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Q5(a) Differentiate between Induction and Synchronous motors. (5 marks) A generator shown in Figure 05(b) with no-load freque

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Answer #1

A)

ASPECT OF DIFFERENCE SYNCHRONOUS MOTORS INDUCTION MOTORS
EXCITATION Doubly Excited ( AC on stator + DC on the Rotor ) Singly Excited ( Only AC on Stator)
SPEED

Synchronous Speed ( So Constant Speed only )

Also Speed is load Independent

Slip Speed ( So can have Variable Speeds)

Speed is Load Dependent

STARTING AID NEED Need Starting Aid ( like Pony or Dummy motors , Damper Windings) Self Startng Motor
EFFICIENCY High Comparitively Low
POWER FACTOR RANGE Wide Range ( From Lead To Lag ) Only Lag Power Factor

B)

(s LOAD1 P (Mw) LOAD 2 60㎐ Sp

C)

DC machines are selected as per various factors Like

a)Types of Drive they will Operate

The Series motor Are Suitable For Constant Power Drives

The Shunt motor Are Suitable For Constant Speed Drives

b) As per Resistance of Armature and Field

This is significant in machines when our concern is to Limit The Copper Losses

c) As per Voltage Regulation Need

In DC Generators where we may need Various Regulation as per Electrical Load connected and our needs   

d) As per Power Rating Need For Corresponding Usage

APPLICATIONS :

Series DC Machine : Traction motors , Conveyors As Motors

Negative  Voltage Regulation As Generators

Shunt DC Machine : Machine Tools and Lathe , Shearing , Pumps As Motors

Positive Voltage Regulation As Generators

Compound DC Machine : Lifts , Rolling Mills And Pressing

Induction Motor : Electric Cars , Traction

Synchronous Motor : As Phase Correction Device , Trains , Escalators

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