Propulsion Requirements for High-Speed Vehicles with Electrodynamic Suspension
The thrust force and power requirements for the propulsion of a vehicle with electrodynamic suspension (i.e., using superconducting magnets) are discussed. Acceleration thrust, magnetic drag, and aerodynamic drag are shown to lead to calculated power requirements of 8.0 MW under acceleration, and 5.2 MW for cruising at 300 mi/h. Aerodynamic and magnetic drag forces together produce acceptable passive deceleration characteristics. Propulsion requirements under normal operation and in emergency situations (i.e., unscheduled stops) are described. Propulsion systems are discussed, and it is concluded that the linear synchronous motor is most suitable for the proposed Maglev vehicle.
A linear synchronous motor for high-speed ground transport
This paper describes a linear synchronous motor which has been designed to propel a 500 km/hr electrodynamically-levitated vehicle. Superconducting magnets on the vehicle interact with an aluminum-cable winding built into the guideway. Following a description of the motor, a coupled-circuit model is derived and used to optimize the winding Configuration and to predict the performance of the motor. An inverter which acts as a controllable current source is used with the motor.
Formulas for calculating short-circuit forces between conductors of structural shape
THE mechanical forces acting on busbar supports during short circuit are determined both by the magnitudes of the mutual electromagnetic forces exerted among the bus conductors and by the elastic properties of the supporting structure: its motional resistance, natural frequencies, and physical nature and arrangement. Comprehensive mathematical studies,<sup>∗∗</sup> substantiated by experimental data, of the individual and collective effects of these factors and general methods for calculating the magnitudes involved have been advanced by Schurig and Sayre,<sup>1</sup> Dahlgren,<sup>2,3</sup> and Pilcher.<sup>4</sup> In shorter articles based on the work of the first-named Schurig, Fricke and Sayre,<sup>5</sup> Tanberg,<sup>6</sup> Specht,<sup>7</sup> Edson,<sup>8</sup> and others<sup>9</sup> have presented certain charts, nonograms, and short cuts that facilitate the numerical labor incident to actual calculation.