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Topic starter
2021-05-01 9:20 pm
SYNCHROS "SELSYNS" as Input Devices - In this case, the SYNCHROS or “SELSYNS” are used measuring the exact position of these SYNCHROS, moved by mechanical movement inputs, such as done by the SET ALTITUDE INDICATOR.
In my example of the shown SET ALTITUDE INDICATOR, there are the following devices:
1x CLIFTON SYNCHRO DIFFERENTIAL RESOLVER – Type CDSH-IO-QS-4/F321
Rotor: 3 Phases 11.8 V 400 Hz - 4 wires black - red – blue - yellow
Stator: 2 Phases 26 V 400 Hz - 3 wires black/white - blue/white - yellow/white
1x CLIFTON CONTROL TRANSMITTER– Type No. CTH-IO-QS-4/F323
Rotor: 1 Phase 23.5 V 400 Hz - 2 wires black/white- red/ white
Stator: 3 Phases 11.8 V 400 Hz - 3 wires black – yellow - blue
Most probably, the Differential Resolver is used to move a second, identical Set Altitude Indicator on the co-pilots side to identical settings.
As shown in literature, 400 cycles are used in aeronautics and naval industry to reduce the size of electronic parts and diameter in cabling to reduce weight. Therefore 60 Hz signals cannot be used to drive these instruments, otherwise the small coils would burn because of current increase.
I would like to decode the synchro positions by Arduino, to obtain a numerical output.
If possible, I would like to move the instrument on the co-pilots side to identical settings, too.
Any help would be appreciated.
In advance, many thanks.
Peter
2021-05-02 12:31 am
For those like me who don't know anything about a selsyn.
https://www.elektroda.com/rtvforum/topic2979815.html
https://hackaday.com/2018/04/25/retrotechtacular-synchros-go-to-war-and-peace/
https://www.allaboutcircuits.com/textbook/alternating-current/chpt-13/selsyn-synchro-motors/
Is this what the question wants answered?
Turn down the pc volume before running the video if you suffer from tinnitus!!
Topic starter
2021-05-02 12:58 am
Many thanks, robotBuilder.
This are great links and I will carefully analyze them. Some videos, I remember that I have just seen on the internet. By the sound they make, it seems that they use sound amplyfiers to give the 400 Hz sinus curves for driving the 3 stator coils.
I prefer another approach: I want to use PWM square waves from the arduino to create magnetic fields in the coils, one permanent magnetic field in the rotor and 3 changeing magnetic fields in the stator coils, depending on the position of the indicator needle. - This is for the use of synchros as output devices.
Using them as input device, I think to use permanent PWM-square waves on the rotor and analyze the 3 resulting waves from each coil, generated by the magnetic field, by the arduino.
For both problems, I am searching primarily for suitable arduino codes.
Many thanks for your post.
Peter