Abstract
Abstract 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.
Highlights
A magnetic coupler (MC) is a mechanism that is used to transfer the mechanical torque without a contact of the two main parts called half couplings
The most suitable formula is tested by design parameters values which are between variants made for formula synthesis
First the formula synthesis was made for three variables: proportionality coefficient β, axial length l and Permanent magnets (PMs) height h
Summary
A magnetic coupler (MC) is a mechanism that is used to transfer the mechanical torque without a contact of the two main parts called half couplings. The most suitable formula is tested by design parameters values which are between variants made for formula synthesis Such variables have been analysed: permanent magnets’ height h (with values in millimetres – 6, 6.5, 7, 7.5, 8), proportionality coefficient β (with values – 0.7, 0.8, 0.9) and axial length l (with values in millimetres – 30, 32, 34, 36, 38). As the height of yoke is calculated (2), every change of PMs height h, coefficient β and pole pair number p lead to design changes and the influence is direct and indirect on the maximal mechanical torque. In this paper just one value of pole pair number interval (p = 3) was chosen to be used for finding out if in this case it would be easier to synthesize reliable formula for the goal function for planned optimization. It is necessary because in some cases it can be very small, e.g. 3.6 mm, but in the further planned optimization program for the best choice it will be controlled, that the yoke cannot be less than 5 mm – the reputed value for electrical machine yoke by physical strength [9]
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