ircraft with AC power generation systems make use of AC autosyn (using electromagnets) or AC Magnesyn (using permanent magnets) systems. The operation of both systems is similar to that of the DC Selsyn system, but using an AC power source (generally 26VAC @ 400Hz) rather than a DC one. The use of an AC power source allows autosyn and magnesyn systems to utilise electromagnetic induction rather than the changing resistance (using the brushed contacts) of the DC Selsyn system. The magnesyn system uses a permanent magnet rotor, attached either directly to the rotating shaft of the component being indicated, or indirectly, through some form of gearing. As the soft iron core of the transmitter comes out of saturation, (as the AC voltage varies towards zero) the magnetism induced in the core can be affected by movement of the permanent magnetic field produced by the rotor’s permanent magnet. The overall result is that movement of the rotor’s permanent magnet causes differing currents to be induced in the coils of the transmitter around the circular toroidal path. The varying currents are ‘transmitted’ and replicated in the indicator coils. The two permanent magnets will always be aligned – the indicator following the movement of the transmitter. The indicator’s pointer consequently moves in relation to the alignment of the indicator’s permanent magnet.
by slilbaekslilbaek
officialahmady created this project
2 months ago