DC Motors / Electronically Commutated Motors (ECM)

Marathon is Ex-GE motors (GE's global small HVAC motors business with all its facilities was acquired in 2005 by Ms Regal of US -now Regal Rexnord) which happens to be the parent organization of Marathon. GE motors has been the pioneer/ originator of BLDC motors for HVAC applications in 1987 with DC motor development & reliability exercise starting off in early '80s. Our current DC motors popularly known as ECM motors of Marathon have factored in various generational advances since 1987. ECM technology was introduced to the residential and light commercial HVAC industry in 1987 when GE®* introduced a constant airflow “variable speed” indoor blower motor. Today, ECMs are found in outdoor condenser fan and indoor blower applications in residential and light commercial HVAC system

Three primary types of ECM/DC motors designed & manufactured by Regal Rexnord/Marathon :

  • DC motor with full controls
  • DC motor with half control (economical version...popular in India) &
  • DC motor without controls (i.e. bare dc motor).

Regal Rexnord /Marathon US has designed, manufactured & supplied millions of ECM motors for HVACR applications over past 35+ years. Marathon Electric India's Faridabad plant has been manufacturing & supplying ECM (electronically commutated motors) or DC motors since over a decade to US & Middle East customers, mainly US ones and now to some in India. On an average 500000 to 800000 ECM motors get manufactured & shipped out from our Faridabad unit to US each year. Each component & vendor of ECM motor is approved by India’s R&D and Quality team (which is a thorough & detailed reliability exercise), as also duly approved with US team/ labs before employing same.

Our ECM Motors also come with UL, CSA, SASO & other key certifications . We are also engaging into & serving key India customers with dc motors past few years for HVACR applications (mainly Ducts/PACs/VRVs).

Our current Faridabad India factory is capable of making DC/ECM Motors up to 1HP (750 watt) output . We also offer mechanically & electronically customized ECM Motors as per the application and requirement of the customer.

Current Applications which our DC/ECM Motors find use in are-

  • Residential Air Conditioning – Split & Window
  • Commercial Air Conditioning – Ductless, Ducted, VRF, VRV, Packaged, Centralized – Ductless, Ducted, VRF, VRV, Packaged, Centralized

These direct drive Fractional Horsepower (FHP) motors include constant torque, constant speed and constant airflow. ECMs are the most efficient FHP motor in the market and are built with an electronic control module and motor and do not use capacitors.

ECMs are categorized into the following three types:

 

Constant Airflow ECMs

Constant Airflow ECMs (also referred to as Variable Speed ECMs) are primarily used for indoor blower motor applications. They are designed with separate line voltage and communication inputs (no speed taps) and are commonly designed with 16-pin or 4-pin communication inputs. Constant Airflow ECMs are programmed by the HVAC system manufacturer. Constant airflow ECMs were introduced to the HVAC industry to provide energy savings and support system capacity related to their ability to maintain airflow when TESP (total external static pressure) increases.

Click here if you’re looking for a constant airflow ECM replacement motor.

 

Constant Torque ECMs

Constant Torque ECMs are also primarily used for indoor blower motor applications. However, constant torque ECMs are designed with separate line voltage inputs and low voltage speed taps. They are commonly designed with 5 speed taps and are also programmed by the HVAC system manufacturer. Constant torque ECMs were introduced to the HVAC industry primarily to provide energy savings. This is evident in their adoption into HVAC systems with the 13 SEER energy regulation in 2006 and the FER energy regulation in 2019.

Click here if you’re looking for a constant torque ECM replacement motor.

 

Constant Speed ECMs

Constant Speed ECMs are primarily used for outdoor condenser fan motor applications. They are designed with separate line voltage inputs and low voltage speed taps or communication. Constant Speed ECMs are commonly designed with leads out instead of plug connections for weather protection. They are also programmed by the HVAC system manufacturer.

If you’re looking for a constant speed ECM replacement motor, contact the manufacturer of the HVAC system from which it was removed.

ECMs are complex, microprocessor-driven motors that incorporate electronic controls with a mechanical motor. However, from a user point of view, these motors are not that difficult to operate, adjust or diagnose, if you know what they require to operate properly. In fact, these motors can help reduce on-truck inventory, allowing you to complete more calls on the same day without driving to retrieve a part.

 

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