Servo motion actuator combines motor and resolver in the same footprint as the motor
Quicksilver Controls introduced a servo motion actuator that infuses a position feedback sensor into the very structure of a high pole count AC motor. The Mosolver is a combination motor and resolver in the same footprint as the motor alone, enabling compact, inexpensive, and robust closed loop motion control. The encoder is no longer needed, and the resolver function is combined with the motor to allow both for commutation and position sensing. Sense coils have been added within the motor, allowing the rotor position to be determined. The voltages induced in these small sense coils result from a combination of the PWM current ripple and flux steering which occur by the interaction of the rotor and the stator magnetics.
Quicksilver Controls, www.quicksilvercontrols.com