Radiation Disturbance of Variable Frequency Winch Drive System in Underground Coal Mines

2013 ◽  
Vol 441 ◽  
pp. 552-556
Author(s):  
Hui Chen ◽  
Wen Bing Tang ◽  
Zhen Guan Cao ◽  
Hua Ping Zhou
Keyword(s):  
Field Strength ◽  
Electromagnetic Radiation ◽  
Frequency Converter ◽  
Coal Mines ◽  
Drive System ◽  
Radiation Environment ◽  
Regulation System ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Underground Coal Mines

In order to study the effect of variable frequency drive system upon electromagnetic radiation environment in underground coal mines, the mechanism of electromagnetic radiation from the variable frequency speed regulation system has been analyzed deeply, and the radiated electromagnetic noise from the variable frequency winch system with rated voltage of 1140V in underground coal mines has been measured. The measuring results show that the radiated emission from variable frequency drive system has certain effects on electromagnetic radiation environment in underground coal mines. The maximum radiated E-field strength reaches 123dBμV/m within the range of 9kHz to 20MHz nearby the frequency converter, and radiated E-field strength is no more than 33dBuV/m above 20MHz. Nearby the winch motor, the radiated E-field strength is weak, but the frequency spectrum of radiated E-field noises is more wide, which mainly distributes from 20MHz to 1GHz, but the maximum radiated E-field strength is less than 37dBμV/m above 20MHz.

Radiation Disturbance from AC Motors in Underground Coal Mines

2014 ◽  
Vol 490-491 ◽  
pp. 1105-1109
Author(s):  
Ji Ping Sun ◽  
Hui Chen ◽  
Zi Jian Tian
Keyword(s):  
Field Strength ◽  
Coal Mines ◽  
Underground Mines ◽  
National Standard ◽  
Ac Motors ◽  
Radiated Emissions ◽  
Underground Coal Mines ◽  
Electromotor System ◽  
Emission Limits ◽  
Electromagnetic Disturbances

The radiated electromagnetic disturbances produced by operating electromotor equipments in coal mines have some effects on the electromagnetic environment in coal mines. Based on the analysis of the Chinese national EMC standard on rotating electrical machines and the operation characteristics of the electromotor equipments in coal mines, it can be concluded that frequency spectrum of the radiated disturbances resulting from AC motors ranges from 9kHz to 1GHz. The radiated electromagnetic disturbances in the pumping house underground mines have been measured. The results show that the radiated emissions above 30MHz produced by the normal running electromotor system are quite low, which are comparable to the radiated emission limits set in the Chinese national standard GB 755-2008;the maximum radiated field strength reaches about 0.56V/m under 30MHz. However, when motors start or stop, the radiated field strength can reach about 1.26V/m or higher. Therefore, some shielding measures for monitoring and communication equipments should be taken to reduce the radiation interference from AC motors.

scholarly journals EXPERIMENTAL INVESTIGATION OF A SIX-PHASE VARIABLE FREQUENCY DRIVE / ŠEŠIŲ FAZIŲ DAŽNINĖS PAVAROS EKSPERIMENTINIS TYRIMAS

2016 ◽  
Vol 8 (3) ◽  
pp. 339-344 ◽  
Author(s):  
Tadas Lipinskis ◽  
Vytautas Bleizgys
Keyword(s):  
Frequency Converter ◽  
Voltage Source ◽  
Maximum Efficiency ◽  
Variable Frequency ◽  
Phase Variable ◽  
Phase Voltage ◽  
Variable Frequency Drive ◽  
Matlab Simulink ◽  
Ac Motor ◽  
Data Acquisition Card

Experimental results of a variable frequency drive, consisting of a six-phase voltage source inverter and six-phase asynchronous AC motor are presented in this paper. Frequency converter uses a six-phase space vector PWM scheme created by the author. The voltage forming scheme is implemented in Matlab/Simulink, and logical signals for inverter control are transferred from PC via the National instruments PCI-6024E data acquisition card. Voltages, at which the experimental motor operates at maximum efficiency, were determined experimentally. Motor transitions, when it is operating with one, two, and three failed phase windings are presented, confirming that a six-phase motor can operate with up to three failed windings. Darbe pateikiami dažninės pavaros, sudarytos iš šešių fazių dažnio keitiklio ir šešių fazių asinchroninio elektros variklio, eksperimentinių tyrimų rezultatai. Šešių fazių įtampai formuoti taikomas autoriaus sukurtas erdvinių vektorių moduliacijos algoritmas, naudojantis vidutinio ilgio vektorius. Algoritmas realizuotas asmeniniu kompiuteriu Matlab/Simulink terpėje. Signalams inverterio raktų valdymui iš kompiuterio gauti panaudotas National Instruments PCI-6024E duomenų įvesties/ išvesties įrenginys. Atlikti inverterio įtampos, kuriai esant šešių fazių variklis dirba maksimaliu naudingumo koeficientu, tyrimai. Pateikiami šešių fazių variklio greičio ir sukimo momento pereinamųjų procesų tyrimo rezultatai, esant vienos, dviejų ir trijų variklio apvijų gedimams, patvirtinantys, kad šešių fazių variklis gali ribotai veikti sugedus iki trijų apvijų.

Design ADRC for Cutter Suction Dredger Cutter Motor Variable Frequency Drive System

2014 ◽  
Vol 1008-1009 ◽  
pp. 650-653 ◽  
Author(s):  
Ming Bai ◽  
Jin Hua Chen ◽  
Cheng Ning Xie ◽  
Fang Hui Li
Keyword(s):  
Virtual Instrument ◽  
Design Method ◽  
Harmonic Distortion ◽  
Speed Control ◽  
Mathematic Model ◽  
Drive System ◽  
Variable Frequency ◽  
Fundamental Wave ◽  
Variable Frequency Drive ◽  
Labview Platform

In order to achieve precise speed control for cutter suction dredger cutter motor, the controller should adapt well to uncertainties, such as geological environment, water flow, mechanical disturbance, etc. It makes the design of cutter motor controller always a hard work. This paper proposes an active disturbance rejection controller (ADRC) approach for cutter suction dredger cutter motor variable frequency drive system. Firstly, the LabVIEW platform was established by virtual instrument technology, which collected operating data of cutter motor in fundamental wave and total harmonic distortion (THD). Then cutter motor motion mathematic model was built and the ADRC design method was introduced. Lastly, the simulation results in the cutter velocity control and disturbance environments were done. The results show that the ADRC controller has strong robustness, and the precise speed control can be implemented.

scholarly journals MATLAB /Simulink Modelings and Experimental Design of Variable Frequency Drive for Speed Control of Three-Phase Induction Motor

2019 ◽  
Vol 8 (2) ◽  
pp. 3046-3052
Keyword(s):  
Induction Motor ◽  
Continuous Process ◽  
Speed Control ◽  
Drive System ◽  
Variable Frequency ◽  
Inrush Current ◽  
Variable Frequency Drive ◽  
Matlab Simulink ◽  
Three Phase ◽  
Wide Range

This paper presents the PWM (Pulse Width Modulation) based speed control of three-phase asynchronous (Induction) motor. Induction motor is the leading machine used in many industrial controls, automation processes and in the field of HVAC applications. However, induction motor has fixed rated speed when directly connected to ac supply. It is necessary to design a drive system to obtain variable speed at its output to fulfill the application requirement. For this reason, we have designed a “VFD (Variable Frequency Drive)”, which gives desired speed- according to load changes unlike the DC motors, which do not require any speed controlling drive. Currently with the technological elevation in drive systems, the speed control of induction motor is more economical, convenient, reliable, and accurate. It provides continuous process control over a wide range of speed. VFD not only controls the speed of induction motor but also make its starting smooth by reducing starting inrush current and improves power factor. In result, power consumption is also reduced. In this paper, we have designed and analyzed the MATLAB/Simulink model of open loop drive system and then implemented an experimental hardware design.

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