An air blower capable of suppressing movement of an impeller in a thrust direction is provided. A first case includes a first air inlet and a first air outlet. A second case includes a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet. An impeller is provided inside the second case. A motor rotates the impeller. A first flow channel is provided between the motor and the second case on the opposite side of the first air inlet and the second air inlet relatively to the impeller. A second flow channel is provided between the first case and the second case and communicates with the first flow channel, the first air inlet, and the second air inlet.

An air blower capable of suppressing movement of an impeller in a thrust direction is provided. A first case includes a first air inlet and a first air outlet. A second case includes a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet. An impeller is provided inside the second case. A motor rotates the impeller. A first flow channel is provided between the motor and the second case on the opposite side of the first air inlet and the second air inlet relatively to the impeller. A second flow channel is provided between the first case and the second case and communicates with the first flow channel, the first air inlet, and the second air inlet.

A turbo-machine arrangement having a compressor section comprising a compressor shaft, an electric machine having a shaft, the compressor shaft is coaxial to the shaft. The compressor shaft is coupled to the electric machine shaft. The electric machine and compressor section are arranged in a common housing and mounted via bearings. The housing having a supply line via which uncompressed working medium is supplied, a discharge line, via which compressed working medium is discharged, and an ejector, supplied via a first connection with working medium at a first pressure level for drawing in working medium at a lower second pressure level via a second connection. A mixture formed in the ejector is supplied to the electric machine and/or another assembly to be cooled via a third connection.

A turbo-machine arrangement having a compressor section comprising a compressor shaft, an electric machine having a shaft, the compressor shaft is coaxial to the shaft. The compressor shaft is coupled to the electric machine shaft. The electric machine and compressor section are arranged in a common housing and mounted via bearings. The housing having a supply line via which uncompressed working medium is supplied, a discharge line, via which compressed working medium is discharged, and an ejector, supplied via a first connection with working medium at a first pressure level for drawing in working medium at a lower second pressure level via a second connection. A mixture formed in the ejector is supplied to the electric machine and/or another assembly to be cooled via a third connection.

An electric motor system includes a drive shaft, first and second magnetic bearing portions facing each other and supporting the drive shaft, an electric motor to rotate the drive shaft, and a gap detection unit to detect a position of the drive shaft During rotation of the drive shaft, greater external force acts, on average, on the drive shaft in a first direction than in a second direction. The first and second direction extend from the second and first magnetic bearing portions to the first and second magnetic bearing portion. The first and second magnetic bearing portions produce first and second magnetic forces on the drive shaft in the first and second directions. A magnitude of the second magnetic force is greater than a magnitude of the first magnetic force. The gap detection unit is arranged closer to the second magnetic bearing portion than to the first magnetic bearing portion.

An electric motor system includes a drive shaft, first and second magnetic bearing portions facing each other and supporting the drive shaft, an electric motor to rotate the drive shaft, and a gap detection unit to detect a position of the drive shaft During rotation of the drive shaft, greater external force acts, on average, on the drive shaft in a first direction than in a second direction. The first and second direction extend from the second and first magnetic bearing portions to the first and second magnetic bearing portion. The first and second magnetic bearing portions produce first and second magnetic forces on the drive shaft in the first and second directions. A magnitude of the second magnetic force is greater than a magnitude of the first magnetic force. The gap detection unit is arranged closer to the second magnetic bearing portion than to the first magnetic bearing portion.

A ceiling fan having a dual redundant motor mounting assembly for suspending a motor comprising a downrod, a hollow motor shaft suspending the motor from the downrod, a retaining pin extending through the hollow motor shaft, and a retaining rod coupled to the retainer pin for redundantly suspending the motor.

A ceiling fan having a dual redundant motor mounting assembly for suspending a motor comprising a downrod, a hollow motor shaft suspending the motor from the downrod, a retaining pin extending through the hollow motor shaft, and a retaining rod coupled to the retainer pin for redundantly suspending the motor.

A blower includes a motor, a fan driven by the motor to rotate about a first axis, a power supply device, and a housing assembly accommodating the motor and including an inner duct and an outer duct assembly. The inner duct is formed with an inner air inlet. The outer duct assembly surrounds the inner duct. The outer duct assembly includes an outer duct and a hood, where the outer duct is disposed on a front side of the hood, an outer air outlet is formed at an end of the outer duct facing away from the hood, an outer air inlet is formed on the hood and has a front end portion and a rear end portion along a direction of the first axis, and the inner air inlet is disposed between the front end portion and the rear end portion along the direction of the first axis.

A hydrogen recirculation blower is used in a hydrogen return arrangement in a fuel cell system. The blower includes a rotatable rotor with an end region on which an impeller is arranged, and a stator with coil windings and with a hydrogen barrier which is formed as a hollow body. The rotor is arranged in a cavity of the hydrogen barrier, with the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings. The rotor and the stator form an electric motor for driving the impeller.