Inaccuracies of Giant Magneto-Resistive Angle Sensors Due to Assembly Tolerances

Ausserlechner, Udo

doi:10.1109/tmag.2009.2013712

Cited by 22 publications

(44 citation statements)

References 12 publications

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“…Therefore the accuracy of future systems will be dominated by assembly tolerances. In preceding works the author explained how assembly tolerances of giant magnetoresistive (GMR) sensors give rise to angle errors [8,9]. This paper derives analogous and even more general results for AMR sensors.…”

Section: Introductionsupporting

confidence: 52%

“…Advanced sensors may detect an entire revolution so that we keep 0 • ≤ ϕ < 360 • . This is compatible with [8,9]. With these transformations we can express x, y, z, n x , n y , n z in terms of the coordinates of the sensor die x (8) , y (8) , z (8) , n…”

Section: Assembly Tolerancesmentioning

confidence: 80%

“…n (8) x , n (8) y lie in the die surface and n (8) z is perpendicular to it. x (8) , y (8) describe the sensor layout, that is the locations of the infinitely small AMR-sensor elements on the die ‡ . The AMR sensors are on top of the die at z (8) = 0.…”

Section: Assembly Tolerancesmentioning

confidence: 99%

“…x (8) , y (8) describe the sensor layout, that is the locations of the infinitely small AMR-sensor elements on the die ‡ . The AMR sensors are on top of the die at z (8) = 0. The field components B (8) x , B (8) y , B (8) z in the layout coordinate system are functions of the coordinates in the die surface x (8) , y (8) and of all parameters of position tolerances in Table 1.…”

Section: Assembly Tolerancesmentioning

confidence: 99%

“…Finally, plots of angle error versus size of magnet are given and an optimized magnet geometry is disclosed. All definitions and symbols used are consistent with the preceding papers [8,9].…”

Section: Introductionmentioning

confidence: 97%

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Inaccuracies of Anisotropic Magneto-Resistance Angle Sensors Due to Assembly Tolerances

Ausserlechner¹

2012

PIER B

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Abstract-A large class of angle sensors uses a small permanent magnet attached to the rotor. The magnet is polarized perpendicularly to the axis of rotation, and a magnetic field sensor is placed ahead on the axis. The sensor circuit consists of two full bridges at 45 • , each having four anisotropic magneto-resistive (AMR) elements. Even though the electronic system may be calibrated to have nearly no errors like offset, nonlinearity, and mismatch, still significant angle errors may result from assembly tolerances of the magnet and the sensor. This work gives an analytical description of the angle error caused by tilts and eccentricities of magnet and sensor elements against the axis of rotation. Particular emphasis is given to worst case combinations of all tolerances. One part of the angle error can be cancelled by an optimized layout of the AMR-resistors. The remaining part is identical to the case of giant magneto-resistive (GMR) angle sensors. Errors of both AMR and GMR angle sensors are effectively reduced by identical optimization of the shape of magnets. One such optimized shape is disclosed.

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Section: Introductionsupporting

confidence: 52%

Section: Assembly Tolerancesmentioning

confidence: 80%

Section: Assembly Tolerancesmentioning

confidence: 99%

Section: Assembly Tolerancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Inaccuracies of Anisotropic Magneto-Resistance Angle Sensors Due to Assembly Tolerances

Ausserlechner¹

2012

PIER B

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Angle measurement technology based on magnetization vector for narrow space applications

Huang

Zhang

Le³

et al. 2020

Nanotechnology and Precision Engineering

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With the wide application of laser in the field of skin plastic surgery, micro laser galvanometer scanner has made great progress in this field with its portability. However, the measurement method used to measure the deflection angle of laser galvanometer in the narrow space of scanner with high precision remains to be studied. In this paper, an angle measurement method based on magnetic field is proposed, and the effect of the shapes of permanent magnets (PMs) on the measurement is studied by theoretical and experimental study under the condition that the maximum available space for the PMs is a 10 mm side cube. An angle measuring experimental device is set up, and the contrast experiment is carried out with different PMs which are the same as simulation. The experimental results show that cylindrical PM is more suitable than other PMs, which is consistent with the simulation results, and the maximum nonlinearity error is 0.562%. This method has the advantages of small volume, non-contact measurement, small moment of inertia, good dynamic response and no external excitation for the PMs, so it has a broad application prospect in micro laser galvanometer scanner.

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Analysis of a tunnelling magneto‐resistance‐based angle transducer

Sreekantan¹,

George²,

Kumar³

2014

IET Circuits, Devices & Systems

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An angle transducer that utilises tunnelling magneto-resistance (TMR) type sensor elements is presented and its performance is analysed. The signal conditioning circuit of the proposed angle transducer translates the sine-cosine outputs of a TMR sensor integrated circuit into an output that varies linearly with the sensing angle. An added advantage of the proposed scheme is that the output of the angle sensor is dictated, apart from the angle being sensed, only by a dc reference voltage. Thus good performance characteristics can be obtained from the proposed transducer very easily by using a precision dc voltage as the reference. Possible sources of errors that may affect the performance of the transducer are identified and their effects are quantified. Simulation studies conducted using SPICE demonstrates the ability of the scheme in providing a linear output across the entire 360°range. Experimental results obtained from a prototype unit built and tested, portray a worst-case error of < ±1.05%.

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Inaccuracies of Giant Magneto-Resistive Angle Sensors Due to Assembly Tolerances

Cited by 22 publications

References 12 publications

Inaccuracies of Anisotropic Magneto-Resistance Angle Sensors Due to Assembly Tolerances

Inaccuracies of Anisotropic Magneto-Resistance Angle Sensors Due to Assembly Tolerances

Angle measurement technology based on magnetization vector for narrow space applications

Analysis of a tunnelling magneto‐resistance‐based angle transducer

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