A circumferential segmented radial hybrid support electromagnetic bearing system and control method

Abstract

The present invention proposes a circumferential segmented radial hybrid support electromagnetic bearing system and its control method. The system structure includes three electromagnetic bearings, a position sensor, three bearing bushes and a pressure sensor; Each of the electromagnetic bearings is equipped with a position sensor. The three bearing pads are evenly distributed along the circumferential direction of the shaft with a difference of 120 degrees. The bearing pads and electromagnetic bearings are interlaced. A pressure sensor is configured; the bearing bush and the rotor maintain a certain air gap, and the electromagnetic bearing and the rotor maintain a certain air gap. The electromagnetic bearing system and control method of the present invention can not only realize radial mechanical support, so that the rotor will not deviate too much, but also can obtain the radial load force and offset position caused by the rotor deviation at the same time, from the perspective of control Improve responsiveness.

Description

technical field [0001] The invention belongs to the technical field of magnetic suspension bearings, and in particular relates to a circumferential segmented radial hybrid support electromagnetic bearing system and a control method. Background technique [0002] Generally speaking, soft magnetic materials have magnetic saturation characteristics, the degree of saturation is limited, and the stiffness is low compared with mechanical bearings. Usually, the optimization of magnetic bearing system includes two aspects of structure and control. Structural optimization ideas focus on multi-degree-of-freedom bearings, from the initial combination of single axial and dual radial bearings to an axial-radial and radial combination or a dual-axial-radial combination. Considering that the integrated multi-degree-of-freedom combination system has a high degree of uncontrollable coupling, which increases the difficulty of control and maintenance, it is not widely used. At the control le...

AI Technical Summary

Problems solved by technology

Considering that the integrated multi-degree-of-freedom combination system has a high degree of uncontrollable coupling, which increases the difficulty of control and maintenance, it is not widely used.

At the control level, the closed-loop method of rotor position offset signal feedback is generally used to control the winding current. Once the rotor suffers from excessive interference and sudden changes, it is easy to touch the radial limit position.

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