Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1995-05-03
1997-08-26
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
H02K 4100
Patent
active
056613504
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an electromechanical converter device for producing a motion following any trajectory, in particular a linear trajectory.
Electric jacks and other linear actuators, in particular hybrids, are known, i.e. the magnetic flux of which is produced jointly by excitation windings and permanent magnets. These actuators contain complex stators with successive magnetic pieces and electrical windings along their entire length. Consequently, if the actuator is to have a significant useful movement, the cost of the stator becomes prohibitive.
The U.S. Pat. No. 4,963,809 describes a linear stepper actuator device designed to move horizontally a vertically suspended element, in particular a curtain. This device includes a guide tube in which a mobile assembly slides and which contains a scale constituted by a magnetic plate containing a row of teeth or holes distributed according to a pre-determined pitch.
This actuator device has the drawback of not employing a single force surface, which necessarily leads to very significant normal forces which must be countered by a consequent guide device. The possible compensation of these forces by symmetrization would involve a complete recast of the structure of this device due to the requirement to provide a slit for the passage of the carriage.
The Japanese Patent JP-A-61042270 describes a linear stepper motor including a stator with a cylindrical shape containing on its internal surface a series of annular teeth forming stator poles, and a mobile assembly sliding on a central shaft and containing two magnetic yokes coupled by a central permanent magnet and each provided with a winding.
The Japanese Patent JP-A-61295858 describes a linear stepper motor containing only a single row of stator poles arranged on the internal surface of a cylindrical stator.
The linear motors disclosed in these two Japanese Patents employ stator structures which are notched internally and which are relatively difficult to produce.
The aim of the present invention is to propose an electromechanical converter device which is simple and economical to produce.
It is desirable, for example, that the electromechanical converter device be sufficiently inexpensive to be usable in applications in buildings, such as the motorized operation of sliding doors and sliding shutters.
According to the invention, the electromechanical converter device including a stator made of magnetic material containing magnetic stator poles, and a mobile assembly containing at least one excitation winding and an armature defining the movable magnetic poles which in the positions of conjunction are opposite the magnetic stator poles, this stator being constituted by a guide tube containing recesses between which the stator poles are defined, and the mobile assembly being mounted in a sliding way in the guide tube and guided in a sliding manner by the guide tube, is characterized in that the magnetic stator poles are arranged in at least two rows of distinct stator poles, the armature comprises at least one permanent magnet placed between two pole pieces each having at least two movable poles each running in front of one of said rows of stator poles, and in that the stator and movable poles are arranged in such a way that in the first of two positions of conjunction of the armature, two first movable poles each belonging to one of the respective pole pieces coincide with two stator poles belonging to two rows of different stator poles while the two other movable poles are offset relative to the stator poles, whereas in the second of the two positions of conjunction, said two other movable poles coincide in turn with the movable stator poles, the two first movable poles being in turn offset relative to the stator poles.
Thus, according to the invention, at least one essential part of the magnetic and electrical functions which generate the motive force is transferred onto the mobile assembly such that the stator becomes a very simple item having the shape of a tube which can be split or closed. Moreo
REFERENCES:
patent: 4837467 (1989-06-01), Newman
patent: 4945268 (1990-07-01), Nihei et al.
patent: 4963809 (1990-10-01), Shingu et al.
patent: 5302873 (1994-04-01), Takei
Lecrivain Michel
Lucidarme Jean
Multon Bernard
Prevond Laurent
Ecole Normale Superieure de Cachan (Lesir)
Jones Judson H.
Stephan Steven L.
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