Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
Speed and Frequency of an Alternator
Synchronous Machines
The frequency of induced emf in the armature conductors depends upon the speed and the number of poles.
SPEED
AND FREQUENCY OF AN ALTERNATOR
The frequency of
induced emf in the armature conductors depends upon the speed and the number of
poles.
Consider a stator
conductor that is successively swept by the N and S‒poles of the rotor. If a
positive voltage is induced when a N‒pole sweeps across the conductor, a
similar negative voltage is induced when a S‒pole sweeps across the conductor.
This means that one complete cycle of emf is induced in the conductor as a pair
of poles passes it. ie., one N‒pole and the adjacent following S‒poles.
Let,
N = rotor speed in rpm
P = number of rotor
poles
f
= frequency in Hz
No. of
cycles/revolution = No. of pairs of poles = P/2
No. of
revolutions/second = N/60
No. of cycles/second =
No. of cycles/revolution × No. of revolutions/second
= (P/2) × (N/60) = NP /
120
The number of cycles
per second is known as frequency.
f
=
NP / 120
Otherwise, synchronous
speed, N= 120f / P
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Tag: Basic Engineering : Synchronous Machines - Speed and Frequency of an Alternator
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
Under Subject
Basic Electronics and Electrical Engineering
EE25C04 1st Semester ECE Dept | 2025 Regulation | 2nd Semester 2025 Regulation
Related Subjects
English Essentials I
EN25C01 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
தமிழர் மரபு - Heritage of Tamils
UC25H01 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Applied Calculus
MA25C01 Maths 1 M1 - 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Applied Physics I
PH25C01 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Applied Chemistry I
CY25C01 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Makerspace
ME25C04 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Computer Programming C
CS25C01 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Computer Programming Python
CS25C02 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Fundamentals of Electrical and Electronics Engineering
EE25C03 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Introduction to Mechanical Engineering
ME25C03 1st Semester | 2025 Regulation | 1st Semester 2025 Regulation
Introduction to Civil Engineering
CE25C01 1st Semester Civil Department | 2025 Regulation | 1st Semester 2025 Regulation
Essentials of Computing
CS25C03 1st Semester - AID CSE IT Department | 2025 Regulation | 1st Semester 2025 Regulation
Applied Physics I Laboratory
PH25C01 1st Semester practical Laboratory Manual | 2025 Regulation | 1st Semester Laboratory 2025 Regulation
Applied Chemistry I Laboratory
CY25C01 1st Semester practical Laboratory Manual | 2025 Regulation | 1st Semester Laboratory 2025 Regulation
Computer Programming C Laboratory
CS25C01 1st Semester practical Laboratory Manual | 2025 Regulation | 1st Semester Laboratory 2025 Regulation
Computer Programming Python Laboratory
CS25C02 1st Semester practical Laboratory Manual | 2025 Regulation | 1st Semester Laboratory 2025 Regulation
Engineering Drawing
ME25C01 EEE Mech Dept | 2025 Regulation | 2nd Semester 2025 Regulation
Basic Electronics and Electrical Engineering
EE25C04 1st Semester ECE Dept | 2025 Regulation | 2nd Semester 2025 Regulation