Investigation on the stall force of trans-rotary magnetic gear and its influence factors
ZHANG Hai
ZHENG Guo
ZHANG Xiaodong
WANG Nannan
KONG Xinling
Abstract：In view of problems that are the screw and nut in the trans-rotary magnetic gear (TRMG) has no direct mechanical contact and the motion transformation between rotation of screw and linear motion of nut achieves through magnetic coupling, the transmission principle, ratio and thrust force of TRMG were analyzed, and the relationships of ratio and thrust force to pole pitch, number of pole pair, pole width, and screw diameter were derived respectively.The constraint condition between pole width, number of pole pair, and screw diameter was established.The influences of pole pitch, airgap, thickness of pole and steel yoke both in screw and nut to stall force (maximum thrust force) were investigated by means of 3D FEM.The result shows that airgap has the greatest influence to stall force, and it almost decreases linear when airgap increases.When pole pitch increases, stall force changes in approximate parabolic relationship, and it gets the maximum value when pole pitch is 8 mm.The influence of thickness of poles both in screw and nut is similar, that is the larger the thickness of poles, the greater the stall force.When pole thicknesses is ≤5 mm, the stall force changes fast, and when it exceeds 5 mm, stall force changes tended to be gentle.The thickness of steel yokes in both screw and nut has no influence to stall force.
Keywords：trans rotary magnetic gearstall forcepole pitchair gap
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 835-840 )