Übersetzung für "Lower pole" in Deutsch

The magnetic resistance can be generated by a reduction in the cross-section of the lower pole plate.

Connect the tip of the screw with the negative pole (lower side) of the battery.

The two kidneys are most often bound together at the lower pole.

Use of the BiClamp enables a ligature-free ablation of the upper and lower pole vessels.

In this way the moving coil 4a is actively braked and is thus prevented from striking against the lower pole plate.

The soft iron ring 12a is here set into a suitable recess 13 in the lower pole plate 8.

In this way an impact of the moving coil against the inner or lower pole plate is prevented.

Also located inside the lower pole shell 2 is the cover cap 12 for the slot motor side plates.

The plunger rod is mounted in an axial bore in the lower pole shoe, whereby it can slide axially.

Magnetised iron is the metal of Libra, because it forms the lower pole of the magnet.

Autologous breast lifting is possible if you have sagging breasts with a prominent lower pole.

The upper pole is the brain and the lower pole is the deeper end of the spinal cord.

Thus two poles are born, with Aries as the upper and Libra as the lower pole.

BACKGROUND OF THE INVENTION The invention concerns an annular gap magnet system, particularly for low frequency loudspeakers (Woofers) in which a moving coil moves with a large stroke in the working air gap, with a cylindrical pole core of soft iron and an annular permanent magnet arranged at a distance from the pole core between an outer (herein called the upper) pole plate limiting the working air gap and an inner (herein called the lower) pole plate.

This has the result that the moving coil after having left the main magnetic field in the working air gap of the magnet system is drawn further inward by the internal stray field below the working air gap and, in particular, if overloaded it strikes against the lower pole plate.

In order to prevent such an impact of the moving coil against the lower pole plate it has been necessary hitherto to make a compromise in that the membrane and the moving coil are suspended stiffer than is desirable from the point of view of the acoustic quality of the loudspeaker.

This object is solved according to the invention in that in or on the inner, that is the lower, pole plate, at a distance from the outer, that is the upper, pole plate which is at least equal to the thickness of the upper pole plate, there is provided a braking air gap surrounding the pole core in its lower region as an axial extension of the working air gap, and that, in the region of the lower end of the braking air gap in the lower pole plate there is provided a magnetic resistance of a magnitude such that the magnetic flux through the braking air gap and the stray flux above the braking air gap, both of which are directed oppositely to the magnetic flux in the working air gap and also oppositely to the stray flux below the working air gap, are at least equal in sum to the oppositely directed stray flux below the working air gap.

By means of said magnetic flux through the braking air gap and the stray flux above the braking air gap, both of which are directed oppositely to the magnetic flux in the working air gap and to the internal stray field in the region surrounding the working air gap, there is produced a magnetic counter force, of well defined magnitude, which prevents impact of the moving coil against the lower pole plate even when the loudspeaker is overloaded and, in particular, independent of the softness of the membrane suspension.

It is, however, also possible to provide a connecting element without or with low magnetic conductivity between the lower pole plate and the pole core.

For the purpose of easy tuning of the loud speaker to any given desired acoustic quality and/or for reasons of economy, there may be provided adjacent the lower pole plate a soft iron ring which limits the braking air gap at least over a part of its axial length and which is in magnetically conducting connection with the internal circumference of the permanent magnet ring.

The annular gap magnet system 1 has a cylindrical pole core 5 of soft iron and an annular permanent magnet 6 with a thickness D which is fixed concentric with the pole core 5 between an annular upper pole plate 7 of thickness d2 and a lower pole plate 8.

In or on the lower pole plate 8 there is provided a cylindrical annular braking air gap 9 with depth d3 which surrounds the pole core 5 as an axial extension of the working air gap and into which the moving coil can dip at its lower end.

To the right of the centre line a modification is illustrated in which the lower pole plate is formed by a ring 8b and a plate 8c.

Thus it forms with its internal surface 6d, the external surface of the braking air gap 9 which extends as an annular cavity 9b into the lower pole plate 8 so as to determine the reduction in cross-section which determines the magnetic resistance.