JP2021151080A - Rotary machine control device - Google Patents

Abstract

To provide a rotary machine control device that can control the temperature of a rotating machine to match a temperature limit even when the characteristics of the rotating machine change, and can appropriately protect the temperature of the rotating machine from overheating so as not to reduce the output of the rotating machine.SOLUTION: A rotary machine control device includes a temperature detector 3 that detects the temperature of the field winding, which is a temperature-protected part of a rotating machine 1, and a field winding temperature protection unit 24 that controls the temperature of the field winding below a limit temperature, and the field winding temperature protection unit 24 limits a voltage command of the field winding power converter 7 by a voltage command limit value based on the temperature of the field winding.SELECTED DRAWING: Figure 2

Description

The present application relates to a rotary machine control device that protects the rotary machine from heat.

In Patent Document 1, the maximum exciting current based on the maximum exciting current limiting curve prepared in advance is generated according to the temperature of the vehicle generator motor, and the exciting current is limited by the maximum exciting current to protect the vehicle generator motor from overheating. I am trying to. In Patent Document 2, the maximum power dissipation amount is calculated based on the difference from the maximum operating temperature calculated by feeding back the operating temperature of the motor, and a torque command is generated based on the maximum power dissipation amount. It protects the motor from overheating.

FR2938987-A1 Japanese Patent Application Laid-Open No. 2008-141941

However, in Patent Document 1, since the maximum exciting current limit curve is prepared in advance, the temperature rise rate of the vehicle generator motor is higher than expected under operating conditions different from the conditions assumed in the limit curve. May also be better. In that case, the expected overheat protection cannot be achieved. In addition, when trying to realize the expected overheat protection including variation in specifications or other conditions, if the maximum exciting current limit curve with a safety factor is set in consideration of them, the limit is originally unnecessary. However, there is a possibility that the performance will be reduced due to restrictions.
In Patent Document 2, since the torque command is generated from the maximum power dissipation amount obtained by feeding back the operating temperature of the motor, if the relationship between torque and power deviates from the assumption, the torque and the calorific value are generated. Since there is no proportional relationship, the torque is limited, but the operating temperature does not drop as expected. That is, if the motor characteristics change due to temperature or magnetic flux, the torque limit value is converted to a value larger than the value assumed when converting to voltage, and overheat protection of the motor may not be possible.

This application has been made to solve the above-mentioned problems, and even when the characteristics of the rotating machine change, the temperature of the rotating machine is controlled so as to match the temperature limit, and the output of the rotating machine is reduced. The purpose is to obtain a rotating machine control device that can be appropriately protected from overheating so as not to cause it.

The rotary machine control device disclosed in the present application is a rotary machine control device that controls a power converter that applies a voltage to the windings of the rotary machine based on a voltage command, and is a temperature of a temperature-protected portion of the rotary machine. It is equipped with a temperature detector that detects the temperature and a temperature protection unit that controls the temperature of the temperature protection target part below the limit temperature, and the temperature protection unit limits the voltage command by the voltage command limit value based on the temperature of the temperature protection target part. do.

According to the rotary machine control device of the present application, even when the rotary machine characteristics change, it is possible to appropriately protect the rotary machine output from overheating so as not to decrease the rotary machine output.

It is a block diagram which shows the hardware composition of the rotary machine control device which concerns on Embodiment 1. FIG. It is a block diagram which shows an example of the rotary machine control apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows the stator winding current control part in the rotary machine control apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows the field winding current control part in the rotary machine control apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows the current command generation part in the rotary machine control apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows the field winding temperature protection part in the rotary machine control device which concerns on Embodiment 1. FIG. It is a figure which shows the control result by the rotary machine control device which concerns on Embodiment 1. FIG. It is a figure which shows the protection operation in the rotary machine control device which concerns on Embodiment 1. FIG. It is a block diagram which shows the magnet temperature protection part which is the replacement example of the field winding temperature protection part in the rotary machine control device which concerns on Embodiment 1. FIG. It is a block diagram which shows the rotary machine control device which concerns on Embodiment 2. It is a block diagram which shows the rotary machine control device which concerns on Embodiment 3. It is a block diagram which shows Embodiment 4 which applied the rotary machine control device which concerns on embodiment to a vehicle generator motor.

Hereinafter, the rotary machine control device according to the embodiment will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals.

Embodiment 1.
FIG. 1 is a diagram showing a hardware configuration of the rotary machine control device according to the first embodiment, and shows the entire system including the rotary machine to be controlled. The rotary machine control device 1000 drives and controls a rotary machine 1, for example, an AC rotary machine, and the rotary machine 1 is via a stator winding power converter 6 and a field winding power converter 7, which will be described later, respectively. It is connected to each winding of. Further, the rotary machine control device 1000 is connected to a position detector 2 and a temperature detector 3 provided in the rotary machine 1.

Further, the rotating machine control device 1000 is connected to a current detector 4 and a current detector 5 which are connected in series between the stator winding power converter 6, the field winding power converter 7 and the rotating machine 1, respectively. ing. In FIG. 1, the rotary machine control device 1000 includes a processor 10 and a storage device 11.
Although not shown, the storage device 11 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Further, the storage device 11 may be provided with an auxiliary storage device such as a hard disk instead of the non-volatile auxiliary storage device.
The processor 10 executes the program input from the storage device 11. Since the storage device 11 includes an auxiliary storage device and a volatile storage device, a program is input to the processor 10 from the auxiliary storage device via the volatile storage device. Further, the processor 10 may output data such as a calculation result to the volatile storage device of the storage device 11, or may store the data in the auxiliary storage device via the volatile storage device.

The rotor 1 has a permanent magnet and a field winding on the rotor, and a three-phase stator winding on the stator. The rotary machine 1 may or may not have a permanent magnet, or may be a rotary machine having two or more stator windings having three or more phases in the stator.
The position detector 2 is installed on the rotating shaft of the rotating machine 1 and detects the angle θ of the rotor. The position detector 2 may have a function as a position estimator for estimating the angle θ of the rotor. Here, these are collectively referred to as a position detector.
The temperature detector 3 is, for example, a temperature sensor such as a resistance temperature detector, a thermocouple, or a thermistor, and detects the field winding temperature tf. The temperature detector 3 may have a function as a temperature estimator for estimating the temperature of the field winding instead of the temperature sensor. Here, these are collectively referred to as a temperature detector. Further, this temperature detector detects the temperature of the part subject to temperature protection, and not only the temperature of the field winding, but also the temperature or power conversion of the parts constituting the rotating machine such as the stator winding and the magnet. It may be intended for the temperature of a vessel or the like.
The current detector 4 detects the stator winding currents iu, iv, and iwa, and the current detector 5 detects the field winding current if. In addition, instead of a part or all of the current detectors 4 and 5, those having a function as a current estimator for estimating the currents iu, iv, iw of the stator winding and the field winding current if. It may be. Here, these are collectively referred to as a current detector.
The stator winding power converter 6 uses a known method such as PWM (pulse width modulation) or PAM (pulse amplitude modulation) to apply a voltage corresponding to the command values vu *, vv *, vw * of the three-phase voltage. Generate. It also detects the DC link voltage VDC used for power conversion.
The field winding power converter 7 generates a voltage corresponding to the field winding voltage command vf * by using a known method such as PWM or PAM. It also detects the DC link voltage VDCf used for power conversion.

FIG. 2 is a block diagram showing the configuration of the rotary machine control device 1000 according to the first embodiment.
The rotating machine control device in the system of FIG. 2 includes a differentiator 20, a stator winding current control unit 21, a field winding current control unit 22, a current command generation unit 23, and a field winding temperature protection unit. It has 24 and. The field winding temperature protection unit 24 controls the temperature of the field winding, which is a temperature-protected portion, to a temperature limit temperature or less. Here, each winding has one current control unit, but de-interference processing may be performed by a known method in consideration of interference between windings.

The differentiator 20 differentiates the angle θ of the rotor and calculates the velocity ω of the rotor.
The stator winding current control unit 21 issues stator winding voltage commands vu *, vv *, vw * so that the stator winding current id and iq match the stator winding current commands id * and iq *. Calculate.
The field winding current control unit 22 calculates the field winding voltage command vf * so that the field winding current if matches the field winding current command if *.
The current command generation unit 23 calculates the stator winding current commands id * and iq * and the field winding current command if * based on at least the torque command T * and the rotor speed ω.
The field winding temperature protection unit 24 calculates the field winding voltage limit value vflim, which is a voltage command limit value, based on the field winding temperature tf and the limit field winding temperature tfmax.

FIG. 3 is a diagram of the stator winding current control unit 21 in the rotary machine control device according to the first embodiment.
The stator winding current control unit 21 includes an addition / subtractor 30, a PI controller 31, a dq / uvw coordinate converter 32, an uvw / dq coordinate converter 33, and a voltage limiter 34.
The uvw / dq coordinate converter 33 uses a well-known coordinate conversion method to convert the currents iu, iv, and iw of the three-phase current detection values detected by the current detector 4 into the d-axis current detection values id and q-axis. Converts to the current detection value of the current detection value iq.

The stator winding current control unit 21 is a stator winding of the stator winding current commands id * and iq * output from the current command generation unit 23 and the stator winding current id and iq which are current detection values. Based on the line current deviations id * -id and iq * -iq, PI control is performed by the PI controller 31 to generate stator winding voltage command values vd ** and vq **. Calculation examples in the PI controller are shown in equations (1) and (2). Here, Kpd and Kid, and Kpq and Kiq are stator winding proportional gain and integral gain, respectively. Further, s is a differential operator of the Laplace transform, and the same applies to the following equations. Here, vd ** and vq ** are calculated by feedback control, but may be calculated by feedforward control.

Although not shown, well-known decoupling control may be performed after the stator winding voltage command values vd ** and vq ** are generated. Further, the stator winding current control unit 21 may calculate the stator winding voltage command values vd ** and vq ** based on the stator winding current commands id * and iq * and the voltage equation. good.

When the amplitudes of the stator winding voltage command values vd ** and vq ** are larger than the stator winding voltage limit value vdqlim, the voltage limiter 34 is fixed so as to be equal to or less than the stator winding voltage limit value vdqlim. Calculate the child winding voltage commands vd * and vq *.
Although not shown, when the voltage amplitude of the stator winding voltage command values vd ** and vq ** is limited by the voltage limiter 34, the integrator of the PI controller 31 is subjected to anti-windup processing. You may. Further, the voltage limiter 34 limits the stator winding voltage command values vd ** and vq **, but limits the DC link voltage VDC instead of the stator winding voltage command values vd ** and vq **. You may.
The dq / uvw coordinate converter 32 converts the stator winding voltage commands vd * and vq * into the command values vu *, vv *, vw * of the three-phase voltage by using a well-known coordinate conversion method.

FIG. 4 is a diagram of the field winding current control unit 22 in the rotary machine control device according to the first embodiment.
The field winding current control unit 22 includes an addition / subtractor 40, a PI controller 41, and a voltage limiter 42.

The field winding current control unit 22 has a field winding current deviation if * between the field winding current command if * output from the current command generation unit 23 and the field winding current if which is the current detection value. Based on −if, PI control is performed by the PI controller 41 to generate the field winding voltage command value vf **. An example of calculation in the PI controller is shown in Equation (3). Here, Kpf and Kif are field winding proportional gain and integral gain, respectively.

Although not shown, well-known decoupling control may be performed after the field winding voltage command value vf ** is generated. Further, the field winding current control unit 22 may calculate the field winding voltage command value vf ** based on the field winding current command if * and the voltage equation.
When the amplitude of the field winding voltage command value vf ** is larger than the field winding voltage limit value vflim, the voltage limiter 42 sets the field winding voltage to be equal to or less than the value of the field winding voltage limit value vflim. Calculate the command vf *.
Although not shown, when the voltage amplitude of the field winding voltage command value vf ** is limited by the voltage limiter 42, the integrator of the PI controller 41 may be subjected to anti-windup processing. Further, although the voltage limiter 42 limits the field winding voltage command value vf **, the DC link voltage VDCf may be limited instead of the field winding voltage command value vf **.

FIG. 5 is a diagram of a current command generation unit 23 in the rotary machine control device according to the first embodiment.
The current command generation unit 23 includes a stator winding current command calculation unit 50 and a field winding current command calculation unit 51.

The stator winding current command calculation unit 50 corresponds to the torque command T * and the field winding voltage limit value vflim output from the field winding temperature protection unit 24, and the stator winding current command id The stator winding current commands id * and iq * are output using a map in which * and iq * are predetermined. By doing so, it is possible to refer to an appropriate stator winding current command even when the field winding voltage is limited, so that it is possible to suppress a decrease in output.
The field winding current command calculation unit 51 outputs the field winding current command if * in response to the torque command T *, using a map in which the field winding current command if * is predetermined.
The stator winding current command calculation unit 50 may use a map that does not correspond to the field winding voltage limit value vflim, or the stator winding current command calculation unit 50 and the field winding The current command calculation unit 51 may calculate the stator winding current commands id * and iq * and the field winding current command if * based on the rotor parameters and the like instead of the map.

FIG. 6 is a diagram of the field winding temperature protection unit 24 in the rotary machine control device according to the first embodiment.
The field winding temperature protection unit 24 includes addition / subtractors 60 and 63, a PI controller 61, and a voltage limiter 62.

The field winding temperature protection unit 24 tells the PI controller 61 based on the field winding temperature deviation tfmax−tf between the limited field winding temperature tfmax and the field winding temperature tf which is the temperature detection value. PI control is performed to generate the field winding voltage feedback limit value vflim **. An example of calculation in the PI controller is shown in Equation (4). Here, Kptf and Kitf are field winding temperature proportional gain and integral gain, respectively.

Kptf and Kitf are determined based on the transfer function from the voltage to the temperature of the rotating machine as in the equation (5). ts is the stator winding temperature, tmag is the magnet temperature, vdq is the stator winding voltage amplitude on the dq coordinate, vf is the field winding voltage amplitude, and G1 is from the stator winding voltage to the stator winding temperature. G2 is the transfer function from the field winding voltage to the stator winding temperature, G3 is the transfer function from the stator winding voltage to the field winding temperature, and G4 is the field winding voltage to the field. G5 shows the transfer function from the stator winding voltage to the magnet temperature, and G6 shows the transfer function from the field winding voltage to the magnet temperature. At this time, based on the transfer function G4, Kptf and Kitf are designed in consideration of stability, error convergence, robustness, influence on torque response, and the like. Here, the stator winding voltage amplitude Vdq on the dq coordinates is used for expression, but the same effect can be obtained by using the amplitude of the phase voltage or the line voltage.

Depending on the transfer function of G4, other controllers such as PID controller or PD controller, I controller, P controller, ID controller, and IP controller may be used instead of the PI controller of the equation (4). good. Normally, G1 to G6 do not have a pole at the origin, so by configuring the field winding temperature protection unit 24 to have an integrator as shown in equation (4), the field winding temperature tf and the field winding The error of the linear temperature limit value tflim can be converged. Further, since the response time constant of the field winding current is sufficiently larger than the response time constant of the field winding temperature, it is not necessary to consider the interference with the field current control.

When the transfer function changes due to the change in thermal resistance or heat capacity according to the rotation speed, the gain of each controller is changed. For example, in the case of an air-cooled rotary machine, the flow rate of air is large and the heat dissipation effect is high at high rotation speeds, so that the transmission gain from Vf to ts is small.
In addition, the thermal resistance or heat capacity changes depending on the temperature of surrounding parts and the like. Since the stator winding and the field winding are close to each other, if the temperature of the stator winding is higher than the temperature of the field winding, the heat dissipation effect will change due to the heat received from the stator winding. The transmission gain from to ts increases.

From the equation (5), since the field winding temperature tf is also affected by the stator winding voltage, the field winding voltage feedback limit value vflim ** generated by the PI controller 61 is expressed by the equation (6). Includes the stator winding interference voltage vsdiff * given in. When the non-linearity of the voltage-temperature characteristics of the rotating machine is strong, a correction gain is applied or a correction value is added when deriving the equations (4) and (6).

The addition / subtractor 63 subtracts the stator winding interference voltage vsdiff *, which interferes with the field winding temperature tf, from the field winding voltage feedback limit value vflim **, so that the field winding voltage is not interfered with. Calculate the limit value vflim *. By subtracting the component of the stator winding interference voltage, the temperature interference of the stator winding is prevented, the transfer function G4 from the field winding voltage to the field winding temperature, the field winding temperature proportional gain Kptf and The temperature control characteristics of the field winding can be determined by the integrated gain Kitf. In addition to the interference of the stator winding voltage as in Eq. (8), other interference may be considered, and if the disturbance suppression characteristic by the PI controller or the like is high, vsdiff * = 0 may be used. good. Further, when the influence of vsdiff * is large, the stator winding voltage may be limited.

FIG. 7 is a diagram illustrating the operation of the voltage limiter 62 of FIG. In FIG. 7, the solid line represents the field winding voltage limit value vflim * after decoupling the field winding voltage, the dotted line represents the field winding voltage maximum value vfmax, and the broken line represents the field winding voltage limit value vflim. When vflim * ≧ vfmax, the maximum output value has a margin with respect to the limit value, so vflim = vfmax. When vflim * <vfmax, the limit value is smaller than the maximum output value, so vflim = vflim *. The gains of Kpf and Kif are designed so that vflim * ≧ vfmax is satisfied during one control cycle so as not to limit the field winding voltage more than necessary at the time of starting and when the temperature limit is restored, or at the time of starting and temperature limiting. Only when returning, vflim * has an initial value.
Although not shown, when the voltage limit amplitude of the field winding voltage limit value vflim * is limited by the voltage limiter 62, even if the integrator of the PI controller 61 is subjected to anti-windup processing. good.

The maximum field winding voltage value vfmax is a value determined by the value of VDCf, but when the DC link voltage VDCf is limited instead of the field winding voltage limit value vflim, the value of vfmax is rated. It may be the maximum value of the field winding voltage.

FIG. 8 is a diagram illustrating the operation of the present embodiment that protects the field winding from heat. FIG. 8 (a) shows the field when the field winding voltage limit value vflim is obtained by a method other than the map or integral calculation, and FIG. 8 (b) shows the field when the field winding voltage limit value vflim is obtained by integral calculation. The magnetic winding temperature tf and the field winding voltage vf are shown, respectively.
While the voltage is being supplied to the field winding, the field winding temperature tf rises. As the field winding temperature tf approaches the limiting field winding temperature tfmax, the field winding voltage vf is limited by the field winding voltage limit value vflim. Since the field winding voltage vf is limited, the rate of temperature change of the field winding temperature tf becomes small, but since G1 to G6 usually do not have a pole at the origin, as shown in FIG. 8 (a). When calculating the field winding voltage limit value vflim by a method other than the map or integration calculation, if the expected characteristics of the rotating machine change due to temperature or magnetic flux, the field winding voltage limit value vflim will be changed. It may be converted to a value larger or smaller than expected, and the overheat protection of the rotating machine may not be possible, or the output may be reduced due to excessive protection than expected. On the other hand, in FIG. 8B, since the field winding temperature tf is integrated so as to follow the limiting field winding temperature tfmax, the field winding voltage is excessively applied even when the characteristics of the rotating machine are changed. The expected output can be obtained without any limitation. Further, even when the rotating machine characteristics change due to temperature or magnetic flux, or when disturbance is mixed, the robust characteristics of the PI controller or the like having the field winding temperature tf can appropriately protect the rotating machine from overheating.

When the rotor has a permanent magnet and a field winding, G6 becomes dominant if the temperature difference between the stator winding and the field winding is small. In order to protect by the temperature of the magnet, it may be configured as shown in FIG. In FIG. 9, tf in FIG. 6 is replaced with tmag, and it functions as a magnet temperature protection unit 25. At this time, the field winding voltage feedback limit value vflim ** and the stator winding interference voltage vsdiff * may be given by the equations (7) and (8), respectively. When the non-linearity of the voltage-temperature characteristics of the rotating machine is strong, a correction gain is applied or a correction value is added when deriving the equations (7) and (8).

When the stator winding temperature is protected instead of the field winding temperature protection unit, the same applies if the field winding voltage limit is replaced with the stator winding voltage limit. Specifically, the equation (4) may be replaced with the equation (9), and the equation (6) may be replaced with the equation (10). Here, Kpts and Kits are stator winding temperature proportional gain and integral gain, respectively, and are designed based on the transfer function G1. Note that vdqlim ** indicates the stator winding voltage feedback limit value, and vfdiff * indicates the field winding interference voltage. When the non-linearity of the voltage-temperature characteristics of the rotating machine is strong, a correction gain is applied or a correction value is added when deriving the equations (9) and (10).

Embodiment 2.
FIG. 10 shows the second embodiment. This embodiment shows an application example when the stator winding portion of the rotary machine is a double three-phase winding type, and the rotary machine control device 2000 in the present embodiment is the rotary machine control device in FIG. Distinguishers 20 correspond to the stator winding current control unit 21, the field winding current control unit 22, the current command generation unit 23, and the field winding temperature protection unit 24. 99, a first stator winding current control unit 100, a second stator winding current control unit 101, a field winding current control unit 102, a current command positive west portion 103, and a field winding temperature protection unit 104. doing. Further, the rotary machine control device 2000 drives and controls a rotary machine 90, for example, an AC rotary machine, and is a first stator winding power converter 96, a second stator winding power converter 97, and a field, respectively. It is connected to each winding of the rotating machine 90 via a magnetic winding power converter 98. Further, the rotary machine control device 2000 is connected to a position detector 91 and a temperature detector 92 provided in the rotary machine 90.

Further, the rotary machine control device 2000 is connected in series between the first stator winding power converter 96, the second stator winding power converter 97, the field winding power converter 98, and the rotary machine 90, respectively. It is connected to the current detector 93, the current detector 94 and the current detector 95.

The system of FIG. 10 basically operates in the same manner as the system of FIG. Further, the field winding voltage feedback limit value vflim ** and the stator winding interference voltage vsdiff * may be given by the equations (11) and (12), respectively. Kptf and Kitf are determined based on the transfer function from the voltage to the temperature of the rotating machine as in Eq. (13). When the non-linearity of the voltage-temperature characteristics of the rotating machine is strong, a correction gain is applied or a correction value is added when deriving the equations (11) and (12).

Although the rotary machine control device provided with the field winding temperature protection unit is shown, similarly, the stator winding can be provided with one or more stator winding temperature protection units based on the equation (11). Temperature protection can be achieved. Although omitted below, the same configuration can be realized when there are a plurality of sets of multi-phase windings.

Embodiment 3.
FIG. 11 is a block diagram of the rotary machine control device 3000 according to the third embodiment. In this embodiment, the limitation due to the field voltage of the first embodiment is replaced with the limitation due to the field current. As corresponding to the control unit 21, the field winding current control unit 22, the current command generation unit 23, and the field winding temperature protection unit 24, the differentialr 118, the stator winding current control unit 119, and the field It has a magnetic winding current control unit 120, a current command positive west portion 121, and a field winding temperature protection unit 122. Further, the rotary machine control device 3000 drives and controls a rotary machine 111, for example, an AC rotary machine, and the rotary machine 111 is via a stator winding power converter 116 and a field winding power converter 117, respectively. It is connected to each winding of. Further, the rotary machine control device 3000 is connected to a position detector 112 and a temperature detector 113 provided in the rotary machine 111.

Further, the rotating machine control device 3000 is connected to a position detector 112 and a temperature detector 113 connected in series between the stator winding power converter 116, the field winding power converter 117 and the rotating machine 111, respectively. ing.

The system of FIG. 11 basically operates in the same manner as the system of FIG. The field winding current feedback limit value iflim ** and the stator winding interference current isdiff *, which are the current command limit values, may be given by the equations (14) and (15), respectively. Kptf and Kitf are determined based on the transfer function from the current to the temperature of the rotating machine as in Eq. (16). Kptf and Kitf are determined based on the transfer function from the current to the temperature of the rotating machine as in Eq. (16). Ga is the transfer function from the stator winding current to the stator winding temperature, Gb is the transfer function from the field winding current to the stator winding temperature, and Gc is the transfer function from the stator winding current to the field winding temperature. Gd is the transfer function from the field winding current to the field winding temperature, Ge is the transfer function from the stator winding current to the magnet temperature, and Gf is the transmission from the field winding current to the magnet temperature. Shows a function. At this time, based on the transfer function Gd, Kptf and Kitf are designed in consideration of stability, error convergence, robustness, influence on torque response, and the like. idq indicates the stator winding current amplitude on the dq coordinates, and if indicates the field winding current amplitude. When the non-linearity of the current-temperature characteristics of the rotating machine is strong, a correction gain is applied or a correction value is given when deriving the equations (14) and (15).

Although omitted below, even when the temperature is limited by the current, the stator winding temperature protection unit and the magnet temperature protection unit may be used instead of the field winding temperature protection unit.
In addition, there are a wide variety of temperature protection units, such as each part to be protected or limited by voltage and current, and these may be used alone as in the first to third embodiments. It may be used in combination.

Embodiment 4.
FIG. 12 shows the fourth embodiment, which is a configuration when the rotary machine control device according to the first embodiment is applied to the vehicle generator motor. The rotating machine 1 is connected to the engine (internal combustion engine) 200 via a belt 201, serves as an auxiliary machine for the engine 200, and becomes a driving force for wheels via drive system parts, and generates electricity by using the rotation of the engine 200. conduct. That is, it is in the vicinity of the engine 200 and is in an environment where the temperature is likely to rise, and in order to protect the rotating machine 1 and the control device of the rotating machine 1, the overheat protection function is important. In addition, if the output is limited more than necessary, the driving force or the amount of power generation will be affected and the fuel efficiency will deteriorate. Therefore, it is necessary to set an appropriate limit. By using the control device of the AC rotary machine of the present embodiment for the power generation motor for vehicles, it is possible to set an appropriate limit according to the temperature, and it is possible to minimize the deterioration of the driving force or the amount of power generation. .. The rotating machine may be a motor for automobiles, a generator, or a motor generator.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

3 Temperature detector, 6 Stator winding power converter, 7 Field winding power converter, 21 Stator winding current control unit, 22 Field winding current control unit, 23 Current command generator, 24 Field Winding temperature protection unit

The rotary machine control device disclosed in the present application is a rotary machine control device that controls a power converter that applies a voltage to the windings of the rotary machine based on a voltage command, and is a temperature of a temperature-protected portion of the rotary machine. comprising a temperature detector for detecting the temperature protective unit for controlling the temperature to below the limit temperature, the temperature protective unit, limited by the voltage feedback based on the difference between the temperature of the limiting temperature and the temperature protected portion of the thermal protection object portion The value is limited by the voltage command limit value limited by the maximum voltage value of the winding of the rotating machine with the voltage limiter.

Claims (14)

A rotating machine control device that controls a power converter that applies a voltage to the windings of a rotating machine based on a voltage command, and a temperature detector that detects the temperature of a temperature-protected portion of the rotating machine, and the temperature. A rotary machine control device comprising a temperature protection unit for controlling the temperature to a temperature limit or lower, wherein the temperature protection unit limits the voltage command by a voltage command limit value based on the temperature. The rotary machine control device according to claim 1, wherein the temperature protection unit calculates the voltage command limit value based on an integral calculation of the temperature limit of the temperature protection target portion and the difference between the temperatures. The rotary machine control device according to claim 2, wherein the gain of the controller that performs the integral calculation is changed according to the temperature. The rotary machine control device according to claim 2, wherein the gain of the controller that performs the integral calculation is changed according to the rotation speed of the rotary machine. The rotary machine control device according to claim 1 or 2, wherein the temperature detector estimates the temperature or detects the temperature from a temperature sensor. The rotating machine is a rotating machine having a field winding and a stator winding, and the temperature protection unit targets at least one of the stator winding and the field winding for temperature protection. The rotary machine control device according to any one of claims 1 to 5, characterized in that. The rotor is a rotor having a magnet and a field winding on the rotor and a stator winding on the stator, and the temperature protection unit is the stator winding, the field winding or the magnet. The rotary machine control device according to any one of claims 1 to 5, wherein at least one of them is subject to temperature protection. The rotary machine control according to claim 6 or 7, wherein the temperature protection unit calculates the voltage command limit value based on the voltage commands of the field winding and the stator winding. Device. The current control unit is provided with a current control unit that calculates the voltage command based on the current command, and the current control unit is based on a voltage command limit value that the temperature protection unit calculates a current command of a winding different from the temperature protection target portion. The rotary machine control device according to claim 8, wherein the calculation is performed. A rotating machine control device that controls a power converter applied to the field winding of the rotating machine based on a current command, and a temperature detector that detects the temperature of a temperature-protected portion of the rotating machine, and the temperature. A rotary machine control device comprising a temperature protection unit for controlling the temperature to a temperature limit or lower, wherein the temperature protection unit limits the current command by a current command limit value based on the temperature. The rotary machine control device according to claim 10, wherein the temperature protection unit calculates the current command limit value based on an integral calculation of the temperature limit of the temperature protection target portion and the difference between the temperatures. The rotary machine control device according to claim 11, wherein the gain of the controller that performs the integral calculation is changed according to the temperature. The rotary machine control device according to claim 11 or 12, wherein the gain of the controller that performs the integration calculation is changed according to the rotation speed. The rotary device control device according to any one of claims 1 to 13, wherein the rotary machine is a motor, a generator, or a motor generator for an automobile.

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