Study of Linear Induction Motor and Its Feasibility for High-Speed Ground Transportation

摘要

The report presents the results of a study program performed by AiResearch for the Office of High Speed Ground Transportation, U.S. Department of Transportation. This program is concerned with determining the feasibility and practicality of utilizing linear induction motors for high-speed ground transportation (HSGT) propulsion at speeds up to 500 mph. Detailed consideration is given to the electrical, thermal, and mechanical aspects of linear induction motor design. The electrical design analysis considers motor end effects, reaction rail design, and other motor design parameters influencing performance. The analytical models derived in the study for electrical design are verified in laboratory tests using small rotary motors designed to provide the desired data. Data on five reaction rail designs are reported. A composite reaction rail design is recommended for optimum motor performance, although other types are considered for special characteristics. The thermal studies indicate that the minimum motor size consistent with appropriate operating temperature levels for long motor life corresponds to specific continuous thrusts on the order of 1.2 to 2.4 lb per sq in. per side of motor area. The problems of air gap control, speed control, and power supply are analyzed to determine suitable provisions in the design of HSGT propulsion systems incorporating linear induction motors. Recommendations for future work include fabrication and testing of a full-scale (2500 hp) prototype linear induction motor. (Author)