How it works
The magnetic mixer transmits the required torque by means of magnetic coupling. The magnetic coupling consists of two sets of permanent magnets and a weld plate that separates the magnet sets. One set of magnets is mounted in the impeller (1) and the other set in the rotor (6). When the rotor revolves by means of the gear drive, the interaction between the two sets of magnets creates a magnetic coupling, which strenghting the rotation of the impeller. To avoid loss of magnetic coupling, it is necessary to gradually ramp up the rotation by means of a frequency inverter. The typical ramp up time is approximately 30 seconds. The frequency inverter is also used to adjust the speed.
Since the magnetic field couples across an air gap and through the weld plate(4), the tank is not compromised and therefore does not require a seal. This eliminates the risk of leakage and product contamination.
The unique design of the Alfa Laval magnetic coupling ensures the levitation of the impeller at all times. This enables the complete drainability of process fluids and the free flow of CIP liquid and steam around all parts of the mixer, thereby ensuring thorough cleaning. Impeller levitation also eliminates axial wear.
The eight-winged impeller design ensures balanced operation at very low speeds and minimize wear of the bearings (2). Male bearings can easily be replaced with a bearing tool.