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Robust control method and system for directly driving numerical control platform based on coordinate transformation and parameter adjustment

A technology of parameter adjustment and coordinate transformation, which is applied in the field of numerical control and can solve problems such as contour errors

Inactive Publication Date: 2014-02-26
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Although this method provides control system stability for any profile curve, the difference between the actual profile error and the quadrature error components can lead to a significant profile error

Method used

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  • Robust control method and system for directly driving numerical control platform based on coordinate transformation and parameter adjustment
  • Robust control method and system for directly driving numerical control platform based on coordinate transformation and parameter adjustment
  • Robust control method and system for directly driving numerical control platform based on coordinate transformation and parameter adjustment

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the drawings.

[0068] The invention is applied to an X-Y numerical control platform of a linear drive motor, the position of the platform is connected to the linear encoder of each drive shaft, and the sensor resolution of the linear encoder is 0.1 micron. The speed of each drive shaft is calculated by the reverse difference of the position measurement. The sampling period is 2 milliseconds.

[0069] (1) System hardware structure

[0070] Based on coordinate transformation and parameter adjustment, the robust control system for directly driving the CNC platform includes voltage adjustment circuit, rectifier filter unit, IPM inverter unit, DSP, Hall sensor, grating ruler, current sampling circuit, position sampling circuit, IPM isolation drive protection circuit . The structure of the system is like image 3 As shown, the voltage regulation circuit adopts the reverse voltage regulation module EUV-25A-I...

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Abstract

A robust control method for directly driving a numerical control platform based on coordinate transformation and parameter adjustment includes the steps: firstly, determining the initial phase of a motor rotor; secondly, performing coordinate transformation and parameter adjustment for contour errors to obtain position errors, namely calculating positional deviation and judging whether to adjust positions or not; and finally, executing robust control algorithm, outputting control quantity and driving the numerical control platform. A control system used in the method comprises a voltage regulation circuit, a rectifier filter unit, an IPM (intelligent power module) inverter unit, a DSP (digital signal processor), a Hall sensor, a grating bar, a current sampling circuit, a positioning sampling circuit and an IPM isolation driving protection circuit. A robust contour controller is used for directly driving the numerical control platform. Based on a complete coordinate transformation and parameter adjustment function, the robust contour controller can be applied to any smooth contour curves, device modeling errors and interference are avoided, and stability of the robust control system is improved.

Description

Technical field [0001] The invention belongs to the technical field of numerical control, and relates to a robust control method for a direct drive numerical control platform based on coordinate transformation and parameter adjustment. Background technique [0002] CNC machine tools are developing in the direction of precision, high speed, compound, intelligence and environmental protection. Precision and high-speed machining put forward higher requirements for transmission and control, higher dynamic characteristics and control accuracy, higher feed speed and acceleration, lower vibration noise and less wear. The direct drive feed system takes advantage of the linear motor's ability to directly generate linear thrust, and the system composition no longer needs intermediate transmission links such as screw nut mechanism. The application of the linear motor and its drive control technology in the feed drive of the machine tool has caused major changes in the transmission structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
Inventor 王丽梅郑浩赵希梅孙宜标刘春芳
Owner SHENYANG POLYTECHNIC UNIV
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