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Brushless and coreless motors are different.

A coreless motor has brushes and its armature only consists of a specific pattern of windings with no iron core (hence coreless). This makes the motor extremely efficient and allows them to make them extremely small (most pager motors and smaller) Cooling becomes an issue as there's less iron in the motor. They also have absolutely no cogging, which is neat (cogging is basically the magnetic resistance when no powere is applied).

Brushless motors are kinda the reverse of a standard motor where the elctromagnets are on the outside and the permanant magnet is on the inside on the armature, thus you dont need brushes to contact the inner windings of the electromagnet. Since there are several electromagnets on the outside, they need to be fired in an exact sequence to get the armature to spin, so theres usually more then 2 simple wires and are connected to a specifc microcontroller to coordinate it (most even have feed back for the timing).

The coreless motors are really neat since they have no cogging. I have a 1/32nd scale GP9 Wada Works live diesel-electric loco and each axle is powered directly by a 12 volt faulhabor coreless motor geared 1 to 8 directly to the axle, so the loco rolls totally freely if its not powered or you go into neutral like a real loco.

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