For the purpose of a demo, we want to build a small (goods) elevator that has the following requirements

• 12V : for the sake of safety
• No gear, for the purpose of the demo
• Low to medium speed: 30~800 RPM (may have high acceleration - sake of demo)
• High torque, able to lift heavy things (say > 0.5 Nm)
• Quiet, will run permanently

We made a prototype with a stepping motor, which was great, but the problem with such a motor, is that at higher speed (say 300 RPM), heavy loaded, the motor may sometimes "miss" a step, and in this case just get stuck (and vibrate instead of rotating).

So the solution seems to be a brushless motor (sloted?), with a proper controller.