Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-05-24
1998-12-15
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
74 87, 209367, 366128, B01F 1100, H02K 714
Patent
active
058501100
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a motor-driven, unbalanced mass vibration generator in accordance with the introductory clause of Patent Claim 1.
As a rule, such unbalanced mass vibration generators are provided with electric motor driving means. They are also known as electric unbalanced motors because--in a way similar to the analogous expression "back-geared motors"--they are generally implemented as compact modular units, in the housing extensions of which the unbalanced masses are generally integrated like the gearset of a back-geared motor. They are also known as flange vibrators because the housing is generally provided with a mounting flange by means of which the compact modular unit can be mounted on the machine or apparatus which is to be placed into oscillating motions with the aid of the vibration generator.
Unbalanced mass vibration generators of the type under discussion here often work in a rotational speed range of up to 25 Hz. Often, it is also required that the working moment, or more specifically, the effective unbalanced mass, can be changed. For this purpose in particular, known unbalanced mass vibration generators exhibit, on each of the journals of a shaft which extends out beyond the motor housing, two-part or multiple-part unbalanced masses which can be locked at different angle of rotation positions relative to one another in order to be able to affect the resulting unbalanced masses in this way. If the two unbalanced masses are equal, they cancel each other out when they are at an angular position of 180.degree. relative to each other, so that no unbalance arises. If both of the masses are set at the same angular position, the maximum unbalance of the device results. In between, there is a large number of transitional positions possible. For the purpose of a simple structural design, the adjustability of the unbalanced masses with respect to each other is most often configured in such a way that the one part of the unbalanced mass is mounted in a fixed position on the associated journal of the shaft, and only the second part is made so that it can be rotated with respect to the first part, in conjunction with which the mutual locking, for example, between the two unbalanced mass parts, can take place. With adjustability of such a type, the angular placement of the resulting unbalance on the shaft changes with an adaptation of the unbalanced masses, so that in the case of drives with several vibration generators, for example, for directional and synchronized oscillations, the angle of rotation position has to be preset in the synchronization device again. This requires unnecessary effort. For the purpose of achieving as symmetrical a bearing load as possible, known vibration generators are usually provided with unbalanced masses, or more specifically, unbalanced mass pairs, at both ends of the drive motor. This configuration also has the advantage that by means of different unbalanced masses or different positions of the unbalanced masses at both ends, wobbling movements can also be generated.
Examples of the applications of the unbalanced mass vibration generators under consideration here are, for example, polishing machines and deburring devices, in which mechanical parts are processed in a vat, or vibrating screens. In a large number of these application instances, for the generation of oscillations in horizontal planes, the vibration generators are installed with a vertical axis orientation, and specifically, generally underneath the working part of the particular device in question. In an installed position of such a type, after the removal of a protective machine part, the upper unbalanced masses are relatively easily accessible, for example, for the purpose of an adjustment. In the case of the lower unbalanced masses, such accessibility often turns out to be very difficult. Structurally, the accessibility is made even more difficult as a result of the fact that, because of the arrangement of the unbalanced masses on both ends of the shaft, the vibration generators are relatively
REFERENCES:
patent: 3385253 (1968-05-01), Mathey
patent: 3919575 (1975-11-01), Weber et al.
patent: 5107155 (1992-04-01), Yamaguchi
patent: 5220846 (1993-06-01), Niklewski
patent: 5392898 (1995-02-01), Burgess et al.
Dougherty Thomas M.
Jones Judson H.
Netter GmbH
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