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Estimation and Control of Harmonic Disturbances Due to Mass Unbalance and Sensor Runout in Three-Pole Active Magnetic Bearing

Habibollahi, Alireza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46356 (08)
  4. University: Sharif University of Technology
  5. Department: Mathematical Sciences
  6. Advisor(s): Behzad, Mehdi; Manzuri, Mohammad Taghi
  7. Abstract:
  8. Disturbances due to sensor runout and mass unbalance are the main sources of harmonic disturbances in active magnetic bearing systems. Existence of this type of the disturbance not only causes harmonic vibrations in the system but also changes the steady-state position of the axis of rotation from the geometric center of the AMB. In this research, an observer-based control method used to estimate and reject this disturbance. Proposed integral observer estimates dc and harmonic content of the sensor runout and also estimates the states of the system at the same time with good precision. Lyapunov method is used to prove asymptotic stability of the proposed observer and demonstrated that sensor runout can be completely compensated when the states of the integral adaptive observer are used for feedback stabilization. Also it is shown that the proposed technique can also attenuate the rotor displacements, when the both sensor runout and mass unbalance disturbances are applied to the system. Numerical simulation is done for different situation to demonstrate the performance of proposed algorithm against each disturbance. Experimental results are also obtained by a three-pole AMB test rig, which confirm the effectiveness of the proposed method
  9. Keywords:
  10. Magnetic Bearing ; Unbalance ; Sensor Error ; Disturbance Estimation ; Harmonic Control ; Disturbance Rejection

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