Abstract: A phase analog encoding system with compensation for the phase shift error inherent in a resolver position transducer. The inherent phase shift error in a resolver position transducer is compensated independent of a resolver position in a time multiplexed fashion by periodically applying a known reference signal to the resolver and measuring the electrical phase shift across only the resolver. The newly measured value of the inherent electrical phase shift is compared with the last measured value of the inherent electrical phase shift and any deviation is calculated. This deviation is used to determine the appropriate compensation value for the inherent electrical phase shift. The compensation value is subtracted from the resolver phase shift during normal operation resulting in an output signal which is independent of the inherent electrical phase shift error in the resolver position transducer. Additionally, compensation for encoding errors is developed in a calibration mode.

Abstract: The present invention provides a high response inexpensive microprocessor based digital control system. The digital control system uses only one detector that detects only one motion characteristic of the device controlled by the system. In the preferred embodiment, the digital control system controls the field orientation, the position and the velocity of a movable member of a brushless motor by creating commands that represent the desired position of the movable member 1024 times per second. The system also provides methods for improving the accuracy and precision of the system.

Abstract: The present invention provides a high response inexpensive microprocessor based control system. The system uses only one detector that detects only one motion characteristic of the object controlled by the system. In the preferred embodiment, the system controls the position and velocity of the movable member of the motor by creating commands that represent the desired position of the movable member 1024 times per second. The system also provides methods for improving the accuracy and precision of the system.