A 3-phase induction motor the equivalent rotor stand still
A 3-phase induction motor, the equivalent rotor stand still reactance is equal to the reactance, while each resistance is (1/3)rd of this value. A torque of 500 Nmis developed at a slip of 5%. Calculate the maximum torque and thestarting torque.
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The ratio of stator to rotor turn is 1.8. The full load slip is 2%. Calculate for this load the torque developed torque and the horse power . Find also the maximum torque and the speed at maximum torque . Neglect stator impedance.
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Olympic cyclists fill their tires with helium to make them lighter. A cyclist filled her bicycle tire, which has a volume of 855 mL, to a pressure of 8.5 atm at 25 C with helium.
A 12 KW, 50 Hz 3-phase induction motor developes rated torque at 1450 r.p.m. in case load torque is reduced to half , find the motor speed and the power output. Assume linear torque -slip characterstiics near the operating range.
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A 3-phase squirrel cage motor has maximum torque equal to twicefull load torque. r2 =0.3 ohms and x2 =3ohms. Determine the ratio of starting torque to full loadtorque, if it is started by (a) Direct on line starter(b) star delta starter
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