Fault-tolerant control of heteropolar magnetic bearings /
Flux coupling in heteropolar magnetic bearings permits remaining active coils to assume actions of failed coils to produce force resultants identical to the un-failed actuator. A distribution matrix of voltages which consists of a redefined biasing voltage vector and two control voltage vectors can...
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1999.
|
| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=731686181&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Flux coupling in heteropolar magnetic bearings permits remaining active coils to assume actions of failed coils to produce force resultants identical to the un-failed actuator. A distribution matrix of voltages which consists of a redefined biasing voltage vector and two control voltage vectors can be optimized in a manner that reduces the peak flux density. An elegant optimization method for calculating distribution matrices by using Lagrange Multiplier is presented. The distribution matrices can also be optimized for a magnetic bearing with large path reluctantly by using weighted flux density Euclidean norm. Position stiffnesses and voltage stiffnesses are calculated for the fault-tolerant magnetic bearings. Simulations show that fault-tolerant control of the multiple poles failed magnetic bearings with a flexible rotor can be achieved with reduced load capacity. Fault tolerant control of a magnetic bearing with grouped currents is developed. Hardware requirements for the fault tolerant control can be considerably reduced by using this control scheme with grouped currents. |
|---|---|
| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xxi, 149 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 138-139). |