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Question:

Is it possible to add more torque to an ac electric motor?

without adding any gearing or uping on the size,wattage, etc.

Answer:

No, not really. As with any motor, you are going to get X power out for Y power in. Power in is electrical wattage, and power out is mechanical wattage (or horsepower). Electrical power is volts times amps, and mechanical power is speed times torque. You can't get more power out- increasing the torque- without more power in. The only practical way to do this would be to feed the motor more power (in the form of voltage), but that would increase your power consumption, increase your speed, and you're not likely able to get a higher AC voltage very easily.

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