Energy savings provided by EC motor replacement of Shaded-

Pole motors

EC motors are new energy-saving replacements for older shaded-pole motors in refrigeration and other air-moving applications. The EC (Electronically Commutated) motors use substantially less energy than shaded-pole motors.

Energy Control Equipment, Inc has designed a special ECMotor Controller, which allows control of the speed of the new EC motors. The use of this controller dramatically increases the savings provided by the EC motors.

An analysis of the potential savings provided by EC motors in various configurations was done in order to determine the best possible savings resulting from replacement of shaded-pole motors with EC motors.

EC motors were analyzed with and without the Frigitek® ECMotor Controller. In addition, EC motor replacement was compared to using a Classic Single-Phase Frigitek® with the original shaded-pole motors. The comparisons cover the range of two motors per evaporator to eight motors per evaporator.

The following two graphs show the savings provided by the three different configurations using 1/15 Hp and 1/20 Hp motors. These are the motors most commonly used in walk-in and reach-in refrigerators.

In all cases, the use of the Classic Single-Phase Frigitek with the original shaded-pole motors provides more savings than the EC motors alone.