Replacing Universal Motor with Induction Motor

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Replacing Universal Motor with Induction Motor

Post by SteveHGraham » Sat Mar 10, 2018 2:35 pm

I saw a discussion of DeWalt DW735 planers. They are very loud. Someone said the reason is that these planers have universal motors.

I have a DW735, and I don't really care about the noise, but I wondered: how hard would it be to put an AC motor in there?

Here's the problem: I have no idea how to figure out the dimensions and so on. When you buy a 1-phase or 3-phase motor, you can look up the frame and whatever and buy a motor you know will drop right in. Is there a chart somewhere that tells you which AC motor will fit in a hole left by which universal motor?

I can see why they use a universal motor. The replacement costs about fifty bucks.
Every hard-fried egg began life sunny-side up.

John Hasler
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Re: Replacing Universal Motor with Induction Motor

Post by John Hasler » Sat Mar 10, 2018 3:50 pm

There are no standard dimensions for universal motors, but they generally have higher power density and much higher operating speed (that's why they are noisy) than induction motors. I think that you would have to mount the induction motor elsewhere and use a belt.

Mr Ron
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Re: Replacing Universal Motor with Induction Motor

Post by Mr Ron » Sat Mar 31, 2018 12:53 pm

Universal motors usually are of a proprietary design and designed to fit into the tool. Just think the difference between a motor in a stand mixer and a motor in a vacuum cleaner; both universal motors, but totally non-interchangeable.
Mr.Ron from South Mississippi

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