JPS5858802A - Chopper controlled electric motor vehicle - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an induction defect by disposing a main smoothing reactor forming a pair of chopper circuits having phase difference of 180 deg. symmetrically to the center line of a body under the body and arranging a shielding plate at the lower side of the reactor. CONSTITUTION:Chopper circuits CH1, CH2 which are operated with the phase difference of 180 deg. from each other are provided. Main smoothing reactors MSL1, MSL2 are disposed at the position symmetrical to the center line 0 of a body B at the central axis of each coil under the floor of the body B, and a shielding plate Sh made of conductors is arranged at the lower side of the reactors. In this manner, the occurrence of the induction defect based on the reactors can be effectively preented, and the cooling of the reactors can be smoothly and efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of electric cars driven by four-way control, and the present invention relates to a chopper that reduces electromagnetic induction interference caused by chopper control to 1% and prevents malfunctions in the control of electric cars. This relates to a controlled electric vehicle.

In electric vehicles, etc., a chopper control method is used to improve the efficiency of speed control when moving and to improve riding comfort.In addition, this chopper control method performs regenerative braking during braking to reduce power consumption. We are trying to

However, in this type of chopper-controlled electric vehicle, a thyristor switch is generally used to turn on and off the current, and a current containing many harmonic components flows through the main circuit. If tflt containing many such harmonic components flows out onto overhead wires or rails, communication equipment and ground signal equipment may be disturbed and malfunction. This interference was generally regarded as an inductive disturbance, but today it has been solved by installing a filter reactor and a filter capacitor on the power supply side of the electric vehicle to limit the outflow of harmonic current components. .

In addition, one of the induction disturbances in the chopper-controlled electric car of this woodcutter is 1. For example, the magnetic flux leaking from the main smoothing reactor installed under the floor of the electric car interlinks with the loop surrounded by the rail and axle, causing a disturbance voltage between the left and right rails. It may be caused by the occurrence of. This disturbance voltage also contains an abundance of harmonic components (Kt), and in particular, the level crossing controller is greatly affected by this disturbance voltage.

There is a high possibility that static movement will occur in the level crossing controller.

Therefore, an effective countermeasure against this interference voltage is desired.

Note that in conventional chopper-controlled electric cars, the filter reactor is also generally installed under the floor of the electric car, but in order to suppress the harmonic pull component of the overhead line current to below a specified value such as Jp, this reactor is sufficiently installed. Since a large filter time constant is set, the influence of the filter reactor can be ignored in terms of inductive disturbances.

FIG. 1 shows the principle of occurrence of induction disturbances in the conventional chopper-controlled electric vehicle mentioned above. That is, the first
In the figure, reference symbol R is the rail, M is the axle, L is the main smoothing reactor installed under the floor of the electric car, l is the level crossing controller, Ti is the input terminal of the level crossing controller, and To is the level crossing controller's input terminal. output terminal, and X indicates a relay, #I/as is clear from the figure, the main smoothing reactor L.

The magnetic flux Φ, Φ caused by L is the magnetic flux Φ, Φ caused by the pair of rails R, R
and the axles AX and AI located in the front and rear.
It interlinks with the loop formed once. Also, this magnetic flux Φ
changes over time, so the loop has dΦ/
A voltage di is induced, and a current consisting of the voltage dΦ/dt divided by the rail RO impedance flows in this loop.

As a result, a voltage is generated between the left and right rails R, R.

Level crossing controllers are usually used for the purpose of controlling both crossings and detect when a train is present in a specific section.
In the case of "train opening", relay X operates and "train opening" occurs.
In this case, relay X operates to be "released". In this case, the voltage dΦ/dt is small, for example, if the vehicle is not provided with the axle L, or even if the axle L is provided, the leakage flux of the harmonic component is small.

Therefore, the voltage between the left and right rails, that is, the voltage applied between the large input terminal Ti of the level crossing controller KO, has a value that is sufficiently smaller than the sensitive voltage of the level crossing controller, and the relay X is appropriately released. However, the leakage magnetic flux of harmonic components in the reactor installed under the floor of the vehicle is large, and the voltage dΦ / exceeding the level crossing controller KO sensitive voltage between the left and right rails is
When dt occurs, there is a delay in which the relay X is activated despite the "train rest" condition.

To solve this problem, for example, as shown in Figure 1, a tracing plate sb t- is placed on both sides of the reactor L.
The first option is to suppress the magnetic flux ψ leaking from the reactor L to the outside by arranging the , as shown in Figure 3,
It is also possible to arrange the reactor L so that its center axis is parallel to the longitudinal direction of the rail R so that the magnetic flux Φ generated by the reactor L does not interlink with the left and right rails R, but in this case, However, it also has the disadvantage of being restricted in terms of cooling or mounting.

Therefore, the inventors of the present invention have conducted various studies in order to obtain means that can effectively prevent various types of damage caused by the above-mentioned conventional chopper-controlled electric vehicles. In nine chopper-controlled electric vehicles, each of which is configured to operate in a phased manner,
The main smoothing reactor of the chopper circuit, which is operated with a phase difference of
By arranging them symmetrically, it effectively prevents the magnetic flux of odd-order or even-order harmonic components occurring in the main smoothing reactor from interlinking with the loop formed by the pair of rails and the axle. In addition, a bell shielding plate made of a conductor is horizontally arranged on the lower side of the main smooth sliding axle. ! Interlinkage of the magnetic flux of the iI wave component can be effectively reduced.

9. It has been found that the problem regarding the I4 failure in the conventional chopper-controlled electric vehicle can be solved.

Therefore, an object of the present invention is to effectively prevent the occurrence of casting defects due to the main smoothing reactor in a chopper-controlled electric unit, and to achieve smooth and efficient cooling and cooling of the main smoothing reactor. Kamaru Chopper 1iIII
I'm here to provide electricity.

In order to achieve the above object, in the present invention, in a chopper control electric unit configured to connect an even number of chopper circuits ji& in parallel and operate with a phase difference between them, a pair of choppers A5jJ that makes the phase difference of lzaOo 1 is used. The main smooth sliding axles that make up the road are placed at the bottom of the car body in symmetrical positions with respect to the center line of the car body, and bell shield plates made of conductors are placed below these main smoothing reactors. It is characterized by

In the chopper-controlled electric vehicle described above, it is preferable that the pair of main flat sliding axles arranged symmetrically with respect to the center line of the vehicle body are oriented on the same axis with the center axes of each coil perpendicular to the center line of the vehicle body. It is.

Further, the pair of main flat sliding axles arranged symmetrically with respect to the centerline of the vehicle body can be differentially connected or harmonically connected to each other.

Next, embodiments of a chopper-controlled electric vehicle according to the present invention will be described in detail below with reference to the accompanying drawings.

The side drawings and FIG. 5 each show one embodiment of the chopper circuit configuration and the vehicle body configuration arrangement of the chopper-controlled electric vehicle according to the present invention.

First, in the chopper-controlled electric vehicle of the present invention, it is a condition that two or more even-numbered chopper circuits are arranged. The embodiment shown in FIG.

Two chopper circuits are provided, and each chopper circuit is
This figure shows a λ-phase single chopper circuit operated with a phase difference of to'. In other words, in the figure ``slg'', reference symbol - Pan tag 27 that supplies power from the pH overhead wire T.
．． PL is film capacitor 4, FC is film capacitor 1M/.

M is a DC motor, M8L/, MAL are main smoothing reactors, CH/, CH2 are choppers, FWD/.

FWD- indicates a freewheel diode.

This figure shows the main circuit configuration of a chopper-controlled electric vehicle when it moves. However, the Tsuchihira e-reactors MAL/ and MfiLJ configured in this way are each % of the vehicle body B.
Jg- is arranged in a KW configuration as shown in the figure. That is, in FIG. 5, the smoothing reactor MSL/ , M8L2
The coils are positioned under the frame of the unit B on the j-axis H, where the center axis of each coil is perpendicular to the center line 0 of the car body B, and arranged symmetrically with respect to the center line 0 of the car body B. .

Furthermore, the main smoothing reactor MSL/
A spoon shielding plate Sh made of a conductor is horizontally arranged on the lower side of the MSL, facing the rails R, R.

Next, the chotsuha Il according to the present invention configured as described above will be described.
The operation of the control cage wheel will be explained.

First, in the present invention, by providing an even number of chopper circuits and configuring these chopper circuits to operate out of phase with each other, harmonic current components flowing into the overhead wire T can be reduced. It is also implemented in conventional chopper-controlled electric vehicles.

However, the present invention is characterized in that the main smoothing reactors M8L and M8L constituting the chopper circuit consisting of two circuits having a phase difference of "iro" are arranged symmetrically under the floor of the vehicle body B as described above. In this case, the main smoothing reactors MSL/, M8L are shown in FIG. 4 (islands).

A current 'MIiL, +1°L2 having a phase difference of "iro" flows having a basic waveform as shown in (b).

When these currents 'MSLI l iゎL2 are expanded into a 7 series, the following equation is obtained.

10・・・・・・・・・） ・・・・・・
... (1)-......)
・・・・・・・・・(2) However, ID! Average DC current I2: Current pull width α: Conductivity factor ω0 = Chopper elementary angular frequency If we compare the above formula +1) and (2), the current iMAL
For T and 'MIL2, the odd-numbered harmonics are in phase.

It is clear that the even-numbered harmonics are out of phase.

Therefore, the magnetic flux Φ1. generated based on these currents 1M1L11'MaL2. The phase of Φ2 is also the same as above.

In such a state 9, the main smoothing reactor MSL/
, MSL, 2 is the center *O of the vehicle body B as shown in FIG.
symmetrically arranged with respect to K, and each main smoothing reactor M8L
/ , if the MSLs are connected so that the directions of their DC magnetic fluxes are opposite, these main flat sliding axles MA
The magnetic flux based on L/, M8L is 1 as shown in Figure 7.
Magnetic flux Φ of odd-order high-order wave component. occurs as shown by the broken line, and magnetic flux Φ6 of even-order harmonic components occurs as shown by the solid line. In this case, the magnetic flux Φ of odd harmonic components. does not interlink with the loop formed by the rails R, R and the axles X, X (see Figure 1), so this magnetic flux Φ is present in the loop. No current flows. Therefore, the rail-to-rail voltage does not include odd harmonic components.

On the other hand, the magnetic flux Φ of even harmonic components. interlinks with the loop, and current flows through the loop due to this magnetic flux Φ, so the inter-rail voltage includes even-order harmonic components. Thus, in the present invention, the main smoothing reactor M8L/.

By arranging MSL- symmetrically with respect to the center ll1lO of the vehicle body B, it is possible to remove odd harmonic components of the voltage between the rails, and for this reason, the main smoothing reactor M
The mounting positions of SL/, MSL, and 2 with respect to the vehicle body B are extremely important. That is, main smoothing reactor M8L/
, M8Lλ with respect to the vehicle body B deviates from the symmetrical position, so that the inter-rail voltage includes odd harmonic components.

Further, the magnetic flux Φ of the even-order harmonic components. In contrast, in the present invention, a shielding plate sb made of a conductor is provided on the lower surface of the main flat sliding axle MSL/, MAL-, thereby preventing the influence on the voltage between the rails. That is, as is clear from the figure, the shielding plate sb of the conductor has:
Magnetic flux ψ of even-order harmonic components generated by each main smoothing reactor MAL/, MSL. passes through, and a magnetic flux Φ is inside this unbound shield plate sh.

This change causes an eddy current, and this eddy current acts to cancel the generated magnetic flux and the original magnetic flux Φ8, and the shielding plate sh
The magnetic flux Φ6 of even-order harmonic components that passes through and reaches the surface of the rail 8 becomes extremely small. Therefore, even-order harmonic components of the rail-to-rail voltage can be made sufficiently small.゛As is clear from the above, according to this embodiment, all harmonic component voltages generated between the rails can be removed or significantly reduced, and induction disturbances to ground signal equipment can be effectively prevented. I can do it.

In addition, in the above embodiment, the main smoothing reactor MSL/
Regarding the connection of M8L2, we have explained the case where the ILIL magnetic fluxes are connected in opposite directions (differential connection), but it is also connected so that the directions of the DC magnetic flux are in the same direction (harmonic connection). ) is also possible. In this case, the relationship between the magnetic flux of odd-order harmonic components and the magnetic flux of even-number harmonic components is opposite, and the main flat-slip axle M8L/.

The symmetrical arrangement of M8Lλ prevents the even-order high logic wave component magnetic flux from affecting the rail-to-rail voltage.

Furthermore, by providing the shielding plate sh made of a conductor, it is possible to prevent the influence of the magnetic flux of odd harmonic components on the inter-rail voltage.

Furthermore, the chopper control 1iIE concept according to the present invention is as follows.

Not limited to the above-mentioned co-phase chopper circuit, if the chopper circuit has an even number of circuits, and each of the co-circuits is operated with a phase difference of /Iθ0, it is provided with a multi-phase or multi-chip circuit (9). It can also be applied to chopper-controlled electric vehicles. #! The figure shows the main circuit configuration of a chopper-controlled electric vehicle equipped with a Hirosho chopper circuit when it is in motion. In this case, if the chopper circuit 1 and the clothes, and the chopper circuit 1 and ■ are each operated with a phase difference of iro@, as shown in Figure 1X10 and Figure 1/,
By combining the main smoothing reactor M8L/ of the chopper circuit ■, the main smooth sliding axle M8LJ of the chopper circuit I, the main smooth sliding axle M8L of the chopper circuit layer, and the main smooth sliding axle M8L4I- of the chopper circuit ■, They are arranged symmetrically with respect to the center line OK, and furthermore, a shielding plate sb made of a conductor is arranged on the lower side thereof. With this configuration, all harmonic component voltages generated between the rails can be sufficiently reduced in exactly the same manner as in the ninth embodiment described above,
Induction disturbances to ground signal equipment can be prevented.

As is clear from the various embodiments described above, according to the present invention, each main smoothing reactor of a pair of chopper circuits operated with a phase difference of /10@ is positioned symmetrically with respect to the centerline of the vehicle body. By arranging a shielding plate made of a conductor on the lower part of these main smoothing reactors, it is possible to prevent odd-order harmonic components and even-order harmonic components occurring in each main smoothing reactor. It is possible to effectively eliminate or reduce the interlinkage of magnetic flux with the rails that form a loop in relation to the axle, and to sufficiently reduce all harmonic component voltages generated between the rails, thereby reducing the need for ground signals. Induction disturbances to equipment can be reliably prevented.

(9) According to the present invention, the direction of each main smoothing reactor can be perpendicular to the longitudinal direction of the conventional undersized rail, and there is no need to provide shielding plates at both ends of each reactor. It is advantageous in terms of

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state of occurrence of induction disturbance in a conventional chopper-controlled electric vehicle, Figure 3 is an explanatory diagram showing a means for shielding the magnetic flux generated by the beam axle, and Figure 3 is an explanatory diagram showing the means for shielding the magnetic flux generated by the beam axle. Fig. V is a wiring diagram showing an embodiment of the main circuit #6#l configuration that supports the chopper circuit when the fE buckwheat control electric vehicle according to the present invention is in motion; FIG. 6 is an explanatory diagram of the vehicle body showing the configuration and arrangement of the main smoothing reactor of the chopper-controlled electric vehicle according to the present invention.
l (b) is a waveform diagram showing the phase relationship between the main smoothing reactor shown in Fig. V and Fig. 5 and the flowing ill flow. Figure 1 is an explanatory diagram showing the relationship between the magnetic flux of the high am component generated by the main flat sliding axle shown in Figure 5 and the shielding plate, and Figure 2 is an illustration of the chopper control electric diagram consisting of a G-phase chopper circuit. Figure 10 shows the main circuit configuration when the car is in motion. FIG. 2 is an explanatory plan view of the vehicle body showing the #II configuration Ili of the main smoothing reactor of the chopper control electric vehicle having the main circuit configuration shown in FIG. 2, and FIG. 1 is an explanatory front view of the vehicle body shown in FIG. 7Q. R...Rail Ax...Single Axis L...Main flat sliding axle K...Railway crossing *1 + Miko X01. Relay power Ti...Input terminal TO...Output terminal sb...Shielding plate Φ...Magnetic flux
T... Overhead line P... Pantograph FL...
・Filter reactor FC...filter capacitor
M/, Mco...DC motor CH/, CH2...Chopper M8L/, M8Lco...Main smoothing reactor FWD/
, FWDJ...freewheel diode IGj

Claims (4)

[Claims] (1) In a chopper-controlled electric vehicle configured to connect an even number of chopper circuits in parallel and operate out of phase with each other,
A main smoothing reactor t constitutes a pair of chopper circuits having a phase difference of ito@. Place them at the bottom of the car body in symmetrical positions with respect to the center line of the car body, and also place shielding plates made of conductors on the lower side of these main smoothing reactors! A chopper-controlled electric car with mold. (2)! In the chopper-controlled electric vehicle according to claim 1, the pair of main flat sliding axles arranged symmetrically with respect to the center line of the vehicle body are arranged on the same axis, with the center axis of each coil being perpendicular to the center line of the vehicle body. A chopper-controlled electric car that is directed upwards. (3) Scope of Claims No. 1. IIt or the chopper-controlled electric vehicle according to item 2, in which a pair of main flat sliding acrylates arranged symmetrically with respect to the center line of the vehicle body are differentially connected to each other. (4) Special #I! The chopper-controlled electric vehicle according to item 1 or 1 of the above-mentioned scope of requests for Frill, wherein the pair of main smoothing reactors arranged symmetrically with respect to the center line of the vehicle body are harmonically connected to each other.