Design and experimental evaluation a novel magneto-rheological brake with tooth shaped rotor
About: This article is published in Smart Materials and Structures.The article was published on 2022-01-01 and is currently open access. It has received 1 citations till now. The article focuses on the topics: Rotor (electric) & Brake.
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01 Jun 2023
TL;DR: Li et al. as mentioned in this paper proposed a PM-electromagnet brake with rolling balls embedded in the friction plate, which has significant advantages of higher torque-to-size ratio, lower power consumption and quicker brake response speed.
Abstract: This paper proposes a novel PM-electromagnet brake with rolling balls embedded in the friction plate, which has significant advantages of higher torque-to-size ratio, lower power consumption and quicker brake response speed. The structural innovations of the proposed brake are mainly reflected in the following two aspects: 1. The torque springs are replaced by high-performance PMs to reduce power consumption during Brake-Holding Mode; 2. Rolling-balls are embedded in the friction plate to increase the braking torque. In addition, an optimized brake circuit is designed to improve the brake response speed by shortening the inductor discharging time. Firstly, the structural innovations of proposed brake are presented and discussed in detail. Then, theoretical analysis mainly focuses on the following two aspects: 1. How the rolling ball-embedded structure can improve the torque-to-size ratio; 2. How the distributed PMs can reduce the power consumption during Brake-Holding Mode. At last, the optimized brake circuit is given. To verify the benefits of the design, a proposed brake prototype is manufactured, as well as the optimized brake circuit. The experimental result is promising, and the proposed brake is suitable for various applications.
References
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TL;DR: In this paper, the authors present the state of the art of an actuator with a control arrangement based on magneto-rheological fluid (MRF) technology, and show that excellent features like fast response, simple interface between electrical power input and the mechanical power output, and controllability make MRF the next technology of choice for many applications.
355 citations
TL;DR: In this article, a magnetorheological (MR) brake prototype was designed, fabricated and tested, and the effects of magnetic field and rotary speed on the transmitted torque were addressed, and an amplifying factor was introduced to evaluate the brake performance.
Abstract: A new magnetorheological (MR) brake prototype was designed, fabricated and tested. Firstly, the rheological properties of MR fluids, in particular the dynamic yield stress, were experimentally investigated based on a Bingham plastic model. The working principles of the MR brake were then analysed and discussed. The equations for transmitted torque were derived and used to evaluate the disc-shaped MR brake. This was followed by an analysis of an electromagnet using the finite element method. Following the manufacturing and fabrication of a brake prototype, the mechanical performance of the MR brake was experimentally evaluated with a specially designed test rig. The effects of magnetic field and rotary speed on the transmitted torque were addressed, and an amplifying factor was introduced to evaluate the brake performance. It was found that brake torque increased steadily with the increment of magnetic field or rotary speed. The amplifying factor showed an increasing trend with the magnetic field but a decreasing trend with rotary speed.
282 citations
TL;DR: The Mo-TiO2@NC electrode as discussed by the authors showed initial discharge and charge capacities of 850.7 and 548.3 mAh g-1 at a current density of 85 mA g −1, respectively, with a remarkable discharge capacity maintained at 449.2mAh g−1 after 100 cycles.
Abstract: For improving the capability, cycling stability and rate capacity of anatase TiO2-based electrode, Mo-doped TiO2 anatase encapsulated in nitrogen-doped amorphous carbon (denoted for Mo-TiO2@NC) were synthesized through a facile hydrothermal method and followed by coating with polyaniline (PANI) and heating treatment. When tested as anode for lithium ion batteries, the Mo-TiO2@NC electrode showed initial discharge and charge capacities of 850.7 and 548.3 mAh g-1 at a current density of 85 mA g-1, respectively, with a remarkable discharge capacity maintained at 449.2 mAh g-1 after 100 cycles. Even at high current density of 850 mA g-1, a reversible capacity of 154 mAh g-1 after 200 cycles is obtained, displaying good rate capacity and long-term cycling stability. The outstanding electrochemical performance of Mo-TiO2@NC could be attributed to the synergistic effect of aliovalent ions doping and carbon coating.
245 citations
TL;DR: A recent progressive review on magneto-rheological materials technology is presented in this paper, focusing on numerous application devices and systems utilizing magneto rheology materials, including fluids, foams, grease, elastomers, and plastomers.
Abstract: Smart materials are kinds of designed materials whose properties are controllable with the application of external stimuli such as the magnetic field, electric field, stress, and heat. Smart materials whose rheological properties are controlled by externally applied magnetic field are known as magneto-rheological materials. Magneto-rheological materials actively used for engineering applications include fluids, foams, grease, elastomers, and plastomers. In the last two decades, magneto-rheological materials have gained great attention of researchers significantly because of their salient controllable properties and potential applications to various fields such as automotive industry, civil environment, and military sector. This article offers a recent progressive review on the magneto-rheological materials technology, especially focusing on numerous application devices and systems utilizing magneto-rheological materials. Conceivable limitations, challenges, and comparable advantages of applying these magn...
180 citations
TL;DR: In this article, the design method of the cylindrical magneto-rheological fluid brake is investigated theoretically and the equation of the torque transmitted by the annular fluid within the brake is derived.
179 citations