SU126176A1 - Electric generator of unipolar pulses - Google Patents

Description

 In auth. St. No. 104347 describes a unipolar generator designed to receive DC pulses, mainly for powering electric-spark installations for treating conductive materials. In this generator, which, as usual, on the rotor, conductors connected to contact rings located at the ends of the rotor, the magnetic excitation system of the machine is composed of a series of like poles located around the stator circumference.

The proposed generator of unipolar pulses is a further improvement of the generator described in ed. St. No. 104347 and provides a change in the frequency and alternation of the generated pulses.

This is achieved by dividing the rotor winding of the generator into two parts, in which ed is induced. with., shifted in time, and its output on two systems of slip rings, which can be interconnected either in series or in parallel. When the rings are arranged in series along the ends of the rotor, the conductors connecting the contact brushes placed on these rings are placed in axial grooves evenly spaced around the stator circumference, thus weakening the reaction of the core.

FIG. 1 shows the proposed generator in longitudinal section; in fig. 2 the same, a section along the line L-L in FIG. one; in fig. 3 shows the curve for changing the unipolar voltage taken from the generator terminals.

In the frame / generator, there are axial grooves 2 in which Excitation winding 3 is laid, creating a series of magnetic poles located around the stator circumference.

No. 126176-2 -

The insulated conductors 4, which form the rotor winding, are placed in the grooves 5 and attached at their ends to the contact rings 6. On the latter, contact brushes are applied, from which unipolar voltage is removed. The series connection of the conductors 4 is carried out by the corresponding connection of the contact brushes with the help of connecting conductors 7, placed in the slots 8 that are evenly spaced around the stator circumference, thus weakening the reaction of the core. To reduce bark losses, the outer part of the bark is exfoliated and consists of sheets I mounted on the shaft. The shaft diameter must be large enough to allow the generator to flow through the shaft.

Since the entire working flow of the machine passes through the shaft and the shields, it is desirable to significantly reduce the bearing currents or prevent them from occurring by placing the bearings in capsules or additional shields 10 of non-magnetic material.

The unipolar voltage for both phases, taken from the contact brushes, is shown in FIG. 3. Curve a is the voltage of the first phase of the winding of the core taken from the terminals, and curve b is the voltage of the second phase taken from the terminals of Mon and Pk. In each phase there are four conductors () of rods connected to two pairs of rings, two rods to each ring in parallel. The value of e. d. with an appropriate choice of tooth sizes, it can be obtained sufficiently small, so that the voltage pulses produced are almost unipolar.

Subject invention

Claims (3)

1. Electric generator of unipolar impulses according to ed. St. No. 104347, containing conductors on the rotor, connected to slip rings located at the ends of the rotor, and a magnetic field excitation system of the same name, characterized in that, in order to change the frequency and alternate the generated pulses, the rotor winding is divided into two parts in which they are induced. D. s., shifted in time, and displayed on two systems of slip rings, which can be interconnected either in series or in parallel. 2. The generator according to claim 1, characterized in that, in order to reduce the core reaction, the conductors connecting the contact brushes are laid in axial grooves evenly spaced around the circumference of the stator. 3. Generator on PP. 1 and 2, characterized in that, in order to attenuate the current flowing through the bearings, the bearing shields are made of a non-magnetic material. Ni Phage I. Fig 2