I need a small air compressor for a robotics application. I currently have one of those 12V tire inflators (200 psi, 1 CFM or so) that is sized well for this purpose (sample image below).
However, in the future I would like to replace this with a lighter compressor with similar specifications (for weight savings). Most of the weight of these compressors is a large DC brushed motor (the whole big silver cylinder in the photo below), while the actual compression module is relatively small. These motors are roughly 350W peak (30A, 12V from spec sheet). Similar DC brushless motors (by wattage) are <150 grams. Certainly they might be at a higher RPM, but even with gears this would still be a lot smaller.
Is there any reason that these huge (3-4 kg) brushed motors couldn't be replaced by tiny brushless motors? If so, why can't I find such devices anywhere? It wouldn't be cost effective for these cheapo inflators (you need more complex controls for brushless), but it seems like there would be enough demand for lightweight compressors for someone to manufacture a few.