| Abstract |
A novel surface motor with permanent magnets and coreless armature structure has been studied, which will be suitable for a small actuator used for two-directional drive and precise positioning. For such a surface motor two-dimensional extension of the Halbach array of permanent magnets is considered. FEM analysis has been carried out to study the fundamental characteristics of the motor and the Halbach-like permanent magnet array. The analysis results show that when the distance between adjacent N and S poles of permanent magnets is 7.5 mm, the Halbach-like permanent magnet array that is higher than 2mm can generate a higher magnetic field than a normal 2-dimensional array of permanent magnets. It is found from these results that a Halbach-like two-dimensional array of permanent magnets is effective for a coreless PM surface motor. In addition, there is an optimum value for the width of each permanent magnet for a designed gap length. |
