Rick Hoadley
Adjunct Professor Milwaukee School of Engineering
- Milwaukee WI
Rick Hoadley is an electrical engineer with expertise in DC and AC drives, drive applications, transformers, power electronics and quality.
Milwaukee School of Engineering
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Education, Licensure and Certification
B.S.
Electrical Engineering
Cornell University
1973
M.S.
Electrical Engineering
Cornell University
1974
Biography
In addition to teaching electrical systems courses at MSOE, Hoadley is a principal consulting applications engineer for ABB Inc. He also has industrial experience as a technical program manager with Rockwell Automation, and as a program manager for Warner Electric Brake and Clutch, SECO div. of DANA Corp. and Borg-Warner Power Electronics.
Areas of Expertise
Accomplishments
Innovation Award, AC Motor Drive Harmonic Mitigation, Rockwell Automation
2003, 2004, 2005
Second Place, IEEE-PPIC, 2007
"Comparison of Methods for the Mitigation of Line Disturbances Due To PWM AC Drives"
Winner, Technical Category, WEFTEC 2015 IKE Video
Awarded for the video titled, “How do VFDs Reduce Energy Costs in Pumping Applications?”
Affiliations
- Institute of Electrical and Electronics Engineers (IEEE), Senior Member
Event and Speaking Appearances
Mitigating harmonics and detrimental waveforms caused by active front ends and 6, 12, 18 pulse drives
Electrical Apparatus Service Association Annual Convention Las Vegas, NV., July 2013
Mitigating harmonics and detrimental waveforms caused by VFDs
Electrical Apparatus Service Association Annual Convention Boston, MA., June 2014
Application considerations for operating VSI_Fed MV motors in hazardous locations
IEEE Petroleum and Chemical Industry Technical Conference Tutorial Philadelphia, PA., September 2016
Introduction to variable speed drives
ABB Capacitor Applications Seminar Atlanta, GA., October 2018
Fundamentals of Inverter and Rectifier Circuits
PCIC Conference Cincinnati, OH., September 2018
Teaching Areas
EE201 - Linear Networks - Steady State Analysis
Methods used to analyze circuits made up of resistors, capacitors and inductors in order to determine the current through and votlage across each device in the circuit under non-transient conditions.
EE3401 - Electromechanical Energy Conversion
A study of devices used in the conversion of mechanicl energy to electrical energy (generator), from electrical energy to mechanical energy (AC or DC motor), change voltage magnitudes (transformers), and how they interact with other devices.
EE4480 / EE5480 - Electrical Power Systems Quality
An investigation into the various events that cause problems with other electrical equipment. Events such as lightning strikes, voltage sags, voltage transients due to power factor correction capacitors being energized, etc.
Patents
Systems and Methods for Controlling a Switching Device for an Electric Motor with Selective Flux Stator
11,949,354
2024
Power Conversion System and Method
8,299,732
2012
Integrated Power Conditioning System and Housing for Delivering Operational Power to a Motor
7,724,549
2010
System and Method for Precharging Passive Harmonic Filters
7,656,117
2010
Control System for Active Power Filters
6,657,322
2003
DC Bus Current Monitoring
4,521,840
1985
Selected Publications
Best Practices for Mitigating Bearing Currents
Pumps & SystemsMcElveen, R., Hoadley, F.
2019
Application Considerations for Operating VSI-FED MV Motors in Hazardous Locations
IEEE Transactions on Industry ApplicationsHoadley, F.L., McElveen, R.F.,Obermann, T.R.
2016
Determining the suitability of a medium-voltage motor which will be installed within a hazardous location as outlined in IEEE 1349, powered by a multi-level, voltage source, adjustable speed drive that is not isolated by a phase-shifting transformer requires two key items to be investigated - thermal heating due to the current harmonics, and the energy contained in uncontrolled sparking from the motor shaft to ground. This paper reviews the process that was used for a possible application of a drive with a motor in a Class I, Division 2 environment, along with modifications that were made to the design and operation of the drive to meet the stated requirements.
Comparison of AC to DC Rectifier Topologies Operating on Various Power Distribution Networks
Conference Record of the 2008 IEEE Petroleum and Chemical Industry Technical ConferenceHoadley, F., Kennedy, S., Skibinski, G.
2008
This paper compares the attributes of various rectifier topologies that are available for three-phase AC to DC power conversion. The primary goal is to reduce the line current harmonics by the use of various 12-pulse converters, 18-pulse converters, or active front-end converters. The attributes that will be compared are the total harmonic current distortion, total harmonic voltage distortion and power factor. When operating multiple loads, an additional study will be a comparison of those attributes as the loads are varied. There is also a comparison of parts count, relative reliability, and considerations on relative size and cost. An investigation into the susceptibility of the rectifier system to voltage unbalance and voltage distortion is included. Power distribution systems include a moderately stiff source in addition to a back-up generator.
Comparison of Methods for the Mitigation of Line Disturbances Due To PWM AC Drives
Conference Record of the 2007 IEEE Pulp and Paper Industry Technical ConferenceHoadley, F.L.
2007
Several methods are used to reduce the line current harmonics created by PWM AC drives, and by doing so, also reduce the voltage distortion at the secondary terminals of the supply transformer. However, each method also impacts the power distribution system in a different way, and has an impact on the operation of the drive itself. This paper will review and compare the effects that harmonic mitigating methods have on the line supply and on the drive. The comparisons are supported by computer simulations of drive systems and verified by extensive tests that were conducted in the lab.
Curb the Disturbance
IEEE Industry Applications MagazineHoadley, F.L.
2008
This article reviews and compares the effects of harmonic mitigation methods on line supply and drive. Several methods are used to reduce the line current harmonics caused by pulse width modulated (PWM) ac drives: ac line reactors, dc link chokes, phase-shifting transformers, passive harmonic filters (PHFs), multipulse converters, active filters, and active front ends. Each one does a good job of harmonic reduction and also affects the total current drawn from the supply transformer, the power factor, and the dc bus voltage within the drive. Several passive and active filters and an 18-pulse converter were tested. The comparisons are supported by computer simulations of drive systems and verified by extensive tests that were conducted in the lab.
