Impulse Magnetization of Nd-Fe-B Sintered Magnets for Sensors

Przybylski, Marek; Kapelski, Dariusz; Ślusarek, B.; Wiak, Sławomir

doi:10.3390/s16040569

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…The stored energy in the capacitors must be sufficient to supply the permanent magnet with its magnetic energy and in addition capture the losses during transient magnetization process. In [6] and [7], this process is considered simulative, with no remanence taken into account, in contrast to [8] which also takes into account the remanent polarization of the permanent magnet during the magnetization process, allowing a more accurate calculation and description of local demagnetization effects.…”

Section: Magnetization Processmentioning

confidence: 99%

Archives of Electrical Engineering

Bavendiek,

Müller,

Sabirov

et al. 2019

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Accurate demagnetization modelling is mandatory for a reliable design of rareearth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements.

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Section: Magnetization Processmentioning

confidence: 99%

Archives of Electrical Engineering

Bavendiek,

Müller,

Sabirov

et al. 2019

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“…40 kOe [21] of Sm2Fe17 intermetallic compound. Proper magnetization might result in better magnetic values [22].…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Effect of heat treatment on the structure and magnetic properties of Sm-Fe alloys obtained by mechanical alloying

Razumov¹

2017

Adv. Mater. Lett.

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The effect of heat treatment on the structure and magnetic properties of Sm-Fe alloys obtained by mechanical alloying was investigated. The crystallization temperature of Sm2Fe17, an amorphous alloy obtained by mechanical alloying, was determined using differential scanning calorimetry. Based on these results, various samples were annealed at different isothermal holding temperatures, and those with the best magnetic properties were found. Experimental studies show that decreasing the isothermal holding temperature from 750 °C to 630 °C increases magnetic characteristics nearly four times. The saturation magnetization, romance and coercivity of the Sm2Fe17 powder were 121 emu/g, 28.5 emu/g and 800 Oe, respectively.

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Modeling of history‐dependent magnetization in the finite element method on the example of a postassembly rotor magnetizer

Bavendiek

Müller

Steentjes

et al. 2019

Int J Numerical Modelling

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Demagnetization characteristics of permanent magnets play a central role for the design and optimization process of permanent magnet electrical machines and magnetic actuators. Currently, practical issues, such as loss of performance of electromagnetic energy conversion devices, due to demagnetization effects in permanent magnets or due to reduced servo‐dynamics in magnetic actuators, cannot be addressed by using conventional material models or are investigated by using rough approximations valid in restricted operation regions, if at all. This paper strives to integrate demagnetizing characteristics dependent on previous magnetizing field strength in the finite element method. The discussed examples are a magnetizer of a single permanent magnet and a spoke‐type permanent magnet rotor.

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Impulse Magnetization of Nd-Fe-B Sintered Magnets for Sensors

Cited by 8 publications

References 15 publications

Archives of Electrical Engineering

Archives of Electrical Engineering

Effect of heat treatment on the structure and magnetic properties of Sm-Fe alloys obtained by mechanical alloying

Modeling of history‐dependent magnetization in the finite element method on the example of a postassembly rotor magnetizer

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