For some reason, you've found yourself in a position where you need to purchase a large electric motor -- as in a motor that is not a standard "NEMA" electric motor. It may be that some new equipment is being installed at your location, you may be in search of a surplus motor, or the time has come to replace one. Regardless of why you need a large electric motor, there are some key things to keep in mind. But first, let's define what we mean by large.
Large Electric Motors
These are not your everyday, on-the-shelf motors that every PT (Power Train) house and motor shop has in stock.
The kind of motors under discussion here are typically built specifically for your application and although some large motors may provide hundreds of horsepower (400+ hp), the kind I'm talking provide thousands of horsepower. These are typically referred to Above-NEMA or A-NEMA motors and they can be far more challenging to purchase than a standard motor.
The Basics of Bidding Out an ANEMA Motor
First, start with the basics which include information such as ...
- Full load amps
- Bearing type
- NEMA design
- KVA code
- and quite a few more!
You also want to include any other information you have about the original motor and its application. This can include frame dimensions, speed vs. torque curves, data packets, and schematics.