21 May 2019
The 9th International Conference on Power Electronics, Machines and Drives (PEMD 2018) (PEMD 2018)
17–19 April 2018
closed loop systems, suspensions (mechanical components), feedback, choppers (circuits), silicon compounds, electromagnets, MOSFET, magnetic levitation, snubbers, optimisation, closed-loop feedback controller, levitation current, desired magnetic force, considerable electricity, Maglev train, levitation power consumption, weight optimisation, suspension control box, EMS Maglev, typical suspension chopper, suspension chopper optimisation, optimised heatsink design, SiC MOSFET suspension chopper prototype, suspension control systems, optimised design consideration, electromagnetic suspension Maglev trains, green type, track transportation, SiC MOSFET modules, SiC
Electromagnetic suspension (EMS) Maglev trains attracted to suspend above a track is a green type of track transportation. The suspension control box adopting a closed-loop feedback controller outputs a levitation current that flows into the electromagnets producing a desired magnetic force to levitate the train. Without contact frictions, such a promising type of transportation saves considerable electricity for propulsion. Minimising the volume and weight of Maglev trains attracts great research interests and continuous engineering effort as that is closely correlated with levitation power consumption and, more importantly, the construction cost. This paper mainly discusses volume and weight optimisation of suspension control box that contains a suspension chopper in EMS Maglev trains using the state-of-the-art SiC MOSFET modules. By analysing the mission profile of a typical suspension chopper, SiC MOSFET is found to be perfectly suitable for suspension chopper optimisation because of its low power losses. An optimised heatsink design of suspension chopper is given, whose volume is only 21% of the previous design. By utilising a RC snubber, the new SiC MOSFET suspension chopper prototype is built without showing serious voltage ringing. This provides a promising prospect for further optimisation of suspension control systems.