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Rotary electric machine stator having individual removable coils
| Details |
Inventors: Eydelie, Andre; Augier, Phillippe; Guillot, Jean-Marie;
Assignee: Moteurs Leroy-Somer (Angouleme, FR)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Mohandosi; Iraj A
Attorney, Agent or Firm: Oliff & Berridge PLC
The invention relates to a stator for a rotary electric machine. The stator comprising: a stator magnetic circuit having teeth and individual coils each engaged on a tooth, each coil including connection ends formed by respective flat bundles of stripped wires curved to form respective hook shapes, the connection ends being soldered to locally stripped portions of sheathed electric cables. |
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DETAILED DESCRIPTION In particular, the invention makes it easier to manufacture stators with windings on teeth, i.
e.
in which each tooth constitutes the core of a winding.
In a stator with windings on teeth, the number of teeth n.
sub.
teeth is preferably a function of the number of pairs of poles n.
sub.
pairs and the number of phases n.
sub.
phases in compliance with the relationship n.
sub.
teeth =n.
sub.
pairs *n.
sub.
phases.
The invention achieves this by means of a novel rotary electric machine stator comprising a stator magnetic circuit having teeth and individual coils each engaged on a tooth, each coil including connection ends formed by respective flat bundles of stripped wires curved to form respective hook shapes, said connection ends being soldered to locally stripped portions of sheathed electric cables.
The use of individual coils as defined above, in combination with sheathed electric cables, makes the machine easier to build and maintain.
In particular, a coil can easily be replaced without having to return the machine to the manufacturer, thereby making it possible to reduce the period of time in which the installation associated with the machine is out of service.
The above-mentioned hooks can be directed towards the midplane of the coil perpendicular to the winding axis of the coil, thereby enabling the machine to be more compact.
In a particular embodiment, each tooth presents two substantially plane and non-parallel opposite faces which converge at an angle towards the rotor, and each coil presents an inside section having two opposite faces forming an angle that is substantially equal to that of the teeth, in such a manner as to be able to be wedged thereon.
This clamping effect is particularly useful in contributing to ensuring that a pre-impregnated replacement coil does not move once it has been mounted on the stator, without it being necessary to reimpregnate the entire stator in an insulating resin.
Such a clamping effect is not possible with the machine described in patent application EP-A-0 872 943 in which the teeth are of constant width
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