Iron Loss Calculation in a Claw-pole Structure.pdf

Industrial Electrical Engineering and Automation Lund University, Sweden Iron Loss Calculation in a Claw-pole Structure Avo Reinap David Martinez Mu?oz Mats Alaküla In du st ria l E le ct ric al E ng in ee rin g an d Au to m at io n ? Avo R Iron loss calculation in a claw-pole structure Objective ? Core loss calculation in a claw-pole structure – Estimation of magnetic loading MEC vs. FEM – Estimation of magnetic losses according to B locus ? Core loss model verification – Core loss measurement of a single-phase claw-pole motor ? Optimal size for the claw-pole structure In du st ria l E le ct ric al E ng in ee rin g an d Au to m at io n ? Avo R Iron loss calculation in a claw-pole structure Construction of the motor ? Magnetring – plastic bounded ferrite (PA12); – lateral polar magnetization; ? Claw-pole halves – soft magnetic composite (Somaloy500+LB1); – A progressive radius of the claw-poles causes difference between the rest positions and a starting torque; In du st ria l E le ct ric al E ng in ee rin g an d Au to m at io n ? Avo R Iron loss calculation in a claw-pole structure Core loss formulation ? Loss separation – The formulation is the same for an alternating and rotating field ? Hysteresis loss – Rate of change of energy used to affect magnetic domain wall motion ? Eddy-current loss (classical eddy currents) – Due to induced currents flowing in closed paths within magnetic material ? Anomalous loss – Eddy current loss due to magnetic domain wall motion anomalouseddyhysteresiscore PPPP ++= In du st ria l E le ct ric al E ng in ee rin g an d Au to m at io n ? Avo R Iron loss calculation in a claw-pole structure Core loss calculation ? On the basis of the variation and location of magnetic loading the specific core loss can be predicted ? Magnetic loading evaluation is based on – Magnetic Equivalent Circuit (MEC) – 3D Finite Element (FE) modeling; ? A posteriori core loss prediction approach ? The hysteresis l