DE1588380C - Arrangement for countercurrent braking of a direct current series motor fed from a battery via a pulse control device - Google Patents

Description

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The invention relates to an arrangement. In the drawing, an embodiment is shown with a pulse-controlled direct current series motor with two of its exciter motor according to the invention, for countercurrent braking of a battery with two reversing contactors to reverse the polarity of the exciters.
winding reversing contactors and with a 5 The series motor with. the motor armature first, the armature and the excitation winding as well as AB and the excitation winding EF is fed from a second, only the armature winding bridging direct current source G1. To break down the diode, both of which are direct current in the direction of the battery current into individual pulses, a thyristor Th is switched on in the current locks, which is connected to the

There is an arrangement for a direct current xo amplifier V is controlled and which also has a series motor known (French patent - extinguishing device not shown,
writing 1,414,263), wherein an equipped with a total The excitation winding EF is connected to the motor controlled semiconductor element, between anchor AB one hand and the thyristor Th the other a battery as a DC power source and arranged in taxable electric motor to turn over the two contactors 1 and 2 Control device 15 binding. These two contactor contacts are so getung the direct current according to the middle switches that the common connection of the contactor motor power is broken down into individual pulses. In the case of a contact 1 with terminal E of the excitation winding, an uncontrolled valve, a so-called contact 2, is required to maintain the current flow in the motor during the pulse pauses connected to one terminal of the diode D 1, while the common connection of the contactor is required with the terminal F of the excitation winding called freewheeling diode, the motor so parallel to and one terminal of the diode D 2 is connected. The switch that it blocks alternating contacts of the two contactors in the direction of the direct current, on the other hand, for the valve in the opposite direction, that the direction flowing through in the figure on the right, through the inductance contacts via the thyristor Th with the equal Excitation winding generated when switching off 25 current source G1 are connected, while in the current is permeable. Furthermore, a second drawing on the left is provided changeover contacts with the uncontrolled valve, which are connected to the armature of the terminal B of the motor armature AB . The motor is connected in parallel and, like the diodes D 1 and D 2, are connected in such a way that the freewheeling diode blocks the direct current supplied by the direct current source Gl in the direction of the feeding DC, while blocking the current in the event of a current interruption.

tion generated during the pulse pauses in the armature The supplied by the direct current source G 1

th current is permeable. These armature currents flow. Direct current always flows through the motor armature AB

not via the field winding, but can move in the same direction, on the other hand the field winding

directly via this second valve, the so-called EF depending on the position of the contactor contacts 1.2 in

Armature brake diode, balance. The polarity reversal 35 opposite directions,

for the purpose of reversing the direction of rotation, a control element (not shown) is used in this way

known engine control made in the anchor. the reversing contactors briefly one after the other in the

In addition, it is known that such a pulsed sequence is actuated that the contactor contact is always closed.

current series motors by reversing the polarity of the first is operated, which was previously based on the motor

energizing winding while maintaining the side of the energizing winding facing away from the 4 ° armature AB

Motor drive circuit used by counter- EF was switched on.

Braking or reversing current braking If you go from the drawn out, drawn

(German interpretation document 1 240 982). For this purpose, a position of the contactor contacts 1 and 2 is off, so results

Direction of travel reverser with always four switching contacts:

required, of which two are opened and 45 The current supplied by the direct current source Gl

two are closed and when actuated first the flows through the motor armature in direction AB and

closed contacts open and then the forward through the field winding in the direction of EF; over

open contacts are closed. The circuit is closed with the thyristor Th. the

the entire current is suddenly interrupted, ie diodes D 1 and D 2 block. During the impulse

the battery current and that through the inductance of the 50 pause of the thyristor Th flows through the in the

Excitation winding generated electricity, so that energy stored in the um- excitation winding generated electricity

Switching of the contactors with strong sparks and light via the diode D 2 and the motor armature AB ,

arcing occurs which makes the contactor contacts stronger

claimed. first the contactor contact 2 is in the

The object of the invention is to bring the position shown in dashed lines at 55. This pulse-controlled direct current series connection is practically powerless, since the motor interrupts the switching sparks that occur when the motor is switched to counter-braking by the contactor contact 2, i.e. an induction-free current avoidance, so that the switchover is practically a power circuit , during which takes place in the motor armature AB and in the los. 60 excitation winding EF inductively generated electricity as well

The invention can be used with an arrangement of the one-way and the pulse pause via the diode 2.

The above-mentioned way of seeing that each of them can flow. Then the contactor contact 1

Diodes are always brought directly into the position shown in dashed lines with one connection each. This

the excitation winding is connected and that a circuit is completely powerless because of the

Control element is provided that the reversing contactors 65 so far via the contactor contact 1 and the diode D 1

operated one after the other in such a sequence, armature current flowing now through the contactor contact

that in the meantime between the actuations clock 2 and the diode D 2 can flow. The one from the

both diodes are parallel to the armature winding. However, the current supplied by the direct current source G1 flows

now when the thyristor Th is driven by the excitation winding in the direction FE, ie the direction of the excitation field is reversed, the motor is driven in the opposite direction of rotation, and the two diodes Dl, D 2 have exchanged their functions. The armature circuit is not interrupted at all when switching over the two contactor contacts 1, 2.

When the pulsation of the thyristor Th starts again, the motor armature AB generates an electromotive force which is positive at the connection point B and a current within the armature circuit via the diode D 2, which is parallel to the armature after the new switch position of the contactor contacts 1,2 drives. As a result, the motor is braked to a standstill and can then be started up again in the opposite direction of rotation.

Claims (1)

Claim: Arrangement for countercurrent braking of a DC series motor fed from a battery via a pulse control device with two reversing contactors reversing its field winding and with a first diode, the armature winding and the field winding as well as a second diode bridging only the armature winding, both of which block in the direction of the battery current, characterized in that each of the diodes (D 1, D 2) is always directly connected to one terminal of the field winding (EF) and that a control element is provided which operates the reversing contactors (1, 2) one after the other in such a sequence that in the meantime between the Actuations both diodes (Dl, D 2) are parallel to the armature winding. 1 sheet of drawings