Investigation of a flux-switched permanent magnet linear motor for tamping machine

摘要

Tamping machine is one of the pivotal devices for coking plants. Most tamping machines are still driven by rotatory electric motors, through mechanical transmission components, leading to low energy efficiency, slow working frequency and huge maintenance fees. In fact the tamping machine can be directly driven by linear motors. Directly driven system will be simpler with higher working frequency, more energy efficiency and less fee for maintenance. Their exits great challenges for the working linear motors. High energy density is necessary for there is not plenty of space in the liner direction. And the impact force that acts on hard cokes would counter-reflect back on the mover, leading to great vibrations. So usual permanent magnet linear motors cannot afford such working conditions and induction linear motor is with low energy density, as known, which may lead to overheated if over loaded, pursuing small volume. However it's quite qualified for the flux-switched permanent magnet linear motor (FSPMLM) to drive, with permanent magnets and coil windings in armature and just irons for the secondary, which is even simpler and more robust than that of induction motors. When driven by FSPMLM, the tamping machine will surely be with the merits of robustness, high energy density, quick response and excellent efficiency.