RECENT TRACTION MOTOR DEVELOPMENTS
Traction motor improvements have been due primarily to developments in insulating materials and methods of applying them, permitting higher temperatures, better dissipation of heat and higher space factors. While the most active weight of a motor is copper and steel, it is unlikely that metallurgical breakthroughs will improve mechanical strength, electrical conductivity or magnetic permeability of these metals. Current collection, commutation and commutator strength are near practical limits as peripheral and rotational speeds have gradually increased. Because the standard dc machine needs only minor changes to enable it to operate on pulsating current, the increasing popularity of a rectified ac supply presents no major problems.
- This paper was presented at a number of centers in the 1976/78 sessions by Mr. D.L. Rawle.
Mechanical Engineering PublicationsPenthouse 1, 15 West 55th Street
New York, NY United States 10019
- Rawle, D L
- Publication Date: 1977-11
- Features: Tables;
- Pagination: 4 p.
- RAILWAY ENGINEER
- Volume: 2
- Issue Number: 6
- TRT Terms: Choppers (Electricity); Cooling systems; Direct current motors; Electric insulating materials; Electric power conditioning; Insulating materials; Motors; Propulsion; Rectifiers; Thyristors; Traction; Traction drives; Vehicle power plants
- Uncontrolled Terms: Propulsion systems
- Old TRIS Terms: Choppers; Electrical insulation
- Subject Areas: Railroads; Vehicles and Equipment;
- Accession Number: 00170283
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 16 1978 12:00AM