Magnetic coupling assembly, comprising: a drive shaft rotatable on a drive axis; a driven shaft rotatable on the drive axis; a drive magnet assembly coupled to the drive shaft and rotatable therewith, the drive magnet assembly comprising a first balancing magnet positioned on the drive axis, and a drive magnet coaxially positioned with the first balancing magnet; and a driven magnet assembly coupled to the driven shaft and rotatable therewith, the driven magnet assembly comprising a second balancing magnet disposed on the drive axis, and a driven magnet coaxially positioned with the second balancing magnet, wherein: the drive magnet assembly is spaced from the driven magnet assembly by an axial gap, with the first balancing magnet facing the second balancing magnet across the axial gap, and the drive magnet facing the driven magnet across the axial gap; the drive magnet and the driven magnet are configured to drive rotation of the driven magnet in response to rotation of the drive magnet, and to generate a tangential drive force and an axial attractive force between the drive magnet and the driven magnet; and the first balancing magnet and the second balancing magnet are configured to generate an axial repulsive force between the first balancing magnet and the second balancing magnet that counterbalances the axial attractive force, wherein the magnetic coupling assembly further comprises a structural boundary disposed in the axial gap between the drive magnet assembly and the driven magnet assembly, characterized in that the structural boundary is composed of an electrically insulating material. a drive shaft rotatable on a drive axis; a driven shaft rotatable on the drive axis; a drive magnet assembly coupled to the drive shaft and rotatable therewith, the drive magnet assembly comprising a first balancing magnet positioned on the drive axis, and a drive magnet coaxially positioned with the first balancing magnet; and a driven magnet assembly coupled to the driven shaft and rotatable therewith, the driven magnet assembly comprising a second balancing magnet disposed on the drive axis, and a driven magnet coaxially positioned with the second balancing magnet, wherein: the drive magnet assembly is spaced from the driven magnet assembly by an axial gap, with the first balancing magnet facing the second balancing magnet across the axial gap, and the drive magnet facing the driven magnet across the axial gap; the drive magnet and the driven magnet are configured to drive rotation of the driven magnet in response to rotation of the drive magnet, and to generate a tangential drive force and an axial attractive force between the drive magnet and the driven magnet; and the first balancing magnet and the second balancing magnet are configured to generate an axial repulsive force between the first balancing magnet and the second balancing magnet that counterbalances the axial attractive force, wherein the magnetic coupling assembly further comprises a structural boundary disposed in the axial gap between the drive magnet assembly and the driven magnet assembly, characterized in that the structural boundary is composed of an electrically insulating material. the drive magnet assembly is spaced from the driven magnet assembly by an axial gap, with the first balancing magnet facing the second balancing magnet across the axial gap, and the drive magnet facing the driven magnet across the axial gap; the drive magnet and the driven magnet are configured to drive rotation of the driven magnet in response to rotation of the drive magnet, and to generate a tangential drive force and an axial attractive force between the drive magnet and the driven magnet; and the first balancing magnet and the second balancing magnet are configured to generate an axial repulsive force between the first balancing magnet and the second balancing magnet that counterbalances the axial attractive force, wherein the magnetic coupling assembly further comprises a structural boundary disposed in the axial gap between the drive magnet assembly and the driven magnet assembly, characterized in that the structural boundary is composed of an electrically insulating material.