Hi,
A DC Synchro
8.1 DC synchro
The DC synchro consists of a transmitter and receiver as illustrated in FIG. 28. The transmitter is wire-wound circular resistance with three pick offs. The input shaft (of the device being monitored) is attached to the two contacts that slide across the resistance windings. These contacts are insulated from each other and connected to the power supply. The receiver contains a permanent magnet attached to a shaft; the magnet is positioned within three stator windings. DC synchros are known by various trade names including Selsyn and Desyn.
With the two contacts in the positions shown in Fig. 28 , the power supply current enters the resistor at point A, current flows into the top coil (A) of the receiver and splits into the lower coils (B and C). This current sets up three magnetic fields around each of the three coils; the permanent magnet in the receiver takes up a position that aligns with the resulting magnetic field. A pointer attached to the receiver shaft moves to a position inside the indicator. When the input shaft of the transmitter is rotated, the contacts move to a new position. This alters the balance of currents through the resistance windings resulting in a change of currents in the receiver coils. The resulting magnetic flux rotates and the permanent magnet aligns to the new direction, moving the pointer to a different position.
Key maintenance point
The DC synchro suffers from contact wear on the resistance windings; this can lead to spurious operation.
An Arduino solution would help.
Is this for an active aircraft, or a simulator..
Tom.. 