A new design of small-sized magnetorheological brakes based on the mixed mode operation for high torque efficiency

Song, Byung-Keun; Hong, Seong-Woo; Kim, Bo-Gyu; Choi, Seung‐Bok

doi:10.1088/1361-665x/ac277e

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…The MRF brake or clutch is normally designed following the multi-disc model presented in [61][62][63]. MRF brake has many modifications, including the conventional model with a single coil in [42,64,65], and a floweredge section model [66] for increasing the contacted area. It can be defined as a multi-coil, as shown in [42], for improving the magnetic field and optimizing the operation coil.…”

Section: Mrfmentioning

confidence: 99%

A review on design and modelling methods of magnetic circuit cores for MR elastomers and MR fluids based system

Do,

Choi

2024

Smart Mater. Struct.

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In this review article, different structural types of the magnetic core required for activation of magnetorheological elastomer (MRE) and magnetorheological fluid (MRF) are introduced in terms of design feature, magnetic flux analysis and performance, installation with primary structure and close relationship to material types. As a first step, dynamic functions related to the chosen models are summarized and discussed according to the magnetic field variations including the field-dependent damping force and torque of the application systems. To address on the practical feasibility, main issues of design process are also pointed out and are discussed stating the manufacturing feasibility and the scaled factors of dynamic variables. Then, after analysing the featured models and dynamic functions, the derivation approaches to establish mathematical models of the magnetic circuit core are provided and compared as a valuable reference for checking both simplicity and accuracy. In this stage, the chosen symbolized magnetic circuit models are clearly described about linear or/and nonlinear behaviours of the input (current) and output (magnetic field). In addition, a couple of commercial software to design the magnetic circuit model is introduced since they can be effectively adopted to analyse the magnetic circuit cores of many application systems utilizing MRE and MRF without any difficulty.

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Section: Mrfmentioning

confidence: 99%

A review on design and modelling methods of magnetic circuit cores for MR elastomers and MR fluids based system

Do,

Choi

2024

Smart Mater. Struct.

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“…Magnetorheological grease materials have advantages such as good resistance to settling, leakage prevention, strong magnetorheological effects, and ease of preparation, as their viscosity is based on a combination of liquid magnetorheological fluid and solid magnetorheological elastomers. Therefore, they have found wide application in devices such as dampers [ 5 ], buffers [ 6 ], clutches [ 7 ], and brakes [ 8 ], and have promising prospects for further use. However, magnetorheological greases still have some drawbacks, such as high zero-field viscosity and susceptibility to shear-thinning.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sepiolite on the Field-Dependent Normal Force of Magnetorheological Grease

Wang

et al. 2023

Materials

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In order to investigate the influence of sepiolite minerals on the normal force of magnetorheological grease (MRG), a mixed sample (ALCH) on the basis of preparing an aluminum–lithium-based magnetorheological grease (base sample ALC), containing sepiolite was further prepared. The field-dependent normal force of the two samples was tested using a rotational rheometer, considering conditions such as magnetic field, time, strain amplitude, frequency, and temperature, and the results were compared. The results indicate that sepiolite limits the field dependent normal force of the magnetorheological grease under steady state shear, and is unaffected by magnetic field, time, temperature, and shear rate. Sepiolite has minimal impact on the transient response of the magnetorheological grease. Under oscillatory shear, the magnetic field is an important factor influencing the field-dependent normal force response of the sepiolite-magnetorheological grease (ALCH). At low magnetic fields, the field-dependent normal force of the sepiolite-containing sample (ALCH) is greater than that of the base sample (ALC), while this relationship is reversed at high magnetic fields, unaffected by other factors. Under long-term shear conditions, both samples exhibit good shear stability, as well as consistency at different frequencies and strain amplitudes. However, an increase in shear rate reduces the normal force, and temperature also affects the field-dependent normal force. The patterns of variation in steady-state and oscillatory shear modes are not entirely the same, but both exhibit a characteristic decrease with increasing temperature under high magnetic field intensities. Sepiolite can reduce the temperature sensitivity of the normal force of the magnetorheological grease. In conclusion, the introduction of sepiolite is beneficial for the application of magnetorheology in high-precision devices.

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“…The magnetorheological clutch was allowed to operate as the main clutch. Song et al (2021) designed a small magnetorheological brake based on a hybrid mode of shear and flow, which can provide higher torque using a relatively small amount of the magnetorheological fluid. Tian et al (2022) studied the time response characteristics of MRTDs and found that changing the parameters of the excitation coil and the number of taps can effectively shorten the current response time.…”

Section: Introductionmentioning

confidence: 99%

Performances of Planetary Magnetorheological Transmission Devices

Zhu

Dong

et al. 2022

Front. Mater.

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Magnetorheological transmission devices (MRTDs) are a type of power transmission device using magnetorheological fluids (MRFs) as the transmission medium, which have the advantages of rapid response and continuously adjustable output performances. A new type of structure of planetary MRTDs is proposed to improve the performances of MRTDs in this study. A planetary MRTD was fabricated, and the performances of it were tested on the self-made testing system. The experimental results show that the continuously variable transmission of MRTDs under constant torque can be realized by adjusting the excitation current. The output speed or torque can be adjusted by adjusting the control current when the input speed is constant. The output torque increases with the increase in the input speed when the excitation current is constant. The performances of the MRTD were analyzed according to the properties of MRFs in complex flow and magnetic field. MRFs in complex flow and magnetic fields can produce more stable and higher responses to external magnetic fields than being simple sheared; thus, the planetary MRTDs have better performances and are useful structures for the application of MRFs in transmission.

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A new design of small-sized magnetorheological brakes based on the mixed mode operation for high torque efficiency

Cited by 9 publications

References 39 publications

A review on design and modelling methods of magnetic circuit cores for MR elastomers and MR fluids based system

A review on design and modelling methods of magnetic circuit cores for MR elastomers and MR fluids based system

Effect of Sepiolite on the Field-Dependent Normal Force of Magnetorheological Grease

Performances of Planetary Magnetorheological Transmission Devices

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