Development of a spherical reaction wheel actuator using electromagnetic induction

Kim, Dae-Kwan; Yoon, Hyungjoo; Kang, Woo-Yong; Yong-Bok, Kim; Choi, Hyung-Don

doi:10.1016/j.ast.2014.09.004

Cited by 32 publications

(12 citation statements)

References 15 publications

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“…Regarding performance analysis, current researches normally focus on the case of single-axis rotations to minimize the effects of cross couplings. In [11], torquespeed characteristics of a single-axis spinning reaction sphere were investigated through experiments on a prototype. To save development cost and allow researchers to evaluate designs before prototyping, [12] & [13] employed numerical simulations to examine performance characteristics as well as their dependencies on design variables.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Induction-Based Reaction Spheres

Zhu

Guo

Gill

2020

IEEE Trans. Ind. Electron.

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Induction-based reaction spheres have been presented in many references and their performances are normally investigated through experiments or numerical simulations which are time-consuming. Here, an analytical way is presented and it enables researchers to evaluate a new design quickly. The presented performance analysis is conducted through the classical equivalent circuit approach. Involved circuit parameters are determined through the magnetic flux density distribution which is a function of design variables. Based on this, the steady state torque-speed curve and the achievable maximum driving torque T * are identified. T * deviates from the maximum torque obtained from numerical simulations by only 3%. For validation, the presented performance analysis method is applied to an experimental case. Mean absolute percentage errors of predicted torque-speed curves are within 23% and mainly caused by end effects. The presented performance analysis method is generally applicable to induction-based spherical actuators, not only limited to reaction spheres. Additionally, since influences of design variables of the actuator have been formulated analytically through the determined circuit parameters, performance optimizations could be greatly facilitated.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Induction-Based Reaction Spheres

Zhu

Guo

Gill

2020

IEEE Trans. Ind. Electron.

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“…No mechanical output shaft exists in these spherical motors. The driving principle can be inductive [13][14][15][16][17][18][19], permanent magnet (PM) [7,8,20,21], hysteresis [22,23], variable reluctance [24] and ultrasonic [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…One class of inductive reaction spheres obtains this capacity via distributed electromagnets [16][17][18]. A 3D reaction sphere design is proposed in [17], where 3 pairs of electromagnets are put orthogonally in space.…”

Section: Introductionmentioning

confidence: 99%

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Design and Optimization of a Magnetically Levitated Inductive Reaction Sphere for Spacecraft Attitude Control

et al. 2019

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The inductive reaction sphere (RS) brings the benefit of simple, economical, and miniaturized design, and it is capable of multi-DOF torque generation. Thus, it is a suitable choice for the angular momentum exchange actuator in attitude control of micro-spacecrafts. To synthesize symmetric distribution of eddy currents and improve the speed and stability of rotation, a novel 4-pole winding design is proposed. However, the developed simplified analytical model shows that reduced pole number degrades the torque generation. To enhance the output torque of 4-pole RS, its curved cores and electromagnets are redesigned to enable the side teeth to be functional. As the analytical torque model for the RS with the slotted cores is not available, a constrained optimization problem is formulated, and the optimized parameters are calculated based on the prediction model from supported vector machine and finite element analysis. The lab prototypes are developed to validate the proposed design and test the speed performance. The experimental results show that the 4-pole RS prototype obtains a stable rotation over 700 rpm about X, Y and Z axis respectively with the angular momentum of 0.08 kg·m 2 /s, being superior to the 6-pole counterpart.

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“…In addition, the rotation requires a proper bearing which may introduce interferences to the driving unit. For example, reaction spheres proposed in [8] and [9] achieved magnetic levitation and single-axis rotation simultaneously. However, the 3-D rotations were implemented with air bearings [10], since the suspension flux introduces disturbance torques.…”

Section: Introductionmentioning

confidence: 99%

Analytical Field and Torque Analysis of a Reaction Sphere

2018

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In recent years, the increasing need in small satellite solutions triggers the miniaturization of attitude control systems. Reaction spheres were proposed as promising replacements of conventional reaction wheels for their 4π rotations. Since the generated control torques could be about any desired axes, a single reaction sphere is sufficient for three-axis stabilizations of spacecraft. This paper presents an innovative design of reaction spheres. Its driving unit is a combination of permanent magnets (PMs) and electromagnetic induction. This enables the generation of torques about three principle axes simultaneously. Meanwhile, a contactless bearing is integrated into the actuator design. Detailed designs and working principles of the reaction sphere are described. To investigate performance characteristics of the actuator, field modeling is of great importance and provides the basis for dynamics modeling. In this paper, an improved analytical model for dynamic fields excited by slotless distributed windings is presented for the first time. To study the cross coupling between PMs and electromagnetic induction, the static field generated by PMs is also modeled analytically. These developed models are validated through comparisons with numerical simulations. Electromagnetic torques generated by the actuator are calculated through the approaches of the Maxwell stress tensor and the Lorentz force law. Torque calculations based on the analytical field models deviate from those based on the numerical model slightly, with the maximum error within 4%. This means the presented analytical models allow to predict the electromagnetic field distribution and torques precisely.

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Development of a spherical reaction wheel actuator using electromagnetic induction

Cited by 32 publications

References 15 publications

Performance Analysis of Induction-Based Reaction Spheres

Performance Analysis of Induction-Based Reaction Spheres

Design and Optimization of a Magnetically Levitated Inductive Reaction Sphere for Spacecraft Attitude Control

Analytical Field and Torque Analysis of a Reaction Sphere

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