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ABSTRACT
A study has been conducted to evaluate design parameters of mobile-primary linear induction drives with variable-voltage fixed-frequency (WFF) excitation. This mode of drive is considered potentially viable for certain transit operations, such as inter-terminal airport shuttles. Each vehicle would pick up 60 Hz three phase AC, and the LIM thrust would be adjusted by an on-board phase-controlled thyristor power conditioner. This mode of operation is considerably simpler than the inverter-fed variable-voltage variable-frequency (VWF) LIM drive, but results in an appreciable increase in the required kVA rating of the power conditioner. Design studies have been conducted for both aluminum-capped and solid-steel reaction rails, using computer models validated by large scale test data. An evaluation of rail heating has shown that the temperature rise of an aluminum cap can be very high under WFF conditions, and a solid-steel rail is recommended for fixed-frequency transit applications.