Design and Control of A Ropeless Elevator with Linear Switched Reluctance Motor Drive Actuation Systems

Simple item page
dc.contributor.authorLim, Hong Sunen
dc.contributor.committeechairRamu, Krishnanen
dc.contributor.committeememberPrather, Carl L.en
dc.contributor.committeememberStilwell, Daniel J.en
dc.contributor.committeememberDe La Ree, Jaimeen
dc.contributor.committeememberLindner, Douglas K.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:08:36Zen
dc.date.adate2007-05-03en
dc.date.available2014-03-14T20:08:36Zen
dc.date.issued2007-03-23en
dc.date.rdate2010-05-03en
dc.date.sdate2007-03-29en
dc.description.abstractLinear switched reluctance motor (LSRM) drives are investigated and proved as an alternative actuator for vertical linear transportation applications such as a linear elevator. A one-tenth scaled prototype elevator focused on a home elevator with LSRMs is designed and extensive experimental correlation is presented for the first time. The proposed LSRM has twin stators and a set of translator poles without back-iron. The translators are placed between the two stators. The design procedures and features of the LSRM and the prototype elevator are described. The designed LSRM is validated through a finite element analysis (FEA) and experimental measurements. Furthermore, a control strategy for the prototype elevator is introduced consisting of four control loops, viz., current, force, velocity, and position feedback control loops. For force control, a novel force distribution function (FDF) is proposed and compared with conventional FDFs. A trapezoidal velocity profile is introduced to control vertical travel position smoothly during the elevator's ascent, descent, and halt operations. Conventional proportional plus integral (PI) controller is used for the current and velocity control loops and their designs are described. The proposed control strategy is dynamically simulated and experimentally correlated. Analytical and experimental results of this research prove that LSRMs are one of the strong candidates for ropeless linear elevator applications. However, the proposed FDF is assuming that the feedback current signals are ideal currents indicating actual phase currents without any measurement disturbances mainly arising from sensor noise, DC-link voltage ripple, measurement offset, and variations in the plant model. Meanwhile, real control systems in industry have measurement disturbance problems. Phase current corrupted by measurement disturbances increases torque or force ripple, acoustic noise and EMI. Therefore, this dissertation also presents a novel current control method to suppress measurement disturbances without extra hardware. The controller is based on an extended state observer (ESO) and a nonlinear P controller (NLP). The proposed method does not require an accurate mathematical model of system and can be implemented on a low-cost DSP controller. The proposed ESO is exploited to estimate the measurement disturbances on measured phase currents, and the proposed NLP compensates for the measurement disturbances estimated by the ESO. The performance of the proposed current control is validated through extensive dynamic simulations and experiments. Moreover, this rejection of measurement disturbances results in a reduction of force ripple and acoustic noise. Due to superior and robust current control performance, it is believed that the proposed method can be successfully applied into other motor drive systems to suppress measurement disturbances with the same promising results without extra hardware.en
dc.description.degreePh. D.en
dc.identifier.otheretd-03292007-133554en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03292007-133554/en
dc.identifier.urihttp://hdl.handle.net/10919/26541en
dc.publisherVirginia Techen
dc.relation.haspartHSLIM_PhD_Dissertation_Rev2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectElevatoren
dc.subjectLinear Switched Reluctance Motoren
dc.subjectNonlinear Controlleren
dc.subjectExtended State Observeren
dc.subjectDisturbance State Observeren
dc.subjectMeasurement Disturbanceen
dc.subjectEMIen
dc.subjectAcoustic Noiseen
dc.subjectForce Distribution Functionen
dc.subjectForce Controlen
dc.subjectCurrent Controlen
dc.titleDesign and Control of A Ropeless Elevator with Linear Switched Reluctance Motor Drive Actuation Systemsen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
HSLIM_PhD_Dissertation_Rev2.pdf
Size:
4.24 MB
Format:
Adobe Portable Document Format
Download

Collections

Doctoral Dissertations