A new analytical method for the computation of air-gap reactances in 3-phase induction motors

Ionel, Dan M.; Cistelecan, Mihai V.; Miller, Tim; McGilp, M.I.

doi:10.1109/ias.1998.732260

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…From a practical point of view it has the advantage of using a common magnetic circuit analysis for both the polyphase and split-phase machines. The split-phase motor analysis is improved as a result of the greater precision in the polyphase electromagnetic model, particularly in relation to the calculation of the air-gap flux-density waveform including saturation harmonics, [6].…”

Section: Discussionmentioning

confidence: 99%

“…Their computation is simpler in the polyphase motor because the flux is essentially constant and rotates at synchronous speed, whereas in the split-phase motor it varies cyclically and is visualized as having forward and backward revolving components. Since the flux variation in split-phase motors is "elliptical" it can be treated with reference to a variable-voltage calculation in the equivalent polyphase motor [6]. This is the basis for the method described in the paper.…”

Section: Introductionmentioning

confidence: 99%

“…Superimposed on the main flux is a set of harmonic variations caused by the effects of saturation, slotting, and skew [7]. These variations are themselves accompanied by induced rotor currents which do not participate in torque production but contribute significantly to the stray loss, and any method for estimating the stray loss must be built on a sound analysis of the main flux as described in the paper [6].…”

Section: Introductionmentioning

confidence: 99%

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Revolving-field polygon technique for performance prediction of single-phase induction motors

Rasmussen

Miller

2003

IEEE Trans. on Ind. Applicat.

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Abstract-This paper presents a new analytical technique for improving the performance prediction of single-phase induction motors, especially capacitor motors. The technique uses the split-phase motor electrical equivalent circuit analysis together with electrical and magnetic parameters whose variation is computed from the equivalent balanced polyphase motor, so that the same magnetic circuit analysis can be used for both. (The term split-phase is used to cover motors operating from a single-phase supply but with the phase windings split into two orthogonal windings, one of which may have a capacitor in series with it during running or starting.) The technique accounts for the elliptical envelope of the magnetizing field vector and results in improved precision, since the three-phase electromagnetic model is considered to be more precise than the normal split-phase motor analysis. An important result is the computation of vector polygons of flux density for each section of the magnetic circuit, providing a better basis for core loss prediction. The double-frequency torque ripple is also obtained from the stator magnetomotive force and flux-density polygons. Three different electrical equivalent circuit methods for the split-phase motor (based respectively on the cross-field theory, forward-and backward-revolving fields, and symmetrical components) are evaluated to determine the method best suited for incorporating the variation of the circuit parameters from the polyphase magnetic circuit analysis, and it is discussed how the core losses can be included in these circuits to obtain the best overall performance prediction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Revolving-field polygon technique for performance prediction of single-phase induction motors

Rasmussen

Miller

2003

IEEE Trans. on Ind. Applicat.

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“…This analysis is done either by analyzing the interaction of the flux linkage with the coils [11] or by considering the armature MMF harmonics [15,16,18,19]. The MMF harmonic method has the advantage of calculating the winding factor for all harmonics simultaneously while the flux linkage method can lead to a more intuitive understanding of underlying differences.…”

Section: Average Torque Analysismentioning

confidence: 99%

“…An alternate way of analyzing winding factors (k wν ) is through the direct analysis of the armature MMF distribution in the air-gap [19]:…”

Section: B Mmf Basedmentioning

confidence: 99%

Winding Factors and Magnetic Fields in Permanent-Magnet Brushless Machines With Concentrated Windings and Modular Stator Cores

Heins

Ionel

Thiele

2015

IEEE Trans. on Ind. Applicat.

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Removing some sections of the stator yoke in a permanent magnet brushless machine can be beneficial for reducing punching waste and simplifying motor manufacture. However in some cases, restricting the possible flux paths in this way will have a detrimental impact on the torque and air-gap harmonics. This paper discusses the potential implications of modular stator core arrangements and presents the air-gap flux density harmonics and winding factors for potential slot / pole combinations. FEA simulations are presented to support the analytical calculations. The analysis indicates that the performance reduction from using a modular stator is minimal when the number of slots and poles are similar but drops off substantially when this is not the case. A modular core stator will increase the MMF sub-harmonics due to the magnet field but can reduce the sub-harmonics due to the armature if a single layer winding is used. The effect of slotting is very similar for a modular and conventional core machine and FEA results match previously published analytical analyses.

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Winding factors and magnetic fields in permanent magnet brushless machines with concentrated windings and modular stator cores

Heins¹,

Ionel²,

Thiele

2013

2013 IEEE Energy Conversion Congress and Exposition

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A new analytical method for the computation of air-gap reactances in 3-phase induction motors

Cited by 10 publications

References 1 publication

Revolving-field polygon technique for performance prediction of single-phase induction motors

Revolving-field polygon technique for performance prediction of single-phase induction motors

Winding Factors and Magnetic Fields in Permanent-Magnet Brushless Machines With Concentrated Windings and Modular Stator Cores

Winding factors and magnetic fields in permanent magnet brushless machines with concentrated windings and modular stator cores

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