Permanent magnet linear motors are fit for the application of quick acceleration and braking within short distance in electromagnetic aircraft launch systems, but eddy current is likely to be induced by its quick moving. In the acceleration stage, the resistance force deduced by the eddy current can reduce the launch ability of system. On the other side, the force deduced by the eddy current can improve the braking ability in brake stage. This study analyzed the eddy current force in a kind of linear motor with open slot, concentrated winding, and moving permanent magnet. In the acceleration area, the eddy current resistance force deduced by the aluminum sleeve of the permanent magnet mover was analyzed. A method to weaken this resistance force by half open slot and hollow sleeve structure was proposed, and the feasibility was proven. In brake area, a solid stator structure was proposed to take the place of a laminated stator structure, which can increase the eddy current braking force and shorten the braking time. A simplified function has also been formulated for the eddy loss. Simulation results indicate that a hybrid braking technique combining eddy current braking and plug braking can improve the braking ability efficiently.