Specialized Motors iclude variety of motors like coreless motors, pancake motors, linear motors and many more
Coreless Motors- These motors have a rotor that is constructed without any iron core. The rotor can take the form of a winding-filled cylinder, or a self-supporting structure comprising only the magnet wire and the bonding material, areused widely in miniaturized applications where size is of a premium but performance is not.Owing to their light weight and lack of a iron/steel core, they can provide huge power to weight ratios and thus enhanced accelerations often reaching a mechanical time constant under one milli second.
For eg. mini/micro RC applications like quadcopters etc are a great application for coreless motors