The motor in Problem 15.2 drives a load characterised by the relation T₁ = ko where T, is the shaft torque and wo is the motor speed. Operation is required to give rated torque at rated speed of 960 rpm and also to supply the appropriate load at speed of 640 rpm at which the power factor is dropped to 0.6. If the motor operates at full voltage at its upper speed, estimate roughly, the change of thyristor firing-angle necessary to achieve satisfactory operation of the motor at the lower speed. Assuming that the motor impedance is unchanged between the two speeds. [ Ans: 37° ≤a ≤90°]
The motor in Problem 15.2 drives a load characterised by the relation T₁ = ko where T, is the shaft torque and wo is the motor speed. Operation is required to give rated torque at rated speed of 960 rpm and also to supply the appropriate load at speed of 640 rpm at which the power factor is dropped to 0.6. If the motor operates at full voltage at its upper speed, estimate roughly, the change of thyristor firing-angle necessary to achieve satisfactory operation of the motor at the lower speed. Assuming that the motor impedance is unchanged between the two speeds. [ Ans: 37° ≤a ≤90°]
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![The motor in Problem 15.2 drives a load characterised by the relation
T₁ = k wo where T, is the shaft torque and is the motor speed. Operation
is required to give rated torque at rated speed of 960 rpm and also to
supply the appropriate load at speed of 640 rpm at which the power factor
is dropped to 0.6. If the motor operates at full voltage at its upper speed,
estimate roughly, the change of thyristor firing-angle necessary to achieve
satisfactory operation of the motor at the lower speed. Assuming that the
motor impedance is unchanged between the two speeds.
[ Ans: 37° ≤ a ≤ 90°]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F46fc9c52-ff45-49aa-a29e-4e45defb21e0%2F80dac14e-dc82-4a78-b55b-97374e0fb482%2Fxbotd65_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The motor in Problem 15.2 drives a load characterised by the relation
T₁ = k wo where T, is the shaft torque and is the motor speed. Operation
is required to give rated torque at rated speed of 960 rpm and also to
supply the appropriate load at speed of 640 rpm at which the power factor
is dropped to 0.6. If the motor operates at full voltage at its upper speed,
estimate roughly, the change of thyristor firing-angle necessary to achieve
satisfactory operation of the motor at the lower speed. Assuming that the
motor impedance is unchanged between the two speeds.
[ Ans: 37° ≤ a ≤ 90°]
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