A DC motor is wired as shown in the figure. If the ammeter (DC) reads 30 A, determine and report the speed of the motor in RPM. Remember to use linear interpolation on the "curve". The machine has compensation windings. (It does not have an "S" coil).

A DC motor is wired as shown in the figure. If the ammeter (DC) reads 30 A, determine and report the speed of the motor in RPM. Remember to use linear interpolation on the "curve". The machine has compensation windings. (It does not have an "S" coil).

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

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A DC motor is wired as shown in the figure. If the ammeter (DC) reads 30 A, determine and
report the speed of the motor in RPM. Remember to use linear interpolation on the
"curve". The machine has compensation windings. (It does not have an "S" coil).
=20052 Ra=0.252 Vt=150v Vf=150V
Rf
Radj = 100_2
ww
wtest
290 +Ea
270
0
0
1
0.7
MEASURED
AT 1200 RPM
A
раг 0, F2

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