JP2003299377A - Control device for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a rotating electric machine, which is capable of attaining cost reduction without causing errors in a PWM comparison signal even if a carrier frequency changes, and is applicable to vehicles. <P>SOLUTION: This control device for feeding power to the rotating electric machine by switching a power device comprises a controller for computing a current command value based on a torque command value and computing a carrier frequency command value based on a rotor frequency, a triangular wave generation circuit, a comparator for comparing the current command value to the value of an output triangular wave of the triangular wave generation circuit, and an inverter main circuit driven by an output signal of the comparator including the power device. The triangular wave generation circuit makes the amplitude of the triangular wave constant corresponding to the carrier frequency command value to change the carrier frequency of the output triangular wave by changing an up or down gradient. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a rotating electric machine, and more particularly to a controller for supplying power to the rotating electric machine by switching a power device.

[0002]

2. Description of the Related Art In Japanese Patent Laid-Open No. 2001-37248, a method for changing a switching carrier frequency in a rotating electric machine driven by PWM is realized by changing an amplitude of a triangular wave.

[0003]

In such a conventional technique, when the amplitude of the triangular wave is varied, the triangular wave changes almost vertically at the amplitude change point (carrier frequency change point) of the triangular wave. Since such an abrupt change does not result in an accurate triangular wave, there is a problem that the timing of each current phase shifts, an error occurs in the PWM comparison signal, and a shift in the correspondence to the command value There was a problem that noise was generated. The PWM comparison signal is generated by comparing the triangular wave and the current command value. If the amplitude of the triangular wave happens to change at the intersection of the triangular wave and the current command value, PW
Uncertain operations, switching chattering, spike noise, etc. occur in the M comparison signal, which causes an error. Furthermore, if the amplitude of the triangular wave is variable,
Since the control is performed with respect to the change in the current, the same calculation cycle as the carrier frequency (2 kHz to 10 kHz (500 uS to 1
00uS)), and an expensive controller having a high calculation speed capability was required.

When such a rotary electric machine is applied to a vehicle such as a hybrid vehicle, it has a starting acceleration, a deceleration stop, a general running, and a high speed running, as compared with the case of a normal rotary electric machine which is often driven at a constant rotation. Because there are various driving conditions,
A wide range of rotating electric machine frequency (f) is required. Here, f = rotation number × pole pair number. When the carrier frequency is constant, the carrier frequency must be set according to the high rotation speed. If the carrier frequency is not appropriate and is too low, the distortion of the sine wave to be controlled becomes large and the loss due to the distortion becomes large. Since the switching loss increases substantially in proportion to the carrier frequency, the switching loss increases when the carrier frequency is high. Here, switching loss = voltage × current × switching frequency × coefficient. Therefore, although it is necessary to change the carrier frequency frequently, the above-mentioned problems frequently occur in the conventional technology. In particular, when a large torque is required at low rotation at the time of starting, it is necessary to suppress torque fluctuations and switching loss due to errors in the PWM signal and noise.

Therefore, the present invention solves the above-mentioned problems, does not cause an error in the PWM comparison signal when the carrier frequency changes, and can be realized at low cost, which is suitable for application to a vehicle. The purpose is to provide a device.

[0006]

According to a first aspect of the present invention, in a control device for supplying electric power to a rotating electric machine by switching a power device, a current command value is calculated from a torque command value and a carrier frequency is calculated from a rotor frequency. A controller that calculates a command value, a triangular wave generation circuit, a comparator that compares the current command value with an output triangular wave value of the triangular wave generation circuit, and an inverter main circuit that includes the power device and that is driven by the output signal of the comparator. The triangular wave generating circuit changes the carrier frequency of the output triangular wave by changing the gradient of rising or falling while keeping the amplitude of the triangular wave constant according to the carrier frequency command value. .

According to a second aspect of the present invention, in the controller of the rotary electric machine according to the first aspect, the carrier frequency command value from the controller to the variable triangular wave generating circuit is synchronized with the output triangular wave to generate the triangular wave. The feature is that the operation is latched at the top of.

According to a third aspect of the present invention, in the controller of the rotating electric machine according to the first or second aspect of the invention, the current command value from the controller is limited within the amplitude of the output triangular wave, and the output triangular wave is further limited. It is characterized in that the operation is latched at the top of the triangular wave in synchronism with.

A fourth invention according to claim 4 is the first and second inventions.
Alternatively, in the control device for a rotating electric machine of the third invention, the variable triangular wave oscillation circuit generates the output triangular wave by an up-down counter and an upper limit and a lower limit count limiter, and the gradient of the output triangular wave is generated by a clock of the up-down counter. Characterized by changing the time.

According to a fifth aspect of the present invention, in the controller for the rotary electric machine according to any one of the first to fourth aspects, the rotary electric machine has a plurality of rotors, and the controller has the carrier frequency. It is characterized in that the command value is generated based on the highest frequency among the plurality of rotors.

According to a sixth aspect of the present invention, in the control device for the rotary electric machine according to any one of the first to fourth aspects, the rotary electric machine has a plurality of rotors, and the controller has the carrier frequency. The command value is generated based on an optimum frequency map that uniquely defines the carrier frequency command value for the frequencies of the plurality of rotors.

According to a seventh aspect of the present invention, in the control device for the rotary electric machine according to any one of the first to sixth aspects, the carrier frequency is corrected according to the current command value. .

According to a seventh aspect of the present invention, in the controller of the rotating electric machine according to any one of the first to seventh aspects, the carrier frequency is corrected according to the temperature of the inverter main circuit. And

[0014]

According to the first aspect of the present invention, by making the amplitude of the triangular wave constant, an error does not occur in the PWM comparison signal when the carrier frequency changes, and therefore the control suitable for application to the vehicle can be performed. Therefore, the controller does not need to perform the calculation in consideration of the amplitude of the triangular wave, the number of high-speed calculation programs is reduced, and thus the controller (CPU) can be inexpensive.

According to the second aspect of the invention, the changing point of the carrier frequency is the apex of the triangular wave, that is, the gradient of the triangular wave always changes with the same count value, so that the count value of the triangular wave suddenly changes when the carrier frequency changes. Since it does not reach the count value, there is no sudden change in the triangular wave, and there is no error in the PWM comparison signal.

According to the third invention, the current command value is limited to a value inside the amplitude of the triangular wave, and the current command value changes synchronously at the apex of the triangular wave outside the current command value.
Since the cross point of the triangular wave signal and the current command value signal does not overlap with the timing of the current command value output, the error and noise of the PWM comparison signal are eliminated.

In order to change the gradient of the triangular wave with a constant clock, the increment count value per clock must be changed. However, if there are many increments per clock, the triangular wave does not change linearly. Therefore, it is necessary to increase the number of bits more than necessary, and the circuit logic becomes complicated. According to the fourth invention, by making the clock time variable (changing the time per count), it is possible to minimize the counter with a fixed number of bits and simplify the circuit logic. Can be made at a very low price.

The fifth aspect of the invention is the simplest configuration for determining the reference for changing the carrier frequency when the rotating electric machine has a plurality of rotors.

According to the sixth aspect of the invention, even when the rotating electric machine has a plurality of rotors, it is possible to realize an optimum carrier frequency in consideration of the rotational speeds of all the rotors, and increase the rotating frequency of the rotating electric machine. By adopting a table structure in which the carrier frequencies also monotonically increase, the carrier frequencies do not overlap on the map, the map check becomes easy, and mapping mistakes can be prevented.

The switching loss of the power device of the inverter main circuit depends on the magnitude of the current. According to the seventh invention, according to the seventh invention, by appropriately controlling the output carrier frequency so as to lower the output carrier frequency when the control current is large, it is possible to reduce the switching loss when the control current is large.

According to the eighth aspect of the invention, when the temperature of the inverter main circuit rises, correction control for lowering the carrier frequency is performed to suppress the temperature rise of the inverter main circuit.
Failure due to temperature rise can be prevented.

[0022]

1 is a sectional view showing an example of the configuration of a rotating electric machine that can be driven by the inverter system of the present invention. The rotating electric machine 100 is concentrically mounted on the center axis C of the inner rotor shaft 9 (which is also the center axis of the rotating electric machine) from the inner side to the inner rotor 7, the stator 1, and the outer rotor shaft. 4 has a multi-rotor structure in which the outer rotor 8 attached to the rotor 4 is arranged in this order, and the stator 1 located between the two rotors of the outer rotor 8 and the inner rotor 7 has a stator core 2 and the stator core 2 in the axial direction. And a bracket 5 which is sandwiched and supported from both sides. The bolt 6 penetrates the holes provided in the bracket 5 and the stator core 2 and fixes these members to form the stator 1. The stator core 2 is divided into a plurality of stator pieces arranged in the circumferential direction, a coil is wound around each stator piece, and each stator piece is formed by laminating a plurality of stator steel plates. A magnet is attached to each of the inner rotor 7 and the outer rotor 8. Hereinafter, the present invention will be described by taking as an example a rotary electric machine in which two such rotors are coaxially arranged and driven by a composite current.

FIG. 2 is a block diagram showing the configuration of an embodiment of a controller for a rotary electric machine according to the present invention. The controller 20 includes a controller 21, a carrier frequency command value latch 22 connected to the controller 21, an oscillator 23 connected to the carrier frequency command value latch 22, and a carrier frequency command value connected to the oscillator 23. A variable triangular wave oscillator circuit 24 connected to the latch 22, limiters 25a to 25f connected to the controller 21, respectively.
The current command value latches 26a to 26f and the current command value latches 26a to 26f, which are respectively connected to the limiters 25a to 25f, and are connected to the carrier frequency command value latch 22.
To the variable triangular wave oscillation circuit 24 and the controller 2 and the comparators 27a to 27f.
1 connected to the temperature detector 28, an inverter main circuit 29 connected to the temperature detector 28 and the comparators 27a to 27f, and a current sensor connected between the inverter main circuit 29 and the stator coil of the rotating electric machine. 30a-30
f and. The controller 21 uses the same speed sensor 10 for the inner rotor of the rotary electric machine 100 as that shown in FIG.
1 and a speed sensor 102 of the outer rotor.

The controller 21 receives the inner rotor torque command value and the outer rotor torque command value, generates a current command value for each phase by normal vector control, and supplies the current command values to the limiters 25a to 25f. Controller 21
Further receives speed signals of the respective rotors from the inner rotor speed sensor 31 and the outer rotor speed sensor 32, receives current signals relating to the currents supplied to the respective stator coils from the current sensors 30a to 30f, and detects the temperature detector 28. Receives the temperature of the inverter main circuit 29, generates a carrier frequency command value, and supplies it to the carrier frequency command value latch 22.

The limiters 25a to 25f limit the current command value from the controller 21 to a value inside the amplitude of the triangular wave and supply it to the current command value latches 26a to 26f. The current command value latches 26a to 26f latch (hold) the limited current command value with a latch signal from the variable triangular wave oscillation circuit 24, and output it to the comparators 27a to 27f. The comparators 27a to 27f include a triangular wave signal from the variable triangular wave oscillator circuit 24 and a current command value latch 26a.
The current command value signals from 26f to 26f are compared, a switching signal for the inverter main circuit 29 is generated, and the switching signal is supplied to the inverter main circuit 29. The inverter main circuit 29 controls the switching of the current flowing through each phase of the motor 100 by the switching signals from the comparators 27a to 27f.

The carrier frequency command value latch 22 latches (holds) the carrier frequency command value from the controller 21 by a latch signal from the variable triangular wave oscillation circuit 24.
And outputs it to the transmitter 23. In the transmitter 23, the controller 21 outputs a pulse signal of the command frequency to the variable triangular wave transmission circuit 24 according to the carrier frequency command value.
The variable triangular wave oscillation circuit 24 outputs a triangular wave signal to the comparators 27a to 27f by the pulse signal from the oscillator 23, and outputs a latch signal to the current command value latches 26a to 26f and the carrier frequency command value latch 22.

FIG. 3 is a block diagram of the variable triangular wave oscillator circuit 24 of FIG. Variable triangular wave 24 is UP / DOWN
It comprises a counter 31, an ascending count limit value comparator 32 and a descending count limit value comparator 33 connected to the UP / DOWN counter 31, and a flip-flop 34 connected to these comparators. The UP / DOWN counter 31 generates a count value by the UP / DOWN switching signal from the flip-flop 34 and the pulse signal from the oscillator 23. The rising count limit value comparator 32 uses the UP / DOW
When the count value of the N counter 31 reaches the upper limit, it is output to the flip-flop 34, the flip-flop 34 is switched, and the UP / DOWN switching signal is switched to DOWN. The falling count limit value comparator 33 is
When the count value of the / DOWN counter 31 reaches the lower limit, the count value is output to the flip-flop 34, and the flip-flop 34
To switch the UP / DOWN switching signal to UP. With this operation, the UP / DOWN signal periodically repeats UP and DOWN.
The count value output by the WN counter 31 becomes a triangular wave. Further, the falling counter limit value comparator 33
Produces a latch signal at the lower vertex of the triangle wave. The rising counter limit value comparator 32 may generate the latch signal at the upper vertex of the triangular wave.

FIG. 4 is a timing chart of such a triangular wave signal and a latch signal. Since this triangular wave signal is generated by the counter, it does not actually change in a straight line but changes in a stepwise manner. In the present invention, the amplitude of the triangular wave signal is not changed, and the count value during UP and DOWN is held constant by the comparators 32 and 33, so the width of each count in the amplitude direction is constant. The gradient of the triangular wave signal is changed by changing the pulse width t (clock time) of the pulse signal from the oscillator 23.

FIG. 5 is a block diagram of a portion of the controller 21 of FIG. 2 that generates a carrier frequency command value. This part includes a carrier frequency command value generation unit 41,
A first correction unit 42 that corrects the carrier frequency by the target current, a second correction unit 43 that corrects the carrier frequency by the inverter main circuit temperature, and a carrier frequency command value limiter 44 are connected in series. The order of the first correction unit 42 and the second correction unit 43 may be exchanged. The operation of this part will be described in more detail later with reference to the block diagrams of FIGS. 6-9 and the flow charts of FIGS.

FIG. 6 is a block diagram showing the details of an example of the carrier frequency command value generator 41 in FIG. This part is composed of an inner rotor frequency calculation unit 51, an outer rotor frequency calculation unit 52, a comparator 53 connected to these calculation units, and a coefficient multiplication unit 54 connected to the comparator 53. In a rotary electric machine having two rotors, it becomes a problem which carrier frequency is changed based on the rotation speed of which rotor. In this example, the higher frequency = rotation number × pole pair number is selected, and the carrier frequency command value is generated based on this. The inner rotor speed is Ni, the outer rotor speed is No, the inner rotor pole pair number is Pi, and the outer rotor pole pair number is Po.
In the inner rotor frequency calculation unit 51,
Pi is calculated, the inner rotor frequency Fi is output, the outer rotor frequency calculation unit 52 calculates No × Po, and the outer rotor frequency Fo is output. Comparator 53
Then, the higher one of the inner rotor frequency Fi and the outer rotor frequency Fo is selected and output as F. The coefficient multiplying unit 54 multiplies F from the comparator 53 by the carrier frequency coefficient Kf and outputs the carrier frequency command value Tf.

FIG. 7 is a block diagram showing details of another example of the carrier frequency command value generator 41 in FIG.
This part is composed of an inner rotor frequency calculation unit 51 and an outer rotor frequency calculation unit 52 similar to the example of FIG. 6, and an optimum frequency map 55 connected to these calculation units. In this example, the carrier frequency command value is determined using an optimum frequency map formed so that the carrier frequency command value is uniquely obtained from both the frequencies of the inner rotor and the outer rotor. Here, the map is formed so that the carrier frequency command value monotonically increases with respect to the rotor frequency. By doing so, the individual carrier frequencies do not overlap on the map, so that the map can be checked easily and mapping mistakes can be eliminated. Similarly to the example of FIG. 6, the frequencies Fi and Fo of each rotor calculated by the inner rotor frequency calculation unit 51 and the outer rotor frequency calculation unit 52 are input to the optimum frequency map 55,
The carrier frequency command value Tf corresponding to these frequencies is determined. Whether the carrier frequency command value generated by the carrier frequency command value generation unit 41 shown in FIGS. 6 and 7 is used as it is or a carrier frequency command value generated by another method is used, the carrier frequency is set to a triangular wave. It is possible to sufficiently obtain the effect of the present invention that the occurrence of an error in the PWM comparison signal caused by making the gradient variable by changing it is eliminated.

FIG. 8 is a block diagram showing in detail the first correction section 42 in FIG. The first correction unit is configured by connecting an adder 61, a current proportional function map 62, and a multiplier 63 in series. The other part of the controller 21 which receives the inner rotor torque command value and the outer rotor command value is the inner rotor target current T which is the control current value.
Ii and the outer rotor target current TIo are generated, and these are input to the adder 61. The adder 61 adds these target currents and outputs a combined target current TI. The current proportional function map 62 is the combined target current T from the adder 61.
The correction value Ki for I is uniquely determined and output. In the multiplier 63, the carrier frequency command value from the carrier frequency command value generation unit 41 (or from the second correction unit 43) is multiplied by the correction value Ki, and the corrected carrier frequency command value is output. The first correction unit 42 corrects the output carrier frequency to be low when the control current value is large. Since the switching loss of the power device of the inverter main circuit depends on the magnitude of the current, by doing this,
It is possible to reduce switching loss when the control current value is large.

FIG. 9 is a block diagram showing in detail the second correction section 43 in FIG. The second correction unit includes a temperature function map 64 and a multiplier 65 connected to the temperature function map 64. The temperature function map 64 corresponds to the temperature detection unit 28 of FIG.
The correction coefficient Kp is uniquely determined and output for the temperature of the inverter main circuit 29 received from. In the multiplier 65 (from the carrier frequency command value generation unit 41 (or the first
The correction value Kp is added to the carrier frequency command value (from the correction unit 42).
And the corrected carrier frequency command value is output. The second correction unit 43 corrects the carrier frequency to be lowered when the inverter main circuit temperature rises. By doing so, it is possible to suppress the temperature rise of the inverter main circuit and reduce the failures due to the temperature rise.

FIG. 10 is a flow chart for explaining the operation of the part for generating the carrier frequency command value in FIG.
As the carrier frequency command value generation unit 41, the example of FIG. 6 is used. The operation starts in step S101. In step S102, the carrier frequency command value generation unit 41 sets the inner rotor rotation speed Ni to the inner rotor speed sensor 31.
From the outer rotor speed sensor 32, the first correction unit 41 receives the inner rotor target current TIi and the outer rotor target current TIo from other parts of the controller 21, and the second correction unit 43 receives The main circuit temperature TP is received from the temperature detection sensor 28.

In step S103, the inner rotor frequency calculation unit 51 and the outer rotor frequency calculation unit 52 of the carrier frequency command value generation unit 41 multiply the number of rotations of each rotor by the number of pole pairs to determine the inner rotor frequency Fi and the outer rotor frequency. Calculate Fo. Step S104
Then, the comparator 53 of the carrier frequency command value generation unit 41
Compare Fi and Fo. When Fi is large, in step S105, the coefficient multiplication unit 54 of the carrier frequency command value generation unit 41 multiplies Fi by the carrier frequency coefficient Kf to generate the carrier frequency command value Tf. If Fo is large,
In step S106, the carrier frequency command value generation unit 41
The coefficient multiplying unit 54 of F multiplies Fo by the carrier frequency coefficient Kf to generate the carrier frequency command value Tf.

In step S107, the adder 61 of the first correction section 41 adds the inner rotor target current TIi and the outer rotor target current TIo to generate a combined target current TI. In step S108, the correction coefficient Ki corresponding to the combined target current TI is determined in the current proportional function map 62 of the first correction unit 41. In step S109, the multiplier 63 of the first correction unit 41 causes the multiplier 63 in step S106.
The correction coefficient Ki is added to the carrier frequency command value Tf generated in
And a corrected carrier frequency command value Tf is output.

In step S110, the inverter main circuit temperature Tp is set in the temperature function map 64 of the second correction section 42.
The correction coefficient Kp corresponding to is determined. Step S111
In, the multiplier 65 of the second correction unit 42 multiplies the corrected carrier frequency command value Tf from the first correction unit 41 by the correction coefficient Kp, and outputs the corrected carrier frequency command value Tf.

In step S112, the carrier frequency command value limiter 44 determines whether the carrier frequency command value Tf is less than the carrier frequency upper limit value Kf1. When Tf is Kf1 or more, step S114
And Kf1 is set as the carrier frequency command value Tf, and step S
This carrier frequency command value Tf is output at 116, and the operation ends at step S117. If Tf is less than Kf1, it is determined in step S113 whether the carrier frequency command value Tf is greater than the carrier frequency lower limit value Kf2. If Tf is less than or equal to Kf2, K in step S115
Let f2 be the carrier frequency command value Tf, and step S11
This carrier frequency command value Tf is output at 6 and the operation ends at step S117. If Tf is larger than Kf2, this Tf is output as the carrier frequency command value in step S116, and the operation ends in step S117.

FIG. 11 is a flow chart for explaining the operation of the part for generating the carrier frequency command value of FIG. 5 similar to FIG. 10, but in that the example of FIG. 7 is used as the carrier frequency command value generating section 41. Only different. Steps S201, S202 and S203 are the same as steps S101, S102 and S103 of FIG. 10, respectively. In step S204, the carrier frequency command value Tf corresponding to the inner rotor frequency Fi and the outer rotor frequency Fo is determined in the optimum frequency map 55 of the carrier frequency command value generation unit 41. Subsequent steps S205, S206, S207, S208, S
209, S210, S211, S212, S213, S
214 and S215 are steps S107 and S of FIG.
108, S109, S110, S111, S112, S
113, S114, S115, S116, and S117, respectively.

Although the present invention has been described hereinabove with respect to a rotating electric machine in which two rotors and one stator are coaxially arranged, a rotating electric machine having one rotor and one stator, or two rotors and two rotors are provided. Needless to say, the present invention can be applied to a rotary electric machine having any other structure, such as a rotary electric machine included therein.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the configuration of a rotary electric machine that can be driven by a control device for a rotary electric machine according to the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of a controller for a rotary electric machine according to the present invention.

FIG. 3 is a block diagram of a variable triangular wave oscillator circuit 24 in FIG.

FIG. 4 is a timing chart of a triangular wave signal and a latch signal.

5 is a block diagram of a portion of the controller 21 of FIG. 2 that generates a carrier frequency command value.

FIG. 6 is a carrier frequency command value generation unit 4 in FIG.
FIG. 3 is a block diagram showing details of an example of No. 1.

FIG. 7 is a carrier frequency command value generation unit 4 in FIG.
It is a block diagram which shows the detail of the other example of 1.

8 is a block diagram showing in detail a first correction section 42 in FIG.

9 is a block diagram showing in detail a second correction section 43 in FIG.

FIG. 10 is a flowchart illustrating an operation of a part that generates a carrier frequency command value in FIG.

FIG. 11 is a flowchart illustrating another example of the operation of the part that generates the carrier frequency command value in FIG. 5.

[Explanation of symbols]

1 stator 2 Stator core 4 Outer rotor shaft 5 bracket 6 bolts 7 Inner rotor 8 outer rotor 9 Inner rotor shaft 20 Control device 21 Controller 22 Carrier frequency command value latch 23 transmitter 24 Variable triangular wave oscillator 25a-25f limiter 26a to 26f current command value latch 27a-27f Comparator 28 Temperature detector 29 Inverter main circuit 30a to 30f current sensor 31 UP / DOWN counter 32 Rise count limit value comparator 33 Down counter limit value comparator 34 flip-flops 41 Carrier frequency command value generator 42 First Correction Unit 43 Second correction unit 44 Carrier frequency command value limiter 51 Inner rotor frequency calculator 52 Outer rotor frequency calculator 53 comparator 54 coefficient multiplication unit 55 Optimal frequency map 61 adder 62 Current proportional function map 63 multiplier 64 Temperature function map 65 multiplier 100 rotating electric machine

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H007 AA06 BB06 DA03 DB13 DC02                       DC08 EA14                 5H560 AA08 BB05 BB17 EB01 JJ06                       JJ16 TT07 TT15 XA12                 5H572 AA02 BB03 DD09 DD10 HB07                       HB09 JJ03 JJ12 JJ13 JJ14                       JJ19 JJ28 JJ30 LL01 LL14                       LL22 LL35

Claims (8)

[Claims] 1. A controller for feeding power to a rotary electric machine by switching a power device, a controller for calculating a current command value from a torque command value and a carrier frequency command value from a rotor frequency, a triangular wave generating circuit, and the current. A comparator for comparing a command value with a value of an output triangular wave of the triangular wave generating circuit, and an inverter main circuit that includes the power device and is driven by an output signal of the comparator, wherein the triangular wave generating circuit has a carrier frequency of the output triangular wave. Is controlled by changing the gradient of rising or falling while keeping the amplitude of the triangular wave constant according to the carrier frequency command value. 2. The rotating electric machine control device according to claim 1, wherein a carrier frequency command value from the controller to the variable triangular wave generating circuit is operationally latched at the apex of the triangular wave in synchronization with the output triangular wave. A control device for a rotary electric machine, characterized by: 3. The rotating electric machine control device according to claim 1, wherein the current command value from the controller is limited to within the amplitude of the output triangular wave, and the apex of the triangular wave is synchronized with the output triangular wave. A control device for a rotating electric machine, characterized in that the operation is sometimes latched. 4. The control device for a rotating electric machine according to claim 1, 2 or 3, wherein the variable triangular wave oscillator circuit generates the output triangular wave by an up-down counter and an upper limit and a lower limit count limiter, and the output triangular wave is generated. Is changed by changing the clock time of the up / down counter. 5. The rotating electric machine control device according to claim 1, wherein the rotating electric machine has a plurality of rotors, and the controller sets the carrier frequency command value to the plurality of rotors. A control device for a rotating electric machine, which is generated based on the highest frequency of the rotor. 6. The control device for a rotary electric machine according to claim 1, wherein the rotary electric machine has a plurality of rotors, and the controller sets the carrier frequency command value to the plurality of rotors. A control device for a rotating electric machine, characterized in that the carrier frequency command value is generated based on an optimal frequency map that uniquely defines the frequency of the rotor. 7. The control device for a rotary electric machine according to claim 1, wherein the carrier frequency is corrected according to the current command value. 8. The control device for a rotary electric machine according to claim 1, wherein the carrier frequency is corrected according to the temperature of the inverter main circuit. .