Electric Motors ----How Efficiency are they?

crash_uni8 · February 05, 2008, 10:23:51 PM

Title says it all, how efficient are the current electric motors today?

and if the efficiency goes up does it mean that less power is used or more torque is put out (with the same power usage)?

Schpankme · February 05, 2008, 10:42:34 PM

Quote from: crash_uni8 on February 05, 2008, 10:23:51 PM
... how efficient are the current electric motors today?

NEMA Design B Electrical Motors

Electrical motors constructed according NEMA Design B must meet the efficiencies below:

Power(hp)    Minimum Nominal Efficiency*
1 - 4      78.8
5 - 9      84.0
10 - 19      85.5
20 - 49      88.5
50 - 99      90.2
100 - 124      91.7
> 125      92.4

*NEMA Design B, Single Speed 1200, 1800, 3600 RPM. Open Drip Proof (ODP) or Totally Enclosed Fan Cooled (TEFC) motors 1 hp and larger that operate more than 500 hours per year. ref: The Engineering ToolBox 2005

- Schpankme