A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.

A rotor assembly for a permanent magnet motor includes a rotor stack of laminated ferromagnetic layers and partial end plates at opposite axial ends of the rotor stack wherein each axial end of the rotor bears two partial end plates, each of which covers a partial circle and does not axially overlap with the other one of the partial end plates at the same axial end. The two partial end plates of each axial end are formed by a first axial end plate shaped as a first partial ring disc and a second partial end plate shaped as a second partial ring disc that are made of stamped metal and that are of different mass.

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 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.

The present application relates to an electric machine splitting or assembling method, an electric machine assembling method, and an electric machine splitting or assembling device including a sleeving device separating or coaxially sleeving first and second rotary bodies; the first disassembly device fixes the first rotary body and includes at least two first separable portions, and the first rotary body is split into petals in a circumferential direction by disassembling the first separable portions, or its respective petal segments are assembled in the circumferential direction by combining the first separable portions; and the second disassembly device is fixed to the second rotary body and includes at least two second separable portions, and the second rotary body is split into petals in the circumferential direction by disassembling the second separable portions, or its respective petal segments are assembled in the circumferential direction by combining the second separable portions.

The present application relates to an electric machine splitting or assembling method, an electric machine assembling method, and an electric machine splitting or assembling device including a sleeving device separating or coaxially sleeving first and second rotary bodies; the first disassembly device fixes the first rotary body and includes at least two first separable portions, and the first rotary body is split into petals in a circumferential direction by disassembling the first separable portions, or its respective petal segments are assembled in the circumferential direction by combining the first separable portions; and the second disassembly device is fixed to the second rotary body and includes at least two second separable portions, and the second rotary body is split into petals in the circumferential direction by disassembling the second separable portions, or its respective petal segments are assembled in the circumferential direction by combining the second separable portions.

A method of manufacturing a motor assembly comprising a motor and an impeller coupled to a rotation shaft of the motor, the method includes disposing a plurality of balls in a ring-shaped groove formed in a surface of the impeller; rotating the impeller at a speed greater than a resonant rotation speed to move the balls to a compensation position for compensating for an eccentricity in the motor assembly; and fixing the balls at the compensation position in the groove.

An electric motor for driving a vehicle flap is provided, the electric motor including a hollow-cylindrical shaped stator made of a permanent-magnetic material and arranged coaxially to a motor axis, a motor shaft disposed coaxially with the motor axis and at least partially within the stator and mounted for rotation relative to the stator about the motor axis, and a drive rotor disposed within the stator and mounted on the motor shaft and including a plurality of coils for driving rotation of the motor shaft relative to the stator about the motor axis. The electric motor includes a braking rotor disposed in the stator, mounted on the motor shaft along the motor axis adjacent the drive rotor, the brake rotor being magnetisable by the stator. Use of the electric motor for driving a vehicle flap and to a method of manufacturing the electric motor is also provided.

A motor having a rotor connected to an input shaft and a stator fixed by a fixing jig during assembly to a case includes: a stator convex part that extends radially outward from an outer circumference of the stator and positions the stator with respect to the case; and a case convex part that extends radially inward from an inner circumference of the case and is arranged so as to overlap with the stator convex part in a circumferential direction. A relief part is provided between the stator convex part and the case convex part, the relief part being arranged such that the stator convex part can be rotated along the circumferential direction with respect to the case during assembly.

A motor having a rotor connected to an input shaft and a stator fixed by a fixing jig during assembly to a case includes: a stator convex part that extends radially outward from an outer circumference of the stator and positions the stator with respect to the case; and a case convex part that extends radially inward from an inner circumference of the case and is arranged so as to overlap with the stator convex part in a circumferential direction. A relief part is provided between the stator convex part and the case convex part, the relief part being arranged such that the stator convex part can be rotated along the circumferential direction with respect to the case during assembly.