Systems and methods for fitting a sleeve to a rotor. The method includes fitting a seal to a first end of the sleeve portion to create a fluid-tight seal between the sleeve portion and that seal, introducing fluid into the sleeve portion, axially moving the rotor inside the sleeve portion towards the first end, and increasing the pressure of the fluid in the sleeve portion to radially expand the sleeve portion and thereby accommodate the rotor within the sleeve portion as it moves towards the first end. The apparatus includes a sleeve having a sleeve portion, a rotor, and a seal at a first end of the sleeve portion. The seal at the first end creates a fluid-tight seal. An interference fit may exist between the rotor and the sleeve portion such that the sleeve portion radially supports magnets on the rotor when it is fitted around the rotor.

Systems and methods are provided for a coated lamination layer for an electric motor. The coated lamination layer includes a lamination layer base of annular shape defined by an inner edge and an outer edge with a plurality of radially arranged slot openings and a plurality of radially arranged channel openings, and a sealing layer protruding from a surface of the lamination layer base, wherein the sealing layer is a screen-printed coating. The coated laminations layers are stacked into a stator with the sealing layers sealing regions between the lamination layer bases.

A magnetizing method applies, to a rotor including a plurality of magnetic bodies that are arranged in the circumferential direction of the rotor and are to be magnetized, a magnetic field in a radial direction of the rotor to magnetize the magnetic bodies. The magnetizing method includes a step of arranging a magnetizing coil near the outer peripheral portion of the plurality of magnetic bodies and a step of applying a radially outward magnetic field only to one of the magnetic bodies while applying radially inward magnetic fields to the plurality of magnetic bodies.

Disclosed is a multi-process-step stator manufacturing device, including a first frame and a second frame that are arranged side by side, where the first frame is provided with a turntable, a press machine, a welding assembly and an ejecting assembly, and the second frame is provided with two frame slide rails, a connecting and handling module, a marking assembly, an air shower assembly, two axial handling assemblies, a detection assembly, an oil injection assembly, and a discharging assembly. The apparatus of the present disclosure combines processes of press fitting, welding, marking, air showering, detecting, and injecting oil, and realizes automatic operation and processing according to each process, thereby improving processing efficiency and ensuring stator processing quality.

An axial flux stator core (50) and a manufacturing thereof is proposed. The axial flux stator core (50) has a spirally layered structure (24), wherein the axial flux stator core (50) comprises a metal strip (14) having a longitudinal first side (16) and a longitudinal second side (18) and that is wound to form the spirally layered structure (24). The first side (16) of the metal strip (14) has a plurality of slots (20) having a slot width that vary along the metal strip (14), the first side (16) forms a plurality of stator teeth (26), the slots (20) define a tooth separation between each pair of neighboring stator teeth (26), and the second side (18) forms an annular stator yoke (28) connecting the stator teeth (26).

The invention relates to a stator (ST) for an electric machine (EM) of an at least partially electrically driven motor vehicle (KFZ), comprising

an annular yoke (JO) with an inner side (IS) oriented inward in the radial direction, and a stator tooth (SZ), which is positively connected to the yoke (JO) and has a tooth shank (ZS) and a tooth head (ZK) adjoining the tooth shank (ZS), characterized in that a connecting projection (VV) oriented inward in the radial direction is formed on the inner side (IS) of the yoke (JO), and a connecting recess (VA) is formed on an end face (SS) of the tooth shank (ZS) that is formed on a side facing away from the tooth head (ZK), and, to obtain the positive connection, the connecting projection (VV) engages at least partially and/or in some portion or portions in the connecting recess (VA).

There are provided a laminated iron core, a manufacturing method thereof, and a progressive die machine, in which the laminated iron core includes: a plurality of iron core pieces which are laminated; adhesives that bond the iron core pieces adjacent to each other. Each of the iron core pieces includes an annular yoke portion and a plurality of teeth portions projecting radially from the yoke portion. Each of the adhesives is arranged at a different radial distance from a central axis of the iron core pieces and is evenly arranged in a circumferential direction of the iron core pieces on at least one of the entire yoke portion and the entire teeth portions.

Improved rotor module balancing approaches are disclosed. For example, a rotor module may be configured to be concentrically disposed on a drive shaft of an ESP motor, and may include an active length, as well as a plurality of pockets which each can extend axially into the active length and be configured to retain one of a plurality of balance masses. Such exemplary rotor modules may be balanced by determining a direction and a mass amount representing unbalance of the rotor module; based on that determination, determining specific pockets for receiving the balance masses and the amount of each corresponding balance mass; and inserting the balance masses into the corresponding pockets. Such an approach may allow for quick and efficient rotor balancing, while minimizing length of the rotor module and/or maximizing the ratio of active length versus total length of the rotor module.

A rotor assembly is configured to rotate relative to a stator to drive a rotor shaft and at least one drive wheel of an electric vehicle. The rotor assembly includes a rotor core, and first and second bar assemblies. The rotor core includes a core body that defines a plurality of circumferentially arranged bar passages including a plurality of first bar passages and a plurality of second bar passages. The first bar assembly includes a plurality of first bars, each of the first bars having a first elongated blade portion and a first end body portion. The second bar assembly includes a plurality of second bars, each of the second bars having a second elongated blade portion and a second end body portion. the first bars and the second bars are alternately received at the respective plurality of first bar passages and second bar passages in the core body.

A method for forming a dynamoelectric machine including providing a jig, arranging an inner yoke and an outer yoke on the jig, providing concentrically arranged rotor layers between the inner yoke and the outer yoke, filling spaces between adjacent ones of the concentrically arranged rotor layers with a powder which will define stator layers, pressing the powder within the spaces between the adjacent ones of the concentrically arranged rotor layers, and heating, sintering, and/or curing the pressed powder to form the stator layers between the adjacent ones of the concentrically arranged rotor layers.