Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1996-10-02
1999-09-14
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Linear
310 86, 310156, H02K 4102, H02K 117, H02K 118
Patent
active
059527420
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a synchronous linear motor with a primary part provided with a winding and a secondary part including an elongated ferromagnetic support plate for bonded attachment of permanent magnets defining a parallel gap therebetween.
There exists a problem with synchronous linear motors of this type in that the permanent magnets which have to be arranged in alternating north-south polarity, shift during the bonding process as a result of the mutually effecting magnetic forces and cannot be secured at the intended locations. In order to obviate these drawbacks, the magnets are usually affixed to the support plate in their non-magnetized state and are magnetized only after they have been mounted. However, a magnetizing device required for magnetizing the affixed magnets is very complicated.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to attach completely magnetized permanent magnets to the secondary part and the support plate in a simple and highly precise manner.
This object of the invention is achieved in that spacers which correspond to the pole pitch of the synchronous linear motor are arranged between the permanent magnets.
The spacers may be formed by a pair of spacer pins arranged in side-by-ide relationship on the support plate. Since the permanent magnets, which are manufactured by a sintering process, are very brittle, it may be advantageous to substitute the spacer pins, which essentially exert a point load, with crossbars upon which the permanent magnets bear against along their entire length.
In the same fashion, the permanent magnets can be positioned via lateral positioning pins or positioning strips extending along their sides.
In a preferred embodiment, the crossbars and the lateral positioning strips can be united to a single-piece, ladder-like positioning structure.
In accordance with a suitable embodiment of the invention, the spacers are made by individual frames which surround one or more permanent magnets. These individual frames are preferably provided with centering devices, for example centering wedge-shaped protrusions and recesses so that as a result of the attractive force between pairs of neighboring permanent magnets, the individual frames are pressed together in a self-centering fashion and are thus in their entirety joined together in an exactly lined-up and stable ladder structure. When the individual frames are manufactured from injection molded plastic parts, the resulting building blocks are inexpensive and have the desired non-magnetic properties.
Since, on the one hand, the permanent magnets are made of very brittle and corrodible material and, on the other hand, they are covered by the primary part only to a small extent, it is necessary to protect the open regions of the permanent magnets. For this purpose, it is advantageous to protect the permanent magnets with a cover plate formed with lateral folds which surround the permanent magnets directly at their lateral faces or surround the lateral positioning elements thereof, e.g. the lateral strips, the lateral positioning pins or the individual frames. The cover plate is connected to the secondary part as a result of the spring action of the folds and forms a reliable protection against detrimental mechanical and corrosive conditions.
Exemplified embodiments of the invention will be described hereinafter with reference to the drawing, in which:
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of the components of a secondary part;
FIG. 2 shows the view of the secondary part according to FIG. 1 with lateral positioning strips,
FIG. 3 is an illustration of an individual frame,
FIG. 4 is an illustration of several individual frames affixed to the support plate of the secondary part,
FIG. 5 is a cross sectional view of a secondary part with cover plate according to FIG. 1, and
FIG. 6 is a cross sectional view of a secondary part according to FIG.4.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 shows the support plate 1 of the s
REFERENCES:
patent: 2463936 (1949-03-01), Allison
patent: 3518593 (1970-06-01), Hall
patent: 3828212 (1974-08-01), Harkness et al.
patent: 4587450 (1986-05-01), Ozaki
patent: 4803387 (1989-02-01), Seider
patent: 4859974 (1989-08-01), Kliman et al.
patent: 5450050 (1995-09-01), Ban et al.
Rosner Peter
Stoiber Dietmar
Feiereisen Henry M.
InTraSys GmbH
Krauss-Maffei AG
Ramirez Nestor
Tamai K. Eizo
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