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As a kind of green energy, the wave energy exhibits high energy density, abundant global reserves, extensive application and high predictability. To this application, the direct driven linear motors already become strong candidates in recent year due to the motion feature of waves, therefore a kind PM-assisted reluctance synchronous linear generator (PMRSLG) is proposed in this paper. Based on FEA,...
Active Magnetic Bearings (AMBs) are now widely used for high rotational speed applications; where friction and maintenance cost are to be minimized; such as turbo-machinery and high speed compressors. Conventional PID controllers are commonly employed in these systems. The high speed variations cause gyroscopic effects which degrade the system performance. Moreover, under high speeds, AMB systems...
The main purposes of this paper consist of two parts: Firstly, the geometric topology and operation principle of a novel outer-rotor-permanent-magnet flux-switching (ORPM-FS) machine is proposed and simply introduced. Secondly, based on 2D finite element method, phase back electromotive force (back-EMF) waveform of the ORPM-FS machines with different combinations of stator slots and rotor poles is...
The rotor-bearing system of a stored energy motor, which is composed of exciter, main generator and asynchronous motor, has typical characteristics of serious unbalanced mass distribution. According to the rotor and bearing system of the stored energy motor, dynamic performance optimization analyses are carried out by means of the finite element analysis method, to give the system optimization method...
Aerospace, automotive and other industrial drive systems require low cost, high torque/power density machines. The double stator switched reluctance machine (DSSRM) is a recently invented switched reluctance machine. It has very high torque density due to unique magnetic flux path design and machine structure. A 50 kW version of DSSRM has been designed and manufactured; this paper introduces the optimization...
In this work, the concept of total power optimization for wind farms under wake interaction is presented. A dedicated Computational Fluid Dynamic (CFD) model of the wind based on the numerical solution of the 2D Navier-Stokes equations is implemented in an efficient way by exploiting the sparsity of the involved matrices. Thus, the total power optimization over the farm is performed by incorporating...
High grade torque control in Switched Reluctance Motors (SRM) is a key element in successful integration of this family of adjustable speed motor drives in automotive applications. Mitigation of torque pulsation in SRM drives using optimization of phase currents which are obtained from Finite Element (FE) analysis has been attempted in the past. However, long computation time of FE analysis prohibits...
This paper presents a novel two level current optimization algorithm for the control of the spherical motor. The proposed spherical motor consists of a rotor with 8 cylindrical permanent magnet (PM) poles and a stator with 24 air-core coils. An analytical expression of the torque model is obtained based on finite-element method. Based on this expression, the relationship between the motor torque and...
We address the controller design and the trajectory generation for a quadrotor maneuvering in three dimensions in a tightly constrained setting typical of indoor environments. In such settings, it is necessary to allow for significant excursions of the attitude from the hover state and small angle approximations cannot be justified for the roll and pitch. We develop an algorithm that enables the real-time...
An operation mode called hybrid sliding pressure operation mode, which considered the valve point and operation load together, was proposed in this paper based on the analysis and study of a large number of unit operation optimization methods. In addition, according to the steam-excited vibration occurred during the optimization process when the nozzle governing steam turbine switch single valve to...
Due to high torque-to-loss ratio, permanent magnet synchronous machines (PMSM) have received increasing attention in automotive applications. In addition to high efficiency, quiet operation of the propulsion drives are desirable in automotive, naval and military applications. To effectively mitigate the effects of acoustics noise and vibration in PMSM, a numerically efficient method for optimization...
The paper presents an optimization design of an in-wheel BLDC motor for a kick scooter. The optimization is performed using a genetic optimization tool combined with a FEM commercial software. The new contributions of the paper are: (i) introduction of three operating modes for which the motor is optimized with a reduced number of FEM simulations and (ii) new approach to simultaneously maximize the...
In this paper, we will study the effect of losses (non including losses in the power electronic) of an optimized eight pole radial AMB on the discharge time of a no-load Long Term Flywheel Energy Storage (LTFES). Load capacity is the main parameter of an Active Magnetic Bearings (AMB) design. This parameter has to take into account the external disturbance force which may be constant, synchronous...
This paper presents the effect of losses on a radial active magnetic bearings (AMB), used in the long term flywheel energy storage (LTFES). The study does not take into account the losses due to power electronics and windage losses (due to the friction between external rotor surface and the air). Therefore, we restricted the loss computation to those of radial AMB only. To simplify this work, we focused...
In this paper, we focus on the analytical calculation of the tangential forces that generate the armature and the cogging torque in brushless DC machines. We extend previously presented methods using conformal mapping to (i) avoid the singularity of the magnetic flux density at the tooth tip during the transformation and thereby overcome the limitations of this approach with respect to the calculation...
Rotor is the major work components of vertical shaft impact crusher and tip set extra hard is the most wearing part of it. Based on the analysis of the structure and the working principles of the vertical shaft impact crusher, we set up the three-dimensional model of the rotor in Solid Works. Through the importation of the 3-D model into ADAMS for the dynamic simulation, we simulate the throwing process...
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