Use of novel adaptive digital feedback for magnetic measurements under controlled magnetizing conditions

Żurek, S.; Marketos, P.; Meydan, Turgut; Moses, Anthony John

doi:10.1109/tmag.2005.854438

Cited by 82 publications

(45 citation statements)

References 8 publications

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“…This will be done by magnetizing the sample by six coils which are placed around the magnetizing yoke and applying suitable mechanical loadings to the six arms of the sample in pairs L0°, L60°, L120°. Excitation voltage of the coils can be controlled by using the procedure explained in [15]. The homogeneity of the magnetic field and the stress in the central region is tested under purely magnetic and mechanical loading numerically using FEM model of the device.…”

Section: A Novel Biaxial Single Sheet Tester Designmentioning

confidence: 99%

Coupled Magneto-Mechanical Analysis of Iron Sheets Under Biaxial Stress

et al. 2016

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A novel single sheet tester design is proposed and a directly coupled magneto-mechanical model is used to numerically analyze the behavior of iron sheets under biaxial magneto-mechanical loading applied by the tester device. Magneto-mechanically coupled constitutive equations of the material derived using an energy based approach are integrated into a finite element model of the single sheet tester device and simulations are performed to solve for the displacement field and the magnetic vector potential in the sample. The obtained numerical results of magnetostriction evolution due to uniaxial stress and stress induced anisotropies due to permeability variation under different magneto-mechanical loadings are presented. The simulation results are compared to the results published in the literature for the purpose of validation.

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Section: A Novel Biaxial Single Sheet Tester Designmentioning

confidence: 99%

Coupled Magneto-Mechanical Analysis of Iron Sheets Under Biaxial Stress

et al. 2016

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“…It takes approximately 20 s to reach the maximum point of the magnetization curve, which equals an equivalent full period frequency of 12.5 mHz. For AC tests the control algorithm from [7] has been adapted to the system for measuring complete BH hysteresis curves with a sinusoidal flux density at different flux density amplitudes. The LabVIEW system measures and stores the excitation current, the voltage over the measurement winding and the flux density determined by the fluxmeter.…”

Section: B Control Systemmentioning

confidence: 99%

Temperature Influence of NiFe Steel Laminations on the Characteristics of Small Slotless Permanent Magnet Machines

et al. 2013

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Abstract-High performance electrical machines can operate at temperatures of 100• C and beyond in rotor and stator cores. However, magnetic properties are generally measured at room temperatures around 23• C to 25• C according to the standards, even if it is known that the magnetization of some materials is substantially influenced by increasing temperatures. This paper investigates the thermal influence on the magnetic properties and iron losses in the stator cores of small slot-less permanent magnet synchronous machines (PMSMs). The stator stack is made of thin nickel iron (NiFe) lamination sheets. Magnetic measurements of the stator core are conducted for different frequencies and flux densities at several temperatures between 25• C and 105• C. The obtained measurement data is afterwards used in finite element method (FEM) simulations to investigate the influence of the magnetic property change on the machine performance. For the PMSM in consideration, the FEM simulations show that an increased stator core temperature reduces the electromagnetic torque considerably; approximately 1/3 of the torque reduction due to increased rotor magnet and stator core temperatures (from 25• C to 100 • C) can be attributed to the increased stator core temperature.

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“…This significantly increases the resolution of the adjusted output signal V gen ; in addition, the amplitude adjustment algorithm seems to converge better with higher active resistance of the magnetization circuit. The problem could be also solved by using more sophisticated and time-consuming feedback algorithms, eg an algorithm with the simultaneous corrections of V gen amplitude and phase [8,14]. Before the final measurement with the fitted V gen (t) signal, the demagnetization to the obtained geomagnetic offset V of f can be performed.…”

Section: Setup Descriptionmentioning

confidence: 99%

Three–Parameter Feedback Control of Amorphous Ribbon Magnetization

Stupakov¹,

Švec²

2013

Journal of Electrical Engineering

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This work describes a specially developed software for controllable magnetic hysteresis measurements of amorphous and nanocrystalline ribbons. The sophisticated algorithm enables to simplify a hardware design and to suppress an influence of experimental conditions on the measurement results. The main software feature is a three-stage feedback algorithm, which accurately adjusts the magnetization conditions: magnetization amplitude, geomagnetic bias and magnetization waveform. Air flux compensation of the induction signal is also performed by the software using an effective value of the coil cross section obtained from a calibration measurement without the ribbon. Applicability of the designed setup is illustrated for a series of nanocrystalline Hitperm ribbons measured at the power-line conditions: 50 Hz frequency and sinusoidal magnetization waveform.

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Use of novel adaptive digital feedback for magnetic measurements under controlled magnetizing conditions

Cited by 82 publications

References 8 publications

Coupled Magneto-Mechanical Analysis of Iron Sheets Under Biaxial Stress

Coupled Magneto-Mechanical Analysis of Iron Sheets Under Biaxial Stress

Temperature Influence of NiFe Steel Laminations on the Characteristics of Small Slotless Permanent Magnet Machines

Three–Parameter Feedback Control of Amorphous Ribbon Magnetization

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