Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1994-10-17
1997-02-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
H02K 41025
Patent
active
056062052
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an induction module for an asynchronous linear electric motor and to its method of manufacture.
A linear electric motor comprises a fixed or mobile inductor comprising an elongated rectilinear magnetic circuit, of substantially parallelepipedic general shape, in which are cut out a longitudinal succession of recesses separated from one another by teeth or polar pieces. In the recesses are housed conducting windings supplied by sinusoidal polyphased currents producing a sliding magnetic field. The linear motor also comprises an armature intended to ensure the return of the magnetic flux produced, this armature, mobile or fixed, delimiting a narrow air gap with the inductor, via support and guiding means interposed between the two elements. Under the effect of the Laplace force, there is produced a rectilinear movement of the armature if the inductor is maintained fixed or, inversely, of the inductor if the armature is mounted in fixed manner.
As described in Patent CH-A-474 893, a linear induction motor is already known, comprising an elongated box, of U-shaped transverse section, surrounding the magnetic circuit of the inductor and its windings. The space included between the box, the magnetic circuit and the windings is filled with an insulating mixture. As described in Patent DD-A-95 621, a sleeve for protecting a linear motor is also known, this sleeve also being able to constitute a casting mould and a stiffening element for an envelope of insulating synthetic resin cast around the magnetic circuit and its windings.
The present invention relates to improvements made to the inductors of the known linear motors, with a view to facilitating manufacture thereof and to lowering their cost price.
To that end, this induction module for an asynchronous linear electric motor comprising an outer protective shell of parallelepipedic form, constituted by a rectangular horizontal bottom, two opposite vertical and longitudinal walls and two opposite vertical and transverse walls, a laminated magnetic circuit constituted by a bar, of generally parallelepipedic shape, of smaller length and smaller width than the inner length and width of the protective shell, extending along the longitudinal axis of the outer protective shell, this bar presenting, in its upper part, a succession of transverse recesses regularly spaced from one another in the longitudinal direction, opening out in the upper face and in the two vertical and longitudinal faces of the bar, delimiting therebetween teeth constituting polar pieces, inductor windings housed in the recesses of the magnetic bar and an insulating matter filling the space left free inside the protective shell, between the latter and the magnetic bar and the windings that it supports, is characterized in that the height of the magnetic bar is greater than the height of the longitudinal and transverse walls of the protective shell, so that, after the insulating matter has been cast, the plane polar faces of the teeth of the magnetic bar emerge from the block of solidified insulating matter.
The invention also relates to a method for manufacturing induction modules for an asynchronous linear electric motor, characterized in that, to form the bar constituting the magnetic circuit, there is formed in the same band of magnetic sheet unwound from a reel, along one of its edges, a succession of pairs of recesses, by causing the sheet to pass through a punching station equipped with two identical punches, and after punching, there are cut out in the punched sheet, individual sections of sheet, having the desired width, each presenting a number of recesses equal to four or to a multiple of four, for making a magnetic bar for a monophase motor, or individual sections of sheet comprising a number of recesses equal to six or to a multiple of six, for making a magnetic bar for a three-phase motor.
Various forms of embodiment of the present invention will be described hereinafter by way of non-limiting examples, with reference to the accompanying drawings, in wh
REFERENCES:
patent: 1929990 (1933-10-01), Rose
patent: 4171493 (1979-10-01), Brimer et al.
patent: 4620301 (1986-10-01), Koide
patent: 4704568 (1987-11-01), Beck et al.
Defontaine Bernard
Defontaine Jean-Claude
Jones Judson H.
Stephan Steven L.
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