The temperature impact of magnetic wedges on TEFC induction motors

Gaerke, Tyler R.; Hernandez, David C.

doi:10.1109/ppic.2012.6293010

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Hence they are more brittle due to the high percentage of iron powder. In addition, for reciprocating-type loads, the magnetic wedges are subject to cyclic mechanical forces and fretting can occur, and the movement will slowly increase until wedge failure occurs [15,16].…”

Section: Methodsmentioning

confidence: 99%

Influence of slot wedge material on permanent magnet losses in a traction motor with tooth coil windings

Lindh

Vaimann

Kallaste

et al. 2013

JAE

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Permanent magnet (PM) machines with tooth coil windings are designed and analyzed. We study how the slot wedge material affects the behavior of PM losses when using tooth coil windings, which generate a significant air gap flux density harmonic content. The losses and cogging torques of a surface permanent magnet rotor and an interior permanent magnet rotor are compared in no-load and load situations. A finite element analysis applying Cedrat's Flux2D is made. Motors of this size can have high permanent magnet eddy current losses, and therefore, segmented magnets are often preferred even though interior magnets and semi-magnetic wedge material are used. The study shows that tooth coil windings may benefit from using semi magnetic material as a wedge material as it decreases the stator iron losses and, especially, losses in the permanent magnets.

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Section: Methodsmentioning

confidence: 99%

Influence of slot wedge material on permanent magnet losses in a traction motor with tooth coil windings

Lindh

Vaimann

Kallaste

et al. 2013

JAE

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“…On the other hand, the torque ripple is reduced. Furthermore, the efficiency, vibration, and noise characteristics are improved . Usually, the capacity of line‐start high‐voltage permanent magnet synchronous motor (LS‐HV‐PMSM) is higher, and the harmonics influence will be more obvious.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic slot wedge on the performance of 10‐kV, 1000‐kW permanent magnet synchronous motor

Qiu

Liu

et al. 2020

Int Trans Electr Energ Syst

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Summary Because of uneven air‐gap magnetic field caused by open slots in stator cores, motor performance is influenced by harmonic magnetic field in air‐gap. In this paper, a 10‐kV, 1000‐kW line‐start high‐voltage permanent magnet synchronous motor (LS‐HV‐PMSM) is taken as an example to establish finite element models when the magnetic slot wedge relative permeability is different. The influence of using the magnetic slot wedge on a motor's torque ripple, loss, and starting performance is studied. On the basis of the analysis of the torque ripple coefficient, the influence of the magnetic slot wedge relative permeability on torque ripple is obtained. Using the finite element method, the influence of the magnetic slot wedge relative permeability on a motor's loss is studied. It is found that the rotor cage bar eddy‐current loss is changed obviously. The relationship between the rotor cage bar eddy‐current loss and rotor cage bar current density is determined. Furthermore, the influence mechanism of rotor cage bar current density on rotor cage bar eddy‐current loss is revealed. According to the speed change curve, the starting performance of the LS‐HV‐PMSM is analyzed, and the influence of slot leakage reactance on a motor's starting performance is obtained. On the basis of the above analysis, some references are obtained for choosing the magnetic slot wedge with suitable relative permeability when the LS‐HV‐PMSM is designed.

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“…The use of magnetic wedges in order to improve the IM energy efficiency is a real possibility [9], even more if the new class of efficiency is taken into account. Furthermore, magnetic wedges avoid high concentrations of flux density in the stator teeth reducing localized magnetic losses and the temperature rise inside the machine [10]. During the motor startup or load variation, the magnetic wedges are subject to cyclic stresses which can affect clamping conditions within the slots [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Fault detection in magnetic wedges of induction motor

Bossio¹,

Barrera²,

Bossio³

et al. 2015

2015 IEEE 24th International Symposium on Industrial Electronics (ISIE)

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In high power electric motors it is common to use open slots to facilitate the assembly of the coils. Open slots introduce harmonics in the magnetomotive force distribution over the air gap, resulting in additional losses and parasitic torques. In order to reduce these effects, wedges of magnetic material are used. These wedges are prone to apartial or total detachment, which in turn may result in other failures. In this paper a strategy to detect faults in magnetic wedges is presented. This strategy consists of the injection of a zero sequence voltage signal of high frequency. The resulting currents are highly dependent on the magnetic irregularities both the rotor and stator and thus sensitive to asymmetries produced by faults in the wedges. In this way, it is possible to detect and quantify wedges faults without the need to disassemble or remove the IM from the production line. The proposed strategy is applicable offline and required only disconnect the motor of the power supply. Laboratory experimental results are presented to validate the proposal.

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The temperature impact of magnetic wedges on TEFC induction motors

Cited by 8 publications

References 11 publications

Influence of slot wedge material on permanent magnet losses in a traction motor with tooth coil windings

Influence of slot wedge material on permanent magnet losses in a traction motor with tooth coil windings

Influence of magnetic slot wedge on the performance of 10‐kV, 1000‐kW permanent magnet synchronous motor

Fault detection in magnetic wedges of induction motor

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