Research on Overloading Protection of Permanent Magnetic Coupler in Coal Mine

2014 ◽  
Vol 597 ◽  
pp. 492-497
Author(s):  
Wen Qi Yuan ◽  
Yue Liu ◽  
Dong Li ◽  
Guo Ying Meng
Keyword(s):  
Experimental Data ◽  
Mechanical Characteristic ◽  
Coal Mine ◽  
Mechanical Characteristics ◽  
Input Power ◽  
Maximum Torque ◽  
Characteristic Curves ◽  
Motor Torque ◽  
Output Torque

In this paper, with simulations and experiments analysed by the software of Ansoft Maxwell, research on overloading protection of permanent magnetic coupler in coal mine is carried out and the conclusive curves of mechanical characteristics are plotted through experimental data. The conclusion can be gained from mechanical characteristic curves: when the output value of torque reaches the maximum torque of magnetic coupler, the output torque and speed will drop along with increases of the slip, and the input power value of motor is less than the power value at the time when the motor torque value is at the maximum. It explains that the magnetic coupler has the function for overloading protection.

scholarly journals Methane Content Estimation in DuongHuy Coal Mine

2018 ◽  
Vol 35 ◽  
pp. 01005 ◽  
Author(s):  
Van Thinh Nguyen ◽  
Waldemar Mijał ◽  
Vu Chi Dang ◽  
Thi Tuyet Mai Nguyen
Keyword(s):  
Experimental Data ◽  
Coal Mining ◽  
Coal Mine ◽  
Coal Mines ◽  
Methane Content ◽  
Underground Coal Mining ◽  
Coal Seams ◽  
Underground Coal Mine ◽  
Different Depths ◽  
Quang Ninh

Methane hazard has always been considered for underground coal mining as it can lead to methane explosion. In Quang Ninh province, several coal mines such as Mạo Khe coal mine, Khe Cham coal mine, especially Duong Huy mine that have high methane content. Experimental data to examine contents of methane bearing coal seams at different depths are not similar in Duong coal mine. In order to ensure safety, this report has been undertaken to determine a pattern of changing methane contents of coal seams at different exploitation depths in Duong Huy underground coal mine.

Thermal Model of a Thinned-Die Cooling System

2003 ◽  
Author(s):  
N. Boiadjieva ◽  
P. Koev
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Cooling System ◽  
Input Power ◽  
The Other ◽  
System Parameters ◽  
Air Intake ◽  
Optical Probing ◽  
Cooling Air ◽  
Better Than

For through-silicon optical probing of microprocessors, the heat generated by devices with power over 100W must be dissipated [1]. To accommodate optical probing, a seemingly elaborate cooling system that controls the microprocessor temperature from 60 to 100° C for device power up to 150W was designed [2]. The system parameters to achieve the desired thermal debug environment were cooling air temperature and air flow. A mathematical model was developed to determine both device temperature and input power. The 3-D heat equation that governs the temperature distribution was simplified to a case of a 1-D rod with one end at the device center and the other at the cooling air intake. Thus the cooling system was reduced to an analytical expression. From experimental data, we computed all coefficients in the model, then ran extensive tests to verify—the accuracy was better than 10% over the entire temperature and power ranges.

scholarly journals Operation modes and control algorithms of anisotropic permanent magnet synchronous motor (IPMSM)

2019 ◽  
Vol 140 ◽  
pp. 10006
Author(s):  
Aleksandr Lutonin ◽  
Andrey Shklyarskiy ◽  
Yaroslav Shklyarskiy
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Speed Limit ◽  
Maximum Torque ◽  
Field Weakening ◽  
Output Torque ◽  
And Control

This paper represents control strategy of anisotropic permanent magnet synchronous motor (IPMSM) in the field-weakening region. Field weakening controller allows to increase maximum achievable speed with output torque reduction. Proposed control system consists of four general modes: MTPA (maximum torque per ampere), MC (maximum current), FW (field weakening), and MTPV (maximum torque per voltage) which must be chosen accordingly to motor speed, current and torque references. Operation point is found as an intersection of torque hyperbola and voltage ellipse curves in d-q motor’s current reference frame involving motor parameters’ limits. However, due to nonlinear dependence between torque and voltage equations, it is quite complicated to obtain both right control mode selection and reference output calculation. In order to solve this problem, a unified control algorithm adopted for wide speed and torque reference with online constraints calculation is proposed. Matlab/Simulink control model of PMSM motor and control system were designed in order to show developed strategy performance. Simulation results shows increasing of speed limit by more than 2.5 times related to nominal speed with high controller’s response. However, speed limit increasing leads to a decrease in motor’s output torque. Due to this fact, presented control strategy is not suitable for applications where nominal torque level is essential for all speed operation points.

scholarly journals In-beam tests of a PET demonstrator (LAPD) for hadrontherapy beam ballistic control: data comparison to Geant4 Monte-Carlo predictions

2020 ◽  
Vol 225 ◽  
pp. 09005
Author(s):  
Sébastien Binet ◽  
Arthur Bongrand ◽  
Emmanuel Busato ◽  
Christophe Insa ◽  
Daniel Lambert ◽  
...  
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Mechanical Characteristics ◽  
Ion Beams ◽  
Cancer Treatments ◽  
Control Data ◽  
Data Comparison ◽  
Large Acceptance ◽  
Ballistic Control

This paper describes a small prototype of an in beam PET like detector, named ”Large Acceptance Pixelized Detector” (LAPD), developed to test technical concepts for the ion range control in the context of cancer treatments using proton or ion beams. The mechanical characteristics of this detector together with the read-out electronics are first presented. Then, results of a first experiment, performed on a 65 MeV proton beamline, are reported. Finally, we discuss the ability of Geant4 Monte-Carlo to reproduce the experimental data.

Study on the Relationship of the Quantity of CO2 Produced and the Wind Speed

2014 ◽  
Vol 881-883 ◽  
pp. 1638-1641
Author(s):  
Xian Long Sun ◽  
Er Xin Gao ◽  
Hong Fen Zhang ◽  
Qiang Wang ◽  
Li Juan Li
Keyword(s):  
Experimental Data ◽  
Wind Speed ◽  
Coal Seam ◽  
Coal Mine ◽  
Laboratory Experiments ◽  
Spontaneous Combustion ◽  
Geothermal Heat ◽  
Research Results ◽  
Relationship Of ◽  
The Relationship

Based on the geological and the experimental data of the13#coal seam of Sun-Cun Coal Mine, the relationship curve between the geothermal heat in Sun-Cun coal mine and experimental wind speed has been fit out.According this and the laboratory experiments,the relational expression between the quantity of CO2 produced in the period of spontaneous combustion and the wind speed in the coal mine has been developed. The research results show that when the wind speed exceeds 2m/s,the quantity of CO2 produced has a sharp rising tendency.

scholarly journals Effective FE models for simulating the elasto-mechanical characteristics of forming machines

2020 ◽  
Vol 106 (7-8) ◽  
pp. 3505-3514
Author(s):  
Robert Tehel ◽  
Thomas Päßler ◽  
Markus Bergmann
Keyword(s):  
Numerical Simulations ◽  
Mechanical Characteristic ◽  
Mechanical Characteristics ◽  
Physical Structure ◽  
Complex Interaction ◽  
Machine Design ◽  
Digital Representation ◽  
Effective Models

AbstractThe elasto-mechanical characteristic of forming machines is crucial for a variety of forming processes. Numerical simulations are to be performed to understand the complex interaction between process, forming tool, and machine. The machine’s elastic fingerprint depends on its design, accuracy of the components, and mounting conditions. Models only based on data of the machine design are limited. Therefore, effective FE models are to be developed to transfer the physical structure into a digital representation. The paper presents different methods of creating effective models for the characteristics of forming machines determined by measurements. Examples and potential of using these models are presented.

Design and Characterization of a Continuous Rotary Minimotor Based on Shape Memory Wires and Overrunning Clutches

2015 ◽  
Author(s):  
Giovanni Scirè Mammano ◽  
Eugenio Dragoni
Keyword(s):  
Shape Memory ◽  
Design Process ◽  
Low Friction ◽  
Maximum Torque ◽  
Output Torque ◽  
Large Rotations ◽  
Rotary Motor ◽  
High Output ◽  
Unidirectional Motion

An attractive but little explored field of application of the shape memory technology is the area of rotary actuators, in particular for generating endless motion. This paper presents a miniature rotary motor based on SMA wires and overrunning clutches which produces high output torque and unlimited rotation. The concept features a SMA wire tightly wound around a low-friction cylindrical drum to convert wire strains into large rotations within a compact package. The seesaw motion of the drum ensuing from repeated contraction-elongation cycles of the wire is converted into unidirectional motion of the output shaft by an overrunning clutch fitted between drum and shaft. Following a design process developed in a former paper, a six-stage prototype with size envelope of 48×22×30 mm is built and tested. Diverse supply strategy are implemented to optimize either the output torque or the speed regularity of the motor with the following results: maximum torque = 20 Nmm; specific torque = 6.31×10−4 Nmm/mm3; rotation per module = 15 deg; free continuous speed = 4 rpm.

Over-Temperature Forecasts on Electronic Packages Through a Transient R–C Model

1999 ◽  
Vol 122 (1) ◽  
pp. 42-47
Author(s):  
Ben-Je Lwo ◽  
Kun-Fu Tseng ◽  
Ching-Hsing Kao ◽  
Luke Su Lu
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Real Time ◽  
Electronic Packaging ◽  
Input Power ◽  
Electronic Packages ◽  
Temperature Prediction ◽  
Steady State Temperature ◽  
New Methodologies ◽  
Capacitance Model

Based on experimental data, a simple R–C (thermal resistance–heat capacitance) model with software precaution strategies are proposed in this paper to predict the steady-state temperature of the circuit in an electronic packaging in real time. Further developments on the new methodology lead to real time monitoring if input power and/or the environment are changing during operations. It is concluded that the new methodologies, which make the over-temperature prediction much more reliable, efficient, sensible, and faster, can be easily employed for over-temperature protection designs on electronic packaging. [S1043-7398(00)00301-7]

The Modeling and Simulation of Pneumatic ABS Pressure Regulator Based on AMESim

2014 ◽  
Vol 971-973 ◽  
pp. 811-815 ◽  
Author(s):  
Tian Fei Ma ◽  
Qian Chen
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Modeling And Simulation ◽  
Simulation Model ◽  
Dynamic Characteristics ◽  
Commercial Vehicle ◽  
Static Characteristics ◽  
Pressure Regulator ◽  
Characteristic Curves ◽  
Good Agreement

The pneumatic ABS pressure regulator of commercial vehicle is submitted to study in this paper. Its structure and operating principle are introduced, and a simulation model based on the AMESim is established on the basis of its mathematical model. Then the static characteristics and dynamic characteristics are researched by simulation model and the characteristic curves are compared with experimental data for the verification. The results show that simulation curves and experiment curves are in good agreement, which can be tolerated in the engineering.

Research on Electrical Transmission System with Hydraulic Coupler

2013 ◽  
Vol 871 ◽  
pp. 77-82
Author(s):  
Ming Su ◽  
Zhong Ping Xi ◽  
Dong Min Zhu ◽  
Zhong Chang Gu ◽  
Heng Wang
Keyword(s):  
Simulation Model ◽  
Torsional Vibration ◽  
Mechanical Characteristics ◽  
Transmission System ◽  
Isolation Effect ◽  
Electrical Transmission ◽  
Characteristic Curves ◽  
Impact Process ◽  
Starting Process ◽  
Original Characteristic

In this paper, a simulation model of the electrical transmission system with hydraulic coupler is established based on the analysis of the mechanical characteristics of the motor, the original characteristic curves of the hydraulic coupler and the torque equations of the pump wheel and the turbine. The starting and impact process of the system are simulated and the results reveal the mechanism of the characteristics of the starting process of the system and the isolation effect of the torsional vibration of the hydraulic coupler.

Sign in / Sign up

Export Citation Format

Share Document