An electrical submersible pump assembly includes a motor having a stator with a bore extending along a longitudinal axis. A shaft with axially spaced apart rotor sections extends longitudinally through the bore. At least one lubricant pump is mounted to the shaft within the bore for circulating motor lubricant within the bore. A bearing carrier has an inner diameter in sliding engagement with an outer diameter of the lubricant pump. An anti-rotation member on an outer diameter of the carrier is in engagement with the bore of the stator to prevent rotation of the carrier.

A low-loss motor may include a casing, a rear cover, and a rotatable shaft. The rotatable shaft may have a first end contacting the rear cover and a second end. An end face of the first end of the rotatable shaft may have a first shape and a contact surface of the rear cover may have a second shape, the second shape being different than the first shape.

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 motor includes a rotor, a stator having coils, a connector for supplying electrical power to the coils, and a resin sealing member. The resin sealing member comprises an opposite-to-output side sealing part and a connector sealing part covering the connector. The connector comprises a frame part into which the cable side connector is to be inserted, and the opposite-to-output side sealing part comprises a first protruded part and a second protruded part. A tip end face of the first protruded part and a tip end face of the second protruded part are located on one imaginary face intersecting the rotation center line, a tip end on the opposite-to-output side of the frame part is located on the output side with respect to the imaginary face, and the second protruded part is provided at a position closer to the frame part between the first protruded part and the frame part.

A motor includes a connector detachably connected with an external cable and a resin sealing member which covers the connector. The connector includes a frame part into which a cable side connector is to be inserted and a step part on an outer peripheral face of the frame part. A shape of the step part when viewed in the inserting direction is a ring shape. The resin sealing member covers the connector from the front side and exposes an end face of the step part of the frame part and a portion of the frame part on the rear side to the step part end face to the outside, and an outer peripheral face of the resin sealing member is provided with an outer peripheral face portion which surrounds the frame part and is continuously connected with the step part end face without a step.

An alternating-current permanent magnet drainage pump includes a pump cover, a pump body, a magnetic core, a rotating shaft, a stator core and coils. The coils are wound around a coil former, and the stator core is assembled to the coils. The pump body is a shell formed by surrounding a contour of the coils, the coil former, and the stator core which have been assembled to perform an integrated injection molding. The shell defines a magnetic core accommodating space used for accommodating the magnetic core and having an opening at a top portion. The magnetic core accommodating space extends from the opening to a center of the pump body. A supporting member is arranged in the opening at the top portion of the magnetic core accommodating space for supporting a bearing of the rotating shaft.

Provided is a geared motor with which a large torque can be obtained without an increase in size. In this geared motor (1), an output member (8) having a helical groove (83) formed in an outer circumferential section is provided between a first plate part (31) and a second plate part (32) of a frame (3), and the rotation of a motor pinion (55) fixed to a rotary shaft (50) is reduced in speed by transmission gears of a reduction gear mechanism (9) and is transmitted to a gear part (85) of the output member (8). Thus, a large torque can be output, even when the gear part (85) of the output member (8) is made smaller than the outer diameter of the section (84) provided with the helical groove (83). Also, even when a gear cover (7) is provided, a lateral plate part (72) of the gear cover (7) covering the outer circumferential section of the gear part (85) of the output member (8) is located close to the rotation center axis of the output member (8). Thus, it is possible to prevent the geared motor (1) from being increased in size by the gear cover (7).

A motor bearing system has: a slide bearing operable as a gas-lubricated bearing by a pump; a rolling bearing; a switching mechanism switching between the slide bearing and the rolling bearing; and a controller. The controller sets the switching mechanism to make the rolling bearing function when a motor rotation speed is lower than a first speed, and sets the switching mechanism to make the slide bearing function and controls the pump, so as to operate the slide bearing as a gas-lubricated bearing when the pump is normal and the motor rotation speed is equal to or higher than the first speed. In the case where the pump is abnormal, the controller sets the switching mechanism to make the rolling bearing function, and restricts the motor rotation speed to be lower than a predetermined speed even when the motor rotation speed is equal to or higher than the first speed.

A motor bearing system has: a slide bearing operable as a gas-lubricated bearing by gas supplied from a pump; a rolling bearing; a switching mechanism switching between the slide bearing and the rolling bearing; and a controller. When a motor rotation speed is lower than a first speed, the controller controls the switching mechanism to apply the rolling bearing. When the motor rotation speed is equal to or higher than the first speed and lower than a second speed, the controller controls the switching mechanism to apply the slide bearing and controls the pump to operate the slide bearing as a gas-lubricated bearing. When the motor rotation speed is equal to or higher than the second speed, the controller controls the switching mechanism to apply the slide bearing and stops the pump.

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.