DE301601C - - Google Patents

Description

In the case of single armature converters, in particular direct current-direct current converters, the invention aims to be able to regulate the secondary voltage within wide limits without losses.
For this purpose, an armature with two anchor windings wound over different pole pitches is used in a multi-pole field and provision is made that individual pole pairs are weakened and switched

ίο can. So z. B. in one with eight effective poles equipped magnet system an anchor with eight-pole on the one hand and on the other hand run four- or two-pole armature winding. At least about speed increases

t5 of impermissible size in the case of the mentioned To avoid weakening and reversal of the fields, both armature halves can be connected in series in the motor circuit.

Of course, reversing poles and auxiliary windings can be used for special purposes, such as compound coils, built into the machine to keep the secondary voltage or current equal will.

In the drawing, an embodiment of the invention is shown in the view (Fig. 1), in section (Fig. 2) and in the circuit diagram (Fig. 3). These represent a direct current-direct current single armature converter with four pronounced poles and with a four- and two-pole wound armature. The four-pole armature winding d is through the commutator c with the brushes f and f ₁ and the two-pole armature winding e through the commutator b with the Brushes g and ^ ₁ connected.

While the secondary circuit SS _{1 is} connected by the brushes g and g _x on the two-pole armature side, by connecting the primary circuit j>-j> _x to the brushes f ₁ and ^ ₁ and the direct connection of the brushes f and g both are Armature windings in the motor circuit connected one behind the other in a safety circuit. The field coils I, II, III and IV are separated into two groups. The current in one coil group III-IV can be regulated by means of a controller r and reversed by a changeover switch u for the purpose of switching the magnet system into one with four (NSNS) or two (NNSS) poles. Both coil groups are connected to the primary network p-φχ. In order to obtain a smaller control resistance, however, the coil group III-IV can be connected to the brushes f and f ^ under certain circumstances. If, as Fig. 1 shows, the magnet system is connected with four poles , the electromotive forces induced in the four-pole armature winding d come into their own, while they cancel each other out in the two-pole armature winding e. The secondary voltage is zero in this case. If the field in its poles is reduced by the controller r by weakening the excitation current in coil group III-IV, the electromotive forces induced under the poles of coils I and II predominate, and the two-pole brushes g and g _{x occur} Winding e has a corresponding secondary voltage. By further weakening the excitation current of group III-IV down to zero and re-energizing up to the full value to the opposite polarity (two-pole magnet system), the electromotive forces generated by the two-pole armature winding are then fully activated and those of the four-pole armature winding are canceled out. The secondary voltage, minus the ohmic voltage drop in the four-pole armature winding and its brushes, is now equal to the primary voltage. As a result of the series connection of the two Ankei windings (safety circuit), the two-pole armature winding alone comes into force to supply the counter-electromotive force for the primary voltage applied, instead of the four-pole with four-pole connection of the poles.

Claims (1)

Patent claim: One armature converter with two armature windings and adjustable field coils, thereby characterized in that the two armature windings which are in series on the primary network can have different poles, so that one armature winding more than the other can be excited inductively if by weakening and reversing individual field pole groups the number of poles and field strength of the field magnet is changed. 1 sheet of drawings.