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Pulsating mode of asynchronous motors operation is finding wide application in various electric drives. In this regard, the problem of creating mathematical models of a pulsating mode, taking into account the real factors, becomes urgent. These models will allow to optimize the process of designing of the pulsing actuators based on asynchronous motors. The article describes mathematical models of...
This paper is focused on the design of Axial Flux Permanent Machine (AFPM) tailored for low-speed high-torque applications. In particular, the design procedure is developed starting from a tooth concentrated winding topology; given its high reliability, this is an optimal solution in the context of electric torsional damping applications, where high torque values and good dynamic performance are required...
A mathematical model to study changes in the energy parameters of a submersible electrical motor (SEM) through rotor pack parameters variations has been completed. Resistance variations influence coefficients of rotor pack short-circuited winding PEDN (SEMI)32–117 to power losses in the pack as well as efficiency and SEM air gap torque were determined in the Mathematica software. The worst-case energy...
This paper presents an indirect rotor-field oriented control (IRFOC) algorithm for symmetrical six-phase double-winding induction machines with four three-phase sub-winding sets. The presented algorithm introduces the ability to control the power flow between different sub-winding sets. Multiple three-phase induction machines are utilised for critical applications such as more-electric aircrafts,...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
Induction machines with double-star stator winding configuration, has extend the redundancy capability of the FEP based ship propulsion systems. However, under winding faulty conditions, the presence of negative sequence torque components introduce torque pulsations which are responsible for the torsional vibration stress. The classical Field Oriented Control (FOC) scheme approach, has a PI controller...
This paper deals with the study and implementation of a losses minimization control method for an integrated multi-drives topology used to interface a multi windings induction machine to more storage units in hybrid electric vehicle parallel drivetrains. The main target is to optimize the management of multi-directional power flows, by reducing the power losses in the induction machine as well as...
This paper proposes three novel dual-stator flux-modulated permanent magnet (DSFMPM) machine concepts, which are particularly suitable for direct-drive applications with the virtue of their high torque density and low operation speed. The dual-stator configuration can help improve the use of inner cavity space, and achieve higher torque density comparing with the single-stator counterparts. Moreover,...
When availability is synonym to safety in the context of automated driving, redundancy is mandatory. But how much redundancy is necessary and sufficient? This paper proposes a holistic approach in building safety relevant systems leading to suppression of unnecessary redundancies. A case study for an electromechanical steering system is conducted. The interaction of the steering system with other...
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...
A novel 4/4 stator/rotor single-phase doubly salient permanent magnet machine (DSPMM) with asymmetric stator poles is proposed in this paper. The stator poles of proposed machine are distributed non-uniformly along the circumference of the stator yoke. Firstly, it investigates the new topology and operation principle based on diagram description and mathematical derivation. Then, the dimension equation,...
This research examines the vibration and thermal characteristics of double-sided flux concentrating Transverse Flux Machines (TFM), designed for direct drive application. Two TFM prototypes with different stator cores, one with Quasi U-Core and the other with E-Core, has been used for the study. 3D Finite Element Analysis (FEA) has been carried out to determine the no-load and with load performance...
Synchronous reluctance machines are very appealing for high speed traction applications due to their robustness, simple structure, absence of magnets, and simple control. The absence of magnets means that synchronous reluctance machines are not susceptible to price variability and sustainability of rare-earth materials. Also, there are no concerns about demagnetization or uncontrolled generation mode...
In this paper a prototype brushless doubly-fed reluctance machine is investigated which is aimed a meeting commercial machine performance figures. The machine has 4 and 8 pole 3-phase stator windings and a 6 pole radially-laminated ducted rotor. The machine is investigated using finite element analysis (FEA), static torque tests with DC current excitation, a MATLAB/Simulink model, and experimentally...
This paper proposes a modulated model predictive control (MMPC) algorithm for a brushless double-fed induction machine. The Brushless Doubly-Fed Induction Machine has some important advantages over alternative solutions for brushless machine applications. The proposed modulation technique achieves a fixed switching frequency, which gives good system performance. The paper examines the design and implementation...
Because of the advantages of simple and robust configuration, high reliability and low cost, the doubly salient electromagnetic motor (DSEM) has a broad application prospects in high speed areas. Core-loss predication is an important issue in the design and analysis of electric motors, especially in high speed application. However, because of the serious uneven distribution and local oversaturation...
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...
This paper describes a simple ripple compensation method of suspension force and torque in a bearingless surface-mounted permanent magnet (SPM) motor with two-phase integrated winding configuration. Only two H-bridges or eight power transistors are used for the proposed topology. The neutral point of each phase is connected to the middle point of the power sources to superimpose the suspension and...
To produce an ultralightweight machine for electric aircrafts, we propose a machine in which electrical energy is converted between the stator and the rotor via magnetic resonance coupling (MRC). This action causes electromagnetic resonance between the multiphase windings of the stator and the cage bars of the rotor. Electromagnetic resonance coupling technology allows electrical machines to convert...
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...
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