Turbomachine (10), in particular for a fuel cell system (1). The turbomachine (10) comprises a compressor (11), a drive device (20) and a shaft (14). The compressor (11) has a rotor (15) arranged on the shaft (14), a compressor inlet (11a) and a compressor outlet (11b). A working fluid can be delivered from the compressor inlet (11a) to the compressor outlet (11b). A drive cooling path (92) for cooling the drive device (20) branches off at the compressor outlet (11b). Also proposed is a fuel cell system (1) with a turbomachine (10) according to the invention, a method for operating the turbomachine (10) and a method for operating the fuel cell system (1).

Disclosed herein is an air compressor. The air compressor may include: a compressor unit including a front housing having a front inlet and a compressor scroll, and a compressor impeller configured to transfer the air drawn through the front inlet toward the compressor scroll; a motor unit including a motor housing coupled with the front housing, a stator disposed along an inner circumferential surface of the motor housing, and a rotor disposed to pass through the stator and coupled with the compressor impeller by a rotating shaft; a turbine unit including a rear housing coupled with the motor housing, a turbine impeller coupled with the rotating shaft, and a turbine blower formed in the rear housing and configured to exhaust air that has passed through the turbine impeller to the outside; and an air cooling unit coupled with the compressor scroll to cool the stator and the rotating shaft.

A bearing housing for a two-wheel air cycle machine includes a first housing portion, a second housing portion, a third housing portion, and a journal bearing bore. The first housing portion is centered around an axis and has a first side and a second side. The second side is positioned axially away from the first side. The second housing portion is centered around the axis and has a first side and a second side. The second side is positioned axially away from the first side. The first side of the second housing portion connects to the second side of the first housing portion. The third housing portion is centered around the axis and has a first side and a second side. The second side is positioned axially away from the first side. The first side of the third housing portion connects to the second side of the second housing portion. The journal bearing bore is centered axially with in the bearing housing and has a diameter of D.sub.1.

A system and modular compressor for raising the pressure in production gas is disclosed, wherein in a set of compressor modules each second module is a rotor module carrying an impeller driven in rotation relative to an adjacent stationary module, a rotor module and a stationary module in combination providing a compressor stage in which production gas is accelerated through a flow duct that passes an interface between the rotor module and the stationary module, wherein at the interface at least one bearing for axial and/or radial load is provided for journaling the rotor module on the stationary module. The at least one bearing is a gas bearing, wherein a passage is arranged in the stationary module to lead an extracted portion of production gas at raised pressure from the compressor to the gas bearing(s).

A method of controlling, by a controller for a compressor (200), pressure at plurality of magnetic motor thrust bearings (360, 370) for a motor (280) disposed within a housing (220) for the compressor (200), wherein the motor (280) and an impeller (270) are disposed on a compressor shaft (260) within the housing, the method including: monitoring current at each of the plurality of magnetic motor thrust bearings (360, 370), controlling a flow regulator (400) in a bypass loop (380) for the impeller (270) to decrease flow through the bypass loop when a first current in a first of the plurality of magnetic motor thrust bearings (360, 370) exceeds a second current in a second of the plurality of magnetic motor thrust bearings (360, 370), and controlling the flow regulator (400) to increase flow through the bypass loop (380) when the second current exceeds the first current.

A heating, ventilation and air conditioning system including a two-stage, high speed fluid compressor including a case having a fluid inlet and a compressed fluid outlet and containing a shaft rotatably mounted about a longitudinal axis, a first compression wheel and a second compression wheel mounted back-to-back on the shaft, the first compression wheel forming a first compression stage and the second compression wheel forming a second compression stage, and a motor positioned between the first compression wheel and the second compression wheel and arranged to rotate the shaft. The case includes a through inner housing inside which is arranged at least the motor, the inner housing having an internal wall arranged to form, with the motor, channels between at least the inner wall and the motor, the channels allowing the motor to be cooled on contact with fluid.

A motor includes a rotor having an output shaft and a rotor main body, a bearing member for supporting the output shaft movable in an axial line direction and rotatable around the axial line, and a bearing holding member holding the bearing member. The bearing member has a tube part supporting the output shaft and a slidably contacting part capable of slidably contacting with the rotor main body. The bearing holding member has an opposed face facing the rotor main body and a recessed part provided in the opposed face. The tube part of the bearing member is inserted into the recessed part and is separated from a bottom face of the recessed part. A space between the bottom face of the recessed part and the tube part is structured as a lubricant storage part and a communication path is provided between the bearing holding member and the bearing member.

A compressor according to an embodiment of the present disclosure includes: one or more impellers configured to draw in a refrigerant in an axial direction and to compress the refrigerant in a centrifugal direction; a rotating shaft, to which the impellers and a motor rotating the impellers are coupled; a thrust bearing supporting the rotating shaft; a bearing state sensor configured to detect surface roughness of the thrust bearing; and a controller configured to control the motor based on the surface roughness of the thrust bearing.

A compressor is provided. The compressor according to the present disclosure includes: one or more impellers suctioning and compressing refrigerant; a motor rotating the impeller; a rotation shaft to which the impeller and the motor are connected; a gap sensor measuring a displacement change of the rotation shaft as a frequency change; a temperature compensation sensor determining a frequency compensation value according to a temperature change around the gap sensor; and a control unit calculating a displacement amount of the rotation shaft by reflecting the frequency compensation value provided by the temperature compensation sensor and the frequency change measured by the gap sensor.

A compressor device includes a motor cooling system that provides a first flow of a first fluid through a housing for cooling a motor. The motor cooling system includes a first fluid flow section at a first axial position. The first fluid flow section extends in a downstream direction radially with respect to the axis of rotation. Also, the device includes a bearing cooling system that provides a second flow of a second fluid through the housing for cooling the bearing. The bearing cooling system includes a second flow section at a second axial position that is spaced apart axially from the first axial position. The second flow section extends in a downstream direction radially with respect to the axis of rotation. The first flow section and the second flow section are disposed in a heat exchanger arrangement configured to transfer heat between the second fluid and the first fluid.