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 puts forward a cylindrical staggered- sheet structure Tubular Linear Step Motor. The structure and operating principle are introduced. Magnetic equivalent circuit modeling is developed, and the air-gap permeance is formulated, the nonlinear equivalent magnetic circuit equation for the Tubular Linear Step Motor is obtained through mesh flux method. Finally, Dynamic magnetic circuit for the...
A 12/10 flux-switching permanent magnet motor (FSPM) is described. Qualitative analysis of magnetic circuit indicates that a connection between stator segments is benefit to motor operation. From the basic principle of flux-weakening speed-extension operation, weaken magnetic factor and speed-extension multiple are calculated. The analysis results show that this kind of motor has higher flux-weakening...
The stator flux observer is a key part in the method of Direct Torque Control (DTC). However, the accuracy of the stator flux estimation directly affected the performance of DTC. The traditional induction motor stator flux observation method have been analyzed in This paper. And for the Shortcomings of existing methods, a on-line identification methods based on Radial Basis Function(RBF) have been...
Non linear control of the squirrel induction motor propelling an Electric Vehicle (EV) is designed using sliding mode theory. The proposed scheme uses an adaptive flux and speed observer that is based on a full order model of the induction motor in the indirect vector-controlled drive. The sliding mode tools allow us to separate the control from these two outputs torque and flux. To take account of...
Interior permanent magnet-synchronous machines (IPMSM) feature many favourable properties for e-mobility application as high power density and good efficiency. However, they require careful modelling because of strong anisotropies of the rotor, as they are also known from salient-pole synchronous machines. These anisotropies are often accounted for by different values for the d-axis and q-axis inductances...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
The current confluence of energy needs, enhanced environmental awareness and technical developments has led vigorous global efforts toward making wind power a key component of renewable and sustainable energy resources. The conventional wind generators are induction machine types having small and limited wind power production and high cost per unit. Large wind plants involving interior permanent magnet...
Permanent magnetic gear (PMG) is a new kind of non-contact power transmission device which has unique advantages to be applied in the situations of airproof and small vibration requirements. A new kind of large torque permanent magnetic gear box with flexible transmission ratio is introduced in this paper. Research on principle analysis and transmission characteristics were carried out on the basis...
The focus of this paper is to improve self-sensing performance of interior permanent magnet synchronous machine (IPMSM) by modifying rotor configurations. Field intensified IPMSM (FIIPMSM) is designed by adding flux barriers in the rotor of an IPMSM. In comparison with IPMSMs, FIIPMSMs have the advantage of decoupling saturation-induced saliency, cross-coupling effects and also secondary saliencies,...
The parameters of permanent magnet synchronous motors consists of flux leakage coefficient, direct-axis synchronous reactance, quadrature-axis synchronous reactance and the ratio of two synchronous reactance. They all can influence the performance of permanent magnet synchronous motor such as pullout torque, pull in torque and starting torque. The calculated accuracy of the parameters above mentioned...
Taking a two-pole high-speed permanent magnetic synchronous generator (PMSG) as an example, the mathematic and physical models with generator eccentric are established. This paper presented two different methods to calculate the magnetic field distribution and unilateral magnetic force (UMF) in the whole calculating region. And then analysis of influences of the eccentricity, load current and harmonics...
This paper deals with design criteria and characteristics analysis included electromagnetic losses analysis of a high-speed permanent magnet synchronous motor for a 7.5-kW, 60-krpm class centrifugal air compressor. In order to design this machine, we introduced analytical techniques, such as the electromagnetic transfer relations theorem and equivalent magnetic circuit method. And, from the curve-fitting...
Multi-consequent-pole bearingless motors can be used in low speed rotating and swinging stages (or platforms) under specific conditions. A test machine has been designed and built and in this machine two axes of freedom are actively controlled in the radial x-y directions. The suspension windings are of a novel toroidal shape, i.e., they are wound around the stator yoke. This produces a low axial...
To study the performance of line start permanent magnet motors, this paper investigates two typical rotor designs which have different magnet arrangements, including the interior-magnet rotor and the surface-magnet rotor. The transient and steady states of these motors are calculated by using two-dimensional finite-element analysis. Characteristics such as flux distribution, efficiency, and loading...
Halbach array as a new type of magnet array had been highly attached importance to since it was proposed. The application domain of PM motor was greatly widened because of excellent performance of Halbach array magnets. The Halbach array PM motor has many merits such as simple structure, light weight and low loss. In this paper, Halbach array magnets are classified and analyzed according to magnet...
In this paper, a novel 2-degree-of-freedom hybrid magnetic bearing is presented which the static bias magnetic flux is produced by polarized permanent magnet ring and control magnetic flux is produced by currents in control windings. The mathematical models are deduced based on the introduction of working mechanism of hybrid magnetic bearing (HMB). A practical prototype bearingpsilas parameters are...
At present, structure design and performance optimization are the key points in the study of brushless doubly-fed machine (BDFM). By using ANSYS software, the finite element method (FEM) models of BDFM were established. These models have different rotor structures that are reluctance rotor with magnetic barriers, cage rotor with nested shorted-circuit windings, reluctance rotor with salient poles,...
Hybrid excitation synchronous machine(HESM) combines the characteristics of permanent magnet machine and wound field synchronous machine. A novel coordinate structure HESM is proposed and implemented in this paper. The architecture and operation principle of the novel HESM are presented. To predict the electromagnetic performance more accurately, 3D-FEA model of the HESM is built, and finite-element...
In Part II a comparative analysis of the different brushless PM motor configurations, including exterior and interior rotor arrangements, salient and non-salient surface-mounted PM rotors, concentrated and distributed armature windings is presented. The comparative study is based on the developed design methodology given in the Part I of this paper. These motor configurations are investigated to be...
This paper proposes a novel doubly salient machine. The topology of the machine is described. The flux within the air gap of the novel doubly salient machine is excited by both permanent magnets and field coils. The current of the field coils can be regulated to strengthen or weaken the flux level in the air gap. Therefore, the output voltage of the machine can be controlled easily. The method of...
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.