# US 6,724,287 B2 · Electromagnet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,724,287 B2 - Document ID: US6724287B2 - Status: Granted - Kind: B2 - Application number: 10/182,943 - Filed: 2002-08-02 - Published: 2003-01-16 - Granted: 2004-04-20 - Earliest claimed: 2000-12-22 - Assignees: Robert Bosch GmbH - Inventors: Volker Nadenau; Thomas Kupfer - Web page: https://patentgrep.com/patent/US6724287B2 ## CPC - H01F 7/06: Electromagnets; Actuators including electromagnets {(electric coils H01F5/00; devices for holding workpieces using electric force B23Q3/15; load-engaging elements for lifting articles electromagnetically B66C1/06; electromagnetic couplings F16D27/00; magnetic brakes F16D63/002; electromagnetically operated valves F16K11/24, F16K31/00; analysing materials by magnetic means G01N27/72, G01N27/80; electromagnets for winding mechanical clocks G04C1/02; electromagnetic relays H01H51/00; windings for salient poles of dynamo-electric machines H02K3/18; electromagnets for telegraphic communication H04L; for arc lamps H05B31/28)} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract In an electromagnet (10) having a magnet coil (13), which has an exciter winding (23) wound from an insulated winding wire (24), having a magnet core (14), having a movable armature (16) opposite the magnet core (14), and having a restoring spring (21) engaging the armature (16), a plurality of meltable stanchions (26) of electrically conductive material that are connected electrically conductively to one another are disposed on the magnet coil (13), for the sake of later calibration of the magnetic force furnished by the completed electromagnet (10). The winding wire (24) is guided around each of the stanchions (26), in selected windings of the exciter winding. To adjust the desired magnetic force, at least two stanchions (26) are melted, so that they form a reliable weld with the winding wire (24), through the wire insulation thereof (FIG. 4). ## Claims ### Claim 1 An electromagnet, having a magnet coil (14) which has an exciter winding (23) wound from an insulated winding wire (24), having a magnet core (14), having a movable armature (16) opposite the magnet core (14) with an air gap spacing between them, and having a restoring spring (21), engaging the armature (16), the spring force of which is oriented counter to the magnetic force, characterized in that disposed on the magnet coil (14) are a plurality of meltable stanchions (26) of electrically conductive material that are electrically conductively connected to one another, and that in selected windings of the exciter winding (23), the winding wire (24) is wrapped around each one of the stanchions (26) individually. ### Claim 2 (depends on 1) The electromagnet of claim 1, characterized in that one of the stanchions (26), preferably the stanchion (261), which in the winding course is associated with the first or last winding encompassing a stanchion (26), is electrically conductively welded to the winding portion wrapping around it, through the wire insulation thereof. ### Claim 3 (depends on 2) The electromagnet of claim 2, characterized in that the winding portion welded to the stanchion (261) forms the winding end of the exciter winding (23). ### Claim 4 (depends on 2) The electromagnet of claim 2, characterized in that at least one selected further stanchion (26) is welded electrically conductively to the winding portion wrapping around it, through the wire insulation thereof. ### Claim 5 (depends on 4) The electromagnet of claim 4, characterized in that the exciter winding (23) is embodied with a number of windings that is greater than the number of windings calculated for a requisite magnetic force. ### Claim 6 (depends on 1) The electromagnet of claim 1, characterized in that the stanchion (26) is combined, via a rib (27) of electrically conductive material integrally joined to each stanchion (26), to form a stanchion strip (28). ### Claim 7 (depends on 6) The electromagnet of claim 6, characterized in that the magnet coil (14) has a coil body (22) that carries the exciter winding (23), and that the stanchion strip (28) is retained on the coil body (22). ### Claim 8 (depends on 6) The electromagnet of claim 6, characterized in that the rib (27) of the stanchion strip (28) is injection-molded into the coil body (22). ### Claim 9 (depends on 8) The electromagnet of claim 8, characterized in that the coil body (22) is embodied like a yarn reel, with a cylindrical middle part (221) that receives the exciter winding (23) and with two flanges (222), each disposed on one end of the middle part (221) and covering the face ends of the exciter winding (23); and that the rib (27) of the stanchion strip (28) is injection-molded into one flange (222) in such a way that the stanchions (26) on the flange circumference protrude essentially radially freely. ### Claim 10 (depends on 9) The electromagnet of claim 9, characterized in that the exciter winding (23) is embodied in multiple layers, and the windings wrapping around the stanchions (26) are located in the uppermost layer, in the end region of the exciter winding (23). ### Claim 11 (depends on 6) The electromagnet of claim 6, characterized in that the magnet coil (13) is surrounded by a housing (17); and that in the housing (17), there is an opening (29) that is congruent with the stanchion strip (28). ### Claim 12 (depends on 11) The electromagnet of claim 11, characterized in that the opening (29) is closed with a potting composition. ### Claim 13 (depends on 1) The electromagnet of claim 1, characterized by its use in an electromagnetic actuator, preferably a proportional pressure regulating valve (11), for transmission control in motor vehicles, in that the armature (16) is secured to an actuating tappet, preferably a valve slide (12) of the proportional pressure regulating valve (11).