*Article*

### **Parameter Estimation of Inter-Laminar Fault-Region in Laminated Sheets Through Inverse Approach**

**Osaruyi Osemwinyen 1,\*, Ahmed Hemeida 2, Floran Martin 1, Anouar Belahcen 1 and Antero Arkkio 1**


Received: 1 June 2020; Accepted: 19 June 2020; Published: 23 June 2020

**Abstract:** Estimating the additional power losses caused by an inter-laminar short circuit in electromagnetic devices using thermal measurements depends on many parameters such as thermal conductivity, heat capacity, convective heat coefficient, and size of the fault points. This paper presents a method for estimating these parameters using experimental measurement and a numerical model. The surface temperature rise due to inter-laminar short circuit fault was obtained using an infrared camera. Based on the initial temperature rise method, the least square non-linear approximation technique was used to determine the best fitting parameters of the fault region from the numerical model. To validate the results obtained, the fault region temperature rise and the total loss of the experimental sample were compared with the numerical model using the obtained parameters for different current supply conditions. The study shows that surface temperature distribution can be used to estimate the inter-laminar short circuit fault parameters and localized losses.

**Keywords:** fault size; inter-laminar fault; localized losses; thermographic measurement; thermal-electric coupling
