A motor control system for a brushless and sensorless DC motor for driving a compressor, pump or other application, includes a protection and fault detection circuit for detecting a locked rotor and a rotor which has stopped because of lost rotor phase lock. The motor control system also includes an...http://www.google.ca/patents/US7042180?utm_source=gb-gplus-sharePatent US7042180 - Brushless and sensorless DC motor control system with locked and stopped rotor detection
