Mosolver - Integrated Motor and Resolver - Operational

Abstract:
The Mosolver1 is an innovative closed-loop motion actuator which infuses a position feedback sensor into the magnetic structure of a high pole count AC hybrid servo motor. The position sensor coils are strategically placed within the motor structure so as to intercept a portion of the flux used to operate the motor. The ripple current associated with the PWM drive provides the flux variation required to induce a voltage in the sense coils. When properly sampled, the sensor output provides sine and cosine information similar to a resolver, and these signals are available even when the motor is stationary. Measured resolution on the unit tested is up to 32000 increments per revolution with approximately 1.6 increments RMS of noise. The motor plus feedback sensor fit in the same volume as the motor alone, and do not require alignment.