1-transfer function of DC shunt motors (step by step
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- A three-phase 60 Hz induction motor connected to a three-phase bus at rated voltage isoperating at a low slip condition (i.e s < 20%) resulting in a steady state speed of 1090 rpm.(a) How many poles does the motor have?(b) What is the percentage slip at the operating speed?(c) What is the corresponding frequency, (fr) of the currents and voltages induced in therotor winding?A separately excited generator has no-load voltage of 125V. A certain load rated at 1200W, 120V is then connected at the terminal. Calculate the series resistance needed to connect to the armature circuit in order for the load to operate at rated condition if the armature resistance is 0.0692Ω.(a) A short shunt cumulative compound dc generator supplies 6kW at 235V. The Shunt field resistance, Series field resistance and Armature resistances are 8012, 0.192 and 0.22 respectively. Calculate the induced emf and load resistance.
- A long shunt cumulative compound dc generator delivers a load current of 60A at 440V. The shunt field resistance , series field resistance and armature resistance are 80, 0.9 and 0.4 respectively. Calculate the induced emf and load resistance.There are three commonly used excitation modes for stepper motors: full step, half step and microstepping.Illustrate micro-stepping with the help of a neat diagram by modulating phase supplyvoltage for a generic stepper motor with 4 and 6 poles respectively in its stator and rotor.Design and develop equivalent circuit model of a single phase Induction motor with th consideration of core losses present with the parameter consideration of stator resistance R1 and reactance X1 and two rotor parameters which includes r2,x2 and magnetising reactance xm. (Illustration is required) Draw by hand please
- Kindly solve the problem with step by step complete solution. Also, show the given and formula used. Thanks! Find the synchronous impedance and reactance in alternator in which a given field current produces an armature current of 250A on short-circuit and the generated emf of 1500V on open circuit. The armature resistance is 2 ohms.The air-gap flux density of a two-pole induction motor is given by B=Bm cos(ωt−θ)where Bm is the peak flux density, θ is the angular displacement around the air gap, and we have assumed clockwise rotation. Give the corresponding expression for the flux density of a four-pole induction motor; of a six-pole induction motor.A DC shunt generator has a full load output of 10kW at a terminal voltage of 240V. The armature and the shunt field winding resistances are 0.6 and 160 ohms respectively. The sum of the mechanical and core-losses is 500W. calculate the power required in kW at the driving shaft at full-load, and the corresponding efficiency and voltage regulation
- 3. What are the applications of DC Motors in present day context?Discuss the operation of capacitor-start-and-run motors with adiagram.Two similar 6,600-V, three phase generators are running in parallel on constant-voltage andfrequency bus bars. Each has an equivalent resistance and reactance of 0.05 Ω and0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a laggingp.f. of 0.8, the two machines being similarly excited. If the excitation of onemachine be adjusted until the armature current is 438 A and the steam supply to theturbine remains unchanged, find the armature current, the e.m.f. and the p.f. of theother alternator.