Speed controlled single spindle drives for textile machines

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 the 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.