Contactless magnetic gear for robot control application

Komiyama, Hiroki; Uchimura, Yutaka

doi:10.1002/eej.22414

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…A decrease in the maximum load torque transmitted by the examined gear at higher rotational speeds can be observed. Such behavior of the MPG can be explained by the impact of the eddy current losses induced in the steel cores [28] and the permanent magnets as well as magneto-mechanical resonances occurring in the studied gear [29,30]. The impact of the load torque on the input torque of the studied MPG was examined next.…”

Section: Resultsmentioning

confidence: 99%

Simulation and Experimental Investigation of a Two-Stage Magnetic Precession Gear

2021

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Gears are common and important components of many types of propulsion systems applied in mechanical engineering. The aim of this paper is to present the mechanical design and performance analysis of a novel two-stage magnetic precession gear (MPG). The main advantage of the proposed design is the ability to obtain higher transmission ratios than other currently known magnetic gear types. A detailed analysis of the performance of the MPG was carried out employing a developed numerical model of the magnetic field in the proposed gear. The MPG model is based on the finite element method (FEM) and allows determining the relations between the torque acting on the main components of the gear, load angles, and air-gap lengths. To validate the developed FEM model, the prototype of an MPG with a 1/144 gear ratio was built and tested. The experiments were also focused on determining the mechanical efficiency as well as the influence of rotational speed and lengths of air gaps on the maximum load torque. The tests indicated that the maximum efficiency of the studied MPG is about 30%, which is comparable to the efficiency of mechanical two-stage precession gears with face meshing.

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Section: Resultsmentioning

confidence: 99%

Simulation and Experimental Investigation of a Two-Stage Magnetic Precession Gear

2021

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“…To realize his goal of enabling the robot to do a wide range of functions, Komiyama and Uchimura (2013) explain that a magnetic gear is applied to the robot to get a controller with multi-functionalities: positioning, force control, and velocity control. An approximation concept of cogging torque is implemented [18]. To make new implementations of such machines possible, Andrea Tilli and others present a unique control approach for doubly-fed induction units.…”

Section: -Literature Reviewmentioning

confidence: 99%

Magnetic Contactless Crank-rocker Machine

Ishtay¹,

Al-Dabbas

2022

Emerg Sci J

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Objective: In this paper, a proposed technique of motion transmission is introduced, which is based on the crank-rocker principle of motion. The energy transmission action is performed through magnetic force, in which no direct connection is made between the energy source input and the energy load output. Also, to illustrate the concept of motion and to approve the continuity of energy transmission using this proposed technique, a simple model of this mechanism has been built and run, showing the basic sequence of operation. Methodology/analysis: In this mechanical transmission mechanism, one side is rotating and the other side is vibrating, in which any side is energy input (which is usually the vibrating rocker), and the other side is energy output (which is the rotating crank). That seems similar to the classical crank-rocker machine in the four-bar mechanism, but without direct mechanical contact between the input and output energy stream. The concept of motion and mathematical analysis with structuring conditions is provided in this paper, where the dynamic analysis of the system is left for future work. A pilot physical prototype is manufactured and experimentally tested, validating the proposed design. Findings: The structural parameters of this proposed contactless crank-rocker machine have been modelled and simulated using the MATLAB program. It shows that these parameters could be selected and optimized to guarantee the minimum conditions for continued energy transmission. Based on these parameters, a simple model has been built and operated, which illustrates the concept of motion and validates the finding of MATLAB simulation. Novelty/improvement:Contactless crank-rocker motion is a very promising technique. It is possible to apply it in many applications, like the energy harvesting area, and it could be employed certainly in specific designs, such as MEMS, where no other motion transmission types can be used. Doi: 10.28991/ESJ-2022-06-02-07 Full Text: PDF

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Analysis of cogging torque in dual-stage magnetically geared devices considering magnetic flux coupling

Zhang

2020

Electr Eng

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Contactless magnetic gear for robot control application

Cited by 5 publications

References 18 publications

Simulation and Experimental Investigation of a Two-Stage Magnetic Precession Gear

Simulation and Experimental Investigation of a Two-Stage Magnetic Precession Gear

Magnetic Contactless Crank-rocker Machine

Analysis of cogging torque in dual-stage magnetically geared devices considering magnetic flux coupling

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