Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1990-04-30
1991-11-19
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335257, 335261, 335262, 335270, 335271, 335279, 335281, H10F 300, H10F 708
Patent
active
050669800
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a solenoid plunger magnet and to its use as a print hammer in a print hammer device.
FIG. 1 shows a solenoid plunger magnet 5 as it is known from the early days of the magnetism art in the form of a blunt solenoid plunger 1 which is pulled against a flat counter-pole 2 of a yoke 3. The working air gap 4 of this solenoid plunger magnet 5 equals the length of travel of solenoid plunger 1. The result is a steeply rising tractive force curve which, particularly for long travel paths, becomes so weak at the beginning, that it is hardly possible anymore to utilize it. Furthermore, the solenoid plunger magnet 5 also has a second air gap 6, also called the loss air gap since it contributes nothing to the thrust of solenoid plunger 1. The high striking force of solenoid plunger 1 against counter-pole 2 also inevitably reduces its service life.
Therefore, the configuration of the air gaps so as to realize a maximum of performance and service life is very decisive. By appropriately designing the geometry of the plunger and of the counter-poles, it is possible to influence the characteristics over a broad range and thus to adapt them to the intended purpose. For this reason, the operating air gap is configured according to the desired lines of magnetic flux while the loss gap is configured in such a manner that it has the lowest possible magnetic resistance but does not generate forces which move in the direction toward solenoid plunger 1.
DE-OS 2,636,985 discloses a solenoid plunger system in which the second air ga is also utilized to generate magnetic forces. However, the configuration of the outer air gap disclosed there is not meaningful because it doubles the overall air gap length and thus results in a reduction of magnetic flux and a reduction of the magnetic forces in the first air gap, the working air gap.
SUMMARY OF THE INVENTION
It is the object of the invention to configure a solenoid plunger magnet in such a way that the inner air gap and the outer air gap both serve to generate forces without the overall air gap length being extended over that customary for a solenoid plunger magnet.
The solenoid plunger magnet according to the invention, with the same exterior dimensions and the same electrical data as the prior art magnets, realizes an increase in magnetic forces up to 200%. The conventional means for realizing the desired magnetic force characteristic remain fully available for the inner air gap.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantageous features of the invention will become apparent in the detailed description of the embodiments and the following drawings.
FIG. 1 a solenoid plunger magnet according to the prior art;
FIG. 2 the geometry of the plunger and the counter-pole at the inner air gap with external cone control;
FIG. 3 the geometry of the plunger and the counter-pole at the inner air gap with internal cone control;
FIG. 4 the geometry of the plunger and the counter-pole at the outer air gap with external cone control;
FIG. 5 the geometry of the plunger and the counter-pole at the outer air gap with internal cone control;
FIG. 6 the solenoid plunger magnet with internal cone control at the inner air gap and external cone control at the outer air gap;
FIG. 7 the magnetic flux lines at the outer air gap according to the prior art of FIG. 1;
FIG. 8 the magnetic flux lines in the outer air gap for a solenoid plunger magnet according to FIG. 6;
FIG. 9 force-travel curves for the solenoid plunger magnets according to FIGS. 1 and 6; and
FIG. 10 a solenoid plunger magnet with external cone control at the inner and outer air gap.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention will now be described in greater detail with reference to embodiments thereof. In order to optimize the geometry of the plunger and counter-pole for the purpose of generating greater magnetic forces, FIGS. 2 and 3 illustrate examples for the configuration of the inner air gap. In FIG. 2, the plunger 7 is cylindrical, with the yoke 8 having
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AEG Olympia Office GmbH
Barrera Ramon M.
Picard Leo P.
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