Efficiency Improvement by Deriving the Optimal Operating Slip Frequency of a Linear-Induction-Style Maglev Train

Abstract

While urban maglev trains have the advantage of being optimized for urban environments where noise is low and dust is less generated, their driving efficiency is low when compared to rotary induction motors owing to the structural limitations of linear devices. To compensate for these disadvantages, various studies on train control schemes have been conducted. Representative control methods include improving the efficiency of using slip frequency by directly controlling the propulsion force using vector control. However, this method has limitations in its use as it relates to the normal force that affects the train’s levitation system. Therefore, in this study, mathematical analysis was conducted for each factor that mutually affects the control of the train. On this basis, the magnitude of the normal force related to the safety of the train is limited. Operating efficiency was improved by varying the slip frequency according to the operating conditions of the train. In addition, for verification, the effect was proved through a comparative experiment using an 18 ton class maglev train running at Incheon International Airport.

The Performance of Induction Machines

“…Eleven scientific papers were collected in this Special Issue [1][2][3][4][5][6][7][8][9][10][11]. These papers concern many aspects of the theory, design, control, optimization, supervision, and use of induction machines (IMs).…”

“…Park, S.-U. et al [10] have investigated the efficiency improvement of the slip frequency in LIMs. In their study, mathematical analysis was conducted for each factor that mutually affects the control of the train.…”

Characteristics Analysis and Comparison of a Cylindrical Linear Induction Motor with Composite Secondary Structure

“…In [7], a novel analytical equivalent circuit for a Single-sided Linear Induction Motor (SLIM) is proposed, which considers the secondary reactance for both edge effects, i.e., entry and exit sides. In [8], mathematical analysis was conducted for each factor that mutually affects the control of the train. The magnitude of the normal force related to the safety of the train is limited, and operating efficiency was improved by varying the slip frequency according to the operating conditions of the train.…”

Design and Experimental Validation of a Fuzzy Cascade Controller for a Zero-Power Permanent Magnetic Suspension System with Variable Flux Path Control

“…Compared with ordinary trains, the maglev train has the advantages of faster speed, less noise and less harm to the environment; hence, the magnetic force technology that is applied to the vehicle is widely studied by the researcher. Park et al [14] investigated each factor that mutually affects the control of the maglev train using mathematical analysis and improved the operating efficiency by varying the slip frequency according to the operating conditions of the maglev train. Based on the model of the maglev train, the dynamic processes were established and analyzed by Chaban et al [15], including the effect of the magnetic potential hole, and a system of ordinary differential equations of the dynamic state was presented in the normal Cauchy form.…”