Electrodynamic drive

Abstract

The invention relates to a highly dynamic electromagnetic drive of the Thomson coil type with a soft-magnetic frame, comprising a first exciter coil (30), the winding height of which is greater than the length thereof and which is therefore flat; a soft-magnetic frame (10) in which the first exciter coil (30) is arranged and supported thereon and which forms an open magnetic circuit in the manner of a cup magnet, which has an outer region (11), a bottom (12) and an inner region (13) and is open at the end, wherein the first exciter coil at least partially encloses the inner part (13) of the frame; a squirrel cage rotor (40) which is preferably hollow-cylindrical, at least on the side facing the first exciter coil (30), is mounted such that it can move along a shaft, passes into the end opening in the frame (10) when in the stroke starting position and in the process at least partially encloses the inner part (13) of the frame. The frame (10) is formed entirely or mainly from a soft-magnetic composite material or one or more lamination stacks, said composite material having a saturation flux density of at least 1.5 T and an effective specific electrical conductivity of at most 10<6> S / m. The first exciter coil (30) and / or the frame (10) have at least one means for relieving tensile load, in particular in the form of an enclosure, to absorb at least some of the radial forces arising perpendicular to the movement direction at the first exciter coil (30) during an actuation process. The Lorentz force acting on the squirrel cage rotor is used to perform work.

Description

Background technique Pyrotechnic or pneumatic devices are used in different technical fields, since electromagnetic drives are not suitable for these fields. Examples of exclusion criteria for electric drives include, inter alia: - Application-related insufficient force and / or work capacity per drive mass or drive volume, - In the case of highly dynamic electrical direct drives, such as so-called Thomson coils and electromagnetic guns, there is also a high wiring complexity and / or a too low efficiency. This is illustrated with different examples: - a nail punching device, and here in particular a hand-held nail punching device, in which, for example, a piston is accelerated due to the combustion of a combustible gas mixture or a booster charge in order to drive a nail, - disturbance arc protection equipment in which a pyrotechnically driven metal bolt penetrates an insulating plate and causes a short circuit in order to extract energy from a disturbance arc, - A short...

AI Technical Summary

Problems solved by technology

- in the case of highly dynamic electrical direct drives, such as so-called Thomson coils and electromagnetic guns, there is also a high wiring effort and / or a too low efficiency

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