7. The rotor resistances per phase of a 4-pole, 50-Hz, 3-phase induction motor are 0.024 ohm and 0.12 ohm respectively. Find the speed at maximum torque. Also find the value of the additional rotor resistance per phase required to develop 80% of maximum torque at starting.

7. The rotor resistances per phase of a 4-pole, 50-Hz, 3-phase induction motor are 0.024 ohm and 0.12 ohm respectively. Find the speed at maximum torque. Also find the value of the additional rotor resistance per phase required to develop 80% of maximum torque at starting.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

See similar textbooks

Related questions

Q: Q#4: Obtain an expression for the condition of maximum torque of 3-phase induction motor. Sketch the…

Q: A 75 kW, 440 V, Y-connected,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

Q: PLS ANSWER AS SOON AS POSSIBLE The rotor resistance and reactance per phase of 4-pole, 50 hz,…

A: The solution is given below

Q: . A4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill…

Q: am. output and efficiency. Also estimate the starting torque and maximum torque at is at its…

Q: QI/Prove that the power developed by a three-phase induction motor is maximum when the equivalent…

A: in the case of the induction machine, we have stator side referred reactance as X01 and resistance…

Q: A 75 kW, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

Q: 6. A 75-HP, three-phase, six-pole, 60-Hz, Y-connected, cylindrical-rotor synchronous motor has…

Q: 8. A4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill…

A: as per our guidelines we are supposed to answer?️ only one question. Kindly repost other questions…

Q: A 75 kW, 440 V, Y-connected,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

Q: 3 phase induction motor has max. torque of 250% and the starting torque of the 150% with respect to…

Q: Q5//Answer for the following question: 1- Can we get maximum torque at start in an induction motor,…

A: Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: A 10-pole 60-Hz synchronous motor operates with a developed power of 100 hp, which is its rated full…

A: NO OF POLES, P = 10 FREQUENCY, f = 60 Hz TORQUE ANGLE, θ = 20o DEVELOPED POWER, Po = 100 HP =…

Q: a) In the experiment of performance study of three-phase wound rotor induction motor, what are the…

A: 1)Upon adding external resistance on the, a)Motor slip, The speed of the motor decreases. b)Motor…

Q: A 4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor p resistance of 0.3 2 and…

A: In this question we will find ratio of maximum torque to full load torque and speed at which maximum…

Q: A 75 kW, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

Q: am. output and efficiency. Also estimate the starting torque and maximum torque at is at its…

Q: For a 3-phase induction motor, what fraction/multiple of supply voltage is required for a…

Q: A 75 kW, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

A: Given: A 75kW ,440V,Y connected ,3 phase, 6 pole, 50Hz wound rotor induction motor in which…

Q: A 75 kW, 440 V, Y-connected ,3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip…

A: Because of our policy only first question will be answered. Given: E=440 Vs=0.04sm=0.2x1=x2=0.5 Ω/ph…

Q: A single-phase induction motor with a 4-pole, 50-Hz, 130-V, is rotating in the clockwise direction…

A: Single phase induction motor have 4 pole, 50Hz frequency, Rotor speed N= 1450rpm Determine the per…

Q: Draw the torque vs Speed characteristics of series-wound DC motor and shunt DC motor. At the time of…

A: The torque vs Speed characteristics of series-wound DC motor is shown below: The torque vs Speed…

Q: electrical machines Explain the load operation test by drawing the test connection diagram of the…

A: INDUCTION MOTOR: Based on the rotor construction, the induction motor is classified into Squirrel…

Q: A 6-pole, 50 Hz, 3-phase induction motor with a rotor resistance of 0.25 ohm develops a maximum…

A: Given, A 6-pole, 50 Hz, 3-phase induction motor with Rotor resistance, R2 = 0.25 ohm Rotor speed,…

Q: Sketch a typical torque vs speed curve for a high efficiency induction motor

A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: A 3-phase, 5-hp, 60Hz, 115-V, four-pole induction motor operating at rated voltage, rated frequency,…

A: The rated load is Pshaft= 5 hp, So 125% of load is , 5125100hp=6.25 hp a) The formula for input…

Q: e. For an induction motor on no-load, how speed, rotor current, stator current, power factor, and…

Q: Q4) discuss two of the following:- a) principle operation of (1Ø induction motor)? b) why is the…

A: The 1-φ induction motor are also called as Fractional horse power or fractional kilo watt motor.…

Q: What is the effect of load on the efficiency of an induction motor?

A: The explanation is as follows.

Q: 5. (a) What would be the effect on the speed-torque characteristics of an induction motor produced…

A: (a) The torque developed in the induction motor is directly proportional to the square of the supply…

Q: Q6: A. A 12-pole, 3-phase, star-connected induction motor turns at 660 V, 50 Hz. It has a slip-ring…

A: No. of poles (P) = 12 Supply frequency (f) = 50 Hz Rotor resistance/ph (R2) = 0.03 Ω Rotor…

Q: question A single-phase induction motor with a 4-pole, 50-Hz, 130-V, is rotating in the clockwise…

A: per unit slip in forward direction is Ns-NrNs. per unit slip in backward direction is Ns+NrNs.…

Q: A 6-pole, 50 Hz, 3-phase induction motor has rotor resistance and reactance per phase of 0.0 and 0.1…

A: In this question induction motor is given...We have to find out speed for torque maximum..And…

Q: For a certain polyphase induction motor, which at full load operates at Its maximum power factor,…

A: Under the voltage control method, the torque is directly proportional to the square of the voltage.…

Q: 5. Obtain an expression for the condition of maximum torque of an induction motor. Sketch the torque…

A: We have to derive the expression when the torque of the induction motor is maximum. Thus, I chose…

Q: A 3 phase, 50 Hz, six pole induction motor has a rotor resistance of 0.1N and reactance of 0.92 N.…

A: Given values are - Rr=0.1ohmXr=0.92ohmSfl=3%=0.03

Q: Q3. (a) For a three-phase squirrel-cage induction motor (SCIM), explain: (i) Why is the motor…

Q: Q2: A single-phase induction motor with a 4-pole, 50-Hz, 130-V, is rotating in the clockwise…

A: Slip=Ns-NrNs. Nr is rotor speed Ns is sycronous speed of rotating magnetic field. Forward slip is…

Q: Q2: A single-phase induction motor with a 4-pole, 50-Hz, 130-V, is rotating in the clockwise…

A: Slip of Induction motor is sycronous speed-rotor speedsycronous speed Forward branch resistance…

Q: Q21/ A 6-pole, 50 Hz, 3-phase induction motor has rotor resistance and reactance per phase of 0.022…

Q: a- Explain the difference in the Torque-Speed Characteristics of DC Shunt and series Motors.

A: According to guidelines we need to solve only the first question. According to the question, Explain…

Q: 8) What is an advantage if the starting Torque of the induction motor is higher than the nominal…

A: a) Torque is basically a force when applied to an object rather than push or pull the object it…

Q: Explain with diagrams the operation of single stack variable reluctance stepper motor. Is it…

A: To Explain with diagrams the operation of single stack variable reluctance stepper motor.

Q: A three phase, 50Hz, 6-pole squirrel cage induction motor runs at 960-rpm on full load. The stand…

A: F=50 Hz Poles P=6 Rotor resistance per phase R2=0.01 Ω Rotor resistance per phase X2=0.05Ω Full load…

Q: a) In the experiment of performance study of three-phase wound rotor induction motor, what are the…

Q: Explain the speed-current, torque-current and speed-torque characteristics of dc series motor.

A: we need to draw speed current, torque current and speed torque characteristics of dc series motor.

Q: The rotor resistance and standstill reactance of a 3-phase induction motor are respectively 0.015…

Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

7.
The rotor resistances per phase of a 4-pole, 50-Hz, 3-phase induction motor are 0.024 ohm and 0.12
ohm respectively. Find the speed at maximum torque. Also find the value of the additional rotor
resistance per phase required to develop 80% of maximum torque at starting.
1000

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

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

Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction motor? Explain your answer.
200 +21. If maximum torque of an induction motor is kg-m at a slip of 12%, the torque at 6% slip would be...... kg-m. 1 (a) 100 (b) 160 (c) 50 (d) 40 B, 1993)
Draw the typical speed-torque characteristic of the induction motor and expain it.
B/ Fill in the blanks: TV ezur 1- In a three-phase induction motor iron losses in stator will be..... that in rotor. 2- In three-phase induction motors sometimes copper bars are placed deep in the rotor to........... 3- Blocked rotor test on induction motors is used to find out. R..., ke, X. 4- The maximum torque in an induction motor depends on .............and .....
An induction motor has rotor resistance of 6 (ohm) and reactance of 8(ohm). Neglect stator resistances and reactance. Find value of slip at maximum torque.
Q.14. What is slip in an induction motor? Q.15. What is the value of slip at start in an induction motor?
Torque-speed characteristics for three phase induction motor 4. Discuss the following (rated torque, starting torque, break down torque).
1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be....... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2. When maximum starting torqua ic ohtoinod
2. Describe the Torque-Slip characteristics of a three phase induction motor.
Derive the torque equation for a three phase induction motor, with the help of torque speed characteristics curve briefly explain how an induction motor can operate in stable region.
A 6-pole, 3-phase, 50 Hz induction motor develops a maximum torque of 30 Nm at 960 r.p.m. Determine the torque exerted by the motor at 5% slip. The rotor resistance per phase is 0.6ohm.
A 50-KW, 220V, 50 Hz, squirrel-cage three-phase induction motor is needed to rotate a mine conveyor belt drive. The motor starts sometimes under load, but most of the time is needed to run at rated speed and slip of 3.5%. Propose an appropriate design of this drive motor in order to suit the application. Motivate and then illustrate your design with suitable drawings and speed (slip)-torque graphs.