In the past, electrical single spindle drives have been rarely used in textile machines. Only spindles with high power requirement - e.g. cabling machines - are provided with inverter fed induction motors. In case of spindles with smaller power requirements - for example ring spinning machines - the classical belt drive still dominates.
This report describes the development of an economic electrical single spindle drive for textile machines. In addition to manufacturing costs, the demands for a high degree of efficiency and exact speed control have to be considered.
A comparison of different electrical motors - and the associated frequency converters - shows the advantages of a brushless DC motor design. The rotor position sensing of the described brushless DC motor spindle drive can be realized without sensors by monitoring the motor voltages.