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In condition of there is not rotor position detection method for full speed in the study of PMSM sensorless control, this paper tries a kind of compound algorithm by dividing the high speed and low speed into different section, to inject high frequency in low speed, detect the current signal and get the rotor position. The sliding mode observer designed in high speed to detect BEMF and get the rotor...
The technique of curvilinear boundary-fitted coordinate system is used for the mathematical model of pressure underground seepage flow and the boundary conditions and the method of solving the transformed equations have been presented. The computing example shows that the computed hydraulic parameters conform to the physical laws. Compared with the finite element method, the presented method need...
The stator flux observer is a key part in the method of Direct Torque Control (DTC). However, the accuracy of the stator flux estimation directly affected the performance of DTC. The traditional induction motor stator flux observation method have been analyzed in This paper. And for the Shortcomings of existing methods, a on-line identification methods based on Radial Basis Function(RBF) have been...
Direct Torque Control (DTC) is a high performance control method. The stator flux observer is a key part in the method. The accuracy of the stator flux estimation directly affected the performance of DTC. The traditional induction motor stator flux observation method have been analyzed in This paper. And for the shortcomings of existing methods, a on-line identification methods based on Radial Basis...
The aim of the paper is to establish a new model of equivalent strategy for fuzzy bi-matrix games. Precisely, we introduced the possibility measures and presented the possibility space based on the axiom of the possibility measures. The expected value of the fuzzy variables was given in possibility space. Then, we established an expected model of fuzzy bi-matrix games and defined the expected value...
The paper breaks the routine and makes a new exploration in office rental pricing. Merging the Hedonic model and the characteristics pricing, building effective multi-linear function of the form of office Hedonic models, abstracting the most important impact factor through the model, and estimating rental prices of offices. And then based on the most significant factor in choice of examples to use...
This paper is concerned with a mathematical model for numerical simulation of 2D flood waves due to complete or partial dam-break. The governing water equations are solved by the MacCormack's predictor-corrector technique. The mathematical model is used to numerically predict 2D flood waves due to partial instantaneous dam-break in a rectangular open channel with a rectangular cylinder barrier downstream,...
A three-dimensional finite difference transport model appropriate for the coastal environment is developed for the solution of the three-dimensional convection-diffusion equation. A higher order upwind scheme is used for the convective terms of the convection-diffusion equation, to minimize the numerical diffusion. The validity of the numerical model is verified through a test problem, whose exact...
The performance of the vector control depends on the precise measurements of parameters in motor. The rotor resistance is one of the most important parameters. An adaptive scheme for on-line identification of the rotor resistance based on the artificial neural networks is proposed in this paper. By using the BP algorithm theory, the rotor flux error between the voltage model and the neural network...
The direct torque control (DTC) technique has been widely used as a control strategy for motor drive system. High torque ripple is a major problem when the motor is running at low speed in DTC system. By analyzing the causes of torque ripple, it is can be found that the change of the speed error signal is a good indicator to determine the situation of motor torque ripple. In this paper, a DTC strategy...
The direct torque control (DTC) technique has been widely used as a control strategy for motor drive system. High torque ripple is a major problem when the motor is running at low speed in DTC system. By analyzing the causes of torque ripple, it is can be found that the change of the speed error signal is a good indicator to determine the situation of motor torque ripple. In this paper, a DTC strategy...
The performance of the vector control depends on the precise measurements of parameters in motor. The rotor resistance is one of the most important parameters. And its variation is very significant because of the temperature rise and skin effect during the implementation of control. A rotor resistance estimation method based on artificial neural network (ANN) is proposed in this paper combining with...
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