A 440 V, 50 Hz 9740 rpm 6 Pole star connected, 3 phase wound rotor induction motor has the following parameters referred to as the stator. Rs=0.1-ohm, Rr’= 0.08 ohms, Xs=0.3 ohm, Xr’= 0.4 ohms. The stator to rotor turns ratio is 2. Motor speed is controlled by a static Kramer drive. Drive is designed for a speed range of 25% below the synchronous speed. Maximum value of firing angle is 165 degrees. Calculate A.) Transformer turn ratio. B.) Torque for speed of 780 rpm and alpha=140 degrees. C.) Firing angle for half the rated motor torque and speed of 800 rpm.
A 440 V, 50 Hz 9740 rpm 6 Pole star connected, 3 phase wound rotor induction motor has the following parameters referred to as the stator. Rs=0.1-ohm, Rr’= 0.08 ohms, Xs=0.3 ohm, Xr’= 0.4 ohms. The stator to rotor turns ratio is 2. Motor speed is controlled by a static Kramer drive. Drive is designed for a speed range of 25% below the synchronous speed. Maximum value of firing angle is 165 degrees. Calculate A.) Transformer turn ratio. B.) Torque for speed of 780 rpm and alpha=140 degrees. C.) Firing angle for half the rated motor torque and speed of 800 rpm.
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A 440 V, 50 Hz 9740 rpm 6 Pole star connected, 3 phase wound rotor induction motor has the
following parameters referred to as the stator. Rs=0.1-ohm, Rr’= 0.08 ohms, Xs=0.3 ohm, Xr’=
0.4 ohms. The stator to rotor turns ratio is 2. Motor speed is controlled by a static Kramer drive.
Drive is designed for a speed range of 25% below the synchronous speed. Maximum value of
firing angle is 165 degrees. Calculate
A.) Transformer turn ratio.
B.) Torque for speed of 780 rpm and alpha=140 degrees.
C.) Firing angle for half the rated motor torque and speed of 800 rpm.
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