Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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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.
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Explain how does the current will be reduced during the starting of the motor.
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?
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
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- A 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_forwardAnswer please in 10 minutesarrow_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_forward
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