A closure system between the cap and the stator in an electric rotating machine, wherein the stator (1) comprises at least one closure hole (1a) defining an inner wall (1b). The cap (2) comprises at least one contact portion (2a), the end of the contact portion comprising at least one through-hole (2c); the through-hole (2c) being substantially aligned with the closure hole (1a) when the end of the contact portion (2a) contacts the stator (1); and wherein a polymer (P) is injected through the through-hole (2c) in the inner wall (1b) of the closure hole. In the closing process of the present invention, the concentricity between the rolling bearing and the stator rotor accommodating bore is ensured by the fact that the geometry of the rolling bearing receiving portion (2e) allows the alignment to be made on the basis of the outer race (E) of the rolling bearing when it is already accommodated in the receiving portion (2e).

A cap for a rotating electric machine, the cap comprising at least a rolling bearing receiving portion (2) for receiving a rolling bearing (R) having an outer race (E), the rolling bearing receiving portion (2) comprising a radially resilient central portion (3) configured to exert pressure on the outer race (E) of the rolling bearing.

A linear stepper motor includes a rotor, two plain bearings, two motor bearing shields, a spindle nut, and a fork-shaped actuating rod. The rotor has a rotor shaft that comprises a motive thread and is configured to drive a linearly guided actuator. The rotor shaft has plain bearing journals at ends thereof, which each comprise an end radially and axially enclosed in the plain bearings seated in the motor bearing shields, and, by the motive thread, axially drives the spindle nut connected with the fork-shaped actuating rod in a rotation-proof manner. The rotor shaft includes a flexurally and torsionally rigid plastic threaded spindle with coaxially arranged metallic shaft ends so as to act as metallic journals on opposite ends for concurrent plain bearing support and axial support.

The fan scrubber is provided with a casing having a gas draw-in port and a gas ejection port, a fan disposed in the casing, a nozzle from which a liquid is jetted into the casing, and a canned motor connected to the fan. The canned motor has a main shaft connected to the fan, a rotor which rotates integrally with the main shaft, a stator disposed on the periphery of the rotor, a motor casing in which the rotor and the stator are housed, and a can which partitions the interior of the motor casing into a rotor chamber in which the rotor is disposed and a stator chamber in which the stator is disposed.

An electric motor stator includes an armature surrounding a longitudinal opening for receiving a shaft, with longitudinal fins protruding from an outer surface of said armature; windings are wound within the armature and protruding beyond ends of the armature; and encapsulant seals the windings to the armature, such that the encapsulant serves as an outer housing for the windings.

An electric motor includes a stator; an annular end cap, fastened at a first end of the stator; a threaded seat that is mounted at an outward end face of the annular end cap for receiving a first gas foil thrust bearing; a shaft, inserted through the stator, through the annular end cap, and through the threaded seat; a thrust runner mounted at an end of said shaft adjacent the threaded seat; a first gas foil thrust bearing that is mounted into the threaded seat, adjacent a face of the thrust runner facing the stator; a bearing cap that has a threaded fitting by which it is attached onto the threaded seat; and a second gas foil thrust bearing that is mounted into the bearing cap adjacent to a face of the thrust runner opposite the first gas foil thrust bearing.

Certain aspects of the subject matter described here can be implemented in a downhole-type electric submersible pump system. An electric machine can be disposed downhole in a wellbore. The electric machine is coupled to rotate with an impeller that can be disposed downhole in the wellbore. The electric machine includes a stator assembly with at least three stator sections axially arranged and spaced apart from each other along a longitudinal axis of the electric machine. The electric machine also includes a rotor assembly with at least three rotor sections arranged axially along the longitudinal axis of the electric machine. The rotor assembly is carried within and supported to rotate by the stator assembly

An electric actuator assembly having a support housing, a first stator magnetic field generating assembly secured to the support housing and a movable armature assembly. The movable armature assembly includes a plate assembly having a center support. The electric actuator assembly also includes a first armature magnetic field generating assembly configured to provide magnetic fields operative with a first stator magnetic field generating assembly to provide linear motion of the movable armature assembly along a reference axis, the first armature magnetic field generating assembly including first and second magnetic assemblies secured to opposite sides of the center support. In another embodiment, the electric linear actuator includes a rotational component coupled to a linear component to move therewith. The rotational component includes an armature magnetic field generating assembly being one of longer or shorter than a stator magnetic field generating assembly.

An electric machine includes a housing, a driveshaft and a rotor which is mounted on the driveshaft. The driveshaft is supported on the housing by at least one rolling-contact bearing and in addition by an electrically-conductive slide bearing which also establishes an electric connection between the driveshaft and the housing.

An electric motor is provided including a stator and an armature rotatably received within the stator, the armature having an armature shaft on which a commutator is mounted. The motor also includes a brush assembly having a brush card mount disposed around the commutator, a brush holder mounted on a surface of the brush card mount, and a brush disposed within the brush holder in sliding contact with the commutator to supply electric current to the commutator. A torsion spring is secured to the brush card mount adjacent the brush holder, the spring having a leg arranged to engage the back surface of the brush. A spring stop post is disposed proximate an outer periphery of the brush card mount to limit an outward movement of the leg of the spring away from the back surface of the brush.