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We aimed to evaluate the biomechanical contact characteristics of rotating hinge knee (RHK) prostheses with different motion axial systems. We performed finite element (FE) analyses to investigate and compare the peak contact stress and contact location on tibial insert and bushing during a gait cycle. The biaxial (BA) system and spherical center axial (SA) system RHK prostheses were included in this...
In this paper, the method of magnetic poles shifting was combined with optimization method to reduce cogging torque in solid-rotor permanent-magnet synchronous motors. Although the finite-element method (FEM) can calculate the cogging torque accurately, to find the peak value of cogging torque, the cogging torque for different relative positions between permanent magnets and slots must be calculated;...
This paper presents the operational principles, design and transient analysis of a new three-phase 12/14-pole doubly salient electrical magnet (DSEM) generator for its application in direct-driven wind power generation. Design equations, finite element and dynamic analysis of the new generator are described. The 12/14-pole DSEM generator with constant self-inductance has lower voltage ripple compared...
It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when permanent magnet (PM) shifting is adopted. To reduce cogging torque, both the original and newly introduced lower harmonics of cogging torque should be reduced. In this paper, the effect of PM shifting on Bnz(B nz is the Fourier coefficient of the square of magnetic flux density...
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