Speed Controlers

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There are advantages of using electronic speed controllers. They provide soft starting which is combined with step-less speed control and the use of an inexpensive standard squirrel cage motor

However there are disadvantages in using such technology

State two of these:
- -Higher cost
- -Possibility of interference voltages
Explain the difference in the switching component between half wave and full wave speed control

In the half-wave, speed control is obtained using a diac.

In full-wave however, speed control is reached by using a triac
When we control a universal motor with a centrifugal governor we obtain a constant speed machine. What is meant by this term?

This means the speed does not vary with torque. The steady-speed characteristic may be obtained at other speeds by adjusting the governor