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Moco > 2nd half First Semester > Flashcards

2nd half First Semester Flashcards

1
Q

Mass

A

/32.2

Force due to weight/gravity

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2
Q

Are polyphase/3 Phase AC motors self starting?

A

Yes, multiple phases spaced 120 degrees

A phase spaced 120 apart from B phase spaced 120 apart from C phase

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3
Q

Object

A

Made up of matter, has mass

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4
Q

Permanent Split Capacitor

A

1/120-1 HP

Light starting motor

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5
Q

Commutator is found in ____ type of AC motor

A

Commutator is in wound motors

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6
Q

How does DC motor spin?

A

Interaction of magnetic field of Armature to magnetic field of the field repel and attract causes motor to spin around

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7
Q

Velocity Formula

A

Displacement/time

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8
Q

4 Types of Belts

A
  1. Round
  2. Flat
  3. Synchronous
  4. V Belt
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9
Q

Signal from drive to motor

A

High voltage
High current

+/- 0-180v DC

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10
Q

Worm drive

A

Input shaft will be smaller than output shaft, because less torque on input

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11
Q

Commutator

A

DC motor

Device that changes polarity on the armature every half rotation

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12
Q

Resistance

A

Opposition of flow of electrons

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13
Q

Impedance

A

Total resistance to flow in an AC circuit as result of reactance & resistance

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14
Q

What’s inside VFD?

A

DC rectifier

Filter to clean signal

High speed transistor

Which fabricates a sine wave that’s still DC, allowing us to change frequency

Frequency is what changes speed

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15
Q

What is Octal used for?

A

Memory addressing

Largest number displayed is 377

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16
Q

PWM

A

Pulse Width Modulation fabricates a sine wave with DC power

fooling motor into thinking it’s receiving three phase AC power but it’s DC in pulses

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17
Q

3 types of Speed

A

Fixed speed
Multiple Speed - like HI, LO, MED
Variable Speed

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18
Q

How change direction on 3 Phase motor?

A

Swap 2 phases

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19
Q

2 parts of AC motors

A
  1. Rotor

2. Stator

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20
Q

Armature

A

Rotating part of the DC motor

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21
Q

PLC

A

Programmable Logic Control
aka All-in-one
Aka brick

Industrialized Microprocessor

Before PLC we had relay logic

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22
Q

Average Velocity

A

=(Vi+VF)/2

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23
Q

Shunt DC Motor

A

1 voltage to armature
Different voltage to field
Less voltage will speed up field, more will slow.

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24
Q

3 steps to PLC

A
  1. Checks inputs
  2. Scans program
  3. Writes outputs
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25
Q

Universal Motor

A

1/60–2 HP
Hard starting
AC or DC, brushes
Sewing machines

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26
Q

Potential energy

A

Energy due to position

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27
Q

Insulator

A

Material that has few free electrons

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28
Q

Inductance

A

Property of an electrical circuit that opposes the change in current
-current lags behind voltage

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29
Q

NEMA Standard for running wires

A

1-3 are running’s

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30
Q

Current

A

Amount of electrons passing a particular point over a given time

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31
Q

Why use brushes on commutator?

A

Brushes are carbon & will resist wearing down

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32
Q

Standard rotation

A

Spinning counterclockwise from front

Front = opposite of shaft

33
Q

4 # systems

A

Decimal
Binary
Hexadecimal
Octal

34
Q

NEMA

A

National electrical manufacturers association

35
Q

Stator

A

The coil/stationary part, generates a magnetic field in an AC motor

36
Q

Worm gear

A

Good torque

Will be self locking, will only go in 1 direction

-little more expensive

37
Q

3 types of V Belts

A
  1. Industrial
  2. Agricultural
  3. Automotive
38
Q

NEMA Standard for Starting

A

2-4 are starting

39
Q

Acceleration Formula

A

Final Velocity (VF) - Initial Velocity (Vi)/ time

40
Q

Control system

A

Control->Drive->Motor

41
Q

Capacitor Start Capacitor Run

2 Value Capacitor

A

2-20 HP

Hard starting motor

42
Q

Synchronous Speed (SS)

A

Point at which bars are rotating at same speed as magnetic fields are breaking, then slows down & finds speed at which its happy

SS = (120•Hz)/# of poles

43
Q

Motor

A

Device that converts electrical energy into mechanical energy
-cars have engines, not motors

44
Q

Shorting bars are found in _____ AC motors

A

Shorting bars are found in Squirrel Cage AC motor

Squirrel Cage includes:
Split phase
Capacitor
Shaded Pole

45
Q

Capacitor Start Induction Run

A

Light starting motor
1/250-1/4 HP
Small, not a torquey motor

46
Q

VFD

A

Variable Frequency Drive

47
Q

Open loop control

A

Control system with no feedback to control

48
Q

Feedback card in control

A

Card counts pulses from encoder, determines frequency of pulses which tells us how fast

49
Q

Single Phase AC motors

A

Single phase:

  • synchronous
  • induction:
    • wound
    • squirrel cage:

Squirrel Cage:

  • split phase
  • shaded pole
  • capacitor:
  • capacitor Start induction run
  • capacitor start capacitor run aka 2 value capacitor
  • permanent split capacitor
50
Q

3 Phase motor

A

1/12-200 HP

Hard starting motor

51
Q

Reason we use DC motors

A

Speed control is extremely simple, speed is controlled through voltage

52
Q

Voltage

A

Potential difference between two points

53
Q

Commutation

A
  • passing from one state to another

- in DC motors, commutation is done with brushes and commutator

54
Q

Signal from control to drive

A

Low voltage
Low current
Analog

+/- 0-10v DC, can get speed and direction out of 1 signal

55
Q

Shaded Pole Motor

A

Small lightweight motor
Low Horsepower

Will only run in 1 direction

Not reversible because of where heavy coil is wrapped around

56
Q

Mnemonics for PLCs

A 
LOD
OUT
SET
RSET
CNT
TIM
57
Q

3 types of DC motors

A
  1. Series
  2. Shunt
  3. Permanent Magnet
58
Q

Centrifical Switch

A

On starting winding

N.C. Switch that once motor gets to 75% of SS, this will open up

59
Q

Induction

A

When wire passes through magnetic field, it will induce electron flow

60
Q

Starters must have _____

A

Overload protection to be legally called a starter

Overload is what makes it a starter

61
Q

Parts of DC motor

A

Armature

Field

62
Q

How to get inductance on motor

A

Using bigger wire on one coil

Wire to one coil must have big wire with few coils, wire to other coil smaller skinnier with lots of wraps

Thicker wire has more inductance

63
Q

Heaters

A

Aka Overloads

When draw too much current, they get hot and trip

64
Q

What are the 2 signals going from Control-Drive?

A
  1. Enable Signal

2. Position/speed

65
Q

3 types of AC Motors

A

Single Phase
3 Phase aka Polyphase
Universal

66
Q

Power

A

Rate at which we do the work in Horsepower

67
Q

IMA’s other name

A

Velocity Ratio

68
Q

Kinetic Friction

A

Once we exceed the point of impending motion

69
Q

Rotor

A

The rotating part of an AC motor

70
Q

Low voltage is __v or less

A

24v or less

71
Q

Capacitance

A

Property of an electrical circuit that opposes the change in voltage
-voltage lags behind current

72
Q

Field

A

The horse shoe magnet on DC motor

73
Q

Semi conductor

A

Some properties of insulator and conductor

74
Q

P.I.D.

A

Proportional
Integral
Derivative

75
Q

Turntable encoder

A

Digital Optical Incremental Encoders

76
Q

Reactance

A

Opposition of alternating current as a result of either inductance or capacitance

77
Q

Split phase

A

Medium load starting

3/4 HP small

78
Q

Conductors inside rotor

A

Shorting Bars

Moco (4 decks)

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