Dynamic and Steady state Improvement in Axial Flux hysteresis Motors(AFHM) Considering Rotor Configuration

Abstract

In high speed axial flux hysteresis motors, rotor material & rotor holder have the main roles for producing of steady state torque and dynamic torque respectively. Also it is clear that minimum air gap can cause to better motor performance in steady state. In conventional AFHM -and especially in the high speed AFHM types- the rotor holder is placed between the hysteresis ring(rotor) and stator to make more induction(dynamic) torque in time of starting. So exchange of the rotor place and rotor holder place can be useful despite the fact that simulation and experimental results show worse motor dynamic response. For resolving this issue a thin copper ring is used at the rotor bottom to improve the induction torque and consequently motor dynamic response. Then some experimental set ups are provided and AFHM results in all cases are measured.