Labview Based Speed Control of Single Phase Induction Motor by V/F Control Method

Induction Motors are also known as "Workhorse of the Industry". This is because it is one of the most widely used motors in the world. It is used in transportation, industries, household appliances, and laboratories. The speed control methods are pole changing, frequency variation, variable rotor resistance, variable stator voltage, constant v/f control, slip recovery method etc., Except V/f control method, all methods have certain limitation. In the proposed method, the V/f ratio is kept constant using LabVIEW which in turn maintains the magnetizing flux constant so that the maximum torque remains unchanged and the efficiency gets maintained. Thus, the wide range of speed control is achieved. It is effortless, cost-effective and easier to design in open loop. This proposed method can be extended in future to control the speed of induction motor in closed loop. In closed loop method, the steady state and outputs are controlled much higher than open loop.