Q. What is the difference between coreless and cored servos?
A. In a standard motor like the one in the HS605 servos, there is an iron core between two permanent magnets. Around this core is the wire winding. The core generally has either 3 or 5 sections. As the core moves, these sections cause the core to hesitate slightly when it reaches a different magnetic polarity. This is called ratcheting. Because of this ratcheting, the cored servos have less start up torque and a wider dead band.
In a coreless servo, there is no iron core. There is one permanent magnet around which is a bell of wire. When electricity is supplied the bell spins around this magnet. Since there are no sections or core, there is no hesitation between poles. This gives the coreless servo better start-up torque and resolution.
