Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Rotor Current in Three Phase Induction Motor
The rotor is assumed to be star connected wound type.
ROTOR
CURRENT
Fig. 5.12 shows the
circuit of 3‒phase induction motor at any slip 's'. The rotor is assumed to be
star connected wound type. Assume that rotor emf/phase and rotor
reactance/phase are sE2 and sX2 respectively. The rotor
resistance/phase is R2. It is independent of frequency and
therefore, does not depend upon slip.
Similarly in stator
side, the stator winding resistance and inductance are R1 and X1.
Now we will consider
only one phase as the conditions in the other two phases, are similar.
At standstill
Fig. (5.13) shows one
phase of rotor circuit at standstill condition.
Rotor current/phase,
I2 = E2 / Z2 =
E2 / √(R22 + X22)
Rotor power factor
cos ϕ2 = R2
/ Z2 = R2 / √(R22 + X22)
When running at slip
's'
Rotor current/phase,
I2 = sE2
/ Z'2
I2 = sE2
/ √(R22 + (sX2)2)
Rotor power‒factor, cos
ϕ2 = R2 / Z2'
cos ϕ2 = R2
/ √(R22 + (sX2)2)
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : - Rotor Current in Three Phase Induction Motor
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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