Development and application of measurement techniques for evaluating localised magnetic properties in electrical steel

Highlights: • A system is proposed for measurement of local magnetic properties. • The probe consists of needles and a Hall effect sensor. • Samples can be quickly measured across entire width. • Si content has a marked effect on flux density profile across sample. This paper reports the development of a measurement probe which couples local flux density measurements obtained using the needle probe method with the local magnetising field attained via a Hall effect sensor. This determines the variation in magnetic properties including power loss and permeability at increasing distances from the punched edge of 2.4% and 3.2% Si non-oriented electrical steel sample. Improvements in the characterisation of the magnetic properties of electrical steels would aid in optimising the efficiency in the design of electric machines.