Abstract
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.
Highlights
The development of electric vehicles (EV) and hybrid electric (HEV) has been driven in recent years by the desire to be more environmentally friendly
The needle probe method works by calculating the voltage between two points on the surface of a sample, with the measured voltage assumed to be proportional to the rate of change of the flux density within the sample, between the needle tips
An experimental system was proposed for the non-destructive identification of the variation in local magnetic properties with the simultaneous measurement of the localised magnetising field and flux density of electrical steel rings
Summary
The development of electric vehicles (EV) and hybrid electric (HEV) has been driven in recent years by the desire to be more environmentally friendly. Requirements by governments and consumers for decreases in carbon emissions, improvements in air quality and reduced reliance on fossil fuels has placed an onus on motor manufacturers to improve the fuel efficiency of their vehicles and subsequent reduction of exhaust gas. One method of achieving this in HEVs is through improvement of the efficiency of the EV’s traction motor. Few materials satisfactorily weigh the different requirements for an electric motor more economically than non-oriented electrical steel (NOES). The laminations, used in motor cores are largely produced by punching from NOES sheets
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