The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The rotor bar current in an induction motor (IM) is usually assumed to be sinusoidal. However, it is found that the rotor bar current may become non-sinusoidal even if the stator windings are fed with a sinusoidal source. Influence of air-gap length on the rotor bar current waveform of an IM, which is designed by using the same geometrical and operational parameters as the Toyota Prius 2010 interior...
In order to minimize the cogging torque and torque ripple for surface mounted permanent magnet (SPM) machines, this paper proposes a C-core modular stator which can be obtained by inserting flux gaps (FGs) into every stator tooth. The electromagnetic performances of C-core modular PM machines such as open-circuit flux linkage, phase back-EMF, cogging torque and torque ripple, etc. are comprehensively...
This paper investigates the influence of magnet imperfections on the torque pulsation of permanent magnet machines having different pole/slot combinations (2p/Ns), including fractional-slot as well as integer-slot topologies. The magnet imperfections result in changing in the cogging period, which in turn might reduce the effectiveness of skewing, and also introduce new harmonic orders that could...
For fractional-slot PM machines with nonoverlapping windings, the influence of winding topology and the stator structure on torque performances are investigated in this paper. With the help of frozen permeability method, the on-load torque is separated into PM, armature current component and cogging torque, respectively. The major contribution of average torque and the causes of on-load torque ripple...
This paper presents analytically derived optimal 3rd harmonic into phase current waveforms to improve the output torque of five phase surface-mounted PM (SPM) machines with the constraints of peak and rms values. The output torque with the 3rd harmonic current is analytically established and the optimal value of 3rd harmonic injected into the current waveform for maximum torque improvement is analytically...
This paper investigates the torque characteristics of an 18-slot/10-pole fractional-slot surface-mounted permanent-magnet (SPM) machine and presents its comparison with conventional 9-slot/10-pole and 12-slot/10-pole SPM machines by analytical and two-dimensional (2-D) finite element analysis (FEA). The winding factors of the 18-slot/10-pole machine are firstly analyzed, and then, its back-EMF, average...
This paper presents a comparative study of the electromagnetic performance of 6-stator/4-rotor pole switched reluctance (SR) machines having AC sinusoidal bipolar excitation which is equivalent to salient-pole synchronous reluctance (SynR) machines having different non-overlapping concentrated winding connections, i.e. asymmetric, symmetrical and hybrid. The output torque of such machines is mainly...
AC synchronous reluctance machine (SynRM) or permanent magnet assisted synchronous reluctance machine presently receives a great deal of interest, since there is less or even no rare earth permanent magnet in the rotor. Most of SynRM machines employ a stator that is originally designed for a standard squirrel cage induction motor for a similar output rating and application, or the SynRM machine with...
This paper presents optimal rotor shape design to increase the torque capability in IPM machines by introducing optimal 3rd harmonic to the inverse cosine shaped rotor. The impact of the optimal 3rd harmonic to the rotor shape on the electromagnetic performance is investigated by finite element method. It is demonstrated that under the same amount of permanent magnets as the inverse cosine shaped...
The paper compares four analytical models, viz. relative permeance (RP), complex permeance (CP), subdomain (SD) based on single slot/pole and exact SD, for predicting electromagnetic performance of surface-mounted permanent magnet brushless machines. The RP model is simple, takes less computational time for predicting electromagnetic torque although modification is often required to account for fringing...
The significant influence of slot opening on the optimal stator and rotor pole combination and the electromagnetic performance of the flux-switching PM (FSPM) machine is observed and investigated in this paper. A new FSPM brushless machine with remarkable slot opening relative to the magnet thickness is developed to reduce the magnet usage and increase the slot area. Its stator slot opening is almost...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.