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The design of superconducting machines requires a knowledge of the magnetic characteristics of non-oriented soft magnetic materials at low temperatures. Therefore the performance of the electrical steels has to be examined under the given temperature constraints. This report shows that operating the steel at low temperature leads to increased iron core losses and an increased relative permeability...
The goal of this paper is to investigate a proposed novel dual-rotor hybrid synchronous machine using two different types of rotors, i.e. the synchronous reluctance (SyR) and surface permanent magnet (SPM) rotors. Conventional design of dual-rotor machine utilizes SPM rotors on both inner and outer sides with toroidal winding configuration. However, there are limitations of using the permanent magnet...
Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different...
The purpose of this paper is to investigate both the torque ripple reduction technique and influences of mechanical tolerance on the performances of a novel dual-stator 6/4 flux-switching permanent magnet machine. To minimize the torque ripple, step skew designs are studied to determine the optimal step number and step skew span angle. In addition, three common rotor mechanical tolerance deviation...
SiC power MOSFETs are an advancement in the power electronics technology today available on the market. Respect to Si-based power devices, they offer potential for higher operating temperatures, higher breakdown voltage with low on-state resistance, and lower switching losses permitting much higher switching frequencies. To date, the attempts to apply the SiC power devices to the field of AC drives...
A general method for the optimal flux selection in multiphase induction machines is proposed in this paper. The multiphase machines are configured as multi three-phase units. The proposed algorithm allows computing the optimal flux for the Maximum Torque per Ampere (MTPA) operation in both normal and open-winding fault conditions. The results of the proposed method can be applied to many different...
This paper addresses the heat transfer coefficient associated with a shaft-cooling of traction motors. In such shaft-cooling systems, the 50–50 ethylene glycol-water is made to flow through the shaft hole in order to cool the machine. The heat transfer coefficient is estimated using a computational fluid dynamics(CFD) method, where the effect of the rotational velocity as well as the liquid flow rate...
Electric Submersible Pumps are a widespread industrial solution for artificial lift applications in oil industries. Linear motors are becoming more popular as they are applied for new applications in various fields. Integrated Drive-Motor technology shows many promising advantages. In this paper, a system which combines these three technologies for marginal oil wells application is discussed. This...
In high speed electric machines, stator slots are wide opened for an easy Litz wire coil insertion. Often, to avoid excessive rotor losses due to open slots, magnetic wedges are used. During operation these magnetic wedges can get loose and brittles. With the accumulation of iron powder on the end windings (overhangs), it can lead to a total failure of the stator and the interruption of the process...
Conventional mechanical and hydraulic systems have been rapidly replaced by electromechanical systems. The demand for electric motors has significantly increased for automotive parts. Nowadays, there are various types of permanent magnet synchronous motors (PMSMs) applied to automotive chassis applications such as steering systems, electric boosters, electromechanical brakes, and more. The electric...
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...
A synchronous reluctance motor drive exhibits an inherent unlimited speed range capability. In order to exploit this peculiar characteristic of the drive while assuring the lowest power losses, a proper control algorithm has to be used. In particular, while the working speed is increasing, the control must be able to command the reluctance motor under the maximum torque per ampere condition at first,...
This paper studies the magnetic stress and vibration characteristic of the permanent magnet assisted synchronous reluctance machine (PM-SynRM). Firstly, the frequency and spatial orders of radial stress are investigated by analytical equations. Then, two PM-SynRMs are designed, and their open-circuit and armature magnetic stresses are calculated by finite element method (FEM) and compared with the...
This paper proposes a novel production method for improving productivity of the integrated power-pack on EPS (Electric Power steering) systems. The proposed method mainly has effectiveness for mass production of combined motor-inverter system using the axial-type position sensor. Using the proposed method, the absolute position value is identified and synchronized between controller and sensor so...
Utilizing GaN (Gallium Nitride) DC-DC converter for speed control of BLDC (Brushless DC) Motor is investigated in this paper. The proposed system replaces the well-known Si-based switches by GaN FETs which are faster by minimum ten times and much compact that it recedes the size of Switched Mode Power Supply (SMPS) application. The contemplated system uses a GaN-based DC-DC Resonant Converter to drive...
The acoustic noise of an external rotor Surface Permanent Magnet Synchronous Machine (SPMSM) is studied using a multi-physical analytical methodology. The magnetic radial forces are calculated from the field solution, which is obtained through numerical conformal mapping, using Maxwell stress tensor. Applied on the rotor at the air gap location, these forces excite the rotor plus housing system and...
The paper deals with the accurate flux map modeling of synchronous reluctance motors through finite element analyses. By comparing 2D-FEM simulations results with measured flux maps on real machines, non-negligible discrepancies were initially observed, in particular under heavy saturation and cross-saturation conditions. Conversely, the 3D FEM-based flux mapping offers more accurate estimations of...
This paper describes the effect of alternative power conversion techniques on the performance of a Linear Alternator driven by a Joule Cycle-Free Piston Engine for electrical power generation. The design of a tubular Longitudinal Flux machine with axial magnets is performed using 2-D axisymmetric FEA modelling with transient solver to extract the rated power for three power conversion scenarios: Resistive...
This paper presents a decoupled current control based on disturbance observer applied to sensorless induction machine drives. The algorithm for rotor speed estimation is obtained from the observed disturbances used in the current control loop. An adaptation law for the estimated rotor speed derived from the disturbance observer is proposed to feedback the rotor speed control loop. The stability analysis...
This paper presents a fault tolerant control proposal for a single Open Phase Fault (OPF) in a three-phase Permanent Magnet Synchronous Motor (PMSM). The mathematical model of the motor under open single phase is presented and its disturb to current, flux and torque are evaluated. The presented method is based on the Finite Control Set Model Based Predictive Control (FCS-MPC), and it is compared to...
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