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During constant torque operation of a.c. electrical machines
- a)supply voltage or frequency has to remain constant
- b)speed has to remain constant
- c)power has to remain constant
- d)both supply voltage and supply frequency has to remain constant
Correct answer is option 'D'. Can you explain this answer?
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During constant torque operation of a.c. electrical machinesa)supply v...
The Torque vs Speed characteristics of the V/f controlled Induction motor:
- Whenever frequency is varied in order to control speed, the terminal voltage is also varied so as to maintain the V/f ratio constant.
- Thus by maintaining a constant V/f ratio, the maximum torque of the motor becomes constant for changing speed.
Formula:
The induced emf is
Ф = air-gap flux
Bmax = Maximum flux density
f = Supply frequency
n= No.of turns
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The Torque vs Speed characteristics of the V/f controlled Induction motor is shown below.
Fig: BratedBrated size 12{B rSub { size 8{ ital "rated"} } } {}" id="MathJax-Element-49-Frame" role="presentation" style="display: inline; font-size: 14px; position: relative;" tabindex="0">The Torque vs Speed characteristics of the V/f controlled Induction motor
Thus maintaining the V/f ratio constant helps us to maintain a constant maximum torque while controlling the speed.
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During constant torque operation of a.c. electrical machinesa)supply v...
Constant Torque Operation of A.C. Electrical Machines
Constant torque operation of A.C. electrical machines refers to a situation where the torque produced by the machine remains constant regardless of the speed at which the machine is operating. In such cases, it is important to ensure that both the supply voltage and supply frequency remain constant in order to maintain the desired torque output.
Explanation:
Supply Voltage and Frequency
- In A.C. electrical machines, the torque produced is directly proportional to the product of the magnetic field strength and the current flowing through the machine.
- The magnetic field strength is determined by the supply voltage, while the current flowing through the machine is influenced by the supply frequency.
- Therefore, in order to maintain a constant torque output during operation, both the supply voltage and supply frequency must remain constant.
Impact on Speed and Power
- While maintaining constant torque, the speed of the machine may vary depending on the load requirements. However, the torque output remains constant due to the fixed supply voltage and frequency.
- Similarly, the power consumed by the machine may vary with changes in speed, but the torque output remains constant as long as the supply voltage and frequency are held constant.
In conclusion, during constant torque operation of A.C. electrical machines, it is crucial to ensure that both the supply voltage and supply frequency remain constant. This helps to maintain the desired torque output and ensures efficient operation of the machine.
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During constant torque operation of a.c. electrical machinesa)supply voltage or frequency has to remain constantb)speed has to remain constantc)power has to remain constantd)both supply voltage and supply frequency has to remain constantCorrect answer is option 'D'. Can you explain this answer?
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