User:Jeremy RBC/draft ECM

An electronically-commutated motor (ECM) is a high-efficiency motor that is commonly used in air-movement applications, such as heating, ventilation, air conditioning (HVAC), and refrigeration equipment. The combination of a microprocessor control with a specialized form of  brushless DC (BLDC) motor that is configured for use with AC power, ECMs are a programmable motors that can replace conventional  AC induction motors in residential applications including space conditioning and household appliances such as washing machines, clothes dryers, and dishwashers. Compared to induction motors, ECMs are much more efficient, create less heat, run more quietly, and maintain efficiency across a wide range of operating speeds. ECM programmability also allows for advanced control features such as automatic torque or rotational adjustments, pre-set runtime profiles, and real-time digital serial communication.

HVAC Applications
ECMs (also known in-industry as variable-speed motors) have been used in furnaces and air conditioners since 1987.

ECM technology's higher efficiency offers the largest nation-wide opportunity for reducing residential energy consumption.

Programmed features
Since they use microprocessors to control commutation to the stator windings, they can be programmed with advanced control features such as

Variable Speed
Using PWM.

Pre-programmed runtime profiles
e.g. HVAC Climate Profiles

Sensorless rotation/torque adjustments
Despite increased external pressure (to a point) e.g. Constant torque, Constant RPM

Quieter
slower speeds, less commutation noise

Efficiency
directly from a linear voltage to output curve, indirectly from less excess heat, operational efficiencies

Longevity
esp. compared to shaded-pole

Universality
programmability means one motor does many applications