A 230v DC series motor takes 30A when giving its rated output at 1400 rpm. It has a field resistance of 0.4 ohms. Calculate the value of the resistance (Ra) of the armature when Eb = 200v.
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- Name three factors that determine the torque produced by an induction motor.What are the advantages and disadvantages of using the following types of motors? shaded-pole motor PSC motor split-phase motor capacitor-start–capacitor-run motorA 4-pole series motor has 800 lap connected armature conductors. At a certain load, the flux per pole is60mWb and the total mechanical torque developed is 400 N-m. Calculate the line current taken by themotor and the speed at which it will run with a back emf of 400 V. Total motor resistance is 4 ohm.
- A universal motor has armature circuit resistance of 15 ohm and inductanceof 0.3H. On being connected to a 220 V dc supply, it draws 1.5 A from themains and runs at 2000 rpm. Find the speed and power factor of the motor,when connected to a 230 V, 25 Hz supply and drawing the same armaturecurrent.A 40Hp, 230V, 10pole, 50Hz three-phase induction motor is running at 585 rpm at rated load. If the stator loss amounts to 1000W and the efficiency of the motor at this load is 90%. Determine the torque lost by friction in lb-ft6- A DC shunt motor is producing EMF of 250V running with 1500rpm. And producing EMF of 240V by adding external resistance same as original shunt field resitance.The original shunt field resistance is 300 ohm.Find the speed at induced emf of 240 V. a. 1000 rpm b. 2880 rpm c. 4320 rpm d. 1600 rpm
- A 220V shunt motor develops a torque of 108 N.m at an armature current of 20 A. The torque developed when the armature current is 40 A isOn full load a 500-volt series motor takes 100-Amp and runs at 840 rpm. The armature resistance of 0.1-ohm, field resistance 0.04-ohm. Find the speed when developing haft full load toque but with a 0.08-ohm diverter resistance parallel with the series field winding. Assume flux proportion to the field current.A 240-V series motor has an armature resistanceof 0.42Ω and a series-field resistance of0.18Ω . If the speed is 500 r/min when the current is36 A, what will be the motor speed when the loadreduces the line current to 21 A? (Assume a 3-Vbrush drop and that the flux is proportional to thecurrent.)
- A 440-V-rms (line-to-line voltage) three-phase induction motor runs at 1150 rpm driving a load requiring 15 Nm of torque. The line current is 3.4 A rms at a power factor of 80 percent lagging. Find the output power, the power loss, and the efficiency.A 20 hp, 440 V, 60 Hz, three-phase star connected synchronous motor has an armature resistance per phase of 0.40 ohm. It is giving its full load output at a power factor of 0.9 leading. If the stray power losses amount to 500 watts, find the armature current.4 DECIMAL PLACES : 2. A 230-V, 50-Hz, 6-pole, single-phase induction motor has the following constants.r1 = 0.12 Ω, r2 = 0.14 Ω, x1 = x2 = 0.25 Ω, xm = 15 Ω.If the core loss is 250 W and the friction and windage losses are 500 W, determine the (a)efficiency and (b) torque at s = 0.05.