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Transverse flux machines can be a torque dense solution for applications requiring a relatively low speed such as electrically assisted bicycles or scooters. Common drawbacks include a high torque ripple caused by a high cogging torque and high back electromotive force harmonics. Cogging torque is of particular importance as it can be felt even when the system is disengaged and the bicycle is being...
Recently, outer-rotor electric machine become a research attention to be applied for in-wheel motor either in electric or hybrid electric vehicles (EVs). Among the competitor for in-wheel machines, the permanent magnet synchronous machine (PMSMs) with an outer-rotor have been used widely due to their high performances in terms of torque ad power. However, there is drawback cause by demagnetization...
Optimization plays a crucial role to bring out a trade-off between the cost and efficiency of permanent magnet motors. Optimization algorithm coupled with analytical magnetic circuit analysis, is one such technique to improve the performance of a motor. However, the non-linear effects like saturation, cross-magnetization, etc. are cumbersome to be modelled analytically. In addition, the interdependency...
Transverse Flux Permanent Magnet Motor (TFPM) was first introduced in the 1980's, it has a great potentiality in direct drive area for its low-speed-high-torque capability and high torque density. However, the larger cogging torque and flux leakage have restricted its popularization and practical utilization.
With the aid of genetic algorithm (GA), global optimization with multiple geometry parameters are feasible in the design of switched flux permanent magnet (SFPM) machine. To investigate the advantages of global optimization over individual one, which has been used extensively for the design of SFPM machines, the comparisons between two approaches are carried out at the fixed copper loss and volume...
This paper presents the design concepts and the test results of an electro-mechanical actuator for high-performance pump application. The rotating permanent magnet synchronous motor is integrated with the mechanical component in a rotating-screw architecture in order to minimize the total inertia. The motion trajectory fits the classical profile with high-torque at low-speed and low-torque at high...
Internal permanent magnet synchronous machines are spreading in industrial production. High torque density and extended speed operation range are key issues in many fields of applications. Many methods and design guidelines for cogging torque reduction exist in literature and this paper compares them. To this aim, the different design guidelines are applied to a reference machine to assess their effectiveness...
An optimal design procedure, based on Hooke-Jeeves method, applied to a permanent magnet transverse flux motor (PMTFM) is presented in the paper. Different objective functions, as minimum cost, minimum cogging torques and maximum efficiency were considered. The results obtained for a low power sample PMTFM are given and commented.
Low cost and low cogging torque are the most important aspects in the design of direct drive PM wind generators. In this paper a low cost PM wind generator with an irregular, parallel slotted stator is analysed with respect to cogging torque. The sensitivity of average torque and cogging torque to machine dimension variations are investigated. From this a method is proposed whereby regions of low...
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