Influence of the winding variant on the operating behaviour of PM synchronous motors in the field weakening range

Abstract:
The modular principle can be used to develop smaller-size main spindle motors on the basis of existing AC servo motors that feature forced ventilation or liquid cooling. With this in mind, the aim is to use as many components from the existing AC servo motor as possible, including the rotor active part with surface mounted magnets, for example. As main drives typically exhibit a distinct constant power range up to the maximum speed, the rotating field stator must be optimally adapted for field weakening. This paper takes the example of a design study to investigate how the selection of stator winding system influences steady-state performance and, notably, the field weakening range.