Patent ID: 9172291
Filing Date: 2015-10-27
Classification: H02K

Abstract:
1. A vertical actuator drive having gravity compensation, comprising: a first subassembly; and a second subassembly; wherein one of the subassemblies is arranged as a stationary subassembly and the other of the subassemblies is arranged as a movable subassembly, movable in a vertical direction; and wherein the first subassembly includes a first magnetic yoke provided with a coil, and the second subassembly includes a second magnetic yoke provided with at least one magnet oriented toward the coil, a horizontal distance between the first magnetic yoke and second magnetic yoke in a region of the at least one magnet is variable in the vertical direction so that in an operating range of the actuator drive a reluctance force between the first subassembly and the second subassembly acts counter to a weight force of the movable subassembly; and wherein the coil envelopes the first yoke; wherein the first magnetic yoke has at least one of: (i) a conical recess; or (ii) a conical projection on a top side face towards the second magnetic yoke.