P1. Determine the number of poles, the slip, and the frequency of the rotor currents at the rated load for three-phase induction motors rated at: (a) 2200 V, 60 Hz, 588 rpm. (b) 120 V, 600 Hz, 873 rpm,
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Induction motor
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- 2. Describe the Torque-Slip characteristics of a three phase induction motor.1.5 A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters Winding Resistance................0.19 Ω ......... Winding Reactance.................1.12 Ω.......... Rotor Parameters Winding Resistance......................0.29 Ω Winding Reactance.....................1.12 Ω Magnetising Reactance................................16.8 Ω Equivalent Core‐loss Resistance....................900 Ω. The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine: 1.5.1 The stator current. 1.5.2 Estimate the Output torque of the motor under the rated conditions. 1.5.3 The Motor…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.
- Q / What is the benefit, purpose and conclusions of making single-phase induction motors ..?1. 2. 4. 4. •.. .... ..... .... E.g. • 2. A 3 phase, 460 V, 10hp, 60 Hz, four-pole induction machine delivers rated output power at a slip of 0.05. determine the a. Synchronous speed and motor speed b. speed of the rotating air gad field c. frequency of the rotor circuit d. Slip in rpm e. Speed of the rotor field relative to the i. rotor structure ii. Stator structure iii Stator rotating field f. haft torque of this motor at the rated load? ... .... Equivalent Circuit • The induction motor consists of a two magnetically connected systems: Stator and rotor • This is similar to a transformer that also has two magnetically connected systems: primary and secondary windings. • The induction motor is similar to the transformer with the excention that its secondarv windings are free to.6- In a stepper motor, how is the speed of rotation determined? a) By the current supplied to the motor. b) By the magnitude of the voltage applied. c) By the load applied to the motor. d) By the frequency of the waveforms used. 7- A transformer core is laminated to a) reduce hysteresis loss b) reduce eddy current losses c) reduce copper losses d) reduce all above losses 8- An induction motor with 580 r.p.m. speed at 60 Hz will have a) 8 poles b) 6 poles c) 4 poles d) 2 poles 9- If any two phases for an induction motor are interchanged a) the motor will run in reverse direction b) the motor will run at reduced speed c) the motor will not run d) the motor will burn 10- No-Load speed of which of the following motor will be highest? a) Shunt motor b) Series motor c) Short-Shunt compound motor d) Long-Shunt compound motor
- 1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be....... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2. When maximum starting torqua ic ohtoinodExample -4. A three-phase. 60-Hz induction motor runs at 890 r/min at no load and at 840 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor's electrical frequency at one-quarter of the rated load?1.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
- 1. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other?2. Derive an expression for the rotor copper loss in terms of slip and input to the rotor?3. What are the various losses in an induction motor? On what factors do they depend?4. List the different types of stray load losses in an induction motor.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.V. List the different types of stray load losses in an induction motor.