Magnetic drive and canned motor pumps are two types of sealless pumps. The difference between them is how energy is transferred to the impeller. A magnetic (mag) drive works on the principle of attraction and repulsion of two permanent magnets. A canned motor is an electric motor in which the rotor winding is encapsulated and is immersed in liquid. The rotor shaft has the impeller at its end. In the past, canned motor pumps had some features that made them technologically more developed than mag drive pumps.