DE1513616A1 - Device for the elimination of any slipping of the wheels or the runaway of the drive motors of the wheel axles of vehicles electrically driven by motors with external excitation - Google Patents

Description

ETABLISSEMENTS BRISSOFiüAU ET LOTZ, 8 rue Bellini,

PARIS (16 ·), France

"Device for eliminating any slipping of the wheels or the runaway of the drive motors the Radachaen of electrically driven by motors with external excitation "

The invention relates to a device for eliminating the sliding of the driven wheels or the runaway of the drive motors of the wheel shafts of vehicles with electric drive, namely vehicles in which electric motors with external excitation are used. More particularly suitable for use in electrical or dieselektrisohen locomotives for the railway operating device for this purpose ·

Under "sliding" every impermissible is, for example, ale

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Consequence of a bad condition of the rail line occurring slipping or sliding of the driven axles of the vehicle or the wheels Understood.

The modern diesel-electric or electrically operated locomotives are equipped with devices to prevent such runaway or sliding. These devices include, on the one hand, the sole purpose of making engine runaway recognizable, and, on the other hand, the devices used to protect against the possibility of runaway. The basic principle on which their effect is based, however, is always the same.It consists in the fact that either the currents or the voltages or the rotational speeds of the traction motors are compared with each other.This means that these devices only allow going through or sliding or to make a speed difference S & Sääaa & ^T äem one and another of the majority of the branches of driving engines recognizable. To the

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Two measures are taken to prevent sliding or runaway. First of all done a correction in that the torque of the through-going motor Bchroff is reduced by, for example, be Armature is shunted by an appropriate resistor

The controller is then reset by one or two switch positions so that it is reached again of the wheels on the rails, the drive power is somewhat less than that at which the sliding began.

In certain cases only protection against the engine running away is sought, the main effect of the device being the prevention of the Runaway exists, while the task of improving the grip of the wheels on the rails is viewed as secondary will · The 'protection against going through affects this on the totality of the driven axles, i.e. also on those whose wheels do not slide. From this it follows there is an adverse reduction in the tightening force, which is a significant part of the benefits that would otherwise arise at the beginning of a start-up by such a locomotive

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drawn train is lost. Since the revving of the engines in the cone of cases through control measures done by the driver of the locomotive, this type of protection provides, although it is expedient in the event

is in which the runaway of the wheels / as a result of the poor condition of the rail track into a slide has transferred, one in the event of individual wheels slipping, for example when driving on switches is initiated, is too harsh a measure.

The invention overcomes these disadvantages.

The object of the invention is a device for making recognizable and for eliminating the sliding of the wheels,

electrical, in particular, of the type described at the beginning or diesel-electric powered locomotives, which is basically characterized in that each pair of traction engines of the vehicle are assigned two comparators, both of which are connected to the entry devices which deliver pulses proportional to the currents flowing in these motors, with an output of the one! Comparator with the entry side of a difference generator is connected, which is connected to the device on the outlet side

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for controlling overexcitation of the motors connected. As a result of this arrangement, when one of the motors is on as a result of the sliding of the wheels passes through the rails, an impulse is given on the output side of the comparator, through which the devices for bringing about the overexcitation of the continuous motor are switched on.

When the wheels slide on the rails, the current of the through-going motor and that of the motor decrease considerably required power is practically zero. The speed of the motor, however, increases because of the relative Perseverance, which is a characteristic of such traction engines, only slowly increases · Um the number of revolutions of the engine on the Yfert, which it had before going through, it is therefore sufficient that the excitation current flow is increased by a few percent for a short period of time. This results in sioh a slight braking and the sliding of the wheels on the rails is automatically stopped as soon as the state of the rails that allows · This overexcitation pulse is caused by the device according to the invention.

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The details and further features as well as gate parts of the invention emerge from the following description of exemplary embodiments of the same with reference to the figures.

Fig. 1 is a circuit diagram of a first embodiment and

FIG. 2 is a circuit diagram of a second embodiment of FIG new device for correcting the sliding or the runaway of the pulling motors

The device shown in Fig. 1 has two devices

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lines 1 and 1 for sampling the current, each of which supplies ^a voltage U ^ a or U "b proportional to the currents l ^ a and I" flowing in the circuits of the train motors la and M

The voltages UjA and U "b are simultaneously the input

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Guides of two comparators 2 and 2 supplied, which are connected on the output side to two differential images 3 ^& 3. The exit sides of these difference images are,

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in turn connected to the inlets 4 and 4 of two control comparators 5 ^a and 5, whose terminals 6 ^a and 6 also have a reference voltage U ^ e and their terminals 7 ^a and.

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a b one that flows in the excitation windings 8, 8 of the motors Proportional voltage is fed to the currents

a b The output side of the comparators 5 and k 5 to their

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Terminals 9 or 9 appearing impulses Amplifiers 10 and 10 supplied, of which that of

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Outgoing pulses are fed to them to rectifiers 11 and 11, which are supplied with current from an alternating current source S via conductor 12.

a b Each of the rectifiers 11 and 11 controlled in this way

a b feeds one of the excitation windings 8 and 8 of the motors H ^ and M with direct current · The current strength in the excitation windings is determined by the control electrodes of the thyristors or! Thyratrons of the rectifier in the usual way · The control pulses are supplied ^{by the amplifiers 10 a} and 10 ^b.

The in the Erregeretromkreieen of the motors M ^ and M flies send currents are measured by two scanning devices 13 and 13, the output sides of ^{which are connected via conductors 14 * and 14 to the input sides 7 a} and 7 of the comparators.

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The electronic equipment used for the described arrangement, namely the comparators, differential images, amplifiers and rectifiers, are of well known type and are therefore not described in detail.

The operation of the device described above is as follows:

In the normal state, some of the components of a stand, For example, a locomotive, motors generate currents of approximately the same strength, so that the compa-

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Rators 2 and 2 do not supply any outgoing voltage because

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those supplied by the current measuring devices 1 and 1 Currents cancel each other out.

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For this reason, no pulse is fed to the difference images 3 and 3 either.

The ürre & er currents that flow in the excitation windings 8 and 8 are kept constant by the control lines, in each of which there are a current sensing device 13 ^a or 13, a control ^{comparator 5 a} or 5 and an amplifier 11 ^a or 11 ^b .

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Terminal 6 of each of the Kpmparatoren is supplied with the previously specified -ürregerstrom reference voltage Uje if

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those appearing at terminals 7 and 7, respectively Pulses do not cancel the reference voltage U-j-e, deliver

from ^en

the comparators 5 or 5 a / Impulsatflckadtflfflt, through which the conductive state of the thyratrons or thyristors

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the rectifier 11 or 11 is changed.

As a result, the excitation currents are corrected until the state is reached again in which the any impulses sex appearing at terminals 7a and 7b cancel the reference voltage.

If one of the motors now runs away, that is to say slips, the current strength M ^a in this motor increases considerably, while its speed only increases by a small value because of the steady-state characteristics of such motors. In order to reduce the speed of rotation of this motor back to that which was present before it ran, the current flow in this motor is reduced by a few pro

a b cents increased by applying the compa-

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Rators 5 and 5 is acted on. Since the current in the runaway motor M ^a rises very quickly and becomes larger

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ORIGINAL INSPECTEO

If the current is 5, there is a positive voltage ^{at the output terminal of the comparator 2 a.} The resulting pulse is fed to the entry side of the difference former 3 ^a and from this a pulse to the entry terminal 4- ^{a of} the comparator 5 ^a. This therefore receives a positive voltage which is added to the reference voltage U ^ e. Due to the error voltage occurring at the output terminal 9 for this reason, an immediate increase in the excitation current of the motor M ^a _t jHöt is a slight one

through this,

This motor is braked and / as soon as the condition of the rails allows this, the wheels automatically re-engage on them. As soon as this regression has taken place, the ^{current absorbed by the motor M a} drops to its output value equal to the value of the current in the motor M, the error voltage is eliminated and the excitation current in the motor winding 8 assumes its original value again.

The embodiment of the new device shown in FIG. 2 relates to the case in which the motors NT and M have excitation windings 8 ^a and 8 fed by an excitation generator G.

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In this case, each winding is connected in series with an open contact 16 ^a or 16 of a relay 17 ^a or 17 ^{shunted resistor 15 a} or 15. The coils of these relays Bind are coupled to the output sides of power amplifiers 18 and 18, respectively.

If in this case, a motor such as the motor M *, durohgeht, about 18 results in the outgoing side of the power amplifier ^a a pulse which excites the relay 17 ^a. This causes an instantaneous increase in the excitation current in the winding 8 ^a , since the resistor 15 ^{a is} in the lift base as a result of the closing of the contact 16 a. The excitation current in the winding 8 ^a resumes its original value as soon as the wheels of the driven axle in question access again, whereupon the currents Ij ^ a and I b are _M gleioh each other again.

Of course, the invention is not limited to those described in detail above and those in the figures illustrated embodiments, which are only available as Examples are to be considered, with respect to which changes in the most varied of directions are possible without the scope of the invention to leave.

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Claims (3)

Patent claims: . Device for detecting and eliminating the sliding of the wheels of a vehicle, preferably a rail vehicle, electrically driven by motors with external excitation, characterized in that two comparators (2a, 2b) are assigned to each of the traction motors (Ma, Mb) of the vehicle, both of which Inlets are connected to scanning devices (1a, 1b) which supply pulses from the proportional values flowing in the motors, an output of one of the comparators being connected to the input side of an i ^ ifferenzbiläers (j5a, 3b) , the output side of which is connected to devices to control an overexcitation of the motors is connected, so that as soon as one of the motors passes as a result of sliding of the strife driven by it, an impulse is given on the output side of the associated comparator, which the devices for controlling the overexcitation of the continuous ... o tors takes effect. 2. Apparatus according to claim 1, characterized in that whose excitation windings (8a, 8b) are fed by a current source with controlled rectifiers gKXjSKXXfc (11a, 11b), which are connected to the excitation current of the motors corresponding reference pulse is supplied, the pre 909881/0033 - 13 - BATH directions for controlling overexcitation consist of an additional feed (4a, 4b) of the control comparator, which is connected to the outgoing side of a difference generator (3a, 3b), so that one after this The pulse given on the entry side is added to the reference pulse and thereby an immediate increase in the excitation current caused 3. Device according to claim 1, characterized in that, if the excitation windings (8a ) 8b) of the motors are fed by an excitation generator (Gr), the devices for overexcitation from V / iderstands (15a, 15a, 15b), which are shunted by the control relay (17a, 17b) through the open contact (16a, 16b) as soon as a pulse appears on the output side of the differential generator associated with the continuous motor, 4. Device according to claim 1 and / or 3, characterized in that that the relays (17a, 17b) are connected to the differential images via power amplifiers (18a, 18b) are. 909881/0033 4 » Blank page