Degrees of Freedom Control through Three Electromagnets and Three Linear Induction Motors
Configuration that the mover has three electromagnets and three linear induction motor (LIM) has been proposed for contactless flexible conveyance system. Hybrid electromagnet that uses permanent magnet can let power consumption converge to zero in steady state, and its stator becomes simple because the combination of three LIM’s is used for two-dimensional drive. The normal attractive force of LIM can increase the carrying capacity of the mover, although it can be also disturbance force for the stabilization of the magnetic levitation system. Authors have experimentally confirmed that the proposed configuration can realize six-degrees of freedom control of the mover. Position sensing for the closed loop control of two-dimensional linear drive is difficult: one possible approach based on visual sensing combined with dual sample-rate digital observer is proposed and discussed.
PERFORMANCE IMPROVEMENT OF A LINEAR ENCODER BY MULTIRATE SAMPLING OBSERVER
This paper describes an effective way to improve the performance of a linear encoder by introducing an estimation technique called multirate sampling observer. The authors analyses the observer by using multirate sampling theory and verifies its effectiveness by various Simulations. Key words—Linear encoder, multirate sampling observer , position and speed estimation.
HSST-03 SYSTEM
The HSST-03 System is a magnetic levitation-type linear motor car developed by Sumitomo Electric in conjunction with Japan Airlines for display at the 1985 International Science and Technology Exposition in Tsukuba, Japan. This paper reports on HSST-03 system design specifications and the results of the various tests conducted with the HSST-03 System in preparation for the Exposition.