A Simplified Indirect Technique for the Measurement of Mechanical Power in Three-Phase Asynchronous Motors

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
Giovanni Bucci ◽  
Fabrizio Ciancetta ◽  
Edoardo Fiorucci ◽  
Antonio Ometto ◽  
Maria Anna Segreto
Keyword(s):  
Induction Motors ◽  
Low Cost ◽  
Electrical Power ◽  
Voltage Divider ◽  
Mechanical Power ◽  
Phase Current ◽  
Power Characteristics ◽  
Asynchronous Motors ◽  
Three Phase ◽  
Indirect Technique

Abstract This paper presents an indirect method for measuring the mechanical power produced by three-phase induction motors. The proposed technique is based on the hypothesis that three-phase induction motors are balanced systems that transform electrical power into mechanical one. The measurement of a single phase current is used to estimate the mechanical power generated at the axis. The relationship between electric current and mechanical power is generally non-linear. By expressing the quantities in p.u., this trend is approximated with a second order polynomial. From the analysis of the mechanical power characteristics related to 13 motors we obtained the parameters of the interpolating parabolic curves of motors from 1.1 kW to 75 kW rated power. The proposed technique can be easily adopted in order to monitor the mechanical power of three phase induction motors using only one phase current transducer. Starting from the motor nameplate no experimental measurement or other data are necessary to estimate the mechanical power. This technique can be widely used in low cost multipoint measurement system able to monitor the mechanical power where no other transducer or voltage divider are necessary.

scholarly journals A Low-Cost IoT Sensors Network for Monitoring Three-Phase Induction Motor Mechanical Power Adopting an Indirect Measuring Method

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 754
Author(s):  
Fabrizio Ciancetta ◽  
Edoardo Fiorucci ◽  
Antonio Ometto ◽  
Andrea Fioravanti ◽  
Simone Mari ◽  
...  
Keyword(s):  
Induction Motors ◽  
Low Cost ◽  
Measuring Method ◽  
Indirect Measurement ◽  
Point Of View ◽  
Operating Conditions ◽  
Mechanical Power ◽  
Three Phase ◽  
Energetic Point ◽  
The Cost

Three-phase induction motors are widely diffused in the industrial environment. Many times, the rated power of three-phase induction motors is not properly chosen causing incorrect operating conditions from an energetic point of view. Monitoring the mechanical dimension of a new motor is helpful, should an existing motor need to be replaced. This paper presents an IoT sensors network for monitoring the mechanical power produced by three-phase induction motors, adopting an indirect measuring method. The proposed technique can be easily adopted to monitor the mechanical power using only one line of current transducer, reducing the cost of the monitoring system. The proposed indirect measurement technique has been implemented on a low-cost IoT system, based on a Photon Particle SoC. The results show that the proposed IoT system can estimate the mechanical power with a relative error of within 8%.

scholarly journals Methods of Vector Control for Induction Motors

2018 ◽  
Vol 11 (4) ◽  
pp. 165-184
Author(s):  
László Varga ◽  
Miklós Kuczmann
Keyword(s):  
Mathematical Models ◽  
Vector Control ◽  
Induction Motors ◽  
Control Model ◽  
Motor Drive ◽  
Field Oriented Control ◽  
Induction Motor Drive ◽  
Asynchronous Motors ◽  
Three Phase ◽  
Space Vectors

This paper presents the electrical and mathematical models of the three phase asynchronous motors along with the introduction of the field-oriented control model as well as the vector transformations needed for the introduction of the above mentioned terms. The objective of the present paper is to introduce the space vectors and how to build the field-oriented control for a given induction motor drive as well as the transformations and the modell of field oriented control.

scholarly journals Pengaruh Kinerja Motor Induksi Pada Tegangan Tidak Seimbang Dengan Metode Transformasi Direct Qudrature

AVITEC ◽  
2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Paulus Setiawan
Keyword(s):  
Induction Motor ◽  
Electromagnetic Induction ◽  
Induction Motors ◽  
Electrical Power ◽  
Transformation Method ◽  
Phase Voltage ◽  
Electrical Power System ◽  
Stator Current ◽  
Three Phase ◽  
Unbalanced Voltage

Induction motors are one type of electric motors that work based on electromagnetic induction. The problem that often arises lately is the occurrence of voltage imbalances. Unbalanced voltage is a voltage value that is not the same in a three-phase voltage system contained in the electrical power system. On the basis of these problems, it is necessary to conduct research that can analyze the dynamics of the performance of an induction motor. Dynamic analysis is done by modeling a three-phase induction motor using an arbitrary reference frame with the direct qudrature transformation method in Matlab/Simulink. In studies with voltage imbalances up to 5%, electromagnetic torque has decreased by 2.89% to 13.83% and stator current in one phase has increased by 29.1% to 245.8%.

Passive Wireless Sensing of Temperature Using RF Technology

2007 ◽  
Author(s):  
Miaogeng Zhang ◽  
Luis Gonzalez-Argueta ◽  
V. Sundararajan
Keyword(s):  
Low Cost ◽  
Voltage Divider ◽  
Sensor Nodes ◽  
Measured Signal ◽  
Wireless Sensing ◽  
Function Generator ◽  
Variable Resistor ◽  
Power Characteristics ◽  
Rf Design ◽  
Loop Antennas

Sensor networks are emerging as an attractive technology for deployment in monitoring applications due to their flexibility, small size, ease of installation, low cost and low power characteristics. Since the wireless nodes use batteries as energy sources, their operating lives are limited by the life of the batteries. Replacing batteries periodically in a sensor network can be a burden as the nodes may be dispersed over a wide area. Moreover the battery increases the size of the sensor nodes and offsets one of the primary advantages of such networks. This study proposes a design for wireless sensing of temperature based on passive RF-technology. The experimental setup includes: 1) signal generator 2) sensor tag 3) receiver. The carrier signal is produced by function generator. The sensor tag consists of a voltage divider circuit combined with loop antennas. The sensor tag filters the carrier signal and transmits back a modulated signal of the same frequency. The variable resistor acting as a thermistor is connected as a voltage divider. The change in amplitude of the output signal is relative to the temperature change. Experimental results show that the passive RF design can be effective way for wireless temperature monitoring. The results can be generalized to any sensor that converts the measured signal into a change of resistance.

Analysis of Balanced Three-Phase Induction Motor Performance under Unbalanced Supply using Simulation and Experimental Results

1970 ◽  
Vol 109 (3) ◽  
pp. 41-45 ◽  
Author(s):  
I. Temiz ◽  
C. Akuner ◽  
H. Calik
Keyword(s):  
Power Systems ◽  
Power System ◽  
Induction Motor ◽  
Induction Motors ◽  
Electrical Power ◽  
Electrical Power System ◽  
Current Harmonics ◽  
Operation Analysis ◽  
Simulink Model ◽  
Three Phase

Induction motors are known to affect the electrical power system in terms of harmonics. Induction motors fed by unbalanced power systems produce additional current harmonics. These harmonics cause additional power losses in the machine. The method of symmetrical components is often used in this kind of unbalanced operation analysis. In this study, the performance of a three phase induction motor supplied by unbalanced power system due to the various causes has been examined using both experimental method and Matlab/Simulink model. Ill. 11, bibl. 6, tabl. 6 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.167

scholarly journals Identification of Stator Winding Insulation Faults in Three-Phase Induction Motors Using MEMS Accelerometers

Proceedings ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 66
Author(s):  
Karl Schiewaldt ◽  
Guilherme Lucas ◽  
Marco Rocha ◽  
Claudio Fraga ◽  
Andre Andreoli
Keyword(s):  
Fault Diagnosis ◽  
Vibration Analysis ◽  
Induction Motors ◽  
Low Cost ◽  
Industrial Sector ◽  
Mems Devices ◽  
Mems Accelerometer ◽  
Three Phase ◽  
Special Cases ◽  
Mems Accelerometers

In recent years, the advancement of the microelectronics industry has allowed for a major expansion in the development of sensor-based equipment and applications, driven primarily by the cost reduction of micro-electro-mechanical systems (MEMS) devices. Currently, using this type of component, it is feasible to develop cost-effective systems aimed at early detection of failures in electrical machines and, in special cases, three-phase induction motors (TIM). These devices, coupled with predictive maintenance records, can prevent unexpected shutdowns due to malfunctions and signal the need for actions to extend the life cycle of the equipment. This is a relevant topic considering that the industrial sector is increasingly seeking for solutions based on non-destructive techniques (NDT) for preventive and predictive fault diagnosis. In this scenario, the objective of this work is to evaluate the application of a low-cost MEMS accelerometer to identify insulation failures in stator windings through vibration analysis. For this purpose, two MEMS accelerometers were coupled on either side of the frame of a TIM. Then, vibration signals were acquired for different types and levels of insulation failures. The data obtained were processed using different metrics such as root mean square (RMS), kurtosis, and skewness. The results allowed us to identify the insulation faults applied to the TIM, confirming the feasibility of applying the low-cost MEMS accelerometer in the vibration analysis for fault diagnosis.

Low-Cost Wireless Speed Control and Fault Mitigation of Three-Phase Induction Motor

2021 ◽  
pp. 150-162
Author(s):  
Priya Vijayvargiya ◽  
Arun Parakh
Keyword(s):  
Induction Motors ◽  
Control Method ◽  
Low Cost ◽  
Speed Control ◽  
Mobile App ◽  
Three Phase ◽  
Electrical Faults ◽  
Fault Clearance ◽  
User Friendly ◽  
Design Proposal

This chapter presents a design proposal for low-cost speed control and electrical fault mitigation of three-phase induction motors. The proposed system can control and monitor TIMs (three-phase induction motors) from far-flung areas. Here authors have proposed a relay-free system for fast fault clearance. IoT technology and low-cost microcontrollers have helped in achieving a system that is more reliable, economical, user friendly, and fast. It can be controlled by mobile application at the comfort of home. Data related to fault occurrence can be stored and analyzed for preventive maintenance. V/f scalar control method is used for speed control of TIM and able to control it in a wide range. Electrical faults such as over-current, over-temperature, over-voltage, and under-voltage are considered in this chapter. Simulation of the proposed design is done using Proteus 8 software. ESP32 is used to runs a web server that connects the mobile app with simulation.

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