An actuation assembly comprising: a drive mechanism including an array of magnetic members moveable along an axis, wherein the drive mechanism includes an armature having a plurality of armature windings, each including a first portion and a second portion; and a gear train including an input connected to the drive mechanism and an output, arranged to drive a component in use; wherein the drive mechanism causes the input to move in response to generating an electromagnetic field, generated by passing a current through the armature windings of the armature that interacts with at least one of the magnetic members of the array of magnetic members; wherein the gear train is an epicyclic gear system including a sun gear, a carrier coupled to a plurality of planetary gears, and a ring gear, the sun gear defining the input, and the carrier or the ring gear defining the output, wherein the drive mechanism is a linear motor defining an infinite stroke length, wherein the array of magnetic members are carried in a rubber belt or another elastic polymeric material, or coupled in a chain to form a a loop configuration about first and second pulleys (48A,48B), which rotate about two parallel axes that are perpendicular to the axis along which the array of magnet members move, wherein the first pulley is coupled to a first spur gear and the second pulley is coupled to a second spur gear, the first and second spur gears driving the sun gear through a belt drive; wherein the loop configuration at least partially surrounds and houses the carrier in a plane parallel to the axis along which the array of magnetic members move and passes between first and second portions (38, 40) of the armature windings. a drive mechanism including an array of magnetic members moveable along an axis, wherein the drive mechanism includes an armature having a plurality of armature windings, each including a first portion and a second portion; and a gear train including an input connected to the drive mechanism and an output, arranged to drive a component in use; wherein the drive mechanism causes the input to move in response to generating an electromagnetic field, generated by passing a current through the armature windings of the armature that interacts with at least one of the magnetic members of the array of magnetic members; wherein the gear train is an epicyclic gear system including a sun gear, a carrier coupled to a plurality of planetary gears, and a ring gear, the sun gear defining the input, and the carrier or the ring gear defining the output, wherein the drive mechanism is a linear motor defining an infinite stroke length, wherein the array of magnetic members are carried in a rubber belt or another elastic polymeric material, or coupled in a chain to form a a loop configuration about first and second pulleys (48A,48B), which rotate about two parallel axes that are perpendicular to the axis along which the array of magnet members move, wherein the first pulley is coupled to a first spur gear and the second pulley is coupled to a second spur gear, the first and second spur gears driving the sun gear through a belt drive; wherein the loop configuration at least partially surrounds and houses the carrier in a plane parallel to the axis along which the array of magnetic members move and passes between first and second portions (38, 40) of the armature windings.