The design of magnetic circuit and magnetic field finite element analysis of a double discs magnetorheological clutch

To obtain the magnetorheological clutch with excellent transmission properties, and decrease the influence of structural parameters on magnetic flux density in working gap, the magnetic circuit of clutch is designed and three-dimensional finite element method is used to analyzed the magnetic field of clutch, spatial distribution of magnetic flux density is obtained and the influence rules of spatial parameters on magnetic flux density are discussed. The results indicate that spatial parameters including the diameter of side hole and the distance between side hole and axis have great influence on the local uniformity of magnetic flux density in working gap, however, the diameter of hole at the top of magnetic yoke has little effect on magnetic flux density. The ampere-turns of coil is the main factor that influences magnetic field in working gap when the structural parameters of clutch are determined, the magnetic flux density between disks changes nonlinearly with the ampere-turns of coil.