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- Rolling mills
Rolling drives that run continuously typically have 6-pole cylindrical rotor synchronous motors with a rated frequency of approx. 7 Hz (approx. 140 rpm) and a maximum frequency of approx. 20 Hz (approx. 400 rpm), while the large hot reversing stands are equipped with 12-pole motors with a frequency of approx. 5/10 Hz (approx. 50/100 rpm). - Mine hoists
Mine hoist drives are equipped with 12 to 16-pole synchronous motors with salient pole rotors with a rated frequency of approx. 5 to 10 Hz operating at speeds from about 50 to 90 rpm. - Ore and cement crushers
The 40 to 80-pole ring motors with salient pole rotors are typically operated at approx. 6 Hz (approx. 10 rpm). - Excavators
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