Fig 2 - uploaded by Svetlana Orlova
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The magnetic coupling machine's cross section with the main dimensions: R1, R2, R3, R4, R5, R6, R2', R5' and Rδ -radiuses, b -permanent magnet's width, h -permanent magnet's height.
Source publication
The purpose of this paper is to analyze the influence of permanent magnets' number and width on the torque of a magnetic coupler, which has rectangular form permanent magnets. The work includes the calculation of a mechanical torque, applying program QuickField, which calculates magnetic field, using finite element method (FEM). The calculations ar...
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Citations
... The PM thickness changes the average flux density in the air gap and, hence, the transmitted torque [55]. The thickness of the inner rotor PMs is set at 4 mm because the maximum increase in the torque density is met, as shown in Figure 10a. ...
The integration of compact concepts and advances in permanent-magnet technology improve the safety, usability, endurance, and simplicity of unmanned aerial vehicles (UAVs) while also providing long-term operation without maintenance and larger air gap use. These developments have revealed the demand for the use of magnetic couplers to magnetically isolate aircraft engines and starter-generator shafts, allowing contactless torque transmission. This paper explores the design aspects of an active cylindrical-type magnetic coupler based on finite element analyses to achieve an optimum model for hybrid UAVs using a piston engine. The novel model is parameterised in Ansys Maxwell for optimetric solutions, including magnetostatics and transients. The criteria of material selection, coupler types, and topologies are discussed. The Torque-Speed bench is set up for dynamic and static tests. The highest torque density is obtained in the 10-pole configuration with an embrace of 0.98. In addition, the loss of synchronisation caused by the piston engine shaft locking and misalignment in the case of bearing problems is also examined. The magnetic coupler efficiency is above 94% at the maximum speed. The error margin of the numerical simulations is 8% for the Maxwell 2D and 4.5% for 3D. Correction coefficients of 1.2 for the Maxwell 2D and 1.1 for 3D are proposed.
... al. and Orlova et. al. in order to determine the relation between key design parameters of such magnetic drives and develop a methodology for numerical model development [23][24][25][26][27]. Based on previously performed research, prior manufacturing of the magnetic mixers for both 5 dm 3 and 15 m 3 bioreactors the magnetic field distribution was simulated in order to evaluate the theoretical maximal torque. ...
We introduce a novel magnetically coupled mixer drive for biotechnological, pharmaceutical and chemical applications requiring high-grade aseptic conditions. The proposed design enables its application in larger volume bioreactors compared to traditional magnetic drives, due to a possibility of introducing higher power quantities per individual rotor, while ensuring higher mixing intensity.
In the following study, we provide information on the design aspects of the novel magnetic drive and demonstrate the principles behind both theoretical and experimental maximal torque and other key working parameter evaluation. Based on the mentioned principles, magnetic mixer drives were developed for laboratory (5 dm3) and pilot-scale (15 m3) bioreactors. The specific power inputs relative to the agitation rates for the mentioned mixers were experimentally determined in water for two impeller types: six-bladed Rushton and three-bladed Pitched-blade turbines. The performance of the novel magnetic drive was evaluated during Kluyveromyces marxianus cultivations utilizing whey (a well known byproduct of the dairy industry) as the main substrate source in the 15 m3 bioreactor.
The obtained results show that the novel magnetic drive can be successfully applied in 15 m3 bioreactors, while providing sufficient mixing of the cultivation broth for biomass growth.
... Tian et al. explored the influences on the disk deformation of the disk-shape magnetic clutch with respect to transmission torque [20]. Ose et al. presented the influence by width and number of permanent magnets on the transmission torque [7]. However, the research regarding the torque control by the adjustable eddycurrent MCs has hardly been reported. ...
A novel eddy-current Magnetic Clutch (MC) unit with its torque-adjustable mechanism is proposed by this research. As to mechanical structure, the MC unit is mainly constituted by a squirrel-cage inner rotor and a magnet-embedded outer rotor. The transmitted output torque can be adjusted by either the Overlapped Length (OL) or the relative angular velocity between outer rotor and inner rotor. Firstly, the mathematical model of the MC system is developed. Secondly, the features and characterization of the MC unit are explored by intensive experiments under various overlapped length and relative rotational speed between inner rotor and outer rotor. The major novelties of the MC system unit include: (i). being very handy to operate even for non-professional users, (ii). the output torque of the proposed MC can be adjusted automatically, and (iii). the proposed MC can be easily incorporated to any torque control system. To examine the validity of the MC unit, two control strategies, i.e., PID action and pole-placement method are presented and compared for the performance of the closed-loop feedback systems. In addition, the locations of system roots are found to ensure the stability of the torque control loops. At last, several experiments are undertaken, including constant torque control and variable torque control. Particularly, an experiment of screw-driven into a wooden board is conducted to illustrate the drilling quality much upgraded by the proposed torque control device. Besides, a couple of torque-tracking experiments realistically manifest the quick response and high precision of the MC unit. In summary, either for stability or performance, the proposed MC feedback system is eligible to execute superior torque tracking or torque regulation.
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In this paper the influence of basic design parameters (proportionality coefficient β and permanent magnets height h) on the mechanical torque for cylindrical magnetic coupler with rounded permanent magnets is researched. Such cylindrical magnetic couplers are often used in pumps and liquid mixers. At the beginning the design parameters and their relevance are explained. The mechanical torque is calculated applying the software QuickField. In the data analysis and for the coupler comparison the division of maximal mechanical torque on volume is taken as the main characteristic. Because of the planned optimization for the calculated variants there were synthesized few formulas, from which the most suitable were found (for all researched design parameters’ ranges). The formulas are synthesized using a program, which is created by Oskars Onzevs. The program for the formula synthesis is based on regression models, and the basic principles of it are explained. All the calculations for experimental and formula data are made for magnetic coupler’s design with one pole pair number p that is equal to three.
Permanent magnet couplings are widely used in applications requiring torque to be transmitted through an airgap. The aim of this study is to observe and explain the effect of radial and axial misalignment in a 12-pole, cylindrical permanent magnet coupling. Pull-out torque was measured for two coupling pairs which showed an increase of 3.1% and 3.8%, respectively, at maximum radial misalignment. When modeled in finite element analysis software, the coupling produces 3.7% more static pull-out torque than the aligned case. For axial misalignment the pull-out torque at different misalignment distances was measured and simulated. An insignificant reduction in pull-out torque was observed for small misalignment, whereas it decreases linearly with misalignment distance when above 3-4 mm. These results show that radial and axial misalignment do not adversely affect static torque performance, though the affect on non-static performance is not considered and may be detrimental.
A parametric design optimization routine has been applied to a novel magnetic coupling with improved recyclability. Coupling designs are modeled in a 3-D finite element environment, and evaluated by three design objectives: pull-out torque, torque density by magnet mass, and torque density by total mass. Magnet and outer core thicknesses are varied discretely, whereas outer dimensions and air-gap length are kept constant. Comparative trends as a function of pole number and dimensions are depicted. A compromise exist between the design objectives, in which favoring one might reduce the other two significantly. Index Terms-Finite element analysis, magnetic Couplings, permanent magnets, recycling Nd-Fe-B, static torque performance, torque measurement.
The design and construction of an easy-to-use test-rig for permanent magnet couplings is presented. Static torque of permanent magnet couplings as a function of angular displacement is measured of permanent magnet couplings through an semi-automated test system. The test-rig is capable of measuring torque up to 240 Nm (in increments of 0.1 Nm) at a angular step of 0.0011 degrees (mechanical). Axial, radial, and angular misalignment can be imposed on the coupling in order to study abnormal and faulty operating conditions. This can also be used to assess installation tolerances. Measured data is stored in a USB thumb-drive, and no additional software or hardware is needed to operate the test-rig. Tests of the aligned static torque performance of two different cylindrical couplings are presented along with radial and axial misalignment-tests of one. The results demonstrates the diversity and usefulness of the the designed test-rig. Furthermore, the coupling-performance shows a clear influence of end-effects for axially short couplings, and are found to be very robust to small misalignment.
