Free Angular-Positioning Wireless Power Transfer Using a Spherical Joint

Abstract

Many studies have investigated resonator structures and winding methods. The aims of this paper are as follows. First, the paper proposes an optimized winding model for a bio-inspired joint for a wireless power transfer (WPT) system. The joint consists of a small spherical structure, which rotates inside a hemispherical structure. The transmitter coil (Tx) is wound on the hemisphere structure, and the receiver coil (Rx) is wound on the small sphere. The power is transferred while rotating Rx over a wide range of angular misalignment. In addition, the algorithm design of the proposed winding method is given to get an optimized model. Moreover, the circuit analysis of the WPT system is discussed. Second, the magnetic field density is investigated considering a safety issue, which is linked to human exposure to electromagnetic fields (EMFs). Moreover, EMF mitigation methods are proposed and discussed in detail. Finally, the simulation results are validated by experiments, which have confirmed that the proposed winding method allows the system to rotate up to 85 degrees and achieve an efficiency above 86%. The proposed winding method for the WPT system can be a good technique for some robotic applications or a future replacement of the human joint.

Development of novel customized pressure distribution surface for reduction of pressure ulcers using additive manufacturing technology

“…This type of joint allows for a wider range of motion and also permits movements in all planes and rotational movement around the central axis. It has three rotational degrees of freedom between the two attached components (Houran et al , 2018). The two components are free to rotate relative to each other along all three axes.…”

A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications

“…Similarly to the transmitting side, the receiving side could have several variations, which are referred to in capital letters such as primary-secondary topology. The configuration of circuities for WPT transfer is reviewed in a few recent papers (Jiang et al, 2017a;Abou Houran et al, 2018). The LCL hybrid configuration has shown in many articles to be the most used valid alternative to the basic topologies, and a very interesting correlation has been studied in Liu et al (2016) where S-S and S-P are compared with the LCL-S, LCL-P, LCL-LCL and S-LCL, respectively in Fig.…”

“…In the last year, a considerable amount of studies focused on WPT applications have been published. Although recent WPT reviews are reported, there is less reference in one of the most important aspects such as the maximum distance achieved in the applications (Abou Houran et al, 2018). In a WPT system, the possibility to achieve long distances is very attractive but at the same time, it is very difficult.…”

“…2 and listed in Table 1 where the most important parameters are displayed. The topic is a recent trend of research and very extensive, thus a review for the whole topic becomes long and exhausting for the reader (Abou Houran et al, 2018;Liu et al, 2018).…”

Directional Characteristics of Wireless Power Transfer via Coupled Magnetic Resonance

“…In the article [21], a bowl-mounted launch mechanism is proposed, which can basically achieve "non-directional" within the charging range, but it does not indicate the specific anti-offset standard. The article [22] proposes an anti-offset charging system similar to the shape of joints, but there are space limitations. The article [23] uses Helmholtz coils to design a three-dimensional transmitting mechanism and realizes omnidirectional wireless charging, but the directional attenuation range is not regulated.…”