Effective, efficient operation of induction motors
By H du Preez, Consultant
Electricity+Control March 2014 (pages 22-24)
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Improving the efficiency of a motor helps to improve efficiency in the consumption of electricity - but it is a small contribution if one compares it to the energy wasted by running the motor at low - and even on no - load for long periods. Installing and controlling motor operation effectively, by selecting suitable ancillary equipment (such as variable frequency drives), can result in significant power savings in certain applications.
In searching for efficient operation and power saving, there are more options than just high and premium efficiency induction motors. Variable frequency drives offer methods of improving efficiency by controlling speed. Variable frequency drives also offer voltage reduction facilities to reduce power consumption at low loads. Besides power optimisation, fixed speed controllers with programming facilities are available to provide power control, soft start and many more functions to assist in increasing the life and reliability of both motor and driven equipment. This solution is ideal for applications where the load is not constant and/or the motor is run on no-load conditions for periods.
- Suitable ancillary equipment can result in significant power savings.
- Variable frequency drives offer methods of improving efficiency by controlling speed.
- Variable frequency drives also offer voltage reduction facilities to reduce power consumption at low loads.