Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 30, Problem 8RQ
To determine
The parameter that limits the amount of current flow through the armature when power is first applied to the motor.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Explain how does the current will be reduced during the starting of the motor.
This term refers to the number of times a wire revolves around the armature
core.
turn
revolution
This is the rotating part of the gener
or motor.
rotor
stator
Which of these is NOT a part of a DC generator?
stator
slip rings
commutator
brushes
2- A simple wave wound de shunt motor has the following data:
Armature resistance =0.1 ohm
Shunt field resistance = 100 ohm
Number of poles = 2
Number of conductors = 400
Mechanical and core loss at full load = 2000 W.
When the motor is connected to a 400 Volt supply and is fully loaded
it draws 104 A. Calculate at a speed of 3000 rpm:
i) Armature current and E.M.F
ii) Flux per pole
iii) Copper losses within the machine.
iv) Developed torque, shaft torque and efficiency.
v) Sketch the power flow diagram at full load.
vi) Motor speed if an external resistance of 0.4 ohms is added to the armature circuit
while the load torque remains constant.
Chapter 30 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 30 - Prob. 1RQCh. 30 - Prob. 2RQCh. 30 - Prob. 3RQCh. 30 - Prob. 4RQCh. 30 - What type of motor is known as a constant-speed...Ch. 30 - What is CEMF?Ch. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - Prob. 9RQCh. 30 - What type of motor should never be operated at no...
Ch. 30 - Prob. 11RQCh. 30 - What is the most common way of changing the...Ch. 30 - Prob. 13RQCh. 30 - Prob. 14RQCh. 30 - What device is used to disconnect power to the...Ch. 30 - Prob. 16RQCh. 30 - Who was the first person to establish a...Ch. 30 - One horsepower is equal to how many W?Ch. 30 - A motor is operating a load that requires a torque...Ch. 30 - The motor in Question 19 is connected to a 250-VDC...Ch. 30 - Prob. 1PA
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A 4–pole, 500 V d.c. shunt motor has 720 wave–connected conductors on its armature. The full–load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Ω. What is the full–load speed of the motor?arrow_forwardExplain how the DC and BLDC Motor works!arrow_forwardWhen the armature current of a 220 Volt DC shunt motor is 40 Amperes, when the magnetic flux suddenly decreases by 10%, armature current increases to 80 Amper, which is the armature winding resistance of the motor?arrow_forward
- How does the saturation in the machine affect the speed of shunt motor?arrow_forwardH.W 1) A 4-pole, 500 V d.c. shunt motor has 720 wave-connected conductors on its armature. The full-load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Q and the contact drop is 1 V per brush. Calculate the full-load speed of the motor. H.W 2) A d.c. series motor with series field, and armature resistance of 0.06 ohm and 0.04 ohm respectively is connected across 220 V mains. The armature takes 40 A, and its speed is 900 rpm. Determine its speed when the armature takes 75 A, and excitation is increased by 15% due to saturation.arrow_forwardA 250 V d.c. shunt motor takes a current of 20 A. Resistance of shunt field winding is 200 ohm and the armature is 0.3 ohm. What is the current in the armature ?arrow_forward
- When a series dc motor is operated without a load, which of the following conditions occurs? * O The armature speeds out of control The armature draws excessive current O The voltage requirement increases O The armature will not turn O O Oarrow_forwardWhen the armature current of a 220V DC shunt motor is 40Amper, the armature current of the motor increases to 80A when the magnetic flux suddenly drops by 10%. Which of the following is the armature winding resistance of the motor?arrow_forwardWhich of the following method is used to control the speed of DC motor above its rated speed? A)Armature control B)Voltage control C)Field control D)None of optionarrow_forward
- A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.arrow_forwardA 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?arrow_forward*Urgent need in 5 mins please* A 900 rpm, 4 pole lap wound shunt motor takes 300 A. The flux per pole is 0.02 Wb and the armature has 1500 conductors. The shunt field takes 4 A of current. Solve for power developed in the armature (W).arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning