An improved iron loss estimation for permanent magnet brushless machines

Deng, Fang

doi:10.1109/60.815078

Cited by 85 publications

(7 citation statements)

References 10 publications

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“…A return of investment table is made taking into account the widely used and locally accessible core materials. It is based on estimated core losses via an analytical model [10], and investment costs of various electrical steel types. The results are presented in Table II according to amortization duration in months.…”

Section: Sariyar (1956)mentioning

confidence: 99%

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Winding Type Alternation of a Refurbished Old Generator

Tosun

Gülletutan

Yakut

et al. 2023

2023 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

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Refurbishment of hydro-generators promises an increased lifespan and improved efficiency. Old generators are not only less efficient but also less reliable; their fault occurrence is more common. The economic impact of out-service time can be astronomical. Thus, refurbishment is a critical task; but it is challenging too. Most of the conducted works focus on the material update, enhancing the cooling network, and obtaining better efficiencies. Modifying winding type, i.e. conversion from lap winding to wave winding is rare since it often requires a change in the slot number. Such a move can be laborious, size change can become mandatory. In this study, a refurbishment design strategy is proposed which includes a winding type conversion. The task is to implement a wave winding since it has less out-service time and is easily replaced by field workers. In this paper, an old generator that started operation in 1956 is used for a refurbishment. This study promises a guideline to hydro-generator designers who work on a refurbishment study on old hydro-generators that have diamond coils.

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Section: Sariyar (1956)mentioning

confidence: 99%

“…1) Core Loss: Core loss is calculated via the methodology presented in [10]. Formulas are developed to estimate the hysteresis and eddy current losses in the stator teeth and yoke.…”

Section: E Loss Distributionmentioning

confidence: 99%

Winding Type Alternation of a Refurbished Old Generator

Tosun

Gülletutan

Yakut

et al. 2023

2023 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

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“…Therefore, the magnetic flux variation due to the rotation of magnets generates eddy and hysteresis losses in laminations. These losses are estimated individually for stator teeth and yoke as the field variations in them are different [9]. The loss per unit mass due to hysteresis (P h ), eddy current in stator yoke (P ey ) and eddy current in stator tooth (P et ) are calculated as [9] (3) (4) (5) where f is the frequency of flux variation, B m is the peak flux density, α tt and β m are the tooth arc and the pole width respectively in electrical radians, K h , K e , α and β are the curve fit constants calculated from the loss data of the laminations.…”

Section: Losses In Pmbldc Motormentioning

confidence: 99%

Numerical and Experimental Investigation of Heat Flow in Permanent Magnet Brushless DC Hub Motor

Fasil

Plesner

Walther

et al. 2014

SAE Int. J. Alt. Power.

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This paper investigates the heat dissipation in the hub motor of an electric two-wheeler using lumped parameter (LP), finite element (FE) and computational fluid dynamic (CFD) models. The motor uses external rotor permanent magnet brushless DC topology and nearly all of its losses are generated in the stator. The hub motor construction restricts the available conductive paths for heat dissipation from the stator to the ambient only through the shaft. In contrast to an internal rotor structure, where the stator winding losses are diffused via conduction, here convection plays a major role in loss dissipation. Therefore, a LP thermal model with improved convection modelling has been proposed to calculate the temperature of the components inside the hub motor. The developed model is validated with the FE thermal model and the test data. In addition, CFD tools has been used to accurately model the internal and the external flow as well as the convective heat transfer of the hub motor. Finally, an optimization study of the hub motor has been carried out using the CFD model to improve heat transfer from the stator.

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“…The Bertotti three-term equation Eq. (3.3) [52] is a classic method to estimate the specific iron loss, P Spec [W/kg], in laminations with sinusoidal flux density variation. It describes P Spec by three terms that represents hysteresis losses, eddy current losses and excessive losses.…”

Section: Iron Lossesmentioning

confidence: 99%

“…(3.3) describes P Spec in terms of a sinusoidal variation in B, the accuracy will decrease when the B-waveforms deviates from a perfect sinusoid. In this case, [52] further presents the generalised equation, Eq. (3.4), that yields a more accurate result.…”

Section: Iron Lossesmentioning

confidence: 99%

Compact, Efficient and Flexible Drive Unit with Wide Operating Area for Conveyors

Nielsen

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An improved iron loss estimation for permanent magnet brushless machines

Cited by 85 publications

References 10 publications

Winding Type Alternation of a Refurbished Old Generator

Winding Type Alternation of a Refurbished Old Generator

Numerical and Experimental Investigation of Heat Flow in Permanent Magnet Brushless DC Hub Motor

Compact, Efficient and Flexible Drive Unit with Wide Operating Area for Conveyors

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