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Linear permanent magnet machines (LPMMs) are widely used in the industrial field for its high-performance of position accuracy, acceleration, deceleration, and tracking characteristics. In addition, LPMMs have no transmission error and backlash owing to the direct drive system. However, the direct drive system is easily affected by disturbance. If the system contains several LPMMs, the movement of...
Maximum efficiency of induction generators is a significant issue of renewable energy applications since resource is limited and sometimes because of expensive technology. This paper presents a modeling method of iron, copper and mechanical losses in an induction machine based on the design of experiments and Taguchi orthogonal plans. The model involves several parameters such as rotor speed (slip),...
This paper presents a direct torque control drive system utilizing constant switching frequency controller (CSFC) with EKF based speed estimation. By employing CSFC instead of the conventional hysteresis controller, the torque ripple is reduced and constant switching frequency is achieved, and more importantly, the simple structure of DTC without any modification to the look-up table is maintained...
Observers are used in relation to several controllers: IFOC, sensor-less drives and for fault detection but they have not been used yet for predictive control of drives. This paper shows the benefits of incorporating a rotor current observer to enhance the predictions needed for predictive control of stator currents in VSI driven IM. The new scheme is compared with the standard one in which non-measurable...
This paper presents the cascaded doubly fed induction generator as a potential candidate machine for electrical power generation in embedded aircraft applications. HVDC network is considered. The machine is connected to a diode bridge rectifier. The set operates as a stand alone DC generator connected to an isolated load. A new decoupled vector control is proposed to regulate the DC bus voltage. The...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
This paper presents detailed analysis of the DFIG-based wind energy conversion system(WECS) under three-phase voltage dips conditions via a coupled simulation. 1.5MW DFIG is modeled in Ansoft-Maxwell, and the simulation is coupled with Ansoft-Simplorer and Matlab-Simulink for drive circuit and controller implementation. The coupled simulation system including DFIG, RSC, GSC, DC-Link, step up transformer,...
Induction motor drives supplied from diode front-end rectifiers are commonly used in industrial applications due to their low cost and reliability. However, the two-quadrant operation of such a topology makes the regenerative braking impossible. Braking resistors can be used to dissipate the braking power and provide enhanced braking capability, but additional hardware is then necessary. Alternatively,...
With regard to small DC brushless motors the problem of the cogging torques amplitude is considered. At the aim a special motor prototype, obtained by the substitution of the original ferrite magnets with bonded magnets prepared in the own laboratories, has been realized; such a prototype assumes the role of "reference motor" as regards some quantities introduced as "quality factors"...
This paper deals with control of three-level neutral point clamped (NPC) voltage source converters (VSCs) for medium rating doubly fed induction generator (DFIG) based off-grid wind energy conversion system. A three-level three-leg insulated gate bipolar transistors (IGBTs) based NPC-VSC is used as a rotor converter (RC). Four-leg three-level IGBTs based NPC-VSC is used as a load converter (LC). A...
This study presents a numerical and experimental study on the effect of permanent magnet tolerances on the performances of a Tubular Linear Ferrite Motor. The statistical distribution of the magnetic characteristic of a set of commercial magnets is obtained experimentally while the performances of a the tubular motor are numerically evaluated. The performances that have been considered are: cogging...
In this paper, a new hybrid-excited flux-switching (HEFS) machine is proposed with the outer-rotor configuration, which possesses the distinct feature of fault-tolerant operation. Comparing with the conventional permanent-magnet (PM) machine, it combines merits of flux control, high mechanical integrity, and low-cost. Furthermore, its fault-tolerant feature ensures its continuous operation in the...
High efficiency, low cost and high reliable electrical machines are designed to meet very demanding specifications for a wide range of applications. The SynchRM (Synchronous Reluctance Motor) has very interesting properties and features. One of the main advantages is that the motor can be designed without rare earth materials permanent magnets. In this article, a modelling method of such machines...
Optimization plays a crucial role to bring out a trade-off between the cost and efficiency of permanent magnet motors. Optimization algorithm coupled with analytical magnetic circuit analysis, is one such technique to improve the performance of a motor. However, the non-linear effects like saturation, cross-magnetization, etc. are cumbersome to be modelled analytically. In addition, the interdependency...
In complex industrial situations, modern permanent magnet synchronous motor (PMSM) servo drive system always face different kinds of disturbances, especially constant or slowly-varying disturbances (load disturbances) and periodic disturbances (torque ripples). Conventional disturbance rejection techniques, e.g., the extended state observer based control (ES-OBC) and the disturbance observer based...
In this paper, the circuit model of the parallel connected induction motors driven by single inverter is established. According to the circuit model, the problem of unbalanced electromagnetic torque caused by the wheel diameter difference of the parallel connected motors is analyzed. The weighted vector equation of the parallel connected motors is established. To improve the control performance with...
At standstill and low-speed, signal-injection methods are required to estimate the rotor position of a permanent magnet synchronous machine (PMSM). Therefore, usually either the resistance- or inductance-based saliency is examined. Although the latter case can be found most in literature, it is possible that the sensorless performance can be improved by exploiting the position information of both...
In this paper, the work has been developed aiming at reduction of inverter non-linear influences on high frequency carrier voltage injection sensorless control algorithm. For this method, inverter non-linear errors introduce distortions of the motor stator voltage that degrade the estimation performance. The main cause is the deviation of the high frequency voltage vector angle used for the demodulation...
Direct Torque Control (DTC) technique has been applied in recent times in high performance five-phase induction motor drives during the normal operation of the system. The use of DTC in the multiphase area is far from becoming a reality because it has not been used in competitive multiphase applications where the fault operation needs to be considered. The authors have successfully tested the ability...
The drive performance of permanent magnet synchronous motor (PMSM) can be deteriorated due to various disturbances. In this paper, the problem of speed control for a PMSM system with parameter uncertainties is investigated. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is proposed, where the controller is developed for speed regulation. Compared with conventional...
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