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This paper proposes a direct torque control strategy for a brushless dc (BLDC) motor with a single sided matrix converter (SSMC) for an electrohydrostatic actuator system in aerospace application. A hybrid two- and three-phase switching mode is applied to minimize torque ripples during commutation. A six-phase SSMC is investigated and the simulation results are presented. Compared with current hysteresis...
Ideal Hall sensors installation interval is 120° electrical angle, however, the inevitable mechanical installation error may cause Hall signals delay or advance, aggravating seriously electromagnetic torque ripple. This paper presents a novel compensation method for commutation torque ripple reduction of Brushless DC motor (BLDC motor) with misaligned Hall sensors. First of all, by comparing phase...
This paper deals with the sensorless direct torque control (DTC) scheme for the permanent magnet synchronous motor (PMSM), where a new estimation algorithm is developed based on the polynomial chaos theory and the extended Kalman filter (EKF) for the sensorless obtaining of the rotor speed, stator flux and electromagnetic torque. The proposed estimator can effectively deal with parametric uncertainties...
Based on the fact that the three-phase induction machine proves higher performance under six-phase supply, which was demonstrated in Part 1 of the paper, this work investigates the fault-tolerance capability of the six-phase structure with asymmetrical configuration (30° phase shifting both for space and time conditions). It is taken into discussion the cut-off of one, two and three phases respectively...
High performance drives with induction machines require use of vector control. The direct torque control and field oriented control are nowadays two most applied vector control methods. The main advantage of the method for direct torque control of induction machines is its simplicity and therefore its robustness. Namely, control variables (the electromagnetic torque and stator flux vector) are estimated...
The paper describes the design and the experimental validation of an electric naval propulsion system with rim driven propeller. The electric naval propulsion system is submerged in water providing an effective cooling for the electric machine and thus achieving a high power density. The proposed slotless design of the permanent magnet (PM) machine allows a convenient way to protect the motors' active...
In this paper, a simple and robust speed estimator and Pseudo Derivative Feedback (PDF-PDF) controller are proposed for sensorless PMSM drive to improve its performance at standstill and low speed regions. The speed estimator is formed using stator flux and electromagnetic torque based model reference adaptive system, which performs better during transient conditions and reduces steady state error...
In this paper an application of artificial neural controller for compensation of torque ripple in electrical drive with PMSM (Permanent Magnet Synchronous Motor) is presented. Due to cogging torque, electromagnetic torque ripple and also, current measurement error of the motor, are created a ripple of angular velocity, finally. This parasite phenomenon influence on the precision of control, especially...
Progress in field of electrical machines diagnosis and artificial intelligence contributed to increased interest in new methods of diagnosis in field of electrical motors. The paper focused on three numerical techniques: finite element analysis, signal analysis and artificial neural networks in diagnosis of a squirrel cage induction machine under inter-turn short circuit in stator windings. A field-circuit...
This paper presents a model of a complex electromechanical system based on a new type of electromechanical converter — a field regulated reluctance machine (FRRM). The problem of optimal regulation of a multiphase electromechanical converter is formulated according to the criterion of minimum costs for the installed power of an electric drive and a semiconductor converter. The second task of optimizing...
Vibration analysis is one of the most successful techniques used for condition monitoring of rotating machines. Vibration analysis is a very efficient and convenient tool for diagnosing mechanical problems in induction motors. The aim of this paper is to show that vibration analysis is an efficient tool for diagnosing electromagnetic problems in induction motors, which are very specific for this type...
The paper deals with a full sliding mode approach for induction motor drives direct torque and flux control. The proposed solution is composed by an integral sliding-mode control and by a speed-sensorless sliding mode observer. The suggested Integral Sliding-Mode Direct Torque Control (ISMDTC) is formulated in the stator flux reference frame, without employing current regulators. The adopted sliding...
Piezo-electric motors are interesting candidates and a good alternative solution to electromagnetic actuation. A limited number of mechanical components is required which leads to simple and compact designs. A high resolution and repeatability can be reached. They do not generate noise nor magnetic fields which make them easy to integrate in different environments. Nevertheless, some limitations remain...
In this article, a salient synchronous machine starting up process is emulated, and the simulation is carried out in MATLAB/Simulink. The dynamics of the simulation model include the three-order electromagnetic dynamics and two-order swing dynamics without the normal operation assumption. The model is derived based on the space vector concept and two-axis theory. Torque generation is also explained,...
The low-efficiency design method of traditional motor usually needs a long time, so Cloud Computing is introduced for the traditional FEM and BP neural network to reduce the time consuming. In this paper, the electromagnetic axial torque of permanent magnet synchronous motor (PMSM) is used as calculation case. The utilizing Cloud Computing curtails approximately 4 times hour to calculate this case...
Recently, redundancy permanent magnet synchronous motor (PMSM) is widely applied in aviation. To improve the reliability of redundancy PMSM, the short-circuit current should be restrained via anti-short-circuit design. For the further optimization design of redundancy PMSM, it is essential to research the influence of anti-short-circuit design on the PMSM performance. Therefore, in this paper, two...
The electromagnetic arresting gear is one type aircraft arresting gear. It's electromagnetic force can be adjusted precisely, and it is an important safeguard that it arrests the aircraft veering off the runway and ensures the aircrafts safely landing. Arresting cable is an essential part of arresting gear, and its performance has a significant impact on arresting process. This paper studies the dynamics...
In recent years, as the price of rare-earth permanent magnet fluctuates dramatically, the less-rare-earth interior permanent-magnet synchronous machines (LRE- IPMSMs) used for electric vehicles (EVs) have received more and more attentions. LRE-IPMSMs combine the features of high power density in permanent-magnet synchronous machine (PMSM) and low cost in synchronous reluctance machine (SynRM), which...
The electric vehicles become increasingly popular duo to their characteristics of energy efficiency and environmental protection. The motor used in the electric vehicles is usually the permanent magnet synchronous machines (PMSM). In recent years because of the price fluctuations of the rare earth, the less-rare-earth interior permanent-magnet synchronous machine (LRE-IPMSM) has attracted more and...
This paper presents a technique to reduce electromagnetic torque ripple of an IPMSG with fractional-slot, concentrated-winding which is connected to a rectifier and a boost converter. Firstly, the generator was controlled using DC current control of the boost converter. The generator torque ripple with this conventional method was found as 29.7% of rated torque which is significant to cause generator...
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