Electronically commutated motors (ECM) represent an advance in blower motor efficiency that saves substantial energy and improves aspects of overall system performance. ECMs are brushless motors developed by General Electric, which owns the trademark on the name.
How does an ECM blower motor work?
An ECM can be described simply as a basic electric motor, operated by a microprocessor- based motor control. Instead of line voltage being provided directly to the winding (speed taps) to energize the motor (as in PSC and shaded-pole motors), line-voltage power is supplied continuously to the motor control.
Is an ECM motor worth it?
ECM motors are expected to keep homeowners more comfortable, too. First, they provide more efficient airflow. … Some homeowners may opt for repairing an old furnace, but it can be a costly decision when compared to the energy savings of replacing it with an energy efficient furnace.
How do you test a ECM blower motor?
This plug carries control signals between the IFC and the ECM Motor. If the motor does not run, make sure you have power to the IFC board and then check the voltage between pins 4 and 5 of the 5 pin plug on the motor. You should read 115 volts. If voltage is not present, the motor will not run.
Are all ECM motors variable speed?
Both variable speed and X13 motors are ECM or “Electronically Commutated Motors,” This means the DC power that drives them is electronically switched from positive to negative to spin the motor. … The primary difference is the type of inputs to the motor control.
Are ECM motors quieter?
ECM motors are very high efficiency (65% to 80%) electric motors. … ECM motors are also quieter than traditional inefficient motors, have longer design life and require less maintenance.
What is the difference between a PSC and ECM motor?
PSC motor (permanent split capacitor) – Runs at a constant speed. ECM motor (electronically commuted motor) – Runs at a variable speed. This provides several benefits, including energy savings, lower need for maintenance, improved comfort and better airflow and indoor air quality.
Why do ECM motors fail?
Some older ECM motors will overheat and even fail when constantly running in over-amped conditions. Newer models are designed to drop airflow but time will tell on how well they will hold up. Other consequences of high static installations include noise at the registers from higher air velocities.
How much does an ECM motor cost?
So even though the initial cost of an ECM can be high, the overall energy savings typically balance out that price in the long run. ECMs typically cost $1499 – $1875; PSCs are $499 – $625.
Do ECM motors use capacitors?
ECM Motors = Energy savings and added functionality
PSC motors, or permanent split capacitor, use non-polarized capacitors and brushes to deliver electricity to the rotating parts. … ECM motors do not use brushes, thereby reducing maintenance and extending service life.
Are ECM motors more efficient?
At low speed the ECM is over 30% more efficient than a standard induction motor. The ECM motor has a minimum efficiency of 70% throughout its entire operating range. Conventional induction motors become less efficient at the reduced speeds that are typically selected for fan powered applications.
What are the principal advantages of ECM motors?
It’s either running at full output or it’s not running at all. The energy consumption of the motor is therefore fixed at a single maximum rate. Electronically commutated motors (ECM) represent an advance in blower motor efficiency that saves substantial energy and improves aspects of overall system performance.
Is a variable speed blower worth it?
The best news … a variable speed furnace motor is 80–85% more efficient than a standard furnace motor. So, if you are going to upgrade from a 90% to a 96% efficient furnace make sure it has a variable speed furnace motor, and you could enjoy energy savings of up to $400 a year. Otherwise it’s not worth the investment.
Does an ECM motor need a VFD?
Ease of Control: ECMs are DC motors that function using a built-in inverter and a magnet rotor (no external VFD). … Wider Operating Range: ECM motors also have a wider operating range than traditional induction motors, which means that one ECM motor can replace a number of induction motor models.