Brushless motor
From RC Helicopter Wiki
A type of electric motor that employs a stationary armature around (or within) which the magnets move. Since the power wires connect to the stationary portion of the motor, brushes are not required, and no friction or drag is thus induced by them. Brushless motors generally last longer than brushed motors, and give better performance. A brushless motor typically has three power leads, where a brushed motor will have only two. A brushless motor is controlled by sending a chain of pulses or the appropriate timing to the motor from a special brushless electronic speed controller.
The speed at which a brushless motor can rotate for a given battery voltage is known as it's KV rating. By varying the motor's pinion, motors with a range of KV ratings can be used in a given helicopter.
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