The invention relates to an electric machine which is cooled or can be cooled by a fluid, comprising a rotor, a stator, and at least one end disk which are arranged in a housing, where the end disk and the rotor are arranged on a shaft, in particular a hollow shaft, and the end disk is arranged on at least one axial end of the rotor, where at least one first fluid region is formed between a first face side of the end disk and at least one axial end of the rotor and a second fluid region between a second face side of the end disk and the housing, where the two fluid regions comprise at least one outer fluid connection and at least one inner fluid connection which each connect the two fluid regions to one another such that the fluid can circulate at least in sections between the first and the second fluid region.

The invention relates to an electric machine which is cooled or can be cooled by a fluid, comprising a rotor, a stator, and at least one end disk which are arranged in a housing, where the end disk and the rotor are arranged on a shaft, in particular a hollow shaft, and the end disk is arranged on at least one axial end of the rotor, where at least one first fluid region is formed between a first face side of the end disk and at least one axial end of the rotor and a second fluid region between a second face side of the end disk and the housing, where the two fluid regions comprise at least one outer fluid connection and at least one inner fluid connection which each connect the two fluid regions to one another such that the fluid can circulate at least in sections between the first and the second fluid region.

Provided is a method for controlling the cold gas temperature of a cooling gas of a closed generator cooling gas circuit of a generator having at least one cooler through which a cooling fluid flows. The method includes: a) defining cold gas temperature setpoint values in dependence on the stator and rotor current of the generator; b) detecting the current cold gas temperature; c) detecting the current stator and rotor current; d) determining the cold gas temperature setpoint value associated with the stator and rotor current detected in step c); e) regulating the cold gas temperature by changing the volumetric flow of the cooling fluid supplied to the at least one cooler as a function of the difference between the current cold gas temperature detected in step b) and the cold gas temperature setpoint value determined in step d); and f) repeating steps b) to e) at defined time intervals.

Provided is a method for controlling the cold gas temperature of a cooling gas of a closed generator cooling gas circuit of a generator having at least one cooler through which a cooling fluid flows. The method includes: a) defining cold gas temperature setpoint values in dependence on the stator and rotor current of the generator; b) detecting the current cold gas temperature; c) detecting the current stator and rotor current; d) determining the cold gas temperature setpoint value associated with the stator and rotor current detected in step c); e) regulating the cold gas temperature by changing the volumetric flow of the cooling fluid supplied to the at least one cooler as a function of the difference between the current cold gas temperature detected in step b) and the cold gas temperature setpoint value determined in step d); and f) repeating steps b) to e) at defined time intervals.

In some aspects, the techniques described herein relate to a refrigerant compressor, including: an impeller; a shaft; a motor configured to rotate the impeller via the shaft, wherein the motor includes a stator and a rotor; and a housing surrounding the motor, wherein the housing includes a first inlet configured to permit fluid to enter the housing and flow along a stator cooling line and a second inlet configured to permit fluid to enter the housing and flow a rotor cooling line, and wherein the first inlet is separate from the second inlet.

An axial field rotary energy device can include a rotor comprising an axis of rotation and a magnet. In addition, a stator can be coaxial with the rotor. The stator can include a plurality of stator segments that are coupled together about the axis. Each stator segment can include a printed circuit board (PCB) having a PCB layer comprising a coil. Each stator segment also can include only one electrical phase. The stator itself can include one or more electrical phases.

An axial field rotary energy device can include a rotor comprising an axis of rotation and a magnet. In addition, a stator can be coaxial with the rotor. The stator can include a plurality of stator segments that are coupled together about the axis. Each stator segment can include a printed circuit board (PCB) having a PCB layer comprising a coil. Each stator segment also can include only one electrical phase. The stator itself can include one or more electrical phases.

A generator, a heat exchange device for a shaft system thereof, and a wind turbine are provided. The heat exchange device includes a flexible cavity for allowing a cooling medium to input. The flexible cavity is located on an inner wall of the generator rotation shaft, and is cooled by a generator bearing in the generator shaft system. After the cooling medium is injected into the flexible cavity, the cooling environment can be created at the inner wall position of the generator rotation shaft so as to provide a heat-dissipation channel for the generator bearing enclosed between the generator rotation shaft and a generator fixed shaft, thereby achieving good cooling effect.

A generator, a heat exchange device for a shaft system thereof, and a wind turbine are provided. The heat exchange device includes a flexible cavity for allowing a cooling medium to input. The flexible cavity is located on an inner wall of the generator rotation shaft, and is cooled by a generator bearing in the generator shaft system. After the cooling medium is injected into the flexible cavity, the cooling environment can be created at the inner wall position of the generator rotation shaft so as to provide a heat-dissipation channel for the generator bearing enclosed between the generator rotation shaft and a generator fixed shaft, thereby achieving good cooling effect.

An electric machine includes a frame and a plurality of electrical components including a rotor assembly and a stator assembly. The electric machine further includes an auxiliary blower mounting arrangement for cooling the electrical components and/or a modular exhaust assembly for noise attenuation, wherein the modular exhaust assembly further has one or more louvers allowing cooling fluid for cooling the electrical components to exit the electric machine.