Title page for ETD etd-05142012-092720

Type of Document Dissertation
Author Swint, Ethan Baggett
URN etd-05142012-092720
Title DC Reluctance Machine – A Doubly-Salient Reluctance Machine with Controlled Electrical and Mechanical Power Ripple
Degree PhD
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Lai, Jih-Sheng Jason Committee Chair
Nelson, Douglas J. Committee Member
Odendaal, Hardus Committee Member
Stilwell, Daniel J. Committee Member
Yu, Wensong Committee Member
  • DC Reluctance Machine
  • Shaped Reluctance Machine
  • Doubly-Salient Reluctance Machine
  • Switched Reluctance Machine
  • Torque Ripple
  • Current Ripple
  • Power Ripple
Date of Defense 2012-02-27
Availability unrestricted
Doubly-Salient Reluctance Machines (DSRMs) sidestep many of the issues with permanent

magnet and induction machines and embody the lowest cost and simplest manufacturing of the

motor technologies. Major drawbacks to RMs have been (1) the need for failure-prone

electrolytic capacitors, (2) large torque ripple, and (3) acoustic noise. Conventionally, these

drawbacks have been addressed independently either through (1) excitation control or (2)

machine design, but not as a holistic system or solution. This disseratation presents a design for

high-efficiency low-cost RM while producing smooth output torque and avoiding pulsating

inverter input current and the associated electrolytic capacitor. We propose a method for shaping

the machine reluctance profile to reduce machine torque ripple to a desired level (here, <5%)

without compromising on machine efficiency or power density, a Shaped Reluctance Machine

(ShRM). Furthermore, a comprehensive approach which combines both phase excitation control

and machine design to cooperatively address the excursions of input and output powers from

their average values which results in less than 5% ripple for both electrical and mechanical net

power – essentially a DC Reluctance Machine (DCRM). Compared to conventional practice in

DSRMs, electrical power ripple is reduced by 85 times and torque ripple is reduced by almost 20

times, while overall efficiency, torque density, and power density are maintained.

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