JPS62123902A - Inverter device for electric vehicle - Google Patents

Abstract

PURPOSE:To reduce an inductive interference to a ground signal facility by twisting and unifying load lines to a three-phase induction motor connected from an inverter device at regular intervals and wiring them. CONSTITUTION:Power received by a pantagraph 2 is fed to an induction motor 18 through an inverter device 4 and load lines 19-21. The load lines 19-21 are twisted and unified at the pitches of one over the even times of the length lof a loop coil for a receiving appliance and wired. Accordingly, electromagnetic inductive noises can be reduced without adding special members.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an inverter device for electric trains, and particularly to an inverter device for KJK suitable for reducing electromagnetic induction noise.

[Background of the invention]

Recently, large-capacity gate turn-off thyristors (GTO)
With the development of thyristors (called thyristors), inverter-controlled electric trains that use an induction motor as the main motor and control it with a GTO thyristor inverter device have come into practical use. This method controls the rotation speed of the induction motor by continuously changing the output frequency and output voltage of the inverter device.

FIG. 1 shows an example of the main circuit configuration of an electric train controlled by an inverter device.

In Figure 1, 1 is an overhead wire and 2 is a pantograph.

3 is a filter reactor, and 4 is an inverter device.

6 to 17 are inverters! #4 is inside, 5 is the filter capacitor, 6-11! dGT'o thyristor, 12
~17 is a freewheel diode. 18 is an induction afjjj machine, and 19 to 21 are load lines of the induction motor. The operation of the inverter is well-defined and will not be explained here.

Now, in a -f converter system #2 train, the inverter device 4 and the induction motor 18 are usually installed under the floor, and their arrangement @19 to 21 are also arranged under the floor. When these pass over the 1g equipment on the ground.

There is a problem in that the signal equipment malfunctions due to the magnetic flux generated from the wiring. This problem will be specifically explained.

In FIG. 1, three-phase alternating current with a high harmonic content flows through load lines 19-21 due to the switching operations of GTO thyristors 6-11. This current value is much larger than the signal current of ground signal equipment, which will be described later. (The relatively low-order harmonics of the switching frequency of the GTO thyristor tend to match the signal frequency.)

Figure 2 shows an example of the state of the ceremonial costume as a perspective view from above. An inverter device 4 and other control equipment (not shown) are arranged under the floor of the vehicle body 23 between the bogies 22, only one of which is shown. Further, the induction motor 18 is attached to the truck 22. Therefore, as is clear from the figure, the load lines 19 to 21 through which the three-phase alternating current with a high harmonic content flows are wired between the inverter #4 and the induction motor 18, and furthermore, within 1 (meter) from the ground. Therefore, the magnetic flux reaching the ground is extremely strong. By the way, signal equipment on electric train tracks is generally configured as follows. A closed section is provided that is insulated from other sections in terms of alternating current, a signal current of a constant frequency is passed through the rail from one end, and a power receiver is installed at the other end or at an intermediate point. If the signal current is received at the power receiving end where the power receiver is installed, it is assumed that no train will enter the blocked section. If a train enters and short-circuits between the transmitting end and the receiving end using the axle, there will be no receiving input at the receiving end, and the approach of the train will be detected based on the fact that there is no receiving input.

There are two types of power receivers: non-modulation type and modulation type. The non-modulation method converts a signal current at a constant frequency into a DC voltage through door wave detection, and operates when the frequency of the noise input matches the reception frequency, and the reception sensitivity is generally high, making it relatively weak against noise.

A modulation method is a signal in which a carrier wave is modulated with a code wave of a lower frequency.
After the F-wave is detected, it is converted into a DC voltage, and is relatively resistant to noise. The signal frequency of both non-modulated and modulated signals is generally 1 (KH2) to several tens of kilohertz (KHz), and the modulated code wave is 10 to 50 (Hz). Further, the signal current value is 10 to 100100 (.

Figure 3 shows the configuration of the power receiver. In FIG. 3, 24 is a rail, 25 is a loop coil, 18 is a signal current, φg is a signal magnetic flux, R is a power receiver, r eO is an output voltage, and el is a received power voltage. The operation is as follows. The magnetic flux φB generated by the signal current ig flowing through the rail 24 is connected to the loop coil 2.
5, the receiving voltage el is applied to the receiving device. The power receiver R uses a modulation method, and uses a wave detector and a detection circuit with a carrier wave frequency of 2.3 KHz and a code wave frequency of 20 Hz to obtain a DC output eO from the received power voltage eR to drive the relays R and L. Generally, the minimum operating voltage of relay RL is approximately 5V.

The release voltage is about 2.5v. Considering the safety of the ground signal equipment f, the electromagnetic induction noise voltage e (1 is less than 1/2 of the release voltage of the relay RL) generated from the main circuit wiring of the inverter device to the power receiver.

It is necessary to keep it below 1.25V.

In trains that use semiconductor switching elements, a commonly used method to reduce the amount of electromagnetic noise generated is to attach a T-wire for reciprocating current, or to twist it together ( For example, Tokuko Sho 58-2
9681). However, in an inverter-controlled electric train, factors such as the current phase of the three load lines being different and the frequency changing continuously overlap, so it is difficult to simply add the load lines.
There is a problem in that the amount of electromagnetic noise generated cannot be significantly reduced even by twisting or twisting.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inverter device for electric trains that causes less induction interference to ground signal equipment.

[Summary of the Invention] In the present invention, by changing the twist pitch of the load line of a three-phase induction electric machine, the electromagnetic induction noise voltage e (, , confirm that the magnetic induction noise '1 pressure eQ is minimized at each point where the twist pitch P of the load line is an even number of the length t in the direction parallel to the rail of the receiver loop coil, and detect induction disturbances. Figure 4 shows the experimental results, where the load current was 700A and the frequency was 0 to 100.
It shows the maximum value in the Hz range.

[Embodiments of the invention]

A schematic diagram of one embodiment of the invention is shown in FIG. In the figure.

The part surrounded by the broken line is where the load wires 19 to 21 in FIG. 2 are twisted and wired at one pitch other than an even number of length t of the loop coil. 6 is an enlarged view of section A in FIG. 5.

It is possible to further reduce electromagnetic induction noise by further inserting and wiring the above-mentioned load lines 19 to 21 into a duct made of a non-magnetic material with low electrical resistance, such as aluminum.

According to the present embodiment described above, it is economical because electromagnetic induction noise can be reduced without adding any special members. Also, wiring work is easy.

〔Effect of the invention〕

According to the present invention, electromagnetic induction noise to ground signal equipment can be greatly reduced, so that inverter trains can be safely operated without causing guidance disturbances even on existing lines where highly sensitive signal equipment is installed. can be provided.

[Brief explanation of drawings]

Fig. 1 is a main circuit configuration diagram of an inverter device, Fig. 2 is a diagram showing an example of an underfloor wiring state, Fig. 3 is a diagram showing the configuration of a power receiver, and Fig. 4 is a diagram showing an example of experimental results. FIG. 5 is a diagram showing an embodiment of the present invention, and FIG. 6 is an enlarged view of section A in FIG. 4... Inverter device, 18... 3-phase induction motor. 19.20.21...Load line, 24...Track rail. 25...Loop coil, t...Length of the loop coil.

Claims (1)

[Claims] In a train inverter device that drives a 1- and 3-phase induction motor, the load line from this inverter device to the 3-phase induction motor connected is connected to the power receiver loop of the ground signal equipment installed between the track rails. A train inverter device characterized in that the wires are twisted together at a pitch that is an even number of the length of the coils in the direction parallel to the track rail.