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Fifty to Sixty Hertz Motor Effect
Machinery built for a 50 hertz grid gets shipped to plants running at 60 hertz, and the arithmetic of what changes is not a matter of opinion. Enter a motor and read the synchronous speed at each frequency, the speed change, and the torque consequence of running at the same voltage.
Two, four or six poles covers most small drives.
Enter a motor and press calculate.
What the arithmetic does and does not settle
| Question | What the calculation answers |
|---|---|
| Does the motor survive? | Yes. Run at the same voltage on a higher frequency, an induction motor keeps its rated output and rated current. It does not burn out. |
| Does anything change? | Speed does, unavoidably, by the ratio of the two frequencies. Torque falls by roughly the inverse of that ratio when voltage is unchanged. |
| Can it be avoided? | A motor fed through a variable frequency drive is insulated from the supply frequency: the drive takes the grid it is given and synthesises the output frequency the motor needs. |
| Does a transformer fix it? | No. A transformer changes voltage only. Frequency passes straight through it. |
| What does this NOT tell you? | Whether a speed change alters the finished cartridge. Winding speed and traverse ratio set the yarn lay, so ask the manufacturer directly what a destination-frequency build changes about the wound result. Do not assume it changes nothing, and do not assume it changes the micron rating. |
