# US 8,541,923 B2 · Dual-rotor motor having heat dissipation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,923 B2 - Document ID: US8541923B2 - Status: Granted - Kind: B2 - Application number: 13/255,005 - Filed: 2010-03-05 - Published: 2012-05-31 - Granted: 2013-09-24 - Earliest claimed: 2009-03-05 - Assignees: CPM Compact Power Motors GmbH - Applicants: Heinz Leiber; Thomas Leiber - Inventors: Heinz Leiber; Thomas Leiber - Web page: https://patentgrep.com/patent/US8541923B2 ## CPC - H02K 16/02: Machines with one stator and two {or more} rotors - H02K 1/18: Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures - H02K 1/20: with channels or ducts for flow of cooling medium - H02K 3/24: with channels or ducts for cooling medium between the conductors - H02K 5/08: Insulating casings - H02K 5/203: {specially adapted for liquids, e.g. cooling jackets} - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 9/223: {Heat bridges} - H02K 5/207: {with openings in the casing specially adapted for ambient air} - H02K 9/227: {Heat sinks} - H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines - 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 motor may include an outer rotor and an inner rotor, with a stator, which carries the excitation coils, formed as a hollow cylinder and engaging in the pot-shaped outer rotor and being connected to the housing or to a part of the electric motor fixedly connected to the housing, and where the electric motor may further include a water cooling and an air cooling system. ## Claims ### Claim 1 An electric motor comprising: a pot-shaped outer rotor; an inner rotor; and a stator configured to carry excitation coils, wherein the stator is formed as a hollow cylinder and engages in the outer rotor and is connected with its front face to a housing or to a part of the electric motor fixedly connected to the housing, the stator comprising yokes containing the excitation coils and supports arranged between the yokes; wherein the electric motor has a water cooling system and an air cooling system, wherein the water cooling system is configured to cool the excitation coils, the housing, or both; wherein the supports comprise at least one channel for water cooling in a region between adjacent pole shoes of the yokes, the at least one channel including an inflow channel, a return channel, and a connecting channel configured to connect the inflow channel and the return channel. ### Claim 2 (depends on 1) The electric motor according to claim 1, wherein the electric motor comprises at least one fan impeller or fan blade arranged on the rotor. ### Claim 3 (depends on 1) The electric motor according to claim 1, wherein the cooling channels are formed by a casting process or injection molding process by suitable shaping of the mold or by insert parts in the mold. ### Claim 4 (depends on 1) The electric motor according to claim 1, wherein the connecting channel is formed by a bent tube or hose. ### Claim 5 (depends on 1) The electric motor according to claim 1, further comprising a cover arranged on the stator to form the connecting channel between the stator and the cover. ### Claim 6 (depends on 1) The electric motor according to claim 1, wherein the housing comprises channels through which cooling water flows. ### Claim 7 (depends on 1) The electric motor according to claim 1, wherein a control unit is arranged in or on the housing. ### Claim 8 (depends on 1) The electric motor according to claim 1, wherein at least one of the yokes is of double T-shaped cross-section. ### Claim 9 (depends on 7) The electric motor according to claim 7, wherein the control unit is integrated in or on the housing. ### Claim 10 (depends on 5) The electric motor according to claim 5, wherein the inflow channel and the outflow channel enter and exit, respectively, the support on one side of the stator, and wherein the cover is arranged on the stator to form the connecting channel between the inflow channel and the return channel on the one side of the stator. ### Claim 11 (depends on 5) The electric motor according to claim 5, wherein the cover is attached to one side of the support. ### Claim 12 (depends on 11) The electric motor according to claim 11, wherein the cover is attached to the support using at least one insertable fastener.