Asynchronous measurement and control: a case study on motor synchronization

The synchronization between two electrical motors (master and slave) is stu died. To reduce the costs of the master-slave combination, the slave motor is mounted with a very row-resolution encoder (one pulse per revolution). S ince the position measurements are asynchronous in time, standard control a nd analysis techniques are not applicable. Two methods are proposed to deal with these cheap, low-resolution encoders: the hybrid and the asynchronous control scheme. The presented controllers are successfully tested on a rea l industrial master-multi-slave system as is used for mailing machines. (C) 1999 Elsevier Science Ltd. AII rights reserved.