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Motion Control > Section 3 > Flashcards

Section 3 Flashcards

1
Q

._____ is the movement of the load by the actuator as it attempts to follow a changing command signal in a motion – control system.

A

tracking

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2
Q

A leadscrew mechanism converts __ ___ motion into __ ___ motion.

A

rotary to linear

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3
Q

List three factors that impede acceleration or deceleration.

A

friction
inertia
gravity

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4
Q

List three devices that are used to enter data into an operator interface device.

A

keyboard terminal

thumb wheels

switch panels

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5
Q

A common application of a _____ is to run a conveyor belt.

A

belt drive

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6
Q

The direction that the housing of a rolling ring drive moves is determined by the_____ .

A

direction rings are pitched

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7
Q

Which of the actuator transmission systems are capable of multiplying rotary speed from the input shaft to the output mechanism?

choose all that apply

A

not belt drive?
JUST Gear box
not rack and pinion

direct drive

leadscrew

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8
Q

The_____ is self-breaking, which enables it to hold a load in a stationary position .

A

worm and wheel

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9
Q

List the five major elements of a closed-loop motion-control system.

A 
Operator interface
Controller
Amplifier
Actuator
Feedback
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10
Q

An inductosyn measures __ __ motion.

A

linear

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11
Q

A hydraulic actuator is a ___ device.

A

linear or rotary

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12
Q

AC drives perform the operation of which element in a motion-control closed-loop system?

Choose all that apply

A

everything but the actuator

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13
Q

The load movement lagging behind the desired movement specified by the command signal is called___.

A

following error

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14
Q

An open-loop configuration considered a servo system

A

is NOT

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15
Q

The direction at which the object being measured moves in relation to the housing of a linear

A

polarity of produced voltage

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16
Q

Convert Gray code number 1000 to an equivalent binary number.

A

to convert from grey to binary
you drop most sigbit and XOR with that bit and next but

1111

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17
Q

The number of degrees per count in an incremental optical encoder is called _____.

A

resolution

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18
Q

Which of the following parameters is measured by a tachometer?

chose all that apply

A

RPM

AND

Direction

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19
Q

A one-track incremental encoder is capable of measuring direction.

A

F

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20
Q

The Wiedemann effect is a _____ action caused by the interaction between two magnetic fields

A

twisting

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21
Q

Which of the following parameters is measured by the optical encoder?

A

all provided answers

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22
Q

Which of the following parameters is measured by a resolver?

A

all answer

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23
Q

An advantage of an absolute optical encoder is that if power is lost and then restored, it is
not necessary to re-establish a reference point.

A

true

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24
Q

wire rope transducer uses _____ to measure velocity

A

tachometer

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25
Q

List two ways an incremental optical encoder can measure velocity.

A

measuring time interval between pulses

or counting pulses within a time period

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26
Q

Where is the rotor positioned over the sections of the receiving board when the angular displacement
transducer produces 0 volts?

A

The rotor is positioned equally across the two sections of AB and CD with an equal area

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27
Q

The operation of an inducrosyn is similar to that of a resolver.

A

TRUE

28
Q

What is the function of the Schmitt trigger in an optical encoder?

A

convert pulses from phototransistor into sqaure waves

29
Q

Logic circuits that convert binary numbers to gray code, or vice versa, use _____ gates.

A

XOR

30
Q

The best type of position device to use in conditions where there is extreme heat, humidity, and
dirt is the _____ .

A

NOT pot

resolver

31
Q

It is possible to correct an underdamped condition of a position servo by the system gain.

A

decreasing

32
Q

The characteristics of a servomechanism pertain to the condition of the load when it is moving.

A

dynamic

33
Q

When equilibrium is reached in a servo system, the error signal becomes zero.

A

position

34
Q

A current loop in a position-control application has a bandwidth.

A

HIGH

35
Q

In a closed-loop velocity servosystem with a tachometer, if the load slows the motor down, the error signal (increases, decreases).

A

increases

36
Q

A bang-bang position servo is used in applications.

A

hi speed

37
Q

A _____ provides a better braking action in a point-to- point position system.

A

derivative

38
Q

In the figure What is the purpose of the three exclusive-OR gates?

A

converting grey code to binary

39
Q

The linear motion-control feedback transducer used by the electrohydraulic system in the Figure is a(n)_____

A

LVDT

40
Q

Feed-forward the following error signal in a position servosystem.

A

decreases

41
Q

Another term for speed regulation of a closed-loop velocity control system is _____.

A

stability

42
Q

In a slow-moving contouring application, the _____ mode provides high stiffness during travel.

A

NOT derivative

integral

43
Q

A position servo has a zero bandwidth.

A

proporitonal

44
Q

List the four types of static characteristics.

A

accuracy
Response
Repeatbiolit
Stiffness

45
Q

In Figure 26-8, the LVDT produces a voltage that is the polarity as the output of the D/A converter.

A

opposite!

46
Q

Indexers perform the operation of which element in a motion-control closed-loop system?

A

CONTROLLER

47
Q

Which of the following parameters primarily maintain speed regulation?

A

velociy control

48
Q

In an XYZ system, if two axes movements control horizontal position, which axes controls the vertical position?

A

Z

49
Q

Linear measurements can also be made by Rotary detectors.

A

TRUE

50
Q

The actuator of a/an _____-loop system is activated when the command signal or a disturbance occurs.

A

clsoed

51
Q

A potentiometer is considered a precision measuring device.

A

true

52
Q

A potentiometer is capable of measuring velocity.

A

false

53
Q

The _____ of an LVDT is physically attached to the object being measured for position.

A

iton core

54
Q

5 bit grey code can divide into

A

32 at 11.25 degrrees

55
Q

The linear velocity transducer produces a voltage that is _____ proportional to the speed of the magnet.

A

directly

56
Q

Assuming that the system gain of a position servo remains unchanged, the transient response time if the load inertia is decreased.

A

increase

57
Q

If a master axis slows down on a rewinder paper machine in a master–slave velocity servo, it is likely that the slave axis will

A

speed up

58
Q

The following error in a contouring position control application is .

A

minimal

59
Q

List the two ways in which gain adjustments can be made when tuning a servosystem.

A

potentiamoter or

value picked from software

60
Q

When a setpoint command signal is held constant and the motor that the system is driving is rotating at a steady speed, the _____ amplifier output is zero.

A

derivative

61
Q

A decelerating braking action called _____ prevents the load in a position servo from overshooting its end point.

A

damping

62
Q

When input A of the magnitude comparator is less than input B, the motor turns.

A

CCW

63
Q

A rack-and-pinion transmission system converts __ ___ motion into __ __ motion.

A

rotary

;inear

64
Q

lA feedback potentiometer is a linear feedback device.

A

TRUE

65
Q

The LVDT uses transformer action to measure position

A

true

66
Q

In the Figure, if the setpoint potentiometer applies +7 V to the summing op amp when the feedback potentiometer applies –12 V to the other summing amplifier input, the rack will move _____

A

Right

Motion Control (4 decks)

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