AC (alternate current) servo motor based on position feedback structure

Abstract

The invention provides an AC servo motor based on a position feedback structure. According to the AC servo motor based on the position feedback structure, a motor shaft is directly connected with the screw of a machine table workbench to drive the screw of the machine tool workbench to move; a speed and position detecting device is coaxially connected with the AC servo motor and composed of a speed detector and a position detector, wherein the position detector can directly detect the angular displacement of rotation of the motor shaft of the AC servo motor; the detecting signals of the speed detector is fed back to a speed servo mechanism through a speed feedback device; the detecting signals of the position detector are fed back to a position adjusting mechanism. The AC servo motor based on the position feedback structure also comprises an error detecting device, which is used for detecting the practical displacement of the machine tool workbench and sending the detecting signals to an error compensating device connected with a memory and a numerical control machine tool; error compensation values are prestored inside the memory; the numerical control machine tool corrects control instructions according to the practical displacement and the error compensation values to reduce actual position errors.

Description

technical field [0001] The invention relates to an AC servo motor based on a position feedback structure and belongs to the field of control and adjustment systems. Background technique [0002] As an automatic control system with sufficient position control accuracy, position tracking accuracy and fast enough tracking speed, the position servo system has been widely used in many high-tech fields, such as laser processing, robots, CNC machine tools, large-scale Integrated circuit manufacturing, office automation equipment, radar and various military weapon tunnel systems and flexible manufacturing systems, etc. The position servo system includes two major components, the mechanical actuator and the electrical automatic control. For example, the mechanical actuator of the feed drive position servo system of a CNC machine tool often includes a worktable or tool holder, ball screw, guide rail and reduction gear, etc., and the electrical automatic control part includes AC or DC...

AI Technical Summary

Problems solved by technology

[0007] The traditional AC servo motor has the problem of unstable speed, which is easy to affect the machining accuracy, and also causes the wear of the transmission device to be accelerated, and the position positioning is not accurate enough to meet the positioning accuracy

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