Electromagnetic Analysis of a Bridge Configured Winding Cage Induction Machine Using Finite Element Method

Konwar, Rajkumar Singha; Kalita, Karuna; Banerjee, Atanu; Khoo, W.K.S.

doi:10.2528/pierb12112205

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…His experimental findings have shown that using equalizing connections in the stator the UMP of an induction machine can be reduced by 25 times. The particular winding scheme has been called the bridge configured winding (BCW) scheme [52], and the currents flowing across this bridge are known as equalizing currents. It has shown the effect of equalizing currents (applied to the bridge) on the magnetic field coupled with rotor eccentricity.…”

Section: Reduction Of Umpmentioning

confidence: 99%

Monitoring and Damping UMP Due Eccentricity Fault in Induction Machines: A Review

Salah

Dorrel

Guo

2016

2016 International Conference of Asian Union of Magnetics Societies (ICAUMS)

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Three-phase induction machines are reliable and widely used in industrial plants. Efficient condition monitoring can diagnose the inception of fault mechanisms in induction motors thus avoiding failure and expensive repairs. Therefore, there is a strong need to develop a more efficient condition monitoring. The main target is to achieve a relatively low cost and/or non-invasive system which is still powerful in terms of monitoring for online detection of developing faults. In order to reduce the unbalanced magnetic pull (UMP) in case of an eccentric rotor, the eccentricity-generated additional airgap flux waves should be reduced. The present paper addresses rotor eccentricity faults and studies conventional monitoring techniques for induction motors. The radial forces in an induction motor are calculated. In addition, the characteristics of UMP in induction machines are stated.

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Section: Reduction Of Umpmentioning

confidence: 99%

Monitoring and Damping UMP Due Eccentricity Fault in Induction Machines: A Review

Salah

Dorrel

Guo

2016

2016 International Conference of Asian Union of Magnetics Societies (ICAUMS)

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“…This results in substantial cost savings for the inverter components and reduces inverter losses. Second, it is possible to passively provide corrective forces when the rotor is rotating eccentrically by simply short-circuiting the suspension terminals, a concept that has been explored in [17]. This is particularly useful in designs with mechanical bearings that require additional support when passing through critical speeds.…”

Section: Introductionmentioning

confidence: 98%

“…One group of these techniques can be differentiated by the fact that it provides separate suspension terminal connections which experience no motional-EMF when the rotor is centered [12]- [17], so-called "dual purpose no voltage" (DPNV) windings. DPNV windings have two key advantages over the other "dual purpose" approaches.…”

Section: Introductionmentioning

confidence: 99%

Dual-Purpose No-Voltage Winding Design for the Bearingless AC Homopolar and Consequent Pole Motors

Severson

Nilssen

Undeland

et al. 2015

IEEE Trans. on Ind. Applicat.

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A winding design approach is proposed for the bearingless ac homopolar and consequent pole motors that utilizes the same coils for both suspension force and torque production. This enables a "pure" bearingless motor design, where the same iron and copper are used for both magnetic bearing operation and torque production, and can result in more optimal machine performance. Separate terminal connections are provided for suspension and torque operation; the suspension terminals experience no motional-emf when the rotor is centered, thereby reducing the required voltage rating of the bearingless drive compared to other "dual purpose" winding designs. It is shown that only certain combinations of stator slots, phases, and poles yield suitable winding designs; most notably, the number of motor pole-pairs must be co-prime with the number of phases. A design procedure is proposed which allows the designer to simply modify end-connections of many conventional armature windings, including both integral-and fractional-slot windings; an example winding design is presented and analyzed using 3D finite element analysis (FEA); and a hardware prototype has been constructed with experimental results included to validate the proposed design approach.

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“…Torque, stator current and ohmic losses have been calculated for all the models and compared with each other. A time stepping finite element method has been used in [13] for the electromagnetic analysis of a bridge configured based Induction machine. It can be observed that the frequency component of UMP due to eccentricity has good agreements with the analytical and experimental results.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Bridge Currents of an Induction Machine Equipped with Bridge Conﬁgured Winding

Natesan

Kalita

Samala³

2015

IJECE

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<p class="CM1">An eccentric rotor motion imbalances the magnetic ﬁeld distribution in the air-gap region. Due to this uneven ﬂux density distribution, a net radial force called Unbalanced Magnetic Pull (UMP) is in action towards the shortest air-gap. This UMP can degrade the machine’s performance. UMP can be controlled by a special kind of winding called Bridge Conﬁgured Winding (BCW). The BCW winding is a single set of winding which is used to produce the torque as well as the controllable force. The main contribution of this paper is to inspect the ﬂow of bridge currents in the bridges when the machine is having rotor eccentricity or unbalance. The bridge currents in the presence of rotor eccentricity with the stator of an Induction machine model has been analyzed by using an Electromagnetic Finite Element (FE) solver called Opera 2D/RM solver (Rotation Motion Analysis). The bridge currents have been measured for two different cases., (i) Induction machine model with zero eccentricity, (ii) Induction machine model with 10% static eccentricity of the air gap. Experimental results are presented for the validation of Opera 2D/RM results. A modiﬁed 37kW Induction machine has been used for this study. A known mass unbalance is introduced in the perforated disc in order to create the unbalance in the system purposefully. The bridge currents have been measured and compared with and without unbalance present in the system. The comparison of measured bridge currents for all the cases are given in the frequency domain.</p>

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Electromagnetic Analysis of a Bridge Configured Winding Cage Induction Machine Using Finite Element Method

Cited by 11 publications

References 17 publications

Monitoring and Damping UMP Due Eccentricity Fault in Induction Machines: A Review

Monitoring and Damping UMP Due Eccentricity Fault in Induction Machines: A Review

Dual-Purpose No-Voltage Winding Design for the Bearingless AC Homopolar and Consequent Pole Motors

Numerical and Experimental Investigation of Bridge Currents of an Induction Machine Equipped with Bridge Conﬁgured Winding

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