An electric motor including a tension member is proposed. The electric motor includes the tension member installed therein and composed of step parts stacked in multiple steps, so that structural strength and structural robustness are improved.

A rotary electric machine includes an enclosure delimiting an internal space for stator and rotor units. An access hole gives access to the internal space. An internal gasket encircles the access hole adjacent a wall of the enclosure. A closing element is disposed in the internal space, movable towards and away from the wall between a closed configuration compressing the gasket to seal the access hole and an open configuration connecting the internal space with the surrounding atmosphere. An elastic device operates to move the closing element from the open to closed configurations to compress the gasket and seal the access hole. The closing element has a pressure surface facing the access hole and accessible through the access hole via a pin. Pressing the pressure surface causes the closing element to move from the closed configuration to the open configuration.

An apparatus for generating acoustic waves within a medium to stimulate oil recovery within an oil reservoir. The apparatus is operable with a single moving part—a central rotor, and the rotor further includes a “conduit” through which the supply fluid passes.

A compressor has: a motor that has a stator provided around an axis of a rotor; a rotating shaft that is fixed to the rotor; a bearing that supports the rotating shaft; an impeller that is connected to the rotating shaft and compresses fluid; and a casing that accommodates the motor. In this compressor, the stator has: a coil that encircles the axis of the rotor; and a stator core that has a magnetic pole facing, in a radial direction of the rotor, an outer circumferential surface of the rotor, via a gap.

An electric motor including a tension member is proposed. The electric motor includes the tension member installed therein and composed of step parts stacked in multiple steps, so that structural strength and structural robustness are improved.

An inner-rotor motor including: an armature assembly including a rotating shaft, an armature unit coupled to the rotating shaft and a pressing unit; a frame assembly including a frame housing the armature unit, a first bearing unit located on one side with respect to the armature unit in an axial direction, and a second bearing unit located on another side with respect to the armature unit in the axial direction; and an urging structure that urges the rotating shaft in a direction away from the second bearing unit and that presses the pressing unit toward the first bearing unit.

A rotor assembly of a water pump is provided including a rotor body, an upper bearing, a lower bearing, a magnet, an impeller, and a shaft. The rotor assembly also includes a rotor shaft core that ensures concentricity of the upper bearing, the lower bearing, the magnet, and the shaft. The present disclosure also provides a manufacturing method that involves overmolding the rotor body onto the rotor shaft core to encapsulate the magnet.

The electric machine includes a shaft, a rotor, a stator, and a frame. The shaft is supported rotatably on the frame with an axially locating sleeve bearing at each axial end of the shaft. The axial play limiting the axial movement of the shaft is greater in one of the two axially locating sleeve bearings compared to the axial play in the other of the two axially locating sleeve bearings. An axial movement of the shaft is limited only by the bearing with the smaller axial play during normal operational circumstances and by both bearings during exceptional events, the bearing with the greater axial play reducing the axial load of the first bearing in such exceptional events.

In one aspect, an improved electric transmission assembly is provided that includes a hydrodynamic bearing. The electric transmission assembly includes a stator arranged inside of an outer housing. A rotor is configured to be rotatably driven by the stator. The rotor can include a rotor shaft having a first gear configured to driveably engage with a differential. A hydrodynamic bearing is arranged between the rotor shaft and the outer housing. The hydrodynamic bearing is formed from a non-conductive material. Specifically, the hydrodynamic bearing can be formed from a polymeric or plastic material. In one aspect, the hydrodynamic bearing is formed from a non-metallic material.

A multiphase pump for conveying a multiphase process fluid includes a pump housing, a rotor and a radial bearing. The rotor is arranged in the pump housing and is configured to rotate about an axial direction. The radial bearing has a support carrier and a support structure to support the rotor with respect to a radial direction. The rotor includes a pump shaft and an impeller fixedly mounted on the pump shaft to convey the process fluid from a pump inlet to a pump outlet. A squeeze film damper is provided to reduce vibrations of the rotor, the squeeze film damper arranged around the support structure of the radial bearing, and having an radially outer surface. A damping gap is arranged between the support structure of the radial bearing and the radially outer surface of the squeeze film damper. The damping gap is configured to receive a damping fluid.