JPS59127504A - Controller for driving motor - Google Patents

Abstract

PURPOSE:To obtain the driving operation state of a vehicle by providing a plurality of switch elements, a current limiting safety unit and a current detector, thereby effectively controlling the driving of a motor even when one phase becomes defective. CONSTITUTION:A motor 13 is controlled by polyphase multiplex chopper via power transistors 15a, 15b...15n which become switch elements. Fuses 14a, 14b ...14n to become safety units for limiting overcurrents are respectively connected in series with the transistors 15a, 15...15n. Current detectors 18a, 18b...18n are respectively provided in the circuits of the phases corresponding to the transistors 15a, 15b...15n, to detect currents flowed in the respective phases. Base signal generators 22a, 22b...22n respectively apply base signals to the transistors 15a, 15b...15n of the respective phases in response to the command from a phase distribution controller 23 to control the conductions. In this case, the transistors 15a, 15b...15n are protected against the overcurrents which exceed the maximum currents.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a driving electric motor used as a power source for an electric vehicle.

As a power source for electric cars, for example, Cho! An electric motor device whose rotational speed is freely controlled is used. Figure 1 shows an example of the motor control circuit.
For each battery power source installed in a car, there is a small amount of power, such as a thyristor or a power lannosta.
An electric motor 13 for traveling is connected via a 12-wire connector. By controlling the darts of the first and second darts 12, the electric power supplied to the electric motor 13 is controlled, and the driving operation of the automobile is controlled. In this case, the power supply circuit of the motor 13 includes a fuse 1 as a safety device to limit overcurrent.
Insert 4 in series.

However, in such a motor 130 control circuit,
If the fuse 14 blows out or the fuse 12 is destroyed for some reason, the electric motor 13 will become inoperable, making it difficult for the car to take emergency evacuation action.

Therefore, it has been considered to use a multiphase chopper as shown in FIG. 2 as a control means for such an electric motor for an automobile. That is, a plurality of power transistors 15a, 15b are connected between the electric motor 13 and the battery power source.
... are provided in parallel, and these Tran Zosta 15a, 15b
- Each pace is controlled by a phase control means (not shown). In the figure, 16a, 16b, .
17b... is a freewheel diode.

With this configuration, even if the power transistor of one of the multiple phases is destroyed for some reason, the motor 13 can be driven and controlled by the remaining phases. In such a case where destruction occurs in a certain phase, overload is applied to the remaining phases, and the power transistors of the remaining phases may be destroyed one after another.

The present invention has been made in view of the above points, and it is possible to reliably drive and control the electric motor even if a failure occurs in, for example, a part of the control unit for the electric motor using a multi-phase multiplex control unit. It is an object of the present invention to provide a driving motor control device for an electric vehicle that ensures the running state of the vehicle.

That is, the motor control device according to the present invention configures a polyphase multiplexed selector P with a plurality of switch elements, detects the current flowing through each switch element, and controls the maximum current of each phase. Each of the plurality of switch elements is controlled separately.

An embodiment of the present invention will be described below with reference to the drawings. Figure 3 shows its configuration, and as in the case of Figure 2,
The electric motor 13 has a power transistor 1 which serves as a switching element.
5a, 15b, . . . The power transistors 15a, 15b of each phase are connected to fuses I4a, 14b, which serve as safety devices for limiting overcurrent.
... are connected in series.

Each phase circuit corresponding to the power transistors 15a, 15b... has a current detector 18a, respectively.
, l1lb... are provided to detect the current flowing through each phase. The current detection signals from these current detectors 18a, 18b, respectively, are transmitted to amplifiers 19a, 1, respectively.
After being amplified by 9b..., it is supplied to comparators 20a, 20b.

The comparators 20a, 20b... have a maximum current setting device 2.
The set current signal from 1 is supplied as a comparison current signal, and the comparators 20a, 20b, etc. compare the set current signal with the detected current signal from each corresponding current detector 18a, 18b, etc.
The results of this comparison are applied to the pace signal generators 22m, 22b...
・Supplied as a control signal to

The pace signal generators 22a, 22b... give pace signals to the A-two transistors 15h, 15b... of each phase in response to commands from the phase distribution controller 23, and these transistors 15a, 15b...・Continuity control for each. In this case, when it is determined in the comparators 20m, 20b, etc. that the detected current signal exceeds the set maximum current signal, a pace signal prohibition command is given to the corresponding pace signal generator, Zosta 1
5a.

15b... Each is protected against overcurrent exceeding the maximum current.

That is, if the power transformer of one phase is destroyed or the fuse of one phase is blown for some reason, the electric motor 13 is driven by the remaining phase, and the vehicle is enabled to make an evacuation run. In this case, a large current will flow through the 1000W 7 trunk transistors, etc. of the remaining phases, but this excessive current state is detected by each Japanese food, and the pace signal of the nosower transistor of that phase is detected. Become in control. Therefore, a state is set in which only a current less than the capacity flows through each of the four-power transistors, and the state in which the other phases are successively destroyed is reliably protected, and the drive control state of the motor 13 is ensured. The state will be as follows. In this case, the motor current decreases, but
It is possible to move a car in an emergency.

In the above embodiment, when a fault occurs in a certain phase, the remaining faulty phases are used to drive the motor, and
The maximum amount of current in each phase at that time was set to ensure circuit protection. However, it would be more effective if the remaining normal phases were used to construct a multiphase multiplexer.

FIG. 4 shows an embodiment for the above case, in which the detection signals from the current detectors 18a, 18b, etc. connected in series with the power transistors 15a, 15b, etc. of each phase are used for phase distribution control. It is supplied to the container 23. Based on this current detection signal, the controller 23 detects when an accident such as a transistor breakdown or a fuse blowout occurs in a certain phase, and the controller 23 detects the occurrence of an accident such as a transistor breakdown or a fuse blowout in a certain phase. Control is performed by distributing the phase as a multi-phase multiple chopper.

In other words, the ability of the remaining transistors of a plurality of phases, which are free from accidents such as destruction, can be brought out to the maximum extent, thereby making it possible to move the automobile. In this case, in response to the failure detection of the phase distribution controller 23, the abnormality detection indicator 2
4, it is possible to reliably notify the driver of the occurrence of a fault such as a fuse blowout.

In FIG. 4, the same components as those in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted.

Fig. 5 shows the operating waveforms when the device shown in Fig. 4 is used as a three-phase triple chopper, and shows the states of the currents 17 and i2.13 flowing through each of the three-phase power transistors. There is. i(7 is the drive current applied to the motor 13.

If the first phase transistor of the three-phase triplex transistor 9 is destroyed and the transistor current 1) no longer flows, the phase distribution controller 23 detects this, and the phase distribution controller 23 detects this as shown in FIG. In this way, only the second-phase and third-phase transistor circuits are used to operate as a two-phase double-choice motherboard.

As described above, according to the present invention, when controlling a motor using a multi-phase multiple chopper, even if a failure occurs in one of the phases, the motor can still be operated and controlled; The spread of failures can also be effectively prevented. Therefore, it can be effectively applied as a motor control device as a single cord for automobiles.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams explaining conventional motor control devices, FIG. 3 is a circuit diagram explaining a motor control device according to an embodiment of the present invention, and FIG. 4 is a circuit diagram illustrating a motor control device according to an embodiment of the present invention. Circuit diagrams illustrating the embodiment of the present invention, FIGS. 5 and 6
The figure is an operation waveform diagram illustrating the state of the control current in the above embodiment. 1 No...Battery power supply, 13...Electric motor, 14h, 14
b... Fuyuzu, 15h, 15b...
Nozzle transistor, 18*, 18b... Current detector, 22a, 22b... Pace signal generator, 23... Phase distribution controller.

Claims (2)

[Claims] (1) A plurality of switch elements provided corresponding to each phase constituting a multi-phase multiplex switch of a traveling electric motor, and a plurality of current-limiting safety devices provided in series with each of the switch elements; A plurality of current detectors detect the amount of current flowing in each of the above phases, and phase distribution is performed by controlling the maximum current of the switch elements of each phase based on the detected current of each phase from the current detectors. What is claimed is: 1. A driving electric motor control device comprising: control means for controlling conduction. (2) The control means for performing the phase distribution includes a phase distribution function that detects a phase in which a plow abnormality exists based on the detection current corresponding to each phase, and performs multiphase multiplex control using the remaining p phases. An electric motor control device according to claim 1, wherein the electric motor control device is configured as follows.