A new outer-rotor flux switching permanent magnet generator for wind farm applications

Abstract

In this paper a 1.5 kW flux switching permanent magnet (FSPM) generator is presented for direct drive small scale wind turbine applications. For maximizing induced voltage and the output torque while minimizing cogging torque and unbalanced radial magnetic force (UMF), the proposed machine exhibits a new 6/19 stator pole/rotor teeth number and an outer rotor configuration. At first, in the paper an analytical design has been developed, then a finite element method (FEM) analysis is carried out for validating the analytical procedure and for design improvement. The simulation results extracted by FEM confirm the theoretical analysis procedure and help in the understanding of the performance analysis of the machine against the variations of the design variables. Furthermore, an experimental laboratory prototype of the proposed FSPM is implemented to confirm the analytical design and FEM modelling approaches. A comparison of induced voltage, torque, UMF and cogging torque produced by different FSPM configurations present in literature respect to the proposed generator has been developed. The results show the goodness of the adopted methodology and prove that, because of suitable electromagnetic performance of the proposed FSPM generator, it could be counted as a proper candidate for small scale wind turbine applications.

Design Optimization of a Permanent-Magnet Flux-Switching Generator for Direct-Drive Wind Turbines

“…Instead of a traditional synchronous machine with permanent magnets on the rotor, the flux-switching machine can be considered as a valuable alternative to use in direct-drive applications due to its increased torque capability [7][8][9][10]. In addition, in this case, inexpensive permanent-magnet materials can be applied [10].…”

Review of Control Topologies for Flux Switching Motor

“…• Good disturbance rejection capability with reduced torque ripple With these objectives under consideration, different configurations of FSM are under research to support applications like hybrid electric vehicles [5], [6], [7], [8], [9], [10], [11], [70] locomotive traction [12], [13], [14], downhole [15], wind energy conversion systems [16], [17], [18], [19], [71], aerospace [20], [21], elevator [22] and household appliances [23], [24], [25], [26]. Although there had been many advancements in the design of FSM, researchers started to explore controller algorithms for FSM only after the year 2008 [30].…”

Performance modifications and design aspects of rotating flux switching permanent magnet machines: a review

“…All harmonic orders can be eliminated using (15), except those with the order equal to multiples of n dsq . A relatively novel technique to reduce the cogging torque in FSPMs, which is not as much effective as the previous ones, is to apply the asymmetric design approaches, including asymmetry in stator slots, stator teeth, stator PMs, rotor slots, and rotor teeth [65].…”

“…In recent years, numerous publications on FSPMs demonstrate a great tendency in both academia and industry towards their utilisation in different applications such as automotive industry [9][10][11][12], wind power [13][14][15][16], downhole pumps [17,18] and aerospace [19,20].…”