Closed-Form Solution for the Slot Leakage Inductance of Tooth-Coil-Winding Permanent Magnet Machines

Madariaga, Carlos; Jara, Werner; Tapia, Juan A.; Pyrhönen, Juha; Lindh, Pia; Riedemann, Javier

doi:10.1109/tec.2019.2908053

Cited by 14 publications

(14 citation statements)

References 25 publications

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“…as in [24]. From (12) and the geometry definitions in Figure 6, it is shown theoretically that L sl , and therefore L s , can be increased by closing the stator slots and using a rectangular slot shape (λ uv is inversely proportional to b s and b o ).…”

Section: Stator Designmentioning

confidence: 99%

“…where m is the number of phases, W is the number of turns in series per phase, k w is the winding factor of the generator's working harmonic, d i is the air gap diameter, l Fe is the axial stack length, g air is the resultant air gap length taking Carter's factor into account, and K s is the saturation factor. The slot-leakage inductance can be calculated as in [24,25], using:…”

Section: Stator Designmentioning

confidence: 99%

See 1 more Smart Citation

On the Design and Topology Selection of Permanent Magnet Synchronous Generators for Natural Impedance Matching in Small-Scale Uncontrolled Passive Wind Generator Systems

Labuschagne

Kamper

2022

Energies

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Small-scale uncontrolled passive wind generator systems are an attractive solution for rural energy generation because of the system’s reliability and low cost. However, designing these uncontrolled wind generators for good power matching with the wind turbine is challenging and often requires external impedance matching. In this paper, permanent magnet generators with different stator and rotor structures were investigated and designed to increase the generator’s synchronous inductance for a natural impedance matching. For the design methodology, multi-objective optimisation was used to design the generators for near-maximum turbine power matching, whereby internal impedance matching was reached as much as possible. It was shown that altering the placement and orientation of the permanent magnets in the rotor is a viable method to achieve the desired impedance matching; however, these generators do not have the best performance. It was found that the surface-mounted permanent magnet generator with semi-closed slots was the optimum topology. An optimised generator prototype was tested for the experimental validation. All designs were verified by comparing the results of 2D and 3D finite-element analysis.

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Section: Stator Designmentioning

confidence: 99%

Section: Stator Designmentioning

confidence: 99%

On the Design and Topology Selection of Permanent Magnet Synchronous Generators for Natural Impedance Matching in Small-Scale Uncontrolled Passive Wind Generator Systems

Labuschagne

Kamper

2022

Energies

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“…The design optimization process aims to achieve the multiobjective function in (26) by varying the dimensions of the NO-PMSG and uses the proposed static FEA method to calculate the performance and to ensure maximum power matching. In this way, the cost of the generator is effectively minimized for the correct L ext .…”

Section: A 42 Kw No-pmsg (G3)mentioning

confidence: 99%

“…as in [26]. Here, λ uv is the slot permeance factor given in [26] for a double-layer non-overlapping winding with a vertical arrangement of coil sides, or as given in [21] for overlapping windings, and Q s is the number of slots.…”

Section: Appendix A: Analytical Inductance Calculationsmentioning

confidence: 99%

Wind Generator Impedance Matching in Small-Scale Passive Wind Energy Systems

Labuschagne

Kamper

2021

IEEE Access

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In this paper, the improved turbine power matching of passive wind energy systems for dcconnected battery storage applications with an impedance matching method is investigated. The passive system uses a direct-drive permanent magnet synchronous generator and is directly connected via a diode rectifier to the dc fixed-voltage battery storage. To improve power matching, an external inductance is added to the passive system between the generator and the diode rectifier. A static finite element based solution method is proposed to accurately calculate the necessary external inductance to achieve near maximum power point matching. It is shown that the proposed finite element based calculation method is computationally efficient and excellently suited for generator design optimization, which is critical for this application. It is also shown that by rewinding existing machines for the correct cut-in speed and adding the external inductance for improved power matching, existing machines can be effectively recycled for passive wind energy systems. The proposed static finite element solution method's accuracy and improved power matching are confirmed with measured results on a sub 5 kW power level.

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“…For the slot opening and slot wedge area, the ratio λ p (k) /λ f is derived by the calculation of the self-and mutual component of the inductance described in [30] as:…”

Section: Slot Leakage Inductancementioning

confidence: 99%

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

2021

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The usage of multiphase electrical drives expands the operation possibilities of electrical machines and opens new directions of research on inverter-fed electrical machines. With an increasing number of phases, the standard approach of the electromagnetic design of machines has to be generalized to m-phase systems, which is not usually respected in the literature focused on electric machine design, and it is rarely published. This paper summarizes the specific problems linked with the design of machines with different numbers of phases, focusing on the winding design and the calculation of equivalent circuit parameters. In addition to the direct effect of different numbers of phases, the impact of injecting higher order time harmonic components on the electromagnetic design of electric machines is analyzed. The obtained analytical results are verified by the measurement of a nine-phase experimental induction motor.

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Closed-Form Solution for the Slot Leakage Inductance of Tooth-Coil-Winding Permanent Magnet Machines

Cited by 14 publications

References 25 publications

On the Design and Topology Selection of Permanent Magnet Synchronous Generators for Natural Impedance Matching in Small-Scale Uncontrolled Passive Wind Generator Systems

On the Design and Topology Selection of Permanent Magnet Synchronous Generators for Natural Impedance Matching in Small-Scale Uncontrolled Passive Wind Generator Systems

Wind Generator Impedance Matching in Small-Scale Passive Wind Energy Systems

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

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