Design of a Low-Power Direct-on-Line Synchronous Reluctance Motor Based on the Modified Natural Flux Line Curve Approach

A direct-on-line synchronous reluctance motor (DOLSynRM) with a rotor topology defined by the natural flux line curve approach is studied as an alternative to induction (IM) using 1.5 kW, 50 Hz example. If IM stator used, direct squirrel cage replacement equipped damper winding might not guarantee sufficient starting performance. To ensure strong enough capability, was modified in design. The proposed applied optimization of DOLSynRM genetic algorithm. results show clear tendency design when trying achieve reliable capability and maximize steady-state performance DOLSynRM. Both diameter optimized are different from those corresponding IM. prototype built tested. It showed about 5.4%-unit higher efficiency than original acceptable under rated load condition. capabilities motors study considered loads. locked apparent power current stay below permissible limits both