Iron Loss Prediction Using Modified IEM-Formula during the Field Weakening for Permanent Magnet Synchronous Machines

Asef, Pedram; Bargallo, Ramon; Lapthorn, Andrew

doi:10.3390/machines5040030

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…k p and a p are for representing the effect of punching on iron losses. The term (1 + x 10 B x20 ) in ( 3) is for considering the increase of eddy-current loss due to saturation [24]. It is assumed that cutting does not affect eddy current losses.…”

Section: Punching Modelmentioning

confidence: 99%

Manufacturing-Induced Cogging Torque in Segmented Stator Permanent-Magnet Machines With Respect to Steel Punching

et al. 2022

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There are applications like electric power-assisted steering system in which strict requirements on the cogging torque of the machine should be fulfilled. Numerous techniques and methods are introduced in order to minimize the inherent cogging torque of the machine, but manufacturing tolerances and imperfections still can cause extra cogging torque. In this paper, the impact of punching on the manufacturing-induced cogging torque of segmented permanent-magnet synchronous machines is investigated. The punching model is implemented by modifying the BH curve of the steel as a function of distance from the cut edges. The parameters of the new BH curve are identified by means of standard Epstein frame measurements using steel strips with different widths. Then, the punching model is incorporated into the finite element model of a 10-pole 12-tooth segmented stator machine designed for power steering application. It is observed that deviation among the magnetic properties of the teeth caused by punching can introduce extra low-order harmonics in the cogging torque of the machine. The amplitude of the new orders can be comparable or even much bigger than the inherent orders, where not only the magnitude of deviation but also the arrangement of teeth with given punching parameters play a role.

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Section: Punching Modelmentioning

confidence: 99%

Manufacturing-Induced Cogging Torque in Segmented Stator Permanent-Magnet Machines With Respect to Steel Punching

et al. 2022

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“…P eddy is calculated as: n is the harmonic number of flux density waveform and α eddy the eddy current loss coefficients. The term (1+α 1 B α2 n,l ) is for considering the increased EC losses due to the saturation [16]. P exc is calculated as:…”

Section: B Fault-tolerant Control Strategymentioning

confidence: 99%

Iron Losses of Dual-Star PMSMs with Open-Circuit Fault under Fault-Tolerant Control

Mohammadi

Pop

Gyselinck

2021

2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

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In this paper the iron losses of dual-star permanentmagnet synchronous machines under fault-tolerant control with phase open-circuit fault are investigated. Various faults including one or two open-circuits in different phases are considered. The iron loss terms, namely hysteresis, eddy-current, anomalous, and rotational losses, considering harmonics are calculated based on a priori knowledge of magnetic field distribution obtained by magnetostatic FE simulations. A variety of motor topologies including laminated-core surface-mounted or interior permanent magnet with distributed or concentrated winding are studied. As far as the core losses are concerned, it is observed that the machines are ill-conditioned under the post-fault control, i.e. the iron losses considerably increase, particularly at high speeds. Moreover, in contrast to the healthy case, the iron losses will not be distributed evenly among the stator teeth which leads to concentration of loss in some segments of the core.

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Effect of Electrical Steel Punching on the Performance of Fractional-kW Electrical Machines

Mohammadi¹,

Zhang

Pop

et al. 2022

IEEE Trans. Energy Convers.

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The effect of magnetic steel degradation due to punching on the performance of fractional-kW electrical machines in terms of torque and iron losses is investigated. In order to model the punching effect, the BH curve of the steel is represented as a function of the distance from the cut edge in addition to field intensity. Similarly, the iron losses formula is expressed as a position-dependent function. The modified model for BH curve and iron losses are identified by fitting the proposed relations with measured values obtained via standard Epstein frame test as an inverse optimization problem. The new BH curve expression is incorporated into magnetostatic FE equations. Then, the performance of two different synchronous machines, i.e. with permanent-magnet or reluctance rotor, are analyzed using FE simulations. It is observed that flux density distribution in magnetic core will be considerably distorted particularly in regions which are not heavily saturated. In terms of global quantities, the average torque decrease by 0.5-2 percent, while iron losses can undergo an increase of 50-70 percent.

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Iron Loss Prediction Using Modified IEM-Formula during the Field Weakening for Permanent Magnet Synchronous Machines

Cited by 5 publications

References 28 publications

Manufacturing-Induced Cogging Torque in Segmented Stator Permanent-Magnet Machines With Respect to Steel Punching

Manufacturing-Induced Cogging Torque in Segmented Stator Permanent-Magnet Machines With Respect to Steel Punching

Iron Losses of Dual-Star PMSMs with Open-Circuit Fault under Fault-Tolerant Control

Effect of Electrical Steel Punching on the Performance of Fractional-kW Electrical Machines

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