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Consider a three-phase, 2-pole induction machine. Neglect the stator winding resistance and the leakage inductance. The...
A 60-Hx, 2-pole, 208-V wound-rotor induction motor has a threc-phase stator winding of 42 serics turns/phase...
A 60-Hx, 2-pole, 208-V wound-rotor induction motor has a threc-phase stator winding of 42 serics turns/phase and a rotor winding of 38 series turns/phase. When operating at rated terminal voltage, the motor is observed to be operating at a speed of 3517 r/min. Caleulations indicate that under this opcrating condition, the air-gap fHlux wave induces a voltage of 193 V, line-lne in the stator winding. Calculate the corresponding voltage induced in the rotor winding
Problem Solving: 1. A 220V, 4-pole, 60Hz, 1-phase induction motor has an effective rotor resistance and...
Problem Solving: 1. A 220V, 4-pole, 60Hz, 1-phase induction motor has an effective rotor resistance and leakage reactance of 0.5 Ohms and 5 ohms respectively. It is running at a speed of 1,800 rpm. Determine: a. Frequencies of forward and backward rotor current components b. Relative magnitudes of forward and backward fluxes. Neglect magnetizing current and stator impedance. A 220-W, 2-pole, 115-V, 60-Hz single-phase induction motor delivers rated output at a slip 10%. The total copper loss at full load...
Q1 Consider a 24 slot machine. This machine is designed to have 4-poles a) If the...
Q1 Consider a 24 slot machine. This machine is designed to have 4-poles a) If the phase winding 5/6 pitched, draw winding diagram of phase A. b) What is the mechanical angle between the poles of a phase? c) What is the electrical angle between the poles of a phase? d) Calculate the number of coils per phase. e) Each coil has 10 turns. What is the number of turns per phase? f) The phase A current is 5 A....
Problem 1: A four pole, 60Hz, 3-d synchronous generator has a rotor radius of 15 cm, a rotor length of 2.7m, and an air gap length of 2 mm. The rotor field winding consists of 1000 turns with a wi...
Problem 1: A four pole, 60Hz, 3-d synchronous generator has a rotor radius of 15 cm, a rotor length of 2.7m, and an air gap length of 2 mm. The rotor field winding consists of 1000 turns with a winding factor of 0.962. The Δ connected armature winding has 25 series turns per phase with a winding factor of 0.935. The generator is designed to achieve rated open-circuit voltage at a peak air-gap flux density of 1.25 T (a) At...
Consider a 2-pole, 50 Hz, cylindrical rotor ac machine. The air-gap radius is 0.1 m, the...
Consider a 2-pole, 50 Hz, cylindrical rotor ac machine. The air-gap radius is 0.1 m, the air-gap distance is 0.002 m and the air-gap axial length is 0.3 m. The stator winding is excited by a 3-phase, 50 Hz, 5 A (peak), balanced ac current system without rotor excitation. Calculate the air-gap fundamental flux per-pole and the generated fundamental voltage between the terminals of the rotor winding when the rotor is stationary.
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r,...
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r, 0.55 Ω Rotor resistance referred to a stator winding phase: r:-0.51 Ω Stator leakage inductance, L,-4.4 mH Rotor leakage inductance referred to a stator winding phase,1'-4.4 mH Magnetising inductance L-65 mH How many pole pairs has the motor? 12] a. Calculate the nominal power factor of the...
Stator winding stator axis rotor axis ܕ݁ܐܶ RU in L rotor V.RO 0 0.= initial position...
Stator winding stator axis rotor axis ܕ݁ܐܶ RU in L rotor V.RO 0 0.= initial position of the rotor at standstill (rest position) a) Schematic view of SPPMSM b) Electrical equivalent circuit of SPPMSM Description of the motor: In Fig. a, cross-section of a Single Phase Permanent Magnet Synchronous Motor (SPPMSM) is seen. A U shaped stator is wound with a stator winding consisting of two coils connected in series (you can consider a single coil with N turns). A...
3c) Induction Machine Analysis [ 8 marks ] A 415 V, 50 Hz, 1450 rpm, three-phase,...
3c) Induction Machine Analysis [ 8 marks ] A 415 V, 50 Hz, 1450 rpm, three-phase, star-connected induction machine has the following equivalent circuit parameters (referred to the stator winding where appropriate) stator resistance R 0.3 ohms, rotor resistance R2 0.2 ohms stator leakage reactance X 2 ohms, rotor leakage reactance X2' 2 ohms magnetising reactance XM 50 ohms, core loss resistance Rc 200 ohms In your calculations, you should use = the simplified equivalent circuit i) Find the number...
Q3. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following equivalent circuit...
Q3. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following equivalent circuit parameters: Stator parameters: The Main winding (R =1.512, X=2.522), and the auxiliary winding (R=2.512, X=2.52), Rotor parameters referred to the stator side: (R=1N, X=1.592). The magnetizing reactance is equal to 4082. (a)Determine the standstill impedances of both windings. (b)Determine the starting torque and the starting current of the motor if it is started from rated voltage mains as a split phase induction motor. (c)Determine...
A 480 V, 60 Hz, 4-pole-pair, three-phase, delta-connected induction motor has the following parameters: R1=0.42 Ω,...
A 480 V, 60 Hz, 4-pole-pair, three-phase, delta-connected induction motor has the following parameters: R1=0.42 Ω, R2=0.23 Ω, X1=0.48 Ω, X2=0.29 Ω, Xm=29.71 Ω where: R1 is the stator resistance R2 is the rotor resistance reflected in the stator; X1 is the stator leakage inductance; X2 is the rotor leakage inductance reflected in the stator; Xm is the magnetising inductance; The rotational losses are 2450 W. The motor drives a mechanical load at a speed of...
A 60-Hx, 2-pole, 208-V wound-rotor induction motor has a threc-phase stator winding of 42 serics turns/phase and a rotor winding of 38 series turns/phase. When operating at rated terminal voltage, the motor is observed to be operating at a speed of 3517 r/min. Caleulations indicate that under this opcrating condition, the air-gap fHlux wave induces a voltage of 193 V, line-lne in the stator winding. Calculate the corresponding voltage induced in the rotor winding
Problem Solving: 1. A 220V, 4-pole, 60Hz, 1-phase induction motor has an effective rotor resistance and leakage reactance of 0.5 Ohms and 5 ohms respectively. It is running at a speed of 1,800 rpm. Determine: a. Frequencies of forward and backward rotor current components b. Relative magnitudes of forward and backward fluxes. Neglect magnetizing current and stator impedance. A 220-W, 2-pole, 115-V, 60-Hz single-phase induction motor delivers rated output at a slip 10%. The total copper loss at full load...
Problem 1: A four pole, 60Hz, 3-d synchronous generator has a rotor radius of 15 cm, a rotor length of 2.7m, and an air gap length of 2 mm. The rotor field winding consists of 1000 turns with a winding factor of 0.962. The Δ connected armature winding has 25 series turns per phase with a winding factor of 0.935. The generator is designed to achieve rated open-circuit voltage at a peak air-gap flux density of 1.25 T (a) At...
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r, 0.55 Ω Rotor resistance referred to a stator winding phase: r:-0.51 Ω Stator leakage inductance, L,-4.4 mH Rotor leakage inductance referred to a stator winding phase,1'-4.4 mH Magnetising inductance L-65 mH How many pole pairs has the motor? 12] a. Calculate the nominal power factor of the...
Stator winding stator axis rotor axis ܕ݁ܐܶ RU in L rotor V.RO 0 0.= initial position of the rotor at standstill (rest position) a) Schematic view of SPPMSM b) Electrical equivalent circuit of SPPMSM Description of the motor: In Fig. a, cross-section of a Single Phase Permanent Magnet Synchronous Motor (SPPMSM) is seen. A U shaped stator is wound with a stator winding consisting of two coils connected in series (you can consider a single coil with N turns). A...
3c) Induction Machine Analysis [ 8 marks ] A 415 V, 50 Hz, 1450 rpm, three-phase, star-connected induction machine has the following equivalent circuit parameters (referred to the stator winding where appropriate) stator resistance R 0.3 ohms, rotor resistance R2 0.2 ohms stator leakage reactance X 2 ohms, rotor leakage reactance X2' 2 ohms magnetising reactance XM 50 ohms, core loss resistance Rc 200 ohms In your calculations, you should use = the simplified equivalent circuit i) Find the number...
Q3. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following equivalent circuit parameters: Stator parameters: The Main winding (R =1.512, X=2.522), and the auxiliary winding (R=2.512, X=2.52), Rotor parameters referred to the stator side: (R=1N, X=1.592). The magnetizing reactance is equal to 4082. (a)Determine the standstill impedances of both windings. (b)Determine the starting torque and the starting current of the motor if it is started from rated voltage mains as a split phase induction motor. (c)Determine...
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