With an AC source of 230 V, 50 Hz, a single phase half controlled bridge rectifier is used to fed a 120 A, 220 V, 850 rpm seperately excited DC motor with an armature resistance of 0.06 2 and assuming condition, determine the firing angle of rectifier for rated torque and 760 continuous rpm. 662.77° 24.87° 32.25°
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- (i) With necessary sketch, write the load current flow path of a single phase semi converter during freewheeling period. Assume the load have resistance and high inductance value and the semi converter requires multiple gate pulse for triggering. (i) Draw the circuit diagram of the single phase half wave controlled rectifier (RL load) with center-tapped transformer and compare its performance with uncontrolled rectifier operation.Suppose a shunt regulator voltage is 250V, the armature current is 30A. field coils are required to provide an MMF of 500AT. The field might typically say 200turns with resistance of 0.5Ohms/turn. Find the dissipated power as heat and total input required and the efficiencySuppose a series regulator voltage is 250V, the armature current is 30A. field coils are required to provide an MMF of 500AT. Since field coils has to carry a larger current , the cross sectional area of the wire is also increased thus the total resistance by ratio and proportion is now 0.69444444 Ohms. Find the dissipated power as heat and total input required and the efficiency
- A 4-quadrant DC chopper with bipolar switching operating at a switching frequency of 2kHz, is connected to a 120VDC source (Vs) and a DC motor which has a counter EMF (CEMF) of 50VDC at rated speed. The armature resistance is 2Ω and the armature inductance is 20mH. Calculate: a) Output voltage with an 80% duty cycle b) Magnitude and direction of the DC armature current with an 80% duty cycle. c) Duty cycle for a forward braking current of 10ADC. (Assume the speed has not changed due to the large inertia of the load.)The positioning block diagram of the welding tip is given in the following figure. Of the systemFind the value of "a" in terms of K for stable operation. (Use the Routh Hurwitz stability criterion.)Topic: Efficiency and Testing of DC machines See the image sttached.
- In the experiment of dc motor drive using three phase half wave rectifier, when the torque load increased, the armature current *Suppose line voltage may be as low as 105 Vrms or as high as 125 Vrms in a half-wave rectifier. With a 5;1 step-down transformer, the minimum peak load voltage is closest to___A separately, excited Dc motor fed from3-phase semi-controlled rectifier develops a fullload torque at 1500 rpm. When firing angle Zerothe armature taking 50A and havinghaving an armatureresistance of 0.5ohm. when the motor back emfConstant is 0.25 V/rpm. Calculate the supplyVoltage per phase, find also the range ofangle required to give speed between 1500rpmand 750 rpm at full load torque.
- Draw the circuit of a single-phase-to-single-phase cycloconverter that is based on the use of two bi-phase half-wave rectifiers. The input voltage of such a cycloconverter is 220 V, 100 Hz. Draw the waveforms of all thyristor currents and source current of cycloconverter for a resistive load of 10 Ω and for output frequency.Single phase half wave AC-AC converter has a resistance of R = 50 ohms. Input voltage is given as 230 Vrms. Transformer conversion ratio is 1:1. If T1 thyristor is triggered at 60 degrees; a)Rms output voltage? b)Output power? c)RMS load current and average load current? d)Input power factor? e)Average and RMS thyristor current?A separately excited motor runs at 1045rpm, with a constant field current, while taking an armature current of 50A at 120V. The armature resistance is 0.1 Ω if the load on the motor changes such that it now takes 95A at 120V, determine the motor speed at this load.