The advantages of the centrifugal mills are their flexibility in particle size reduction by adapting the rotor speed.
However, adapting rotor speed by variable speed drive has its limits:
- Indeed, it reduces speed to constant torque, meaning that the available power lowers along with the speed;
- It can reduce speed by a factor of 1:5 in industrial applications.
In applications where a higher speed reduction is required, a special execution has been developed by Lessine using a dual-speed motor.
The usage of a pole-changeable motor, based on Dahlander winding combining 4-2, 8-4, 12-6 or other separate windings, extends the limits of the flexibility of the pin or hammer types centrifugal mills.
Lessine dual-speed Multibop pin mill can be made of carbon steel or stainless steel. The milling motor includes a hub and a moving plate fitted with pin crowns or hammer plates.
In case of pin mill, a stator – made of several pin crowns – is fixed on the hinged door wherein the hammer plate design, a cylindrical control sieve is mounted on the periphery of the rotor.
