JP2823400B2 - Main circuit opener device of electric car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main circuit opener device for an electric vehicle, and more particularly to a main circuit opener device for an electric vehicle suitable for use in a control device of an electric locomotive and a train control device.

[0002]

2. Description of the Related Art As a conventional technique relating to an electric vehicle control apparatus, for example, a technique described in Japanese Patent Application No. 63-120480 is known.

In this prior art, a plurality of (for example, eight) induction motors are connected to one inverter device,
A plurality of induction motors are driven by one inverter device. In this prior art, a main circuit opener is provided between a unit switch (line switch) and a current collector (pantograph), and DC power is supplied to the inverter from an overhead line.

In this prior art, when one inverter device fails for some reason, the main circuit opener provided in the power supply line of the inverter device is opened, so that all of the plurality of induction motors are opened. However, there is a problem that it cannot be driven.

As another conventional technique capable of solving such a problem, there is a method of driving one induction motor by one inverter device. In this case, if one main circuit opener is provided for a plurality of inverter devices, the above-mentioned problem cannot be solved.
One main circuit opener is provided for one inverter device.

[0006] This method is divided into one controller (1C), one controller (1C) and one controller (1C).
It is called an electric motor (1M) system, that is, a 1C / 1M system.

[0007]

In the control of an electric car according to the 1C / 1M system, even if one of the inverter devices as a controller should fail, the failed device is disconnected and another healthy inverter device is disconnected. And an induction motor can be utilized.

However, this prior art requires a large number of main circuit openers, and the large number of main circuit openers are constituted by tooth switches and the like, and are provided so as to operate in the atmosphere. Manual opening requires a lot of trouble, and there is a problem that safety in an electric fire is not considered when used in a deep subway or the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a main circuit opener device for an electric vehicle having a main circuit opener capable of solving the problems of the prior art, improving the handleability, and having high safety. To provide.

[0010]

According to the present invention, an object of the present invention is to form a main circuit opener provided in each main circuit (inverter device) using a non-air contact, that is, a vacuum valve contact. In addition, by ensuring safety against electric fire, and by enabling remote operation to improve handling, it is also possible to maintain the state of turning on or off the main circuit opener. This is achieved by performing the switching mechanically and electrically, thereby improving reliability and saving power.

[0011]

According to the present invention, a vacuum valve contact is used as an electrical contact of the main circuit opener device, a spring bending force is used for holding the closed state, and an electromagnetic force of the coil is used for operating the open state.
Since the mechanical lock is used for holding the open state and the coil is re-excited for the operation to the closed state, it is extremely easy to remotely control the coil, and furthermore, the safety is improved. Thus, a highly reliable main circuit opener device for an electric vehicle can be provided.

Further, since the main circuit opener device according to the present invention is inserted between the load side of the high-speed circuit breaker of the 1C / 1M circuit and the individual inverter devices,
When a fault occurs in the inverter device, only the faulty inverter device can be disconnected together with a small number of motors connected to the inverter device, so that the effect on the entire train control can be reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an electric vehicle main circuit opener according to an embodiment of the present invention.

FIG. 1 is a block diagram showing the configuration of an embodiment of an electric vehicle according to the present invention, FIG. 2 is a diagram showing the structure of a remote-controlled main circuit opener employing vacuum valve contacts, and FIG. FIG. 3 is a diagram illustrating an example of an excitation circuit. 1 and 2, 1 is a current collector, 2 is a main circuit fuse, 3 is a line switch, 4 is a high speed circuit breaker, 5 is a filter reactor, 6 is a filter capacitor, 7 is a main circuit opener, 8
Is an inverter device, 9 is an induction motor, 10 is a vacuum valve contact, 10a is a fixed electrode, 10b is a movable electrode, 10c is a metal bellows, 11 is a compression spring, 12 is a suction core, 13
Is an operation coil, 14 is a fixed iron core, 15 is a yoke, 18 is a lever, 19 is a cam, and 21 and 22 are springs.

As shown in FIG. 1, the electric vehicle according to the present invention includes a current collector 1, a main circuit fuse 2, two line switches 3, a high-speed circuit breaker 4, a filter reactor 5, and a filter capacitor 6. A plurality of (four in the illustrated example) inverter devices 8 are supplied with direct-current power from overhead lines.
Is configured to be supplied. The main circuit openers 7 that can be operated by the operation coils 13 are independently inserted into each of the inverter devices 8. Further, each inverter device 8 independently controls and drives one induction motor 9, but the number of induction motors driven by one inverter device may be two.

The main circuit opener 7 can be driven from the closed state to the open state or from the open state to the closed state by short-time excitation of the operating coil 13, and holds the closed state. Both the opening and the holding of the open state can be performed mechanically. Hereinafter, the structure of the main circuit opener 7 will be described with reference to FIG.

FIG. 2A shows the closed state of the main circuit opener 7, and the main circuit opener 7 is connected to the vacuum valve contact 10
, An electromagnetic operation unit, and a mechanical holding unit. The vacuum valve contact 10 is connected to the fixed electrode 10a,
Yes electrokinetic electrode 10b, which is constituted by a metal bellows 10c, the movable electrode 10b is deflection of the compression spring 11 is raised by the reaction force to contact the fixed electrode 10a.

The electromagnetic operation unit includes an attraction iron core 12, an operation coil 13, a fixed iron core 14, and a yoke 15 connected to the movable electrode 10b.
By exciting the battery 17 by the operation of 6, the main circuit opener 7 can be driven from the closed state to the open state or from the open state to the closed state. The mechanical holding part includes a lever 18 connected to the fixed iron core 14 and a cam 19.
And springs 21 and 22. A roller 23 is provided at the tip of the lever 18, and the roller 2
3 is connected to a guide hole 19 a provided in the cam 19.

Next, the operation of the main circuit opener 7 configured as described above will be described.

In the state shown in FIG. 2A, when the coil 13 is excited by the switch 16 for a short time with the battery 17,
Suction core 12 descends by a stroke S _1.

At this time, the roller 23 provided at the tip of the lever 18 connected to the suction iron core 12 via the fixed iron core 14 has the shaft 20 because the lever 18 is constantly pulled clockwise by the spring 22. Accordingly, the cam 19 moves along the wall surface of the guide hole 19a as shown by the arrow 19b without coming off the guide hole 19a of the cam 19 rotatably supported. Further, the cam 19 always tries to rotate counterclockwise about the shaft 20 by the spring 21. For this reason,
When the suction core 12 is lowered by the stroke S _1, 2
The roller 2 provided at the tip of the lever 18 as shown in FIG.
3 is settled at the lock position of the guide hole 19a.

In this state, even if the excitation of the operation coil 13 is stopped, the open state of the main circuit opener 7 is maintained.

In the above description, the stroke S ₁ of the suction core 12, the distance S ₂ between the center positions of the rollers 23 in the open state and the closed state of the main circuit opener 7,
The upper end and the distance S ₃ between the position A on the wall surface of the guide hole 19a of the cam 19 of the roller 23 in the open state of, S _1> S ₂
+ It has been set so as to be in the relationship of S _3.

Next, from the opened state, the operating coil 1 is again turned on.
When 3 is excited, the attraction iron core 12 is lowered from the position in FIG. 2B by S ₁ − (S ₂ + S ₃ ). At this time, the roller 23 contacts the inner wall surface 19c of the cam 19 and rotates the cam 19 clockwise against the spring 21.
By this rotation, the roller 23 is disengaged from the locked position of the guide hole 19a, and the lever 18 is released from the restraint and moves upward together with the suction core 12 by the bending reaction force of the compression spring 11,
The movable electrode 10b contacts the fixed electrode 10a. That is, the main circuit opener 7 is turned on as shown in FIG.

The above-described series of operations of the main circuit switch can be repeatedly repeated by exciting the operation coil 13.

The configuration of the mechanical holding portion according to the above-described embodiment of the present invention is merely an example, and the present invention
Fixed electrode 10a and movable electrode 10b of vacuum valve contact 10
It is only necessary to be able to mechanically maintain the state of contact and non-contact with the substrate. As described above, as a holding structure of a mechanical system that locks with one operation force and further unlocks by applying an operation force in the same direction, for example, there is a structure of a ball-point pen knob, a push-button switch, and the like. A device that performs such an operation is also known. Further, there is an example of a push clutch or a push latch for a case box.

In the above-described embodiment of the present invention, the electromagnetic driving by the operation coil is performed. However, the driving may be performed by another method, for example, by an electric motor or the like.

In the above-described embodiment of the present invention, the operation coil may be driven in any direction using the DC voltage applied to the operation coil. Since residual magnetism is generated in the yoke 14, the yoke 15, and the like, it is preferable to change the excitation polarity of the coil according to the operation direction.

FIG. 3 shows an example of an exciting circuit that can be used in such a case.

In FIG. 3, one operation coil 13 is
A contact 16b of a two-position switch 16a having a neutral point,
16b or by closing contacts 16c, 1c
6c is excited in the opposite direction. And
By driving the operation coils 13 in different excitation directions, the main circuit opener 7 can be driven from the closed state to the open state or vice versa.

As described above, according to the embodiment of the present invention, the main circuit opener can be turned on or off by a mechanical mechanism by using a vacuum valve contact, and it can be electrically connected. It is possible to prevent malfunction due to disconnection as compared with a holding method, for example, when using an electromagnetic contactor.

In general, since the main circuit opener does not have a current interrupting capability, there is a risk of causing an electric fire due to malfunction. For this reason, it is not preferable to use a method in which the electrode is turned on by the constant excitation method, or any method in which the contact is opened by the constant excitation method. Since the vacuum valve contact does not have a DC blocking capability, it is not preferable in terms of reliability because a malfunction is caused by disconnection if a constant excitation method or a method of opening the electrode is adopted.

In the above-described embodiment of the present invention, the switching operation of the holding state between the closed state and the open state may be performed by exciting the drive coil for a time sufficient for performing the switching operation, for example, for a short time of about 250 milliseconds. Therefore, it is possible to reduce power consumption and improve reliability without causing the above-described malfunction. In addition, it is easy to remotely control the drive coil, and it can be performed with high reliability.

Further, in the above-described embodiment of the present invention, since the operation in both directions can be performed only by providing one operation coil as the electric system, the normal operation in which the closing and opening are performed using two coils is performed. Compared to the method used, the structure can be simplified and the number of parts can be reduced, so that both economy and reliability can be improved.

In the embodiment of the present invention described above, the closing and opening commands can be clearly separated in control by making the closing and opening of the operation coil by inverting the excitation polarity of the operation coil. , A suction core 12, which constitutes the electromagnetic unit,
The generation of residual magnetism in the fixed iron core 14 and the yoke 15 can also be prevented. As a result, each time the excitation is performed by reversing the polarity, the magnetism once becomes zero, and the magnetic flux rises with the newly excited polarity.Therefore, the operation is stable without being affected by the current change required for the operation. Can be performed.

[0036]

As described above, according to the present invention, since the holding mechanism in each of the closing and opening states is constituted by a mechanical system, a malfunction such as a holding mechanism by an electric system which needs to be constantly excited. And the overall safety and reliability of the electric vehicle can be improved. In addition, since remote control can be easily performed, handling can be improved by performing remote control.

Further, according to the present invention, since a vacuum valve contact is used, the safety against electric fire can be greatly improved. Since the above two operations can be performed, the mechanism can be simplified, and the economy, reliability, and power saving can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electric vehicle according to the present invention.

FIG. 2 is a view showing the structure of a remote-controlled main circuit opener employing a vacuum valve contact.

FIG. 3 is a diagram illustrating an example of an excitation circuit of an operation coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current collector 2 Main circuit fuse 3 Line switch 4 High speed circuit breaker 5 Filter reactor 6 Filter capacitor 7 Main circuit opener 8 Inverter device 9 Induction motor 10 Vacuum valve contact 11 Compression spring 12 Suction core 13 Operating coil 14 Fixed core 18 Lever 19 Cam 21, 22 Spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60L 9/18 B60L 3/00 B60L 15/00

Claims (4)

(57) [Claims] 1. An electric vehicle including one circuit breaker and a plurality of inverters receiving power supply via the circuit breaker, wherein an electric vehicle includes a main circuit corresponding to each of the plurality of inverters. A circuit opener is provided. The main circuit opener mechanically holds the closed state and the open state, and switches between the closed state and the open state and the two types of state switching from the open state to the closed state. A main circuit opener device for an electric vehicle, wherein the control is performed electrically. 2. The main circuit opener device for an electric vehicle according to claim 1, wherein a vacuum valve contact is used as an electric contact of said main circuit opener. 3. The mechanical holding of each of the closed state and the open state is performed by two mechanical systems, a mechanism for holding the closed state and a mechanism for holding the open state. The main circuit opener device for an electric vehicle according to claim 1 or 2, wherein the main circuit opener device is performed by excitation of one electric system. 4. The main circuit of an electric vehicle according to claim 3, wherein the electric system is a system having a drive coil, and the two types of state switching are performed by changing an excitation polarity of the drive coil. Opener device.