Linear motor within a positioning device

A linear motor comprising:

• first and second motor sections which are movable relative to one another along a direction parallel to a motor axis, a first motor section comprising a coil support carrying a system of three coils with their respective coil axes aligned parallel to said motor axis and whose turns are oriented perpendicularly of the motor axis, and a second motor section comprising a magnet support carrying at least one pair of magnets which, viewed along the motor axis, are spaced at a distance from one another to form a non-magnetizable gap and which have magnetic poles facing the first motor section to cooperate with the system of coils across an air gap, characterized in that the system of three coils of the first motor section comprises a set of two peripheral coils and one central coil, the central coil having a coil length substantially equal to said distance between the pair of magnets of the second motor section, the central coil being disposed substantially completely opposite the gap between the magnets in a neutral position of the motor sections relative to each other.