Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1995-06-26
1998-01-27
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
49360, H02K 4102, E05F 1518
Patent
active
057125163
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a stator element for linear-electrical-driving of a body reciprocally slidable over a limited length in a straight or curved line, such as a door, gate or carriage, provided with a magnet or magnetizable counter element.
Background of the Invention
Linear drive techniques are generally known and serve mainly for the driving of a body along a rail, such as trains and the like. The invention relates particularly to linear driving of bodies which are moved reciprocally over a limited length, for instance a sliding door. This is associated with the problem that the control of the linear drive motor must be such that the movement of the body proceeds smoothly and the end positions are accurately defined. Furthermore, the drive must be safe and easy to operate.
SUMMARY OF THE INVENTION
The stator element according to the invention is distinguished by an elongate holder, a number of rod-like, mutually parallel and adjacent carriers fixed transversely onto the holder and a number of windings each of which is trained in each case round at least one carrier along a side of the holder, which winding is connected onto a controlled voltage source.
Due to the controlled voltage source each winding in the stator element can be actuated separately and therefore the correct magnetic field generated in order to move the magnetizable counter element and the body connected thereto, wherein the control is such that overlapping magnetic fields can be generated to obtain a smooth movement. The end positions are accurately defined by opposite actuation of the magnetic fields so that the movement is braked at the ends.
A more precise control of the movement can be obtained according to the invention in that each winding is trained in each case round two carriers and two separately powered windings overlap one another. It is hereby possible to obtain overlapping magnetic fields.
The invention further relates to a sliding door consisting of a door panel, a series or permanent magnets arranged on the top edge of the panel and a guide strip of magnet-sensitive material arranged on the upper side of the door recess, this such that the door panel is suspended from the recess by means of the magnet action and is slidable reciprocally along the strip, which according to the invention is provided with a stator element as described above.
Above mentioned and other features of the invention will be elucidated hereinbelow with reference to an embodiment in the form of a sliding door.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are described below with reference to the accompanying drawings, which are briefly described below.
FIG. 1 shows a perspective view of a sliding door which is suspended by means of magnets from the lintel of a frame and which can be moved reciprocally by means of a linear drive according to the invention,
FIG. 2 is a perspective view of a detail of the stator element with the upper part of the door of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
This disclosure of the invention is submitted in furtherance of the constitutional purposes of the U.S. Patent Laws "to promote the progress of science and useful arts" (Article 1, Section 8).
Designated in the drawings with the numeral 1 is a door panel which is for instance suspended at the top from a lintel 2 of a frame 3 which is placed in a random building, outer wall etc. The frame is embodied partly as a housing 4 in which the door panel can be received. The door is movable reciprocally in the direction of arrow P1.
Suspension of the door panel 1 can take place for instance by arranging a number, or series, of magnets or magnet-groups 10, the magnetic field strength of which is such that an attractive force is obtained to the guide plate 11 arranged on the underside of lintel 2. The attractive force is sufficient to lift the weight of door panel 1. Arranged at the ends of the magnet groups is a guide wheel 12 which runs in a guide 14 on the underside of strip 11. In order to en
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"Patent Abstracts of Japan", The Japanese Office Japanese Government--vol. 10, No. 164 (Jun. 11, 1986).
Jones Judson H.
Stator B.V.
Stephan Steven L.
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