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 a simple and computationally efficient algorithm for mapping magnet loss within field-orientated controlled surface-mounted brushless AC PM machines over a wide range of operating conditions. Induced eddy current loss in rotor magnets can be a significant proportion of the overall loss and should not be overlooked when analysing thermal behaviour and efficiency over the required...
Photovoltaic (PV) powered electric water pumps are becoming popular in remote rural locations due to the non-availability of grid connectivity. A typical PV based drive scheme consists of a PV array, DC-DC converter, inverter-fed induction motor and a water pump. Induction motors are rugged in construction and offer low maintenance but their efficiency is poor at low power levels. Therefore, permanent...
The Field Oriented Controlled algorithm needs accurate estimation of motor state variables in order to ensure full torque and power performance. Good control results are strongly related to parameter values used by observers or estimators' algorithms, which vary according to the machine working conditions and the temperature. The most important parameter is the rotor resistance. The paper shows and...
In this paper a virtual model for DC motors with single tooth windings and mechanical commutation is presented. The model permits the calculation of the physical values which are otherwise not measurable during actual motor operation while considering the non-linearity of a magnetic circuit. Coil values (current, voltage, flux linkage) and motor values (current, voltage, speed and torque) are both...
The paper is concerned with practical modelling of the synchronous generator (SG) as the main component of the hydroelectric power plant. The generation system under study comprises the hydraulic circuit, the speed regulator, the excitation system and the SG. Each system component is formatted into state form. The SG state model developed with field voltage as the only controlled input variable and...
This paper presents a 2D analytical method based on subdomain model for the computation of magnetic field and electromagnetic performances in spoke-type interior permanentmagnet motor (IPM) topologies. The conventional spoke-type IPM rotor is constituted with ferrite permanent magnets magnetized in tangential direction. To maximize the torque density, auxiliary ferrite magnets magnetized in radial...
Electrical engineers rely on analytical models to design industrial induction motors for different customer driven applications. These models are fundamental and do not naturally consider additional core losses due to stamping or welding or the impact of being inverter-fed. To overcome the resulting gap between analytic results and measurement data, these equivalent circuit models are traditionally...
This paper deals with deep bar effect in squirrel cage rotors. Induction machines using this type of rotor are widespread. Some cages enhance the deep bar effect to improve the starting performances. In cited references, the analytical calculation of the equivalent circuit parameters has only been investigated for single-cage and double-cage rotors. In this paper, an analytical model is developed...
This paper presents an electromagnetic analytical model for a Permanent Magnet Assisted Synchronous Reluctance Motor (PMA-SRM). The proposed model is based on the Maxwell equations: Ampere's theorem and the flux conservation law. The stator and rotor magnetic saturation are considered, as well as the effect of the magnetic bridges of the flux barriers. The goal is to compute the motor performances...
90 kW frequency converter driven synchronous reluctance machine losses are determined simultaneously with the input-output powers and with the calorimetric method. Uncertainty of both measurement methods is analyzed and discussed. Calorimetric measurement system that is capable to determine the losses of the motor frame size up to 315 is introduced.
Computation of the transient behavior of wound-field synchronous generators typically focuses on the stator currents. Appropriate models to compute these currents have been derived. However, the calculation of the transient voltages and currents in the field winding of such machines-as for example required for the design of the components of a brushless exciter (diodes, resistance)-requires this model...
Core losses in an electrical machine vary depending on the type of material, frequency and flux density. Loss prediction using pulsating models is insufficient for estimating core losses in a machine since it does not take into account rotational core losses. Moreover the superposition of pulsating losses in the radial and tangential direction overestimates losses especially at higher flux densities...
Previously, a variable speed vernier magnetic gear was proposed. In this paper, the vernier magnetic gear is combined with a generator to produce a continuously variable speed vernier magnetic geared generator. Combining the generator with the gear has the advantage of making use of space harmonics that are not contributing to the operation in a useful way. Also, this way the overall amount of material...
Electric powered bicycles have been making their way into the world market for few years now. Typically DC, brush-less DC and PMSM motors are used as traction motors in electric bicycles. This paper describes finite element modeling and analysis of low cost ferrite based permanent magnet motor. This motor is intended to be used as traction drive in an electric assisted bicycle. The electric drive...
A modular 4 phase Switched Reluctance Motor (SRM) for an electric two wheeler is designed. Conventional 4 phase SRM suffers from low frequency torque ripple due to asymmetric mutual coupling between adjacent phases. Therefore, a modular stator and rotor structure is proposed which eliminates mutual coupling between adjacent SRM phases. Since the structure needs 3D flux capability, Soft Magnetic Composite...
In this paper, with the application of an electric vehicle traction drive, the design optimisation of field-intensified permanent magnet machines is considered and explained. Two rotor types are considered in the design optimisation namely a simple salient-pole rotor and a rotor with internal flux barriers. The optimisation algorithm used is explained in detail and optimised machine structures are...
Nowadays, a great effort is done to find new alternative renewable energy sources to replace part of nuclear energy production. In this context, this paper presents a new axial counter-rotating turbine for small-hydro applications which is developed to recover the energy lost in release valves of water supply. The design of the two PM-generators, their mechanical integration in a bulb placed into...
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.