Bandwidth extension of hybrid-reluctance-force-based tip/tilt system by reduction of eddy currents

Csencsics, Ernst; Schlarp, Johannes; Schitter, Georg

doi:10.1109/aim.2017.8014176

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…Vibration of the legs may introduce structural modes to the system transfer function, hence a stiff design of the stator is mandatory. With the intention of reducing the diffusion of eddy currents, and therefore, the resulting phase lag in the system, a layered design of the ferromagnetic yoke is targeted [21]. In order to ensure an even distribution of the biasing flux to all legs of the actuator, the permanent magnet is placed at the intersection of the yokes of both axes.…”

Section: Mechanical System Designmentioning

confidence: 99%

High Precision Hybrid Reluctance Actuator With Integrated Orientation Independent Zero Power Gravity Compensation

Stadler

Csencsics

Ito

et al. 2022

IEEE Trans. Ind. Electron.

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Section: Mechanical System Designmentioning

confidence: 99%

High Precision Hybrid Reluctance Actuator With Integrated Orientation Independent Zero Power Gravity Compensation

Stadler

Csencsics

Ito

et al. 2022

IEEE Trans. Ind. Electron.

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“…1, eddy currents and hysteresis in the ferromagnetic yoke and mover cause a phase lag that limits the achievable closed-loop system bandwidth of the actuator [12]. Such phase lag can be reduced by replacing the solid outer yoke with a laminated one, consisting of several insulated layers of ferromagnetic material [31]. Therefore, in this paper, two different configurations of the actuator shown in Figure 2 are analysed via FEA, one featuring a solid, the other one a laminated outer yoke.…”

Section: System Descriptionmentioning

confidence: 99%

Multiphysics finite element model for the computation of the electro-mechanical dynamics of a hybrid reluctance actuator

Cigarini

Csencsics

Schlarp

et al. 2020

Mathematical and Computer Modelling of Dynamical Systems

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In hybrid reluctance actuators, the achievable closed-loop system bandwidth is affected by the eddy currents and hysteresis in the ferromagnetic components and the mechanical resonance modes. Such effects must be accurately predicted to achieve high performance via feedback control. Therefore, a multiphysics electromechanical finite element model is proposed in this paper to compute the dynamics of a 2-DoF hybrid reluctance actuator. An electromagnetic simulation is adopted to compute the electromagnetic dynamics and the actuation torque, which is employed as input for a structural dynamic simulation computing the electromechanical frequency response function. For model validation, the simulated and measured frequency response plots are compared for two actuators with solid and laminated outer yoke, respectively. In both cases, the model accurately predicts the measurement results, with a maximum relative phase error of 1.7% between the first resonance frequency and 1 kHz and a relative error of 1.5% for the second resonance frequency..

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“…However, they are still visible even with the damping materials. Additionally, the phase plot shows a large phase lag beyond 800 Hz, which might be partially due to the residual eddy current (18) . Because these dynamics influence position control design, they are modeled by extending the analytical model as follows P(s) = P a (s)P p (s)e −sT d ,· · · · · · · · · · · · · · · · · · · · · · · · · ·(6)…”

Section: System Identificationmentioning

confidence: 99%

“…In contrast, hybrid reluctance actuators generate a force proportional to the current by using a permanent magnet, achieving a motor constant higher than Lorentz actuators (10) . For the advantages, hybrid reluctance actuators have been applied to fast tool servos (14) (15) , active vibration isolators (16) and steering mirrors (17) (18) . However, hybrid reluctance actuators exhibit mechanical modes and hysteresis (10) together with eddy current influencing the dynamics (18) .…”

Section: Introductionmentioning

confidence: 99%

“…Around the mover, a C-core is fixed to the mechanical ground as the stator together with a permanent magnet and two identical coils. Both the mover and the stator are made from laminated electrical steel sheets (EN10025-S235JR), which reduce the eddy current in comparison to solid blocks (18) . The achievable closed-loop bandwidth is typically restricted by the second and higher mechanical resonances in the case of low-stiffness actuators.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-speed Scanner with Nanometer Resolution Using a Hybrid Reluctance Force Actuator

et al. 2019

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This paper proposes a high-precision, high-speed scanner using a hybrid reluctance actuator, which can be stronger than conventionally used comparable Lorentz force actuators. For compactness, its mover is guided by flexures and laterally moved by a hybrid reluctance actuator with a voltage amplifier. To reject disturbances such as thermal drift and hysteresis, the scanner is regulated by cascade control, for which parasitic resonances are damped partially mechanically. As a result, the closed-loop system realizes a high control bandwidth of 3.5 kHz and a high positioning resolution of 0.8 nm at a static point. For high-speed scanning motion, modeling-free inversion-based iterative control (IIC) is proposed to be combined with the cascade control as the scanner's feedforward controller. Experiments demonstrate that the scanner with the cascade control realizes a 2 μm triangular motion at 400 Hz with a tracking error of 101 nm, and the modeling-free IIC successfully decreases this relatively large error by a factor of 26 to 3.8 nm.Consequently, this paper clearly demonstrates that the proposed scanner with the hybrid reluctance actuator can realize high-precision, high-speed scanning motion.

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Bandwidth extension of hybrid-reluctance-force-based tip/tilt system by reduction of eddy currents

Cited by 14 publications

References 15 publications

High Precision Hybrid Reluctance Actuator With Integrated Orientation Independent Zero Power Gravity Compensation

High Precision Hybrid Reluctance Actuator With Integrated Orientation Independent Zero Power Gravity Compensation

Multiphysics finite element model for the computation of the electro-mechanical dynamics of a hybrid reluctance actuator

High-speed Scanner with Nanometer Resolution Using a Hybrid Reluctance Force Actuator

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