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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.

Research, Knowledge and Information :

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