Patent ID: 8344678

Claim:
A servomotor control system comprising: an integrated control unit for integrally controlling a plurality of servomotors; and a plurality of servomotor units, each of which is coupled with the integrated control unit via a communication network, and coupled with a corresponding servomotor, wherein each servomotor unit includes: a motor driver for driving the servomotor; a rotation detector for detecting rotation of the servomotor; an original point detector for detecting an original point of the servomotor; a communication element for obtaining control information including rotation position instruction information from the integrated control unit; a rotation position calculator for obtaining a rotation detection signal from the rotation detector and for calculating a current rotation position of the servomotor based on the rotation detection signal; a motor drive instruction element for obtaining the control information from the communication element and for outputting driving instruction information to the motor driver according to the control information including the rotation position instruction information and the current rotation position; and a current rotation position correction element for resetting the current rotation position calculated by the rotation position calculator to be a predetermined original point without using the control information when the original point detector detects the original point; wherein the integrated control unit selects one of a normal mode and an initialization mode as an operation mode of the servomotor, wherein the motor drive instruction element outputs a drive stop instruction to the motor driver when the current rotation position correction element resets the current rotation position in a case where the integrated control unit selects the initialization mode, and wherein the motor drive instruction element does not output the drive stop instruction to the motor driver so that the servomotor continues to rotate, and the current rotation position correction element resets the current rotation position to be the predetermined original point when the original point detector detects the original point, in a case where the current rotation position correction element resets the current rotation position, and the integrated control unit selects the normal mode.