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ECCENTRIC ROTOR EDDY CURRENT SEPARATOR (IC-EC)

AN ECCENTRIC ROTOR EDDY CURRENT SEPARATOR?

An Eccentric Rotor Eddy Current Separator (IS-EC) extracts non-ferrous metals by making use of induced currents generated by a magnetic rotor spinning at high speeds. 

An Eccentric Rotor Eddy Current Separator mechanically resembles a conveyor belt and it is usually installed in line in a waste recycling plant. The main purpose of the machine is to separate the Non-ferrous metals from non-metals or, eventually, recover fine ferrous metals that the iron-removers installed upstream did not attract. 

Eccentric rotor eddy current separators are the ideal solution to separate fine non-ferrous metals particles measuring less than 5mm. 

HOW IS AN ECCENTRIC ROTOR EDDY CURRENT SEPARATOR MADE?

The main component of the machine is the magnetic rotor. 

The number of grooves in a magnetic rotor equals the number of magnetic poles. The poles are always a whole and equal number – it generally varies from 8 to 40. 

A series of permanent magnets is installed in each groove alternating N/S polarity.

The magnetic rotor is then enclosed in a dielectric cylinder. The conveyor belt, made of rubber or PVC, makes this dielectric cylinder rotate. 

Unlike a concentric rotor Eddy Current Separator, the eccentric rotor one mounts smaller, yet more powerful permanent magnets. The rotor can therefore spin faster but with the same centrifugal force. 

The speed at which the rotor spins must be as low as possible in order to enhance the durability of wear components such as the electric motor, bearings, transmission, etc.

HOW DOES AN ECCENTRIC ROTOR EDDY CURRENT SEPARATOR WORK?

When rapidly rotating, the rotor induces a stator current onto the metals contained in the waste stream. The N/S alternating field is generated by permanent magnets fitted into the grooves on the rotor’s surface. The effect of the eddy current is to induce a second magnetic field which reacts with the magnetic field generated by the rotor.

The result of this combination is a powerful repelling force that diverts Non-Fe metal intrusions from the remaining waste stream.

In order for the eddy current to be transformed into kinetic repulsive energy, the conductivity, resistivity and mass of Non-Fe metal has to be taken into account. To make it easier, the force that repels Non-ferrous metals is proportional to the object’s electrical conductivity/specific gravity ratio. The higher is this ratio, the stronger is the repelling force. 

The speed at which the rotor spins must be as low as possible in order to enhance the durability of wear components such as the electric motor, bearings, transmission, etc.

ECCENTRIC ROTOR EDDY CURRENT SEPARATORS: TYPES AND MODELS

The size and model of the separator are established together with the customer in order to best meet their separation needs. 

Our Eccentric Rotor Eddy Current Separator distinguishes itself from those of other manufacturers for a series of reasons:

  1. The rotor can rotate either clockwise or counterclockwise;
  2. The axis of the rotor shaft can rotate at 360° inside the dielectric cylinder;
  3. The engines can be mounted either on the right or left of the separator according to our customer’s request;
  4. The eccentric rotor can be easily mounted onto any Malaman’s Eddy Current Separator with concentric rotor;
  5. The conveyor belt runs on idle rollers (not on plastic sheets or plates);
  6. This separator is supplied with a rubber or PVC belt with belt joint.

Malaman C.T.C. builds and produces Eccentric Rotor Eddy Current Separators (IS-EC) with working widths from 500mm to 2.500mm and various types of machine frames. 

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