Speed Control Of Induction Motor
The speed of machine is quite stiff and is dependent on the load changes the entire speed has the range from ns to (1-s)ns .machines when operating from mains is essentially a constant speed machine, many industrial applications for example fan and pump requires constant speed and hence the induction motor is best suited for that .the squirrel cage induction motor is quite rugged and has a simple construction and it is good for variable application .the speed of induction motor can be controlled in 8 ways:
• By changing applied voltage
• Rotor resistance control
• Cascade control
• By pole changing
• Stator frequency control
• Slip control
• Line voltage control
• Secondary foreign voltage control
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