SU50571A1 - Device for parallel operation of direct current electric machines - Google Patents

Description

The invention relates to devices for parallel operation of electric machines of direct current; devices similar in purpose, in which an auxiliary dynamo driven by an equalizing current was used to affect the excitation circuit of one of the machines operating in parallel, are already known. In the proposed device according to the invention, auxiliary generators are connected between equal points of a circuit in normal operation, made up of successively connected excitation windings of adjustable machines and their causative agents.

The proposed device is shown in the drawing, where FIG. 1 shows a diagram for two machines operating in parallel, and FIG. 2-for a few cars.

In the device of FIG. 1 two electric machines 1 run in parallel. Their excitation windings 2 are powered by pathogens 4. The pathogens 4 and the excitation windings of 2 machines / are connected in series.

To single-potential points, this series circuit is an auxiliary booster 7, the excitation winding of which is included in the equalization wire 5 and is powered by the difference in voltage drops in the successive windings 3 (compensation and winding of additional poles) of machines 1. The generator 7 rotates constant speed motor, as well as pathogens 4,

The operation of the device is as follows. At the same machine loads / voltage drop in their successive windings 3 is the same, and the generator excitation current 7, and, therefore, e. d. are zero.

With unequal loads of both machines 1, the voltage drops in successive windings 3 are different, and a current flows through the excitation winding 6 of the generator 7; the generator is energized. As a result, the voltage applied to the excitation winding 2 of one machine / will increase by the amount of emf. generator 7, and on the other winding 2

the voltage by the same amount decreases. This will lead to the redistribution of the excitation currents of the machines /, and, consequently, of their loads.

The proposed scheme is applicable to both engines and generators.

To reduce the number of machines, the pathogens in the circuit of FIG. 1 can be combined into a single machine with a midpoint brought to a sliding contact (point of a DC generator for a three-wire system).

To equalize the load of several machines, the number of generators 7 will increase accordingly.

FIG. 2 is a diagram for five machines. The operation of the circuit is the same as in FIG. one; The number of generators 7 is one less than the number of machines L

, At the direction of the author, mosh; generator 7 for two engines of 5000 liters each. with. is about 1 kW, i.e. about 0.025% of the mosh. one engine power.

The proposed device can be used for blooming with the rotation of the rolls from individual motors, to equalize the loads of the DC generators during parallel operation (for example, in

Leonard drives with several generators) and for a multi-motor drive of relatively high power.

The subject matter of the invention.

Claims (2)

1. A device for parallel operation of electric machines of direct current, containing auxiliary generators included in the masking excitation circuit, in which the excitation windings are included in the equalization wires of the adjustable machines and which serve to automatically change the excitation of these machines in accordance with the equalization currents characterized by that the generators 7 are connected between having equal potentials during normal operation of the machines by the points of the circuit composed of successively connected windings Nor 2 adjustable cars / and their causative agents 4. 2. The form of the device according to claim 1 of the application for two parallel machines, characterized in that, in order to reduce the number of pathogens, a generator and a generator of the generator for three-wire DC networks are used to power the excitation circuit. to the author's testimony of F. A. Gor iEOva No. 50571 FIG. 2 FIG. one o.4 / adyo 7-AU Q