Gas magnetic bearing electric spindle and control system thereof

Abstract

The invention discloses a gas magnetic bearing electric spindle and a control system thereof. The gas magnetic bearing electric spindle structurally comprises a radial-axial auxiliary bearing, a radial displacement sensor, a radial displacement sensor bracket, a radial hybrid magnetic bearing, a limiting sleeve, a high-speed motor, a steel cylinder, an axial thrust gas bearing, a radial auxiliary bearing, a rotating shaft, a front end cover and a rear end cover. For the spindle with the novel structure, the invention provides a fuzzy control system of the gas magnetic bearing electric spindle based on a rough set theory method. The fuzzy control system comprises a controller, a power amplification module, a prototype body and a displacement detection module. Compared with a conventional fuzzy control system, the control system introduces a fuzzy control method of a rough set theory, simplifies original fuzzy control rules, and can effectively remove redundant information knowledge, so that the control system is more simple and easier to control, the dynamic performance of a spindle system is improved, and the performance of the control system can be effectively enhanced.

Description

technical field

[0001] The invention belongs to the field of mechanical manufacturing and control technology, and in particular relates to a gas magnetic bearing electric spindle and a fuzzy control system design based on a rough set theory method for the spindle. Background technique

[0002] With the development of science and technology, ultra-precision machining has become one of the key technologies for success in international competition. The first condition for realizing ultra-precision machining is ultra-precision CNC machine tools. The core factor affecting the accuracy of ultra-precision machine tools is the rotation accuracy of the spindle. The key to achieving extremely high rotation accuracy, smooth rotation, and no vibration lies in the structure of the precision spindle used and the design of the control system of the spindle.

[0003] The magnetic bearings of the existing gas magnetic bearing spindles all use active magnetic bearings (such as the publication...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the spindle of the present invention includes a radial-axial auxiliary bearing 1, a radial displacement sensor 2, a radial displacement sensor bracket 3, a radial hybrid magnetic bearing 4, a limit sleeve 5, a high-speed motor 6, and a steel cylinder 7 , radial gas bearing 8, axial thrust gas bearing 9, radial auxiliary bearing 10, rotating shaft 11, front end cover 12 and rear end cover 13, wherein, radial-axial auxiliary bearing 1 adopts angular contact ball bearing; The auxiliary bearing 10 adopts a cylindrical roller bearing; the radial displacement sensor 2 adopts an eddy current sensor and is installed on the radial displacement sensor support 3; the radial hybrid magnetic bearing 4 is a four-pole structure magnetic bearing, and its bias flux is controlled by the shaft The magnetized permanent magnet is generate...

technical field

[0001] The invention belongs to the field of mechanical manufacturing and control technology, and in particular relates to a gas magnetic bearing electric spindle and a fuzzy control system design based on a rough set theory method for the spindle. Background technique

[0002] With the development of science and technology, ultra-precision machining has become one of the key technologies for success in international competition. The first condition for realizing ultra-precision machining is ultra-precision CNC machine tools. The core factor affecting the accuracy of ultra-precision machine tools is the rotation accuracy of the spindle. The key to achieving extremely high rotation accuracy, smooth rotation, and no vibration lies in the structure of the precision spindle used and the design of the control system of the spindle.

[0003] The magnetic bearings of the existing gas magnetic bearing spindles all use active magnetic bearings (such as the publication...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the spindle of the present invention includes a radial-axial auxiliary bearing 1, a radial displacement sensor 2, a radial displacement sensor bracket 3, a radial hybrid magnetic bearing 4, a limit sleeve 5, a high-speed motor 6, and a steel cylinder 7 , radial gas bearing 8, axial thrust gas bearing 9, radial auxiliary bearing 10, rotating shaft 11, front end cover 12 and rear end cover 13, wherein, radial-axial auxiliary bearing 1 adopts angular contact ball bearing; The auxiliary bearing 10 adopts a cylindrical roller bearing; the radial displacement sensor 2 adopts an eddy current sensor and is installed on the radial displacement sensor support 3; the radial hybrid magnetic bearing 4 is a four-pole structure magnetic bearing, and its bias flux is controlled by the shaft The magnetized permanent magnet is generate...

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