efficiency of the motor.
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A Series motor a current of 25 A when the supply voltage is 230V. If the total resistance of the motor is 3 0 and the Iron, Friction, Windage losses are 250 W. Find the efficiency of the motor.
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- A 200V d.c. motor develops a shaft torque of 15 Nm at 1200 rev/min. If the efficiency is 80%, determine the current supplied to the motor.A dc series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2ohms and the iron, friction and windage losses amount to 300W, determine the efficiency of the motor.A dc series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2Ω and the iron, friction and windage losses amount to 300W , determine the efficiency of the motor ANSWER:_______________%
- Find all types of power losses (the second photo shows the types of power losses) The weight of the car is 800 Kg The weight of each person is 75 Kg You may assume any missing parameters you need in the design appropriately (e.g., the rolling-resistance-power, air-resistance-power, the DC motor's parameters, ....etc)A 600 V series motor takes 120 A and operates at 900 rpm when the load is80 HP. If the effective circuit resistance is 0.20 ohm, calculate the HPoutput of the motor when the current drops to 90 A. assuming that the fluxis reduced by 20 %.We are given a motor which has a rated efficiency of 91.7% The current is 25/12.5 A and power factor is 82%, full-load speed is 1765 rpm, the voltage is 230/460 V (1) Check the efficiency is correct with the given data. (2) How much will it cost to run the motor at full load for 16 hours per day, five days a week, and 50 weeks a year. Assuming the plant has a contracted rate of 12 cents per kwh.
- A d.c. series motor drives a load at 30 rev/s and takes a current of 10 A when the supply voltage is 400V. If the total resistance of the motor is 2 ohm and the iron, friction and windage losses amount to 300W, determine the efficiency of the motor.A motor operating on a 120 volt DC supply drivesw a direct current generator, which is delivering 1 kilowatt at 240 volts. Under these conditions the motor has 78% efficiency and the generator has 85% efficiency. Determine: a. The output of the motor in horsepower and, b. The line current drawn by the motor.A dc series motor rated at 460V and runs at a speed of 500 rpm draws a current of 40A. The equivalent resistance of the motor is 0.8ohm. If the load is reduced to 30A,determine the speed of the motor
- 1. The armature windings of a dc motor have a resistance of 5.0 Ω. The motor is connected to a 120 V line and when the motor reaches full speed against its normal load, the counter emf is 108 V. Calculate: a. The current into the motor when it is just starting up. Be sure to draw the equivalent circuit showing your motor as a resistor, the battery, and the back emf (another battery) if it exists b. The current when the motor reaches full speed. Be sure to draw the equivalent circuit showing your motor as a resistor, the battery, and the back emf (another battery) if it exists.A motor is being self-started against a resisting torque of 60 N-m and at each start, the engine is cranked at 75 r.p.m. for 8 seconds. For each start, energy is drawn from a lead acid battery. If the battery has the capacity of 100 Wh, calculate the number of starts that can be made with such a battery. Assume an overall efficiency of the motor and gears as 25%.A 600 V series motor takes 120 A and operates at 900 rpm when the load is80 HP. If the effective circuit resistance is 0.20 ohm, calculate the HPoutput of the motor when the current drops to 90 A. assuming that the fluxis reduced by 20 %. [Ans. 49.86 HP]