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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...
This paper proposes an alternative spoke type interior permanent magnet machine (STIPMM) design to minimize the pulsating torque and decrease the use of permanent magnet materials. The proposed rotor design consists of a number of rotor lamination stacks with notches made on the surface and packed in the axial direction. Within each stack, the width of the permanent magnets (PMs) and the span of the...
This paper presents a pump motor modeling and optimization method based on electromagnetic calculation and BP neural network. This method, according to the structure parameters of three-phase asynchronous motor in drainage pump, through the motor electromagnetic calculation, calculates the motor performance. It establishes a BP neural network model to fitting flow and water head for hydraulic performance...
Rotor balancing for electric motors is nowadays crucial, because it ensures low mechanical excited vibrations and a high product quality. In this paper, a simulative investigation of different algorithms for the selective assembly of rotors, to reduce the mechanical unbalance, is presented. In order to do so, existing manufacturing deviations in the magnets are used as balance weights. The investigated...
Classical objective of wind turbine control is to maximize the power extracted from wind. However, with the increase in wind turbine size the structural loads become a limiting factor for safe wind turbine operation and wind turbine operating life. In this paper we investigate the design of a model predictive controller that reduces wind turbine loads at the expense of wind turbine power variability...
This paper presents the application of the particle swarm algorithm for optimization of the stator slot-geometry of a high-speed permanent magnet synchronous machine.
Simulating the rotational vibrations generated in internal combustion engines with electrical drives offers new possibilities in testing drive train components. The wide frequency range and large amplitudes in angular acceleration, however, are non-typical performance specifications for electric drives and require specific rotor designs. Still, the high performance criteria lead to a highly thermal...
Effects of system unbalance and system harmonics on the operation of DFIG are of great concern. This is primarily due to the fact that system unbalance and harmonics can generate unwanted torque undulations that can potentially undermine the mechanical integrity of the tower and reduce the life time of the moving components that are attached to the generator shaft. The present paper focuses on development...
In this paper a multi-objective criterion function is introduced to maximize annual energy input (AEI) and minimize permanent magnet (PM) volumes in a permanent magnet synchronous generator (PMSG). First, a PMSG is designed and modeled analytically to achieve above mentioned targets. After that, effects of various generator parameters on the two above-mentioned objective functions are analyzed using...
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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