# US 5,705,874 A · Disc for electrodynamics motors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,705,874 A - Document ID: US5705874A - Status: Granted - Kind: A - Application number: 08/767,559 - Filed: 1996-12-16 - Granted: 1998-01-06 - Earliest claimed: 1996-12-16 - Assignees: Gerhard Geiger GmbH & Co. - Inventors: Josef Grudl - Web page: https://patentgrep.com/patent/US5705874A ## CPC - H02K 1/146: {consisting of a generally annular yoke with salient poles} - Y10T 29/49009: Dynamoelectric machine - Y10T 29/49012: Rotor - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a disc (10) for the magnetic circuit of an electrodynamic motor with a central opening (12) and segments (14, 16) disposed about said opening (12), said segments having radially aligned legs (18, 20) and if necessary peripherally-extending arms (22, 25), said legs defining winding grooves (30) radially accessible from the exterior with openings (32) formed in the region of the free radial ends of the legs (20). The openings (32) may be closed by bending the legs (18, 20) and/or the arms (22, 24) (FIG. 1 ). ## Claims ### Claim 1 A disk for the magnetic circuit of an electrodynamic motor, comprising (i) a central opening having a diameter, (ii) a plurality of legs extending radially from said central opening and being peripherally spaced from each other, (iii) even alternate ones of said legs each formed with outer arms, said arms peripherally extending in opposite directions from each other, (iv) odd alternate ones of said legs each having a radially outer free end, (v) each of said outer arms having a peripheral free end for forming a slot between the peripheral free end and an adjacent radially outer free end adjacent to alternate ones of said peripheral free ends, (vi) a winding groove disposed between each leg, each of said winding grooves being accessible from the outside through said slot, and (vii)(a) the radially outer free ends each of said odd alternate legs having groove dividing said free end into two radially outward extending parts for bending each such outward extending part toward an adjacent end of said peripheral free end of an adjacent outer arm for closing the slot, or (b) the peripherally free ends of each leg being bendable toward an adjacent radially outer free end for closing the slot. ### Claim 2 (depends on 1) The disk of claim 1, wherein said (i) odd alternate ones of said legs, (ii) said outer arms, or (iii) both said legs and said outer arms are made of a flexible material. ### Claim 3 (depends on 1) The disk of claim 1, wherein the width of the slot is larger than the diameter of the wire to be used for winding in said groove. ### Claim 4 (depends on 1) The disk of claim 1, wherein said slot is a radially open slot. ### Claim 5 (depends on 1) The disk of claim 1, wherein each of said outer arms has a bending site in a predetermined location thereon. ### Claim 6 (depends on 1) The disk of claim 1, wherein said slot is tapered for a radially inward enlargement. ### Claim 7 (depends on 6) The disk of claim 6, wherein said radially outer free end has a radially outwardly narrowing tapered end, and each of said peripherally free ends of said outer arms are tapered widening radially inwardly, whereby said tapered peripherally free ends of said outer arms when bent inwardly toward said tapered radially outer free ends form a weldable closure of said slot. ### Claim 8 (depends on 7) The disk of claim 7, wherein each of said even alternate legs is formed with two inner peripherally extending inner arms disposed opposite to each other, said inner arms being disposed radially inwardly from said outer arms, said inner arms, said peripherally outer free ends of said outer arms having an inside surface for establishing contact with the radially outer adjacent surface of an inner arm when said weldable closure is formed. ### Claim 9 (depends on 1) The disk of claim 1, wherein one or more of said winding grooves is provided with a radially inward extension toward said central opening. ### Claim 10 (depends on 9) The disk of claim 9, wherein said winding groove and said radially inward extension is lined with an insulating material. ### Claim 11 (depends on 10) The disk of claim 10 when after assembly with like disks into a stator packet, wherein the diameters of the central openings of the disks in the stator packet are enlarged so that said radially inward extension of each disk and the insulating lining therein extend to said central opening. ### Claim 12 A process for making a stator packet from a plurality of disks each of which comprises, (i) a central opening having a diameter, (ii) a plurality of legs extending radially from said central opening and being peripherally spaced from each other, (iii) even alternate ones of said legs each formed with outer arms said arms peripherally extending in opposite directions from each other, (iv) odd alternate ones of said legs each having a radially outer free end, (v) each of said outer arms having a peripheral free end for forming a slot between the peripheral free end and an adjacent radially outer free end adjacent to alternate ones of said peripheral free ends, (vi) a winding groove disposed between each leg, each of said winding grooves being accessible from the outside through said slot, and (vii)(a) the radially outer free ends each of said odd alternate legs having a groove dividing said free end into two radially outward extending parts for bending each such outward extending parts for bending each such outward extending part toward an adjacent end of said peripheral free end of an adjacent outer arm for closing the slot, or (b) the peripherally free ends of each leg being bendable toward an adjacent radially outer free end for closing the slot, the process comprising placing a predetermined plurality of disks adjacent to each other to form a stator packet having opposed ends, lining the winding grooves of the assembled disks with an insulating material, winding a wire into said lined grooves, closing the slots of the disks in the stator packet, and optionally applying a hollow cylindrical shaft to the opposed ends of the stator packet. ### Claim 13 (depends on 12) The process of claim 12, wherein the stator packet is assembled from disks in which each of said winding grooves is provided with a radially inward extension toward said central opening, further comprising enlarging the diameter of said central opening to expose the radially inward bottom of each radially inward extension to said central opening.