4. Starting and speed control at constant frequency and voltage

Readers may also wish to refer to the article Asynchronous motors. Choices and related problems.

4.1 Reduced voltage starting

Figure 14 a shows the usual admittance diagram for a motor of the industrial type: the center C and very close to the reactive power axis, the points P ₁ and P _× are very close both to each other and to this axis. The point P _n , corresponding to the nominal slip g _n , is located in the left-hand part of the circle so that O P _n...

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