Abstract
This paper presents an improved design of an electromagnetic Halbach array that can be used as the transmitter of the wireless power transfer system for enhanced performance. An electromagnetic Halbach array consists of five coils, i.e. one base coil and four side coils forming a transmitter cube. Superposition of the magnetic fields generated by these five coils results in a stronger magnetic field in half of the cube. When the receiver coil is placed in the strong magnetic field half, higher power transfer efficiency can be achieved over longer transmission distances. It was found in the simulation that the magnetic field of the base coil distributed more densely in locations near its centre. Therefore, the proposed design moves the side coils closer to the centre of the base coil. It was verified in the ANSYS magnetostatic simulation that this method is able to increase the magnetic field strength of the electromagnetic Halbach array. Furthermore, co-simulation of ANSYS Maxwell and Simplorer has proved that using the improved electromagnetic Halbach array as the wireless power transmitter, higher power transfer efficiency is obtained when the receiver is placed inside the strong magnetic field half of the transmitter cube.
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