U.S. Philips Corporation

Peter W De Haas

Jan Haisma

Gijsbertus A Spierings

Evert M Kamerbeek

Jakob Vijfvinkel

Lambertus Postma

Waltherus W Van Den Hoogenhof

Franciscus J Van Der Kruis

Dirk K De Boer

Method of polishing a surface (5a) of copper or an alloy comprising mainly copper, in which a polishing means is moved across the surface while exerting a polishing pressure of approximately 500 g/cm.sup.2 for obtaining a plane and smooth polished surface without any defects. A composition of a polishing component comprising a colloidal suspension of SiO.sub.2 particles having an average particle size of between 20 and 50 nm in an alkali solution, demineralized water and a chemical activator is used as a polishing means.

Method of polishing a surface of copper or an alloy comprising mainly

The method of intimately joining a hard magnetic part to a soft magnetic part in the manufacture of an electrical machine comprising polishing the joining surfaces such that the surface roughness hight is about less than or equal to two nanometers and joining the parts by direct bonding.

Electrical machine and method of manufacturing the electrical machine

An electrical machine comprises a stationary first section (1) and a second section (5) which is movable relative to the stationary section. At least one of the sections comprises a soft-magnetic part (7) and a hard-magnetic part (9). A surface (7a) of the soft-magnetic part and a surface (9a) of the hard-magnetic part are fixed intimately to one another by direct bonding.

Electrical machine with directly bonded magnetic parts

Methods and device for manufacturing a plate with a plane main surface or with parallel main surfaces, whereby material is taken off from the edges of the plate and from the central portion of the plate alternately by means of polishing in order to obtain main surfaces having a convex, plane, or concave shape. Polishing is stopped after at least one transition from convex to concave or vice versa at the moment at which the main surface has a substantially plane shape or has substantially parallel main surfaces.

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Eindhoven, Netherlands

Peter W De Haas