The invention relates to an electrical machine having a rotor (1), a stator (2) radially surrounding the rotor, and a housing (4) radially surrounding the stator. In order to minimize stresses in the housing and nonetheless decrease the tendency of the stator to torsional vibrations, the stator is connected to the housing at least at one end in a radially and torsionally rigid but axially movable manner, for example, by way of an axially compliant material area. The electrical machine can, in particular, be a motor spindle in a gear finishing machine.

A method of assembling an electric motor comprises axially translating a rotor of a rotor assembly in a first direction through a longitudinal bore of a stator, a first centering ring of the rotor assembly preventing a first end of the rotor from contacting an internal surface of the longitudinal bore; rotatably supporting a first end of the rotor assembly longitudinally extending from the rotor with a first support member; resting a second centering ring of the rotor assembly on the internal surface of the longitudinal bore; rotatably supporting a second end of the rotor assembly longitudinally extending from the rotor with a second support member; and axially translating the rotor assembly in a second direction, opposite the first direction, to place the rotor assembly in a position in which both the first centering ring and the second centering ring are outside the longitudinal bore.

A motor cooling structure, a drive assembly and a vehicle. The motor cooling structure includes: branch flow-channels (100), shell flow-channels (200), end cover flow-channels (300), a liquid inlet (201) and a liquid outlet (202). A plurality of the branch flow-channels (100) are circumferentially arranged on a stator (1) of a motor around an axis of the motor. The shell flow-channels (200) includes a liquid inlet flow-channel (211), shell long flow-channels and a liquid outlet flow-channel (212). The liquid inlet flow-channel (211), the plurality of shell long flow-channels and the liquid outlet flow-channel (212) are circumferentially arranged on a reducer shell (2) around the axis of the motor. The end cover flow-channels (300) includes end-cover long flow-channels, and a plurality of the end-cover long flow-channels are circumferentially arranged on a motor end cover (3) around the axis of the motor. The shell flow-channels (200), the plurality of branch flow-channels (100) and the end cover flow-channels (300) form a continuous total flow-channel. The liquid inlet (201) is disposed on the reducer shell (2), and is in communication with the liquid inlet flow-channel (211). The liquid outlet (202) is disposed on the reducer shell (2), and is in communication with the liquid outlet flow-channel (212). The motor cooling structure realizes immersion cooling of the motor and improves the cooling efficiency of the motor.

Provided is an embodiment of a motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed so as to face the motor; a housing for accommodating the stator; and a bus bar electrically connected to the stator, wherein the housing comprises a first stepped part on which at least a part of the bus bar is disposed.

Provided is a rotary electric machine including a stator including a plurality of stator pieces, a rotor being arranged inside the stator and rotating about a rotation axis, a housing holding the stator and the rotor, a lid member preventing the stator and the rotor from coming out of the housing, and a cylindrical frame forming the stator by containing the plurality of stator pieces and being internally mounted in the housing, in which a first fixing portion and a second fixing portion for fixing the frame to the housing are disposed at both end portions of the frame along an extending direction of the rotation axis.

A rotor position sensor for a motor vehicle for sensing the rotational position of a rotor of an electric motor includes a sensor housing, in which the components of the rotor position sensor are accommodated. At least part of the sensor housing forms a cover for closing a motor housing of the electric motor.

A steering reaction force apparatus for a vehicle includes: a housing that is openable and closable by a cover unit, a stator unit fixed to an inside of the housing, a rotor unit disposed to face the stator unit and to be rotated by electromagnetic interaction with the stator unit, a transmission shaft unit connected to the rotor unit to rotate in conjunction with the rotor unit, a power transmission unit disposed inside the rotor unit to transmit a rotational force of the transmission shaft unit to a steering shaft, and a retainer unit to support the power transmission unit with respect to the cover unit.

A compressor including a housing, and a motor including a stator to be interference fitted into and fixed to an inner circumferential surface of the housing and a rotor rotatable inside the stator. The stator includes an annular back yoke disposed inside the housing, a plurality of teeth extending radially inward from the back yoke, and a coil wound on the plurality of teeth. The back yoke includes a deformation portion compressed and deformed by the housing while the stator is interference fitted into the inner circumferential surface of the housing, a contact portion which protrudes radially outward from the deformation portion and being in contact with the housing, and a cavity formed on a radial inner side of the deformation portion into which the deformation portion is deformed.

A rotary reciprocating drive actuator includes: a movable body including a shaft portion and a magnet fixed to the shaft portion; a fixing body including a core assembly, the core assembly including a core body and coils, the core body having magnetic poles, the core assembly being disposed such that the magnetic poles face an outer periphery of the magnet; and a pair of shaft supports configured to sandwich the core assembly in an extending direction of extension of the shaft portion and support the shaft portion at opposite sides of the core assembly such that the shaft portion is rotatable, in which a magnetic flux passing through the core body is generated by energization of the coils, causing reciprocating rotation of the movable body about an axis of the shaft portion by electromagnetic interaction between the magnetic flux and the magnet.

A salient pole type hybrid excitation motor, belonging to the field of motors, and including a rotor assembly, where the rotor assembly includes: an electromagnetic rotor with radial salient poles and constructed in an annular shape and sleeving a magnetic yoke; a permanent magnet rotor installed on one side of the electromagnetic rotor; and axial salient pole blocks installed on one side of the permanent magnet rotor away from the electromagnetic rotor and arranged alternately with the radial salient poles, a plurality of axial salient pole blocks being matched with a plurality of radial salient poles of the electromagnetic rotor, and a polarity of the axial salient pole blocks being opposite to that of permanent magnet steels corresponding to the radial salient poles of the electromagnetic rotor. Electric excitation and permanent magnet excitation are combined to adjust an air gap magnetic field of a motor.