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Speed Control of Three Phase Induction Motors
Three phase induction motors are invariably used in the application where in speed in required to be constant or adjustable speed for their efficient operation. Use of thyristor circuits has made it possible to control and vary its speed over a wide range. Followings methods are used to speed control 3-? induction motors:
a.Stator voltage control methods
b.Frequency control methods
c. voltage and frequency control methods
d.Stator current control methods
e.Static rotor resistance control methods
f.Slip power recovery schemes
the base of isosceles triangle and the altitude drawn from one of the congruent sides are equal to 18cm and 15cm, respectively. Find the lengths of the sides of the triangle.
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