Advances in motor and feedback technology, such as encoders and resolvers, usually proceed along at an incremental pace (pardon the pun). So-called integrated servomotors have had built-in encoders for quite some time. But a new servo motion actuator integrates a resolver into the structure of a high pole count AC motor. 
The Mosolver™ from Quicksilver Controls is a combination motor and resolver in the same footprint as the motor alone. It’s said to enable compact, inexpensive, and robust closed-loop motion control. The Mosolver eliminates the need for an external feedback device as the resolver function is combined with the motor to allow for both commutation and position sensing.
It works by having sense coils within the motor determine the rotor position. The voltages induced in these small sense coils are a result of a combination of the PWM current ripple and flux steering that occurs from the interaction of the rotor and the stator magnetics.
Eliminating a separate feedback device is said to reduce cost and size, eliminate alignment issues, and improve system ruggedness.
For more information, visit www.quicksilvercontrols.com.
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