JPH1118496A - Controller and control method for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a good travel control by estimating the magnet temperature of a synchronous machine from an estimated induction voltage and a temperature estimation table thereof and compensating for the output therefrom, depending on the increase of estimated magnet temperature of the synchronous machine. SOLUTION: A motor controller 5 is provided with a magnet temperature estimating means 232 and a magnet temperature compensating means 234. The magnet temperature estimating means 232 estimates the magnet temperature TMG from the relationship between a temperature estimation table 2322 and an induced voltage E010 estimated by an induced voltage estimating means 2321. The induced voltage increases as the magnet temperature increases, and thereby the motor voltage decreases. Consequently, the power factor fluctuates, and the output torque decreases. So, the magnet temperature compensating means 234 estimates the magnet temperature TMG from the estimated induction voltage with reference to the temperature estimation table 2322 and compensates for the d-axis current Id and the q-axis current Iq. In this way, the fluctuations in the output voltage of a synchronous machine due to the fluctuations of the magnet temperature TMG is compensated for through the compensation of current command values Id*, Iq*.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device and a control method for an electric vehicle, and more particularly to a magnetic pole position sensor such as a permanent magnet type synchronous motor as a wheel drive source and a permanent magnet type synchronous generator for charging a battery. TECHNICAL FIELD The present invention relates to a control device and a control method for an electric vehicle provided with a synchronous machine using the same.

[0002]

2. Description of the Related Art Conventionally, a control device for driving an AC motor for an electric vehicle, whether an induction motor or a synchronous motor using a permanent magnet as a motor, converts the current of the motor into a torque current I.
Vector control in which q and the excitation current Id are decomposed and controlled has been put to practical use. In order to compensate for a decrease in output due to a rise in the temperature of a magnet of this permanent magnet type synchronous motor, Japanese Patent Application Laid-Open No.
In 2915, only the q-axis current command Iq * is compensated based on the voltage and current of the motor and the temperature sensor.

[0003]

The output characteristics of a permanent magnet type synchronous motor with a change in temperature of a magnet differ depending on the magnet material. For example, the decrease in induced voltage due to temperature is approximately -0.2% / ° C for ferrite magnets and -0.1% for neodymium magnets.
/ ° C. The output or torque of the motor decreases due to the decrease in the induced voltage.

In particular, in a synchronous motor or a synchronous generator in which the mounting density of devices is increased in order to reduce the size and the performance of the device, the temperature of the magnet rises remarkably, and the output or torque of the synchronous machine drops remarkably.

[0005] As a means for detecting such a rise in magnet temperature of a permanent magnet type synchronous machine and compensating for a decrease in output due to the rise in temperature, the magnet temperature of the rotor is calculated from the core temperature of the stator of the synchronous machine mounted on the electric vehicle. Is indirectly estimated to compensate for the output reduction. However, according to experiments, a temperature error of about ± 30 ° C. occurs between the core temperature of the stator and the magnet temperature of the rotor when the magnet temperature rises or falls. Therefore, the method of estimating the magnet temperature based on the core temperature and compensating for the output drop cannot sufficiently compensate for the output of the synchronous machine and ensure the output accuracy.

[0006] As a method of accurately detecting an output fluctuation due to a rise in temperature of a permanent magnet type synchronous machine, a method of stopping an inverter and idling the synchronous machine to detect a voltage induced is considered. However, although this method can be performed in a laboratory, it cannot be performed with the synchronous machine mounted on an actual electric vehicle.

On the other hand, as a factor for reducing the output or torque of the permanent magnet type synchronous machine, demagnetization of the permanent magnet may be considered in addition to the temperature rise of the magnet.

The present invention relates to a control apparatus and control for an electric vehicle that can accurately estimate a magnet temperature rise of the synchronous machine in an electric vehicle equipped with a permanent magnet type synchronous machine, compensate for output fluctuations, and perform good running control. The aim is to provide a method.

Another object of the present invention is to accurately estimate a magnet temperature rise and a demagnetization of a permanent magnet in an electric vehicle equipped with a permanent magnet type synchronous machine to perform output compensation and other necessary measures. It is an object of the present invention to provide a control device for an electric car that can be operated.

[0010]

SUMMARY OF THE INVENTION The present invention provides a permanent magnet type synchronous generator and a synchronous machine for a motor using a magnetic pole position sensor, a power converter for driving the synchronous machine, a d-axis current command for the synchronous machine and q Current command generating means for generating a shaft current command, d
Based on the detected qq-axis current command and the dq-axis current from the synchronous machine current, the dq-axis voltage command values Vd * and Vq * are subjected to coordinate conversion processing, and the AC voltage command values Vu *, Vv *, Vw *, Further, dq-axis current control means for performing phase calculation processing and speed calculation used in coordinate conversion processing from the magnetic pole position sensor and angle sensor, and PWM means for outputting a signal for driving a power element of the power converter from the AC voltage command value An induced voltage estimating means for estimating an induced voltage of the synchronous machine; a temperature estimating table for giving a relationship between an induced voltage of the synchronous machine and a temperature determined by a material of a permanent magnet; Magnet temperature estimating means for estimating the magnet temperature of the synchronous machine from the estimated induced voltage of the synchronous machine and the temperature estimation table, and outputting the synchronous machine in response to the estimated increase in the magnet temperature of the synchronous machine. Characterized in that a magnet temperature compensating means for compensating.

Another feature of the present invention is that the induced voltage estimating means includes a q-axis voltage command value Vq *, a d-axis current command value Id *,
It consists in inputting the speed and the input voltage of the power converter.

Another feature of the present invention is that the current commands Id * and Iq * of the q-axis current are compensated based on the magnet temperature estimated value which is the output value of the magnet temperature estimating means.

Another feature of the present invention is that a permanent magnet type synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and a d-axis current command and a q-axis current command for the synchronous machine are generated. Current command generating means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value.
A control method for an electric vehicle by a control device comprising: q-axis current control means; and PWM control means for outputting a signal for driving a power element of the power converter from the AC voltage command value. Estimating the induced voltage of the synchronous machine, and estimating the induced voltage of the synchronous machine by the magnet temperature estimating means from a temperature estimation table that gives a relationship between the induced voltage of the synchronous machine and the temperature determined by the material of the permanent magnet and the estimated induced voltage of the synchronous machine. The magnet temperature is estimated, and the output of the synchronous machine is compensated for by magnet temperature magnet temperature compensating means in accordance with the estimated magnet temperature rise.

According to the present invention, in order to estimate the magnet temperature from the estimated induced voltage and the temperature estimation table, an increase in the magnet temperature of the synchronous machine in an electric vehicle equipped with a permanent magnet type synchronous machine is accurately estimated to reduce the output fluctuation. It is possible to provide a control device and a control method for an electric vehicle that can compensate and perform good traveling control.

Also, in an electric vehicle equipped with a permanent magnet type synchronous machine, it is possible to accurately estimate the magnet temperature rise of the synchronous machine and the demagnetization of the permanent magnet, and perform output compensation and other necessary measures.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a configuration of a drive control system for an electric vehicle according to an embodiment of the present invention. The motor 1 is a permanent magnet type synchronous motor, and uses an inverter, that is, an inverter 2 as a power converter. The encoder 3 as a rotation angle sensor and a magnetic pole position detector 4 for detecting a magnetic pole position are directly connected to the permanent magnet type synchronous motor 1. The motor control device 5 performs PW based on the outputs of the encoder 3 and the magnetic pole position detector 4 and the output of the current detector 6.
An M signal is generated to control the inverter 2.

The drive system control unit 11 sends a motor torque command τM * corresponding to the operation amounts of the accelerator petal and the brake petal to the motor control device 5, and the motor 1 generates the torque corresponding to the operation amounts of the accelerator petal and the brake petal. Control to occur. The motor control device 5 includes a dq-axis current control function for generating a dq-axis current command value and an AC voltage command value based on the outputs of the encoder 3 and the magnetic pole position detector 4 and the output of the current detector 6, and an AC voltage command value. Generating a PWM signal for controlling inverter 2 based on PWM
It has a signal generation function. The inverter 2 is configured using six power elements (IGBTs) and diodes connected in parallel to each power element.
It has a three-phase bridge circuit for controlling the current flowing through each phase winding and one smoothing capacitor.

The power of the permanent magnet type synchronous motor 1 is supplied from a battery 7 or a permanent magnet type synchronous generator 9 driven by a gasoline engine 8 via a converter 10. In addition, the permanent magnet type synchronous generator 9 controls the battery 7.
Charge.

FIG. 2 shows a detailed functional block diagram of the motor control device 5 for controlling the permanent magnet type synchronous motor 1. The motor control device 5 includes 3 / 2-phase conversion means 202, IdIq
Current control means 204, 2/3 phase conversion means 206, PWM
A control unit 208, a phase calculation unit 210, and a speed calculation unit 212 are provided. The input side of the speed calculation means 212
The input side of the phase calculating means 210 is connected to the encoder 3 and the magnetic pole position detecting means 4. The motor control device 5 further includes a current command generation unit 220 including an Iq control unit 224 and an Id control unit 226.

The motor control device 5 also has magnet temperature estimating means 23 for estimating the magnet temperature of the permanent magnet type synchronous motor 1.
2. Includes magnet temperature compensating means 234 for compensating the motor output as the magnet temperature rises, magnet abnormality detecting means 242 for detecting magnet demagnetization, and command correcting means 244 for correcting output according to the amount of magnet demagnetization. A magnet temperature compensating means 230 is provided. The magnet temperature estimating means 232 calculates the q-axis voltage command value Vq
*, D-axis current command value Id *, rotation speed ω of the synchronous machine, and DC voltage VB of power converter 2 as inputs, and an induced voltage estimating means 2321 for calculating an estimated induced voltage of the synchronous machine. A temperature estimation table 2322 for estimating the magnet temperature TMG is provided.

The permanent magnet type synchronous generator 9 also has a magnet temperature estimating means, a magnet temperature compensating means, a magnet abnormality detecting stage and a command correcting means similar to the motor control device 5 of the permanent magnet type synchronous motor 1. A control device (not shown) including compensation means is provided. Hereinafter, the motor control device 5 will be described, and the description of the control device of the permanent magnet type synchronous generator 9 will be omitted.

In the motor control device 5, the command value Iq * of the q-axis current corresponding to the torque component current is the torque command value τ
It is calculated by the Iq control means 224 based on M * and the rotation speed.
On the other hand, the command value Id * of the d-axis current is also calculated by the Id control means 226 based on the torque command value τM * and the rotation speed. As described above, the Id and Iq tables 224 and 226 in the motor control device store the current command values Iq * and Id * required for high-efficiency control based on the torque command value τM0 and the rotation speed.
Is calculated.

The 3 / 2-phase coordinate conversion means 202 performs a 3 / 2-phase coordinate conversion process on the three-phase alternating current of the motor current detected by the current detector 6 to calculate d- and q-axis currents Id and Iq. These detected values Id, Iq and command values Id *, Iq *
IdIq current control means 204 performs a proportional or proportional integral current control process based on the voltage command values Vd * and Vd *.
Calculate q *.

Further, the 2 / 3-phase conversion means 206 performs 2 / 3-phase coordinate conversion to perform a 3-phase AC voltage command value VU.
*, VV *, VW * are calculated. PWM control means 208
Compares the voltage command values VU *, VV *, and VW * with a carrier signal of a triangular wave signal, generates a PWM signal, and drives the inverter 2. By applying the PWM-controlled voltage to the motor 1 in this manner, the motor current is controlled so as to match the current command values Iq * and Id *.

The 2/3 phase conversion processing 206, 3 phase / 2
The phase angle θ1 used in the coordinate transformation processing of the phase coordinate transformation means 202 is calculated by the phase calculation means 210 by using the magnetic pole position detector 4 for outputting a signal having the same phase as the induced voltage of the electric motor 1, It is calculated from each output of the encoder 3 to output.

FIG. 3 shows the phase relationship of the phase angle θ1 inside the motor control device 5 with respect to the output signal of the magnetic pole position detector 4, the motor current I1, and the induced voltage E0. The phase signal is
Phase calculation means 21 for accumulating pulse signals of encoder 3
The calculation is performed with 0, and a sawtooth signal is obtained. A magnetic pole position signal, which is an output signal of the magnetic pole position detector 4, is based on an induced voltage E of the electric motor 1.
Synchronize with 0. By performing such processing,
The motor control device 5 performs high-efficiency control with the torque of the torque command value τM * and minimizing loss.

FIG. 4 shows a vector diagram of the electric motor 1 at that time. The optimum lead angle β (β = tan-1 (Id * / Iq *)) is controlled by Iq * and Id * for obtaining a high efficiency point. The reference point of the advance angle β is the time point t0 shown in FIG. 3, and the current I1 controlled at the time point t0 is indicated by a broken line.

The output torque of the electric motor 1 is expressed by equation (1). τM = Pn [｛E0 + (1-ρ) LdId｝ Iq] (1) where Pn is a constant, ρ is a ratio between Lq and Ld, and E0 is an induced voltage.

In the equation (1), the first term on the right side is called synchronous torque, and the second term is called reactance torque.

FIG. 5 shows a torque characteristic in which the applied voltage to the motor is constant and the lead angle β is variable. The sum of the synchronous torque and the reactance torque is the generated torque τM. As described above, since the synchronous motor having the reverse salient pole characteristic in which the ρ of the equation (1) is larger than 1 generates the maximum torque when the lead angle β is around 45 degrees, the control is performed at the angle or more. The electric vehicle is driven by such an operation.

Next, the operation of the temperature compensation control of the motor will be described with reference to FIG.
This will be described below. First, FIG. 6 shows the relationship between the induced voltage E0 and the output torque characteristics with respect to the magnet temperature TMG of the permanent magnet type synchronous motor. It can be seen that the induced voltage and the output torque decrease as the magnet temperature TMG increases.

The basic equations of voltage and current of the synchronous machine are as shown in the following equations. Vd = Xq · Iq−r1 · Id Vq = E0 + Xd · Id + r1 · Iq (2) Here, if r1 is ignored, Vd = Xq · Iq, Vq = E0 + Xd · Id (3) Therefore, E0 = Vq−Xd・ Id

Here, Vq uses a voltage command value Vq * in the motor control device 5 and Xd uses a fixed value standardized at 1/300 min. Id uses the command value Id *.

The induced voltage E0 increases in proportion to the rotation speed of the synchronous machine. Therefore, the induced voltage E0 is changed to a specific rotational speed ω
Standardize with For example, the induced voltage E010 standardized at 1/300 min is as follows.

E010 = E0 × (ω3000 / ωr) (4) Therefore, E010 = (ω3000 / ωr) × ｛(VB0 / VB) × Vq * −Xd · Id *｝ = k1 · Vq * −k2 · Xd Id * (5) In the equation (5), the voltage command value Vq * is corrected by the DC voltage VB. VB0 is a design value, and VB is an actually measured value. The voltage command value Vq * in the motor control device 5 is substantially equal to PWM.
Since it is a signal for generating a signal, it can be represented as Vq * shown in a vector diagram as shown in FIG. 4 by correcting it according to the magnitude of VB. In the equation (5), E010 is calculated by varying the coefficients of k1 and k2 depending on the rotational speed ωr.

The magnet temperature estimating means 232 estimates the magnet temperature TMG from the relationship between the estimated induced voltage E010 obtained by the induced voltage estimating means 2321 and the temperature estimating table 2322.

FIG. 7A shows a motor control operation vector diagram when the magnet temperature is low, and FIG. 7B shows a motor control operation vector diagram when the magnet temperature is high. In these vector diagrams, Xd and Xq are dq-axis impedances, Xd
= ΩfLd, Xq = ωfLq, and as shown in FIG. 8, Ld becomes constant irrespective of Id, and Lq decreases according to Iq.

In FIG. 7, E00>
The induced voltage E decreases like E01. As a result, the motor voltage decreases (V10> V11). As a result, the power factor fluctuates and the output torque decreases. Therefore, the magnet temperature TMG is estimated from the estimated induced voltage E010 based on the arithmetic expression (5) with reference to the temperature estimation table, and Id and Iq are compensated.

As described above, according to the present invention, the output fluctuation of the synchronous machine due to the change of the magnet temperature TMG is determined by the current command values Id *, Iq
* It is characterized by compensation by compensation.

That is, as shown in the detailed block diagram of FIG. 9, the magnet temperature compensating means 234
341 and an Iq compensation table 2342. These Id compensation table 2341 and Iq compensation table 234
2 is based on the synchronous machine output command τM0 and magnet temperature TMG,
It outputs compensation coefficients Kd and Kq for compensating the current commands Id * and Iq * for the dq-axis currents.

FIGS. 10 and 11 show examples of data of the Id and Iq tables of the magnet temperature compensation control means. I in FIG.
In the d table, the compensation coefficient Kd of the current command value Id * can be obtained by inputting the magnet temperature estimated value TMG and the torque command value equivalent value τM0. In the Iq table of FIG. 11, the compensation coefficient Kq of the current command value Iq * can be obtained by inputting the magnet temperature estimated value TMG and the torque command value equivalent value τM0.

FIG. 12 shows a procedure for estimating the magnet temperature using the temperature estimation table 2322 by the magnet temperature estimating means 232.

First, immediately after starting the motor, the core temperature TM2
And the estimated magnet temperature TMGO are equal ((1) in FIG.
E020 obtained by referring to the temperature estimation file 2322 (FIG. 12)
(2)) and EO10 calculated by the equation (5) are compared, and E020 = E
O10 in advance so that the coefficient k1. Match k2 and put. By doing so, the E calculated by equation (5) during operation is obtained.
The magnet temperature TMG1 is estimated from O10. ((4) in FIG. 12) The magnet temperature TMG10 estimated in this manner is very close to the actual magnet temperature of the synchronous machine. Therefore, according to the method of the present invention, as shown in FIG. 13, accurate temperature compensation following the actual magnet temperature change can be performed, and the control accuracy of the output torque is improved compared to the estimation method based on the core temperature. I do.

As a magnet temperature estimating means according to another embodiment of the present invention, as shown in FIG. 14, EO10 calculated by the equation (5) is used.
Of the induced voltage EO100 at a magnet temperature of 100 ° C. (FIG. 14)
From (1)), the magnet temperature TMGO is calculated using the temperature estimation table.
May be estimated.

If the estimated magnet temperature reaches the permissible demagnetizing temperature TMGMAX of the magnet in FIGS.
2 performs abnormal processing such as system stoppage. If the degree of the demagnetization is small and the operation is possible as a result of measuring the induced voltage after the system is stopped and the temperature slightly exceeds the allowable demagnetization temperature TMGMAX, the magnet temperature estimating means 232 newly adds the characteristic ( The magnet temperature estimated by the dashed line) is estimated. Since the output decreases due to a slight demagnetization, the torque command τM * is increased as much as possible by the command correction means 244, and the temperature is compensated by the magnet temperature compensation means 234.
The operation is continued while monitoring the magnet temperature by the abnormality determination means 242.

[0046]

According to the present invention, in order to estimate the magnet temperature from the estimated induced voltage and the temperature estimation table, the magnet temperature rise of the synchronous machine in the electric vehicle equipped with the permanent magnet synchronous machine is accurately estimated and output. It is possible to provide an electric vehicle control device capable of compensating for fluctuations and performing good traveling control.

According to the present invention, it is also possible to accurately estimate the magnet temperature rise and the demagnetization of the permanent magnet of the synchronous machine in the electric vehicle equipped with the permanent magnet type synchronous machine, and perform output compensation and other necessary measures. it can.

[Brief description of the drawings]

FIG. 1 is a drive system configuration diagram of an electric vehicle including a power generation system according to an embodiment of the present invention.

FIG. 2 is a detailed functional block diagram of the motor control device of FIG. 1;

FIG. 3 is a diagram showing a phase relationship between phase angles θ1 and θ2 inside the motor control device.

FIG. 4 is a vector diagram at the time of control operation of the synchronous motor.

FIG. 5 is a torque characteristic diagram in which the applied voltage to the electric motor is constant and the lead angle β is variable.

FIG. 6 is a diagram showing a relationship between an induced voltage E0 and an output torque characteristic with respect to a magnet temperature.

FIG. 7 is a diagram showing a relationship between a motor control operation vector diagram and a magnet temperature change.

FIG. 8 is a diagram showing a relationship between Id and Iq and Ld and Lq.

FIG. 9 is a detailed control block diagram of the magnet temperature compensation control means shown in FIG. 2;

FIG. 10 is a diagram showing data of an Id table of a magnet temperature compensation control unit.

FIG. 11 is a diagram showing data of an Iq table of a magnet temperature compensation control unit.

FIG. 12 shows a procedure for estimating a temperature by magnet temperature estimating means using a temperature estimating table.

FIG. 13 is a diagram showing the effect of the present invention.

FIG. 14 is an operation explanatory view of another embodiment of the present invention.

FIG. 15 is a diagram illustrating a relationship between a magnet temperature, an allowable demagnetization characteristic, and an allowable demagnetization temperature.

[Explanation of symbols]

5 ... motor control device, 202 ... 3/2 phase conversion means, 20
4 ... IdIq current control means, 206 ... 2/3 phase conversion means, 208 ... PWM control means, 210 ... Phase calculation means,
212 ... speed calculation means, 224 ... Iq control means, 226
... Id control means, 220 ... Current command generation means, 232 ...
Magnet temperature estimating means, 234: magnet temperature compensating means, 242
... Magnet abnormality detection means, 244 ... Command correction means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobunori Matsudaira 2520 Takada, Hitachinaka-shi, Ibaraki Automobile Division, Hitachi, Ltd.

Claims (10)

[Claims] 1. A permanent magnet type synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. Dq-axis current control means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value;
In a control device for an electric vehicle, comprising: a PWM control unit that outputs a signal for driving a power element of the power converter from the AC voltage command value, an induced voltage estimating unit that estimates an induced voltage of the synchronous machine,
Magnet temperature estimating means for estimating the magnet temperature of the synchronous machine from the temperature estimation table for giving a relationship between the induced voltage of the synchronous machine and the temperature determined by the material of the permanent magnet, and the estimated induced voltage of the synchronous machine and the temperature estimation table And a magnet temperature compensating means for compensating the output of the synchronous machine according to the estimated increase in the magnet temperature of the synchronous machine. 2. The apparatus according to claim 1, wherein said magnet temperature compensating means corrects said d and q axis current commands based on a magnet temperature estimated value which is an output value of said magnet temperature estimating means. 2. The control device for an electric vehicle according to claim 1. 3. The inductive voltage estimating means estimates the synchronous machine by inputting the q-axis voltage command value, the d-axis current command value, the rotation speed of the synchronous machine, and the input DC voltage of the power converter. Calculating an induced voltage, the magnet temperature estimating means estimates the magnet temperature from the estimated induced voltage and the temperature estimation table, and the magnet temperature compensating means calculates the magnet temperature estimated value, the Id compensation table, and the Iq compensation table. The control device for an electric vehicle according to claim 2, wherein the current command of the dq-axis current is compensated based on the following. 4. The electric vehicle according to claim 3, wherein said induced voltage estimating means has a function of correcting said q-axis voltage command value according to an input DC voltage of said power converter. Control device. 5. The Id compensation table and the Iq compensation table of the magnet temperature compensating means output a current command compensation value of the dq-axis current with an output command of the synchronous machine and the magnet temperature estimated value as inputs. The control device for an electric vehicle according to claim 3, wherein the control device is configured to: 6. A permanent magnet type synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. Dq-axis current control means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value;
In a control device for an electric vehicle, comprising: a PWM control unit that outputs a signal for driving a power element of the power converter from the AC voltage command value, an induced voltage estimating unit that estimates an induced voltage of the synchronous machine,
Magnet temperature estimating means for estimating the magnet temperature of the synchronous machine from the temperature estimation table for giving a relationship between the induced voltage of the synchronous machine and the temperature determined by the material of the permanent magnet, and the estimated induced voltage of the synchronous machine and the temperature estimation table And an abnormality determining means for detecting demagnetization of a permanent magnet of the synchronous machine based on the estimated magnet temperature of the synchronous machine. 7. A permanent magnet synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. Dq-axis current control means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value;
A control device for an electric vehicle including a PWM control unit that outputs a signal for driving a power element of the power converter from the AC voltage command value, wherein an induced voltage estimating unit that estimates an induced voltage of the synchronous machine; A temperature estimation table that gives a relationship between the induced voltage and the temperature of the synchronous machine determined by a material of the magnet; and a magnet temperature estimating unit that estimates a magnet temperature of the synchronous machine from the estimated induced voltage of the synchronous machine and the temperature estimation table. Abnormality determination means for detecting demagnetization of the permanent magnet of the synchronous machine based on the estimated magnet temperature of the synchronous machine; and a command for compensating the output of the synchronous machine according to the demagnetization of the permanent magnet. A control device for an electric vehicle, comprising: command correction means for correcting a value. 8. A permanent magnet type synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. Dq-axis current control means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value;
In a control device for an electric vehicle, comprising: a PWM control unit that outputs a signal for driving a power element of the power converter from the AC voltage command value, an induced voltage estimating unit that estimates an induced voltage of the synchronous machine,
Magnet temperature estimating means for estimating the magnet temperature of the synchronous machine from the temperature estimation table for giving a relationship between the induced voltage of the synchronous machine and the temperature determined by the material of the permanent magnet, and the estimated induced voltage of the synchronous machine and the temperature estimation table Abnormality determination means for detecting demagnetization of the permanent magnet of the synchronous machine based on the estimated magnet temperature of the synchronous machine; and synchronizing in accordance with an increase in the magnet temperature estimated value and demagnetization of the permanent magnet. And a magnet temperature compensating means for compensating the output of the electric machine. 9. A permanent magnet type synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. Dq-axis current control means for generating a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performing a coordinate conversion process to generate an AC voltage command value;
A control method for an electric vehicle, comprising: a PWM control unit that outputs a signal for driving a power element of the power converter from the AC voltage command value, wherein an induced voltage of the synchronous machine is estimated by an induced voltage estimation unit. Magnet temperature estimating means for estimating the magnet temperature of the synchronous machine from a temperature estimation table that gives a relationship between the induced voltage of the synchronous machine and the temperature determined by the material of the permanent magnet and the estimated induced voltage of the synchronous machine; A method for controlling an electric vehicle, wherein the dq-axis command value is compensated for by a command correction means in accordance with an estimated rise in the magnet temperature by a temperature magnet temperature compensation means. 10. A permanent magnet synchronous machine using a magnetic pole position sensor, a power converter for driving the synchronous machine, and current command generating means for generating a d-axis current command and a q-axis current command for the synchronous machine. A dq-axis current control unit that generates a dq-axis voltage command value based on the d- and q-axis current commands and the current detection value of the synchronous machine, and performs a coordinate conversion process to generate an AC voltage command value; A PWM control means for outputting a signal for driving a power element of the power converter from an AC voltage command value, wherein the induced voltage of the synchronous machine is estimated by an induced voltage estimating means; An estimating means for estimating a magnet temperature of the synchronous machine from a temperature estimation table for giving a relation between an induced voltage of the synchronous machine determined by a material of the permanent magnet and a temperature, and an estimated induced voltage of the synchronous machine; To Detecting the demagnetization of the permanent magnet of the synchronous machine based on the estimated magnet temperature of the synchronous machine, and compensating the output of the synchronous machine according to the demagnetization of the permanent magnet by command correction means. A control method for an electric vehicle, comprising: