SU547014A1 - Static frequency multiplier - Google Patents

Description

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This invention relates to the field of electrical engineering.

A static frequency converter is known with a magnetic core made of an alternating current type magnetic circuit, in the slots of which are located the primary multiphase winding and the secondary winding made with the number of poles twice as large as the number of poles of the primary winding and the bias 1J is located on the magnetic core.

A converter is also known, in which a three-phase winding is made drum with two parallel branches shifted in space by 360 el. grad., and with two zero points, and the DC source is connected to zero points 2.

However, the known converters have large weight and dimensions.

To reduce the weight and dimensions in the proposed frequency multiplier, each parallel winding branch is made of two coil groups, wrapped around them, ring-shaped from the core core and shifted one relative to the other at an angle of 90 el. hail., and to the sheath, they are connected to the terminals of the coil groups load.

FIG. 1 shows the magnetic core of the described frequency multiplier with a winding located in its grooves; in fig. 2 is a schematic of a frequency multiplier circuit; in fig. 3 shows the direction of the direct bias current in the winding coils and the bias current generated by them; in fig. four-

vector diagrams e. d. frequency / s in fig. 5 - the same frequency.

The magnetic circuit multiplier frequency (see Fig. 1) consists of a package of stator 1 and the rotor 2 of a conventional asynchronous machine, which are fixed to each other fixedly. A ring winding is wound on the stator 1 package, consisting of coils 3-14. Each phase of the winding consists of two parallel branches, shifted one relative to

another in space at 180 e. hail. The winding (see Fig. 2) is connected to a double star with independent zero points 15 and 16. Each parallel branch of the phase of the winding consists of two coil groups, for example

3 and 6, 9 and 12, wrapped around the ring-shaped rmo core and shifted one relative to the other at an angle of 90 el. hail., to the common terminals 17–22 of which the load is connected, and to the input terminals 23–25 the power supply network is connected by the frequency / i. A DC power supply is connected to the zero points 15 and 16.

The imposition of a constant floor on a rotating variable creates in the magnetic circuit

even spatial harmonics of the Horo magnetic flux, rotating at the speed of the main FIELD. With respect to the input terminals 23–25, the multiplex winding is three-phase with the number of poles PI, and with respect to the zero points 15 and 16 - single-phase annular with three parallel branches. When a direct current is applied to the zero points, a constant toroidal magnetic field is generated, closing along the pole (see Fig. 3). When a constant field is applied to a rotating field in the field, the total magnetic field is distorted in the air gap, besides the main harmonic, there is a second harmonic with a number of pole pairs, which induces in the winding e. d. frequency / 2 2/1. FIG. 4 and 5 indices denoted by e. the village, induced in the corresponding winding coils, and the indices EA, EB, EU - e. d. in the respective phases of the winding.

From FIG. 2 that, for frequency i, the winding of the multiplier is also three-phase with two parallel branches.

Thus, in the proposed frequency multiplier, one winding performs the functions of three windings: the primary winding, which is connected to a three-phase current source.

secondary (output) winding and bias winding. This makes it possible to reduce the weight and dimensions of the static frequency multiplier.

F o rm} l and inventions

Static frequency multiplier with a circular magnetic core, in the slots of which

there is a winding with two parallel branches connected in a double star with independent zero leads to which a DC source is connected, characterized in that, in order to reduce the weight and size, each parallel winding branch is made of two coil groups wrapping around the ring core and shifted one relative to the other at an angle of 90 e. hail

common terminals of the coil groups connected load.

Sources of information taken into account in the examination:

1. Author's certificate number 133108, cl. 21d2 14/01, I960.

2. The copyright certificate number 205135, M. Kl.2N 01F 35/00, 1973.

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