Abstract: A cooling system for an electric traction machine, including a circulation system for guiding a first cooling liquid, a first circulation pump for conveying the first cooling liquid in the circulation system, and a motor inlet connection for fluidically connecting the circulation system on an inlet side to a first winding head region of an electric traction machine intended to be temperature-controlled. The cooling system includes a motor outlet connection for fluidically connecting the circulation system on an outlet side to a second winding head region of an electric traction machine intended to be temperature-controlled, and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. A plurality of cooling grooves are arranged between the winding head regions to guide the first cooling liquid. Respective highest locations on the winding head regions are fluidically connected to each other by a second deaeration line.

Abstract: A cooling system for an electric traction machine for a motor vehicle includes a circuit system for conducting a first coolant to be circulated, a circulation pump for conveying the first coolant in the circuit system in a first circulation direction, and an expansion tank filled at least partially with the first coolant and at least partially with a gas. The cooling system also includes a motor input terminal for fluidically connecting the circuit system on an input side to the electric traction machine, a motor output terminal for fluidically connecting the circuit system on an output side to the electric traction machine, and a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant. The expansion tank is exclusively connected on a gas side to at least one volume equalization tank which is closed gas-tight to an environment.

Abstract: A cooling system for an electric traction machine for a motor vehicle includes a looped conduit system for conducting a first cooling liquid and a circulation pump for conveying the first cooling liquid in the looped conduit system in a first circulation direction. The system further includes an expansion tank filled at least partially with the first cooling liquid and at least partially with a gas and a motor input terminal for fluidically connecting the looped conduit system on an input side to an electric traction machine to be temperature-controlled. The system further includes a motor output terminal for fluidically connecting the looped conduit system on an output side to the traction machine and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. The expansion tank is configured with an aperture that is open to the environment.

Abstract: A cooling system for an electric traction machine for a motor vehicle, including a circuit system for conducting a first coolant to be circulated, a first circulation pump for conveying the first coolant in the circuit system, an AC housing for an AC connection for the electric traction machine, and a motor inlet connection for fluidly connecting the circuit system on the input side to the electric traction machine to be temperature-controlled. The cooling system further includes a motor outlet connection for fluidly connecting the circuit system on the output side to the electric traction machine to be temperature-controlled, a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant to be circulated in the circuit system, and a first main line, by which the first heat exchanger and the AC housing are fluidly connected to one another.

Abstract: A drive unit includes an electric motor for propulsion and a cooling system. The electric motor includes a stator assembly and a rotor assembly, the stator assembly including a housing, a core with grooves, and a winding assembly. The winding assembly extends through the grooves. The housing includes a housing inlet and outlet. The cooling system includes a first cooling circuit to enable a direct cooling of the winding assembly. The first cooling circuit includes an expansion tank assembly, including a tank, a tank inlet and outlet, and a volume change assembly. The volume change assembly enables change of the total volume of the first cooling circuit as a function of pressure in the first cooling circuit such that, as the pressure in the first cooling circuit increases, a first volume is increased and, as the pressure in the first cooling circuit decreases, the first volume is reduced.

Abstract: A cooling system for cooling an electric machine of a motor vehicle, including a supply line, at least one cooling line, and a bypass line. The supply line is for supplying a cooled coolant to a first winding head region of the electric machine. The at least one cooling line leads from the first winding head region through a stator of the electric machine up to a second winding head region of the electric machine. The bypass line is guided from the first winding head region to the second winding head region past the stator. The bypass line, to collect and/or discharge air, exits from the first winding head region at a highest position in a direction of gravity and/or opens into the second winding head region at a highest position in the direction of gravity.

Abstract: A cooling system for an electric traction machine includes a looped conduit system for conducting a first cooling liquid and a circulation pump for conveying the first cooling liquid in a first circulation direction. The cooling system includes an expansion tank filled at least partially with the first cooling liquid and a gas, and a motor input terminal for fluidically connecting the looped conduit system on an input side to the electric traction machine. The cooling system includes a motor output terminal for fluidically connecting the looped conduit system on an output side to the electric traction machine and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. In the first circulation direction, the first heat exchanger is arranged downstream of the electric traction machine and connected via the motor input and output terminal and upstream of the expansion tank.

Abstract: A motor vehicle including a drive unit with an electric machine, wherein the electric machine is a directly cooled electric machine, a transmission, a first cooling loop for cooling assemblies of the directly cooled electric machine using a first dielectric coolant which flows directly around respective assemblies of the electric machine, a second cooling loop for cooling the transmission using a second coolant designed as a transmission oil, and a third cooling loop using a third coolant. The first cooling loop and the third cooling loop are coupled via a first heat exchanger, and the second cooling loop and the third cooling loop are coupled via a second heat exchanger.

Abstract: A machine cooling circuit of an electric machine of a motor vehicle, including a coolant adapted to flow through the machine cooling circuit and a compensating reservoir, which separates air included in the coolant. The electric machine is a directly cooled electric machine, which is accommodated in the machine cooling circuit such that the coolant flows through it.

Abstract: A cooling system for an electric traction machine for a motor vehicle, including a circuit system for conducting a first coolant to be circulated, a first circulation pump for conveying the first coolant in the circuit system, and a motor inlet connection for fluidically connecting the circuit system on an inlet side with a first winding head region of an electric traction machine to be temperature-controlled. The cooling system includes a motor outlet connection for fluidically connecting the circuit system on an outlet side with a second winding head region of the electric traction machine to be temperature-controlled and a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant. The cooling system includes a bypass line, by which the first heat exchanger via at least one connection and the second winding head region are directly fluidically connected to one another via a further connection.

Abstract: A cooling system for an electric traction machine for a motor vehicle, including a circuit system for conducting a first coolant to be circulated, a first circulation pump for conveying the first coolant in the circuit system, an AC housing for an AC connection for the electric traction machine, and a motor inlet connection for fluidly connecting the circuit system on the input side to the electric traction machine to be temperature-controlled. The cooling system further includes a motor outlet connection for fluidly connecting the circuit system on the output side to the electric traction machine to be temperature-controlled, a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant to be circulated in the circuit system, and a first main line, by which the first heat exchanger and the AC housing are fluidly connected to one another.

Abstract: A cooling system for an electric traction machine, including a circulation system for guiding a first cooling liquid, a first circulation pump for conveying the first cooling liquid in the circulation system, and a motor inlet connection for fluidically connecting the circulation system on an inlet side to a first winding head region of an electric traction machine intended to be temperature-controlled. The cooling system includes a motor outlet connection for fluidically connecting the circulation system on an outlet side to a second winding head region of an electric traction machine intended to be temperature-controlled, and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. A plurality of cooling grooves are arranged between the winding head regions to guide the first cooling liquid. Respective highest locations on the winding head regions are fluidically connected to each other by a second deaeration line.

Abstract: A cooling system for an electric traction machine for a motor vehicle includes a circuit system for conducting a first coolant to be circulated, a circulation pump for conveying the first coolant in the circuit system in a first circulation direction, and an expansion tank filled at least partially with the first coolant and at least partially with a gas. The cooling system also includes a motor input terminal for fluidically connecting the circuit system on an input side to the electric traction machine, a motor output terminal for fluidically connecting the circuit system on an output side to the electric traction machine, and a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant. The expansion tank is exclusively connected on a gas side to at least one volume equalization tank which is closed gas-tight to an environment.

Abstract: An expansion tank for a cooling system includes at least one inlet for a coolant oil, a first outlet for the coolant oil, a second outlet for a gas, and a connecting channel between the at least one inlet and the first and second outlets. By a horizontal offset, one of the inlets for the coolant oil and the second outlet for a gas are always arranged above the first outlet for the coolant oil in an installation situation in any operating state. A filter medium for removing particles and/or water from the coolant oil is provided between the at least one inlet and the first outlet.

Abstract: A cooling system for an electric traction machine includes a looped conduit system for conducting a first cooling liquid and a circulation pump for conveying the first cooling liquid in a first circulation direction. The cooling system includes an expansion tank filled at least partially with the first cooling liquid and a gas, and a motor input terminal for fluidically connecting the looped conduit system on an input side to the electric traction machine. The cooling system includes a motor output terminal for fluidically connecting the looped conduit system on an output side to the electric traction machine and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. In the first circulation direction, the first heat exchanger is arranged downstream of the electric traction machine and connected via the motor input and output terminal and upstream of the expansion tank.

Abstract: A cooling system for cooling an electric machine of a motor vehicle, including a supply line, at least one cooling line, and a bypass line. The supply line is for supplying a cooled coolant to a first winding head region of the electric machine. The at least one cooling line leads from the first winding head region through a stator of the electric machine up to a second winding head region of the electric machine. The bypass line is guided from the first winding head region to the second winding head region past the stator. The bypass line, to collect and/or discharge air, exits from the first winding head region at a highest position in a direction of gravity and/or opens into the second winding head region at a highest position in the direction of gravity.

Abstract: A cooling system for an electric traction machine for a motor vehicle includes a looped conduit system for conducting a first cooling liquid and a circulation pump for conveying the first cooling liquid in the looped conduit system in a first circulation direction. The system further includes an expansion tank filled at least partially with the first cooling liquid and at least partially with a gas and a motor input terminal for fluidically connecting the looped conduit system on an input side to an electric traction machine to be temperature-controlled. The system further includes a motor output terminal for fluidically connecting the looped conduit system on an output side to the traction machine and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. The expansion tank is configured with an aperture that is open to the environment.

Abstract: A drive unit for an electric vehicle including an electric motor, with a stator assembly and rotor assembly, and a cooling system. The stator assembly includes a housing, a stator core having grooves, and a winding assembly. The winding assembly extends through the grooves. The housing includes a housing inlet and outlet connected the grooves. The cooling system includes a first cooling circuit connected to the housing inlet and outlet to enable direct cooling of the winding assembly. The first cooling circuit includes an expansion tank assembly including an expansion tank, at least one inlet, one outlet, and a pressure equalization assembly. The expansion tank is connected to the first cooling circuit via the at least one inlet and the outlet. The pressure equalization assembly enables a connection between the expansion tank and an ambient environment to cause a pressure equalization between the expansion tank and ambient environment.

Abstract: A drive unit includes an electric motor for propulsion and a cooling system. The electric motor includes a stator assembly and a rotor assembly, the stator assembly including a housing, a core with grooves, and a winding assembly. The winding assembly extends through the grooves. The housing includes a housing inlet and outlet. The cooling system includes a first cooling circuit to enable a direct cooling of the winding assembly. The first cooling circuit includes an expansion tank assembly, including a tank, a tank inlet and outlet, and a volume change assembly. The volume change assembly enables change of the total volume of the first cooling circuit as a function of pressure in the first cooling circuit such that, as the pressure in the first cooling circuit increases, a first volume is increased and, as the pressure in the first cooling circuit decreases, the first volume is reduced.

Abstract: A motor vehicle including a drive unit with an electric machine, wherein the electric machine is a directly cooled electric machine, a transmission, a first cooling loop for cooling assemblies of the directly cooled electric machine using a first dielectric coolant which flows directly around respective assemblies of the electric machine, a second cooling loop for cooling the transmission using a second coolant designed as a transmission oil, and a third cooling loop using a third coolant. The first cooling loop and the third cooling loop are coupled via a first heat exchanger, and the second cooling loop and the third cooling loop are coupled via a second heat exchanger.