The Influence of PM’s Construction Parameters in Magnetic Coupler on Its Mechanical Torque

Pētīta magnētiskā sajūga konstrukcijas parametru ietekme uz tā galveno raksturlielumu - maksimālo mehānisko memomentu

The Comparison of Active and Reactive Magnetic Couplers

In this paper there are researched and compared three types of cylindrical magnetic couplers (MC): active MC, reactive MC with yoke and reactive MC without yoke. The comparison is made by the couplers' maximal mechanical torque, which is their main characteristic. The torque is calculated applying software QuickField by designing the magnetic field. The QuickField is based on the finite elements method. It is researched and recommended a new type of reactive MC. © 2012 IEEE

Formula Synthesis of Maximal Mechanical Torque on Volume for Cylindrical Magnetic Coupler

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

Start-up Torques of Permanent magnet Synchronous Generator with Non-Overlapping Concentrated Windings

In this paper there are analyzed the start-up torques of PMSGs that are directly connected to the turbine and are used in wind power plants (WPP). In such generators the start-up torques are high, which leads to necessity of faster wind to overpass the torque, but that shortens the diapason of working wind speed. There are researched the values of startup torques for PMSG's model with 3-phase winding on (Z1 = 18) stator teeth. The values are obtained by different design parameters, such as: PM's pole pair number, opened and half-opened slots. The torque is calculated in software QuickField

The Use of Magnetic Coupler instead of Lever Actuated Friction Clutch for Wind Plant

The purpose of the paper is to analyze the possibility to use a magnetic coupler instead of lever actuated friction clutch, which is used in the wind plants between the shaft from turbine and the shaft from motor. There are analysed the construction parameters of magnetic coupler to obtain the necessary coupler's mechanical torque. The paper includes the calculation of a mechanical torque, applying program QuickField. In QuickField there is calculated magnetic field using finite element method (FEM). © Kauno technologijos universitetas, 2012

The Influence of Permanent Magnets' Width and Number on the Mechanical Torque of a Magnetic Coupler with Rectangular Permanent Magnets

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 are made for actually operating magnetic couplers. The mechanical torque is calculated in QuickField and compared with an experimentally obtained mechanical torque. The most suitable combination of magnets' number and width has been found

Methods to Reduce the Cogging Torque in Permanent Magnet Synchronous Machines

The phenomenon of cogging torque in permanent magnet synchronous generators with concentrated windings is considered in this work. Dependence of fluctuation amplitude of the torque on width of stator slot opening is researched. The method to reduce the cogging torque by skewing of stator slot and opening of stator slot width equal distance between magnet and tooth on the rotor is described. The construction of this generator is obtained on the basis of numerical simulation results