Abstract: A rotor assembly including a body member, a first shaft member and a second shaft member. The body member includes an inner wall defining a cavity inside the body member. The first shaft member is inserted into the body member and extends at least partially in the cavity of the body member. The second shaft member is inserted into the body member and extends from a first end portion of the body member to a second end portion of the body member. The second shaft member is at least partially surrounded by the first shaft member. The first shaft member is configured to provide a medium along the inner wall of the body member, and the second shaft member is configured to provide the medium at each of the first end portion and the second end portion of the body member.

Abstract: A rotor air cooling system including an outer housing and an inner housing configured to be inserted into the outer housing, the inner housing including an open backend. The system further includes a stator attached to an interior side of the inner housing, a main rotor body included in the inner housing, the main rotor body being arranged around a rotor shaft arranged to extend through the inner housing and the outer housing, wherein cooling air axially enters the main rotor body in an inlet end, passes through cavities of the main rotor body, and exits the main rotor body in an outlet end, and a water jacket arranged between the inner housing and the outer housing. Moreover, the system includes a heat exchanger for dissipating heat from the cooling air exiting the main rotor body.

Abstract: A rotor assembly for an electric machine is described herein. The rotor assembly comprises a body member, a first shaft member and a second shaft member. The body member comprises an inner wall defining a cavity in the body member. The body member is arranged between the first shaft member and the second shaft member. The first shaft member comprises a tube arranged through the first shaft member and extending at least partially in the cavity of the body member. An end of the tube exposed in the cavity comprises a medium dispersion unit configured to disperse a medium in the cavity and the medium dispersion unit comprises an impeller element configured to provide a turbulent flow of the medium.

Abstract: The present disclosure relates to an electric machine, a vehicle comprising such an electric machine and a manufacturing method for such an electric machine. The electric machine comprises a stator unit, a rotor unit, a housing, and a heat exchanging unit. The stator unit and the rotor unit are arranged inside the housing and the housing comprises an inlet port configured to provide a medium inside the housing and an outlet port configured to release the medium out of the housing. The heat exchanging unit is coupled with each of the inlet port and the outlet port and comprises a plurality of channels arranged on an outer surface of the housing. The plurality of channels being configured to transfer heat between the medium and the environment.

Abstract: An electric machine including a housing, a movable element within the housing, a stator surrounding the movable element within the housing, the stator including a plurality of windings with end windings at a first end and a second end, and a stator cooling system including an inlet through the housing, cooling ducts connected to the inlet and extending though the plurality of windings, and a wind cap at each of the first end and the second end of the end windings, encapsulating each of end windings such that a coolant flows from the inlet to the wind cap through the cooling ducts, wherein each wind cap includes at least one outlet. The present disclosure further relates to a method of cooling an electric machine.

Abstract: A rotor assembly including a body member, a first shaft member and a second shaft member. The body member includes an inner wall defining a cavity inside the body member. The first shaft member is inserted into the body member and extends at least partially in the cavity of the body member. The second shaft member is inserted into the body member and extends from a first end portion of the body member to a second end portion of the body member. The second shaft member is at least partially surrounded by the first shaft member. The first shaft member is configured to provide a medium along the inner wall of the body member, and the second shaft member is configured to provide the medium at each of the first end portion and the second end portion of the body member.

Abstract: The present disclosure relates to an electric machine, a vehicle comprising such an electric machine and a manufacturing method for such an electric machine. The electric machine comprises a stator unit, a rotor unit, a housing, and a heat exchanging unit. The stator unit and the rotor unit are arranged inside the housing and the housing comprises an inlet port configured to provide a medium inside the housing and an outlet port configured to release the medium out of the housing. The heat exchanging unit is coupled with each of the inlet port and the outlet port and comprises a plurality of channels arranged on an outer surface of the housing. The plurality of channels being configured to transfer heat between the medium and the environment.

Abstract: A rotor assembly for an electric machine is described herein. The rotor assembly comprises a body member, a first shaft member and a second shaft member. The body member comprises an inner wall defining a cavity in the body member. The body member is arranged between the first shaft member and the second shaft member. The first shaft member comprises a tube arranged through the first shaft member and extending at least partially in the cavity of the body member. An end of the tube exposed in the cavity comprises a medium dispersion unit configured to disperse a medium in the cavity and the medium dispersion unit comprises an impeller element configured to provide a turbulent flow of the medium.

Abstract: A rotor air cooling system including an outer housing and an inner housing configured to be inserted into the outer housing, the inner housing including an open backend. The system further includes a stator attached to an interior side of the inner housing, a main rotor body included in the inner housing, the main rotor body being arranged around a rotor shaft arranged to extend through the inner housing and the outer housing, wherein cooling air axially enters the main rotor body in an inlet end, passes through cavities of the main rotor body, and exits the main rotor body in an outlet end, and a water jacket arranged between the inner housing and the outer housing. Moreover, the system includes a heat exchanger for dissipating heat from the cooling air exiting the main rotor body.