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The torque of a reluctance motor can be effectively decreased by
- a)decreasing reluctance of the magnetic circuit along the quadrature axis
- b)increasing reluctance of the magnetic circuit along the direct axis
- c)increasing the ratio of quadrature axis reluctance to direct axis reluctance
- d)decreasing the ratio of quadrature axis reluctance to direct axis reluctance
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The torque of a reluctance motor can be effectively decreased bya)decr...
Torque developed in a reluctance motor is given by
Te ∝ (Rlq - Rld)
If Rlq/Rld is less, it means Rlq < RId and thus, Te is less.
Te ∝ (Rlq - Rld)
If Rlq/Rld is less, it means Rlq < RId and thus, Te is less.
Most Upvoted Answer
The torque of a reluctance motor can be effectively decreased bya)decr...
Torque of a reluctance motor is prop to ( 1/xq-1/xd) now , reactance , or lets say inductance is inversely prop to reluctance , thus 1/xq need to be less , means quadrature axis reluctance need to be less . hence Rq/Rd need to be less for reducing torque of a reluctance machine
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The torque of a reluctance motor can be effectively decreased bya)decr...
Explanation:
To understand why the torque of a reluctance motor can be effectively decreased by decreasing the ratio of quadrature axis reluctance to direct axis reluctance, let's first understand the basic principle of operation of a reluctance motor.
A reluctance motor operates based on the principle of reluctance torque. It consists of a stator with windings and a rotor with salient poles. When the stator windings are energized, a magnetic field is produced, which interacts with the salient poles of the rotor. The rotor aligns itself with the stator field due to the principle of minimum reluctance.
Reluctance Torque:
Reluctance torque is generated due to the tendency of the rotor to align itself with the stator field. The magnitude of reluctance torque depends on the difference in reluctance along the direct axis (aligned with the stator field) and the quadrature axis (perpendicular to the stator field) of the rotor.
Effect of Reluctance Ratio:
The ratio of quadrature axis reluctance to direct axis reluctance plays a crucial role in determining the torque characteristics of the reluctance motor. Here's how each option affects the torque:
a) Decreasing reluctance of the magnetic circuit along the quadrature axis:
This option would increase the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would increase, leading to an increase in the overall torque of the motor.
b) Increasing reluctance of the magnetic circuit along the direct axis:
This option would decrease the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would decrease, leading to a decrease in the overall torque of the motor.
c) Increasing the ratio of quadrature axis reluctance to direct axis reluctance:
This option would increase the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would increase, leading to an increase in the overall torque of the motor.
d) Decreasing the ratio of quadrature axis reluctance to direct axis reluctance:
This option would decrease the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would decrease, leading to a decrease in the overall torque of the motor. This is the correct option.
Conclusion:
In summary, the torque of a reluctance motor can be effectively decreased by decreasing the ratio of quadrature axis reluctance to direct axis reluctance. This reduces the difference in reluctance between the two axes, resulting in a decrease in the reluctance torque and overall motor torque.
To understand why the torque of a reluctance motor can be effectively decreased by decreasing the ratio of quadrature axis reluctance to direct axis reluctance, let's first understand the basic principle of operation of a reluctance motor.
A reluctance motor operates based on the principle of reluctance torque. It consists of a stator with windings and a rotor with salient poles. When the stator windings are energized, a magnetic field is produced, which interacts with the salient poles of the rotor. The rotor aligns itself with the stator field due to the principle of minimum reluctance.
Reluctance Torque:
Reluctance torque is generated due to the tendency of the rotor to align itself with the stator field. The magnitude of reluctance torque depends on the difference in reluctance along the direct axis (aligned with the stator field) and the quadrature axis (perpendicular to the stator field) of the rotor.
Effect of Reluctance Ratio:
The ratio of quadrature axis reluctance to direct axis reluctance plays a crucial role in determining the torque characteristics of the reluctance motor. Here's how each option affects the torque:
a) Decreasing reluctance of the magnetic circuit along the quadrature axis:
This option would increase the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would increase, leading to an increase in the overall torque of the motor.
b) Increasing reluctance of the magnetic circuit along the direct axis:
This option would decrease the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would decrease, leading to a decrease in the overall torque of the motor.
c) Increasing the ratio of quadrature axis reluctance to direct axis reluctance:
This option would increase the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would increase, leading to an increase in the overall torque of the motor.
d) Decreasing the ratio of quadrature axis reluctance to direct axis reluctance:
This option would decrease the difference in reluctance between the direct and quadrature axes. As a result, the reluctance torque would decrease, leading to a decrease in the overall torque of the motor. This is the correct option.
Conclusion:
In summary, the torque of a reluctance motor can be effectively decreased by decreasing the ratio of quadrature axis reluctance to direct axis reluctance. This reduces the difference in reluctance between the two axes, resulting in a decrease in the reluctance torque and overall motor torque.
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The torque of a reluctance motor can be effectively decreased bya)decreasing reluctance of the magnetic circuit along the quadrature axisb)increasing reluctance of the magnetic circuit along the direct axisc)increasing the ratio of quadrature axis reluctance to direct axis reluctanced)decreasing the ratio of quadrature axis reluctance to direct axis reluctanceCorrect answer is option 'D'. Can you explain this answer?
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The torque of a reluctance motor can be effectively decreased bya)decreasing reluctance of the magnetic circuit along the quadrature axisb)increasing reluctance of the magnetic circuit along the direct axisc)increasing the ratio of quadrature axis reluctance to direct axis reluctanced)decreasing the ratio of quadrature axis reluctance to direct axis reluctanceCorrect answer is option 'D'. 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 The torque of a reluctance motor can be effectively decreased bya)decreasing reluctance of the magnetic circuit along the quadrature axisb)increasing reluctance of the magnetic circuit along the direct axisc)increasing the ratio of quadrature axis reluctance to direct axis reluctanced)decreasing the ratio of quadrature axis reluctance to direct axis reluctanceCorrect answer is option 'D'. 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 The torque of a reluctance motor can be effectively decreased bya)decreasing reluctance of the magnetic circuit along the quadrature axisb)increasing reluctance of the magnetic circuit along the direct axisc)increasing the ratio of quadrature axis reluctance to direct axis reluctanced)decreasing the ratio of quadrature axis reluctance to direct axis reluctanceCorrect answer is option 'D'. Can you explain this answer?.
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