Liquid stirrer with magnetic coupling

摘要

The stirrer comprises a driving magnetic portion (13) and a driven magnetic portion (14). The driven portion is for placing on the bottom of a receptacle (51) containing a liquid to be stirred. The driving portion (13) is controlled so as to drive the driven portion (14) in rotation about a predetermined axis of rotation (81) by means of magnetic coupling with the driving portion. The stirrer is characterized in that the driving and driven portions are configured in such a manner as to encourage the field lines (15) that result from the magnetic coupling to extend substantially perpendicularly to the axis of rotation in the vicinity of the driven portion. Axial attraction between the driving and driven portions is thus considerably reduced for given torque transmission to the driven portion, such that the driven portion (14) and the bottom of the receptacle (51) are subject to less wear during rotation of the driven portion.