A microprocessor‐based phase‐locked servo system using the slope‐varied digital‐pump technique

A microprocessor‐based slope‐varied digital‐pumped controller (μP‐SVDPC) for improving the system locking performance of digital‐pumped phase‐locked servo system (DPPLS) is presented. The need for characterizing the μP‐DPPLS to have an nearly equal speed acquisition time is based on a family of slope‐varied transfer curves installed in the μP‐SVDPC. No prescribed speed motion profile is required for guiding the motor served in a wide control range. The speed motion profile in μP‐SVDPC is adaptively created according to the amount of the frequency error formed by the phase/frequency detector. A design example for one‐dimensional speed servo is examined step by step. Computer simulations and experiments in comparison with those of the DPPLS show that the speed acquisition times of the μP‐DPPLS for the small and the large speed‐change commands are improved by nearly 14% and 80%, respectively.