Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1988-01-13
1989-05-16
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Linear
310 14, 318135, H02K 4103
Patent
active
048312908
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a linear unit. Units are suitable, for example, for seizing an object and displacing it with the aid of electromagnetic actuating drives in one or more predetermined directions by certain amounts, entered in advance. Since the displacement speeds are comparatively high, it is necessary to keep the mass of the moving tool support of the unit and of the rotor of the linear motor connected to it as small as possible, in order that their movements can be damped promptly and effectively. Thus, it may be ensured that the support is also actually stopped as well at the point at which the standstill is required. Therefore, materials or material combinations which meet the requirement for lowest possible mass, great rigidity and wear resistance are used for production of the tool supports. Hollow profiles of aluminium or a composite of aluminum and steel, produced in the extrusion process, have proved particularly suitable, the basic body consisting of aluminium and the bearing surfaces of steel strips.
Electromagnetically driven linear motors with a gear rack of magnetically conductive material as motor rotor and a magnetizable motor stator are known in large number. Such a motor is described, for example, in German Offenlegungsschrift No. 2,247,509. The moving element of the motor consists of a solid, magnetic bar, which may have round or rectangular cross-section and is provided on its outside surface with one or more rows of teeth of the same pitch. Opposite each row of teeth lie several pole masses, which are provided with windings and at the same time each have a toothing. The mutually facing surfaces of the rows of teeth lie in two parallel planes with an intermediate space, which forms the pole gap. The bar forming the moving element may, on account of the principle, be made only so thick that the magnetic lines of flux are able to penetrate it without difficulties.
It would be obvious simply to fit the known or a similarly designed linear motor to the holder of the tool support and connect its gear rack to the tool support in such a way that the gear rack is the driving element and the tool support is the driven element. Such a solution would be elaborate inasmuch as both the gear rack and the tool support require a precision bearing of their own and the linear unit as a whole would have a large volume.
SUMMARY OF THE INVENTION
The linear unit according to the invention is formed such that a separately borne gear rack as a motor rotor for the drive of the tool support is not necessary. The tool support at the same time forms the gear rack of the linear motor, so that the latter can be integrated completely in the assembly consisting of tool support and holder. This makes possible a partssaving and space-saving design of the linear unit. It is still possible as before to use profiles and materials which have a low mass and a great rigidity and wear resistance for the tool support.
In the case of tool supports which are produced from a non-magnetic material, it is advantageous to design the toothing as webs running perpendicular to the direction of movement of the tool support in a strip of magnetically conductive material which is fixed, preferably adhesively attached on the outer periphery of the tool support. If, on the other hand, the tool support consists of a magnetic material, it is expedient to form the toothing by milling or sawing of the support in transverse direction. In order to increase the motor power with the same overall length, it is further provided that the tool support has several toothings distributed around its periphery, to each of which toothings a motor stator, accommodated in the holder of the support, is assigned.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are represented in the drawing and explained in more detail in the following description. FIG. 1 shows a linear unit for handling equipment in cross-section, FIG. 2 shows a part of the tool support with a gear rack of the linear motor fitt
REFERENCES:
patent: 3954037 (1976-05-01), Rios
patent: 4152570 (1979-05-01), Inoue et al.
patent: 4286180 (1981-08-01), Langley
patent: 4377761 (1983-03-01), Staciokas
patent: 4661730 (1987-04-01), Maruyama et al.
Clauss Heinz
Drexel Peter
Gosdowski Gerhard
Kettner Andreas
Leisner Ernst
Jones Judson H.
Robert & Bosch GmbH
Salce Patrick R.
Striker Michael J.
LandOfFree
Linear unit for handling equipment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linear unit for handling equipment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear unit for handling equipment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2325253