Formulation of Stray Loss in Medium Power Inverter-fed Induction Motors

10.36227/techrxiv.14680128 ◽

2021 ◽

Author(s):

Rajendra Kumar ◽

Bikash Sah ◽

Praveen Kumar

Keyword(s):

Test Data ◽

Induction Motors ◽

Normal Operation ◽

Design Stage ◽

Switching Frequency ◽

Loading Test ◽

Proposed Model ◽

Three Phase ◽

Operating Points ◽

Prediction Capability

<div>The work presents a fast and accurate empirical stray loss model for inverter fed three-phase induction motors (IMs). The model is intended to quantify the SL both at the design stage and, normal operation of the IM. The development of the model considers the variations of frequency, switching frequency and motor’s loading. Test data of 128 operating points of two training IMs are used to develop the model. The accuracy and prediction capability of the proposed model is presented with the measured SL values for 128 operating points of another set of two IMs of the same specifications and different geometries.</div>

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Improvement in Performance of Short Chorded Three-Phase Induction Motors with Variable in PWM Switching Frequency

INTERMAG 2006 - IEEE International Magnetics Conference ◽

10.1109/intmag.2006.374997 ◽

2006 ◽

Author(s):

R. R. Deshmukh ◽

A. J. Moses ◽

F. J. Anayi

Keyword(s):

Induction Motors ◽

Switching Frequency ◽

Three Phase

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Analysis of Equivalent Inductance of Three-phase Induction Motors in the Switching Frequency Range

Electronics ◽

10.3390/electronics8020120 ◽

2019 ◽

Vol 8 (2) ◽

pp. 120 ◽

Cited By ~ 1

Author(s):

Milan Srndovic ◽

Rastko Fišer ◽

Gabriele Grandi

Keyword(s):

Induction Motors ◽

Harmonic Distortion ◽

Voltage Source ◽

Switching Frequency ◽

Frequency Range ◽

Leakage Inductance ◽

Squirrel Cage ◽

Three Phase ◽

Ripple Amplitude ◽

Current Ripple

The equivalent inductance of three-phase induction motors is experimentally investigated in this paper, with particular reference to the frequency range from 1 kHz to 20 kHz, typical for the switching frequency in inverter-fed electrical drives. The equivalent inductance is a basic parameter when determining the inverter-motor current distortion introduced by switching modulation, such as rms of current ripple, peak-to-peak current ripple amplitude, total harmonic distortion (THD), and synthesis of the optimal PWM strategy to minimize the THD itself. In case of squirrel-cage rotors, the experimental evidence shows that the equivalent inductance cannot be considered constant in the frequency range up to 20 kHz, and it considerably differs from the value measured at 50 Hz. This frequency-dependent behaviour can be justified mainly by the skin effect in rotor bars affecting the rotor leakage inductance in the considered frequency range. Experimental results are presented for a set of squirrel-cage induction motors with different rated power and one wound-rotor motor in order to emphasize the aforesaid phenomenon. The measurements were carried out by a three-phase sinusoidal generator with the maximum operating frequency of 5 kHz and a voltage source inverter operating in the six-step mode with the frequency up to 20 kHz.

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An accurate inter-turn short circuit faults model dedicated to induction motors

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v11i1.pp9-16 ◽

2021 ◽

Vol 11 (1) ◽

pp. 9

Author(s):

Fatima Babaa ◽

Ouafae Bennis

Keyword(s):

Induction Motors ◽

Model Simulation ◽

Short Circuit ◽

Induction Machine ◽

Industrial Systems ◽

Proposed Model ◽

Three Phase ◽

Fault Prognosis ◽

Short Circuits ◽

Short Circuit Fault

Safety, disponibility and continuity of industrial systems are major issue in maintenance. In the last decades, these points are the important axes in the field of research. In fact, in many industrial processes research has picked up a fervent place and a particular importance in the area of fault diagnosis of electrical machines, in fact, a fault prognosis has become almost indispensable. The need of a mathematical model of three-phase induction machine, suitable for the simulation of machines behaviour under fault conditions, has received considerable attention. The paper presents a new practical and more precise model for induction motors after introducing inter turn short circuits faults. The proposed model is based on coupled magnetic circuit theory, capable to take into account any electrical asymmetry conditions. To verify the exactitude and the effectiveness of the model, simulation results for induction machine under interturn short circuit fault are presented. In spite of its simplicity, the proposed model is able to provide useful indications for diagnostic purposes. Experimental study is presented at the end of the paper to show that the proposed model predicts the induction machine behavior with a good accuracy.

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E-Type Asymmetric Multilevel Inverter Based Transformer less Traction Drive

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.j9293.0881019 ◽

2019 ◽

Vol 8 (10) ◽

pp. 2579-2589

Keyword(s):

Output Voltage ◽

Induction Motors ◽

Multilevel Inverter ◽

Switching Frequency ◽

Switching Loss ◽

Traction Drive ◽

Power Semiconductor ◽

Electric Drives ◽

Semiconductor Switches ◽

Three Phase

To overcome the limitations of conventional multilevel inverter such as of more no. of power semiconductor switches, large no. of capacitors, more switching loss etc. , a new topology of Envelope type (E-type) MLI is used. This E-type Module has some preferable features like reduced no. of components and low switching frequency. This E-type asymmetric converter uses four unequal DC sources and ten switches to generate 13 level of output voltage. SHE modulation technique is used to achieve high quality output voltage with low harmonic content. This E-type converter configuration will be used in transformer less traction drive. Nowadays Induction motors are used as electric drives for most of the electric railways. A transformer less connection is used for feeding Induction motor. This converter-inverter configuration will convert single phase AC voltage to DC and again this DC voltage will be converted into three phase AC. The output of the E-type Multi level inverter will be used to drive the Induction motors.

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