Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 53, Problem 4SQ
To determine
Write the type of a gear motor that subjects to continual reversing during an eight-hour production shift.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
208V, 10 Hp , 4 Pole , 60 Hz , Y connected induction motor has a full load slip of 5 percent.
a)what is the synchronous speed of this motor ?
b)what is the rotor speed of this motor at rated load ?
cWhat is the rotor frequency of this motor at rated load ?
d)what is theshaft torque of this motor at rated load?
3. The slip-ring rotor resistance and standstill reactance per phase of a 3300 V, 24-pole, 50 Hz, 3-phase star-connected induction motor are 0.02 ohm and 0.3 ohm respectively. Calculate the (a) speed at maximum torque (b) ratio of full load torque to maximum torque if the full load
speed is 246 rpm
A 25 hp,250V long shunt compound motor takes 5 A when running light and runs at 1150 rpm. Armature resistance, 0.15 ohm, Shunt field resistance, 200 ohm and series field resistance, 0.05 ohm. At rated load the motor takes 86.5A and runs at 720 rpm. Determine the ratio of torque developed from no-load to full load.
Chapter 53 Solutions
Electric Motor Control
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
- Why is the starting torque per A of starting current of a wound-rotor motor higher than that of a squirrel-cage motor although the starting current is less?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardOn the nameplate of a star-ring induction motor: 75 kW, 16 A, 380V, 1430 rpm. It is written coso-0.82 and f-50 Hz. If the ratio between Tipping (Maximum torque) and Rated torque of the motor is 2.2, find the overturn slip (Slip where the maximum torque occurs).arrow_forward
- A series motor having an armature resistance of 0.1Ω and a field resistance of 0.15Ω, takes 48A at 230V and 720 rpm. The total core and friction losses are 650W. Neglecting stray-load and brush contact losses, the load of the motor is reduced so that the motor now takes 32A. Find the motor speed. 1100rpm 1235rpm 700rpm 600rpmarrow_forwardemachines A 4.12 kV, 60 Hz, 3000-hp, 0.8 pf-leading, delta-connected, three-phase synchronous motor has a synchronousreactance of 1.1 per unit and an armature resistance of 0.1 per unit. If this motor is running at rated voltage with aline current of 300 A at 0.85 pf leading, what is the internal generated voltage per phase inside this motor? Whatis the torque angle?arrow_forward4. A synchronous motor starts but fails to develop its full torque. What could it be due to? 5. What is the relationship between speed and torque regulation in dc shunt motors?arrow_forward
- Why is the starting torque of the series motor high?arrow_forwardA 4.12 kV, 60 Hz, 3000 hp, 0.8 FP lead, delta-connected, 6-pole, three-phase synchronous motor has asynchronous reactance of 1.1 per unit and an armature resistance of 0.1 per unit.If this motor works in nominal conditionsd) What is the internal generated voltage per phase within the motor?e) What is the delta torque angle?f) What is the torque generated by the motor?arrow_forwardA series motor, having an armature resistance of 0.1 and a field resistance of 0.15 takes 48 A.at 230 V and 720 rpm. The total core and friction losses are 650 W. Neglecting stray-load and brush-contact losses, calculate (a) the developed torque,arrow_forward
- A series motor, having an armature resistance of 0.1 ohm and a field resistance of 0.15ohm takes 48 A.at 230 V and 720 rpm. The total core and friction losses are 650 W. Neglecting stray-load and brush-contact losses, calculate (a) the developed torque,arrow_forwardA 50HP, 440V, three-phase, 60-Hz squirrel cage induction motor is operating at full-load with 0.8 lagging power factor. The full-load effieciency is 85% and the percentage slip is 5%. Determine the full-load torque of the motor.arrow_forwardExplain how to reverse the direction of rotation of a stabilized-shunt motor? What is the condition when this motor will operate as differential compound motor ?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