Plot the air gap mmf-as & mmf-bs. as2(' bsa asi bs as bs2 bsj bS4 asj...
A four-pole synchronous AC generator with a smooth air gap has a distributed rotor winding with 260 series turns, a winding factor of 0.935, and an air gap of length 0.7 mm. Assuming the mmf drop in the electrical steel to be negligible, find the rotor-winding current required to produce a peak, space-fundamental magnetic flux density of 1.8 T in the machine air gap.
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.
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....
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed. The stator has 5 slots per pole per phase and each slot contains 4 conductors arranged in two layers. The coil pitch is 12 slots. With normal excitation and rated speed, the voltage induced per conductor is 25 volts. What is the open-circuit emf between the terminals when this machine is wye-connected and all the conductors per phase are connected in series?
A 3-phase, 60 Hz, 6 pole alternator has an air gap flux that is sinusoidally distributed. The stator has 5 slots per pole per phase and each slot contains 4 conductors arranged in two layers. The coil pitch is 12 slots. With normal excitation and rated speed, the voltage induced per conductor is 25 volts. What is the open-circuit emf between the terminals when this machine is wye-connected and all the conductors per phase are connected in series?
Problem 1. A magnetic flux of 2 mWb is to be produced in the air gap of the magnetic circuit shown in Figure 1. How much magnetomotive force (mmf) the winding must provide to achieve this? Relative permeability r of the core material may be assumed to be constant and equal to 5,000. All the dimensions shown are in centimeters [cm] and the cross sectional area is 25 [cm2] through out 15 15 0.1 20 Figure 1: Magnetic circuit for...
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...
A thin air gap between two refractive materials with n =1.3 and n2-1.8 is shown in the diagram. The gap is the thinnest possible so that totally destructive interference occurs between ray 1 and ray 2, for light of a particular wavelength I. What is the effective phase difference A931 = 03 - 01 between ray 3 and ray 1? 1 1 1 n=1.3 Air n=1.8 Oo O 0.31 I/2 Оп Impossible to calculate without knowing
An air-filled, parallel-plate capacitor with area A and gap width d is connected to a battery that maintains the plates at potential difference V. 1. The plates are pulled apart so that the gap is 2 times wider, while they remain in electrical contact with the battery terminals. By what factor Uelectric,f/Uelectric,iUelectric,f/Uelectric,i does the potential energy of the capacitor change? (Express your answer to two significant figures.) 2. By what factor Uelectric,f/Uelectric,iUelectric,f/Uelectric,i does the potential energy of the capacitor change...
- 8 cm 8 cm 0.5 cm N=500 Consider the magnetic core with an air gap as shown in Figure Q3. The core material has a relative permeability of 6000 and a rectangular cross section 2cm x 3cm. The coil has 500 turns. Given that permeability of free space is Ho = 41 x 10-7. a) Lukiskan litar magnet yang berkenaan. Draw the equivalent magnetic circuit. (2 markah/marks) b) Tentukan keratan rentas (Acore) dan engganan (Rcore) untuk teras. Determine the...