Nonlinear Feedback Control of a Bearingless Brushless DC Motor

Grabner, Herbert; Amrhein, Wolfgang; Silber, Siegfried; Gruber, Wolfgang

doi:10.1109/tmech.2009.2014058

Cited by 84 publications

(32 citation statements)

References 10 publications

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“…• the rotor and stator are somehow mechanically displaced from each other and a device (such as a load cell) is used to measure the force along that direction for various displacements [3], [6], [7], [10], [13]- [15];…”

Section: B Measurement Techniquesmentioning

confidence: 99%

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Severson

Røkke

Nilssen

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-The design and construction of a permanent magnet thrust bearing for a bearingless motor is presented and a measurement technique is proposed to characterize the bearing. Optimal design of a bearingless motor requires the machine designer to be aware of the axial bearing's performance under simultaneous axial and radial displacement. A simple, low-cost test setup which requires only two single-axis load cells is proposed and evaluated to make these measurements on the magnetic bearing stator. The measurement data are found to be in reasonable agreement with finite element calculations and to satisfy Earnshaw's theorem, where the sum of stiffnesses in the three axes must be zero. The measurement technique displayed good test-retest reliability, with repeated radial force data having an average standard deviation of 2.1% for radial displacements greater than 0.5 mm and axial force data having a typical error of 0.9%.

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Section: B Measurement Techniquesmentioning

confidence: 99%

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Severson

Røkke

Nilssen

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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show abstract

“…m π τ = (4) Thus, (3) and (4) allow the calculation of the overall motors bearing forces and torque from the knowledge of the force and torque generation of only one single stator element [5].…”

Section: B Generation Of Bearing Forces and Motor Torquementioning

confidence: 99%

Design variants of the bearingless segment motor

et al. 2010

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Bearingless drives and magnetic bearings allow the construction of contactless, wearless and lubrication-free rotating systems. Utilizing a permanent magnet excited rotor disc permits the passive stabilization of three degrees of freedom (tilting and axial deflection) by reluctance forces. Hence, using these bearingless slice motors it becomes possible to design very compact magnetically suspended drive systems. The bearingless segment motor is a subtype of the bearingless slice motor, where the stator consists of single elements. As a matter of fact, all these stator segments are magnetically decoupled from each other. This article introduces different designs of the announced bearingless segment motor featuring different rotor and stator compositions. Especially the differences in the generation of bearing forces are outlined. The special features of the various considered drives are examined and their advantages and drawbacks are discussed. Finally these motors are compared qualitatively by different criteria (like the demands on power electronics, passive stiffnesses or bearing force and motor torque capacity).

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“…The hybrid controller acts as a FLC when the error in speed is large and gives better transient performance. The controller shifts to a PI when speed error is less and able to enhance steady-state performance [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Fuzzy PI Speed Controller for Brushless DC Motor Drives

Kommula¹,

Kota²

2016

Appl. Theory Comput. Technol.

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Abstract:In future, Electric vehicles (EV) are trend setters for transportation with zero greenhouse gas emission and higher efficiency. In EV applications, Brushless DC motors (BLDCM) are most predominantly used. Here, a Hybrid Fuzzy PI controller is intended for effective speed regulation of BLDCM. In general, Fuzzy logic controllers (FLC) provide better transient performance and results steady state error. The PI speed controller gives good steady state performance but poor transient performance. For getting an excellent performance, the referred Hybrid fuzzy PI controller combines the merits of the above two controllers. Also, this paper presents relative study among PI, FLC and Hybrid Fuzzy PI controller for a BLDCM. In Matlab/Simulink environment, the BLDCM with proposed controller is designed and simulated. Results prove the predominance of intended Hybrid Fuzzy PI for BLDC motors.

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Nonlinear Feedback Control of a Bearingless Brushless DC Motor

Cited by 84 publications

References 10 publications

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Design variants of the bearingless segment motor

Hybrid Fuzzy PI Speed Controller for Brushless DC Motor Drives

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