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Radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation

A technology of magnetic suspension bearing and fault-tolerant control, which is applied in the direction of holding devices and electrical components using magnetic attraction or thrust, and can solve problems such as failure of active magnetic suspension bearings.

Inactive Publication Date: 2010-01-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The failure of any link will lead to the failure of the active magnetic bearing

Method used

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  • Radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation
  • Radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation
  • Radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Embodiment 1: as image 3 shown. The following takes a single excitation coil fault as an example to illustrate. There are six modes for a single coil fault, but from the perspective of the structure of the stator, these six faults all cause the magnetomotive force of a certain magnetic pole of the stator to be zero. image 3 (b), image 3 (c), image 3 (d), image 3 (e), image 3 The stator in (f) rotates 60°, 120°, 180°, 240°, 300° clockwise respectively, then these five faults become and image 3 (a) Exactly the same failure pattern. The essence of these six fault forms is exactly the same, and can be attributed to one type of fault.

Embodiment 2

[0093] Embodiment 2: as Figure 4 shown. There are three modes for two symmetrical field coil failures. if will Figure 4 (b), Figure 4 The stator in (c) rotates 60° and 120° clockwise respectively, then both faults become and Figure 4 (a) Exactly the same failure pattern. The essence of these three fault forms is exactly the same and can be attributed to one type of fault.

Embodiment 3

[0094] Embodiment 3: as Figure 5 shown. There are two modes of failure of the three alternating field coils. if will Figure 5 The stator in (b) rotates 60° clockwise, then the fault becomes and Figure 5 (a) Exactly the same failure pattern. The essence of these two types of faults is exactly the same, and can be attributed to one type of fault.

[0095] (2) Secondly, it is necessary to select any one of the fault forms for the same type of fault and use the bias current linearization theory to solve a current distribution matrix. Hypothetically for image 3 In the case of coil 1 failure shown in (a), a current distribution matrix W can be obtained by using the bias current linearization method 1 , to realize the decoupling and linearization control of x-direction and y-direction control. which is

[0096] i c 1 ...

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PUM

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Abstract

The invention discloses a radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation, belonging to an active magnetic suspension bearing fault tolerant control method; the control method comprises the following steps: firstly, radial active magnetic suspension bearing faults are classified according to the structure of a radial active magnetic suspension bearing, and the faults having the same effect on a stator magnetic circuit is defined into the same kind; secondly, aiming at each kind of the radial active magnetic suspension bearing faults, one condition is chosen, current allocation matrix is obtained by adopting bias current linearization theory; thirdly, the current allocation matrix is adopted, the radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation is adopted to realize the fault tolerant control of the faults with the same kind. The method reduces the number of current allocation matrixes needed to be solved in the radial active magnetic suspension bearing fault tolerant control.

Description

technical field [0001] The invention relates to a coordinate transformation-based fault-tolerant control method for a radial active magnetic suspension bearing, and belongs to the technical field of radial active magnetic suspension bearing control. Background technique [0002] The active magnetic suspension bearing is a new type of bearing that realizes the stable support of the rotor through the controllable electromagnetic force. Its main feature is that through a closed-loop control system, the rotor is stably suspended in the center of the stator magnetic poles under the action of the stator magnetic force, so that there is no contact between the rotor and the stator, and thus no lubrication, no sealing, high-speed rotation, and It has the advantages of working under extreme temperature conditions and vacuum environment, and its support stiffness and damping are controllable. Using this advantage, the rotor can avoid the critical speed within the operating speed range ...

Claims

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Application Information

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IPC IPC(8): H02N15/00
Inventor 徐龙祥崔东辉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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