US Patent No. 10,228,676

SERVO CONTROL DEVICE


Patent No. 10,228,676
Issue Date March 12, 2019
Title Servo Control Device
Inventorship Kouichi Etou, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 10,228,676

1. A servo control device that performs speed control or torque control for controlling speed or torque based on a speed command or a torque command by an analogue input voltage, and performs positional control for controlling a position of a servo motor based on feedback from the servo motor, the servo control device comprising:a command switching unit determining that a command voltage of a command by the analogue input voltage enters a dead zone of the command voltage which is registered in advance and determined as stopping, wherein,
when detecting that the command voltage enters the dead zone, the command switching unit ceases the speed control or the torque control, and switches, while the servo motor is ON, a control method of the servo motor for causing the servo motor to perform deceleration stop by the positional control by distribution processing of a movement command regarding an actual speed when the speed control or the torque control is ceased as an initial speed.