# US 11,309,767 B2 · Drive unit for a drum motor, drum motor, rear flange and production method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,767 B2 - Document ID: US11309767B2 - Status: Granted - Kind: B2 - Application number: 16/307,741 - Filed: 2017-06-27 - Published: 2019-10-03 - Granted: 2022-04-19 - Earliest claimed: 2016-06-30 - Assignees: Interroll Holding AG - Applicants: Interroll Holding AG - Inventors: Erwin Mans; Jurriaen Van Holthe Tot Echten - Web page: https://patentgrep.com/patent/US11309767B2 ## CPC - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 5/04: Casings or enclosures characterised by the shape, form or construction thereof - H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers - H02K 7/116: with gears - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 11/00: Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection (casings, enclosures or supports H02K5/00) - H02K 15/14: Casings; Enclosures; Supports - H02K 5/161: {radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence)} - H02K 2207/03: Tubular motors, i.e. rotary motors mounted inside a tube, e.g. for blinds - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An electric drive unit comprises an electric drive device having a stator and a rotor, the stator and the rotor being disposed in a stator housing which extends along a longitudinal axis, a cable, wherein a first portion of the cable is connected to the drive device, and a liquid encapsulation is disposed on a second portion of the cable which has individual lines which are litz wires. A rear flange at an end side that faces away from an interior of the stator housing and has an annular space disposed on one end of the stator housing, wherein the liquid encapsulation is disposed in the annular space. ## Claims ### Claim 1 An electric drive unit for a drum motor, comprising: an electric drive device having a stator and a rotor, said stator and said rotor being disposed in a stator housing which extends along a longitudinal axis X; a cable, wherein a first portion of the cable is connected to the electric drive device; and a liquid encapsulation disposed on a second portion of the cable that has individual lines which are litz wires; wherein a rear flange is disposed on one end of the stator housing, the rear flange comprising: an annular space disposed on an end side thereof that in the operating state faces away from an interior of the stator housing and which is disposed and configured for receiving the liquid encapsulation of the cable that is connected to the electric drive device; wherein the first portion of the cable is connected to the electric drive device, and the liquid encapsulation is disposed on the second portion of the cable that has individual lines which are litz wires and the liquid encapsulation is disposed in the annular space; and wherein the end regions of the first and second portion of the cable that adjoin the liquid encapsulation are disposed in the annular space. ### Claim 2 (depends on 1) The drive unit pursuant to claim 1, wherein the first portion of the cable has individual lines which are litz wires. ### Claim 3 (depends on 1) The drive unit pursuant to claim 1, wherein the individual lines in any or both of the first portion and the second portion of the cable run in a mutually separate manner or the individual lines in any or both of the first portion or the second portion of the cable run in a common jacket. ### Claim 4 (depends on 1) The drive unit pursuant to claim 1, wherein a direction of main extent of the liquid encapsulation extends so as to be substantially parallel with the end side of the rear flange, such that the liquid encapsulation is disposed so as to be substantially completely within the annular space. ### Claim 5 (depends on 1) The drive unit pursuant to claim 1, wherein the annular space is delimited by an outer wall of the rear flange. ### Claim 6 (depends on 1) The drive unit pursuant to claim 1, wherein the annular space is configured as a groove that is open at the end side. ### Claim 7 (depends on 1) The drive unit pursuant to claim 1, wherein the annular space is delimited by a cover element. ### Claim 8 (depends on 7) The drive unit pursuant to claim 7, wherein the cover element at least in portions closes a groove of a main body of the rear flange, said groove being open at the end side. ### Claim 9 (depends on 7) The drive unit pursuant to claim 7, wherein the rear flange comprises metal, and wherein the cover element comprises a plastics material. ### Claim 10 (depends on 1) The drive unit pursuant to claim 1, further comprising: a rear axle connected to the rear flange, wherein the cable runs through an interior of the rear axle. ### Claim 11 (depends on 10) The drive unit pursuant to claim 10, wherein the rear axle is connected to the rear flange by way of an intermediate tube, and the cable runs through an interior of the intermediate tube. ### Claim 12 (depends on 11) The drive unit pursuant to claim 11, wherein the intermediate tube or the rear axle has a radial opening which opens into the region of the annular space, and the cable runs out of the annular space through the radial opening of the intermediate tube or of the rear axle. ### Claim 13 A drum motor comprising: a drum tube having a cavity configured therein and a longitudinal axis X; and an electric drive unit disposed in the cavity of the drum tube, the electric drive unit comprising: an electric drive device having a stator and a rotor, said stator and said rotor being disposed in a stator housing which extends along the longitudinal axis X; a cable, wherein a first portion of the cable is connected to the electric drive device; and a liquid encapsulation disposed on a second portion of the cable that has individual lines which are litz wires; wherein a rear flange is disposed on one end of the stator housing, the rear flange comprising: an annular space disposed on an end side thereof that in the operating state faces away from an interior of the stator housing and which is disposed and configured for receiving the liquid encapsulation of the cable that is connected to the electric drive device, and wherein the first portion of the cable is connected to the electric drive device, and the liquid encapsulation is disposed on the second portion of the cable that has individual lines which are litz wires and the liquid encapsulation is disposed in the annular space; and wherein the end regions of the first and second portion of the cable that adjoin the liquid encapsulation are disposed in the annular space. ### Claim 14 (depends on 13) The drum motor pursuant to claim 13, wherein a head element comprising an introduction portion that is introduced into a hollow end of the drum tube, wherein the head element further comprises a radially outer wall that at least in portions overlaps the annular space of the rear flange in the direction of the longitudinal axis X of the stator housing. ### Claim 15 (depends on 13) The drum motor pursuant to claim 13, wherein a head element comprising an introduction portion that is introduced into a hollow end of the drum tube, wherein the head element further comprises a radially outer wall that at least in portions overlaps a cover element of the rear flange. ### Claim 16 (depends on 13) A method for producing a drum motor according to claim 13, wherein the method comprises the steps of: providing the drum tube having the cavity configured therein and the longitudinal axis; and disposing in the annular space in the cavity of the drum tube the electric drive unit; wherein the rear flange at an end side that faces away from the interior of the stator housing has the annular space disposed on one end of the stator housing, and the liquid encapsulation. ### Claim 17 A method for producing an electric drive unit for a drum motor, the method comprising the steps of: providing an electric drive device having a stator and a rotor, said stator and said rotor being disposed in a stator housing which extends along a longitudinal axis, wherein a rear flange at an end side that faces away from an interior of the stator housing has an annular space disposed on one end of the stator housing; connecting a first portion of a cable to the electric drive device, wherein a liquid encapsulation is disposed on a second portion of the cable which has the individual lines which are litz wires; and disposing the liquid encapsulation in the annular space; and disposing the end regions of the first and second portions of the cable that adjoin the liquid encapsulation in the annular space.