JPH06197405A - Control equipment for electric rolling stock - Google Patents

Abstract

PURPOSE:To provide readherence when an induction motor idles or slides by adding a predetermined slip frequency to a signal responsive to a minimum speed at the time of power drive, subtracting the predetermined slip frequency from a signal responsive to a maximum speed at the time of regenerative, and controlling output frequencies of inverters. CONSTITUTION:Inverters 5a-5d drive induction motors 6a-6d. All pulse generators 7 which output pulse signals in response to the speeds of the motors 6a-6d are connected to minimum.maximum value selector 6. Here, even if one of the motors idles or slides, if the motor to be driven by other inverter is adhered, a minimum value is selected by the selector 8 at the time of power drive, and a maximum value is selected at the time of regenerative. Thus, an output frequency of the inverter is not raised more than an acceleration of an electric railcar, both the slip frequency and torque of the idled motor are reduced to be easily adhered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric vehicle suitable for improving adhesive performance.

[0002]

2. Description of the Related Art FIG. 7 is a control block diagram showing a conventional electric vehicle control device disclosed in, for example, Japanese Patent Publication No. 61-1964, in which 1 is an overhead line and 2 is a sliding line on the overhead line 1. The pantograph 3 is connected to the output side of the pantograph 2, and the filter reactor 4 is connected to the output side of the pantograph 2.
A filter capacitor connected between the output side of
5 is an inverter connected to the output side of the filter reactor 3, 6 is a plurality of induction motors connected to the output side of the inverter 5, 7 is a pulse generator connected to the output side of each induction motor 6, and 8 is each pulse Minimum / maximum value selector connected to the output side of the generator 7, 9 is an adder / subtractor connected to the output side of the minimum / maximum value selector 8, and 10 its input side is connected to the output side of the adder / subtractor 9. The output of the frequency control device is connected to the inverter 5.

Next, the operation will be described. The power supplied from the overhead wire 1 to the filter reactor 3 via the pantograph 2 is further supplied to the inverter 5. The inverter 5 outputs the variable voltage and variable frequency of the input power source. The filter capacitor 4 provided between the ground end of the inverter 5 and the filter reactor 3 removes noise from the power supply supplied to the inverter 5. Inverter 5
The current output from is supplied to the induction motors 6A to 6D connected to the inverter 5. This induction motor 6A-6
The pulse generators 7A to 7D provided in each D generate a pulse train according to the rotation speed of the induction motors 6A to 6D. The output values of the pulse generators 7A to 7D are selected by the minimum / maximum value selector 8 based on a power running command or a regenerative command from a command unit (not shown) and a minimum value during power running and a maximum value during regenerative power. Then, the minimum / maximum value selector 8 converts the pulse signal into a voltage,
Input to the adder / subtractor 9. When the output of the minimum / maximum value selector 8 is input to the adder / subtractor 9, the adder / subtractor 9 adds the voltage of the slip frequency Δf to the output of the minimum / maximum value selector 8 during power running, and subtracts during regeneration. Then, the output frequency of the inverter 5 is controlled by outputting to the inverter 5.

[0004]

Since the conventional electric vehicle control device is constructed as described above, the induction motor 6 is used.
When all the shafts A, 6B, 6C, and 6D run idle during power running, the output frequency of the inverter 5 exceeds the acceleration of the electric vehicle and rises, so that re-viscosity becomes impossible. In addition, there is a problem that it is necessary to manage the wheel diameter difference within one vehicle to be kept within a certain fixed value.

The present invention has been made to solve the above-mentioned problems, and an electric vehicle having a plurality of inverters has an excellent readhesion characteristic when idling or gliding occurs. It is to provide a control device.

[0006]

A control device for an electric vehicle according to claim 1 of the present invention is applied to an electric vehicle provided with a plurality of sets of one induction motor and one inverter for driving the induction motor. A minimum / maximum rotational speed detecting means for detecting the minimum rotational speed or the maximum rotational speed among the rotational speeds of the induction motor in the plurality of sets, and a predetermined signal in accordance with the minimum rotational speed during power running of the electric vehicle. A frequency control means for controlling the output frequency of each inverter with a signal to which a slip frequency is added, and controlling the output frequency of each inverter with a signal obtained by subtracting a predetermined slip frequency from a signal according to the maximum rotation speed during regeneration. Is provided.

The control device for an electric vehicle according to claim 2 of the present invention is applied to an electric vehicle including a plurality of sets of one induction motor and one inverter for driving the induction motor.
A wheel diameter in the electric vehicle from the deviation between the rotation speed of the induction motor driven by the inverter in one set and the rotation speed of the induction motor driven by the inverter in another set while the electric car is running. Wheel diameter calculation means for calculating the difference between the wheel diameters, correction means for correcting the rotational speed of the induction motor driven by the inverters in the other set based on the difference in the wheel diameters, and the inverters in the one set. Among the rotation speed of the induction motor and the rotation speed of the induction motor corrected by the correction means, a minimum maximum rotation speed detection means for detecting a minimum rotation speed or a maximum rotation speed, and when the electric vehicle is running, The output frequency of each of the inverters is controlled by a signal obtained by adding a predetermined slip frequency to the signal corresponding to the minimum rotation speed, and a predetermined slip from the signal corresponding to the maximum rotation speed during regeneration. It is provided with a frequency control means for controlling the output frequency of the inverters in the signal obtained by subtracting the frequency.

A control device for an electric vehicle according to a third aspect of the present invention is applied to an electric vehicle having a plurality of sets of a plurality of induction motors and one inverter for driving the induction motors.
Among the rotation speeds of the induction motor in the plurality of sets, a minimum maximum rotation speed detection means for detecting a minimum rotation speed or a maximum rotation speed, and a predetermined slip in a signal according to the minimum rotation speed during power running of the electric vehicle. The output frequency of each of the inverters is controlled by a signal to which a frequency is added, and frequency control means for controlling the output frequency of each of the inverters by a signal obtained by subtracting a predetermined slip frequency from a signal according to the maximum rotation speed during regeneration. It is provided.

Further, a control device for an electric vehicle according to a fourth aspect of the present invention is applied to an electric vehicle provided with a plurality of sets of a plurality of induction motors and one inverter for driving the induction motors.
Obtain the minimum or maximum speed of all induction motors from the minimum or maximum speed of the plurality of induction motors in each set and the minimum or maximum speed of the induction motors in the other sets. Minimum and maximum rotation speed detection means, at the time of power running of the electric vehicle, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed, and at the maximum rotation speed during regeneration. A frequency control means for controlling the output frequency of each of the inverters is provided by a signal obtained by subtracting a predetermined slip frequency from the corresponding signal.

Furthermore, the control device for an electric vehicle according to claim 5 of the present invention is applied to an electric vehicle provided with a plurality of sets of an induction motor and an inverter for driving the induction motor, and a plurality of sets in the plurality of sets are used. Among the induction motors, during power running, it is based on the rotation speed of the rear induction motor with respect to the traveling direction of the electric vehicle, and during regeneration, based on the rotation speed of the front induction motor with respect to the traveling direction of the electric vehicle. A minimum maximum rotation speed detecting means for detecting the minimum rotation speed or the maximum rotation speed, and a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed during the power running of the electric vehicle. Frequency control means is provided for controlling the frequency and controlling the output frequency of each inverter by a signal obtained by subtracting a predetermined slip frequency from the signal corresponding to the maximum rotation speed during regeneration.

[0011]

According to the control device for an electric vehicle according to claim 1 of the present invention, when there is only one induction motor driven by the self-inverter, even if the induction motor idles or slides, another inverter is driven. If the induction motor driven by is sticky, the minimum and maximum speed detection means detect the minimum speed during power running and the maximum speed during regeneration, so the output frequency of the inverter rises above the acceleration of the electric vehicle. There is nothing to do.

Further, according to the control device for an electric vehicle according to claim 2 of the present invention, the deviation of the wheel diameter is corrected when the rotation speed is detected. Therefore, in addition to the function of claim 1, the minimum rotation speed is obtained. Alternatively, the maximum rotation speed can be detected with high accuracy.

Further, according to the control device for an electric vehicle according to claim 3 of the present invention, in the case where there are a plurality of induction motors driven by the self-inverter, even if the induction motors slip or slide, other inverters are used. If the induction motor driven by is sticky, the minimum and maximum speed detection means detect the minimum speed during power running and the maximum speed during regeneration, so the output frequency of the inverter rises above the acceleration of the electric vehicle. There is nothing to do.

Further, according to the control device for an electric vehicle according to claim 4 of the present invention, as in the case of claim 3, when there are a plurality of induction motors driven by the own inverter, these induction motors run idle or Even if the vehicle slides, if the induction motor driven by another inverter is stuck, the minimum and maximum rotation speed detection means detects the minimum rotation speed during power running and the maximum rotation speed during regeneration, so the output frequency of the inverter Does not rise above the acceleration of the electric car.

Furthermore, according to the control device for an electric vehicle according to claim 5 of the present invention, the minimum rotation speed is determined based on the rotation speed of the induction motor connected to the wheels that are hard to idle during power running and difficult to slide during regeneration. Since the number or the maximum number of rotations is obtained, the same operation as in claim 1 is achieved.

[0016]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to FIG.
The block diagram shown in FIG. In FIG. 1, the same reference numerals as those in FIG. 7 have the same functions. In the first embodiment, a control device for an electric vehicle including a plurality of sets of one induction motor and one inverter driving the induction motor is shown. The first embodiment is different from the conventional configuration shown in FIG. 7 in that each inverter 5 (for example, 5
There is only one induction motor 6 (eg 6a) driven by a) and the other inverter 5 (eg 5b)
The pulse signal of the pulse generator 7 output according to the rotation speed of the induction motor 6 (for example, 6b) driven by
This is also input to the minimum / maximum value selector 8 of its own inverter (here, the inverter 5a for the induction motor 6a). That is, all the pulse generators 7 are connected to each minimum / maximum value selector 8.

Therefore, according to the first embodiment, there is only one induction motor 6a driven by the self-inverter 5a, and even if the induction motor idles or glides, an induction motor driven by another inverter can be used. If there is stickiness, the minimum / maximum value selector 8 selects the minimum value during power running and the maximum value during regeneration, so the output frequency of the inverter does not rise above the acceleration of the electric vehicle, so it slipped. The slip frequency of the induction motor decreases immediately and the torque decreases, making it easier to re-stick. Here, the minimum / maximum value selector 8 constitutes the minimum / maximum rotational speed detector of claim 1, which detects the minimum rotational speed or the maximum rotational speed of the induction motor 6.

Example 2. The second embodiment of the present invention will be described with reference to the block diagram shown in FIG. The second embodiment differs from the first embodiment in that a subtractor 21 and a correction unit 22 that corrects the rotation speed of the induction motor 6 are added. The subtracter 21 has a pulse generator 7a corresponding to the induction motor 6a driven by the self-inverter 5a connected to one input side of each, and an induction driven by the other inverters 5b to 5d on the other input side of each. Electric motor 6b ~
Each of the pulse generators 7b to 7d corresponding to 6d is connected, and the correction means 22 is connected to the output side thereof. And this subtractor 21 has its own inverter 5a.
It has a function of outputting the rotation speed Δf obtained by subtracting the rotation speed of each of the induction motors 6b to 6d driven by the other inverters 5b to 5d from the rotation speed of the induction motor 6a driven by the correction means 22. The output from the subtractor 21 is the correction means 22.
The correction means 22 stores Δf only during the running, and corrects the rotation speed of the induction motor driven by another inverter during power running or regeneration to obtain each induction due to the wheel diameter difference. The deviation of the rotation speed of the electric motor is automatically corrected by Δf. The output of the correction means 22 is input to the minimum / maximum value selector 8 and the same processing as in the case of the first embodiment is performed.

That is, when there is a wheel diameter difference, in the prior art and the first embodiment, a difference in the number of revolutions of each induction motor with respect to the speed of the electric vehicle always occurs, so that the target number of revolutions,
It was impossible to accurately obtain the minimum rotation speed during so-called power running and the maximum rotation speed during regeneration, but in the second embodiment described above, the deviation of the wheel diameter is automatically corrected.
Further, a control device for an electric vehicle having excellent readhesion performance can be obtained.

Example 3. The third embodiment of the present invention will be described with reference to the block diagram shown in FIG. The third embodiment differs from the first embodiment in that a plurality of induction motors 6 are connected to one inverter 5. In this case as well, similar to the first embodiment, even if all of the induction motors 6 driven by the self-inverter slip into the idling or sliding state, the same effect as that of the first embodiment can be obtained.

Example 4. The fourth embodiment of the present invention will be described with reference to the block diagram shown in FIG. The fourth embodiment is the third embodiment.
The difference is that only the minimum value or the maximum value of the rotation speeds of the plurality of induction motors driven by other inverters is input to the own inverter. That is, all of the minimum rotation speed or the maximum rotation speed of the plurality of induction motors 6 in each set including the inverter 5 to the frequency control device 10 and the minimum rotation speed or the maximum rotation speed of the induction motor 6 in the other set are calculated. The minimum rotation speed or the maximum rotation speed of the induction motor 6 is obtained by the minimum / maximum value selector 8. Even with such a configuration, the third embodiment can be used.
Has the same effect as.

Embodiment 5. The fifth embodiment of the present invention will be described with reference to the block diagram shown in FIG. The fifth embodiment is different from the first embodiment in that only one of the induction motors driven by another inverter is supplied with only the rotation speeds of the first and last induction motors 6A and 6D. There is something I did. That is, among the plurality of induction motors 6A to 6D in the plurality of sets including the inverter 5 to the frequency control device 10, at the time of power running, based on the rotation speed of the rear induction motor 6A or 6D with respect to the traveling direction of the electric vehicle, At the time of regeneration, the minimum / maximum speed is determined by the minimum / maximum value selector 8 based on the speed of the induction motor 6A or 6D on the front side with respect to the traveling direction of the electric vehicle. In, the pulse generators 7A and 7D provided in the induction motors 6A and 6D are connected to the respective minimum / maximum value selectors 8.

For example, FIG. 6 shows a schematic diagram of an electric vehicle.
Wheels 23A, 23B, 23C and 23D are respectively connected to induction motors 6A, 6B, 6C and 6D in FIG. Here, with respect to the traveling direction 24, the wheels 23 are
When A is idling and regenerating, the wheels 23D are difficult to slide. On the contrary, the wheels 23D run idle during power running in the traveling direction 25, and the wheels 23A do not easily slide during regeneration. Therefore, the wheels 23A and 2 which are the most difficult to slip and slide under the conditions of power running, regeneration, and traveling direction
Since only the rotational speeds of the induction motors 6A and 6D connected to the 3D are input to the respective inverters via the minimum / maximum value selector 8, the same effect as that of the first embodiment is obtained.

In each of the first to fifth embodiments described above, the minimum / maximum value selector 8 constitutes the minimum / maximum speed detecting means of claims 1 to 5, and the frequency control device 10 is the frequency control means. Are configured. The subtracter 21 of the second embodiment constitutes the wheel diameter calculating means of the second aspect.

[0025]

As is apparent from the above description, the control device for an electric vehicle according to claim 1 of the present invention comprises a plurality of sets of one induction motor and one inverter for driving the induction motor. Applied to an electric vehicle, among the rotational speeds of the induction motor in the plurality of sets, a minimum maximum rotational speed detecting means for detecting a minimum rotational speed or a maximum rotational speed; and a minimum rotational speed according to the minimum rotational speed during power running of the electric vehicle. The output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to the output signal, and the output frequency of each inverter is controlled by a signal obtained by subtracting the predetermined slip frequency from the signal corresponding to the maximum rotation speed during regeneration. Since there is only one induction motor driven by the self-inverter, even if the induction motor runs idle or slides, another frequency control means is provided. If in driven induction motor with adhesive, because the minimum and maximum rotation speed detecting means, a minimum rotational speed at the time of power running, the maximum speed is detected at the time of regeneration,
The output frequency of the inverter does not increase more than the acceleration of the electric vehicle, and the slip frequency of the induction motor that slips immediately decreases, and the torque decreases, which facilitates re-adhesion.

The control device for an electric vehicle according to claim 2 of the present invention is applied to an electric vehicle including a plurality of sets of one induction motor and one inverter for driving the induction motor.
A wheel diameter in the electric vehicle from the deviation between the rotation speed of the induction motor driven by the inverter in one set and the rotation speed of the induction motor driven by the inverter in another set while the electric car is running. Wheel diameter calculation means for calculating the difference between the wheel diameters, correction means for correcting the rotational speed of the induction motor driven by the inverters in the other set based on the difference in the wheel diameters, and the inverters in the one set. Among the rotation speed of the induction motor and the rotation speed of the induction motor corrected by the correction means, a minimum maximum rotation speed detection means for detecting a minimum rotation speed or a maximum rotation speed, and when the electric vehicle is running, The output frequency of each of the inverters is controlled by a signal obtained by adding a predetermined slip frequency to the signal corresponding to the minimum rotation speed, and a predetermined slip from the signal corresponding to the maximum rotation speed during regeneration. Since the frequency control means for controlling the output frequency of each of the inverters is provided by the signal from which the frequency is subtracted, there is an effect that the minimum rotation speed or the maximum rotation speed can be accurately detected in addition to the operation of claim 1. .

The control device for an electric vehicle according to claim 3 of the present invention is applied to an electric vehicle including a plurality of sets of a plurality of induction motors and one inverter for driving the induction motors.
Among the rotation speeds of the induction motor in the plurality of sets, a minimum maximum rotation speed detection means for detecting a minimum rotation speed or a maximum rotation speed, and a predetermined slip in a signal according to the minimum rotation speed during power running of the electric vehicle. The output frequency of each of the inverters is controlled by a signal to which a frequency is added, and frequency control means for controlling the output frequency of each of the inverters by a signal obtained by subtracting a predetermined slip frequency from a signal according to the maximum rotation speed during regeneration. Even if the induction motor runs idle or slides, if the induction motor driven by another inverter is stuck, the minimum and maximum rotation speed detection means detects the minimum rotation speed during power running and the maximum rotation speed during regeneration. As a result, the output frequency of the inverter does not rise above the acceleration of the electric vehicle, and the slip frequency of the induction motor that spins immediately decreases. An effect that torque tends to re-adhesive so reduced.

Further, a control device for an electric vehicle according to a fourth aspect of the present invention is applied to an electric vehicle provided with a plurality of sets of a plurality of induction motors and one inverter for driving the induction motors.
Obtain the minimum or maximum speed of all induction motors from the minimum or maximum speed of the plurality of induction motors in each set and the minimum or maximum speed of the induction motors in the other sets. Minimum and maximum rotation speed detection means, at the time of power running of the electric vehicle, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed, and at the maximum rotation speed during regeneration. A frequency control means for controlling the output frequency of each of the inverters is provided by a signal obtained by subtracting a predetermined slip frequency from the corresponding signal. As in the case of claim 3, when there are a plurality of induction motors driven by the self-inverter, even if these induction motors run idle or slide, if the induction motors driven by other inverters are sticky, the minimum Since the maximum rotation speed detection means detects the minimum rotation speed during power running and the maximum rotation speed during regeneration, the output frequency of the inverter does not rise above the acceleration of the electric vehicle, and the slip frequency of the idle induction motor is short. As a result, the torque is reduced, and the effect of facilitating re-adhesion is exerted.

Furthermore, a control device for an electric vehicle according to a fifth aspect of the present invention is applied to an electric vehicle provided with a plurality of sets of an induction motor and an inverter for driving the induction motor, and a plurality of sets of the plurality of sets are used. Among the induction motors, during power running, it is based on the rotation speed of the rear induction motor with respect to the traveling direction of the electric vehicle, and during regeneration, based on the rotation speed of the front induction motor with respect to the traveling direction of the electric vehicle. A minimum maximum rotation speed detecting means for detecting the minimum rotation speed or the maximum rotation speed, and a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed during the power running of the electric vehicle. Frequency control means is provided to control the output frequency of each inverter by a signal obtained by subtracting a predetermined slip frequency from the signal corresponding to the maximum rotation speed during regeneration, and therefore, during power running. Since the minimum rotation speed or the maximum rotation speed is obtained based on the rotation speed of the induction motor connected to the wheel that is hard to idle and does not easily slide during regeneration, the configuration is simplified and the same operation as in claim 1 is achieved. Play.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device showing a first embodiment of the present invention.

FIG. 2 is a block diagram of a control device showing a second embodiment of the present invention.

FIG. 3 is a block diagram of a control device showing Embodiment 3 of the present invention.

FIG. 4 is a block diagram of a control device showing Embodiment 4 of the present invention.

FIG. 5 is a block diagram of a control device showing a fifth embodiment of the present invention.

FIG. 6 is a schematic diagram of an electric vehicle showing a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a conventional control device.

[Explanation of symbols]

 1 overhead wire 2 pantograph 3 filter reactor 4 filter capacitor 5 inverter 6,6A, 6B, 6C, 6D induction motor 7,7A, 7B, 7C, 7D pulse generator 8 minimum / maximum selector 9 adder / subtractor 10 frequency controller 21 subtraction Device 22 correction means 23A, 23B, 23C, 23D electric vehicle wheel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikio Ota 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Itami Works

Claims (5)

[Claims] 1. An induction motor and a drive unit for driving the induction motor.
In an electric vehicle equipped with a plurality of sets of one inverter, among the number of rotations of the induction motor in the plurality of sets, a minimum and maximum rotational speed detection means for detecting a minimum rotational speed or a maximum rotational speed; Sometimes, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed, and a signal obtained by subtracting a predetermined slip frequency from the signal corresponding to the maximum rotation speed during regeneration. A control device for an electric vehicle, comprising: a frequency control unit that controls an output frequency of each of the inverters. 2. One induction motor and one for driving the induction motor.
In an electric vehicle provided with a plurality of sets of one inverter, the number of revolutions of the induction motor driven by the inverters of one set while the electric vehicle is running, and the induction driven by the inverters of another set. Wheel diameter calculation means for calculating the difference in wheel diameter in the electric vehicle from the deviation from the rotation speed of the electric motor, and correction of the rotation speed of the induction motor driven by the inverter in the other set based on the difference in wheel diameter. Correction means, a minimum rotation speed of the induction motor driven by the inverters in the one set, and a minimum rotation speed of the induction motor corrected by the correction means. Maximum rotation speed detection means, and when the electric vehicle is in the power mode, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed. A control device for an electric vehicle, further comprising: frequency control means for controlling the output frequency of each inverter by a signal obtained by subtracting a predetermined slip frequency from a signal corresponding to the maximum rotation speed during regeneration. 3. A plurality of induction motors and one for driving them.
In an electric vehicle equipped with a plurality of sets of one inverter, among the number of rotations of the induction motor in the plurality of sets, a minimum and maximum rotational speed detection means for detecting a minimum rotational speed or a maximum rotational speed; Sometimes, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed, and a signal obtained by subtracting a predetermined slip frequency from the signal corresponding to the maximum rotation speed during regeneration. A control device for an electric vehicle, comprising: a frequency control unit that controls an output frequency of each of the inverters. 4. A plurality of induction motors and one for driving the induction motors.
In an electric vehicle equipped with a plurality of sets of one inverter, from the minimum rotation speed or the maximum rotation speed of the plurality of induction motors in each set, and the minimum rotation speed or the maximum rotation speed of the induction motor in the other set Minimum and maximum rotation speed detection means for obtaining the minimum rotation speed or the maximum rotation speed in all induction motors, and, during power running of the electric vehicle, each of the inverters is a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed. And a frequency control means for controlling the output frequency of each inverter by a signal obtained by subtracting a predetermined slip frequency from a signal corresponding to the maximum rotation speed during regeneration, Car controller. 5. An electric vehicle comprising a plurality of sets of an induction motor and an inverter for driving the same, wherein among the plurality of induction motors in the plurality of sets, a rear position with respect to a traveling direction of the electric vehicle during power running. Based on the number of rotations of the induction motor on the side, during regeneration, based on the number of rotations of the induction motor on the front side with respect to the traveling direction of the electric vehicle, a minimum maximum rotation speed detection means for detecting the minimum rotation speed or the maximum rotation speed. During powering of the electric vehicle, the output frequency of each inverter is controlled by a signal obtained by adding a predetermined slip frequency to a signal corresponding to the minimum rotation speed, and at the time of regeneration, a predetermined signal from the signal corresponding to the maximum rotation speed is determined. A control device for an electric vehicle, comprising: frequency control means for controlling an output frequency of each of the inverters by a signal from which a slip frequency is subtracted.