CALCULATION OF THE ROTATIONAL POWER LOSS IN ELECTRICAL STEEL LAMINATIONS FROM MEASURED (H)OVER-RIGHT-ARROW AND (B)OVER-RIGHT-ARROW

An expression is derived for the calculation of the rotational power loss in electrical steel laminations, ie the iron loss associated with the torque caused by the angle of lag between (H) over right arrow and (B) over right arrow It is shown, that for a non-purely rotating flux density, i.e. non-circular flux density loci, the instantaneous angular velocity of the flux density vector can vary substantially during a cycle, and must be accounted for in the calculation.