© 2006 GE ECM by Regal-Beloit
- 75 -
Indoor Blower Motors
v0.2
As of July 2006, the current applications of the X13 include single stage:
Air Handlers/Fan Coils Package Systems
The efficiency of the X13 helped some manufacturers get their product up to 13
SEER.
The X13 standard ECM motor uses less energy (watts) than the PSC motor both at
rated speed and constant fan mode. The charts below show Airflow (CFM) on the
left and Static Pressure (ESP) along the bottom. Notice at 0.5 in. wc. the X13 is
using less energy and making more airflow.
The X13 motor is programmed to provide constant torque. Or simply put, if
static pressure changes, the motor program will only maintain the amount of
programmed torque. This should not be confused with constant airflow. Even though
the X13 can maintain torque, if static pressure increases, airflow will decrease,
similar to the PSC motor curve shown above. However, airflow will not decrease as
poorly as a PSC motor, since torque is being maintained.
If the static pressure on these systems went up to 0.8 in. wc., the X13 motor would
be making almost 1200 CFM, whereas the PSC motor would only be at 1000 CFM.
This is because the PSC motor cannot maintain torque if pressure increases.
So even though the X13 operates by constant torque, it still provides airflow on a
curve just like the PSC motor in response to changes in static pressure. Only it holds
that curve up a little better than the PSC motor does.
X13 Motor Airflow Example
1000
1100
1200
1300
1400
1500
0 0.2 0.4 0.6 0.8 1
Static Pressure
Airflow (CFM)
X13 Air High Speed
X13 Air Low Speed
PSC Motor Airflow Example
1000
1100
1200
1300
1400
1500
0 0.2 0.4 0.6 0.8 1
Static Pressure
Airflow (CFM)
PSC Air High Speed
PSC Air Low Speed
(300)
(324)
(338)
(372)
(237)
(255)
(263)
(Watts)
(535)
(502)
(460)
(390)
(462)
(406)
(385)
(Watts)
0.5 0.5
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