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This article presents the results of the magneto-electric machine's research of the wind energy conversion systems' (WECS) alternating current. Calculation of the researched machine was carried out with the latest version of the programs "Elcut 6.2 Professional" complex using. The operation's purpose was creation of the researched object's adequate geometric model, obtaining the machine's...
A second-order integral flux observer (SOIFO-FLL) with dc component and harmonics attenuation capability is proposed for PMSM sensorless control in this paper. Due to the nonzero integral initial value, parameter mismatch, converter nonlinearities and detection errors, the estimated rotor flux by the conventional methods, pure integrator and low-pass filter (LPF) suffer the dc component and harmonics...
The basic spatial modulation effects of induction machines caused by slotting and saturation, have been analyzed for exploitation in speed sensorless control. With increasing load level, additional spatial harmonics arise, acting as disturbance and deteriorating sensorless control performance. In view of the fact, that induction machines for application in traction systems (e.g. public or cargo transportation)...
This paper investigates the torque production and the torque ripple reduction of 6-stator/7-rotor-pole (6/7) variable flux reluctance machine (VFRM). Based on the harmonic analysis, the instantaneous torque equation is firstly derived by considering the spectra of the armature inductance and current. The average torque is found to be mainly produced by the mutual inductances between the field and...
In this paper, we investigate the variation in characteristics of variable speed induction motors fed by inverters with grades of core materials used for stators and rotors from both results of measurement and finite element analysis. Identical shaped stator/rotor cores are manufactured by using several kinds of electrical steel sheets from low to high grades. Then, the characteristics of these motors...
In this paper, we investigate rotor and stator designs of interior permanent synchronous motors for variable speed/load applications to reduce the carrier harmonic losses caused by pulse width modulated inverters. The rotor core and magnet shapes are determined by an automatic optimization method using electromagnetic field analysis that considers the inverter carrier. Appropriate stator-winding configurations...
Due to the harmonics produced by inverter supply, the distribution characteristics of rotor copper and iron losses become more complicated in the inverter-fed induction motor (IFIM). To study the distribution characteristics of rotor copper and iron losses of the IFIM, we propose a new method to identify the harmonics of current density in the rotor bar and flux density in the rotor core using one...
In high speed systems, the recent trend is to couple the electric machine directly to the mechanical shaft, in order to avoid the use of a gear-box and to increase the overall efficiency and reliability. Surface Permanent Magnet mounted (SPM) machines are usually adopted in such systems for their high torque density thanks to rare-earth PMs. The cost of rare-earth PMs together with the risk of their...
This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS and DSSR AxFSPM machines have the same dimensions except for stator and rotor yoke lengths. 3-D finite element analysis (FEA) and experimental verification are used for the comparison study. The comparison results...
This paper presents a separation method to discern broken rotor bar fault from low frequency load torque oscillation thorough radial leakage flux spectrums in induction motors (IMs). Broken rotor bar fault can usually be detected using classical motor current based analysis (MCSA), but it may not provide reliable results since its performance depend on motor topology, stator winding and load type...
This research analyzes the vibration phenomenon in certain types of fractional slot permanent magnet synchronous machines that excites low order radial forces. The study utilizes a motor topology from the group having 12-stator slots and 10-rotor poles (12s10p) to identify and propose several design-based solutions to reduce vibration. Some electromagnetic design feature variations in the motor geometry...
In an Organic Rankine Cycle (ORC) systems, the Permanent Magnet (PM) generator is directly coupled to high-speed turbine shaft, in order to increase system efficiency avoiding introduction of gear-box. On the other hand, current time harmonics induce high frequency currents in rotor parts, which cause a temperature increase. PMs are strongly affected by the operating temperature, since both remanence...
For the control of electric motors, conventional inverters have utilized position and current sensors, but they undesirable in terms of cost and maintenance effort. For this reason, approaches without the sensors are developed by applying back electromotive force or signal injection-based method which also has some problems related to the the deterioration of control performance in low speed range...
Nonintrusive efficiency evaluation method based on the air gap torque and rotor slot frequency is generally used in industry application. However, this method has the following problems: 1) the number of rotor slots should be given in advance; 2) with some special number of pole pairs and rotor slots, the stator and rotor slot harmonics may be aliasing, which may lead to great errors in identification...
Multiphase induction machines (MIMs) are attractive for safety-critical applications, because they are able to operate under open-phase fault. On the other hand, algorithms for sensorless speed estimation improve reliability and decrease cost and maintenance. The approach based on rotor slot harmonics (RSHs) is especially popular, due to advantages such as its independence from time-varying parameters...
Permanent magnet synchronous machines (PMSMs) have been used in many applications due to their outstanding advantages such as high torque/power density, high efficiency, light weight and good reliability. However the emerging field of electrical traction gave arise to issues which were in general hardly considered in the past Yet, even though well established methods for eDrive control are available,...
Wound rotor synchronous machines have gained popularity as an alternative to permanent magnet synchronous machines and methods to improve the efficiency of these machines are continuously sought after. At the same time, non-overlap windings have gathered ground because of its associated lower cost and good torque density. However, non-overlap windings are also characterized by relatively high sub...
This paper presents analysis of cogging torque and torque ripple according to unevenly magnetized magnet patterns in permanent magnet synchronous motor. In previous studies it has confirmed that non-uniformly magnetized permanent magnet causes unexpected increase of cogging torque and torque ripple because of slot harmonic components. However, these studies investigated insufficient number of irregular...
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