# US 10,500,937 B2 · Electric drive unit, hybrid drive device, and vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,500,937 B2 - Document ID: US10500937B2 - Status: Granted - Kind: B2 - Application number: 15/532,119 - Filed: 2015-10-09 - Published: 2017-09-21 - Granted: 2019-12-10 - Earliest claimed: 2014-12-01 - Assignees: Volkswagen Aktiengesellschaft - Applicants: Volkswagen Aktiengesellschaft - Inventors: Cleef Thackwell; Gerd Stoehr - Web page: https://patentgrep.com/patent/US10500937B2 ## CPC - B60K 6/26: characterised by the motors or the generators - B60K 6/365: with the gears having orbital motion - B60K 6/38: characterised by the driveline clutches (shift clutches within the gearing or transmission B60K6/36) - B60K 6/48: Parallel type - B60K 6/547: the transmission being a stepped gearing - B60L 50/13: using AC generators and AC motors - B60L 50/51: characterised by AC-motors - H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) - H02K 7/108: with friction clutches - H02K 7/116: with gears - H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil - H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K 17/16: having rotors with internally short-circuited windings, e.g. cage rotors - H02P 25/184: {wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa} - B60K 11/00: Arrangement in connection with cooling of propulsion units - B60K 11/02: with liquid cooling - B60K 2001/006: {the electric motors} - B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft} - B60K 2006/4833: {Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range} - B60Y 2306/03: Lubrication - H02K 1/32: with channels or ducts for flow of cooling medium - Y02T 10/62: Hybrid vehicles - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An electric drive unit for a hybrid drive, in particular for a vehicle, has an increased power output and degree of efficiency, while thermal loading as well as required installation space and manufacturing costs are minimized. The electric drive unit has an asynchronous machine with a rotor with a rotor cage, in particular a rotor cage which is formed with copper conductors. The asynchronous machine is formed with a stator having a shaft winding. The shaft winding is formed with a device for star-delta changeover. The rotor is formed with a rotor internal cooling device. A step-up gear mechanism is arranged in a power train between the rotor and the output element. There is also described a hybrid drive device with an electric drive unit, and a vehicle that has an electric drive unit and/or a hybrid drive device. ## Claims ### Claim 1 An electric drive unit, comprising: an output element for outputting mechanical energy that is generated in the electric drive unit; an asynchronous machine having a rotor formed with a squirrel cage and having a stator fitted with a wave winding; said wave winding being configured with a device for performing a star-delta switching function; said rotor having a rotor interior cooling device; and a transmission gearing arranged in a force flow between said rotor and said output element. ### Claim 2 (depends on 1) The electric drive unit according to claim 1, wherein said squirrel cage is configured with copper conductors. ### Claim 3 (depends on 1) The electric drive unit according to claim 1, configured for a vehicle having an electric drive system or a hybrid drive system. ### Claim 4 (depends on 1) The electric drive unit according to claim 1, wherein said transmission gearing comprises a planetary gear. ### Claim 5 (depends on 4) The electric drive unit according to claim 4, wherein said planetary gear is configured for a dual-shaft operation with an epicyclic transmission. ### Claim 6 (depends on 5) The electric drive unit according to claim 5, wherein said planetary gear has a transmission ratio between 1:1.5 and 1:2. ### Claim 7 (depends on 1) The electric drive unit according to claim 1, which comprises a cooling medium and/or lubricant chamber for said rotor, and wherein said transmission gearing is disposed in or in close vicinity to said cooling medium and/or lubricant chamber. ### Claim 8 (depends on 1) The electric drive unit according to claim 1, wherein said rotor comprises: a rotor carrier having a supporting region that extends substantially in an axial and circumferential direction of said rotor; an arrangement of magnetic regions disposed on said supporting region and configured with a laminated stack and said squirrel cage; and at least one cooling medium duct between said arrangement of magnetic regions and said rotor carrier and encompassed by said rotor interior cooling device. ### Claim 9 (depends on 8) The electric drive unit according to claim 8, wherein said at least one cooling medium duct of said rotor interior cooling device is configured to conduct a flow of a cooling medium and/or a lubricant for cooling and/or lubricating at least said rotor. ### Claim 10 (depends on 1) The electric drive unit according to claim 1, wherein said device for implementing the star-delta switching function comprises: an open multiphase system of said asynchronous machine formed with a predetermined number of phases and open windings; said asynchronous machine having a given number of first connectors and a given number second connectors, wherein the given number is equal to the predetermined number of phases of said asynchronous machine; a circuit arrangement for supplying said asynchronous machine with a multiphase voltage, said circuit arrangement having the predetermined number of phases from an energy source that is configured to deliver a first direct current voltage; said circuit arrangement having a first inverter stage for supplying said first connectors of said asynchronous machine from said energy source and a second inverter stage for supplying said second connectors of said asynchronous machine from said energy source by way of at least one switching element so as to selectively obtain a second direct current voltage from the first direct current voltage of said energy source and to deliver the second direct current voltage to said second inverter stage; and wherein said first inverter stage and said second inverter stage are configured to selectively connect said first and second connectors of said asynchronous machine to form a star connection or a delta connection so as to supply power to said asynchronous machine. ### Claim 11 (depends on 1) A hybrid drive device, comprising: at least one electric drive unit according to claim 1; at least one internal combustion engine; and at least one clutch device for selectively connecting and disconnecting a force flow between said internal combustion engine and said output element of said at least one electric drive unit. ### Claim 12 (depends on 1) A vehicle, comprising an electric drive unit according to claim 1. ### Claim 13 (depends on 12) The vehicle according to claim 12, which further comprises an internal combustion engine and a clutch device for selectively connecting and disconnecting a force flow between said internal combustion engine and said output element of said electric drive unit.