Skf Magnetic Mechatronics

Societe De Mecanique Magnetique

Aktiebolaget Skf

David Moulin

Luc Baudelocque

Bruno Tellier

Maurice L Brunet

Mohamed Bendaoud

Yves Dupuis

Roger Lhostis

An electrical connector providing a sealed electrical link between an inside environment subjected to corrosive gases or liquids under pressure and an outside environment of different pressure. The connector includes a connector body, conductor cables, a thermoplastic insulator, and a sealing element. The connector body is secured to a structure and includes insulating feed-throughs for receiving electrical contacts connecting an outside environment to an inside environment. The conductor cables, comprising an outer insulating layer made of a fusible thermoplastic material, are connected to said electrical contacts inside said inside environment. The thermoplastic insulator is secured to said connector body and surrounds the conductor cables. The thermoplastic insulator and cable outer insulating layers are made of a same type of fusible thermoplastic material making it possible, by localized fusion, to form a thermoplastic weld therebetween. The sealing element is mounted between the connector body and the thermoplastic insulator.

Sealed electrical connector for magnetic bearings

In a jacketed active magnetic bearing for a rotary machine having a rotor in contact with a process gas, there is provided a magnetic bearing comprising a bearing armature of laminated magnetic material secured to said rotor, a bearing stator protected by a first jacket of magnetic anti-corrosion material that co-operates with first housing portions to form a first leaktight housing enclosing the bearing stator, the first jacket being made of a ferritic stainless steel, and the first housing portions having insert parts that are also made of ferritic stainless steel, and that are connected by welds to a housing end-wall portion made of a magnetic anti-corrosion material, the laminated magnetic material forming the bearing armature and the detector armature also being a ferritic stainless steel.

Corrosion-resistant jacketed active magnetic bearing

An electrical connection is provided for an environment that is subjected to corrosive gases or liquids. An outer insulating layer is formed on each of at least two conductors and made up of a fluorinated polymer that is meltable at a temperature situated between the temperature of the environment and a predetermined higher temperature. A heat-shrink sleeve surrounds the conductors and is made up of an outer layer of heat-shrink polymer and an inner layer of the fluorinated polymer that is meltable at a temperature situated between the temperature of the environment and the predetermined higher temperature. A weld is formed by melting the outer insulating layers of the conductors and the inner layer of the heat-shrink sleeve by heating to a temperature higher than the temperature of the environment and lower than the predetermined higher temperature, thereby making a weld that is continuous and leaktight, and of controlled thickness.

Electrical appliance with leaktight connections, and a method of fabrication

A canned or sleeved rotary machine is equipped with a rotor () in contact with a particle-laden, acidic or corrosive gaseous atmosphere, and with a functional electrical assembly such as a magnetic bearing comprising a rotor armature () secured to the rotor () and placed in the gaseous atmosphere and a stator armature () secured to a stationary support () and positioned facing the rotor armature (), the stator armature () comprising at least one winding () and a ferromagnetic body () which are positioned in a protective metal enclosure comprising a solid part secured to the stationary support () or coincident therewith, a thin can or sleeve () and a hermetic passage () for wiring () supplying the windings (). A potting compound () fills residual internal gaps left in the ferromagnetic body (), the windings () and the wiring (), and a dead volume () in which the pressure is below atmospheric pressure is created inside the protective metal enclosure ().

Canned or sleeved rotary machine and method of manufacturing it

The invention relates to a jacketed axial magnetic bearing for a rotary machine having a rotor in contact with a gaseous atmosphere that is corrosive, acid, or carrying particles, the bearing comprising a rotor armature in the form of a disk secured to the rotor and placed in the gaseous atmosphere, and a stator magnetic circuit secured to a stationary support device and placed facing the rotor armature, the magnetic circuit of the stator comprising at least one coil and a ferromagnetic body placed in a metallic protective enclosure. The protective enclosure comprises firstly an annular support of channel section with a web and inner and outer flanges presenting a thickness of several millimeters and a length that is less than the length of the stator magnetic circuit, and secondly an annular jacket in the form of a channel-section cover machined from a solid piece and thus without welds, the jacket having inner and outer flanges and a closure web presenting a thickness smaller than the thicknesses of the inner and outer flanges, the free ends of the inner and outer flanges of the jacket being welded to the free ends of the inner and outer flanges of the annular support.

Growing community of inventors

Montrouge, France

David Moulin