Non-Stationary Condition Torsional Vibration Monitoring Using Induction Machine Electromagnetic Torque Estimation

2008 ◽  
Author(s):  
Sh. Hedayati Kia ◽  
H. Henao ◽  
G.-A. Capolino
Keyword(s):  
Torsional Vibration ◽  
Induction Machine ◽  
Vibration Monitoring ◽  
Stationary Condition ◽  
Electromagnetic Torque ◽  
Torque Estimation

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

Error Considerations for Turbine-Generator Torsional Vibration Monitoring

2020 ◽  
Author(s):  
Jindrich Liska ◽  
Jan Jakl ◽  
Sven Kunkel
Keyword(s):  
Power Systems ◽  
Torsional Vibration ◽  
Gas Turbines ◽  
Measurement Errors ◽  
Power Plants ◽  
Signal To Noise Ratio ◽  
Vibration Monitoring ◽  
Turbine Generator ◽  
Turbine Generators ◽  
Incremental Encoder

Abstract Turbine-generator torsional vibration is linked to electrical events in the power grid by the generator air-gap torque. Modern power systems are subject to gradual transformation by increasing flexibility demands and incorporation of renewable resources. As a result, electrical transient events are getting more frequent and thus torsional vibration is getting more and more attention. Especially in the case of large steam and gas turbines torsional vibration can cause material fatigue and present a hazard for safe machine operation. This paper freely builds on previous work, where a method for torsional vibration evaluation using an incremental encoder measurement was presented, in that it supplements error considerations to this methodology. Measurement errors such as precision of the rotor encoder manufacturing, choice of the proper sensor, its signal to noise ratio and the error of instantaneous velocity computation algorithm are analyzed. The knowledge of these errors is essential for torsional vibration as there is an indirect and relatively complicated path from the measurement to the final torsional vibration results compared to other kinds of vibration. The characteristics of particular errors of the processing chain are validated both on experimental data from a test rig as well as field data measured on turbine-generators in power plants.

scholarly journals Speed Control Strategy for Three Phase Induction Machine Fed Inverter Base on Carrier Base Pulse Width Modulation (CBPWM)

2020 ◽  
Vol 5 (1) ◽  
pp. 14
Author(s):  
I Ketut Wiryajati ◽  
A.D Giriantari ◽  
Lie Jasa ◽  
I N. S. Kumara
Keyword(s):  
Induction Motor ◽  
Pulse Width Modulation ◽  
Induction Motors ◽  
Induction Machine ◽  
Input Voltage ◽  
Motor Speed ◽  
Good Efficiency ◽  
Speed Regulation ◽  
Torque Estimation ◽  
Three Phase

Abstract— An induction motors  (IM) in many industries is used because it has several advantages, such as a very simple and strong construction, the price is relatively cheap, has good efficiency, power factor is quite good, and maintenance is easier. Besides the advantages of induction motors also have disadvantages, one disadvantage of induction motors is not being able to maintain a constant speed when there is a change in load. If the load changes, the speed of the induction motor will decrease. One method of regulating the speed of an induction motor presented in this study is the regulation of an induction motor using a carrier based PWM (CBPWM) inverter with the field oriented control  (FOC) technique. The estimation of rotor rotation, torque and flux is done by carrier- based PWM  technique which is given input voltage and stator current. To achieve the desired flux and torque, estimation is used as feedback in the control system. In this study, it will be simulated the induction motor speed regulation with a carrier base-based inverter using Matlab. The results obtained through simulation show the length of time to reach the reference speed for speeds of 1500 rpm and 1450 rpm is around 0.45 seconds. And THD  average 2,675%.

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