rockman7892
Electrical
- Apr 7, 2008
- 1,162
I have been doing a lot of research lately regarding a 1500hp 4.16kV motor used to drive a fan. The airflow through this fan is controlled by dampers.
Recently I have come across the fan curves for this particular fan. On the second attached fan curve I see that on the curve relating to the dampers 100% open, it shows a Brake Horsepower (BHP) of 1050hp.
My understanding of BHP is that this is the total hp required by the load which in this case is the fan. This does therefore not include an losses through a gearbox or any other losses in the system (due to friction etc...)Is this an correct interpertation of BHP?
If this fan is listed as a 1050 BHP, then why would we need a 1500hp motor for this application. Would this be due to the fact that there are losses in the mechanical system that would require a larger motor to account for these losses? The motor is directly coupled to the fan shaft.
Is the larger motor typically due to a reserve capacity factor as part of the design decision?
Does the larger motor size possibly have to do with starting requirements.
I'm just trying to understand for my own knowlede what throught process goes into a motor selection process when you are given the load information that I have shown attached?