Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Rotor Output of Induction Motor
Induction Motor: Rotor Output
ROTOR
OUTPUT
Let, Tg be
the gross‒torque developed by the motor in N‒m and N, the speed of the rotor in
rpm.
Gross rotor output = 2πΝΤg
/ 60 watts ……..(5.22)
If there were no copper
losses in the rotor, the output would equal rotor input and the motor would run
at synchronous speed, NS.
Rotor input = 2πNSTg
/ 60 Watts …………(5.23)
Rotor input = Rotor
output + Rotor Cu loss
Rotor Cu loss = Rotor
input ‒ Rotor output
Rotor Cu loss = 2πTg/60
(NS‒N) …………(5.24)
Eqn (5.24) divided by
eqn (5.23),
Rotor Cu loss / Rotor
input = (Ns‒N)/NS = s
Rotor Cu
loss = s × Rotor input ...
(5.25)
Gross rotor output, Pm
= Rotor input ‒ Rotor Cu loss
= Rotor input ‒ (s ×
Rotor input) …………(5.26)
Pm = Rotor
input × (1 − s)
Eqn (5.26) divided by
Eqn (5.23),
Gross rotor output / Rotor
input = 1‒s = N / NS
Eqn (5.24) divided by
Eqn (5.26)
Rotor Cu loss / Gross
rotor output = s / 1‒s …….. (5.28)
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : - Rotor Output of Induction Motor
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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Basic Electronics and Electrical Engineering
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