US 4,381,466 AGranted

Magnetic central rotary coupling

AssigneeSiemens Aktiengesellschaft

InventorWerner Laenens

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Abstract

The invention relates to a magnetic rotary coupling with outer magnetic devices on a rotary outer coupling member and an inner magnetic device on a rotary inner coupling member. The inner magnetic device includes permanent magnets spaced radially out from the axis, each such magnet having a magnetic axis perpendicular to a radius from the axis. The outer devices include permanent magnets having magnetic axes approximately radial with respect to the axis. Pole faces of the outer member are aligned with faces of opposite polarity of the inner member magnets to minimize the lengths of the flux loops linking the inner and outer magnets. A high-permeability shield bridges the outer poles of the outer member to reduce the total reluctance further, thereby maximizing the torque that can be transmitted between the inner and outer members.

Claims6

Dependent claims

Magnetic central rotary coupling with

(a) an inner coupling half having disposed thereon an inner magnetic device with its longitudinal axis transverse to the axis of rotation, said inner magnetic device including two pairs of magnet poles, one pair at each longitudinal end thereof;
and
(b) an outer coupling half having first and second outer magnetic devices disposed thereon symmetrical to the longitudinal axis of the inner magnetic device, the magnet poles of said outer magnetic device adjacent to those of the inner magnetic device and aligned at an angle of approximately 30.degree. to the longitudinal axis of the inner magnetic device, the improvement comprising said inner and first and second outer magnetic devices each containing two rod shaped permanent magnets, the rod shaped permanent magnets of the outer magnetic devices being situated at the locations of the magnet poles of said devices and the rod shaped permanent magnets of said inner magnetic device situated so that their magnet poles are aligned at an angle of 90.degree. to the longitudinal axis.

Dependencies are inferred from the claim text.