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 resistance- or inductance-based saliency is needed as a prerequisite for signal-injection based encoderless position estimation methods. The differential quantities can be influenced by applying a short-circuited electrical winding on the rotor of an electrical machine. For a configuration that has been optimized in former research, 2D finite element method simulations are carried out. To be able...
In the paper, a non-linear 7th order dynamic model and a linearized 3rd order dynamic model of a synchronous generator connected to an infinite bus are presented and compared in details. Parameters and equations of the both models are explained and summarized. The presented models represent necessary starting point for work in areas of power system stabilizers' analysis, design and synthesis. Novelty...
An analytical method of inductance calculation for the two-layer spoke-type ferrite interior permanent magnet (IPM) machines is developed based on the equivalent magnetic circuit theory in d-q frame. FEA models are built to verify against the analytical method, and excellent agreement is achieved. Based on the verified inductance calculation, further studies on the influence of various design parameters...
The equivalent circuit approach has been widely exploited for the theoretical analysis of electromagnetic devices. However, in the field of classical wound-field synchronous generators, the presence of the damper cage complicates the analysis of such devices and the accurate prediction of the inherent induced currents is still matter of ongoing research. 12Focus is given to the accurate prediction...
This paper presents a multifrequency spiral vector model for both steady-state and dynamic performance analysis of the brushless doubly-fed induction machine (BDFIM) with a nested-loop rotor. Winding function theory is first employed to give a full picture of the inductance characteristics analytically, revealing the underlying relationship between harmonic components of stator-rotor mutual inductances...
This paper studies the influence of the design parameters on electromagnetic performance of permanent magnet ac motors with an exterior rotor having surface mounted magnet poles, and a stator having fractional slot concentrated windings. The study focuses on the quality of the back emf in terms of magnitudes and total harmonic distortion, and the torques developed in the motor. The electromagnetic...
The paper analyzes the transient reaction of squirrel cage induction machines to voltage step excitation. The involved excitation technique uses the drive's inverter to excite the machine with voltage steps. The transient nature of these steps demands high flux linkage derivatives. In response, the squirrel cage acts as a barrier hindering the flux to penetrate the rotor yoke and forcing it into the...
Due to the advantages of high efficiency, light mass and small volume, the flywheel based on brushless DC (BLDC) motor with ironless stator is widely utilized in the attitude control system of the micro-satellite.
This paper presents the comparison of the wound rotor, the nested-loop rotor and the reluctance rotor Brushless Doubly-Fed Generator (BDFG). Based on the finite element analysis and the experiment test methods, the performance characterization analyses are carried out, including the power winding (PW) voltage, the air gap flux density waveforms and the harmonic contents analysis of the corresponding...
The unique features of the synchronous reluctance machines such as fast dynamic response, simple rotor structure, and low cost have gained attention in recent years for many applications such as electric vehicles. In this paper the torque-angle curves of a synchronous reluctance machine which is designed and prototyped for traction applications are estimated using an analytical model. These curves...
As the prime mover of industrial machines, the three-phase squirrel-cage induction motor (IM) has been typically used. Consequently, further price reduction has been required. Although the price has decreased on account of its change from distributed winding to concentric winding, IM with concentric winding has not been adequately studied. Therefore, in this study, we have examined the potential of...
The miniaturization and high efficiency of permanent magnet synchronous motors (PMSMs) are desired in numerous applications. PMSMs have a number of design parameters in order to enable miniaturization and high efficiency. One such parameter is the ratio of the external diameter to the stack length (D/L). In this paper, we examine the effect of D/L on torque and efficiency in outer rotor surface permanent...
This paper presents a complete and improved analytical subdomain model for predicting the magnetic field distributions in surface-mounted permanent magnet (PM) machines accounting for tooth-tips and slotting effect, during open-circuit, armature reaction and on-load conditions. The model analytical derivations and field solutions are extended to overcome the shortcoming in previous subdomain model,...
This paper presents a specific design process of a high-torque direct-drive in-wheel permanent magnet synchronous machine (PMSM) using concentrated winding and grain oriented (GO) silicon steel teeth for a hybrid All-Terrain Vehicle (ATV) application. Mechanical specifications and constraints of an off-road application are first demystified. An analytical design model, considering magnet flux and...
Among the Permanent Magnet (PM) machines, the Interior PM (IPM) machine is proposed, despite of a strong non linear behaviour and a complex design, as a good candidate thanks to its interesting peculiarities, i.e., higher torque in flux-weakening operation, higher fault-tolerance, and ability to adopt low cost PMs. A second trend in designing PM machines concerns the adoption of fractional-slot (FS)...
The paper deals with the design and analysis of a low voltage high current switched reluctance machine used for small automotive applications. The design procedure is based on a numerical algorithm, validated later in simulations and measurements. The idea of the paper is based on designing a switched reluctance machine (SRM) used for driving a wheel chair for people with physical disabilities. The...
This paper presents an analytical model for predicting the open-circuit, armature reaction, and load eddy current loss in the conductive retaining sleeve of surface-mounted permanent magnet machines accounting for slot opening and tooth-tips. The finite element results confirm the high accuracy of the developed model and the necessity of accounting for the slot opening. The load sleeve loss is equal...
In many applications that use IPMSMs, the miniaturization of the motor is desired from the viewpoint of space saving and manufacturing cost reduction. To achieve this miniaturization, it is necessary to make the motor's torque density and power density high. In this paper, the influence of the ratio of the outer diameter to the stack length (D/L) on the maximum torque and power in IPMSMs is examined...
A serial of Translational Meshing Motors (TMM) have being developed recently, but it is a multivariable, strong coupling and highly nonlinear system which has lots of difficulties to model and Analysis. A simpler and quite accurate model based on finite element method is presented to analyze the nonlinear characteristics and dynamic characteristic of motor in this paper. The geometry structure, electromagnetic...
This paper presents analysis of the torque harmonics characteristic on Permanent Magnet Synchronous Motor (PMSM) according to ratio numbers of slots and poles. Various PMSM were selected to with different numbers of slots and poles to compare the torque ripple. The electromagnetic characteristics of each model are analyzed by FEM(Finite Element Method). And the harmonics of torque ripple was analyzed...
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.