© 2006 GE ECM by Regal-Beloit
- 6 -
Indoor Blower Motors v0.2
PSC (Permanent Split Capacitive) Motor Operation
The PSC motor is a slave to the frequency of the supplied voltage, the poles of the
motor, and the load on the motor.
- A 6 pole motor at 60Hz has a theoretical speed of 1200 rpm, with a typical
rated speed of 1050 rpm.
- However it can only run at the rated rpm to make the designed airflow if the
static pressure is also at the design rating.
- Without the ability to add power and increase the speed of the motor, it simply
moves less air when static pressure increases.
Demands Speeds
- 1
st
stage heat - Up to 5
- 2
nd
stage heat
- 1
st
stage cool
- 2
nd
stage cool
- Continuous fan
- De-humidification
- Emergency Heat
The PSC motor suffers from to many demands and not enough options, audible
start/stop noise, and low efficiency.
- Three stage
- Modulating
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