SU571861A1 - Static ferromagnetic frequency multiplier - Google Patents

Description

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The invention relates to electrical engineering and can be used in various sectors of the national economy for powering, for example, power tools of increased frequency.

A frequency multiplier is known based on the use of transformers ij, which are rich in an input voltage of the magnetic cores of transformers.

The magnetic flux of transformers saturated with input voltage contains higher harmonic components.

Due to the fact that the windings are turned on, the required frequency is selected. Frequency multiplication is carried out by self-magnetization of the cores with an intermediate frequency current and with a constant-flux bias.

However, such a frequency multiplier is quite low. Efficiency and high specific consumption of active materials.

 Known static ferromagnetic frequency multiplier. 2, which is a prototype of this device, containing three-phase transformers with input and output windings located on their rods, as well as co-windings of parallel magnetism.

connected to each other through a capacitor in parallel, also works on the principle of using the input voltage of the transformer cores to be self-magnetized and direct-current magnetized.

The difference with this multiplier is that it self-pushes

current, output frequency and zero-sequence current (for example, for a quadrupler - current of the fourth and twelfth harmonics) and has no capacitors in the output circuit, in addition, the consumption of active materials in Hejv is still quite high, and efficiency is low. Self-excitation and sticking of electric motors takes place at start-up.

The proposed device is distinguished by the fact that on the transformer cores one of the phases has an auxiliary winding with an average; a point mounted by a chain consisting of two oppositely connected diodes, with an additional capacitor and a winding cai -io sub-magnetized over all

| Three phases in an open triangle.

This allows an increase in efficiency. devices, increase reliability and reduce the consumption of active materials.

The invention is illustrated in the drawing.

The static ferromagnetic frequency attenuator contains the input winding Wi, the output winding Wj. , auxiliary winding Wj, self-magnetizing winding Wj. , diodes Pj and Dj, capacitors C - C self-magnetization windings.

The frequency multiplier, for example, the quadruple, consists of two elements 1 and 2. These elements differ from each other in the number of turns of the input windings Wi, which allows a phase shift of the input streams by 90 °.

The cores of the frequency multiplier core are saturated with the input voltage, are magnetized at a constant flow, and self-magnetized by the output frequency current and the zero sequence current.

Self-magnetization of the output frequency current using capacitances i, 2 z is necessary to eliminate the phenomenon of self-excitation of an induction motor, jamming at start-up and other unstable processes.

Zero-sequence self-magnetization (in particular, j of the twelfth quadrupler) using capacitors Ci, Cj, and C is necessary to control the power of the output frequency. This increases the stiffness of the output voltage, as well as the stability of the start-up of electric motors.

In addition to the self-magnetization winding, a zero (twelfth) harmonic EMF is induced in the bias winding by direct current. In the analogue and the prototype, a bridge circuit is used to power up the alternating pattern to power the bias winding. With such a rectifying scheme, it is induced in the winding of the magnetic biasing of the zero (twelve) harmonic after half a period of time is closed on the diodes of the rectifier bridge.

As a result, the amplitude of such a zero (twelfth) harmonic in the self-magnetization winding decreases, and its effectiveness decreases.

To eliminate the short-circuit EMF of the zero (twelfth) harmonics, rectifying the alternating voltage of the ED is carried out using the zero-point winding and the diodes connected in opposite.

The rectified voltage is taken from the zero point of the drive winding Wj and the common point of the two diodes D and Dj. The arms of the winding Wj are inductive resistances, thanks to KOTL / eye, the short effect of the zero emf of the zero (twelfth) harmonic on the diodes DI and Dj is eliminated.

However, the current flow is twelfth

harmonics through inductive resistance leads to its magnetization. Therefore, between the zero point of the winding s, the common point of the diodes Dj and Dj includes a capacitor C /, which shunts the inductance of the winding Wj.

As a result of this switching on the winding Wj, the DJI and Dj diodes and the capacitor Sc, the output power of the frequency multiplier increases, which leads to an increase in efficiency and a decrease in the consumption of active materials.

In order to reduce the consumption of active materials, the self-magnetization winding is connected in phases to an open triangle, to the break of which a rectified voltage is applied. Thus, the self-magnetization winding We begins to perform the functions of a bias magnetic winding, since along it, besides the self-magnetization currents of the output and

zero (fourth and twelfth) harmonic, a constant magnetizing current flows.

Combining the two windings into one results in saving the magnet wire, since the effect of current displacement is used. This effect is that direct current flows through the entire conductor cross section and alternating current is displaced onto its surface. Saving the magnet wire leads to a reduction in the magnetic core window, which means that the consumption of electrical steel is reduced.

Claims (2)

Invention Formula A static ferromagnetic frequency multiplier containing three-phase transformers with input and output windings disposed on their rods, as well as paired self-magnetization windings connected to each other through a capacitor of counter-parallel, characterized in that 5 in order to increase efficiency, increase reliability and reduce the consumption of active materials, an auxiliary winding is located on the cores of transformers of one of the phases 60 is a point shunted by a chain consisting of two oppositely connected diodes, with an additional capacitor between the middle point of the auxiliary winding and the common point of the diodes and the indicated self-magnetized windings connected across all three phases to an open triangle. Sources of information taken into account in the examination: 1, Bamdas A.M. et al., Ferromagnetic frequency multipliers, ML, ed. Energy, 1968, 2. USSR author's certificate  497695 CL, And 02 M 5/16, published from 1975.