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Electric Motor Question

Hi. I have a 500W variac (auto transformer) and I wish to purchase an electric motor that I can use the variac to regulate the speed of. Many electric motors won't slow down if you lower the voltage, instead they run at the same speed, sound quieter, and, when the voltage drops below a certain level, draw heaps more amps, but stop working. I have read on the internet that a 'shaded pole motor' will work on a variac, but what about a 4 pole motor? Any advice would be appreciated. Thanks

PS Excuse the strange product category, but I had to enter a valid product.

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  • DrSpook Nov 12, 2009

    Your variac will control the speed of a bushed motor, so long as the wattage of the motor is 500 or less. Shaded pole motors are generally low power motors, such as the type used in electric fans, and will be no good for any heavy work. Induction motors are 'brushless' motors, and can only be controlled by lowering or increasing the frequency of the power. Brushed motors are cheap if you get them second hand or reconed. Hope this is of help.

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500 WATT IS ABOUT A 1/2 HORSEPOWER MOTOR. YOU CAN BUY AN INVERTER FOR THIS PRETTY REASONABLE. IT WILL VARY THE FREQUENCY OF THE SUPPLY AND THAT WILL CONTROL THE SPEED.

Posted on Feb 27, 2009

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