Provided is an axial gap type motor employing a non-rare earth magnet, and a water pump using same. The axial gap type motor for a water pump (EWP) comprises: a rotor rotatably supported on a fluid flow passage between a pump cover and a body case; a stator arranged in a lower space formed by the body case and an upper cover, so as to generate a rotating magnetic field, thereby rotating the rotor; and a partition arranged on the body case in order to separate the rotor from the stator. The rotor can use a ferrite magnet, which is a non-rare earth magnet.

This centrifugal blood pump apparatus includes an impeller (10) provided in a blood chamber (7), and a plurality of coils (20) provided in a motor chamber (8) for driving the impeller (10) to rotate with a dividing wall (6) interposed therebetween. A flexible substrate (23) in the shape of a strip is arranged to surround outer circumferences of the plurality of coils (20), and is connected to the plurality of coils (20) and a connector (24). A driving voltage (VU, VV, VW) is externally supplied to the plurality of coils (20) via the connector (24) and the flexible substrate (23). Thus, assembling workability, productivity and reliability are improved.

A mixing device with a stirring element includes a container (3) for receiving fluids and/or solids, at least one rotatable stirring element (100) for mixing the fluids and/or solids, at least one bearing element for the support of the stirring element (100). The stirring element (100) has at least one non-permanently magnetized element (118) so that the stirring element (100) can be put in a rotational movement by externally induced reluctance forces. A drive device having at least two pair of coils (208) through which current flows also is provided. A mixing device system includes the mixing device and the drive device. A method also is provided for driving a stirring element in a mixing device.

An electric water pump is configured to reduce an axial distance between a stator and a rotor. Since a separator of a stator casing is formed so as not to cover an upper surface of a stator, the axial thickness of the separator is reduced and the axial distance between the stator and the rotor is also reduced. The reduction in the axial distance allows a motor to have increased output and efficiency.

The system and method of the invention pertains to use of a back iron on one or both ends of the impeller to increase the magnetic field density, and thus strengthen the magnetic coupling. In addition, pie-shaped (i.e. wedge) magnets, or variations thereof, increase the utilization volume and hence provide higher torque to allow the use of less expensive material (e.g. ferrites). In another embodiment, the rotor side is constructed with a Halbach array which increases the torque without the need to add a back iron piece. In another embodiment, an axial flux stator is implemented to replace the drive-end magnets and the drive motor.

A circulation pump assembly, with a wet-running electrical drive motor (4), includes a pump casing (6) as well as a motor housing (22) which is connected to the pump casing (6). The motor housing (22) is a combined stator and electronics housing that accommodates a stator (18) of the drive motor (4) as well as motor electronics (34). The motor housing (22), at a first axial end (24) facing the pump casing (6), is closed by an air gap sleeve (16) of the drive motor. The motor housing (22), at a second axial end (26) which is away from the pump casing (6), includes an opening (42) closed by a cover (28). An interior of the motor housing (22), in a region adjacent the first axial end (24), is filled with a potting mass (40) surrounding the stator (18) and the motor electronics (34).

Systems and methods for producing hydrocarbons from a subterranean well include an electrical submersible pump assembly with a motor. The motor has a motor housing and a stator is located within the motor housing. The stator has a stator body with an interior cavity. A rotor assembly is located within the interior cavity of the stator. The rotor assembly includes a rotor shaft, a rotor member, and an intermediate rotor bearing assembly. The rotor member and the intermediate rotor bearing assembly circumscribe the rotor shaft. The rotor shaft extends along the central axis of the stator. A liner is located along an interior surface of the interior cavity, the liner being a thin walled member that is secured to the motor housing and seals the stator body from a wellbore fluid. The liner has a polygonal cross section.

A mixing device with a stirring element includes a container (3) for receiving fluids and/or solids, at least one rotatable stirring element (100) for mixing the fluids and/or solids, at least one bearing element for the support of the stirring element (100). The stirring element (100) has at least one non-permanently magnetized element (118) so that the stirring element (100) can be put in a rotational movement by externally induced reluctance forces. A drive device having at least two pair of coils (208) through which current flows also is provided. A mixing device system includes the mixing device and the drive device. A method also is provided for driving a stirring element in a mixing device.

The system and method of the invention pertains to an axial flux stator is implemented to replace the drive-end magnets and the drive motor. The axial flux stator comprises a control circuit to control the voltage and current provided to the stator, to measure the torque and speed of rotation, and to measure the magnetic flux and magnetic flux density produced by the axial flux stator and impeller magnets, individually or in combination. The axial flux stator comprises a plurality of current carrying elements to produce magnetic flux in an axial direction and drive the impeller.

A stator assembly includes a stator that drives a rotor rotatable about a central axis extending in a vertical direction, a cover that accommodates the stator, a filling portion that fills a space between the cover and the stator. The cover includes a tubular portion that extends in an axial direction and covers a radially side portion of the stator opposing the rotor in a radial direction, a lid portion that covers an axially upper end portion of the stator, and a cover stepped portion that is provided on a first radial side with respect to the tubular portion. The cover stepped portion comes in contact with the axially upper end portion of the stator and is positioned on an axially lower side with respect to an axially upper end portion of the tubular portion.