Operation of the induction motor in non-sinusoidal voltage supply conditions

2020 ◽  
Vol 8 (1) ◽  
pp. 13-20
Author(s):  
Tomasz Drabek ◽  
Krzysztof Krzyściak
Keyword(s):  
Induction Motor ◽  
Theoretical Basis ◽  
Induction Motors ◽  
Load Capacity ◽  
Mathematical Expression ◽  
Test Results ◽  
Sinusoidal Voltage ◽  
Torque Load ◽  
American Standard ◽  
Measurement Verification

The paper presents the theoretical basis of the mathematical expression derived from the American standard, used to determine the thermally permissible torque load capacity of the cage induction motors when supplied with distorted voltages. The results of the measurement verification of this expression for different voltage shapes supplying the tested motor are presented. The test results confirmed the correctness of the expression when the motor is supplied with distorted voltage with a limited number of higher harmonics.

Calculation of Cylindrical Worm Gear Drives of Different Tooth Profiles

1981 ◽  
Vol 103 (1) ◽  
pp. 73-82 ◽  
Author(s):  
H. Winter ◽  
H. Wilkesmann
Keyword(s):  
Coefficient Of Friction ◽  
Theoretical Basis ◽  
Power Loss ◽  
Influence Factor ◽  
Load Capacity ◽  
Worm Gear ◽  
Important Influence ◽  
Test Results ◽  
The Coefficient Of Friction ◽  
Gear Drives

The formulae of classical hydrodynamics are not suitable for the calculation of load capacity and power loss of worm gear drives. Thus a theoretical basis had to be developed for the comparison of different tooth profiles, materials of worm and worm wheel and lubricants. The data obtained were compared with test results. It proved that the coefficient of friction is an important influence factor.

scholarly journals The Analysis Of 3 Phase 1 HP Induction Motor Efficiency In Under Voltage And Over Voltage Condition With PSIM Simulation

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Sohih Ajie Prabowo ◽  
Wakhyu Dwiono ◽  
Arif Johar Taufiq
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Phase 1 ◽  
Input Power ◽  
Test Results ◽  
Motor Efficiency ◽  
Three Phase ◽  
Core Losses ◽  
Loss Method

Three phase induction is the most common motor and is widely used in various industrial equipment because of all the advantages. To get the best performance, the quality of powersupply of induction motors needs to be maintained. One of the problems that arise in power quality is under voltage or over voltage. In this study the calculation and analysis of efficiency using the segregated loss method of 3 phase induction motors connected to stars and delta on the under voltage and over voltage conditions of the rating voltage, and at the rating voltage, the motor used is a 3 Phase 1 HP 4 pole induction motor with voltage rating of 380 volts. The method used is the segregated loss method, this method is a method to get the value of the efficiency of the induction motor by finding and separating the value of loss and loss, the method used refers to IEEE 112. Simulation using PSIM software as a hypothesis and comparison, variables taken are speed, current, inter-phase voltage and input power. Based on the results of calculations from all experiments show that the induction motor will produce better efficiency at loads approaching its capacity, and under voltage and over voltage conditions affect the efficiency value with a small difference in each change in voltage conditions. Efficiency values in all star motor voltage conditions range between 44% - 52% and in delta connection motor ranges between 39% - 42%. Simulations carried out using PSIM software produce higher efficiency than the test results with a range of values of 67% -78%, where the value is calculated from the simulation results and ignoring core losses.

scholarly journals Eddy Currents Based Stray Loss Model For Variable Load Conditions of Medium Power Induction Motors

2021 ◽  
Author(s):  
Rajendra Kumar ◽  
Praveen Kumar ◽  
Teruo Kanekawa ◽  
Koji Oishi
Keyword(s):  
Magnetic Field ◽  
Induction Motor ◽  
Eddy Currents ◽  
Induction Motors ◽  
Variable Load ◽  
Test Results ◽  
Loss Model ◽  
Development And Validation ◽  
The Impact ◽  
The Magnetic Field

<div>This paper presents an eddy current based stray loss model for induction motors taking into account the impact of motor’s loading. The model uses the various motor inductances and, other nameplate data of an induction motor as primary variables. The Magnetic field distribution in a motor is prominently affected by the stator and rotor slot geometries. Distortions in the magnetic field have a direct impact on SL as well as on various inductances of the motor. The development and validation of the model is accomplished by testing total 26 numbers of induction motors of different geometries and materials at different loading conditions. In a further step, the applicability of the model in designing an IM is presented by re-designing a 75kW induction motor and comparing the experimental test results with the initial IM.</div>

Design and Construction of a Mini Magnetic Levitation Train

2019 ◽  
Vol 891 ◽  
pp. 253-262
Author(s):  
Sakhon Woothipatanapan ◽  
Poonsri Wannakarn
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Magnetic Levitation ◽  
The Body ◽  
Test Results ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Drive Speed ◽  
The Magnetic Field ◽  
Design And Construction

This article presents the design and construction of a mini magnetic levitation train. The design of the train is based on the theory of 3-phase Linear Induction Motor (LIM). The train consists of two main sections. The first part is the linear induction motor, which is the part that drives the train to move. The second part is the magnetic field winding, which is the part that raises the body of the train to float over the rails. Such train can move forward/backward in the same principle as forward/reverse rotation control of 3-phase induction motors. For that reason, this research controls the forward/backward movement of the train with a magnetic contactor set by using the same circuit as the control of the rotation of the 3-phase induction motor. The designed train can lift 1 mm above the rails and move within a distance of 1.48 m along the length of the rails. The test results showed drive voltage, drive force, average time and drive speed of the train. From the details and results of this article can be used as a guide to create a larger magnetic levitation train, which can be used more effectively.

Calculation of Additional Losses Caused by Feeding an Induction Motor from a Non-Sinusoidal Supply

1995 ◽  
Vol 32 (1) ◽  
pp. 51-62
Author(s):  
S. A. Eldhemy ◽  
A. A. Mohamed ◽  
S. S. Shokralla
Keyword(s):  
Numerical Methods ◽  
Equivalent Circuit ◽  
Induction Motor ◽  
Induction Motors ◽  
Test Results ◽  
Additional Losses ◽  
Theoretical Results

Calculation of additional losses caused by feeding an induction motor from a non-sinusoidal supply The authors present an equivalent circuit for induction motors fed from a non-sinusoidal supply, The equivalent circuit presented takes into consideration the effect of stray fields. The validity of the theoretical results is checked by test results. The paper presents numerical methods to compute the different loss elements.

scholarly journals Eddy Currents Based Stray Loss Model For Variable Load Conditions of Medium Power Induction Motors

2021 ◽  
Author(s):  
Rajendra Kumar ◽  
Praveen Kumar ◽  
Teruo Kanekawa ◽  
Koji Oishi
Keyword(s):  
Magnetic Field ◽  
Induction Motor ◽  
Eddy Currents ◽  
Induction Motors ◽  
Variable Load ◽  
Test Results ◽  
Loss Model ◽  
Development And Validation ◽  
The Impact ◽  
The Magnetic Field

<div>This paper presents an eddy current based stray loss model for induction motors taking into account the impact of motor’s loading. The model uses the various motor inductances and, other nameplate data of an induction motor as primary variables. The Magnetic field distribution in a motor is prominently affected by the stator and rotor slot geometries. Distortions in the magnetic field have a direct impact on SL as well as on various inductances of the motor. The development and validation of the model is accomplished by testing total 26 numbers of induction motors of different geometries and materials at different loading conditions. In a further step, the applicability of the model in designing an IM is presented by re-designing a 75kW induction motor and comparing the experimental test results with the initial IM.</div>

Starting Processes in Electric Drive of a Passenger Elevator

2021 ◽  
Vol 1 (1) ◽  
pp. 40-49
Author(s):  
S. Rachev ◽  
K. Dimitrova ◽  
D. Koeva ◽  
L. Dimitrov
Keyword(s):  
Coordinate System ◽  
Induction Motor ◽  
Electric Drive ◽  
High Speed ◽  
Induction Motors ◽  
Dynamic Loads ◽  
Design Stage ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Electric Induction

During the operation of electric induction motors used to drive passenger elevators, electro-mechanical transient processes occur, which can cause unacceptable dynamic loads and vibrations. In this regard, research is needed both at the design stage and for operating elevator systems to determine the arising impact currents and torques, in order to propose solutions for their limitation within pre-set limits. Paper deals with starting processes in a two-speed induction motor drive of a passenger elevator. The equations for the voltages of the induction motor are presented in relative units in a coordinate system rotating at a synchronous speed. The values have been obtained for the torques, the rotational frequencies and the currents when starting at a high speed and passing from high to low speed.

Two important bridges protected from earthquake by extremely big sliding pendulum isolators

2021 ◽  
Author(s):  
Agostino Marioni ◽  
Roberto Dalpedri ◽  
Marco Banfi ◽  
Carla Cai
Keyword(s):  
Load Capacity ◽  
Special Focus ◽  
South East Asia ◽  
Vertical Load ◽  
Test Results ◽  
Surface Type ◽  
Total Length ◽  
Padma River ◽  
The Difference ◽  
Under Construction

<p>The Padma Bridge is a multipurpose road-rail bridge across the Padma River currently under construction in Bangladesh and is one of the most important projects in the whole south east Asia with a total length of 6150 m. The maximum design vertical load reaches 98725 kN.</p><p>The Holtekamp Bridge is a steel road bridge with 2 main spans of 150 m and 2 lateral spans of 75 for a total length of 450 m. The bridge is isolated by use of sliding pendulum isolators having a maximum vertical load capacity at ULS of 54915 kN.</p><p>In both cases the isolators are double sliding surface type but with a different approach about the central articulation. The paper aims to put in evidence the difference in behaviour of the 2 types of pendulum, analysing both the theoretical approach and the test results with a special focus over the adopted solution for perform the test on a device which exceed the capacity of aby existing laboratory.</p>

Research and Application of Energy Saving Technology of Inverter in Light Load

2014 ◽  
Vol 577 ◽  
pp. 498-501
Author(s):  
Jiu Yan Zhou
Keyword(s):  
Energy Saving ◽  
Induction Motor ◽  
Induction Motors ◽  
Speed Control ◽  
Variable Frequency ◽  
Light Load ◽  
Variable Voltage ◽  
Energy Saving Technology

In order to analysis the variable-voltage energy saving theory and its implementation for induction motor with light-load in detail, This paper gives out a variable-voltage energy saving method, and discusses the design of variable frequency adjusting speed control and the points of attention. It is useful for the application of energy saving technology for induction motors.

scholarly journals An Improved Method for Discerning Broken Rotor Bar Fault and Load Oscillation in Induction Motors

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3130 ◽  
Author(s):  
Liling Sun ◽  
Boqiang Xu
Keyword(s):  
Spectral Analysis ◽  
Theoretical Basis ◽  
Induction Motors ◽  
The Other ◽  
Improved Method ◽  
Broken Rotor Bar ◽  
Signal Parameters ◽  
Analysis Technique ◽  
Novel Strategy ◽  
The One

A few methods for discerning broken rotor bar (BRB) fault and load oscillation in induction motors have been reported in the literature. However, they all perhaps inevitably fail in adverse cases in which these two phenomena are simultaneously present. To tackle this problem, an improved method for discerning BRB fault and load oscillation is proposed in this paper based on the following work. On the one hand, the theoretical basis is analytically extended to include such an adverse case, yielding some important findings on the spectra of the instantaneous reactive and active powers. A novel strategy is thus outlined to correctly discern BRB fault and load oscillation even when simultaneously present. On the other hand, Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT) is adopted as the spectral analysis technique to deal with the instantaneous reactive and active powers, yielding a certain improvement compared to the existing methods, adopting Fast Fourier Transform (FFT). Simulation and experimental results demonstrate that the proposed method can correctly discern BRB fault and load oscillation even when simultaneously present.

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