A pulse type numerical control device and method

Abstract

The invention relates to a method for position control of a servo motor in the field of numerically-controlled machine tools, and particularly relates to a method for controlling a servo motor by using pulse output. An operation station is connected to a CPU unit through an operation station interface circuit. A keyboard is connected to the CPU unit through a keyboard interface circuit. A liquid crystal display is connected to the CPU unit. One end of an FPGA module is connected to the CPU unit, and the other end of the FPGA module is connected to a servo driver through a pulse interface circuit and an encoder interface circuit. An I / O interface circuit is connected to the FPGA module. The FPGA module includes a GPMC interface module, an I / O module, a pulse generation module, and an encoder signal processing module. The GPMC interface module is connected to the CPU module, and receives command information of the CPU module. An adaptive function is achieved, and the system cost is saved.

Description

technical field [0001] The invention relates to a method for controlling a servo motor using a position type in the field of numerically controlled machine tools, in particular to a method for controlling a servo motor using a pulse type output. Background technique [0002] With the technical progress of high-speed DSP devices and the continuous reduction of costs, digital servo has become the mainstream of the industry. The control method of the traditional numerical control device to the servo driver adopts the speed value output of the analog quantity to control. The position loop control is completed by the numerical control device, but the effect of this control method is not very ideal for high-speed woodworking processing of small line segments. So now the mainstream approach is to use the DSP of the servo driver to complete the position loop control. [0003] The current servo drives generally provide two control methods, analog control and pulse control. The tech...

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Problems solved by technology

[0003] The current servo drives generally provide two control methods: analog control and pulse control. The technical difficulty of using pulse control is that the underlying hardware cannot have a certain degree of periodical jitter because the numerical control device using pulse does not participate in position loop control. Correction function, the pulse output cannot meet the condition of a duty ratio of 1:1, and the smooth operation of the motor cannot be guaranteed.

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