Disc motors are permanent-magnet stepping motors that exhibit performance comparable to that of hybrid motors. Rotors in disc motors are thin (typically less than 1-mm) discs, unlike the cylindrical ...

You can't escape friction. The force that resists motion between two objects that are in contact with one another exhibits itself all over the place: in between your engine's rod bearings and its ...

The advantages of disc brakes are well known to serious four-wheelers. Although discs have lessarea than comparable-application drums, they work better when hot and wet. Plus, discs are easier to ...