Servomechanisms Flashcards
Where is the power supply connected to in a synchro system?
The transmitter rotor and amplifier
What is a closed loop system?
A control system that provides a controlled predetermined output from an input.
When a servo has reached its null and stopped, what is the velocity feedback?
Zero
An increase in velocity feedback does what to the speed at which the load moves?
Decreases the speed
In velocity feedback, what is the signal?
Out of phase
An increase in amplitude of a rate feedback signal will cause what?
Reduced hunting
The amount of rate feedback from a tachogenerator is proportional to…
The speed
When a synchro system is in correspondence, it’s transmitter and receiver…
Are in phase
What can a differential synchro be used for?
A transmitter or a receiver
Rate feedback is obtained from…
A tachogenerator
What type of power is used to run a desynn torque motor?
DC (24-28V)
What is the reference phase to a synchro?
400Hz
In regards to phase, what is positive feedback?
In phase with the input
In regards to phase, what is the position feedback signal?
Anti phase with the demand/input
The stator output voltages from a synchro resolver…
Is single phase AC
If a feedback is ideally damped, what happens to the signal?
It overshoots once and comes back
What is a LVDT?
Linear variable differential transducer
- a positional sensor (linear)
What is a RVDT?
A rotary variable differential transducer.
Rotary position sensor, used in Aircraft throttle levers
What is a capacitance transmitter?
A variable capacitor with a rotor and stator.
Capacitance is high when the rotor and stator are fully intermeshed.
What is a rate transducer?
A tachometer.
It is a rate generator that develops an output voltage proportional to its RPM
When is a torque synchro system used?
When torque is low
In a resolver synchro the stator windings are electrically disposed by…
90 degrees
The position feedback from a potentiometer is…
Anti-phase
A basic CX synchro has how many windings on its stator and rotor?
3 on the stator, 1 on the rotor
An inertial mass restrained by a spring is a device for measuring…
Acceleration
What type of transducer uses a piezoelectric crystal?
An analogue transducer
What does a resolver do?
Resolves a position into sine and cosine components
The null point in a control synchro is when the two rotors are…
90° to each other
In a synchro resolver, what angle are the stator coils in relation to each other?
90°
Velocity lag refers to an error in…
Position
