Permanent magnets in the impeller are coupled magnetically through the bottom of the mixing vessel to matching magnets in the drive unit. Consequently, no seal through the vessel is required. The impeller floats on a powerful magnetic field and rotates around a male bearing which acts purely as a guide. Thanks to its levitation there is no direct contact between the female rotating bearing and the stationary male guide bearing. Drive is provided by a motor mounted externally and operated via a frequency converter.
Contactless rotation makes the MM much more efficient than conventional, mechanical mixers in several important ways:
Unlike other magnetic mixers, the UltraPure MM does not rely on electrical current for its magnetic field. The magnets are permanently magnetised. The impeller therefore stays levitated at all times, without liquid or electrical energy, and need not be stopped for the CIP (clean-in-place) process. The UltraPure Magnetic Mixer is so efficient compared to conventional alternatives that it can pay back the capital cost in under one month. Combined with Alfa Laval’s revolutionary Rotary Jet Mixer, the new UltraPure Magnetic Mixer forms one of the most innovative and efficient tank mixing ranges currently available.