Induction motor frequency control
Example: A three-phase, 11.2KW,1750rpm,460 V, 60HZ, four-pole Y-connected induction motor has the following parameters: Rs=0,Rr=0.38,Xs=1.14Ω, xr=1.71Ω and xm=33.2Ω. The motor is controlled by varying the supply frequency. If the breakdown torque requirement is 35Nm, Calculate (a) the supply frequency and (b) the speed ωm at the maximum torque.
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. A three – phase, 460V, 60Hz, 4 – pole Y – connected induction motor has the following equivalent circuit parameters: Rs = 0.42Ω, Rr ′ = 0.23Ω, Xs = Xr ′ =0.82Ω, and Xm = 22Ω. The no – load loss Ploss = 60W, assumed as a constant. The rotor speed is 1750
. A three-phase, 460V, 60Hz, 4 – pole Y – connected induction motor has the following equivalent circuit parameters: Rs = 0.42Ω, Rr ′ = 0.23Ω, Xs = Xr ′ =0.82Ω, and Xm = 22Ω. The no load loss Ploss = 60W, assumed as a constant. The rotor speed is 1750 rpm.Use the approximate equivalent circuit ( i.e. the Xm branch is at the very left of the circuit) determine the followinga. the synchronous speedb. the slip sc. the input...
A 3 phase, 460V, 60Hz, 6-pole induction motor has the following equivalent circuit parameters per phase:...
A 3 phase, 460V, 60Hz, 6-pole induction motor has the following equivalent circuit parameters per phase: R1 = 0.2 ohms R2 = 0.28 ohms X1 = X2 = 1.055 ohms Xm = 33.9 ohms The no load losses, comprising friction, windage, and iron losses equal 26W. The motor is coupled to a load and connected to a 460V supply, and the rotor speed is found to be 1156 RPM. For this motor connected to a 460V supply calculate the following:...
A three-phase Delta-connected, 15 hp, 440 VL-L, 60 Hz, six-pole induction motor is running at a...
A three-phase Delta-connected, 15 hp, 440 VL-L, 60 Hz, six-pole induction motor is running at a shaft speed of 1182 rpm. The motor has the following parameters in ohms per phase: Rs = 0.2 Rp = 0.25 Rc = 317 Xs = 1.2 Xr= 1.3 Xm = 42 The rotational loss is 1500 W. Determine: a. Stator current b. Core loss c. Mechanical power d. Maximum developed torque e. Additional rotor resistance to be added to the rotor circuit such...
[3] A three-phase 11.2 kW Y connected induction motor has the following parameters: 460 V, 60...
[3] A three-phase 11.2 kW Y connected induction motor has the following parameters: 460 V, 60 Hz, 4-pole, 1750 rpm. R,-0.382, X1.142, X, - 1.71 2, and X. = 33.2 2. The motor is controlled by stator frequency scalar control method using VSI. Calculate the new values of breakdown torque. if the supply frequency is 65 Hz and 75 Hz respectively. Neglect the stator resistance.
A 3 phase, 440 V, 6 pole, 970 rpm, 50 Hz, Y-connected induction motor has the...
A 3 phase, 440 V, 6 pole, 970 rpm, 50 Hz, Y-connected induction motor has the following parameters referred to the stator Rs = 0.2 Ω, Rr'一0.15 Ω, xs-x-= 0.4 Ω The stator to rotor turns ratio is 3.5 The motor speed is controled by the Static Scherbius Drive. The drive is designed for a speed range of 30% below the synchronous speed. The maximum value of firing angle is 170'. Calculate (i) Turns ratio of the transformer (ii) Torque...
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and...
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and 12 poles. The synchronous speed of a 3-phase, 4-pole induction motor is 60 rev/s. Determine the frequency of the supply to the stator windings. The synchronous speed of a 3-phase induction motor is 25 rev/s and the frequency of the supply to the stator is 50 Hz. Calculate the equivalent number of pairs of poles of the motor. A 6-pole, 3-phase induction motor is...
44. The direction of rotation of an induction motor depends on a. the frequency of the...
44. The direction of rotation of an induction motor depends on a. the frequency of the input voltage b. the strength of the magnetic field set up c. the phase sequence of the input supply lines and order in which they are connected to the stator windings d. whether the windings are connected in delta or star determines the speed of the rotating magnetic field a. the number of poles in the motor b. the frequency of the supply d...
how do we calculate ii and iii) - induction motor (25 marks) QUESTION 3 A three-phase,...
how do we calculate ii and iii) - induction motor
(25 marks) QUESTION 3 A three-phase, 400 V, 50 Hz, 4-pole, 1370 rpm, star connected, squirrei-cage induction motor has the following parameters: R, 20, R2- 3 Q, X1-X2- 3.5 and Xm=40 .Motor is controlled by a voltage source inverter at constant V/f ratio. By using IEEE equivalent circuit; Calculate the starting torque and starting current at 10 Hz To- If the torque-speed to be a straight line calculate the slip...
Problem # 2: Induction Motor Analysis Using The Thevenin Theorem [37 points] A three-phase, two p...
Problem # 2: Induction Motor Analysis Using The Thevenin Theorem [37 points] A three-phase, two pole, 25hp, 460V (line-line), 60Hz, wye-connected, squirrel-cage induction motor has the following per-phase parameters: Ri 0.53 Ohm X2 0.80 Ohm Xi 1.80 Ohms R2 0.30 Ohm Re- 400 Ohms Xm 25.0 Ohms You cannot use any approximate circ uit or any approximation in the calculations. (1) Determine the parameters of the Thevenin equivalent circuit. Draw the equivalent circuit with the appropriate parameter values indicated on...
. A 460-V 460-V, 25-hp, 60-Hz, six-pole, Y-connected induction motor has the following impedanc ohms per...
. A 460-V 460-V, 25-hp, 60-Hz, six-pole, Y-connected induction motor has the following impedanc ohms per phase referred to the stator circuit. Ri= 0.212 R2 = 0.282 X1 = 1.055 12 X2 = 1.055 22 XM = 33.9 W The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped with the rotational losses. For a rotor slip of 4% at the rated voltage and rated frequency, a) The input power b) Peony...
A three-phase Delta-connected, 15 hp, 440 VL-L, 60 Hz, six-pole induction motor is running at a shaft speed of 1182 rpm. The motor has the following parameters in ohms per phase: Rs = 0.2 Rp = 0.25 Rc = 317 Xs = 1.2 Xr= 1.3 Xm = 42 The rotational loss is 1500 W. Determine: a. Stator current b. Core loss c. Mechanical power d. Maximum developed torque e. Additional rotor resistance to be added to the rotor circuit such...
[3] A three-phase 11.2 kW Y connected induction motor has the following parameters: 460 V, 60 Hz, 4-pole, 1750 rpm. R,-0.382, X1.142, X, - 1.71 2, and X. = 33.2 2. The motor is controlled by stator frequency scalar control method using VSI. Calculate the new values of breakdown torque. if the supply frequency is 65 Hz and 75 Hz respectively. Neglect the stator resistance.
A 3 phase, 440 V, 6 pole, 970 rpm, 50 Hz, Y-connected induction motor has the following parameters referred to the stator Rs = 0.2 Ω, Rr'一0.15 Ω, xs-x-= 0.4 Ω The stator to rotor turns ratio is 3.5 The motor speed is controled by the Static Scherbius Drive. The drive is designed for a speed range of 30% below the synchronous speed. The maximum value of firing angle is 170'. Calculate (i) Turns ratio of the transformer (ii) Torque...
1 a Determine the synchronous speed of a motor that has a frequency of 60Hz and 12 poles. The synchronous speed of a 3-phase, 4-pole induction motor is 60 rev/s. Determine the frequency of the supply to the stator windings. The synchronous speed of a 3-phase induction motor is 25 rev/s and the frequency of the supply to the stator is 50 Hz. Calculate the equivalent number of pairs of poles of the motor. A 6-pole, 3-phase induction motor is...
44. The direction of rotation of an induction motor depends on a. the frequency of the input voltage b. the strength of the magnetic field set up c. the phase sequence of the input supply lines and order in which they are connected to the stator windings d. whether the windings are connected in delta or star determines the speed of the rotating magnetic field a. the number of poles in the motor b. the frequency of the supply d...
how do we calculate ii and iii) - induction motor
(25 marks) QUESTION 3 A three-phase, 400 V, 50 Hz, 4-pole, 1370 rpm, star connected, squirrei-cage induction motor has the following parameters: R, 20, R2- 3 Q, X1-X2- 3.5 and Xm=40 .Motor is controlled by a voltage source inverter at constant V/f ratio. By using IEEE equivalent circuit; Calculate the starting torque and starting current at 10 Hz To- If the torque-speed to be a straight line calculate the slip...
Problem # 2: Induction Motor Analysis Using The Thevenin Theorem [37 points] A three-phase, two pole, 25hp, 460V (line-line), 60Hz, wye-connected, squirrel-cage induction motor has the following per-phase parameters: Ri 0.53 Ohm X2 0.80 Ohm Xi 1.80 Ohms R2 0.30 Ohm Re- 400 Ohms Xm 25.0 Ohms You cannot use any approximate circ uit or any approximation in the calculations. (1) Determine the parameters of the Thevenin equivalent circuit. Draw the equivalent circuit with the appropriate parameter values indicated on...
. A 460-V 460-V, 25-hp, 60-Hz, six-pole, Y-connected induction motor has the following impedanc ohms per phase referred to the stator circuit. Ri= 0.212 R2 = 0.282 X1 = 1.055 12 X2 = 1.055 22 XM = 33.9 W The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped with the rotational losses. For a rotor slip of 4% at the rated voltage and rated frequency, a) The input power b) Peony...
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