scholarly journals Performance Improvement of Grid-Connected Induction Motors through an Auxiliary Winding Set

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2178
Author(s):  
Luigi Danilo Tornello ◽  
Salvatore Foti ◽  
Mario Cacciato ◽  
Antonio Testa ◽  
Giacomo Scelba ◽  
...  
Keyword(s):  
Induction Motor ◽  
Performance Improvement ◽  
Power Factor ◽  
Induction Motors ◽  
Power Conversion ◽  
Grid Current ◽  
Feasibility Assessment ◽  
Start Up ◽  
Conversion System

A technique to improve the performance of grid-connected induction motors by exploiting an auxiliary winding set is proposed in this paper. This auxiliary winding features the same distribution of the main winding, although with a reduced number of turns and it is fed by an inverter a fraction of the power in comparison with the rated size of the induction motor. As shown in the paper, through the auxiliary winding, it is possible to set the machine power factor, increasing the efficiency of the power conversion system and mitigating speed oscillations due to torque disturbances. A mitigation of the grid current peaks due to motor start-up is obtainable. First, the proposed technique is theoretically introduced, then a feasibility assessment is accomplished by simulations.

scholarly journals Windings Design for Single-phase Induction Motors Base on 4-phase Induction Motor (Case study: identical windings design)

2018 ◽  
Vol 215 ◽  
pp. 01023 ◽  
Author(s):  
Zuriman Anthony ◽  
Erhaneli Erhaneli ◽  
Zulkarnaini Zulkarnaini
Keyword(s):  
Induction Motor ◽  
Power Factor ◽  
Single Phase ◽  
Induction Motors ◽  
Three Phase ◽  
Motor Design

A 1-phase induction motor usually has a complicated windings design which compares to polyphase induction motor. In addition, a large capacitor start is required to operate the motor. It is an expensive way to operate the motor if it compare to polyphase induction motor. So, a new innovation method is required to make the motor more simple and cheaper. This research is purposed to study a new winding design for a single-phase capacitor motor. Winding design of the motor was conducted to a simple winding design like a 4-phase induction motor that has four identical windings. The comparator motor that use in this study was a Three-phase induction motor with data 1400 RPM, 1.5 HP, 50Hz, 380/220V, Y/Δ, 2.74/4.7A, 4 poles, that had the same current rating which the proposed method. The result showed that the motor design on this proposed method could be operated at 88.18 % power rating with power factor close to unity.

Generation and Control of Electricity in HTGR Helium Turbine Plant

2002 ◽  
Author(s):  
K. N. Pradeep Kumar ◽  
A. Tourlidakis ◽  
P. Pilidis
Keyword(s):  
South Africa ◽  
Power Plants ◽  
Transient Stability ◽  
Power Conversion ◽  
Engineering Project ◽  
Turbine Plant ◽  
Start Up ◽  
Conversion System ◽  
And Control ◽  
Operational Aspects

This paper analyses the operational aspects of a temperature Gas Reactor using direct Helium Cycle for power conversion. As an engineering project, the complexity in the operational aspects of HTGR’s is more severe than that of its design and installation. Its transient stability is achieved in a different manner compared to conventional power plants. An efficient and steady operation is a must for its successful realization. The paper looks into the start-up, shutdown and part load performance of helium power conversion system. The study is based on an ongoing developmental project in South Africa called Pebble Bed Modular Reactor (PBMR).

Experimental Investigation and Analysis of Induction Motors Operation under Single-Phasing Condition

2020 ◽  
Vol 8 (2) ◽  
pp. 90-99
Author(s):  
Basim Alsayid
Keyword(s):  
Experimental Investigation ◽  
Induction Motor ◽  
Power Factor ◽  
Induction Motors ◽  
Input Power ◽  
Comparative Approach ◽  
Protective Device ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Factor Input

A three-phase induction motor will continue to operate when a disturbance of some sort causes the source voltages of the motor to become unbalanced. When an induction motor is operated at unbalanced voltage supply the performance characteristics like efficiency, power factor, input power, output power and losses are affected.  The single-phasing occurs when one phase fails as a result of a fuse blowing, protective device opening on one phase of the motor, open phase on one terminal of the motor or other causes. This paper will analyze the operation of a 3-phase induction motor under normal balanced source voltages first, then under single phasing experimentally in order to follow a comparative approach.

Dynamic Simulation Analysis of Heavy Load Starting Light Load Running Induction Motor with High-Performance

2012 ◽  
Vol 588-589 ◽  
pp. 526-529
Author(s):  
Feng Ge Zhang ◽  
Hong Yong Xia
Keyword(s):  
Induction Motor ◽  
Dynamic Simulation ◽  
Power Factor ◽  
High Performance ◽  
Induction Motors ◽  
Simulation Analysis ◽  
State Equation ◽  
Heavy Load ◽  
Operation Efficiency ◽  
Light Load

For the problem of heavy load starting induction motors in operation efficiency and power factor are low, a kind of heavy load starting light load running induction motor with high-performance is presented. In order to study the feasibility of this motor, the state equation of the motor is established and the dynamic simulation program of the motor is compiled. Finally, the program is simulated using software and the simulation result is analyzed.

Experimental Investigation and Analysis of Induction Motors Operation under Single-Phasing Condition

2020 ◽  
Vol 8 (2) ◽  
pp. 90-99
Author(s):  
Basim Alsayid
Keyword(s):  
Experimental Investigation ◽  
Induction Motor ◽  
Power Factor ◽  
Induction Motors ◽  
Input Power ◽  
Comparative Approach ◽  
Protective Device ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Factor Input

A three-phase induction motor will continue to operate when a disturbance of some sort causes the source voltages of the motor to become unbalanced. When an induction motor is operated at unbalanced voltage supply the performance characteristics like efficiency, power factor, input power, output power and losses are affected.  The single-phasing occurs when one phase fails as a result of a fuse blowing, protective device opening on one phase of the motor, open phase on one terminal of the motor or other causes. This paper will analyze the operation of a 3-phase induction motor under normal balanced source voltages first, then under single phasing experimentally in order to follow a comparative approach.

scholarly journals Improvement of the Thermal and Mechanical Strength of the Starting Cage of Double-Cage Induction Motors

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4551 ◽  
Author(s):  
Jan Mróz ◽  
Wojciech Poprawski
Keyword(s):  
Mechanical Strength ◽  
Induction Motor ◽  
Thermal Stresses ◽  
Induction Motors ◽  
Cooling System ◽  
Design Solution ◽  
Start Up ◽  
Cause Of Failure ◽  
Cage Induction Motor ◽  
Start Ups

This article discusses the thermal and mechanical exposure of the starting cage of a double-cage induction motor rotor during start-up. Damage to the starting cage is the most common cause of failure of a double-cage winding during long start-ups. It has been indicated that the end region of the double-cage winding is a key area in the search for a more damage-resistant solution. Among the available studies on improving the mechanical strength of double-cage windings, which typically focuses on improving the cooling system, modifying the shape of the slots, or altering the bar material, a new concept of improving the mechanical strength through the modification of the structure of the end region has appeared. This is achieved by applying sleeves onto the ends of the starting cage bars, which helps to reduce the temperature of the connection between the starting bars and the end rings. A simulation of the temperature field of a double-cage induction motor with this new design is performed and discussed in this paper. It has been confirmed that the new design solution effectively improves the mechanical strength of the starting cage, making it less prone to damage caused by thermal stresses.

Energy Conservation through Multi Winding Induction Machines

2012 ◽  
Vol 433-440 ◽  
pp. 7165-7169
Author(s):  
V Chandrasekaran ◽  
T Manigandan
Keyword(s):  
Energy Conservation ◽  
Induction Motor ◽  
Power Factor ◽  
Induction Motors ◽  
Mechanical Load ◽  
Induction Machines ◽  
Maximum Efficiency ◽  
Small Contribution ◽  
Synchronous Reluctance Motor ◽  
Three Phase

Three phase induction motors are employed in Textile mills, Agriculture and in almost all the machine tools. More than 60% of electrical energy generated being consumed by the induction motors. Hence, even a small contribution in the improvement of the power factor and efficiency will be cost effective. The power factor and efficiency of an induction motor is based on the shaft load and in order to improve the same, multi windings are suggested in the same stator. In multi winding induction machines, when one set of windings is connected to a three phase a supply, a revolving magnetic field of constant magnitude is developed in the air gap which is responsible to work as a conventional induction motor to meet the mechanical load and to develop a three phase EMF in the other winding that works as an Induction Alternator (IA).Double Winding Induction Motor (DWIM) also provides an opportunity to load each winding individually to its rated capacity. A small three phase load or a single phase load may be connected to the second set of winding. The dependency of separate supply for this load is eliminated. Hence, improvement in the efficiency, power factor and energy conservation is made possible in these machines. In order to validate the problem statement, a 3-phase, 3.0 kW, 415 V Double Winding Induction Motor(DWIM), a 3-phase, 3.0 kW, 415 V Double Winding Synchronous Reluctance Motor (DWSyRM), a 3-phase, 2.2 kW, 415 V Three Winding Induction Motor (TWIM) have been designed, fabricated and tested. Two controllers have been designed, one for a DWIM to operate the motor in power balancing and maximum efficiency modes of operation and other to operate TWIM at three different voltage levels depending upon the shaft load. In this paper, detailed comparisons of performances of three multi winding machines are presented.

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