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Module 4 - Electronic Fundamentals B1 > Servomechanisms > Flashcards

Servomechanisms Flashcards

1
Q

Where is the power supply connected to in a synchro system?

A

The transmitter rotor and amplifier

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2
Q

What is a closed loop system?

A

A control system that provides a controlled predetermined output from an input.

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3
Q

When a servo has reached its null and stopped, what is the velocity feedback?

A

Zero

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4
Q

An increase in velocity feedback does what to the speed at which the load moves?

A

Decreases the speed

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5
Q

In velocity feedback, what is the signal?

A

Out of phase

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6
Q

An increase in amplitude of a rate feedback signal will cause what?

A

Reduced hunting

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7
Q

The amount of rate feedback from a tachogenerator is proportional to…

A

The speed

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8
Q

When a synchro system is in correspondence, it’s transmitter and receiver…

A

Are in phase

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9
Q

What can a differential synchro be used for?

A

A transmitter or a receiver

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10
Q

Rate feedback is obtained from…

A

A tachogenerator

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11
Q

What type of power is used to run a desynn torque motor?

A

DC (24-28V)

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12
Q

What is the reference phase to a synchro?

A

400Hz

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13
Q

In regards to phase, what is positive feedback?

A

In phase with the input

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14
Q

In regards to phase, what is the position feedback signal?

A

Anti phase with the demand/input

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15
Q

The stator output voltages from a synchro resolver…

A

Is single phase AC

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16
Q

If a feedback is ideally damped, what happens to the signal?

A

It overshoots once and comes back

17
Q

What is a LVDT?

A

Linear variable differential transducer

- a positional sensor (linear)

18
Q

What is a RVDT?

A

A rotary variable differential transducer.

Rotary position sensor, used in Aircraft throttle levers

19
Q

What is a capacitance transmitter?

A

A variable capacitor with a rotor and stator.

Capacitance is high when the rotor and stator are fully intermeshed.

20
Q

What is a rate transducer?

A

A tachometer.

It is a rate generator that develops an output voltage proportional to its RPM

21
Q

When is a torque synchro system used?

A

When torque is low

22
Q

In a resolver synchro the stator windings are electrically disposed by…

A

90 degrees

23
Q

The position feedback from a potentiometer is…

A

Anti-phase

24
Q

A basic CX synchro has how many windings on its stator and rotor?

A

3 on the stator, 1 on the rotor

25
Q

An inertial mass restrained by a spring is a device for measuring…

A

Acceleration

26
Q

What type of transducer uses a piezoelectric crystal?

A

An analogue transducer

27
Q

What does a resolver do?

A

Resolves a position into sine and cosine components

28
Q

The null point in a control synchro is when the two rotors are…

A

90° to each other

29
Q

In a synchro resolver, what angle are the stator coils in relation to each other?

A

90°

30
Q

Velocity lag refers to an error in…

A

Position

Module 4 - Electronic Fundamentals B1 (5 decks)

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