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Transient analysis of electromagnets...

Batdorff, Mark A.

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Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry./
Author:	Batdorff, Mark A.
Description:	236 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5668.
Contained By:	Dissertation Abstracts International71-09B.
Subject:	Engineering, Agricultural. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3413884
ISBN:	9781124154879

Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry.
Batdorff, Mark A.

Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry. - 236 p.

Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5668.

Thesis (Ph.D.)--Purdue University, 2010.

Valves are commonly used in fluid power systems to control pressure and flow. The emerging field of digital hydraulics demands high-speed, low cost, on/off valves with improved performance. Electromagnets, or solenoids, are commonly used to actuate valves due to their low cost, high reliability, and moderate performance. This work develops a dynamic model for a solid steel electromagnet that can be used for design and optimization, and unveils design tradeoffs with geometry and driving circuitry that are often overlooked.

ISBN: 9781124154879Subjects--Topical Terms:

1019504
Engineering, Agricultural.

Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry.
LDR:03521nam 2200361 4500 001 1397121
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008 130515s2010 ||||||||||||||||| ||eng d
020 $a 9781124154879
035 $a (UMI)AAI3413884
035 $a AAI3413884
040 $a UMI $c UMI
100 1 $a Batdorff, Mark A. $3 1675937
245 1 0 $a Transient analysis of electromagnets with emphasis on solid components, eddy currents, and driving circuitry.
300 $a 236 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5668.
500 $a Adviser: John Lumkes.
502 $a Thesis (Ph.D.)--Purdue University, 2010.
520 $a Valves are commonly used in fluid power systems to control pressure and flow. The emerging field of digital hydraulics demands high-speed, low cost, on/off valves with improved performance. Electromagnets, or solenoids, are commonly used to actuate valves due to their low cost, high reliability, and moderate performance. This work develops a dynamic model for a solid steel electromagnet that can be used for design and optimization, and unveils design tradeoffs with geometry and driving circuitry that are often overlooked.
520 $a This work develops an accurate, computationally efficient, nonlinear, coupled, dynamic, axisymmetric, high fidelity magnetic equivalent circuit (HFMEC) electromagnet model capable of predicting force, inductance, dynamic response, and energy consumption. The model is intended for applications where both accuracy and solution time are critical. Axisymmetric magnetic fringing and leakage permeances were derived in order to capture nonlinear magnetic field phenomena that affect force and inductance.
520 $a The tradeoffs between solid-center and hollow-center electromagnets were investigated. It was shown with both simulation and measurement that a hollow-center electromagnet has a 37.7% shorter useful stroke due to increased magnetic fringing and leakage (from 4.0mm to 2.5mm). However, it was also shown that the hollow-center electromagnet has a 70% improved turn-off response (from 617ms to 362ms). A single objective optimization study was performed demonstrating that hollow-center electromagnets are advantageous and can up to 204% increased dynamic response for systems where dynamics are dominated by eddy current lag.
520 $a Electromagnets experience dynamic lag when turning on and off due to inductance and eddy currents. Coil driving methods, such as peak-and-hold, are often used to minimize turn-on lag by using high initial voltages and currents. However, circuits often do not address turn-off lag, which can be significant. This work investigates the effects of using momentary reversed current pulses to increase the decay rate of eddy currents in order to improve electromagnet turnoff speed. It is shown with simulation and measurement that driving circuitry can improve dynamic turn-off response by as much as 944% (from 1556ms to 149ms), but increase turn-off electrical energy consumption and heat generation by as much as 1030% (from 1.0J to 11.4J).
590 $a School code: 0183.
650 4 $a Engineering, Agricultural. $3 1019504
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0539
690 $a 0544
690 $a 0607
710 2 $a Purdue University. $b Agricultural and Biological Engineering. $3 1025335
773 0 $t Dissertation Abstracts International $g 71-09B.
790 1 0 $a Lumkes, John, $e advisor
790 1 0 $a Krutz, Gary $e committee member
790 1 0 $a Ivantysynova, Monika $e committee member
790 1 0 $a Sudhoff, Scott $e committee member
790 $a 0183
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3413884