Mindtap Electrical, 4 Terms (24 Months) Printed Access Card For Herman's Delmar's Standard Textbook Of Electricity, 6th (mindtap Course List)
6th Edition
ISBN: 9781305634312
Author: Herman, Stephen L.
Publisher: Cengage Learning
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Question
Chapter 31, 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 31 Solutions
Mindtap Electrical, 4 Terms (24 Months) Printed Access Card For Herman's Delmar's Standard Textbook Of Electricity, 6th (mindtap Course List)
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - Prob. 3RQCh. 31 - Prob. 4RQCh. 31 - What type of motor is known as a constant-speed...Ch. 31 - What is CEMF?Ch. 31 - Prob. 7RQCh. 31 - Prob. 8RQCh. 31 - Prob. 9RQCh. 31 - What type of motor should never be operated at no...
Ch. 31 - Prob. 11RQCh. 31 - What is the most common way of changing the...Ch. 31 - Prob. 13RQCh. 31 - Prob. 14RQCh. 31 - What device is used to disconnect power to the...Ch. 31 - Prob. 16RQCh. 31 - Who was the first person to establish a...Ch. 31 - One horsepower is equal to how many W?Ch. 31 - A motor is operating a load that requires a torque...Ch. 31 - The motor in Question 19 is connected to a 250-VDC...Ch. 31 - Prob. 1PA
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- Explain how the DC and BLDC Motor works!arrow_forwardANSWER ASAP WITHIN 1 HOUR.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
- H.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_forwardWhen 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_forwardASAP ASAP ASAP previous answer is wrongarrow_forward
- Which 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_forwardA 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
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