Briefly about the selsyns. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Briefly about the selsyns. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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The proposed article provides brief information about the purpose and device of the selsyns, as well as some background information about them. This information will be useful to radio amateurs when building directional antennas.

Introduction to radiosport, both in my youth and now, is an expensive business. Therefore, we build antennas with our own hands. When repeating the design of the rotary device for the "UNZHA-1" mast of the radio amateur V. Banishevsky (RU3HD), oddly enough, the problem was caused by the lack of sufficient knowledge about the selsyns. I had to search hard for any information about them on the Internet and from familiar radio amateurs. I came across a pamphlet "Information micromachines of tracking and computing systems" (M. V. Baklanov, V. A. Lyska, V. V. Alekseev, 1977), which turned out to be very useful. I chose what I considered the most useful for practical application, and I present it for a general review.

Selsyns are induction electrical machines that allow, at a constant input voltage amplitude, to obtain a system of voltages on the output windings, the amplitude and phase of which are determined by the angular position of the rotor (selsyns-sensors), or, conversely, to convert such a voltage system into the corresponding angular position rotor (indicating synchro-receivers) or into a voltage, the phase and amplitude of which are a function of the system of output voltages and the angle of rotation of the rotor (transformer synchro-receivers).

Selsyns according to their functional purpose are divided into selsyns-sensors (SD), differential selsyns-sensors (SDD), indicator selsyns-receivers (SPI), differential indicator selsyns-receivers (SPDI), transformer selsyns-receivers (SPT).

SM and SPT can be single-channel with two-pole synchronization windings and two-channel - with two-pole (coarse channel) and multi-pole (fine channel) synchronization windings. There are also double SPIs, which are a mechanical connection of two SPIs in one housing.

By the nature of the current collection (current lead-water), the synchros can be contact and non-contact. The connection of the synchros to power sources and the electrical connections of the windings are made in accordance with their electrical diagrams (Fig. 1-5). Almost all synchro-sensors, transformer and indicator synchro-receivers are made according to the scheme shown in fig. 1, and all differential selsyns - according to the scheme in fig. 2. According to the diagram in fig. 3 made non-contact synchro with a ring transformer. On fig. 4 shows transitional synchro-transformers, and in fig. 5 - two-channel synchro-sensors and synchro-receivers.

Briefly about the selsyns

Products of earlier developments may have terminal markings that differ from the designations adopted in the figures. Instead of B1B2, there may be designations P1P2 or C1C2, and instead of C1C2C3, designations F1F2Fz or P1P2P3- Small-sized synchros usually have digital marking of the outputs.

The main parameters of the synchros produced in the 80s are shown in the table.

(click to enlarge)

Author: S. Savinov (RA6XPG), Prokhladny, Kabardino-Balkaria

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