A motor rotor holder and a motor are provided according to the present application. The motor rotor holder is rotatably supported in a housing of the motor, and the motor rotor holder includes: a first cooling channel which allows interior spaces at two axial sides of a rotor in the housing to be in communication with each other so as to direct a first cooling medium through the first cooling channel; and a second cooling channel which is in communication with an exterior of the housing so as to direct a second cooling medium through the second cooling channel. The first cooling channel and the second cooling channel are provided to have a common heat conduction portion, and the first cooling medium is allowed to exchange heat with the second cooling medium via the common heat conduction portion.

An induction motor may include a housing, a stator, a rotor, and/or cooling fins on an outside surface of the housing. The rotor may include inner air ducts configured to allow passage of airflow therethrough. The motor may include outer air ducts in fluid communication with the inner air ducts to form an air-circulation circuit. The outer air ducts may be arranged radially outside the cooling fins.

An induction motor may include a housing, a stator, a rotor, and/or cooling fins on an outside surface of the housing. The rotor may include inner air ducts configured to allow passage of airflow therethrough. The motor may include outer air ducts in fluid communication with the inner air ducts to form an air-circulation circuit. The outer air ducts may be arranged radially outside the cooling fins.

A liquid-cooled motor includes a motor arranged inside a motor case; an internal tube arranged inside the motor case; an external tube arranged outside the motor case; and a supporting member fixed to the motor case to support the internal tube and the external tube and to allow the internal tube and the external tube to be communicated with each other. The supporting member includes a first supporting portion arranged to the motor case side to support the internal tube; and a second supporting portion arranged to another side opposite to the motor case side to support the external tube. The first supporting portion includes sealing members arranged along an outer circumference surface of the internal tube; an air chamber arranged between the sealing members; and a water draining portion allowing the air chamber and an outside portion of the motor case to be communicated with each other.

An electric control system for an electric vehicle operable in a plurality of modes. The control system includes an electric motor having a plurality of motor coils, an energy storage device providing energy to the electric control system, transistor modules selectively coupling the electric motor to the energy storage device, a connector selectively coupling to an AC power source, a controllable switching device configured to selectively couple the connector to the electric motor; and a microcontroller controlling the switching device to couple the connector to at least one of the motor coils during a detected charging mode, and control one or more of the plurality of transistor modules to couple the motor coil to the energy storage device during the detected charging mode.

In one embodiment, an advanced electric propulsion system comprises: a housing; an electric motor within the housing; a motor drive coupled to the motor; a thermal management system comprising: a manifold-mini-channel heat sink integrated into the housing, the manifold-mini-channel heat sink comprises: an inlet manifold having air inlets formed in front of the housing; a set of plurality of circumferentially grooved micro-channels formed in the housing and coupled to the air inlets and conductively thermally coupled to stator windings of the electric motor; an outlet manifold having an air outlets formed at a back of the housing and coupled to the set of plurality of circumferentially grooved micro-channels; wherein the electric motor comprises PEW stator windings that provide a low thermal resistance path from the stator of the electric motor to the housing; wherein the PEW stator windings comprise a high temperature tolerant thermally conductive electrical insulator.

In one embodiment, an advanced electric propulsion system comprises: a housing; an electric motor within the housing; a motor drive coupled to the motor; a thermal management system comprising: a manifold-mini-channel heat sink integrated into the housing, the manifold-mini-channel heat sink comprises: an inlet manifold having air inlets formed in front of the housing; a set of plurality of circumferentially grooved micro-channels formed in the housing and coupled to the air inlets and conductively thermally coupled to stator windings of the electric motor; an outlet manifold having an air outlets formed at a back of the housing and coupled to the set of plurality of circumferentially grooved micro-channels; wherein the electric motor comprises PEW stator windings that provide a low thermal resistance path from the stator of the electric motor to the housing; wherein the PEW stator windings comprise a high temperature tolerant thermally conductive electrical insulator.

A drive device includes an electric motor and a gear unit that is driven by the electric motor. The electric motor has a laminated stator core which includes stator windings and is accommodated in a stator housing. The stator housing has recesses that are axially uninterrupted, i.e. in particular in the direction of the rotor shaft axis, and the stator housing is surrounded, especially radially surrounded, by a housing of the drive device, in particular a tubular housing and/or a cup-shaped housing, and the housing is set apart from the stator housing, in particular such that an especially circulating airflow is able to be provided within the housing, the recesses in particular guiding the airflow through in the axial direction, and the airflow being returned in the opposite direction in the set-apart region between the stator housing part and the housing.

A method for integrally manufacturing a stator core and a housing for an electrical machine includes printing, by a three-dimensional (3D) printing process, the stator core. In addition, the method includes printing, by the 3D printing process, the housing. In particular, printing the housing occurs contemporaneously with printing the stator core. The method also includes printing, by the 3D printing process, at least one end cap and coupling the at least one end cap to the housing to enclose a cavity defined by the housing.

A method for manufacturing a housing for an electrical machine includes printing, by a three-dimensional (3D) printing process, the housing. In addition, the method includes printing, by the 3D printing process, a cooling jacket that is integral with the housing. The method also includes printing, by the 3D printing process, at least one end cap configured to enclose a cavity defined by the housing. In addition, the method includes coupling the at least one end cap to the housing.