Charlotte, North Carolina
June 20, 1999
June 20, 1999
June 23, 1999
4.390.1 - 4.390.16
MOTOR EFFICIENCY IMPROVEMENT EXPERIMENTS
Donald V. Richardson, Emeritus Waterbury State Technical College, Connecticut
This paper describes experiments developed while teaching in the former Waterbury State Technical College. It show how all experiments, however performed, have the same seven fundamental steps. Two things are demonstrated: That original work can be done in a two year school, and to both encourage teachers and professors and ex- plain how original experiments can be performed.
These DC motor experiments, scaled up to diesel electric locomotive traction motors, proved able to clarify and resolve problems known to manufacturers and the AAR (As- sociation of American Railroads) but were unable to explain. The AC experiments show potential efficiency improvements not yet covered in the literature.
I. Introduction Electric motor fundamentals go back to the pioneering experiments of Michael Fara- day, who discovered that a conductor carrying current, when immersed in a magnetic field, produced a lateral force. All motors (and generators) whether AC or DC use this principle, regardless of their specific size or configuration.
DC motors need some form of synchronized current switching to reverse current in the rotor coils as they pass though a magnetic field which reverses at least once per revolu- tion. Traditionally this switching has been done by a rotating metallic commutator and stationary brushes. The commutator is a segmented copper cylinder which sequentially offers access, one coil at a time, to carbon “brushes” which transfer current to that coil, forming a rotating switch.
Only in the past decade or so, have various solid state devices replaced this commuta- tor + brushes package to dynamically route current to/from the optimum rotor coil for smaller motors.
Richardson, D. V. (1999, June), Motor Efficiency Improvement Experiments Paper presented at 1999 Annual Conference, Charlotte, North Carolina. https://peer.asee.org/7838
ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 1999 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015