electrical machine For example, the HEV ECU 16 or the control unit 30, 40 according to the embodiment, an atmospheric pressure detection unit (for example, the atmospheric pressure detection unit 21 according to the embodiment) for detecting the atmospheric pressure of the environment in which the rotating electric machine is placed A state detection unit (for example, the temperature detection unit 22 or the rotation speed detection unit 23 of the embodiment) detecting a state, and the state of the rotation electric machine detected by the rotation electric machine state detection unit is the rotation electric machine At least one of the temperature and the number of revolutions, and the control unit is the largest of the atmospheric pressure of the environment detected by the atmospheric pressure detection unit and the state of the rotary electric machine detected by the rotary electric machine state detection unit. Set the voltage limit, and generates the drive voltage instruction value in the range of the maximum voltage limit.

  The control system of the rotating electrical machine according to the second invention is characterized in that the state of the rotating electrical machine detected by the rotating electrical machine state detecting unit is a temperature of the rotating electrical machine, and the rotating electrical machine state detecting unit is a temperature detecting unit. I assume.

  In the control system of the rotating electrical machine according to the third invention, the state of the rotating electrical machine detected by the rotating electrical machine state detecting unit is the temperature and the number of rotations of the rotating electrical machine, and the rotating electrical machine state detecting unit is a temperature detecting unit and a rotation It is characterized by being a number detection unit.

  In the control system of the rotating electrical machine according to the fourth aspect of the invention, the state of the rotating electrical machine detected by the rotating electrical machine state detecting unit is the number of rotations of the rotating electrical machine, and the rotating electrical machine state detecting unit is a rotational speed detecting unit It is characterized by

  In the control system of the rotating electrical machine according to the fifth aspect of the invention, the control unit is set such that the range in which the drive voltage is limited becomes smaller as the temperature of the rotating electrical machine decreases. It is characterized by

  In the control system of a rotary electric machine according to a sixth aspect of the invention, the control unit is set such that the range in which the drive voltage is limited becomes smaller as the rotation speed of the rotary electric machine increases. It is characterized by

  According to the first aspect of the invention, in addition to the atmospheric pressure of the environment in which the rotary electric machine is placed, the state of the rotary electric machine is detected to control the drive voltage of the rotary electric machine. It is possible to suppress a drop in the drive voltage.

  According to the second aspect of the invention, the temperature of the rotating electrical machine is detected in addition to the atmospheric pressure of the environment in which the rotating electrical machine is placed, and the drive voltage of the rotating electrical machine is controlled. It is possible to suppress a drop in the drive voltage.

  According to the third aspect of the invention, in addition to the atmospheric pressure of the environment in which the rotary electric machine is placed, the temperature and rotational speed of the rotary electric machine are detected to control the drive voltage of the rotary electric machine. Accordingly, an excessive decrease in drive voltage can be suppressed.

  According to the fourth aspect of the invention, in addition to the atmospheric pressure of the environment in which the rotary electric machine is placed, the rotational speed of the rotary electric machine is detected to control the drive voltage of the rotary electric machine. An excessive decrease in drive voltage can be suppressed.

  According to the fifth aspect of the invention, when the temperature of the rotating electrical machine is detected, the lower the temperature, the smaller the range in which the drive voltage is limited according to the reduction of the atmospheric pressure. A drop in voltage can be suppressed.

  According to the sixth aspect of the invention, when the rotational speed of the rotating electrical machine is detected, the higher the rotational speed, the smaller the range in which the drive voltage is limited according to the drop in the atmospheric pressure. An excessive decrease in drive voltage can be suppressed.

It is a figure showing the example of composition of the control system of rotation electrical machinery. About the control part in 1st Embodiment, (a) is a figure which shows a control flow, (b) is a figure which illustrates the corresponding | compatible relationship with air pressure and temperature, and a maximum voltage limit. (A)-(c) is a figure which illustrates the change of the voltage limit according to the change of temperature. About the control part in 2nd Embodiment, (a) is a figure which shows a control flow, (b) is a figure which illustrates the corresponding | compatible relationship with air pressure, temperature, and rotation speed, and a maximum voltage limit. It is a graph which illustrates change of output and current to number of rotations of a motor typically. It is a graph which illustrates the change of the maximum voltage with respect to an electric current typically. (A)-(c) is a figure which illustrates the change of the voltage limit according to the change of the electric current based on the change of rotation speed.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 is a view showing a configuration example of a control system of a rotating electrical machine according to the present embodiment. As shown in FIG. 1, the rotating electrical machine according to the present embodiment is a motor 14, and the control system of the rotating electrical machine according to the present embodiment is a motor control system 20. The motor control system 20 is used in a vehicle 10 including a battery 11, a booster 12, an inverter 13, a motor 14, and drive wheels 15.

  The vehicle 10 is, for example, a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or the like.

  The battery 11 is a rechargeable secondary battery, for example, a battery such as a nickel hydrogen battery or a lithium ion battery (BAT). The booster 12 boosts the output voltage V1 of the battery 11. The booster 12 is, for example, a voltage control unit (VCU). The booster 12 includes, for example, a DC-DC converter. The inverter 13 is, for example, a power drive unit (PDU). The inverter 13 converts the DC power output from the booster 12 into three-phase AC power and supplies it to the motor 14.

  The motor 14 is, for example, a motor (Motor; MOT) such as a three-phase alternating current brushless DC motor. As three phases, three phases of U phase, V phase, and W phase are mentioned, for example. The power output from the motor 14 is transmitted to the drive wheel 15 via, for example, a transmission (not shown).

  The motor 14 is exemplified by a motor including, for example, a stator having a coil and a rotor having a magnet. In the case of an inner rotor type motor, a rotor is provided inside a cylindrical stator. In the case of an outer rotor type motor, a stator is provided inside the rotor. In order to drive the motor 14, the power supplied from the inverter 13 is energized to the coil. Between the three-phase coils, between the conductors constituting each coil, etc. are electrically isolated.

  The vehicle 10 includes an electronic control unit (ECU) in order to control the motor 14 and the like. The electronic control unit may be mounted on the vehicle 10 as one unit, or two or more units may be mounted on the vehicle 10. In the case of the present embodiment, the vehicle 10 includes the HEV ECU 16 for controlling the motor 14 and the like, and the engine ECU 17 for controlling the engine.

  Since the motor 14 generates a potential difference at each part when it is energized, it needs insulation performance. In order to maintain the insulation performance, (1) securing the distance of the part where the potential difference occurs, (2) securing the thickness of the insulation material, (3) enhancing the insulation performance of the insulation material, (4 ) There are methods such as lowering the drive voltage of the motor. However, a design requiring excessive electrical insulation performance results in an increase in size of the motor, a decrease in performance, an increase in cost, and the like, so an appropriate design is required.

  Also, the insulation performance changes according to the use environment of the insulation material. For example, in Patent Document 1, the drive voltage of the motor is reduced according to the reduction of the atmospheric pressure. However, lowering the drive voltage causes the performance of the motor to be reduced and the power performance of the vehicle to be reduced. Therefore, the motor control system 20 detects not only the atmospheric pressure but also the temperature, the rotation speed, and the like of the motor 14 to control the drive voltage of the motor 14.

  The motor control system 20 according to the present embodiment includes a pressure detection unit 21 that detects the pressure of the environment in which the motor 14 is placed, and a motor state detection unit that detects the state of the motor 14. And at least one of the parts 23.

  When the vehicle 10 includes an engine including an internal combustion engine, the vehicle 10 may be provided with an atmospheric pressure sensor that measures the atmospheric pressure around the vehicle 10 in order to improve the combustion efficiency of the internal combustion engine. In this case, an air pressure sensor used for control of the engine can be used as the air pressure detection unit 21 of the motor control system 20. Therefore, information on the air pressure P detected by the air pressure detection unit 21 may be transmitted from the engine ECU 17 to the HEV ECU 16.

  Examples of the temperature detection unit 22 include a contact-type temperature sensor, a non-contact-type temperature sensor, and a temperature estimator. As a specific example of a temperature sensor, a thermistor, a thermocouple, an infrared sensor etc. are mentioned, for example. As a temperature estimator, a mechanism that estimates temperature change from a change in resistance between motor terminals, and a mechanism that estimates temperature change due to loss from input factors such as current and voltage input to the motor and output factors such as rotational speed Etc. The temperature of the motor 14 detected by the temperature detection unit 22 is, for example, the temperature of the coil or the insulating material.

  Examples of the rotation speed detection unit 23 include a magnetic rotation angle sensor such as a resolver, an optical rotation angle sensor such as a rotary encoder, a pulse sensor, and a rotation angle estimator. Examples of the rotation angle estimator include a mechanism that estimates the number of rotations based on a change in magnetic flux generated from a magnet of the rotor, and a mechanism that estimates the number of rotations based on the moving speed of the vehicle 10. The rotation speed of the motor 14 detected by the rotation speed detection unit 23 is, for example, the rotation speed of the rotor.

  The control unit for the drive voltage configured in the HEV ECU 16 is the air pressure P detected by the air pressure detection unit 21 and the temperature of the motor 14 detected by the motor state detection unit such as the temperature detection unit 22 or the rotation speed detection unit 23 A maximum voltage limit is set based on T, the number of revolutions R, etc., and a drive voltage instruction value is generated within the range of the maximum voltage limit. This voltage instruction value is transmitted to the booster 12 and used to control the output voltage V2 of the booster 12.

  Next, the control unit of the drive voltage in the first embodiment will be described. FIG. 2A is a diagram showing a control flow. FIG. 2 (b) illustrates the correspondence between the barometric pressure and temperature and the maximum voltage limit. FIGS. 3A to 3C are diagrams illustrating changes in voltage limit according to changes in temperature.

  The control unit 30 for drive voltage in the first embodiment includes a maximum voltage limit setting unit 31 and a drive voltage instruction unit 32. The maximum voltage limit setting unit 31 sets a maximum voltage limit from the atmospheric pressure P detected by the atmospheric pressure detection unit 21 and the temperature T of the motor 14 detected by the temperature detection unit 22. The drive voltage instruction unit 32 generates a voltage instruction value within the range of the maximum voltage limit set by the maximum voltage limit setting unit 31.

  The maximum voltage limit setting unit 31 calculates the maximum voltage limit from the pressure P and the temperature T. The correspondence (map) used for the calculation is not particularly limited, but may be a data structure such as a correspondence table or a function. The numerical values of the map shown in FIG. 2 (b) represent conceptual trends. The value of the atmospheric pressure is a relative value based on "1.0" (e.g., 1 atm [atm] = 101325 Pa) as the standard. The maximum voltage limit is, for example, a peak voltage (Vpk).

  The barometric pressure, temperature, and maximum voltage limit in FIG. 2B are displayed as discrete variables in increments of 0.1 atm, 50 ° C., and 20 V, as an example. The step value in the discrete variable is arbitrary, and the step value may be constant or indefinite. One or more of barometric pressure, temperature, or maximum voltage limit may be a continuous variable. If the air pressure or temperature is discrete, the accuracy of the air pressure or temperature in the air pressure detection unit 21 or the temperature detection unit 22 may be relaxed.

  The drive voltage indication unit 32 generates a voltage indication value lower than the maximum voltage limit set by the maximum voltage limit setting unit 31 in a situation where the maximum voltage limit is further lowered according to, for example, other required values of voltage limit. . That is, the lower one of the maximum voltage limit set by the maximum voltage limit setting unit 31 and the other required value of the voltage limit becomes the voltage indication value. "MIN" means to output any smaller value of the input. If another required value for voltage limit is not specified or is equal to or greater than the maximum voltage limit, the maximum voltage limit set by the maximum voltage limit setting unit 31 becomes the voltage indication value as it is.

  The other voltage limits are not particularly limited, but it is possible to consider, for example, the history of past voltage indication values, the usage condition of the motor, the situation around the vehicle, the situation on the road surface, and the like. In the case of simplifying the control, it is also possible to set the maximum voltage limit as a voltage indication value without setting other voltage limits.

  FIGS. 3 (a) to 3 (c) show the relationship between pressure and voltage at three temperatures, low temperature (e.g. 50 [deg.] C.), medium temperature (e.g. 100 [deg.] C.) and high temperature (e.g. 150 [deg.] C.). The hatched area is a range that can be adopted as a drive voltage, and satisfies the condition of less than the maximum voltage and less than the allowable voltage. The allowable voltage is a voltage set based on the insulation performance of the insulation material. Since the discharge is likely to occur when the air pressure is low, the allowable voltage changes so that the lower the air pressure, the lower the allowable voltage, according to the air pressure. The maximum voltage is an upper limit value determined by the specification of an inverter or the like that supplies electric power to the motor, and is determined without depending on the air pressure.

  When the temperature of the motor changes, for example, the change in insulation performance of the insulating material changes the allowable voltage. At high temperatures, the movement of charged particles such as electrons is promoted, the movement of atoms or molecules constituting the insulating material becomes active, and the viscosity is lowered, so that the insulation performance tends to be lowered. As long as the thermal degradation of the insulating material can be neglected, the change in the insulation performance is reversible, and when the temperature decreases, the insulation performance tends to recover. For this reason, the allowable voltage can be set to be high at low temperatures and to be low at high temperatures.

  As shown in FIG. 3C, when the temperature of the motor is high, the allowable voltage is low, so the allowable voltage is less than the maximum voltage, and the voltage restriction area is expanded. Here, the voltage limiting region is a range in which the driving voltage is more limited than the maximum voltage according to the decrease in the air pressure. As shown in FIGS. 3A and 3B, when the temperature of the motor decreases, the allowable voltage can be increased, so that the voltage restriction area can be reduced. Specifically, the range of atmospheric pressure in which the allowable voltage is lower than the maximum voltage is narrowed, and the voltage difference between the maximum voltage and the allowable voltage is also reduced.

  As an example compared with control part 30 of a 1st embodiment, the case where a maximum voltage limit is determined only by atmospheric pressure is mentioned. In this case, in order to ensure the insulation performance, it is necessary to adopt the same conditions as in the case of high temperature (for example, 150 ° C.). In this case, the decrease in power performance may be excessive due to the large voltage limit region. According to the control unit 30 of the first embodiment, the drive voltage can be controlled under the condition that the smaller the temperature of the motor is, the smaller the voltage limit area is. Therefore, the drive voltage is more properly controlled to reduce the power performance. It can be suppressed. For example, when the pressure is low and the temperature of the motor is low, the limitation of the drive voltage due to the drop of the pressure can be alleviated by the drop of the temperature.

  Next, the control unit of the drive voltage in the second embodiment will be described. FIG. 4A shows a control flow. FIG. 4 (b) is a diagram illustrating the correspondence between the barometric pressure, the temperature and the rotational speed, and the maximum voltage limit. FIG. 5 is a graph schematically illustrating changes in output and current with respect to the number of revolutions of the motor. FIG. 6 is a graph schematically illustrating the change of the maximum voltage with respect to the current. FIGS. 7 (a) to 7 (c) are diagrams illustrating changes in voltage limit according to changes in current based on changes in rotational speed.

  The control unit 40 for drive voltage in the second embodiment includes a maximum voltage limit setting unit 41 and a drive voltage instruction unit 42. Maximum voltage limit setting unit 41 is based on air pressure P detected by air pressure detection unit 21, temperature T of the motor detected by temperature detection unit 22, and rotation speed R of the motor detected by rotation speed detection unit 23. Set the maximum voltage limit. The drive voltage instruction unit 42 generates a voltage instruction value within the range of the maximum voltage limit set by the maximum voltage limit setting unit 41.

  The maximum voltage limit setting unit 41 calculates the maximum voltage limit from the pressure P, the temperature T, and the number of revolutions R. The correspondence (map) used for the calculation is not particularly limited, but may be a data structure such as a correspondence table or a function. Similar to the map shown in FIG. 2B, the numerical values of the map shown in FIG. 4B represent conceptual trends. The configuration for obtaining the maximum voltage limit from the atmospheric pressure P and the temperature T when the number of rotations R is specified can be the same as that of the control unit 30 of the first embodiment, and thus the redundant description will be omitted.

  The drive voltage indication unit 42 generates a voltage indication value lower than the maximum voltage limit in accordance with the other required values of the voltage limit. Further, when another required value of voltage limit is not specified or is equal to or greater than the maximum voltage limit, the maximum voltage limit set by the maximum voltage limit setting unit 41 becomes the voltage indication value as it is. The details of the drive voltage instruction unit 42 can be the same as those of the drive voltage instruction unit 32 according to the first embodiment, and thus redundant description will be omitted.

  The maximum voltage limit setting unit 41 may divide the control based on the change in the number of revolutions R into, for example, three stages of low speed, medium speed, and high speed. As a specific example, low speed is 0 rpm or more and less than 3000 rpm, medium speed is 3000 rpm or more and less than 6000 rpm, and high speed is 6000 rpm or more and 9000 rpm or less. The number of stages for dividing the number of revolutions R may be two or four or more. The width of each step of dividing the number of revolutions R may be equal or different. The accuracy of the rotation speed in the rotation speed detection unit 23 may be relaxed according to the width of the stage of dividing the rotation speed.

  When the number of revolutions R of the motor changes, for example, as shown in FIG. 5, the effective current supplied to the motor at a low speed tends to be large, the intermediate current at a medium speed, and the effective current at a high speed. When the effective current decreases, the surge voltage accompanying the on / off switching of the motor decreases. The maximum voltage considered in suppressing the discharge can be represented by the sum of a system voltage required to drive the motor and a transient surge voltage. Therefore, as shown in FIG. 6, when the current of the motor decreases, the maximum voltage can be set to decrease.

  7 (a) to 7 (c) show the relationship between pressure and voltage for three types of current, for example, current at low speed (for example, 500 A), current at medium speed (for example, 400 A), and current at high speed (for example, 300 A). Show. The region hatched with parallel hatching is a range that can be adopted as a drive voltage, as in FIGS. 3A to 3C, and satisfies the condition of less than the maximum voltage and less than the allowable voltage.

  As described above, when the number of revolutions of the motor changes, the maximum voltage changes. As shown in FIG. 7A, when the current is large, the maximum voltage is high, so the allowable voltage is less than the maximum voltage, and the voltage limit area is expanded. As shown in FIGS. 7 (b) and 7 (c), when the current decreases, the maximum voltage can be set low, so that the voltage restriction area can be reduced. Specifically, the range of atmospheric pressure in which the allowable voltage is lower than the maximum voltage is narrowed, and the voltage difference between the maximum voltage and the allowable voltage is also reduced.

  As an example compared with the control part 40 of 2nd Embodiment, the case where a maximum voltage limit is determined only by air pressure is mentioned. In this case, in order to ensure the insulation performance, it is necessary to adopt the same conditions as in the case where the number of rotations is low and the supplied current is large. In this case, the decrease in power performance may be excessive due to the large voltage limit region. According to the control unit 40 of the second embodiment, since the drive voltage can be controlled under the condition that the voltage restriction region is smaller as the number of revolutions of the motor is higher, the drive voltage is more properly controlled, and the power performance is degraded. Can be suppressed. For example, in the case where the rotation speed of the motor is high while the air pressure is low, the limitation of the drive voltage due to the decrease of the air pressure can be alleviated by the reduction of the current flow.

  The control unit 40 of the second embodiment sets the maximum voltage limit from the atmospheric pressure of the environment and the temperature and rotational speed of the motor. In this case, as described with reference to FIGS. 7A to 7C, the higher the rotational speed of the motor, the smaller the voltage limit area can be, and the use of FIGS. 3A to 3C. As described above, the lower the temperature of the motor, the smaller the voltage limit area can be.

  Although not particularly illustrated, as the control unit of the third embodiment, a configuration in which the maximum voltage limit is set from the atmospheric pressure of the environment and the rotational speed of the motor is also possible. As an example of the correspondence of the maximum voltage restriction to the barometric pressure and the number of rotations used in the control unit of the third embodiment, low temperature (for example, 50 ° C.) and medium temperature (for example, 100 ° C.) in the map shown in FIG. For example, the map is constructed by putting together the conditions of low speed and high temperature, medium speed and high temperature, and high speed and high temperature (for example, 150 ° C.). In this case, as described with reference to FIGS. 7A to 7C, the higher the number of revolutions of the motor, the smaller the voltage limit area can be.

  In addition, this invention is not limited to the above-mentioned embodiment, In the technical scope, various modifications are considered. For example, additions, replacements, omissions, and other changes of components in each embodiment are possible.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 battery 12 booster 13 inverter 14 motor (rotary electric machine) 15 drive wheel 16 HEV ECU 17 engine ECU 20 motor control system (rotary electric machine Control system), 21 ... air pressure detection unit, 22 ... temperature detection unit (rotary electric machine state detection unit), 23 ... rotation number detection unit (rotary electric machine state detection unit) 30, 40 ... control unit, 31, 41 ... maximum Voltage limit setting unit 32, 42: drive voltage instruction unit.

Claims (6)

With a rotating electrical machine,
A control unit that generates a drive voltage instruction value for instructing a drive voltage of the rotating electrical machine to control the rotating electrical machine;
An air pressure detection unit that detects the air pressure of the environment where the rotating electrical machine is placed;
A rotating electric machine state detection unit that detects the state of the rotating electric machine;
The state of the rotary electric machine detected by the rotary electric machine state detection unit is at least one of the temperature and the number of rotations of the rotary electric machine,
The control unit sets a maximum voltage limit based on the atmospheric pressure of the environment detected by the atmospheric pressure detection unit and the state of the rotary electric machine detected by the rotary electric machine state detection unit, and within the range of the maximum voltage limit The control system of the rotating electrical machine, wherein the drive voltage instruction value is generated.   The rotating electric machine according to claim 1, wherein the state of the rotating electric machine detected by the rotating electric machine state detecting unit is a temperature of the rotating electric machine, and the rotating electric machine state detecting unit is a temperature detecting unit. Control system.   The state of the rotating electric machine detected by the rotating electric machine state detecting unit is the temperature and the number of rotations of the rotating electric machine, and the rotating electric machine state detecting unit is a temperature detecting unit and a rotation number detecting unit. The control system of the rotary electric machine of claim 1.   The rotation according to claim 1, wherein the state of the rotating electric machine detected by the rotating electric machine state detecting unit is the number of rotations of the rotating electric machine, and the rotating electric machine state detecting unit is a rotation number detecting unit. Electric control system.   4. The control unit according to claim 2, wherein the control unit is set such that the range in which the drive voltage is limited becomes smaller as the temperature of the rotating electrical machine is lower, according to the decrease in the atmospheric pressure of the environment. The control system of the rotary electric machine described in.   4. The control unit according to claim 3, wherein the control unit is set such that the range in which the drive voltage is limited decreases as the rotation speed of the rotating electrical machine increases, as the atmospheric pressure of the environment decreases. The control system of the rotary electric machine according to 4.

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