Over the past few years, electronic devices for reducing the energy consumption of electric motors have entered the market place. These devices basically regulate the power delivered to an appliance's motor by continuously adjusting the 60 cycle sine wave from the utility to match changes in the load on the motor.

The larger the motor, or the more mismatched the motor and load are, the larger the potential savings in energy that a power control device will achieve. If the load never varies, it is more efficient to always match the motor closely to the expected load than to add one of these devices. Motor loads that do vary can benefit most from these controlling devices.

Because the controller continuously applies the correct power to the motor, the motor operates consistently at its peak efficiency and cooler. As a consequence of this, manufacturers of these devices claim they will improve the efficiency and life expectancy of electric appliance motors.

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