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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)...
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 addresses the design of a novel model-based control method for modern multi-mega-watt wind turbines using output regulation control scheme. The objective is to alleviate the extreme and fatigue loads on the moving components of the turbine structure (e.g., turbine tower, drivetrain, blades) whilst maximum energy is harvested from the approaching wind. The preview wind field information...
In this paper we present a new approach to closed-loop control design which provides generation of regular or chaotic oscillations in a dynamic systems. Proposed approach is based on idea of introduction of desired attractor (boundary circle or strange attractor) in closed-loop system state space. The practical usage of this approach for the problem of nonlinear oscillations generation in DC electromechanical...
Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
Droop control is generally used to realize power sharing without communication lines. VSG (Virtual Synchronous Generator) is a control method that mimics both steady-state droop and dynamic characteristic of SG (Synchronous Generator) to enhance inertia of microgrid. In this paper, the comparison of different damping effect forms in VSG control is given firstly to draw conclusions: For the aspect...
Structural defects in the rotor cage of large electrical machines significantly impact their expected operational lifetime. This work simulates the stresses developed in a damaged rotor cage during different transient profiles and for different sizes of the imperfection. A combined model featuring electrical, thermal and mechanical stages as well as three different meshes reflecting a progressing...
This paper presents a model predictive power control (MPPC) scheme for the brushless doubly fed twin stator induction generator (BDFTSIG). State-space equations of the BDFTSIG, in terms of power winding (PW) current, control winding (CW) current, and PW flux, is specifically derived. A complete power model, which clearly reveals the relationship between power and the applied voltage vector, is then...
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 proposes a comprehensive approach for the multi-objective design optimization of switched reluctance machines (SRMs). An analytical model that predicts the electromagnetic (EM) behaviors of SRMs with arbitrary geometries, materials or current profiles is first developed and validated by its finite-element analysis (FEA) counterpart in terms of various performance indices. Then, a hybrid...
This paper deals with a robust input-output feedback linearization control technique for induction motors. The idea arises from the observation that classic feedback linearization suffers primarily from two disadvantages: the accuracy of the dynamic model and the corresponding correct knowledge of the model parameters. To cope with the limit of the feedback linearization control, intrinsically connected...
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...
This paper presents the design and a novel rotor shape of a 3 kW, 25000 rpm permanent magnet assisted synchronous reluctance motor (PMa-SynRM) based on a low speed benchmark model. Multiphase PMa-SynRM can operate with low torque ripple, reduced magnet volume and extended field weakening region which makes it a potential candidate for high speed motor design. However, the challenge of high speed PMa-SynRM...
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...
The thermal analysis of the end space region of an electrical machine is mainly linked to the characterization of the convective heat transfer between the solid surfaces and the cooling fluid, normally air. Different relations have been proposed in literature by several authors but the calculation of the heat transfer coefficients (HTC) is still mainly related to empirical correlation factors, based...
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,...
Recently, innovations such as advanced dielectric liquids and additive manufacturing have enabled electrostatic machines at the fractional horsepower scale that have competitive performance with their conventional electromagnetic counterparts. The emergence highlights a need for circuit modeling that guides machine design and drive controls, rooted in the canon of well-established electromagnetic...
This paper describes a simple design of a Fuzzy Logic Controller (FLC) that is suitable for real-time applications and uses novel output membership functions, which do not include overlap. This increases controller rate speed convergence, allows for a significant reduction in computational burden, and lowers the execution time. A digital signal processor board is used to implement the FLC based Field...
This paper proposes a new intelligent control for an indirect vector controlled induction motor drive for high performance, based on a finite element controller map. The traditional basic conventional algorithm (PI controller) has been successfully used to obtain decoupling control between the rotor flux and the torque. The basic PI has fixed gains that cannot be increased beyond certain limits. In...
Unmanned Aerial Vehicles (UAV) have found many applications in the areas such as remote sensing, surveillance, filming, and other scientific research. Due to the fact that multirotor UAVs are unstable systems in nature, feedback control is paramount in ensuring successful flight missions. Hexacopter is a type of UAV that is capable of carrying heavier payload with increased stability while being less...
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