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In this paper, a semi-analytical modeling method is applied to a Doubly Salient Permanent Magnets machine. This machine is characterized by a rotor carrying a large number of teeth. It is suitable to applications requiring high torque and low speed. A Reluctance Network is used in order to model the machine with a good compromise between accuracy and simulation duration. Moreover, the antisymmetric...
This paper proposes to optimize wind energy extraction through a hybrid PID-Fuzzy pitch control strategy for wind turbines. The modeling of a 20 kW wind turbine will be reviewed, in which three strategies of pitch control, PID, Fuzzy and Hybrid PID-Fuzzy, will be implemented, comparing the results of the different control strategies.
This article shows development of a fixed wing Unmanned Aerial Vechicle (UAV) prototype with multi rotor control system. This model pretends increase flight time of multi rotor system using aerodynamic characteristics. The lift force generated by a wing reduce the required power of the motors to raise up the structure during horizontal forward flight. For airfoil selection and sizing of the wing,...
The in-wheel motor electric vehicle (IWM-EV) is an overwhelming tendency in modern automobile due to its unmatched advantages. However, the new structure of IWM-EV which packets driving motor in wheel will induce the new problems, e.g. motor unbalanced radial force and airgap deformation of driving motor, etc. For the IWM-EV performance, these new problem is one of the major concerns. Taken switched...
Typically, crop-sprayers are designed to be used at the farmland located far from residence. However, farmlands may be found often in the middle of residence. Crop-sprayer for such dotted farmland should be designed specifically not to distribute chemicals outside of the farmland. The purpose of this research is to figure out the optimum configuration for spraying chemicals for dotted farmland.
In order to increase the output power density and maintainability of the conventional driving system in electric vehicle, the research on magnetic gears is being carried out variously all over the world. In this paper, the design technique of the magnetic-geared permanent magnet synchronous motor(MG-PMSM) is first studied for the application of the MG-PMSM structurally integrated with magnetic gear...
This paper presents the design of an Interior permanent magnet (IPM) synchronous machine to improve machine performance by increasing saliency ratio and minimizing the leakage flux through the ribs and air barriers of an IPM machine. A bar-type IPM basic model is taken and two variables, variable 1 as factor-A and variable 2 as factor-B are analyzed. Factor-A is the radial distance of the rotor air...
In this paper, a new single-phase flux switching axial flux permanent magnet motor (FS AFPM) is presented. It has a double stator and single rotor (DSSR) disc-type structure. The rotor disc is a simple salient pole rotor, and it is sandwiched between the two stator discs. The permanent magnets (PMs) are embedded in the stator discs, which also contain the single-phase windings. To enhance the self-starting...
The single-phase line-start synchronous reluctance motor (LSSynRM) is suitable for household appliances, but an optimized design of rotor, crucially influences the performance of motor, is hard to obtain. This paper optimizes the rotor design of LSSynRM to make a higher saliency ratio with the trade-off between saliency ratio and synchronizing ability. The mechanical-field-circuit coupled Finite element...
Ia this paper, a Halbach arc linear permanent magnet machine (ALPMM) for large telescope application is analyzed by finite element method. The ALPMM consists of one rotor and three segmental stators in which the stator core and windings are characterized by “C” shape. A 3-D air-gap, which can significantly increase the torque density, is formed between the C-shape stator and the rotor. The key electromagnetic...
This paper proposes a finite-time control law for quadrotor aircraft to achieve position tracking control in a finite time. Firstly, the position dynamical equation and the attitude dynamical equation are introduced respectively. Secondly, based on the technique of finite-time control, a finite-time position controller is designed to ensure the desired trajectory can be tracked by the real position...
The present work numerically explores the performance characteristics of Darrieus turbine with NTU-20-V and NACA 0018 airfoils. The NTU-20-V airfoil was carved out to enhance the fatigue life of the aluminium extruded blades by reinforcing with glass fiber material in standard shapes. The earlier studies by the authors include conceiving the airfoil profile through genetic algorithm optimization followed...
A novel tilt tri-rotor unmanned aerial vehicle (UAV) which combines the vertical flight capability of a helicopter and forward flight performance of an airplane is proposed. The two front rotors are able to tilt from the vertical to the horizontal position, however, the third rotor is fixed in the aft fuselage with a small angle. The nonlinear dynamic model of tilt tri-rotor UAV is given by the equations...
This paper presents the comparison of power captured by vertical and horizontal axis wind turbine (VAWT and HAWT). According to Betz, the limit of maximum coefficient power (CP) is 0.59. In this case CP is important parameter that determines the power extracted by a wind turbine we made. This paper investigates the impact of wind speed variation of wind turbine to extract the power. For VAWT we used...
Cogging torque and permanent magnet electric machines are difficult to separate. This torque always remains overdue to the interaction between the magnetic field caused by the permanent magnet against the stator slot. The method proposed for reducing cogging torque in this study is the Half cylinder anti-notch design and sequence with the cutting-edge design. It further considers the implement of...
This paper presents a new structure of multicopter with its propellers installed in three different directions. The aim is to achieve complete independent control of position and attitude of the multicopter. This can allow us to control the position with its desired attitude controlled simultaneously. As such, this new multicopter can hover at any fixed point with its attitude changed freely. This...
In this paper, a complete numerical simulation model of helicopter flight dynamics was established. The modeling of the main aerodynamic components of the helicopter and the aerodynamic interference are taken into account, and the modeling methods of the airfoil aerodynamic model, the induced velocity model and the waving movement model are discussed in detail. Based on the hierarchical and modular...
Many hybrid UAVs capable of vertical takeoff and landing (VTOL) and fixed-wing flight are being introduced for their maneuverability, efficiency and high cruise speed. The benefits of these systems can be exploited effectively using task planning frameworks tailored to their unique properties. To address this need, we present a motion planning strategy for these hybrid UAVs in cluttered urban settings...
This paper designs a robust cascade PID attitude controller for the quadrotor helicopter. Firstly, based on the near-hover dynamic model of quadrotor helicopters, dual loop cascade PID attitude controllers are designed with angular rate feedback as the inner loop and attitude angle feedback as the outer loop. Then robust compensators are added to reject the effect of external wind disturbance and...
Tilt rotor unmanned aerial vehicle (TRUAV) with ability of hovering and high-speed cruise has attached much attention, but its transition control is still a difficult point because of varying dynamics. This paper proposes a multi-model adaptive control (MMAC) method for a quad-TRUAV, and the stability in the transition procedure could be ensured by considering corresponding dynamics. For safe transition,...
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