00-S0613-038 ASML | SVG 859-0399-002 KOLLMORGAN ServoDisc motors

In a conventional slot-wound servomotor, the armature is constructed froma heavy, laminated ironcore wound with coils of wire. In a ServoDisc motor, the armature has no iron. Instead, it is constructed from several layers of copper conductors in a unique flat-disc configuration.Not only are the armature designs completely different, so is the shape and internal construction. In a conventional servo, the permanent magnets are mounted on the motor shell creating a radial magnetic field, perpendicular to the shaft . Because the magnet pairs are so far apart, the iron core of the armature is needed to contain and focus the lines of magnetic flux. Motors of this type are typically long, thin and heavy.In a ServoDisc motor, the magnets are mounted on the end plates creating an axial magnetic field, parallel to the shaft.This leads to a very small air gap be tween the magnets, separated only by the thickness of the disc armature – a very clean and effective design approach. Torque is created when the current flowing radially through the copper conductors interacts directly with the field of the permanent magnets . This configuration is a very efficient way of producing torque. These different approaches produce dramatically different motors .