Linear Synchronous Motor Control for an Urban MAGLEV

Authors:
Doll D.W., Kratz R., Newman M.J., Plunkett A.B., Blevins R.D.
General Atomics, San Diego, CA, USA

Abstract:
A new concept in Urban Maglev transportation design is in the testing phase. The vehicle uses permanent magnets (PM) for both the electro-dynamic suspension (EDS) and linear synchronous motor (LSM) propulsion. Because of the 3D coupled non-linear velocity-dependent magnetic levitation, the LSM must provide stabilizing forces to the vehicle. To do this, Vector Control is used to modulate the inverter voltage, frequency and angle. The inverter angle is adjusted to maintain vertical stability. The controls architecture was developed and tested in a 2D simulation and verified in a 3D six dof dynamic model of the vehicle and guideway; the same magnetic levitation and LSM propulsion algorithms were used in both with the 2D simulation model providing the common control system. Control programming was implemented in C-code, which talks to the inverter pulse width modulation (PWM) card via an intermediate control box. The 2D simulation architecture provided the basis for implementing the control software design. Results from preliminary testing are discussed.

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