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11/18/2014 Salient pole rotor vs. non-salient pole rotor | electricaleasy.com http://www.electricaleasy.com/2014/03/salient-pole-rotor-vs-non-salient-pole.html 1/6 Categories AC Machines Transformer DC Machines Induction Motor Synchronous machines Electrical laws Popular Posts Basic construction and working of a DC Generator. AC generator (alternator) - construction and working Speed control methods of DC motor Electrical Transformer - Basic construction, working and types By Kiran Daware AC Machines, DC Machines Synchronous Machines 1 Comment Tweet 1 6 Salient Pole Rotor Vs. Non- Salient Pole Rotor Rotors of an electrical machine are classified as: (i) Salient pole rotors and (ii) Non-salient pole rotors. Both types are explained below. Salient Pole Rotor 25 Share Home ONE About
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Page 1: Salient pole rotor vs. non salient pole rotor   electricaleasy

11/18/2014 Salient pole rotor vs. non-salient pole rotor | electricaleasy.com

http://www.electricaleasy.com/2014/03/salient-pole-rotor-vs-non-salient-pole.html 1/6

Categories

AC Machines Transformer

DC Machines Induction Motor

Synchronous machines

Electrical laws

Po pula r Po s ts

Basic construction and

working of a DC

Generator.

AC generator

(alternator) -

construction and

working

Speed control methods

of DC motor

Electrical Transformer -

Basic construction,

working and types

By Kiran Daware AC Machines, DC Machines,

Synchronous Machines 1 Comment

Tweet 1

6

Salient Pole

Rotor Vs. Non-

Salient Pole

Rotor

Rotors of an electrical machine are

classified as: (i) Salient pole rotors and (ii)

Non-salient pole rotors. Both types are

explained below.

Salient Pole Rotor

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Page 2: Salient pole rotor vs. non salient pole rotor   electricaleasy

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Open circuit and Short

circuit Test on

transformer

Universal Motor -

construction, working

and characteristics

Salient pole rotor vs.

non-salient pole rotor

Characteristics of DC

Generators

Characteristics of DC

motors

Sumpner's test or Back-

to-Back test on

Transformer

In salient pole type of rotor consist of

large number of projected poles (salient

poles) mounted on a magnetic wheel.

Construction of a salient pole rotor is

as shown in the figure at left. The

projected poles are made up from

laminations of steel. The rotor winding is

provided on these poles and it is

supported by pole shoes.

Salient pole rotors have large

diameter and shorter axial length.

They are generally used in lower

speed electrical machines, say 100

RPM to 1500 RPM.

As the rotor speed is lower, more

number of poles are required to

attain the required frequency. (Ns =

120f / P therefore, f = Ns*p/120

i.e. frequency is proportional to

number of poles). Typically number

of salient poles is between 4 to 60.

Flux distribution is relatively poor

than non-salient pole rotor, hence

the generated emf waveform is not

as good as cylindrical rotor.

Salient pole rotors generally need

damper windings to prevent rotor

oscillations during operation.

Salient pole synchronous

generators are mostly used in

hydro power plants.

Non-Salient Pole

(Cylindrical) Rotor

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Page 3: Salient pole rotor vs. non salient pole rotor   electricaleasy

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(Cylindrical) Rotor

Non-salient pole rotors are cylindrical

in shape having parallel slots on it to

place rotor windings. It is made up of

solid steel. The construction of non-

salient pole rotor (cylindrical rotor) is

as shown in figure above. Sometimes,

they are also called as drum rotor.

They are smaller in diameter but

having longer axial length.

Cylindrical rotors are used in high

speed electrical machines, usually

1500 RPM to 3000 RPM.

Windage loss as well as noise is less

as compared to salient pole rotors.

Their construction is robust as

compared to salient pole rotors.

Number of poles is usually 2 or 4.

Damper windings are not needed in

non-salient pole rotors.

Flux distribution is sinusoidal and

hence gives better emf waveform.

Non-salient pole rotors are used

in nuclear, gas and thermal power

plants.

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Starting methods of

a DC motor

Electric braking of

DC motors

Synchronization of AC generator

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alternator (alternator) -

constru...

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- construction an...

Double squirrel

cage motor

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SEP 26, 2014, 11:29:00 AM

good

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