Modular laser system for level determination

Modular laser level determination system comprising a laser beam generator in a housing, fixed with means of positioning with respect to a plane parallel to the base plane of the said housing, the laser beam being oriented towards a central shaft inside the housing not closed off by any obstacles and firstly passing through collimation means, a rotation drive module of an optical assembly comprising at least one reflection plane, the said rotation drive module being arranged along a direction approximately coaxial with the center line of the laser beam, the rotation drive module of the said optical assembly comprising a brushless motor with electronic switching and a hollow shaft, the motor including a stator that is (a) fixed to an element fixed in rotation about an axis parallel to the axis of the laser beam and (b) can be tilted by a module for determination and adjustment of the inclination with respect to a reference plane parallel to the bearing plane of the enclosure of the housing, the said laser beam generator being fixed to the brushless motor.