Brushless inrunners are very similar from the outside to a brushed DC motor in terms of size. They are usually mounted on a circuit board like a servo motor with a gear box. They spin very fast and have to be geared down like a brushed dc motor. They are different than a brushed dc motor in that they are stronger, more efficient and last longer. They can be matched to a wider variety of propellers or loads by adjusting the gearing.
Bipolar motors have a single winding per phase. The current in a winding needs to be reversed in order to reverse a magnetic pole, so the driving circuit must be more complicated, typically with an H-bridge arrangement "however there are several off-the-shelf driver chips available to make this a simple affair". There are two leads per phase, none are common.Static friction effects using an H-bridge have been observed with certain drive topologies.
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