Saturation Factors for Leakage Reactance or Induction Motors

Agarwal, Paul D.; Alger, P. L.

doi:10.1109/aieepas.1960.4500907

Cited by 18 publications

(3 citation statements)

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“…Knowledge of the leakage inductances of electrical machines is a decisive factor for calculating their operating performance, with starting torque and current, power factor and behavior at short circuit strongly depending on it in particular [3] [4]. There are six principal leakage paths in induction machines, with stator and rotor leakage as well as differential leakage (zigzag and belt leakage) depending on the geometric cross section and the magnetic characteristics of the active iron part of the machine, while the remaining two (end-winding leakage and skew leakage) are determined by the bar skew along the z-axis and the geometry of the winding parts (stator) and the short-circuit ring (rotor) outside the core region [1] [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of Magnetic Saturation in Induction Machines During Transients

Conradi¹,

Schmülling²,

Schmülling³

2013

JET

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Magnetic saturation in electrical machines is of major influence on the operating characteristics during transients. For induction machines, the assumption of linear magnetic behavior of the iron core in classical machine models may be adequate for the calculation of steady-state rated operation. In operating points or during transients following a short-circuit or out-of-phase synchronization, where currents can reach values as high as 25 pu, especially the magnetic paths of the leakage fluxes are highly saturated, leading to a significant raise in currents and machine torque. Therefore an investigation on the effect of magnetic saturation has been performed by comparing inductances calculated by analytical methods for assumed linear magnetic behavior with results of static finite-element-method (FEM) models taking magnetic saturation into account. These results are subsequently converted into simplified current-depending parameter functions that can be used in transient machine models. Therefore, based on an enhanced space phasor approach, a newly modified machine model is presented, where the parameters can be used according to the dependencies worked out in the paper in order to identify deviations with the classical approach using constant inductances. Furthermore the newly acquired set of current-depending machine inductances is validated by simulating a series of transients using dynamic FEM calculation, showing a significant improvement in accuracy compared to sets of constant parameters.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of Magnetic Saturation in Induction Machines During Transients

Conradi¹,

Schmülling²,

Schmülling³

2013

JET

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“…11. In the above determination, the fundamental EMF EGr is assumed to be equivalent to the fundamental EMF Er in (2). However, this is not the case when the EMF due to `Fet is included.…”

Section: Experimentationmentioning

confidence: 99%

Experimental Study of Stator Leakage Reactance in Small Induction Motors

et al. 1997

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“…P.D. Agarwal calculated the leakage reactance of induction motors by equivalent circuit, and saturation factors were considered with respect to different angles between the air-gap surface and the slope of the tooth overhang [1]. S.A. Swann analyzed the current distribution over the cross section of a solid cylindrical conductor in a slot with a narrow opening, and determined the complex impedance of the conductor [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Slot Leakage Reactance of Submersible Motor with Closed Slots during Starting Transient Operation

Bao¹,

Di²,

Fang³

2016

Journal of Electrical Engineering and Technology

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-Generally, closed slots are adopted to reduce the water friction loss in both the stator and the rotor of water filling submersible motor due to the special environment of operation. One of the obvious differences between the traditional induction motors and water filling submersible motors is that the submersible motors only need relatively smaller starting torque. This paper aims to analyze the slot leakage reactance of water filling submersible motor during starting transient operation. An improved analytical method which considered the magnetic saturation of the slot bridge and the skin effect of rotor bars is proposed. The slot permeance factor which has a direct impact on the slot leakage reactance is calculated. Then finite element models with different stator slot types are constructed and search coils are introduced to measure the slot flux linkage. Moreover, the starting performances of the models with two typical stator slots are compared and the flux leakage characteristics are obtained. Finally, the results obtained by finite element method are very close to the results obtained by analytical method.

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Saturation Factors for Leakage Reactance or Induction Motors

Cited by 18 publications

References 0 publications

Investigation on the Effects of Magnetic Saturation in Induction Machines During Transients

Investigation on the Effects of Magnetic Saturation in Induction Machines During Transients

Experimental Study of Stator Leakage Reactance in Small Induction Motors

Analysis of Slot Leakage Reactance of Submersible Motor with Closed Slots during Starting Transient Operation

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