A method for estimating load inertia and system for controlling motor speed using inverse model are provided, suitable for an alternating current servo module. The ethylene copolymer may further be made from carbon monoxide monomers. The first string of MRAM cells include a plurality of MRAM cells connected in series and the second string of MRAM cells include another plurality of MRAM cells connected in series. An upper loop portion and a lower loop portion at both ends of the locking member are fixed to the seat back 21 together with the backboard by clips. As a segment is unloaded, its space is converted to free IMS space and when appropriate, combined with adjacent free space already in the block.