Homework Answers
A) squirrel cage rotor type induction machine
>Rotor is caged on both sides
B) slip ring or wound type induction motor
> Slip rings are provided to rotor
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of each AC induction machine based on Figures 1 and 2 in terms of its rotor...
Consider a 50 kW, 3-phase, 380 V line-to-line, 50 Hz, 6 pole Y-connected wound-rotor induction motor....
Consider a 50 kW, 3-phase, 380 V line-to-line, 50 Hz, 6 pole Y-connected wound-rotor induction motor. The stator winding ac resistance is 0.1 Ω/phase. The effective stator-to-rotor turns ratio is 2. The exciting branch is negligible. It is found that when an external resistor of 0.09 Ω/phase is connected to the rotor terminals maximum starting torque of 1150 Nm is obtained. a. Compute the internal mechanical power and the internal torque developed by this motor when it drives a load...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. [5 MARKS] The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. b) Table 2 No-load test Locked rotor test DC test VNL = 450 V...
I want to solve this problem step by step. Thanks (35 points) Induction Generator Real Power Generation. A three phase, 220V line to line, six pole, 60Hz, wye connected induction machine op...
I want to solve this problem step by step. Thanks
(35 points) Induction Generator Real Power Generation. A three phase, 220V line to line, six pole, 60Hz, wye connected induction machine operates at rated voltage as a generator at a slip of-0.04. Its equivalent circuit parameters are the same as those in problem #1. The input mechanical power at the rotor (this is a generatorl) is 5.2kW. The core losses are 200Watts; friction and windage losses are 17 Watts; treat...
Problem 1 (25 points) The parameters of a 6-pole, 2-phase, permanent-magnet ac machine are: 10mH =...
Problem 1 (25 points) The parameters of a 6-pole, 2-phase, permanent-magnet ac machine are: 10mH = 2Ω,4,-1 mH, Lm,- Calculate the angular rotor velocity wrm and the electrical angular velocity wr. (4 points) [Update: use part (i) for the operating condition.] (i) s given that the open-circuit phase voltage is sinusoidal with a peak-to-peak value of 40 V, when the device is driven at 1200 r/min. Calculate λ,n, (8 points) Alternatively-when the stator windings of the permanent-magnet ac machine are...
1. (25 point) What is the principal difference between a synchronous machine and an induction machine?...
1. (25 point) What is the principal difference between a synchronous machine and an induction machine? 2. (25 point) What is the equation for the induced torque in an ac machine? 3. (50 point) The simple loop is rotating in a uniform magnetic field shown in Figure 3-3 has the following characteristics: B = 1.0 T to the right r= 0.1m 1 = 0.3m Wm = 377rad/s (1) Calculate the voltage etot (t) induced in this rotating loop. (2) What...
Show all steps Chapter 4, Problem 28P (1 Bookmark) ON Figure 4.41 shows in cross section a machine having a rotor winding f and two identical stator windings a and b whose axes are in quadrature. The...
Show all steps Chapter 4, Problem 28P (1 Bookmark) ON Figure 4.41 shows in cross section a machine having a rotor winding f and two identical stator windings a and b whose axes are in quadrature. The self-inductance of each stator winding is Laa and of the rotor is Lff. The air gap is uniform. The mutual inductance between a stator winding depends on the angular position of the rotor and may be assumed to be of the form where...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
Alternating current (AC) machines are generators that convert mechanical energy to AC electrical energy and motors that...
Alternating current (AC) machines are generators that convert mechanical energy to AC electrical energy and motors that convert AC electrical energy to mechanical energy. The AC machine are categorized as synchronous machine and induction machine. (Mesin-mesin arus wlang-alik (AU) adalah penjana-penjana yang memukarkan tenaga mekanikal kepada tenaga elektrik AU dan motor-motor xang memukarkanm tenaga elektrik AU kepada tenaga mekanikal Mesin AU dikategorikan kepada mesin segerak dan mesin aruhan (ii) rotor frequency,f frekuensi pemtar,1 (1 Mark/ Markah) (iii) stator copper losses,...
15. Calculate the actual rotor speed, in rad/s, at maximum steady-state torque for the machine gi...
Example 6C:
15. Calculate the actual rotor speed, in rad/s, at maximum steady-state torque for the machine given in Example 6C for operation as a motor when connected to an electric source of (a) 120 Hz with twice rated voltage, (b) 60 Hz with rated voltage, (c) 30 Hz with one-half rated voltage, and (d) 6 Hz with 10 percent rated voltage. Example 6C. The parameters for the equivalent circuit shown in Fig. 6.8-1 may be calculated by using electromagnetie...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. [5 MARKS] The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. b) Table 2 No-load test Locked rotor test DC test VNL = 450 V...
I want to solve this problem step by step. Thanks
(35 points) Induction Generator Real Power Generation. A three phase, 220V line to line, six pole, 60Hz, wye connected induction machine operates at rated voltage as a generator at a slip of-0.04. Its equivalent circuit parameters are the same as those in problem #1. The input mechanical power at the rotor (this is a generatorl) is 5.2kW. The core losses are 200Watts; friction and windage losses are 17 Watts; treat...
Problem 1 (25 points) The parameters of a 6-pole, 2-phase, permanent-magnet ac machine are: 10mH = 2Ω,4,-1 mH, Lm,- Calculate the angular rotor velocity wrm and the electrical angular velocity wr. (4 points) [Update: use part (i) for the operating condition.] (i) s given that the open-circuit phase voltage is sinusoidal with a peak-to-peak value of 40 V, when the device is driven at 1200 r/min. Calculate λ,n, (8 points) Alternatively-when the stator windings of the permanent-magnet ac machine are...
1. (25 point) What is the principal difference between a synchronous machine and an induction machine? 2. (25 point) What is the equation for the induced torque in an ac machine? 3. (50 point) The simple loop is rotating in a uniform magnetic field shown in Figure 3-3 has the following characteristics: B = 1.0 T to the right r= 0.1m 1 = 0.3m Wm = 377rad/s (1) Calculate the voltage etot (t) induced in this rotating loop. (2) What...
Show all steps Chapter 4, Problem 28P (1 Bookmark) ON Figure 4.41 shows in cross section a machine having a rotor winding f and two identical stator windings a and b whose axes are in quadrature. The self-inductance of each stator winding is Laa and of the rotor is Lff. The air gap is uniform. The mutual inductance between a stator winding depends on the angular position of the rotor and may be assumed to be of the form where...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
Alternating current (AC) machines are generators that convert mechanical energy to AC electrical energy and motors that convert AC electrical energy to mechanical energy. The AC machine are categorized as synchronous machine and induction machine. (Mesin-mesin arus wlang-alik (AU) adalah penjana-penjana yang memukarkan tenaga mekanikal kepada tenaga elektrik AU dan motor-motor xang memukarkanm tenaga elektrik AU kepada tenaga mekanikal Mesin AU dikategorikan kepada mesin segerak dan mesin aruhan (ii) rotor frequency,f frekuensi pemtar,1 (1 Mark/ Markah) (iii) stator copper losses,...
Example 6C:
15. Calculate the actual rotor speed, in rad/s, at maximum steady-state torque for the machine given in Example 6C for operation as a motor when connected to an electric source of (a) 120 Hz with twice rated voltage, (b) 60 Hz with rated voltage, (c) 30 Hz with one-half rated voltage, and (d) 6 Hz with 10 percent rated voltage. Example 6C. The parameters for the equivalent circuit shown in Fig. 6.8-1 may be calculated by using electromagnetie...
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