International Journal of Engineering Research ISSN:2319-6890)(online),2347-5013(print) Volume No.5, Issue No.9, pp :758-761 1 September 2016 IJER@2016 doi : 10.17950/ijer/v5s9/907 Page 758 Modelling of Permanent Magnet Axial Flux Synchronous Machine and Its Application to the Wind Energy Conversion A.Pravalika 1 , Mr. V. Ramesh Babu 2 Dept of EEE ,VNR Vignana Jyothi Institute of Technology, Hyderabad, Telangana, India pravalikaachugatla08@gmail.com, rameshbabu0506@gmail.com Abstract: This paper presents the Modeling and Simulation of Axial Flux Permanent Magnet Synchronous Machine for Single and Double Stator configurations. It proposes the AFPMSM to be used in Wind Energy Conversion System as the replacement of conventional induction generator. The MPPT technique is incorporated to extract the maximum power and the comparison of output powers with and without MPPT is presented. Keywords: Axial flux permanent magnet synchronous machine, modeling, TSAFPMSM, MPPT, MATLAB I. Introduction Based on the direction of air gap flux, the energy conversion rotating electric machines are broadly classified into Radial flux machines and Axial flux machines. Off-course the operating principle is same, but the construction is different in both the machines. In Radial flux machine conductors are parallel to the shaft and air gap flux is perpendicular to shaft axis whereas in axial flux machine the arrangement is just opposite. In 1821, Faraday invented a primitive disc motor which was in the form of an Axial Flux Machine(RFM). However, since 1837, when Davenport claimed the first patent for a RFM, it became the accepted configuration for electrical machines. Since 1980 the applicability of axial flux machines to low-speed, direct- drive electrical drive applications has been found [i]. In Axial flux machine rotor has disc shape and stator of ring structured. The active part to produce the torque is the radial length from stator inner radius to the outer radius and it is dependent on flux density in the stator and rotor yokes. It is independent of number of poles. Because of the having higher pole number it is attractive for the applications of low speed and high torque. The adoption of Axial Flux permanent magnet synchronous Machines in Wind Energy Conversion Systems exploits the advantages: The gear box of single stage is enough so that the cost and weight of the system reduce [ii]. Further, it decreases the friction and wind age losses and hence the system efficiency increases. And also the power output gets enhanced twice for the same turbine rotor diameter with the use of twin stator axial flux permanent magnet synchronous machine. II. Modeling of Axial Flux Permanent Magnet Synchronous Machine (AFPMSM) A) Single Air Gap AFPMSM: The single air gap flux permanent magnet synchronous machine consists of one stator and one rotor. The equations which describe the performance of permanent magnet synchronous machine are independent of magnetic flux. The system equations of an axial flux permanent magnet synchronous machine in matrix form are given below. (1) The above equations are expressed in a simplified way as …… …..(2) The generalized d-q axes models are used for analyses of machines. The voltage equations of single air gap flux permanent magnet synchronous machine are Where Where p represents the differential operator Equation (2) can be represented in StateVariable form as ……… (5) The above equation can be solved in MATLAB using Runge- Kutta method to obtain d-q currents of both stator and rotor currents. Fig.1. Stator currents of AFPMSM The electromagnetic torque obtained by …….. (6)