MXPA99007859A - Improved device for electric power supply of traction motors of urban vehicles or suburba - Google Patents

Abstract

Device for feeding electrical current of at least one motor (M1, M2, M3, M4) of series excitation, characterized in that it includes a disconnector (11, 13, 15, 12, 14, 16) comprising a mid-point (M) ) connected to the armature of said motor and to which are connected at least a first commanded static switch (11, 13, 15) further connected to a voltage source, applied to the electric motor (M1, M2, M3, M4) (which generates a traction feed current and at least a second commanded static switch (12, 14, 16), for closing a junction circuit with a load (40) for the motor (M1, M2, M3, M4) that functions as generator during a braking and switching means of polarized diodes in the reverse direction (32, 44, 35, 45, 31, 43, 34, 39), further connected to the ground, to allow respectively the passage in a first direction of the current of motor power supply (M1, M2, M3, M4) released by the first commanded static switch (11, 13, 15 ), during the conduction of this and the passage in a second direction, of the current released to the junction circuit with the load (40) by the engine that functions as a generator during the conduction of this, through said second commutated static switch (12, 14, 1

Description

IMPROVED POWER SUPPLY DEVICE FOR VEHICLE TRACTION ENGINES URBAN OR SUBURBAN.

FIELD OF THE INVENTION The present invention relates to electric power supply devices of traction motors of urban or suburban vehicles, and relates more precisely to current tripping devices.

BACKGROUND OF THE INVENTION In such devices, it is used to operate electric motors either in traction or brake, static switches such as thyristors, and the use of all these switching means, require the use of forced communication circuits or in In the case of thyristor circuits, its command is subordinated to waiting for the current in the thyristors to be lower than its hypostatic maintenance current.

REF .: 031142 In all cases, there is current discontinuity, which constitutes a not insignificant inconvenience of the known devices.

DESCRIPTION OF THE INVENTION The invention aims to create a device for feeding electric traction motors that can be switched in traction and braking, allowing traction-braking switching of the excitation motors in series, in a completely static and natural way. It then has as its object, an electrical power supply device of at least one excitation motor in series, characterized in that it includes a disconnector comprising a mid point joined to the armature of said motor and to which at least a first static switch is connected. commanded, also connected to a voltage source, applied to the electric motor that generates a traction supply current and at least a second commanded static switch, closing a junction circuit with a load, for the motor when it operates as generator during a braking and switching means of polarized diodes in the reverse direction, also connected to the ground, to allow passage in a first direction of the motor supply current, released by the first static switch commanded, during driving of this and the passage in a second direction, of the current released to the junction circuit with the load by the motorcycle r that works co or generator during the conduction of this, through said second commanded static switch. The feeding device according to the invention can, moreover, include one or more of the following characteristics, taken alone or according to all the technically possible combinations: - said first and second commanded static switch, are switches formed by bipolar transistors of isolated grid IGBT, - the common point of the switch, is connected to at least one excitation motor in series, mounted on a first arm, comprising an armature and an inductor of said motor, and associated diode switching means and at least one excitation motor in series, mounted on a second arm connected in parallel with the first arm and comprising an armature and an inductor of said motor and means of commutation of associated diodes, and the load for said motors when they function as generators, is a common load for the first and second arm, the switching means of polarized diodes in a first direction, comprise a first diode connected between the armature and the inductor associated with the motor and a second diode connected between said inductor and the ground, said first and second diodes are biased to conduct the current of al This motor, released by said first static switch commanded during its conduction, being blocked by the second commanded static switch, the switching means of diodes polarized in a second direction, comprises a third diode connected between the armature and the associated inductor and a fourth diode interposed between the inductor and the load, said third and fourth diodes are polarized to drive the braking current released by the motor that functions as a generator during the conduction of the second static switch commandedWith the first static switch commanded being blocked, the switching means of polarized diodes in a second direction comprise a third diode connected between the armature of the motor arranged in said first arm and the motor inductor arranged in said second arm and a fourth diode interposed between the inductor and the load (40), said third and fourth diodes have been polarized to drive the braking current released by the motor that operates as a generator during the conduction of the second commanded static switch, the first commanded static switch being blocked, - the disconnector has, connected with its midpoint, several first static switches commanded for application to at least said electric motor a power supply of traction and the same number of second commanded static switches, closing the connection circuit with the load, for the engine that works as a generator during braking. The invention can be better understood, with the reading of the following description, given only by way of example and referring to the drawings that are annexed in which: - Fig. 1 is an electrical diagram of a motor feeding device electric series excitation devices, of the type of bidirectional disconnector according to the invention; - Fig. 2 is an electrical diagram of the feeding device of Fig. 1 operating in tension; and - Fig. 3 is an electrical diagram of the feeding device of Fig. 1 operating in braking. The power supply device shown in FIG. 1 includes an inductance 1 connected in series with a capacitor 2 to the terminals of a direct voltage supply source UL by means of a parallel circuit 3 comprising a circuit breaker 4 to which terminals are connected in series, a fuse 5, a protection switch 6 and a resistor 7. A bipolar transistor switch with isolated grid or IGTB 8 and a diode 9 connected to the emitter-collector section is connected in series to the terminals of capacitor 2. of the IGTB switch 8. In parallel, a rheostat 10 has been connected to diode 10. Two groups of two IGTB switches 11, 12, 13, 14, 15 and 16 have also been connected to the terminals of the capacitor 2 in parallel. , the collector-emitter sections of the transistors of each group being connected in series.

In parallel, the respective diodes are connected to the emitter-collector sections of the IGBT transistors 19, 20, 21, 22, 23, 24, and the cathodes of said diodes are connected to the collectors of the associated transistors. The junction points of the emitters of the switches 19, '21, 23 with the collectors of the switches 20, 22, 24 form the middle point of the disconnector and are connected together with the first terminals of two armatures 25, 27 of a first and of a second electric motor Ml, M3. The armatures 25, 27 are each connected in series with a respective armature 26, 28 of a second and fourth electric motor M2, M4. The circuit constituted by the switches 11, 13, 15 and their associated diodes 19, 21, 23 and by the switches 12, 14, 16 and their diodes , 22, 24 associated, the switches 11, 13, 15 and 12, 14, 16 that have common terminals connected to the armatures 25, 26 and 27, 28 of the electric motors Ml to M4, form a medium point disconnector M of power of said motors. According to the required power to the disconnector, this can consist only of two or with an IGBT switch connected on each side of the midpoint M.

The armature terminal 26 of the motor M2 opposite to the armature 25 of the motor Ml is connected by means of an isolation contactor 30 to the cathode of a diode 31 and to the anode of a diode 32. Likewise, the armature terminal 28 of the motor M4 opposite to the armature 27 of the motor M3 is connected by means of an isolation contactor 33 to the cathode of a diode 34 and to the anode of a diode 35. The cathode of the diode 32 is connected on the one hand to the inductors 37, 38 of the Ml, M2 motors connected in series and, on the other hand, to the cathode of a diode 39 connected by its anode to a resistor 40 for limiting the fault current in braking. The cathode of the diode 35 is connected on the one hand to the inductors 41, 42 of the motors M3, M4 connected in series and, on the other hand, to the cathode of a diode 43 connected by its anode to the current limiting resistor 40. defect in braking. The terminal of the inductor 38 of the motor M2 opposite the inductor 37 of the motor M1 is connected to the anode of a diode 44 whose cathode is connected to the ground as well as to the anode of the diode 34 whose cathode is connected to the isolation contactor 33 of the armatures. 27 and 28 of the M3 and M4 engines.

The terminal of the inductor 42 of the motor M4 opposite the inductor 44 of the motor M3 is connected to the anode of a diode 45 whose cathode is connected to the ground, as well as to the anode of the diode 31 connected by its cathode to the isolation contactor 30 of the induced 25 and 26 of the Ml and M2 engines. It can be seen then, that the diodes 32 and 44 joining the armatures 25, 26 of the motors Ml, M2 with their inductors 37, 38 and the diodes 35 and 45 joining the armatures 27, 28 of the M3, M4 motors with their inductors 41, 42, which are polarized in a first direction, ensure operation of the motors in tension when the IGBT switches 11, 13, 15 are conductors and the IGBT switches 12, 14, 16 are blocked. On the other hand, the diodes 31 and 43 connecting the armatures 25 and 26 of the motors Ml, M2 to the inductors 41, 42 of the motors M3, M4 and the diodes 34 and 39 joining the armatures 27, 28 of the motors M3, M4 with the inductors 37, 38 of the motors Ml, M2 and with the limiting resistor 40, which are polarized in a direction opposite to the polarization direction of the diodes 32, 44, 35, 45, ensure the operation of the motors in braking when the IGBT switches 12, 14, 16 are conductors and the IGBT switches 11, 13, 15 are blocked.

The operation of the bidirectional disconnector described as reference of figure 1, will be described referring to figures 2 and 3 in which only the components that intervene respectively in the traction and braking operation are represented. The IGBT switches 11, 13, 15 are commanded in traction. The cyclic relationship of the conduction of these switches varies between 0 and 1. The IGBT switches 12, 14, 16 are commanded in braking. The cyclic relationship of the conduction of these switches varies between 0 and 1. The Ml, M2, M3, M4 engines are connected in series-parallel and it is assumed that they equip the bogies of two engines of an urban or suburban vehicle machine. In the case of the use of bogies of a motor, the scheme would include two motors switched in parallel. It will also be noted that the invention also applies to the feeding of a single motor. Depending on the IGBT switches 11, 13, 15 or 12, 14, 16 commanded, the motors ^ are naturally connected in traction or braking thanks to the diodes 32, 44, 35, 45 and 31, 34, 43, 39 respectively. When the disconnector works in traction, its scheme is that of figure 2.

The IGBT switches 11, 13 and 15, perform the function of conductors while the IGBT switches 12, 14, 16 are blocked as shown in Figure 2 in which the switches 12, 14, 16 are represented with dashed lines. The diodes 20, 22, 24 connected to the terminals of the emitter-collector sections of the switches 12, 14, 16 serve as free-wheeling diodes. The diodes 19, 21, 23 associated with the switches 11, 13, 15 conductors do not intervene and therefore are not represented with dotting.

The disconnector that has thus been configured, feeds the traction motors Ml to M4. The armatures 25, 26 of the motors Ml, M2, are naturally connected in series with their inductors 37, 38 by means of diodes 32 and 44. The. induced 27, 28 of the motors M3, M4 are naturally connected in series with their inductors 41, 42 by means of diodes 35 and 45. When the disconnector is operated in braking, its scheme is that of figure 3. The IGBT switches 12 , 14, 16 become conductors and the diodes 19, 21, 23 associated with the blocked switches 11, 13, 15, represented with dashed lines fulfill the function of freewheeling diodes. The diodes 20, 22, 24 associated with the switches 12, 14, 16 are inoperative and are therefore represented with dotting. The disconnector thus configured supplies the traction motors Ml to M4 to make them function as generators. The armatures 25, 26 of the Ml, M2 motors are naturally connected in series with the inductors 41, 42 of the M3, M4 motors by means of the diodes 31, 43 and with the braking defect current limiting resistor 40 that makes the load for motors that function as a generator. The armatures 27, 28 of the motors M3, M4, are naturally connected in series with the inductors 37, 38 of the motors Ml, M2 by means of the diodes 34, 39 and with the brake current limiting resistor 40 in braking . The crossing of the inductors with respect to the armatures of the motors Ml, M2 and M3, M4 is necessary to ensure the stability of braking operation of the arms of the motors connected in parallel. The isolating contactors 30, 33 are always closed regardless of the mode of operation in traction or braking, as well as during transitions between these two modes. The role of these contactors is to control the brake fault current in association with the braking resistor current limiting resistor 40. These contactors also isolate the inductors of the Ml to M4 motors, in case the machine equipped with this system and its trailer are out of service. The configuration that has just been described allows a switching from the traction mode to the braking mode of the series excitation motors which is totally static and natural. Simply switch the power cut off device either in traction or in braking. On the other hand, the disconnector according to the invention offers a certain number of advantages. In the field of the renewal of the traction equipment, exploits optimally, the characteristics of the excitation motors in series. From an industrial point of view, the main advantage of a disconnector according to the invention, is to allow the identical reuse of power assemblies of standard MLI corrugators, to perform the function of current disconnector. To this effect, the three output phases are short-circuited and the three switches 11, 13, 15 are driven in tension and the three switches 12, 14, 16 are braked and associated with the traction and braking switches, the device of traction-braking of diodes. Finally, the bidirectional current switching power supply device according to the invention includes a single resistor 40 for limiting the braking fault current for the two groups of electric motors Ml, M2 and M3, M4. This resistance is naturally switched in the braking circuit by the diodes 39 and 43.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the manufacture of the objects to which it refers.

Having described the invention as above, the content of the following is claimed as property.

Claims (7)

1. Electrical power supply device of at least one series excitation motor, characterized in that it includes a disconnector comprising a mid point joined to the armature of said motor and to which are connected at least a first commanded static switch connected in addition to a source of voltage, applied to the electric motor that generates a traction supply current and at least to a second commanded static switch, closing a junction circuit with a load for the motor that works as a generator during braking and switching means of diodes polarized in the opposite direction, also connected to the ground, to allow respectively the passage in a first direction of the supply current of the motor released by the first commanded static switch, during the conduction of this and the passage in a second direction, of the current released to the junction circuit with the load by the motor that works as a hard generator the conduction of this, through said second commanded static switch.

2. Feeding device according to claim 1, characterized in that said first and second commanded static switches are switches formed by bipolar transistors of isolated IGBT grid.

3. Feeding device according to any of claims 1 and 2, interchangeably, characterized in that the common point of the disconnector is connected to at least one series excitation motor mounted on a first arm, comprising an armature and an inductor of said motor and associated diode switching means and at least one series excitation motor mounted on a second arm connected in parallel with the first arm and comprising an armature and an inductor of said motor and associated diode switching means, and the load for these motors when they function as generators, it is a common load for the first and second arm.

4. Feeding device according to any of claims 1 to 3, interchangeably, characterized in that the switching means of diodes polarized in a first direction, comprise a first diode connected between the armature and the inductor associated with the motor and a second diode connected between said inductor and ground, said first and second polarized diodes being said to drive the supply current of said motor, released by said first static switch commanded during its conduction, the second controlled static switch being blocked.

5. Feeding device according to claim 4, characterized in that the switching means of diodes polarized in a second direction comprise a third diode connected between the armature and the associated inductor and a fourth diode interposed between the inductor and the load, said third being and fourth polarized diodes for driving the braking current released by the motor that operates as a generator during driving of the second commanded static switch, the first commanded static switch being blocked.

6. Feeding device according to any of claims 3 and 4, interchangeably, characterized in that the switching means of polarized diodes in a second direction comprise a third diode connected between the armature of the motor arranged in said first arm and the motor inductor arranged in said second arm and a fourth diode interposed between the inductor and the load, said third and fourth diodes are polarized to drive the braking current released by the motor that functions as a generator during the driving of the second commanded static switch, the first being blocked static switch commanded.

7. Feeding device according to any of claims 1 to 6, interchangeably, characterized in that the disconnector includes, connected to its mid-point, several first static switches commanded to apply at least to said electric motor of the supply current in tension and the same amount of seconds commanded static switches closing the junction circuit with the load for the motor that works as a generator during braking. SUMMARY OF THE INVENTION Device for feeding electrical current of at least one motor (Ml, M2, M3, M4) of series excitation, characterized in that it includes a disconnector (11, 13, 15, 12, 14, 16) comprising a mid-point (M) ) connected to the armature of said motor and to which are connected at least a first commanded static switch (11, 13, 15) further connected to a voltage source, applied to the electric motor (Ml, M2, M3, M4) that generates a traction feed current and at least a second commanded static switch (12, 14, 16), for closing a junction circuit with a load (40) for the motor (Ml, M2, M3, M4) that functions as generator during a braking and switching means of polarized diodes in the reverse direction (32, 44, 35, 45, 31, 43, 34, 39), further connected to the ground, to allow respectively the passage in a first direction of the current power supply (Ml, M2, M3, M4) released by the first commanded static switch (11, 13, 15 ), during the conduction of this and the passage in a second direction, of the current released to the junction circuit with the load (40) by the engine that functions as a generator during the conduction of this, through said second commutated static switch (12, 14, 16).