A laboratory system to produce a highly accurate and uniform magnetic field for sensor calibration

Mirzaeva, Galina; Summers, T. J.; Betz, R.E.

doi:10.1109/icit.2012.6210073

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…Our proposed fault index based on the 2nd, 4th and 6th harmonics (given by (17)) is calculated to be 0 and 0.0555 in both cases respcetively.…”

Section: B Simulation Results Of the Mixed Eccentricity Faultmentioning

confidence: 99%

“…Two sensors are machined in every slot of the stator, one at the front and the other at the rear, yielding a total of 72 HEFS sensors. G. Mirzaeva et al proposed a method to calibrate a flux sensor with high accuracy [17]. With the proposed calibration system, the air gap flux density of 100 mT to over 1 T can be measured with accuracy ±3%, potentially up to ±1%.…”

Section: Methodsmentioning

confidence: 99%

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Fault diagnosis of induction motors by space harmonics analysis of the main air gap flux

Saad

Mirzaeva

2014

2014 International Conference on Electrical Machines (ICEM)

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A new fault diagnosis scheme based on the monitoring of main air gap flux of the three phase squirrel cage induction motor is proposed. Most of the existing electrical techniques of condition monitoring are based on the stator current and/or leakage flux measurement outside the motor. Besides, most of these methods only concentrate on the time harmonics analysis of the acquired signal. We propose to analyse the space harmonics of the main air gap electromagnetic flux along with the time domain analysis. To this aim, we propose to monitor the main air gap flux using Hall Effect Flux Sensors (HEFS) at all the stator slots of an induction motor, which can be used to address the stator and rotor slot effects not only through frequency analysis of the time varying magnetic flux, but also by magnitude and phase shift comparison of sensors located at different geometric positions around the stator. Moreover, by using HEFS in all the stator slots, the flux density along the circumference of the stator can be acquired and the space harmonics of the flux can be analysed, which shown promising results in detecting and locating different faults. In this paper, we concentrate on detecting different types of rotor faults such as broken rotor bar fault and eccentricity.

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“…Our proposed fault index based on the 2nd, 4th and 6th harmonics (given by (17)) is calculated to be 0 and 0.0555 in both cases respcetively.…”

Section: B Simulation Results Of the Mixed Eccentricity Faultmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fault diagnosis of induction motors by space harmonics analysis of the main air gap flux

Saad

Mirzaeva

2014

2014 International Conference on Electrical Machines (ICEM)

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“…Two identical axial coils with radius R and separated by the distance equal to its radius will produce a uniform magnetic field between the two coils [14]. When the flowing current of two coils is in the same direction, this coil configuration is called a Helmholtz coil.…”

Section: P a P E Rmentioning

confidence: 99%

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Taspika¹,

Nuraeni²,

Suhendra³

et al. 2018

Phys. Educ.

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This paper reports on the measurement of a magnetic field due to the coil carrying current by using the magnetic sensor in a smartphone as an alternate to the relatively expensive magnetic sensor probe. The location of the magnetic sensor in the smartphone was known by mapping the value of the magnetic field due to the permanent magnetic bar so that we could obtain an accurate measurement. The variable parameter examined in this magnetostatics experiment was the distance of coils to the magnetic sensor in a smartphone and the magnitude of the current in the coils. The coils used in this research have 8 cm radii and 30 turns of wire, with a 0.3 A current flowing, and the coils were arranged to make a Helmholtz and anti-Helmholtz configuration. The resulting magnetic fields by a coil, Helmholtz coil and anti-Helmholtz coil were measured and compared with the value from calculations using an analytical and numerical approach. According to these results, it can be confirmed that the magnetic field due to a Helmholtz and anti-Helmholtz coil can be measured accurately using the smartphone's magnetic sensor in a physics experiment.

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“…Variation of magnetic field when vehicle is parked can be very small and have unpredictable sign; 7. Magnetic field sensors LSM303DLH have a large scale of scattered parameters -sensitivity about 50 %, the initial displacement (offset) up to 20 %, temperature coefficient of sensitivity ranges from -5 % °C to +2 %/ °C [6], [7]; 8. Vehicle may be parked at any parking space in a parking lot; 9.…”

Section: Complex Vehicle Detection Criteriamentioning

confidence: 99%

Vehicle Influence on the Earth’s Magnetic Field Changes

Markevičius

Navikas²,

Daubaras³

et al. 2014

ElAEE

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Anisotropic magneto-resistive sensors (hereinafter -AMR) react to the Earth's and vehicles' magnetic field, whereas variation disturbances of magnetic field allow detecting the vehicles in the parking space. Having known exactly how the magnetic field varies in the parking space and having measured it with sensor LSM303DLH AMR, an assumption can be made about the presence or absence of a vehicle in the parking space. The article covers analysis of a vehicle's influence on the Earth's magnetic field and possibilities to detect the vehicle. The car constructional model has been mathematically described. The experiment has been performed and compared with the theoretical considerations. Three static detection criteria of the vehicle have been formulated.

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A laboratory system to produce a highly accurate and uniform magnetic field for sensor calibration

Cited by 16 publications

References 9 publications

Fault diagnosis of induction motors by space harmonics analysis of the main air gap flux

Fault diagnosis of induction motors by space harmonics analysis of the main air gap flux

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Vehicle Influence on the Earth’s Magnetic Field Changes

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