With the advent of good ceramic and new ALNICO alloy magnets,small DC can motors were developed for computer usage. Mabuchi introduced them for use in inexpensive battery operated toys. Later NWSL marketed usable industrial versions for modelrailroding, while others followed. In general they have a higher efficiency and draw less current than open frame types, but have a lower output power to volume ratio. They range from very small to large Pittman sizes used in electric powered RC boats. A variation is the so called "flat can", which has the sides between magnet extremities flattened, which can ease fitting.
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Diagram of general contruction and flux path.
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Can motor.
