A motor system includes: a stator; a rotor; a motor shaft, which is mechanically coupled for conjoint rotation with the rotor, and which defines a radial direction and an axial direction of the motor system; heat-generating components, in particular power semiconductors; a control device which is designed to control an operation of the motor system; and a housing. The housing has a first central chamber, wherein the stator, the rotor and the heat-generating components are arranged inside the first chamber, and wherein the heat-generating components are connected to an outer wall of the first chamber, and has a number of second chambers, wherein the second chambers radially surround the first chamber, and wherein the second chambers form closed channels for guiding cooling air.

A motor system includes: a stator; a rotor; a motor shaft, which is mechanically coupled for conjoint rotation with the rotor, and which defines a radial direction and an axial direction of the motor system; heat-generating components, in particular power semiconductors; a control device which is designed to control an operation of the motor system; and a housing. The housing has a first central chamber, wherein the stator, the rotor and the heat-generating components are arranged inside the first chamber, and wherein the heat-generating components are connected to an outer wall of the first chamber, and has a number of second chambers, wherein the second chambers radially surround the first chamber, and wherein the second chambers form closed channels for guiding cooling air.

A gas turbine engine includes a turbine rotor connected to a main compressor rotor. A tail cone is mounted inward of an exhaust core flow. A generator rotor is adjacent a generator stator. The generator rotor and stator are mounted within the tail cone. A passage connects a bypass flow path to the tail cone. A cooling air compressor is operable within the passage. The turbine rotor drives a shaft to drive the generator rotor and the cooling compressor. A method is also disclosed.

A gas turbine engine includes a turbine rotor connected to a main compressor rotor. A tail cone is mounted inward of an exhaust core flow. A generator rotor is adjacent a generator stator. The generator rotor and stator are mounted within the tail cone. A passage connects a bypass flow path to the tail cone. A cooling air compressor is operable within the passage. The turbine rotor drives a shaft to drive the generator rotor and the cooling compressor. A method is also disclosed.

A work device including a cover provided on a base to form a work space between the cover and the base; a linear motor disposed in the work space having an extended stator and a movable element moving along the stator in a transfer direction; and a work executing section provided on the movable element to execute a predetermined work; wherein the movable element includes: a heat-dissipating section to dissipate heat generated from a constituent member to air, the constituent member constituting at least one of the movable element and the work executing section; a duct, covering the heat-dissipating section, having an intake port and an exhaust port; and a blower to blow the air from the intake port of to the exhaust port.

A work device including a cover provided on a base to form a work space between the cover and the base; a linear motor disposed in the work space having an extended stator and a movable element moving along the stator in a transfer direction; and a work executing section provided on the movable element to execute a predetermined work; wherein the movable element includes: a heat-dissipating section to dissipate heat generated from a constituent member to air, the constituent member constituting at least one of the movable element and the work executing section; a duct, covering the heat-dissipating section, having an intake port and an exhaust port; and a blower to blow the air from the intake port of to the exhaust port.

An electrical machine includes a rotor, which can be rotated about an axis of rotation, with which an axial direction is defined, and a stator having stator windings, a coolant distribution chamber and a coolant collecting chamber arranged axially at a distance thereto, the coolant distribution chamber fluidically communicates with the coolant collecting chamber for cooling the stator windings, a cooling duct and a stator winding are embedded in an electrically insulating plastic for thermal coupling, the stator has stator teeth which extend along the axial direction, are spaced apart from each other along a circumferential direction and bear the stator windings, the electrically insulating plastic is arranged together with the cooling duct and the stator winding in an intermediate space, and the electrically insulating plastic is formed by a first plastic mass of a first plastic material and by a second plastic mass of a second plastic material.

An electrical machine includes a rotor, which can be rotated about an axis of rotation, with which an axial direction is defined, and a stator having stator windings, a coolant distribution chamber and a coolant collecting chamber arranged axially at a distance thereto, the coolant distribution chamber fluidically communicates with the coolant collecting chamber for cooling the stator windings, a cooling duct and a stator winding are embedded in an electrically insulating plastic for thermal coupling, the stator has stator teeth which extend along the axial direction, are spaced apart from each other along a circumferential direction and bear the stator windings, the electrically insulating plastic is arranged together with the cooling duct and the stator winding in an intermediate space, and the electrically insulating plastic is formed by a first plastic mass of a first plastic material and by a second plastic mass of a second plastic material.

A synchronous electrical machine includes a stator having a circumferential row of teeth carrying stator windings. The electrical machine further includes a coaxial rotor having a circumferential row of poles carrying field windings. Each pole has first and second side flanks and a tip surface which extends continuously there between to form an air gap to the teeth of the stator. On a transverse cross-section through the machine, one of the side flanks forms a leading edge of the pole, and the other side flank forms an opposite, trailing edge of the pole. Each pole carries a row of permanent magnets which extends across the tip surface from one of the side flanks to the other side flank, the permanent magnets compensating for armature magnetic reaction. The radial thickness of the permanent magnets increases smoothly with progressive distance across the tip surface from one of the side flanks to the other side flank.

A synchronous electrical machine includes a stator having a circumferential row of teeth carrying stator windings. The electrical machine further includes a coaxial rotor having a circumferential row of poles carrying field windings. Each pole has first and second side flanks and a tip surface which extends continuously there between to form an air gap to the teeth of the stator. On a transverse cross-section through the machine, one of the side flanks forms a leading edge of the pole, and the other side flank forms an opposite, trailing edge of the pole. Each pole carries a row of permanent magnets which extends across the tip surface from one of the side flanks to the other side flank, the permanent magnets compensating for armature magnetic reaction. The radial thickness of the permanent magnets increases smoothly with progressive distance across the tip surface from one of the side flanks to the other side flank.