A variable speed DC motor drives a load that requires a constant torque of 400Nm with thepower varies from 5hp to 15hp. The motor is connected to a 300V DC supply. The armatureresistance is 0.12 and the armature current remains constant at 40A. The speed of the motoris varied via armature resistance control. [note: 1hp (hoursepower) = 746W].Determine the rheostat range that is required for this design.

Answered: Image /qna-images/answer/7e911970-ded1-4550-8bd3-6b23a290ee03.jpg

Answered: A variable speed DC motor drives a load…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

See similar textbooks

Similar questions

A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature resistance is 0.3 2 and the series field resistance is 0.1 2. Determine the resistance to be connected in series to reduce the speed to 500 rev/min with the same current
A series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.
A series motor runs at 800 r/min when the voltage is 400 V and the current is 25 A. The armature resistance is 0.4 ohm and the Series field resistance is 0.2 ohm. Determine the following: (a) The constant of the motor. If the speed decreases to 600 r/min,the torque increases by 32% and the field increases by 10%, determine the following: (b) The new armature current. (c) The new field current. (d) The new total resistance of the motor in ohm. (e) The additional resistance inserted in series with the motor in ohm.
No chat GPT HAND WRITTEN ONLY OTHERWISE WILL LEAVE A DOWNVOTE
The current drawn by a 120 V d.c. motor with back e.m.f. of 110 V and armature resistance of 0.4 ohm is A
A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor draws 6 A at 1600 rpm at no load. Calculate the speed and shaft torque if the motor draws 52 A at rated voltage.
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.
A small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor draws 4.0 A, and when the armature is clamped so that it cannot turn, the motor draws 24 A. What is the back emf when the motor is operating normally?
Colve asap
A 300 V Series motor draws a current of 50 A. The field resistance is 40 m ohm and the armature resistance is 0.2 ohm. Determine the maximum efficiency of the motor.
?In DC machine torque depends on which of the following None of the above O armature current (la) O flux (4) flux (p) and armature current (la)
hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?

SEE MORE QUESTIONS

Recommended textbooks for you

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS