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Formulae
Rotational Speed
In the formula below, the "Poles" refer to the
"Electrical Poles" that are wound into the electric motor when it is
manufactured. This is a set value and, aside from "redesigning and
rewinding" the motor, is basically a non-changeable number. Therefore, from
a "law of physics" stand-point, the only thing that will change the speed of
an electric motor is changing the "Frequency". This is where the AC
Drive comes into the picture. This calculated value for speed is known as the "Synchronous
Speed".
|
|
120 x Frequency |
| Synchronous RPM |
= |
|
|
|
Poles |
Slip
|
|
Synchronous RPM - Full Load RPM |
X 100 |
| Percent Slip |
= |
|
|
|
Synchronous RPM |
Torque
|
|
5250 x HP |
| Torque (lb-ft) |
= |
|
|
|
RPM |
|
|
63000 x HP |
| Torque (lb-in) |
= |
|
|
|
RPM |
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