Title:
Performance limits of linear variable reluctance motors in controlled linear motion applications

dc.contributor.advisor Taylor, David G.
dc.contributor.author Ahmed, Raga
dc.contributor.committeeMember Harley, Ronald G.
dc.contributor.committeeMember Habetler, Thomas G.
dc.contributor.committeeMember Meliopoulos, A. P. Sakis
dc.contributor.committeeMember Sadegh, Nader
dc.contributor.department Electrical and Computer Engineering
dc.date.accessioned 2014-01-13T16:48:02Z
dc.date.available 2014-01-13T16:48:02Z
dc.date.created 2013-12
dc.date.issued 2013-10-28
dc.date.submitted December 2013
dc.date.updated 2014-01-13T16:48:02Z
dc.description.abstract Improved actuator point-to-point positioning performance, as measured by settling time, has been demonstrated in the context of manufacturing automation applications such as circuit board assembly and other product-transfer operations. The control objective is to move a single mass in a single axis from a starting position to a target position following the fastest possible motion trajectory while meeting final-position accuracy requirements. The actuator's achievable force that is available for acceleration is the fundamental variable that determines optimal settling time. The actuator technology employed is the linear variable reluctance motor. Mathematical motor models and simulation programs have been developed to perform several tasks necessary for demonstrating improved actuator performance: (i) optimal commutation under force ripple constraints has been computed to determine ripple-specified force limits and to provide excitation waveforms necessary for force production, (ii) motion profiles for several positioning task scenarios have been generated based on computed ripple-specified force limits, (iii) state space integral position control simulations have been performed to evaluate the degree of success of the proposed relaxation of force ripple constraints in improving settling time and (iv) the computed settling times for positioning tasks have been examined in relation to the copper losses associated with them in order to assess the trade-off. It has been shown that higher force capability is achieved when force-ripple constraints, which have been customarily emphasized in positioning applications, are relaxed. The higher capability is exploited by adopting faster motion trajectories, which are then imposed under feedback control to achieve faster settling time. Improved force capability with relaxed ripple constraints is demonstrated by generating average force versus speed capability curves under ripple constraints ranging from minimal ripple to unconstrained ripple. Improved positioning performance, with relaxed ripple constraints and without violating the final-position accuracy specification, is demonstrated by computing and comparing settling time for multiple positioning tasks with trajectories based on both extremes of force capability, lowest (no-ripple) and highest (unconstrained-ripple) force limits. The results have been demonstrated for two LVR motor configurations: one motor configuration represents typical (switched) linear and rotary variable reluctance motors while the other exhibits features of both switched and synchronous varieties of variable reluctance motors.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/50310
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Variable reluctance motors
dc.subject Point-to-point positioning
dc.subject.lcsh Reluctance motors
dc.subject.lcsh Actuators
dc.title Performance limits of linear variable reluctance motors in controlled linear motion applications
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Taylor, David G.
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication a6615de9-0526-43fd-84a6-b2185a733191
relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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