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Dual Voltage Motor


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Hello johnny


Welcome to the forum.


If you run an induction motor on less than it's design voltage, the flux in the iron wil be low. This will reduce the maximum torque available and increase the slip at any given shaft power. If you operate at moderate to high shaft load, the increased slip will increase the slip losses in therotor and can result in rotor failure.

The start current will be reduced by the voltage reductioon and the start torque will be reduced by the square of the voltage reduction.

At half voltage, the start current will be halved and the start torque will be a quarter.

Provided that you operate the motor at very light loads, there will not be an issue. Effectively, you have reduced the motor rating.


Best regards,

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I might also point out that 115 and 230V implies 1 phase operation. It then follows that a 1 phase motor may have a centrifugal switch for capacitor or split phase starting. If then, as Marke mentioned, the load is such that the motor cannot accelerate fully because of a lack of sufficient torque, the centrifugal switch will not operate and the capacitors and/or switch will fail more quickly than the rotor. Same net result however. A symptom called "Lackarotate"!
"He's not dead, he's just pinin' for the fjords!"
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