An energy storage apparatus has one or more camshafts, one or more cams connected to the camshaft, one or more followers contacting the cam, one or more biasing members connected to the follower, and one or more tracks connected to the follower. With embodiments herein the track limits movement of the follower to a constrained path intersecting the axis about which the camshaft rotates. Alternatively, the biasing member itself can limit the movement of the follower to this linear path. The biasing member can comprise any force member such as a spring, a piston, a flexible member, a compressible member, etc. that has the ability to bias the follower toward the axis of the camshaft. The embodiments herein store and transfer potential energy to reduce the total reflected torque on the motor.