![]() ![]() They use a microprocessor controller to sequentially energize and de-energize each winding of the stator with power that generates an electrical current. ![]() (Although an AC current is used for ECM, the ECM’s internal rectifier converts the current to DC voltage). They function using a built-in inverter and a magnet rotor, and as a result, can achieve greater efficiency in air-flow systems than some kinds of AC motors. ECM BasicsĮCMs are a type of DC motor. They are also called DC fan motors, EEM fan motors, and variable speed fan motors. This article explains what ECMs are and how they work. Simply put, they use electronic controls to vary their speed. Electronically Commutated Motors (ECMs) were developed to offer a greater range of operability choices, and to minimize noise. AC motors have been used in past applications to serve as the primary air driving force, but they are not always the most efficient choice because they run continuously at full power. An HVAC system depends heavily upon the quick movement of air from one location to another to achieve heating or cooling. HVAC systems are especially important when it comes to designing large office buildings or climate-controlled environments, such as some aquatic enclosures at the zoo. HVAC ( Heating, Ventilating, and Air Conditioning) refers to systems that heat or cool a designated environment. ![]()
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