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This paper describes the design and prototyping process of outer rotor permanent magnet generator meant for the use in small scale wind turbines. The initial design of the machine is presented. Main issues and phenomena, affecting the generator design, such as cogging torque and its reduction possibilities, selection and demagnetization risk assessment of permanent magnets, machine losses and thermal...
This paper presents a closed-form design optimization of surface permanent magnet (SPM) machines using concentrated windings layout. Over the last few years, the interest in the use of SPM machines with a high pole number for low speed direct-drive applications has significantly increased. In this paper, the analytical design model is developed and particle swarm optimization (PSO) is applied for...
The permanent magnet synchronous machine with an external rotor is the most important device for high-performance electrical drive systems in particular for hybrid electric vehicles. The paper presents finite element analyses of a such a machine in terms of a comparison of both Y- and Δ-connected stator windings. Thereby, the unknown zero sequence current with the Δ-connected stator winding has to...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper discusses finite element analyses of such a machine with concentrated tooth coils in terms of a comparison of both Y- and Δ-connected stator windings. As the evolved electromagnetic torque is one of the most...
The three-phase flux reversal machine (FRM) is a double-salient stator-permanent magnet machine with flux Linkage reversal in the stator three-phase concentrated windings. However, there is notable PM flux leakage caused by its structure in flux reversal machine. This flux leakage deteriorates the performance of the FRM. In order to reduce the flux leakage, the researchers propose different improved...
In direct-drive electric propulsion systems, where there is no reduction gear to minimize and absorb the adverse effects due to cogging torque generated by the permanent magnet (PM) machine, minimization of cogging torque generation is of particular importance. In this paper, a novel axial magnet pole pairing method is proposed to minimize cogging torque generation in a special three-phase outer-rotor...
Several cogging torque minimization techniques exist for permanent magnet (PM) machines, and these are well documented in earlier studies. However, the majority are used to reduce the cogging torque in radial flux PM (RFPM) machines. In this paper, cogging torque minimization techniques for axial-flux PM (AFPM) disk machines are briefly reviewed, and one of the foremost cogging torque minimization...
A low-speed double disks type permanent magnet synchronous machine is proposed. The electrical machinepsilas stator slot number is close to the rotor permanent magnet pole number and the statorpsilas tooth width is close to a pole distance. The coils that belong to each phase are concentrated and wound on consecutive teeth, so that the end winding is minimal and the phase windings do not overlap....
A new type of three-phase permanent magnet synchronous machine (PMSM) with modular stator structure is proposed. Its structure and principle is introduced. The machinepsilas teeth width is equal to polar pitch, its stator winding is concentrated winding, each phase winding is wound up continuously and the ends of windings are shorter then conventional machines. Therefore, the machinepsilas efficiency...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
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