Linear drive device provided with an armature body having a magnet carrier

Inactive Publication Date: 2010-03-18
BSH BOSCH & SIEMENS HAUSGERAETE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]It is thus an object of the present invention to construct the linear drive device provided with the features specified initially such that the aforementioned induced braking force is reduced.
[0011]It is particularly advantageous if each magnet part with respect to the associated yoke body and / or the excitation winding are covered by a magnet cover made of a ferromagnetic sheet or a corresponding layer, the magnet covers being spaced axially apart by means of a spacing joint. These ferromagnetic covers are used firstly for secure fixing of the magnet parts in or on the magnetic carrier. Secondly, they reduce the effective magnetic air gap, increase the field of the excitation winding(s) and thus the driving force.
[0012]In this case, the ferromagnetic magnet covers can advantageously be spaced apart from one another by a distance a>2 s, where s is the distance from the surface to the pole surfaces of the yoke body. A magnetic short circuit can thus be avoided between the neighbouring magnet parts.

Problems solved by technology

The air gap between the pole surfaces of such a yoke body and the surface of the permanent magnets represents an additional resistance in the magnet circuit which reduces the magnetic field strength produced by the excitation winding in the air gap and thus correspondingly reduces the driving force.

Method used

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  • Linear drive device provided with an armature body having a magnet carrier
  • Linear drive device provided with an armature body having a magnet carrier
  • Linear drive device provided with an armature body having a magnet carrier

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Embodiment Construction

[0023]In the linear drive device according to an exemplary embodiment of the invention shown in FIG. 1, embodiments known per se such as those provided for linear compressors are assumed. Essentially only an upper and a lower part 2a or 2b of such a drive device 2 can be seen from the oblique view in the figure, these parts being embodied symmetrically with respect to a plane of symmetry SE. The drive device 2 comprises two symmetrically opposed excitation coils 4a and 4b, each having at least one magnetic-flux-carrying yoke body 5a or 5b. The yoke bodies, for example, have the known E-shape. Located in a central channel-like or slit-like opening 7 between these yoke bodies or their pole surfaces Fp is a magnetic armature or armature body 8 comprising two permanent magnets 9a and 9b, for example. Their anti-parallel-directed magnetisations M perpendicular to the plane of symmetry are indicated by the arrowed lines. The armature body 8, designated as “armature carriage” and described...

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Abstract

A linear drive device includes an excitation winding producing a variable magnetic field and including an associated magnetic-flux-carrying yoke body having pole surfaces, and an armature body including a magnet carrier having at least two permanent magnet parts and an axial oscillation movement being transferable to the at least two permanent magnet parts by the variable magnetic field of the excitation winding. The magnet carrier includes an electrically insulating material at least partially extending into the magnetic field area defined by the pole surfaces of the yoke body and the excitation winding.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS[0001]This application is a Divisional, under 35 U.S.C. §121, of U.S. application Ser. No. 10 / 591,082, filed Aug. 29, 2006, which is a U.S. national stage application of PCT / EP2005 / 050956 filed Mar. 3, 2005, which designated the United States; this application also claims the priority, under 35 U.S.C. §119, of German patent application No. 10 2004 010 404.2 filed Mar. 3, 2004; the prior applications are herewith incorporated by reference in their entirety.BACKGROUND OF THE INVENTION[0002]The invention relates to a linear drive device including at least one excitation winding for producing a variable magnetic field and provided with at least one associated magnetic-flux-carrying yoke body as well as an armature body which includes a magnet carrier provided with at least two permanent magnet parts and to which an axial oscillation movement can be transferred by the magnetic field of the excitation winding. A corresponding drive device is deduced ...

Claims

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Application Information

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IPC IPC(8): H02K35/00H02K1/34H02K33/16
CPCH02K33/16H02K1/28H02K33/00
InventorRIES, GUNTER
OwnerBSH BOSCH & SIEMENS HAUSGERAETE GMBH