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.
This paper presents the design and analysis of a novel machine family of Slotless Permanent Magnet Brushless DC motors (PMBLDC) for precise positioning applications of spacecrafts. Initial design, selection of major parameters and air gap magnetic flux density are estimated using the analytical model of the machine. The proportion of the Halbach array in the machine was optimized using FE to obtain...
This paper examines torque ripple, cogging torque, and radial forces in permanent magnet synchronous motors (PMSMs). Effect of slot number on electromagnetic torque (including cogging torque), and radial forces has been analyzed in different PMSM configurations having the same envelop dimensions and output requirements. Finite element technique is used for computation of the machine characteristics...
The paper proposes a study of synchronization capability of line-start permanent magnet synchronous motor with small saliency ratio and very high cage resistance. The exemplified method is for a motor with the rated power of 3.5 kW, the synchronous speed of 3000 rpm, and the saliency ratio of 1.08.
The macro air-gap element and its torque formulation were proposed earlier by Abdel-Razek et al. for modeling electrical machines with an annular air-gap. This paper extends the existing formulation for force calculation in the finite element model incorporating a two-dimensional Cartesian macro air-gap element. The new formulation can be useful for force or torque calculation of some special electric...
The paper proposes a design strategy to reduce torque ripple in interior permanent magnet synchronous motor (IPMSM) with concentrated winding. Authors propose there ideas of design strategy. The first is to choose the combination of poles number and slots number which minimizes the torque ripple. The second is the decision of pole arc angle by trapezoidal waveform approximation of the air-gap magnetic...
Low-speed flux-modulated (FM) motor, which violates the conventional design rule and has different number of pole pairs in the stator and rotor, is examined. In the original FM motor, the magnetic flux is modulated using special iron segments in the air gaps. It has the merit of having high power density at low speed. In this paper an improved structure of the FM motor which has only one air gap between...
This paper deals with several methods for the reduction of cogging torque in case of low speed permanent magnets wind generators. The first analyzed method consists in asymmetrical spacing of the permanent magnets on the rotor outer surface. The second method consists in using close stator slots that determines a nearly isotropic magnetic stator structure. The last investigated method consists in...
The motor performances such as torque characteristics or iron loss are strongly affected by the magnetic properties of electrical steel sheet used. It is found recently that, even in the non-oriented electrical steel sheets, the magnetic characteristics are dependent on the direction of the applied magnetic field, i.e., the non-oriented electrical steel sheet has two-dimensional (2D) magnetic properties...
High performance motor drive applications require smooth torque with minimum torque ripple. This paper is focused on identifying various design parameters in stator and rotor that can be used in reducing the torque ripple of a sinusoidally excited permanent magnet (PM) brushless DC (BLDC) motor. The paper investigates the sensitivity of various design parameters on torque ripple and torque linearity...
The line-start permanent magnet synchronous motor (LSPMSM) attracted a considerable attention because of the higher value of the product between the power factor and the efficiency. The paper proposes an analytical design method for the LSPMSM, considering the asynchronous starting and the synchronous steady state parameters. Using this theoretical approach, all the synchronous and asynchronous starting...
A new concept of three-phase permanent-magnet synchronous motor with rotor embedded starting squirrel-cage is presented. The rotor has been equipped with ring shaped inner permanent magnets axially-magnetized and placed between consecutive claw poles built as ferromagnetic modular pieces. The start and the steady operation of the manufactured prototype have been experimentally tested. Results such...
This paper presents a hybrid excitation synchronous machine which combines a permanent magnet excitation with a wound field one. With two sources of flux, this kind of machines is cited more and more frequently in vehicle application for easier control of flux. After a brief description of the structure, some methods will be presented to improve the performances of this machine. Simulation results...
Permanent magnet (PM) machines are capable of high efficiency, high power density and extremely wide power operating range. With these characteristics there has been considerable interest in applying them for motion control and robotic applications. Due to their high efficiency, PM machines are ideal general drives in many consumer goods to reduce energy consumption and improve performance. This paper...
This paper illustrates a general design process used for implementing non-overlapping concentrated windings in an interior permanent magnet (IPM) machine for field weakening applications. This design process was verified by finite element analysis (FEA) of a 18-slot, 14-pole model. The optimization process of torque and field weakening performance resulted in a design with thin inter-pole link sections...
Due to their simplicity, robustness, high performances and reduced cost, the variable reluctance machines (VRM) occupy today a place of choice in the electromechanical conversion of energy. Hence the growing interest for the study and the design of a new structures more successful and better adapted to the new requirements. The purpose of this paper is to propose a useful and comprehensive design...
This paper proposes a method of characteristics calculation for permanent magnet synchronous machines (PMSMs) using static finite element analysis (FEA) and steady-state dq-axis equations. The method calculates characteristics such as torque, voltage, current, inductances, etc. under any balanced steady-state load conditions. Various types of input condition can be selected to identify the load condition...
An error estimation technique based on the L2 error norm is implemented in this paper for magnetostatic finite-element analysis. Convergence of both the global and local errors are used as indicators. The air gap is refined based on the rate of change in the calculated force and consists of layers. Results that highlight the accuracy of the combined methods for cogging torque calculations are displayed...
The paper briefly presents the fundamentals of the mathematical models theory of the synchronous machine in the general case. In the end one obtains on this basis quantitative data of interest for estimating a given dynamic process. The results also give qualitative information that present scientific interest regarding in special the dynamic processes at synchronization, the oscillations of the rotating...
This article deals with the presentation of an experimental bench dedicated to the teaching of electromechanical systems during undergraduate curriculum. This bench permits to explain the main principles of an elementary synchronous motor by a practical approach of the physical phenomena. At first, students start to describe theoretically the motor based on the fundamental electromagnetic relations...
This work deals with the development of a complete analytic model for a surface mounted permanent magnet synchronous machine. Magnetic field in the air-gap, electromagnetic torque and induced electromotive force EMF are represented as sum of spatial-temporal components. Furthermore, parameters of the single phase equivalent circuit are obtained also in the same way. The proposed analytical model takes...
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.