This paper presents a new design and performance of single phase permanent magnet flux-switching machine (PMFSM) for electric bicycle application. 8Slot-12Pole design machine were choose by analyzing the highest power density value. All active parts such as permanent magnet and armature coil are located on the stator, while the rotor part consists of only single piece iron. PMFSM have a great advantage with robust rotor structure that make it much higher power and applicable for EV application compared to SRM and IPMSM. The design, operating principles, characteristics of torque, and power of this new topology are investigated by JMAG-Designer via a 2D-FEA. Size of motor and volume of PM is designed at 75mm and 80g, respectively. Based on the investigation, it can be concluded that the proposed topology of single phase 8Slot 12Pole PMFSM achieved the target of highest performance of power density, approximately at 0.113W/mm3 with reduced permanent magnet and size of design motor. Due to the low torque performance of this initial design, further works is ongoing to improve the torque performance. In future work, outer rotor PMFSM structure design will be presented and compared with the "Deterministic Optimization Method" to improve the initial design.
Abstract. Permanent magnet type motors (PMs) especially permanent magnet synchronous motor (PMSM) are expanding its limbs in industrial application system and widely used in various applications. The key features of this machine include high power and torque density, extending speed range, high efficiency, better dynamic performance and good flux-weakening capability. Nevertheless, high in cogging torque, which may cause noise and vibration, is one of the threat of the machine performance. Therefore, with the aid of 3-D finite element analysis (FEA) and simulation using JMAG Designer, this paper proposed new method for cogging torque reduction. Based on the simulation, methods of combining the skewing with radial pole pairing method and skewing with axial pole pairing method reduces the cogging torque effect up to 71.86% and 65.69% simultaneously. IntroductionFor the last decade, the demand of permanent magnet motors (PMs) with wide application prospect are receiving spotlight due to the advance development of high performance permanent magnet materials and manufacturing technology. In various PM motors, an interior-type permanent magnet motor (IPM) which magnet are inserted inside the rotor rather than bounding the surface shows better performances in flux weakening operation and achieve higher flux density due to the small air gap that allows to impose a magnetizing current effectively [1]. IPM motors are commonly used for industrial drives, electrical vehicle applications and generation systems as it has high element execution, and vitality change efficiency. However, due to PM air gap length, IPM create an extensive cogging torque issues.The cogging torque or also known as detent torque and 'no-current' is a famous issue, which happened in PM motors. The components of cogging torque are produce by the interaction PM and slotted iron structure, and shows itself by the propensity of a rotor to adjust in various stable positions even when a motor is not energized. This deteriorates the machine operation, performance of position control system, generating acoustic noises and vibrations, speed pulsations, harmonics distortion, and premature wear of the bearings during low speed [2]. The communications between PMs mounted on the rotor and anisotropy began by stator windings slots raised the cogging torque and variations of the magnetic field energy during the rotation, as indicated by [3]:
Permanent magnet flux switching machine (PMFSM) is a joint venture of switch reluctance machine (SRM) and permanent magnet synchronous machine (PMSM). It has become a prominent research topic for various applications because of robust rotor structure, high torque and power densities but few were developed for downhole applications mainly due to harsh environmental conditions. Formerly, most of developed PMFSMs for downhole applications were mainly concentrated on inner-rotor type design, and difficult to find research work on outer-rotor configuration. Therefore, this paper introduces the design and investigation of PMFSM with outer-rotor configuration for downhole application. Primarily, the geometric topology of proposed design is described in detail. Then, the no load and load analysis are implemented in order to investigate the initial performance of the proposed design.
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