“…The LSRM designs based on an open RSRM structure, consists of a single primary and secondary ( [53], [54], [5], [32]). In such configuration, the system has to deal with high attractive force which is difficult to control [14], [38]. Researchers adopted a twin symmetric primary design that eliminates the unbalanced attractive force ( [34], [35], [56], [18], [2], [9], [26], [6]).…”