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For a four-rotor mini helicopter, an adaptive controller is presented based on Immersion and Invariance (I&I) approach. Although there are many aerodynamic coefficients such as thrust coefficients and drag coefficients with uncertainty in the model, a new parameterization with a fewer uncertain coefficients is developed to simplify the complex multivariable parameter adaptation. It is shown that...
Renewable energy technologies have recently attracted great attentions. Several renewable energies such as wind, solar, etc. are now being investigated to solve the current energy crisis. In this paper, a novel control strategy for variable speed wind turbine to extract the maximum power from wind is proposed without knowing any of the system parameters and the aerodynamics. Lyapunov stability analysis...
For the comfort and security of users, noise of electric motors is a critical issue. The harmonic content of the magnetic pressure inside the air gap being the source of the sound radiated by the stator, it suits to know the impact of field weakening. We will show that for some load angles the pressure harmonics change so that the field weakening could be heard.
This paper considers the inductance spatial distribution of Interior Permanent Magnetic Synchronous Motors (IPMSM) in various load conditions. The IPMSM machine possess a unique relationship between phase inductance and rotor position, that make it possible to implement sensorless control by extracting rotor position information from the inductance distribution. During the past two decades, many sensorless...
This paper presents a comparative study of two sensorless Permanent Magnet Synchronous Motor drive control algorithms using an optimal two stage extended Kalman filter. Beside the estimation of position and rotor velocity with and without the estimation of load torque is considered. An algorithm proposed by C.S. Hsieh and F.C. Chen in 1999 for linear parameter estimation is extended to the non-linear...
This paper presents an analysis of the torque ripple of a six-phase fault tolerant permanent magnet synchronous machine (PMSM6) for electrical power steering system (EPS) applications. Opened stator phase is the realistic fault condition that can be imagined for a machine fed by a power converter drive system. The behavior of the machine was analyzed under three different winding fault conditions...
In this paper, high-order fault-related current harmonics are used for the diagnosis and discrimination between two different faults in induction machines: rotor asymmetries and mixed eccentricities, both when only these faults are simultaneously present in the machine and when they are combined with other non-fault related phenomena. The idea is to track the evolutions of both the high-order fault-related...
This paper deal about high-speed electrical spindles motor design problems. Electrical as well as mechanical critical aspects are taken into account, highlighting the main drawbacks and physical limits that the designer has to consider. The correlation between the volume minimization and the speed increase is discussed on the basis of the torque density trend of some commercial high-frequency roto-statoric...
For various drilling applications where the space in the tool head is limited, two motor topologies with the stator outsourced from the head are proposed, allowing for compact design and direct drive. In order to meet the high torque requirements at low speed and operate at high speed up to 200 000 rpm a finite element analysis (FEA) is carried out and the machine design is optimized for maximum torque...
The paper describes a Direct-Flux Vector Control (DFVC) scheme suitable for synchronous Permanent Magnet (PM) drives employed in applications that require motor flux-weakening operation, as happens for traction drives. The proposed controller operates in stator flux reference frame and can be easily adapted for Surface-mounted PM (SPM) and Interior PM (IPM) motors. The stator flux is directly controlled...
This paper presents an outer-rotor type permanent magnet reluctance generator (PMRG) for a small-scale wind-turbine and micro-hydroelectric power generation. First, this paper describes a PMRG using ferrite magnets. Residual magnetic flux density of the ferrite magnet is about three times lower than the rare-earth magnet, but the cost is about 10 times lower. It is demonstrated that the proposed PMRG...
In this paper a new method for magnetic circuit design using the knowledge of corresponding harmonics in the magnetic field and the cogging torque is presented. At the beginning, different approaches to reduce cogging torque for machines with embedded permanent magnets which were presented in the last years are investigated and compared qualitatively. Afterwards, the new developed method is introduced...
In this paper the sensorless induction motor drive with MRAS-type speed and rotor-flux estimator is described and tested in a wide range of the rotor speed and flux. The dynamical and steady-state properties of the drive system dedicated to traction applications are tested in the low speed as well as under field weakening region. The sensorless induction motor drive is also tested from the point of...
Multiphase electric drives have been recently proposed for applications where the highest overall system reliability, combined with a reduction in the total power per phase, are required. Strategies like Field Oriented Control (FOC) and Direct Torque Control (DTC) have been traditionally used in these high performance applications. In this paper, a Predictive Torque Control (PTC) method is introduced...
Low frequency load torque oscillations and rotor faults have similar effects on stator current spectral contents of induction machines. Intensive researches efforts have been spent with the aim of separating them through Motor Current Signature Analysis (MCSA). So far, however, the proposed techniques are impractical because they need an accurate estimation of the machine parameters. In this paper...
This work deals with electric parameters identification of the induction motor at standstill using Adaline (ADAptive LInear NEuron) which is a type of ANN (artificial neural network). We will show that, at standstill, the motor can be expressed by a second order differential equation linking the current to the voltage. This second order transfer function can be approximated by two first order differential...
A novel simplified stator flux oriented control (SFOC) for three-level inverter-fed induction motor drive is proposed to achieve high performance torque control in both steady state and transient conditions. Sliding mode control (SMC) is designed, in stead of conventional PI controller, to obtain the continuous commanding voltage vectors. The speed accuracy and dynamic tracking performance, as well...
This paper investigates the generation capabilities of a switched reluctance machine for possible wind power generation applications. The long-term goal is to conduct Power Hardware-in-the-loop (PHIL) simulation using a dSpace-controlled 1kW switched reluctance generator (SRG) available in the lab. In the proposed PHIL simulations, the SRG is controlled to output a constant DC output voltage, which...
This paper describes two alternative designs of a direct-drive permanent-magnet generator for use in a novel sea-wave electrical generator. The basic system is briefly described and the target specification is given from the wave device. The design for a fractional-slot high-pole number brushless permanent-magnet generator and a torus generator are sized and developed using the design packages SPEED...
Wind Turbine (WT) systems based on Permanent Magnet Synchronous Generators (PMSG) have become important mainly due to their high power factor and high efficiency. In order to reduce costs, maintenance and complexity, speed and position estimators can be used to replace the corresponding sensors in low and high power WT. This paper studies a PMSG flux observer, which is used along with a PLL to estimate...
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