ECM motors are getting more popular!

  More and more multi-speed and variable-speed motors are being incorporated into HVACR systems to increase the efficiency of the equipment. Variable-speed motors go by several names. You may hear a variable-speed motor referred to as a “brushless permanent magnet” (BPM) device, as an “electronic commutated motor” (ECM), or as an “integrated controlled motor” (ICM). …

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