Answered: if the motor runs at 750 rpm, what is…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter25: The Motor And Starting Methods

Section: Chapter Questions

Problem 5SQ: When the voltage is reduced to start a motor, what happens to the a. torque? b. current?

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if the motor runs at 750 rpm, what is the torque provided by the motor?

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A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.
hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?
2. Give two ways you can reverse the direction of a basic dc motor? O a) Reverse the current O b) Keep the current the same O c) Reverse the magnetic field O d) Keep the magnetic field the same
The reason I did ask for help it is becuase is hard and complex
A motor is operating a load that requires a torque of 750 lb-in. and is turning at a speed of 1575 RPM. How much hp is the motor producing?
How would the shaft speed of the motor change if a negative torque is applied while motor is spinning in negative direction? Don't copy paste
EA5 kW, 20O V dc shunt motor has armature resistance of 1 ohm and shunt field resistance of 100 ohm. At no load, the motor draws 6 A from 200 V supply and runs at 1000 rpm. What is the total copper loss of the machine? (a) 400 W (c) 36 W (b) 16 W (d) 416 W
In a motor, increasing the gap between electromagnets and a rotor: Select one: decreases motor torque. increases motor torque. increases motor speed. reverses the direction the rotor turns.
A series motor develops 164 lb-ft torque when the current is 94A. If the load increases the current 50% with the flux increase of 20%, what is the torque at the second value of current?
Tell us why the alterantor develop the counter torque when the load is connected to the armature.
A dc motor takes an armature current of 105 Amps at 480 V when running at 720 rpm. The resistance of the armature circuit is 0.2 ohm and the field resistance is 96 ohms. What is the torque developed in the armature?

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