3 wires. Brushless motors are more expensive than dc brushed motors. Lots of PC fans are brushless motors. The motor that drives the paper path in laser printers is brushless. They are build differently than servo or brushed motors. There are no places where metal is rubbing against metal. Brushless motors will last longer, spin faster, help batteries last longer. They have three wires instead of two. There are two types: inrunner and outrunner.
Servo motors are usually mounted on a circuit board. Some have two wires traveling to the circuit board much like between a DC motor and ESC. Attached to the board are wires for motor power and again three wires going to the arduino, the same three wires mentioned above.
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