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Rotating Capacitors with Spiral Groo...

Knippel, Ryan.

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Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems./
Author:	Knippel, Ryan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	223 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
Subject:	Fluid mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13883376
ISBN:	9781392169834

Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems.
Knippel, Ryan.

Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 223 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2019.

This item must not be sold to any third party vendors.

A survey of rotary power conversion systems based on electrostatics shows favorable features in materials and manufacturing, but they lag the gap power density of electromagnetic approaches by orders of magnitude. Rather than trying to match the air gap power density of electromagnetics, this work pursues modes of maximizing the capacitive surface area while minimizing the dielectric gap present in electrostatically coupled systems. Utilizing hydrodynamic bearing structures integrated into the surface of the rotating capacitors, the dielectric gap may be maintained at distances approaching tens of microns over tens of centimeters up to speeds exceeding 30,000 rotations per minute. This approach eliminates the longstanding air gap field impediment to electrostatic systems by increasing volumetric power density. The ability of this mechanical approach to enable capacitively coupled system is demonstrated in two areas of power conversion, wireless power transfer and an electric machine platform.The wireless power transfer portion of this research culminates the design and implementation of a system of axially stacked rotating capacitors for wireless power transfer, known as a capacitive power coupler (CPC). This device delivered 700 W at 6.5 amps of excitation to the field coils of an 80 kW wound field synchronous machine. 6 stator and 5 rotor discs offset by 115 microns comprised each of the two 2.8 nF coupling capacitors, yielding a total capacitor length of 4.98 mm. This design achieved a gap/rotor diameter aspect ratio previously attained only in the MEMs community, opening the way for the development of a macroscale electrostatic mechanical platform.An axial flux PCB based electrostatic induction machine (ESIM) platform utilizing the principles of operation of, and tools resulting from the capacitive coupler was constricted. Structural models based on tensile tests of FR4 were developed to predict safe operation spaces of the ESIM. The final ESIM platform maintains an axial air gap of 57 microns across its 170 mm diameter rotor face (a 1:1500 aspect ratio) and delivers 2.4 W of mechanical power per facing pair of rotor and stator discs. This proof of concept machine provides the first strong mechanical base for future electrical optimization of these machines.

ISBN: 9781392169834Subjects--Topical Terms:

528155
Fluid mechanics.

Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems.
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020 $a 9781392169834
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100 1 $a Knippel, Ryan. $3 3437968
245 1 0 $a Rotating Capacitors with Spiral Groove Features for Hydrodynamic Gap Maintenance in Power Conversion Systems.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 223 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Ludois, Daniel C.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a A survey of rotary power conversion systems based on electrostatics shows favorable features in materials and manufacturing, but they lag the gap power density of electromagnetic approaches by orders of magnitude. Rather than trying to match the air gap power density of electromagnetics, this work pursues modes of maximizing the capacitive surface area while minimizing the dielectric gap present in electrostatically coupled systems. Utilizing hydrodynamic bearing structures integrated into the surface of the rotating capacitors, the dielectric gap may be maintained at distances approaching tens of microns over tens of centimeters up to speeds exceeding 30,000 rotations per minute. This approach eliminates the longstanding air gap field impediment to electrostatic systems by increasing volumetric power density. The ability of this mechanical approach to enable capacitively coupled system is demonstrated in two areas of power conversion, wireless power transfer and an electric machine platform.The wireless power transfer portion of this research culminates the design and implementation of a system of axially stacked rotating capacitors for wireless power transfer, known as a capacitive power coupler (CPC). This device delivered 700 W at 6.5 amps of excitation to the field coils of an 80 kW wound field synchronous machine. 6 stator and 5 rotor discs offset by 115 microns comprised each of the two 2.8 nF coupling capacitors, yielding a total capacitor length of 4.98 mm. This design achieved a gap/rotor diameter aspect ratio previously attained only in the MEMs community, opening the way for the development of a macroscale electrostatic mechanical platform.An axial flux PCB based electrostatic induction machine (ESIM) platform utilizing the principles of operation of, and tools resulting from the capacitive coupler was constricted. Structural models based on tensile tests of FR4 were developed to predict safe operation spaces of the ESIM. The final ESIM platform maintains an axial air gap of 57 microns across its 170 mm diameter rotor face (a 1:1500 aspect ratio) and delivers 2.4 W of mechanical power per facing pair of rotor and stator discs. This proof of concept machine provides the first strong mechanical base for future electrical optimization of these machines.
590 $a School code: 0262.
650 4 $a Fluid mechanics. $3 528155
650 4 $a Electrical engineering. $3 649834
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690 $a 0544
710 2 $a The University of Wisconsin - Madison. $b Engineering Mechanics. $3 3181618
773 0 $t Dissertations Abstracts International $g 80-12B.
790 $a 0262
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13883376