In wind turbine generating systems, Axial Flux Permanent Magnet Synchronous Generators (AFPMSG) are becoming increasingly popular due to many advantages they offer. Nevertheless, these machines suffer from the so-called cogging torque resulting from the interaction between the permanent magnets and the slotted armature. Not only it causes noise and vibration, this cogging torque affects the selfstart ability of wind turbines at low wind speed. Therefore, the aerodynamic torque •generated by the rotor blades should overcome the cogging torque anytime during the operation otherwise the wind ...

The purpose of this thesis is to design and test a device that measures the electrical parameter sofa certain material. This device can have different applications, like assisting in land mines detection, agricultural or construction purposes. In order to measure the electrical parameters, this device or probe uses two wideband planar dipole antennas that operate in the frequency range between 3 and 6 GHz. The transmitted signal between the antennas, (S21), is measured and then compared to a database obtained by simulating different materials using the Finite Difference Time Domain Method. Based ...