The Construction of Mathematical Model for Electromagnetic Torque Online Measuring System with Three-Phase Induction Motor

2011 ◽  
Vol 71-78 ◽  
pp. 4252-4255
Author(s):  
Qing Bo Meng ◽  
Gui Xiang Zhang
Keyword(s):  
Mathematical Model ◽  
Induction Motor ◽  
Coordinate Transformation ◽  
Measuring System ◽  
Electromagnetic Torque ◽  
Motor Torque ◽  
Three Phase ◽  
Practical Engineering ◽  
The Mathematical Model

Based on the coordinate transformation, the paper analyzes and constructs the mathematical model for electromagnetic torque online measuring system with three-phase induction motor. Additionally, the author proposes the improved scheme for model limitations. The system can meet the random and fast requirements on the occurrence and measurement of the three-phase induction motor torque and has high practical engineering value.

scholarly journals A New Soft Starting Method for Wound-Rotor Induction Motor

2011 ◽  
Vol 62 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Mohammad Sharifian ◽  
Mohammad Feyzi ◽  
Mehran Sabahi ◽  
Meysam Farrokhifar
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Computer Program ◽  
Equivalent Circuit ◽  
Induction Motor ◽  
Optimization Method ◽  
Starting Time ◽  
Three Phase ◽  
The Mathematical Model ◽  
Starting Torque

A New Soft Starting Method for Wound-Rotor Induction Motor Starting of a three-phase Induction motor using a starter rheostat in rotor circuit has some disadvantages. A new method for starting of a three-phase motor by using a parallel combination of resistors, self-inductors and capacitors in rotor circuit is proposed in this paper. The proposed method ensures the soft and higher starting torque as well as limited starting current as compared to shorted rotor method. The characteristic curves for both methods (shorted rotor and rotor with added elements) are provided. The mathematical model based on the steady-state equivalent circuit of the induction motor is expanded in frequency domain and the required computer program is prepared using an optimization method. The values for added elements to rotor circuit are calculated in such a way that minimum starting time considering current and torque limitations are achieved.

scholarly journals Electromagnetic Torque Estimation of a Three-Phase Induction Motor for Setting the Feedrate of a Milling Machine

2014 ◽  
Vol 4 (6) ◽  
Author(s):  
Élida Fernanda Xavier Júlio ◽  
Simplício Arnaud da Silva ◽  
Cícero da Rocha Souto ◽  
Isaac Soares de Freitas
Keyword(s):  
Induction Motor ◽  
Milling Machine ◽  
Electromagnetic Torque ◽  
Torque Estimation ◽  
Three Phase

Mathematical model for simulation of field oriented control using dynamic three-phase induction motor

2016 ◽  
Author(s):  
Boonruang Wangsilabatra ◽  
Satean Tunyasrirut ◽  
Wachirapond Permpoonsinsup
Keyword(s):  
Mathematical Model ◽  
Induction Motor ◽  
Field Oriented Control ◽  
Three Phase

Study of Large Scale Measurement Method Based on Leapfrog Principle

2011 ◽  
Vol 130-134 ◽  
pp. 1560-1563
Author(s):  
Long Jiang Zheng ◽  
Xue Li ◽  
Ling Ling Qin ◽  
Hong Bin Chen ◽  
Xue Gao ◽  
...  
Keyword(s):  
Coordinate Transformation ◽  
Large Scale ◽  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Measuring System ◽  
Wide Range ◽  
General Coordinate Transformation ◽  
Measuring Machine ◽  
The Mathematical Model

At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.

Transfer Heat Mechanism of Oil-Gas-Water Three-Phase Flow in Pipeline

2011 ◽  
Vol 199-200 ◽  
pp. 1609-1612
Author(s):  
Qian Jun Mao
Keyword(s):  
Mathematical Model ◽  
Soil Temperature ◽  
Phase Flow ◽  
Fundamental Theory ◽  
Three Phase ◽  
Three Phase Flow ◽  
The Mathematical Model ◽  
Oil Gas ◽  
Flow Transfer ◽  
Heat Mechanism

It is well known that the oil-gas-water three-phase flow belongs to the field of multiphase flow,transfer heat mechanism of which is very complicated.Transfer heat mechanism is affected not only by different buries in oil gathering pipeline, but also by soil temperature periodicity change. Both domestic and oversea scholars have already studied on the transfer heat mechanisms of oil-gas-water three phase,but they are still in the level of fundamental theory and laboratory.This paper establishes transfer heat models of the oil-gas-water three-phase flow in buried oil gathering pipeline, including the physical model and the mathematical model,and testing in experiment .The purpose of this paper is to analyze value between the calculation and the testing . The results show that the mathematical model of this paper is accurate , and the relative error is ≤ 10%.

Mathematical Model of Three-Phase Boost Converter

2012 ◽  
Vol 507 ◽  
pp. 96-100
Author(s):  
Zhong Zhang ◽  
Wei Ming Tong
Keyword(s):  
Mathematical Model ◽  
Nonlinear Control ◽  
Control Strategy ◽  
Boost Converter ◽  
Analysis Method ◽  
Topology Structure ◽  
Conservation Of Energy ◽  
Three Phase ◽  
Converter Topology ◽  
The Mathematical Model

Now the nonlinear control strategy used by a lot of power electronic converters is not dependent on the mathematical model of the system. They are only based on the error of control variables to control the output voltage or other variables, and this leads to the shortcomings of poor control and not easy to optimize. The fundamental reason is that they are not based on the mathematical model of converter topology structure. This paper presents a new way to build mathematical model. The paper established the unified mathematical model of the three-phase Boost converter topology structure by studied the three-phase Boost converter topology structure deeply and based on the law of conservation of energy and combined with small-signal modeling analysis method, and done the systematic analysis for it. The analysis method is also applicable to other converter topology, such as the buck, buck-boost, etc., and the model not only can be used in the controller design, can also provide a theoretical basis for the applications of a new nonlinear control strategy.

Numerical Simulation and Calculation of Freezing Time of Soil

2012 ◽  
Vol 246-247 ◽  
pp. 327-330
Author(s):  
Yan Hui Jiao ◽  
Zhong Gui Ren
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mathematical Model ◽  
Freezing Process ◽  
Freezing Time ◽  
Practical Engineering ◽  
Explicit Finite Difference ◽  
The Mathematical Model ◽  
Perform Computer Simulation ◽  
Explicit Finite Difference Method

The mathematical model based on temperature formulation for describing freezing course of soil is presented and the explicit finite difference method is used to perform computer simulation of freezing time of soil in this paper. It seems to be satisfactory by comparing the numerical results by the method of TDMA with experimental data. It is significant for freezing process and freezing units, optimum design of practical engineering.

scholarly journals MATHEMATICAL MODELING OF A THREE-PHASE TRANSFORMER TAKING INTO ACCOUNT A MAGNETIC CORE ASYMMETRY

2021 ◽  
Vol 295 (2) ◽  
pp. 165-171
Author(s):  
O. KIMSTACH ◽  
◽  
I. ILLIASHENKO ◽  
A. ZHEZHELO ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Magnetic System ◽  
Short Circuit ◽  
Magnetic Core ◽  
Transient Processes ◽  
Three Phase ◽  
Significant Difference ◽  
The Asymmetry ◽  
High Level ◽  
The Mathematical Model

The paper analyses the aspects of modelling the operation of a three-phase core-type transformer. The features of the magnetic system construction of the transformer, which generate asymmetry, are disclosed. The fundamentals and methods for modelling a transformer in dynamic modes are considered. The main purpose of the paper is to research the influence of taking into account the asymmetry of the transformer magnetic core on its dynamic model. The paper proposes the mathematical model of a three-phase planar core-type transformer, which takes into account the asymmetry of the magnetic core. The mathematical model is based on the model of a generalized electric machine in the ABC axes, which is widely recognized and characterized by a high level of adequacy. A refined model, which takes into account the power losses in the magnetic core, has used. As is well known, such a model is characterized by higher accuracy and adequacy in the calculation of transient processes. For the proposed mathematical model, a comparative analysis of the calculated curves of transient processes for a 63 kVA transformer with a voltage of 6 / 0.4 kV is made. To disclose the effect of taking into account the magnetic core asymmetry of the transformer in the mathematical model, the current differences were calculated in pu for the modes of switching on at full power and three-phase short circuit. These modes are the most common and indicative in the analysis of the operability and stability of transformers. It was found that the most significant difference, which is obtained by taking into account the magnetic system asymmetry of the transformer, is 5…6% when it is switched on at full load. Thus, the relatively simple transformations and updating of the mathematical model of the transformer allow significantly increase its adequacy. The proposed mathematical model can be more effectively used when the non-typical design of three-phase transformers or reactors with significant asymmetry of the magnetic core is considered.

scholarly journals Mathematical Model Implementation of SPWM fed Three-phase Induction Motor Drive Using MATLAB Simulink

2020 ◽  
Vol 25 ◽  
pp. 328-332
Author(s):  
Amir Rasyadan ◽  
Sazali bin Yaacob ◽  
Pranesh Krishnan ◽  
Mohamed Rizon ◽  
Ang Chun Kit ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Induction Motor ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Matlab Simulink ◽  
Three Phase
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