Why is the power factor of an induction motor calculated at full load/blocked rotor test?
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- 8. Homework: I. What is the effect of load on the efficiency of an induction motor? I. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? III. Derive an expression for the rotor copper loss in terms of slip and input to the rotor? What are the various losses in an induction motor? On what IV. factors do they depend? V. List the different types of stray load losses in an induction motor.tørque in new Draw the power flow diagram of induction motor and explain the different power losses, the air gap power and the converted pòwer. Explain how by solving the equivalent circuit of three phase induction motor the input current, input power factor, air gap power, rotor copper loss, converted power, output power and induced torque are calculated. (b)A 440 V, 50 Hz, 2-pole, Y-connected induction motor is rated 75 KW. The equivalent circuit parameters are: R, = 0.0752 R, = 0.0652 X = 1.22 Pare = 1.1kW X, = 0.172 X, = 0.17Q Pe =150W PEAW = 1.0kW For a slip of 0.04 find the line-eurrent, the stator"power factor, the stator copper_loss, the air gap power, the converted power the induced torque and the Toad torque. MISCWhat is the relationship between slip s) and load (Pa) in an induction motor? Please explain.
- What are the various losses in an induction motor? On what factors do they depend? IV. V. List the different types of stray load losses in an induction motor.a) Why the slip of induction motor is never zero, b) What happens if the slip of induction motor is one, c)What is the value of the slip for an induction motor at no load and full load.I.What is the effect of load on the efficiency of an induction motor? II. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? III. Derive an expression for the rotor copper loss in terms of slip and input to the rotor? IV. What are the various losses in an induction motor? On what factors do they depend? V. List the different types of stray load losses in an induction motor.
- An 3-phase induction motor(IM) has full load slip = 0.5%. If the rotor circuit resistance is increased so that R2new =2R2old, then the slip at which the motor develops the same full load torque is=.. * ......I. What is the effect of load on the efficiency of an induction motor? I. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? II. Derive an expression for the rotor copper loss in terms of slip and input to the rotor? What are the various losses in an induction motor? On what IV. factors do they depend? V. List the different types of stray load losses in an induction motor.(a) With aid of suitable diagram, explain the losses and power-flow of an induction motor. (b) A three-phase, 60 Hz, six poles induction motor runs at a no-load speed of 1150 r/min and full-load speed is 1000 r/min. (i) Calculate the slip of the rotor at no-load and full-load conditions.
- An 8 pole, 50 Hz slip ring induction motor runs at a slip of 2.67% on full load. The rotor resistance per phase of the winding is 0.2 ohm. What external resistance per phase must be added in the rotor circuit so that the motor now runs ate a slip of 17.33% such that the torque remains same in both the cases. (Ans: 1.1 ohm)Here it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand well1.why the slip of induction motor is never zero, 2.what happens if the slip of induction motor is one, 3.what is the value of the slip for an induction motor at on load and full load