Abstract: An optical encoder includes a controller electrically connected to an optical sensor to discriminate displacement information of a glass disc. The controller comprises a pair of analog amplifiers for amplifying quadrature periodical output signals of the optical sensor, a pair of A/D converters electrically connected to the analog amplifiers for digitalizing the output of the analog amplifiers, a pair of hysteresis comparators electrically connected to the optical sensor for performing hysteresis comparison for the output of the optical sensor, an up/down counter electrically connected to the pair of hysteresis comparators for up/down counting the output of the hysteresis comparators and a firmware unit electrically connected to the pair of A/D converters and the up/down counter for performing interpolation for the quadrature periodical output signals and counting for the hysteresis compared signals. Therefore, optical encoded result of higher resolution can be achieved.

Abstract: An AC servo system with distributed movement control is used for multiple axes control in distributed manner includes at least one drive containing a programmable movement controller to perform a customized procedure to control I/O signal of local axis or other axis. The drive can download/perform movement program through communication network, edit axis parameter and monitor the axis status. The drive can set to be master/slave axis according to practical need. The master axis drive performs multiple axes simultaneous control and sends path command to each slave axis drive. The master axis drive calculates complementary command coordinate according to the path command and the path command received by the slave axis drive, whereby the movement trace of the master/slave axis drive can satisfy the path command requirement.