Synchro / Servo Flashcards
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What is a synchro servo combination at a high level?
When you move the synchro, it induces a current signal in the windings in the stator which are transmitted to the servo to move something else.
Explain how a transformer works
A coil indcuces a magnetic flux in the transformer core. The magnetic flux induces a current in the opposite coil. The change in current results in a change in voltage across the coils.
Less coils on the output: proportionally lower voltage.
How does a syncrho work?
A rotating transformer (inductive motor) produces an output voltage depending on its angular position.
It is like a transformer in that there is a shared (induced) magnetic field.
Describe Synchro Pair
The Synchro pair measures and compares two angular displacement and its output voltage is linear with the angular difference.
What is torque type Synchro?
Has a small output torque, used for running light loads like a dial or gage.
What is a Control Type Synchro?
Used for diriving large loads eg. radar director, gun turret.
Why are marine and air applications of synchros operated at 400Hz?
More fidelity because there is less time per cycle so it has a higher sampling rate.
How do we provide a digital readout instead of using synchros?
Rotary encoders!
How does a control transformer work?
The TR is connected to an large AC servo motor…not sure
What is “Racking a synchro”?
Zeroing the TX and TR
List some Pros and Cons of synchro pairs
Pro:
Low failure rates, high life expectancy
Speed ins constant of load
Can measure small angluar displacement
Con:
High cost per kW
Analogue in a digital world
