Method of making a sectioned stator for a dynamoelectric machine

DETAILED DESCRIPTION By the present invention one has obtained a new process for the production of the above said machines, which process is especially outstanding by its great economical advantages.
In accordance with the process of the present invention, the various elements comprising the stator are formed in at least two axially divided sections including as integral elements thereof, the laminations or permanent magnets which are permanently secured in a moulded plastic mass and which sections may thereafter be assembled with a rotor which may also be preassembled to include various components comprising the rotor assembly.
It is advantageous to arrange the laminations and/or the magnets in a mould so that the laminations and/or the magnets form a geometrically accurately confined surface, the elements being permanently fixed in the mould by means of the moulding mass.
As a result thereof after-treatment of the rotor cavity by turning or the like becomes superfluous.
The process makes it also possible to furnish the stator with finished bearing seats and fastening means for the electrical conducts between stator and rotor.
The mounting of bearings in a conventional electric motor means namely that the bearing is pressed into its final place from one side and is secured in a suitable way.
It is important that such a bearing is as much as possible tightly covered, so that contamination is avoided and grease is retained.
When a bearing is pushed into its position in a conventional way, the housing in which the bearing is supported can, of course, surround the bearing at only one side, and hence, some kind of seal must be arranged at the other side of the bearing.
As such bearings normally are held in position by the friction between the outer side of the outer ring and the housing, rotation of the outer ring may occur, as by heating the housing which usually is made of pressmoulded aluminium expands more than the outer ring of this bearing and a certain reduction of the retaining forces will occur