sentences:  This larger diameter allows a greater number of poles to be accommodated and when combined with complex slotting arrangements such as the Lorenz gauge condition or Guy slotting which allows the generation of frequencies from 1 to 10 kHz.As with all rotating electrical machines, high rotation speeds and small clearances are utilised to maximise flux variations.This necessitates that close attention is paid to the quality of bearings utilised and the stiffness and accuracy of rotor.