The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor.

The ABB gearless mill drive is the most powerful mill drive system on the market. It provides highest availability, long-term reliability, flexibility and efficiency at competitive cost. This is achieved by eliminating all mechanical components of a conventional mill drive system (ring-gear, pinion, gearbox, coupling, motor shaft and motor ...

One of the most important aspect to consider when designing a grinding circuit is the mill drive power train - the technology that will control the mill. Several options exist in the market and it's not always obvious which one fits the best for your installation.

ABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills.

Mill powerdraw. Mill speed influences the power draw in two ways: on the one hand, mill power is the lineal product of the mill rotational speed and the torque applied, so there is a lineal dependence; on the other hand, the centre of gravity of the charge is shifted with speed, creating a non-lineal dependence.

Grinding is a crucial process step in ore processing – and for a mine's overall performance. That's why a grinding mill's gearless drive is the crucial piece of equip-ment in the concentrator – and why it is subject to very rigorous demands.

Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions.

Mill drive selection for semiautogenous grinding mills Dan B. Kivari and John Chapman A key operation of any milling circuit is grinding. Over the last two decades, large diameter semiautogenous grind-ing (SAG) mills have become the pre-ferred primary grinding mills. The drive systems became more complex as the size of the mills became larger ...

Siemens' answer is the latest gearless drive technology for grinding and conveying. Gearless drive solutions are surpassing the mechanical limits of con-ventional drive systems serving to utilize the principle of economies of scale.

The demand for grinding mills beyond today's standards of 40ft is just part of the natural market development and will soon challenge the suppliers. Past experiences guided Siemens to establish a new culture in designing bigger and more powerful Gearless Mill Motors for the expected de-mand for 42ft and 44ft mills.