Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-03-07
1997-12-16
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, 310216, 310254, 310258, H02K 106
Patent
active
056989253
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a slotted wound stator for an electrical rotating machine and a method for manufacturing such a stator. It also concerns a machine comprising such a stator.
BACKGROUND OF THE INVENTION
In many electrical rotating machines, motors or current generators, the stator has a cylindrical outer shape, this stator consisting of disk-shaped plates piled up face-to-face and butt-jointed. This structure has certain disadvantages. First of all, since the plates are generally cut in a roll or a rectangular metal plate, the cutting of circular plates generates a significant loss of material. Secondly, this type of stator is difficult to cool externally since the exchange surface, consisting of the outer periphery of the stator, i.e. the edges of the plates placed face-to-face and butt-jointed, is very small with respect to the mass to be cooled.
Stator structures have been conceived in an attempt to eliminate these disadvantages. In general, each plate displays an angular displacement from the following adjacent plate, with respect to the axis of the stator, of a constant angle (.alpha.) equal to a multiple of the angle corresponding to the pitch of the slots, each plate substantially having the shape of a regular polygon, more particularly of a square, each corner of which is truncated according to a circular contour, or approximately a circular contour, symmetrical with respect to the bisector of said corner, identical for all corners, and corresponding to the sector of a circle whose angle at the center is substantially equal to or greater than said angle (.alpha.), the distance with respect to the axis of the stator and the shape of said contour being determined according to the angle (.alpha.) so that, projected onto a plane perpendicular to the axis of the stator, the contour of a plate substantially prolongs the contour of a successive adjacent plate or is partially superposed on said contour.
Such structures make it possible to reduce the losses in magnetic material when cutting the plates, to increase the equivalent magnetic diameter of the pack of magnetic plates, and to improve the cooling of the stator by forcing the air to pass transversally through the spaces provided between the corners, spaced apart from one another, of the plates having identical positions with respect to the axis of the stator.
Despite these significant advantages, such structures are not used industrially, mainly due to the inability to connect the plates to one another in a simple and reliable manner so as to be able to handle the pack of plates thus formed with full safety during all of the assembly phases of the stator and then of the motor.
Indeed, the magnetic plates are very thin, and their various corners, shifted with respect to another, do not support and protect one another: they are therefore exposed and can be very easily deformed, distorted, damaged, upon the slightest shock or during handling.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the disadvantages of known stator structures and to provide for a structure of the type previously mentioned in which the shifted plates are connected to one another in a simple and reliable manner, as well as a method for manufacturing such a stator, and an electrical rotating machine including such a stator.
According to the invention, the stator of the type previously mentioned is characterized in that at least one of every two truncated corners of each plate is connected to the corresponding corner of each of the two adjacent plates by at least one weld point located in a place where the two contours are prolonged or superposed, the weld points being located in predetermined and cyclically reproducible respective angular positions with respect to the axis of the stator and being distributed in a substantially regular fashion about the axis so that the weld points are aligned along lines of weld points substantially parallel to the axis of the stator.
At least one of every two and preferably ea
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Moteurs Leroy-Somer
Nguyen Tran Ngoc
Stephan Steven L.
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