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.
A short-stroke and large thrust axial magnetized tubular permanent magnet linear launcher (TPMLL) is presented in this paper. Its three-dimensional (3-D) finite-element (FE) models are established for sensitivity analyses on some parameters conducted to achieve greatest thrust. Then, its two-dimensional (2-D) FE models are also established. The electromagnetic thrusts calculated by 2-D and 3-D FE...
A novel biased flux permanent magnet (PM) machine (BFPMM) with doubly salient structure and PMs located in the stator back-iron is investigated in this paper. The stator is constituted by T-shaped laminated segments between which are placed circumferentially magnetized magnets of alternate polarity, and a concentrated winding is wound around each stator pole. The rotor has salient structure which...
This paper systematically presents the development of novel stator electrically field excited synchronous machines having salient pole rotors without any coils or magnets. This kind of new machines does not use slip-rings/brushes required in the conventional rotor wound field machines and combines the synergies of wound field machines, permanent magnet machines, switched reluctance and synchronous...
Memory motor has been researched extensively in the last decade due to its online magnetization capability. Among many types of designs, hybrid magnet memory motor (HMMM) has highest torque density. This paper investigates the cross coupling effect of HMMM in the motor topology proposed by Sakai. The analysis model is introduced firstly. Based on the magnetic circuit model, the mechanism of open-circuit...
Based on the traditional switched flux PM machine, a novel switched flux hybrid magnet memory motor is developed in this paper, which has extra low coercive force (LCF) magnets and magnetization coils. By changing the magnetization state of LCF magnets during operation, flux enhancing and weakening can be achieved without extra copper loss. The design considerations such as stator/rotor pole combinations,...
Novel topologies of switched flux permanent magnet (SFPM) machines with mechanically movable flux adjusters (FAs) for either all or alternative stator poles in order to extend the operation speed range are developed and analysed in this paper. Compared with the FAs which are located outside all of the stator poles of SFPM machines (all FAs), the alternative stator pole FA structure (alternative FAs)...
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 a comparative study of the stator frame torsional vibration induced in indirect- and direct-torque controlled permanent magnet brushless AC drives with non-sinusoidal back-EMF waveforms. An improved direct torque controller, which accounts for the influences of non-ideal back-EMF and cogging torque, is proposed. Its effectiveness in minimizing low order stator frame torsional vibration...
In this study, Nd2Fe14B thin films with perpendicular anisotropy at the thickness as thin as 5 nm have been successfully prepared. The suitability of the films as perpendicular magnetic recording media has been discussed. The films were characterized by X-ray diffractometry (XRD), vibrating sample magnetometer (VSM) with maximum applied field 24 kOe, and scanning electron microscopy (SEM). The chemical...
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.