silviasol said:
I could only assume a large brushless motor would make enough suction to be illegal to sell in retail vacuums. Has anyone on here built a vacuum or modded one yet?
Regular household vacuums are cheap and even available for free if you want to take the effort to repair a broken one.
In Kansas City (here), trash goes to the curb. That means people put out the trash by the curb in front of their houses for the trash trucks to pick up. This is a terrible system for trash removal because it makes for an ugly neighborhood, but it provides the opportunity for recycling appliances.
The problem with a vacuum is usually something simple, like a full bag,a clogged hose, or a broken belt. That's how I get my vacuums.
A typical US household vacuum has a
universal motor 120 V that can run on AC or DC. These motors are loud but light weight. I've always considered them the incorrect choice because of the noise. Dogs usually don't like running vacuum cleaners. This is perhaps because they produce a undesirable high frequency sound, beyond our hearing range.
If you want to plumb your house to make a vacuum system, if it's possible, I recommend doing it non-conventionally. Instead of the usual arrangement of installing tubes and a central vacuum pump, find a way of slightly pressurizing the house (maybe with a couple of window fans with the flow pointed inward), and make exit holes in the walls to attach the hoses. In that way, you never need to empty a bag. This might be the illegal suction you're worried abut.