How Do I Wire My Plane?
Single phase units have five wires: These three are bussed to the other synchros in the system, and provide the power and information to align the shafts of all the receivers. Synchro transmitters and receivers must be powered by the same branch circuit, so to speak; the mains excitation voltage sources must match in voltage and phase.
The safest approach is to bus the five or six lines from transmitters and receivers at a common point. Different makes of selsyns, used in interlock systems, have different output voltages.
In all cases, three-phase systems will handle more power and operate a bit more smoothly. Many synchros operate on 30 to 60 V AC also. Synchro transmitters are as described, but 50 and Hz synchro receivers require rotary dampers to keep their shafts from oscillating when not loaded as with dials or lightly loaded in high-accuracy applications. A different type of receiver, called a control transformer CT , is part of a position servo that includes a servo amplifier and servo motor.
The motor is geared to the CT rotor, and when the transmitter's rotor moves, the servo motor turns the CT's rotor and the mechanical load to match the new position. CTs have high-impedance stators and draw much less current than ordinary synchro receivers when not correctly positioned. Synchro transmitters can also feed synchro to digital converters, which provide a digital representation of the shaft angle.
So called 'brushless synchros' use rotary transformers that have no magnetic interaction with the usual rotor and stator to feed power to the rotor. These transformers have stationary primaries, and rotating secondaries. The secondary is somewhat like a spool wound with magnet wire, the axis of the spool concentric with the rotor's axis.
The "spool" is the secondary winding's core, its flanges are the poles, and its coupling does not vary significantly with rotor position. The primary winding is similar, surrounded by its magnetic core, and its end pieces are like thick washers. The holes in those end pieces align with the rotating secondary poles.
For high accuracy in gun fire control and aerospace work, so called multi-speed synchro data links were used. For instance, a two-speed link had two transmitters, one rotating for one turn over the full range such as a gun's bearing , while the other rotated one turn for every 10 degrees of bearing.
The latter was called a speed synchro. Of course, the gear trains were made accordingly. At the receiver, the magnitude of the 1X channel's error determined whether the "fast" channel was to be used instead.
A small 1X error meant that the 36x channel's data was unambiguous. Once the receiver servo settled, the fine channel normally retained control.
So called multispeed synchros have stators with many poles, so that their output voltages go through several cycles for one physical revolution. For two-speed systems, these do not require gearing between the shafts. Differential synchros are another category. They have three-lead rotors and stators like the stator described above, and can be transmitters or receivers.
A differential transmitter is connected between a synchro transmitter and a receiver, and its shaft's position adds to or subtracts from, depending upon definition the angle defined by the transmitter.
A differential receiver is connected between two transmitters, and shows the sum or difference, again as defined between the shaft positions of the two transmitters. There are synchro-like devices called transolvers, somewhat like differential synchros, but with three-lead rotors and four-lead stators.
A resolver is similar to a synchro, but has a stator with four leads, the windings being 90 degrees apart physically instead of degrees. Its rotor might be synchro-like, or have two sets of windings 90 degrees apart. Although a pair of resolvers could theoretically operate like a pair of synchros, resolvers are used for computation. A special T-connected transformer arrangement invented by Scott "Scott T" interfaces between resolver and synchro data formats; it was invented to interconnect two-phase AC power with three-phase power, but can also be used for precision applications.
From Wikipedia, the free encyclopedia. This article is about the transformer. For other uses, see Synchro disambiguation. Schematic of a synchro transducer. The complete circle represents the rotor. The solid bars represent the cores of the windings next to them. Power to the rotor is connected by slip rings and brushes, represented by the circles at the ends of the rotor winding. Navy Manual, Chapter In-circuit debugging offers these benefits: Low cost Minimum of additional hardware needed for debug Expensive sockets or adapters are not required True Requires Compiler Support.
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