Slide
Nş
Quarterly Business Review
April 17, 2008
Steve Evon
Engineering Manager
Simplified
installation and reduced maintenance are the major selling points
No
gear, line shaft, couplings guards, etc
Biggest
gains in energy savings when system takes advantage of airflow
Reduces
the overall Motor HP requirements for the fan
50-60% energy savings are typical
Applying
drives on NEMA induction motors saves a similar amount of energy as with the Baldor PM direct drive motor
solution
Old
retrofits can show significant energy savings
Both PM or Induction motor upgrades
if the original gear and motors are lower efficiency
10-15%
energy savings are possible
Minimal
energy savings if variable speed is not required
Efficiency
difference between Baldor IPM motor and newer efficient installation is minimal
2% Plus or minus energy savings is
the expectation
The
primary reason is that the efficiency of the PM motors at the very low speeds of the fan is not very high,
drive losses also have to be considered
Direct Drive Savings and Comparison