Abstract: A fluid machine includes a bladed wheel, a resolver, a first fastener, and a second fastener. A resolver rotor is held between the first fastener and the rotary shaft and fixed to a large-diameter portion of the rotary shaft. The bladed wheel is held between the second fastener and the rotary shaft and fixed to a small-diameter portion of the rotary shaft. While the resolver rotor is fixed by the first fastener in a same direction as the bladed wheel is fixed by the second fastener along an axial direction of the rotary shaft, and the resolver rotor is fixed by the first fastener at a position away in a radial direction of the rotary shaft from a position where the bladed wheel is fixed by the second fastener so that the resolver rotor does not receive an axial force from the second fastener.

Abstract: A turbo fluid machine includes a housing, a rotating member, and a motor. Part of fluid compressed by a compressor impeller is introduced into a motor accommodation space through an inlet-side flow passage that has an inlet-side fixed throttle, and is discharged from the motor accommodation space through an outlet-side flow passage that has an outlet-side fixed throttle. The outlet-side flow passage includes a connection part connecting to the motor accommodation space. The connection part is formed separately from a clearance between a second partition wall and a shaft, and is located opposite to a connection part of the inlet-side flow passage connecting to the motor accommodation space across the motor in an axial direction of the shaft. The inlet-side fixed throttle and the outlet-side fixed throttle are configured such that pressure in the motor accommodation space is higher than pressure in a turbine-wheel back pressure region.

Abstract: A fuel cell system includes a target pressure value for the pressure in a fuel cell is set depending on a demand output value to the fuel cell. A turbine retains a set pressure line representing a relationship between an airflow rate supplied to the turbine and a pressure ratio corresponding to a ratio of a pressure upstream of the turbine and a pressure downstream of the turbine. A controller executes a first control when the target pressure value for the fuel cell is lower than the set pressure line and executes a second control when the target pressure value for the fuel cell is higher than the set pressure line. The controller controls an outlet valve so as not to be fully opened when a turbine bypass valve is fully closed.

Abstract: A fluid machine includes a bladed wheel, a resolver, a first fastener, and a second fastener. A resolver rotor is held between the first fastener and the rotary shaft and fixed to a large-diameter portion of the rotary shaft. The bladed wheel is held between the second fastener and the rotary shaft and fixed to a small-diameter portion of the rotary shaft. While the resolver rotor is fixed by the first fastener in a same direction as the bladed wheel is fixed by the second fastener along an axial direction of the rotary shaft, and the resolver rotor is fixed by the first fastener at a position away in a radial direction of the rotary shaft from a position where the bladed wheel is fixed by the second fastener so that the resolver rotor does not receive an axial force from the second fastener.

Abstract: A fuel cell system includes a target pressure value for the pressure in a fuel cell is set depending on a demand output value to the fuel cell, A turbine retains a set pressure line representing a relationship between an airflow rate supplied to the turbine and a pressure ratio corresponding to a ratio of a pressure upstream of the turbine and a pressure downstream of the turbine. A controller executes a first control when the target pressure value for the fuel cell is lower than the set pressure line and executes a second control when the target pressure value for the fuel cell is higher than the set pressure line. The controller controls an outlet valve so as not to be fully opened when a turbine bypass valve is fully closed.

Abstract: A turbo fluid machine includes a housing, a rotating member, and a motor. Part of fluid compressed by a compressor impeller is introduced into a motor accommodation space through an inlet-side flow passage that has an inlet-side fixed throttle, and is discharged from the motor accommodation space through an outlet-side flow passage that has an outlet-side fixed throttle. The outlet-side flow passage includes a connection part connecting to the motor accommodation space. The connection part is formed separately from a clearance between a second partition wall and a shaft, and is located opposite to a connection part of the inlet-side flow passage connecting to the motor accommodation space across the motor in an axial direction of the shaft. The inlet-side fixed throttle and the outlet-side fixed throttle are configured such that pressure in the motor accommodation space is higher than pressure in a turbine-wheel back pressure region.

Abstract: A turbomachine includes a housing, an impeller, a shaft, and first and second radial foil bearings that rotationally support the shaft. The motor includes a stator and a rotor. The shaft includes a first inner ring and a second inner ring. The first inner ring is formed integrally with the shaft as a part of the shaft. The second inner ring is formed separately from the shaft. The first inner ring includes a first opposed end portion that is opposed to a first end portion of the rotor. The second inner ring includes a second opposed end portion that is opposed to a second end portion of the rotor. The second opposed end portion is fixed to the shaft such that the second opposed end portion and the first opposed end portion hold the rotor in between to apply preload in an axial direction to the rotor.

Abstract: A centrifugal compressor includes a housing, a rotary shaft accommodated in the housing, an electric motor including a motor rotor and a motor stator for rotating the rotary shaft, an impeller connected to one end of the rotary shaft and driven by rotation of the rotary shaft so as to compress fluid, a radial bearing rotatably supporting the rotary shaft in a radial direction of the rotary shaft, and a resolver including a resolver rotor and a resolver stator for detecting a rotation angle of the motor rotor. The resolver rotor is fixed to the other end of the rotary shaft opposite to the impeller. The rotary shaft includes a radial support member rotatably supported by the radial bearing, and a radius of the radial support member is larger than a radius of gyration of the resolver rotor.

Abstract: A fuel cell system includes a bypass passage, a flow path selector portion that selects a flow path of oxidation gas, and a valve opening adjusting portion that adjusts an opening of a pressure adjusting valve. Until a rotation speed of a rotary shaft reaches a separation rotation speed at which the rotary shaft is separated from an aerodynamic bearing, the flow path selector portion permits flow of the oxidation gas from an electric compressor to a fuel cell stack through a supply passage and flow of the oxidation gas from the electric compressor to a discharge passage through the supply passage and the bypass passage, and the valve opening adjusting portion adjusts the opening of a pressure adjusting valve so that an efficiency of a turbine is maximized by the discharge gas.