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.
Multi-degree-of-freedom systems are used in industrial robots and humanoid robots. These systems are composed of a lot of motors, gears, and links, and these make the systems complicated. In order to make the systems simple, there have been many researches that can produce multi-degree-of-freedom motions using 1 actuator. In this paper two types of 2-DoF actuators are proposed. The operating principles...
The paper is about the design of a synchronous reluctance motor for the general purpose applications. The design will be particularly on the rotor side and a multi parameter approach will be used to reach a design layout. 4 pole, 2,2 kW machine have designed and manufactuaed. At B beginning the design the rotor parameters are examined and considered in terms of manufacturing limits as well. The parameter...
In the present paper an analytic procedure for the preliminary design of a High-Speed ferrite-based Brushless DC Machine (HS-BLDC) has been proposed. In particular, a mechanical and electromagnetic modeling has been developed in order to take into account their mutual influence in the definition of the geometry of the electrical machine. In addition, suitable design targets have been imposed in accordance...
This document demonstrates a conceptual study, design and development of unconventional electromagnetic actuators for applications where a high torque over a limited part of a rotational turn is required. The unconventionality of the actuators is that the electromagnetic actuation is applied directly on a high ratio transmission gear such as a cycloid disc in a cycloid drive or a flex-spline in a...
This paper comprehensively investigates the voltage distortion (i.e. terminal voltage ripple) mechanisms in surface-mounted permanent magnet (SPM) machines equipped with a single layer fractional slot concentrated winding (FSCW). Stator flux gaps can be used in FSCW machines to increase the pitch factor and hence the winding factor, as well as to simplify the manufacturing process. Furthermore, they...
This paper deals with the analysis of fractional-slot PM assisted synchronous reluctance motors. The configurations considered here refer to high-torque low-speed applications, so that a relatively high number of poles is adopted. As well-known, this is a drawback for synchronous reluctance motors. The aim of this paper is to illustrate how different design techniques influence the performance of...
The size of installed offshore wind turbines is continuously growing every year in an attempt to make this technology more cost-effective. Following this trend, the main challenge for wind turbine manufacturers is to reach the 10 MW power level. However, present topologies of electric generators may have prohibitive mass and volume when designed for such a high power application. In this paper an...
The dovetailed spoke interior permanent magnet (IPM) electric machine rotor has gained popularity over the past few years. The first machine prototype of this type was a design with NdFeB magnets. This rotor topology limits the magnet leakage flux associated with IPM designs that use the lamination structure to mechanically support the magnets and rotor structure by eliminating the need for magnetic...
The eddy current induction in a conductive medium with finite width and thickness due to a moving magnetic rotor is studied. The presented formulation is based on the second order vector potential and the magnetic scalar potential and takes into account the magnetic field interaction through the edges of the conductive medium. The eddy current fields as well as thrust, lift and lateral force created...
To improve the dynamic performances of a 2-poles small single phase brushless permanent magnet motor (SP-BLPMM), suitably shaped auxiliary PM (APM) are proposed in the paper. The electromechanical model of SP-BLPMM — integrated in a small pump application without APM — is then preliminary assessed by the experimental data elaboration. Afterwards, the benefits due to the APM are analyzed by both preliminary...
An increasing interest in both efficient electrical machines and more extensive control strategies demands evermore faster simulation tools. One of the modeling techniques that meets this demand is Fourier-based modeling. However, even Fourier-based models may encounter problems related to CPU usage. To cope with these problems the authors present three simple techniques to reduce the computational...
Analytical calculation of the operating performance of induction machines requires exact knowledge of the leakage inductances in both the stator and the rotor. In contrast to the flux coupling within the iron core where flux paths are two-dimensional and predominantly determined by permeabilities of different magnitudes (iron core vs. air gap/slots), thus making it easy to separately calculate main...
The inductances play an important role in the behavior of the interior permanent magnet (IPM) Machine. This paper investigates absolute, differential inductances as well as d- and q-axis inductances for different rotor structures and positions. It also analyses the saturation of the inductances at different current magnitudes. The AC and mixed current standstill tests are applied in the experiments...
This paper deals with the characterization and construction of a rotating brushless PM exciter intended for synchronous generator excitation purposes. Traditionally, PM exciters are used as pre-exciters in synchronous generator excitations systems. In order to reduce the number of components and to increase the step time response of the system, a PM exciter is designed as an outer pole PM machine,...
This paper describes a novel axial flux permanent magnet (AFPM) biased eddy current brake (ECB). Structure, principles of operation and benefits of the proposed AFPM-ECB compared to conventional ECBs are presented. A non-linear magnetic equivalent circuit based design model is generated for the proposed AFPM-ECB. Detailed 3D finite element models (FEM) are created to see more accurate breaking torque...
Saturation effects in the magnetic active iron areas lead to odd air gap harmonics in electrical machines. Whereas the influence of tooth saturation is analytical described by a flattening factor, the impact of yoke saturation is neglected by this factor so far. Finite element analyses are done in order to receive the air gap harmonics. The simulations are performed with high permeability material...
Rotor bar current of an induction machine (IM) designed by using the same stator outer diameter, stack length, air-gap length, output power and rated speed as the Toyota Prius 2010 interior permanent magnet machine is investigated. It is observed that in some cases the rotor bar current waveform can be non-sinusoidal even if the stator windings are fed with a sinusoidal source. The conditions for...
Hard Ferrite Assisted Synchronous Reluctance Machines (FASRM) with 6, 8 and 10 poles are analyzed and compared in terms of torque production capability and quality along the entire torque/speed envelope, converter rating and capability to withstand transient short-circuit demagnetizing field. A generic low computational time analysis tool was developed. Medium sized personnel vehicle traction requirements...
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...
In order to be competitive, companies aim at improving their technologies in terms of production process simplification and reduction in the overall price of products. However, the use of lower-cost materials and a simpler construction can often degrade the machine performance. One of the possible production process simplifications of electrical machines is the use of modular permanent magnet synchronous...
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.