scholarly journals Experimental Investigations of Instantaneous Angular Speeds and Torsional Vibration in an AC Motor Driven Rotor System Involving a Variable Frequency Drive

2021 ◽  
Author(s):  
Mina Nozohouri
Keyword(s):  
Torsional Vibration ◽  
Dynamical Behavior ◽  
Experimental Investigations ◽  
Variable Frequency ◽  
Motor Speed ◽  
Variable Frequency Drive ◽  
Arrival Times ◽  
Wide Range ◽  
Complex Motor ◽  
Ac Induction Motor

Torsional vibration of a complex electro-mechanical system consisting of a VFD controller and AC induction motor is investigated in this thesis to study the dynamical behavior of a rather complex motor drive, used to power a DC generator and a set of heat-generation resistors for achieving various levels of nominal loads over a wide range of nominal frequencies/speeds. Two magnetic encoders are placed at two locations to record the arrival times of two arrays of teeth in connection with a data acquisition system. Through a Matlab-coded algorithm, the instantaneous angular speeds and their harmonic compositions up to 16th order of the mean motor speed can be accurately discerned. The model and the algorithms developed in this thesis can be used in a variety of machines and testing systems powered by induction motors and regulated by variable-frequency-drive controllers for design, condition monitoring and identification of sources of noise and disastrous vibration.

scholarly journals Experimental Investigations of Instantaneous Angular Speeds and Torsional Vibration in an AC Motor Driven Rotor System Involving a Variable Frequency Drive

2021 ◽  
Author(s):  
Mina Nozohouri
Keyword(s):  
Torsional Vibration ◽  
Dynamical Behavior ◽  
Experimental Investigations ◽  
Variable Frequency ◽  
Motor Speed ◽  
Variable Frequency Drive ◽  
Arrival Times ◽  
Wide Range ◽  
Complex Motor ◽  
Ac Induction Motor

Torsional vibration of a complex electro-mechanical system consisting of a VFD controller and AC induction motor is investigated in this thesis to study the dynamical behavior of a rather complex motor drive, used to power a DC generator and a set of heat-generation resistors for achieving various levels of nominal loads over a wide range of nominal frequencies/speeds. Two magnetic encoders are placed at two locations to record the arrival times of two arrays of teeth in connection with a data acquisition system. Through a Matlab-coded algorithm, the instantaneous angular speeds and their harmonic compositions up to 16th order of the mean motor speed can be accurately discerned. The model and the algorithms developed in this thesis can be used in a variety of machines and testing systems powered by induction motors and regulated by variable-frequency-drive controllers for design, condition monitoring and identification of sources of noise and disastrous vibration.

Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit

2010 ◽  
Vol 57 (4) ◽  
pp. 393-404
Author(s):  
Riza Gürbüz
Keyword(s):  
Flow Control ◽  
Flow Rate ◽  
Control Unit ◽  
Control Flow ◽  
Variable Frequency ◽  
Motor Speed ◽  
Fluid Level ◽  
Drive Unit ◽  
Variable Frequency Drive ◽  
Ac Drive

Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit The Variable Frequency Drive (VFD) is used to control the speed of the pumpmotor to attain the desired flow rate and fluid level in a fluid system. An AC drive provides efficient flow control by varying the pump-motor speed. The comparison of energy requirements and costs in a system where a throttling device is used for flow control on a centrifugal pump with the power used when an variable frequency drive (VFD) is used to control the same flow, evidently shows potential savings. In this system, AC Motor Frequency drive and static pressure transmitter, turbine type flowmeter and Analog/Digital cards, micro-control unit and computer connection are designed specially to control flow rate, fluid flow type (turbulence or laminar) and water level at the different conditions with different PID parameters.

scholarly journals UNJUK KERJA DAN PEMANFAATAN INVERTER SEBAGAI PENGENDALI KECEPATAN MOTOR INDUKSI 3 PHASA

2013 ◽  
Vol 5 (2) ◽  
pp. 87-92
Author(s):  
Anton Anton ◽  
Tuti Angraini
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Low Cost ◽  
Variable Frequency ◽  
Variable Speed ◽  
Motor Speed ◽  
Insulated Gate Bipolar Transistor ◽  
Normal Speed ◽  
Domestic Environments ◽  
Ac Induction Motor

The Induction motors are found in industrial and domestic environments because of low cost of operation including, induction motors are widely used induction motor 1 phase and 3 phase. During operation of induction motors generally used at normal speed, but the specific purpose induction motors operated with variable speed. In order to obtain varying motor speed can be controlled using the inverter. The use of inverters here to give supplay voltage AC induction motor in which the magnitude of the frequency can be varied. Setting frequency of the inverter utilizing method pulse with modulation (PWM). The circuit used to build PWM, using Insulated Gate Bipolar Transistor (IGBT) technology. Values ​​obtained variable frequency ranging from 4 Hz to 50 Hz, and acquired motor speed ranging from 12 rpm up to 1390 rpm.

A Study on Variable Frequency Control of Precooling Pump Motors

2013 ◽  
Vol 325-326 ◽  
pp. 1233-1236
Author(s):  
Xing Jin ◽  
Chang Hong Jiang ◽  
Xiang Guang Li
Keyword(s):  
High Efficiency ◽  
Frequency Control ◽  
Simulation Software ◽  
Air Separation ◽  
Variable Frequency ◽  
Motor Speed ◽  
Adjustment Problems ◽  
Pump System ◽  
Simulink Simulation ◽  
Ac Induction Motor

Based on the energy-saving principle of variable frequency and energy adjustment, problems on application of the optimization table method of voltage vector in AC frequency control of motor speed adjusting are mainly emphasized by analysis on precooling system of air separation in this paper. With the help of Matlab/Simulink simulation software, the simulation model of the control system of the AC induction motor is built, and a method of frequency and speed adjusting control of the motor based on dsPIC is put forward. Furthermore, this technology is applied in the precooling pump system of air separation, and a full digital SPWM variable frequency and speed adjusting system with low energy consumption, high efficiency and good dynamic is constructed.

scholarly journals Repairing and commissioning of an AC motor speed controller for a centrifugal pump

2019 ◽  
Vol 1 (2) ◽  
pp. 47
Author(s):  
Md. Touhid Nur Rahman ◽  
Md. Momin Turzo ◽  
Ahammed Masum Billah ◽  
Md. Masum Akanda ◽  
Md. Rahat Rahman
Keyword(s):  
Centrifugal Pump ◽  
Performance Test ◽  
Dc Motor ◽  
Project Work ◽  
Motor Speed ◽  
Variable Frequency Drive ◽  
Speed Controller ◽  
Engineering Department ◽  
Long Time ◽  
Ac Induction Motor

A centrifugal pump was installed in 1984 in the Fluid Mechanics Laboratory of Mechanical Engineering Department of Rajshahi University of Engineering & Technology. The motor of the centrifugal pump was dc motor and was not working. It could not be commissioned for a long time because of the damaged speed controller. The main shaft (rotor) was also jammed. In this project work, the dc motor was tried to repair. But it could not be run because the specification of the motor and the operating manual was not available. To complete the project successfully, the dc motor was replaced by an ac induction motor. After replacing the motor, the speed of the new motor was controlled by a variable frequency drive (VFD). Using this device, the speed was controlled from 600 rpm to 3000 rpm smoothly. After the replacement, the testing of the centrifugal pump was successfully performed and the motor was controlled in various speeds. Experiment on the performance test of the centrifugal pump was carried out satisfactorily running the pump in various speeds operated by the VFD.

scholarly journals Torsional Vibration Analysis of Shaft in an Induced Draft Fan Due to Variable Frequency Drive

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 174723-174735
Author(s):  
Qingjie Zhang ◽  
Guangxiang Lu ◽  
You Xu ◽  
Chengyu Zhang
Keyword(s):  
Torsional Vibration ◽  
Vibration Analysis ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Induced Draft Fan

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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