Servo Motor, DC Brusheless-Type

The brushless servo motor uses a rotor with magnets, and the windings on the stator, or stationary part of the motor. This type of motor does not have a commutator, so in order to switch windings to keep it going, electronic commutation is used. This entails a sensor (encoder or resolver) on the motor that lets the amplifier know where the rotor is, and which winding should be switched on. This type offers reduced inertia, which results in better response and elimination of brush and commutator maintenance as well as more ability to handle more peak power and provide zero speed holding torque on a continuous basis.