This cantilevered-shaft electric motor has no bearing on the load side, and since there also is no end bracket, which is present in ordinary electric motors, the internal stator and rotor are in an unprotected state in a bare state. The present invention provides a cantilevered-shaft electric motor that prevents damage to the stator and rotor during transport, causes handling properties during transport and during coupling to a load side to be favorable, and prevents contaminants from infiltrating. The cantilevered-shaft electric motor is provided with: a stator that is affixed at the inner diameter side of a housing; and a rotor that is rotatably borne disposed facing the inner peripheral side of the stator. The cantilevered-shaft electric motor has a structure such that the rotor is provided with a bearing at the reverse side from the load and the shaft at the load side is supported at an apparatus side. The cantilevered-shaft electric motor is characterized by being provided with a partition plate having a hole through which the rotary shaft penetrates at the load side of the rotor, the partition plate being provided with: a role as an affixing jig that supports the rotary shaft in a manner so that the rotor does not contact the stator during transport; and a role as a protective member that prevents the infiltration of contaminants from the outside.

An electric drive unit and method of assembling the same is disclosed. The electric drive unit includes a rotor having a rotor shaft, and gear shaft, where the rotor shaft is inserted into the gear shaft. The gear shaft is supported by two bearings, while the rotor shaft supported directly at one end by a bearing and at the other by the gear shaft. A wave spring is also disclosed that provides an axial loading to the rotor shaft. Also disclosed is a balancing ring secured to an end of the rotor via a locknut. The balancing ring can be machined in order to balance the rotor. The rotor shaft can be connected to the gear shaft via a spline connection. The rotor shaft can bear against the gear shaft via a pilot journal and pilot bore defined on the rotor shaft and gear shaft respectively.

A rotor for a rotary electric machine, the rotor having an axis of rotation and including a rotor shaft extending parallel to the axis of rotation, a rotor body mounted on the rotor shaft and having a plurality of teeth protruding radially, and at least one field coil wound around the plurality of teeth, the field coil forming coil ends at axial ends of the teeth. At least one cover mounted on the rotor shaft and configured to cover the coil ends. The cover includes a plurality of holes configured to each receive a solid balancing element which provides an additional mass to the rotor in order to balance said rotor.

Disclosed is an electric machine comprises a resolver which comprises a resolver rotor and a resolver stator, the resolver rotor being assembled by: applying a DC voltage across at least one phase of windings the electric machine to create a static magnetic field by a DC electric current flowing through the at least one phase of windings of the three-phase windings, the static magnetic field forcing a machine rotor to rotate to an angular orientation where an N-S direction of magnets of the machine rotor is aligned with an N-S direction of the static magnetic field and keeping the machine rotor stably in this angular orientation; and pushing the resolver rotor onto a machine shaft in an axial direction in a state that the machine rotor is kept in the angular orientation by the static magnetic field.

A method for reducing stress concentration on a rotor sleeve during balance cutting comprising: providing an axial protrusion to an outer diameter of a first end cap and a second end cap of a rotor assembly; and radially cutting at least one of the sleeve or the axial protrusion to balance the rotor assembly.

A system and method for servicing a generator rotor of a turbine are presented. The system includes a support device for supporting the rotor. The support device has a surface. A contact point is established on the surface where the rotor contacts the surface. A location of the contact point along the surface may be variable based on a diameter of the rotor. The support device may be able to accommodate a plurality of different rotors having a plurality of different diameters.

A system for assembling a generator, preferably a permanently excited generator of a wind turbine, comprising a rotor and a stator. A vertical assembly device connectable to the rotor and the stator is proposed, for guiding the rotor in parallel and coaxially aligned to the stator during assembly, the vertical assembly device comprising a first assembly element being connectable to the rotor, a second assembly element being connectable to the stator, and guiding means for guiding the first assembly element coaxially aligned to the second assembly element.

A system for assembling a generator, preferably a permanently excited generator of a wind turbine, comprising a rotor and a stator. A vertical assembly device connectable to the rotor and the stator is proposed, for guiding the rotor in parallel and coaxially aligned to the stator during assembly, the vertical assembly device comprising a first assembly element being connectable to the rotor, a second assembly element being connectable to the stator, and guiding means for guiding the first assembly element coaxially aligned to the second assembly element.

The present invention relates to a slotless motor including a thin-walled hollow rotor body 100, and methods of manufacture of such rotors, the methods including hot forming and machining steps. The rotor body has a rotational axis 102 and comprises a first cylindrical portion 104 having a first diameter, a second cylindrical portion 106 having a second diameter, larger than the first diameter and a third cylindrical portion 108 having a third diameter, smaller than the second diameter, the third cylindrical portion located at a second end of the rotor body 100. A first end cap 110 joins the first and second cylindrical portions together, and a second end cap 112 joins the first and second cylindrical portions together. The first, second and third cylindrical portions are all arranged coaxially with the rotational axis 102 of the rotor 100 such that the second cylindrical portion 108 and the first and second end caps collectively define a hollow cavity 114 in the rotor body 100. The rotor body 100 may be provided with a Halbach array.

A rotor (10) of an electric machine has a shaft (11) a laminated core (12) arranged on the shaft (11) and balancing bodies (13) arranged on the shaft (11). The balancing bodies (13) have an aperture (15) situated outside the center of gravity. Each balancing body (13) is mounted by way of the aperture (15) on the shaft (11) of the rotor (10) in a defined angular position. Positioning sleeves (20) are arranged on the shaft (11) to define a distance between bearings (16, 17) of the shaft (11) and the laminated core (12) or the balancing bodies (13) and to provide an anti-rotational safeguard for the balancing bodies (13).