The motor shown in the video is a "universal motor". That type of motor has brushes and are normally used in hand drills and vacuum cleaners. They operate in a similar manner to DC motors. They produce good torque and work well with adjustable voltage controls such as found in a hand drill with variable speed.
If its quoting 1.75hp then thats about 1.3kW. So I'd be looking for a 1.3kW motor that I can hook up to a speed controller. Hmmmmm
What sort of motor is best for continous high torque applications?