SU760337A1 - Three-phase static ferromagnetic frequency doubler - Google Patents

Description

The invention relates to electrical engineering, to static ferromagnetic devices designed to convert a three-phase voltage5 of one frequency into a three-phase current of double frequency.

There are known static frequency multipliers, assembled from six single-phase transformers on flat cores. The multiplier is provided with bias windings with direct current, and the primary windings are connected in two unequal zigzags £ ΐ].

A disadvantage of the known device is, 5 large dimensions and asymmetry of the output voltages in phases.

Three-phase static ferromagnetic doublers of frequency are also known. 20

s containing a three-phase monoplane, the remaining magnetic system with six

with rods joined together by two yokes, the cross section of which is 2 times larger than the cross section of one st. On each rod are the coils of the output winding and the bias winding DC. Adjacent pairs of rods are covered by the primary winding, and the windings of the middle phase are 30

2

Threat perform with the number of turns of 5-8% less than the extreme phases of £ 2] ..

The disadvantage of the frequency doubler is a violation of the symmetry of the output voltages and primary currents when the magnitude of the load changes due to the asymmetry of the magnetic circuit and the different number of turns in the phases of the primary winding, as well as a large weight of yokes that cannot be effectively used as output harmonic energy generators, since The magnetic induction of the magnetic bias in the yokes is much less than in the rods.

The purpose of the invention is to reduce the weight of the device and balancing the output voltage.

This goal is achieved by the fact that in a three-phase static ferromagnetic frequency doubler containing a six-core magnetic recorder, on each rod of which there are coils of the secondary winding and bias winding, and on each pair of adjacent rods there are coils of the primary winding, the magnetic circuit is spatial with hexagonal ynema, and rods are arranged in pairs within

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straight sections of the yoke, whose cross-sectional area refers to the cross-sectional area of the rods as 2: / 7, while the primary winding coils are made with the same number of turns.

FIG. 1 shows the connection diagram of the windings; in fig. 2 - the design of the magnetic circuit.

Three-phase static ferromagnetic frequency doubler contains rods 1-6 and Two six-sided yokes 7, 8. Adjacent rods 1 and 2, 3 and 4, 5 and 6 are covered by the same primary coils 9, 10 and 11, respectively, and are fixed between the ends within rectangular sections yoke The coils 12-17 of the bias winding are wound on the corresponding ’rods, connected in series and connected to a DC source. The coils 18–23 of the output winding are also wound on the corresponding rods and connected in phase-successively opposite way. The phases of the output winding can be connected both in a star and in a triangle.

The principle of operation of this device is based on the phenomenon of generation of higher harmonics in a magnetic core saturated with alternating and constant fields, and the allocation of double frequency due to the proposed design of the magnetic core and connection of the output winding.

The magnetic circuit of the frequency doubler of the proposed design is symmetrical, due to which at one. the corresponding windings achieve the symmetry of the output voltages and primary currents. Since

„The main harmonic flux in the yokes of three-phase spatial

magnetic conductors of the specified type in Ϋ ?. smaller than the magnetic flux in the rods, then the same inductions in the yoke and rod yoke section must in this case be a 2 / - / January ³ times pain PWM s.echeniya one rod, i.e. in / 3 ¹ less than the cross section of the yoke analog. Due to the smaller cross section (despite some lengthening of the average length of magnetic field lines in yokes), the weight of the yoke decreases.

Claims (1)

Claim A three-phase static ferromagnetic frequency doubler containing a six-core magnetic conductor, on each rod of which secondary windings and biasing magnetizing coils are located, and on each pair of adjacent rods primary coils are located, in order to reduce the weight of the device and to balance the output voltage , the six-core magnetic circuit is made spatial with twisted hexagonal yokes, while the rods are arranged in pairs within the straight sections of the yokes, the area is eniya which relates to a sectional area of both rods 2: / 7, wherein the primary winding coil made with the same number of turns.