Lecture 10 applications of synchros

applications of synchros

1. ICE 3015: CONTROL SYSTEM
COMPONENTS
Class 10: Applications of Synchros
Dr. S. Meenatchisundaram
Email: [email protected]
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

2. Control Transformers:
• A synchro control transformer (CT) functions as a position
transducer and error detector.
• The difference in angular positions of the two shafts is use d to
detect error voltage and correction is applied.
• The synchro generator (transmitter) has the following dif ference:
1. The rotor is circular shape product to distribute uniform ly the
magnetic flux in the air gap.
2. The stator windings have a number of turns of fine wire so as
to have a high input impedance drawing very little current.
• In this way sufficient high voltage is sought to be obtained even
for single turns of the rotor.
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal, Aug
–
Nov 2018

3. Control Transformers:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal, Aug
–
Nov 2018

4. Control Transformers:
• The two inputs of the control transformer are the stator vol tage
from the synchro transmitter and the position of the two shaf ts,
which are aligned.
• The stator voltage of the transmitter generated by the rotor of
transmitter is also applied to the stator of the control tran sformer.
• This set up a magnetic field within the device.
• The rotor of the CT is kept horizontal at right angles to the s tator
windings S
2
so that zero voltage is induced in the rotor.
• If the aligned shafts of the two Synchros are disturbed and r otor
moves counter clockwise, magnetic flux lines are cut and vol tage
is induced in the rotor coil.
• The induced voltage will reach a maximum for rotor position of 90
degree from the horizontal.
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal, Aug
–
Nov 2018

5. Control Transformers:
• The output voltage of the rotor winding will be sinusoidal a nd can
be given as
E
R
= E
max
sin (ɵ
0
-ɵ
i)
Where,
E
max
– Maximum rotor voltage
ɵ
0
-ɵ
i
– difference in angle between CT and CX.
• As the output is sinusoidal, it is non linear but can be consi dered
as linear for 20°or less.
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal, Aug
–
Nov 2018

6. Torque Synchro System:
• A torque transmitter (TX) and a torque receiver (TR) make upa
simple torque-synchro system.
• Basically, the electrical construction of synchro transm itters and
receivers is similar, but their intended functions are diff erent.
• The rotor of a synchro transmitter is usually geared to a man ual or
mechanical input.
• This gearing may drive a visual indicator showing the valueor
quantity being transmitted.
• The rotor of the receiver synchronizes itself electricall y with the
position of the rotor of the transmitter and thus responds to the
quantity being transmitted.
• A synchro transmission system consisting of a torque transmitter
connected to a torque receiver (TX-TR) is illustrated in fig ure.
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

7. Torque Synchro System:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

8. Torque Synchro System:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

9. Receiver Rotation:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

10. Torque Differentials:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

11. Torque Differentials:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

12. TX-TDX-TR System Operation:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

13. TX-TDX-TR System Operation:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

14. TX-TDX-TR System Operation:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

15. TX-TDX-TR System Operation:
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018

16. References:
•Navy Electricity and Electronics Training Series (NEETS)
Module 15—Principles of Synchros, Servos, and Gyros
http://www.rfcafe.com/references/electrical/NEETS- Modules/NEETS-Module-15-1-1-1-10.htm
Control System Components (ICE 3015)
Dr.
S.Meenatchisundaram
, MIT, Manipal,
Aug
–
Nov 2018