12.4.9. Induction Motor Drive Control Techniques

The control techniques of an induction motor can be divided into three major categories:
1) Scalar control techniques
    Scalar control relates only to the magnitude control of a variable and the command and feedback signals are dc quantities, which are proportional to the respective variables. Scalar control can be achieved through the following methods:
a) By varying the rms value of the stator voltage and keeping the frequency constant. Simple control method but reduces the capability of the generated electromagnetic torque.
b) By varying the frequency of the stator voltage and keeping the rms value constant. Simple control method but reduces the capability of the generated electromagnetic torque. ...

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