Flux measurement and conditioning system for heteropolar active magnetic bearing using Kapton-foil Hall sensors

Mystkowski, Arkadiusz; Kierdelewicz, Andrzej; Jastrzębski, Rafał P.; Dragašius, Egidijus; Eidukynas, Darius

doi:10.1016/j.ymssp.2018.05.055

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…Using the standard protocols of the Van der Pauw measurements from the National Institute of Standards and Technology 39 , a carrier mobility, µ = 736 cm 2 V −1 s −1 , and a sheet carrier density, n = 5.6 × 10 14 cm −2 , were found at room temperature. The obtained values are comparable with flexible bismuth 9 , graphene 10,40 , and metal-based 41 Hall sensor elements on PI, PEEK, and Kapton Foil substrates. Meanwhile, the offset in the Hall voltage arises from misalignment of contacts and/or inhomogeneous current flow in the active sensor area.…”

Section: Magneto-electro-mechanical Responsesupporting

confidence: 64%

Flexible Hall sensor made of laser-scribed graphene

et al. 2021

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Graphene has shown considerable potential for sensing magnetic fields based on the Hall Effect, due to its high carrier mobility, low sheet carrier density, and low-temperature dependence. However, the cost of graphene in comparison to conventional materials has meant that its uptake in electronic manufacturing has been slow. To lower technological barriers and bring more widespread adoption of graphene Hall sensors, we are using a one-step laser scribing process that does not rely on multiple steps, toxic chemicals, and subsequent treatments. Laser-scribed graphene Hall sensors offer a linear response to magnetic fields with a normalized sensitivity of ~1.12 V/AT. They also exhibit a low constant noise voltage floor of ~ 50 nV/$$\sqrt {{\mathrm{Hz}}}$$ Hz for a bias current of 100 µA at room temperature, which is comparable with state-of-the-art low-noise Hall sensors. The sensors combine a high bendability, come with high robustness and operating temperatures up to 400 °C. They enable device ideas in various areas, for instance, soft robotics. As an example, we combined a laser-scribed graphene sensor with a deformable elastomer and flexible magnet to realize low-cost, compliant, and customizable tactile sensors.

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Section: Magneto-electro-mechanical Responsesupporting

confidence: 64%

Flexible Hall sensor made of laser-scribed graphene

et al. 2021

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“…The experimental set-up consists of 4 main elements: Motor, two radial heteropolar active magnetic bearings (AMBs), safety ball bearings, a rotor with two unbalance disks, and the energy harvester system. The AMB detail description and overview of the AMB test rig is given in the previous studies [21,22]. Is given in the previous paper [21,22].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The AMB detail description and overview of the AMB test rig is given in the previous studies [21,22]. Is given in the previous paper [21,22]. The AMB electromagnetic force is a nonlinear function of the coil current and rotor displacement.…”

Section: Experimental Set-upmentioning

confidence: 99%

Experimental Study of Macro Fiber Composite-Magnet Energy Harvester for Self-Powered Active Magnetic Bearing Rotor Vibration Sensor

Mystkowski

Ostaševičius

2020

Energies

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The paper presents the design, fabrication, and characterization of an energy harvester for an active magnetic bearing (AMB) rotor vibration using a macro fiber composite (MFC) with magnetic coupling. The MFC cantilevers configuration, together with neodymium magnets, is used for the contact-free rotor radial vibration self-powered sensor. The permanent magnets attached to the rotor and to the four MFC element beams ensure the mechanical energy transfer and the MFC cantilever vibration excitation. In the proposed prototype, the MFC transducer output voltage depends on the air-gap between two magnets. This paper investigates the optimum conditions to harvest as much as possible electric energy at different clearances and rotational speeds. Furthermore, to assess the rotor vibration sensitivity, the experimental results of the MFC-magnet self-powered sensor are compared with measurements obtained using a fiber optic sensor. The maximal obtained harvesting power equals 673.47 µW for the rotor speed of 3150 rpm. Moreover, the MFC cantilever was proposed as the rotor vibration sensor. The MFC-magnet self-powered vibration sensor output was compared with the fiber optic laser sensor. The mismatched vibration amplitude for both sensors does not exceed 1 µm.

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“…The air gap is generally very narrow and is only about 10 −1 mm long. For the measurement methods for air gap magnetic fields, there are currently two main types: direct measurement methods [18][19][20] and indirect measurement methods [7,21,22]. The direct measurement mainly uses a linear Hall-effect flux sensor to directly detect the air gap magnetic field distribution.…”

Section: Introductionmentioning

confidence: 99%

“…The direct measurement mainly uses a linear Hall‐effect flux sensor to directly detect the air gap magnetic field distribution. In [18], a Hall sensor that can be attached to the stator surface was used to measure the air gap flux of an axial flux motor. In [19], 36 Hall flux sensors were installed in the air gap to detect the rotor fault and eccentricity of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Characteristic analysis and direct measurement for air gap magnetic field of external rotor permanent magnet synchronous motors in electric vehicles

Zhou

Yang

et al. 2020

IET Electric Power Applications

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In this study, the air gap magnetic field characteristics of external rotor permanent magnet synchronous motors (PMSMs) under both the stator and rotor coordinate systems considering low‐order current harmonics and high‐order sideband current harmonics are analysed. A direct measurement technique (DMT) for air‐gap magnetic field is proposed. First, an analytical model of air gap magnetic field of external rotor PMSMs is established. The spatial order and frequency characteristics of stator/rotor air gap magnetic field are revealed. Then, a 24‐pole 27‐slot external rotor PMSM is taken as an example. The analytical and finite element (FE) results are compared and analysed. The difference of the spatial order and frequency characteristics between the stator and rotor air gap magnetic field are verified. Next, a new DMT is proposed, which can detect the precise distribution and local microscopic characteristics on the order of 10−1 mm with high resolution. The accuracy of analytical and FE model are verified by the DMT and an indirect experimental test of no‐load back electromotive force. Finally, the mechanical challenges of in‐wheel motors and the practicablility of DMT for eccentricity detection are further discussed.

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Flux measurement and conditioning system for heteropolar active magnetic bearing using Kapton-foil Hall sensors

Cited by 10 publications

References 9 publications

Flexible Hall sensor made of laser-scribed graphene

Flexible Hall sensor made of laser-scribed graphene

Experimental Study of Macro Fiber Composite-Magnet Energy Harvester for Self-Powered Active Magnetic Bearing Rotor Vibration Sensor

Characteristic analysis and direct measurement for air gap magnetic field of external rotor permanent magnet synchronous motors in electric vehicles

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