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A constant V/f controlled induction motor is fed from a variable voltage variable frequency three phase voltage source inverter. The motor is operated within the base speed. Which of the following is true in torque-speed characteristics of this motor?
  • a)
    Starting torque decreases with decrease in frequency and maximum torque decreases.
  • b)
    Starting torque increases with decrease in frequency and maximum torque remains unchanged.
  • c)
    Starting torque decreases with decrease in frequency and maximum torque remains unchanged.
  • d)
    Starting torque increases with decrease in frequency and maximum torque decreases.
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A constant V/f controlled induction motor is fed from a variable volta...
Explanation:

Starting Torque:
- In a constant V/f controlled induction motor, the starting torque is directly proportional to the square of the applied voltage and inversely proportional to the frequency.
- As the frequency decreases, the starting torque of the motor increases due to the decrease in the back EMF, resulting in a higher current flow and increased torque.

Maximum Torque:
- The maximum torque in a constant V/f controlled induction motor occurs at the base speed where the ratio of voltage to frequency is maintained.
- As long as the motor is operated within the base speed range, the maximum torque remains unchanged regardless of the frequency.
Therefore, in the torque-speed characteristics of this motor, the starting torque increases with a decrease in frequency while the maximum torque remains unchanged.
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A constant V/f controlled induction motor is fed from a variable voltage variable frequency three phase voltage source inverter. The motor is operated within the base speed. Which of the following is true in torque-speed characteristics of this motor?a)Starting torque decreases with decrease in frequency and maximum torque decreases.b)Starting torque increases with decrease in frequency and maximum torque remainsunchanged.c)Starting torque decreases with decrease in frequency and maximum torque remains unchanged.d)Starting torque increases with decreasein frequency and maximum torquedecreases.Correct answer is option 'B'. Can you explain this answer?
Question Description
A constant V/f controlled induction motor is fed from a variable voltage variable frequency three phase voltage source inverter. The motor is operated within the base speed. Which of the following is true in torque-speed characteristics of this motor?a)Starting torque decreases with decrease in frequency and maximum torque decreases.b)Starting torque increases with decrease in frequency and maximum torque remainsunchanged.c)Starting torque decreases with decrease in frequency and maximum torque remains unchanged.d)Starting torque increases with decreasein frequency and maximum torquedecreases.Correct answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A constant V/f controlled induction motor is fed from a variable voltage variable frequency three phase voltage source inverter. The motor is operated within the base speed. Which of the following is true in torque-speed characteristics of this motor?a)Starting torque decreases with decrease in frequency and maximum torque decreases.b)Starting torque increases with decrease in frequency and maximum torque remainsunchanged.c)Starting torque decreases with decrease in frequency and maximum torque remains unchanged.d)Starting torque increases with decreasein frequency and maximum torquedecreases.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A constant V/f controlled induction motor is fed from a variable voltage variable frequency three phase voltage source inverter. The motor is operated within the base speed. Which of the following is true in torque-speed characteristics of this motor?a)Starting torque decreases with decrease in frequency and maximum torque decreases.b)Starting torque increases with decrease in frequency and maximum torque remainsunchanged.c)Starting torque decreases with decrease in frequency and maximum torque remains unchanged.d)Starting torque increases with decreasein frequency and maximum torquedecreases.Correct answer is option 'B'. Can you explain this answer?.
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