Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Starting Torque in Three Phase Induction Motor
1. Starting Torque of a Squirrel‒Cage Motor 2. Starting Torque of a Slip ring motor
STARTING
TORQUE
Let
R2 = Rotor resistance per phase
X2 = Rotor reactance per phases
Z2 = Rotor impedance per phases
Z2 = √[ R22
+ x22 ]
E2 = Rotor
emf per phase at standstill
Rotor current/phase, I2
= E2/Z2
Starting torque Tst
= KE2I2 cos ϕ2
It supply voltage V is constant, Then the flux ϕ and hence E2 both are constant.
Where,
K2 is some
other constant.
1. Starting Torque of a Squirrel‒Cage Motor
Squirrel cage motors
have starting torque of 1.5 to 2 times the full‒load value with starting
current of 5 to 7 times the full‒load current. Since the rotor bars are
permanently short circuited, it is not possible to add any external resistance in
the rotor circuit at starting period. Hence such motors are not useful where
the motor has to start against heavy loads.
2. Starting Torque of a Slip ring motor
The resistance of the
rotor circuit of such motors can be varied through the addition of external
resistance. By adding the proper value of external resistance (R2 =
X2) maximum starting torque can be obtained. As the motor
accelerates, the external resistance is gradually cut out until the rotor
circuit is short‒circuited on itself for running conditions.
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : - Starting Torque in Three Phase Induction Motor
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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