US Patent No. 9,321,178

MACHINE SYSTEM INCLUDING WIRELESS SENSOR


Patent No. 9,321,178
Issue Date April 26, 2016
Title Machine System Including Wireless Sensor
Inventorship Ya Cho, Yamanashi (JP)
Kaimeng Wang, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,321,178

1. A machine system comprising:
a machine device including a movable member driven by a motor;
a control device configured to control the machine device;
a sensor unit provided at a tip part of the movable member and configured to periodically detect a position, a speed or acceleration
of the tip part;

a wireless signal path through which a sensor signal indicating the position, the speed or the acceleration detected by the
sensor unit is transmitted from the machine device to the control device by wireless;

a data acquisition unit configured to acquire first time-series data of the position, the speed or the acceleration at the
tip part of the movable member corresponding to the sensor signal received via the wireless signal path;

a data calculation unit configured to calculate, based on a driving command of the motor, second time-series data of the position,
the speed or the acceleration at the tip part of the movable member corresponding to the first time-series data;

a delay time calculation unit configured to calculate a delay time of the first time-series data with respect to the second
time-series data according to a degree of correlation between first time-series data acquired by the data acquisition unit
and the second time-series data calculated by the data calculation unit; and

a correction unit configured to correct the first time-series data based on the delay time calculated by the delay time calculation
unit.