| US 7,525,263 B2 | ||
| Control system | ||
| Kazunari Aoyama, Yamanashi (Japan); Minoru Nakamura, Fujiyoshida (Japan); and Takaaki Komatsu, Yamanashi (Japan) | ||
| Assigned to Fanuc Ltd, Yamanashi (Japan) | ||
| Filed on Feb. 07, 2007, as Appl. No. 11/703,239. | ||
| Claims priority of application No. 2006-036847 (JP), filed on Feb. 14, 2006. | ||
| Prior Publication US 2007/0188116 A1, Aug. 16, 2007 | ||
| Int. Cl. H02P 5/46 (2006.01) | ||
| U.S. Cl. 318—77 [318/34; 318/66; 318/68] | 5 Claims |
| 1. A control system, comprising:
one controller serving as a master unit; and
at least one controller serving as a slave unit, connected to the one controller serving as a master unit by a communication
path; and
a plurality of motors synchronously controlled by the one controller serving as a master unit and the at least one controller
serving as a slave unit,
wherein the master unit and the slave unit each comprise cycle signal generators for generating timing signals,
the slave unit comprises correction amount generation means for receiving the timing signal generated by the cycle signal
generator of the master unit, determining a phase difference and a cycle difference between the received timing signal and
the timing signal generated by the cycle signal generator of the slave unit, and determining, based on the determined phase
difference and cycle difference, a correction amount that allows the timing signal on the slave unit side to follow the timing
signal on the master unit side, and
the cycle signal generator of the slave unit corrects a generation cycle of timing signal, based on the correction amount
determined by the correction amount generation means, and outputs the corrected generation cycle of timing signal.
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