A method releases rotor poles of a large electrical machine from the rotor hub, which in the fitted state is located within the stator. In one method step, at least one device is introduced into the air gap between the sector and a rotor pole to be released. The device has a carrier plate and at least one cushion that can be filled with gas and is attached to the carrier plate. In a following method step, the cushions belonging to the device are filled with gas under pressure, the pressure being successively increased until the pole to be released has come away, and in that, in a following method step, the at least one device is removed from the air gap. In a further step, the released pole is pulled out of the rotor hub.

An electric motor includes a stationary stator and a rotating rotor. To assemble the rotor, a grease is applied to at least a portion of the shaft of the rotor proximate a rotor core disposed on the shaft. A liquid varnish is applied to the rotor core and allowed to harden. The grease can be removed from the shaft along with any varnish that had hardened thereon. Later, the same grease can be reapplied to the shaft to facilitate installation of a bearing onto the shaft. The process can apply to the assembly of new electric motors or to the remanufacturing of previously constructed motors.

Embodiments of the present invention relate to a winding of a rotor for use in rotating electrical machines. More particularly, embodiments of the present invention relate to innovative half-coils used for the winding of the rotor. Moreover, embodiments of the invention pertain to a method for winding a rotor body of an electrical machine. According to embodiments of the invention, half-coils, instead of being manufactured as double hollow conductors, are provided in the form of two single hollow conductors, which are adjacently embedded within a respective slot of the rotor body.

A system and methods for disassembling a rotary machine are provided. The rotary machine includes a casing having a plurality of arcuate channels. The system includes a reaction bridge that is configured to couple to the casing of the rotary machine such that the reaction bridge is moveable along a length of the casing. The reaction bridge includes a front support and a rear support that is substantially parallel to the front support. Each of the supports includes a first leg, a second leg, and a support beam extending therebetween. A force device including an actuator and an engaging rod extending therefrom is coupled to the reaction bridge. The force device is configured to apply a force substantially tangentially to a segment positioned in one of the casing arcuate channels.

A retrofit method for modifying a radial lead seal assembly of a generator and a radial lead seal assembly of a generator are presented. The radial lead seal assembly seals a radial chamber from an axial chamber. The radial lead seal assembly includes sealing elements disposed around a radial lead to seal an annular space between the radial lead and the radial chamber, a coil spring disposed around the radial lead between the sealing elements and a junction between the radial lead and the axial lead, and a nut. The retrofit method includes removing one or more of the sealing elements to define a radial space between the remainder of the sealing elements and the coil spring. Conical springs are inserted in the radial space and only partially compressed under a radially inward compressive load exerted on the radial lead seal assembly via the nut.

Disclosed is a cargo handling system, and a power drive unit (PDU) for a cargo handling system, wherein the PDU comprises a permanent magnet motor (PMM) and is designed to provide a first static restraint braking function effectuated by designing the PMM to have a high cogging torque, and a second dynamic control braking function effectuated by motor regeneration.

Apparatus and methods to magnetize and demagnetize the magnetic poles of a rotor assembly for an electrical machine, such as a generator. The apparatus and methods provide for individually magnetize magnetic domains in the permanent magnetic material of the magnetic poles of a rotor assembly of the electrical machine after the electrical machine is installed in a larger assembly. The magnetization system may be used to magnetize and demagnetize the magnetic poles while the rotor assembly is connected with a prime mover, such a rotor of a wind turbine.

The invention relates to an electrical machine (1) comprising a rotor (4) which is rotatably mounted around a rotation axis (5) extending in the axial direction (3) in bearing devices (16, 17), a stator (7) having two axial ends, an air gap between rotor and stator, an interior chamber (10) encompassing the stator (7) and rotor (4), a sleeve (11) encompassing a first part (111) which encloses the interior chamber (10), a frame (12) having a first (123) and a second (121) longitudinal support (123), a first (122) and a second (124) cross-support, and a dividing device (2) on the frame (12). The stator (7) comprises a fastening device (15) for connection to the frame (12) and the dividing device (2) can make the interior chamber accessible from the outside in a plane parallel to the frame (12). The invention further relates to a collection, to a frame (12), to a sleeve (11), or to a service or production method of such an electrical machine (1).

An isostatic brush holder (10) comprises a central body (12), one or more arms (14, 14) rotationally disposed in proximity of the opposite ends of said central body (12), and defining a first and a second end (16, 16), and a plurality of brushes (20) cooperating with at least one elastic element (22), where said arms (14, 14) define the respective first ends (16) of quick release snap catches (24, 24), said arms being pivoted to each other at the second ends (16), said arms being further connected in a swivelling manner and in proximity to said second ends (16) at the opposite ends of said central body (12).

Stators for use in electric machines and methods for refurbishing the same. One method for refurbishing a stator for use in an electric machine includes at least partially disassembling the stator to provide access to a plurality of stator windings connected in a four-circuit star connection having three turns per coil, and reconfiguring the stator such that the plurality of stator windings are connected in a four-circuit delta connection having five turns per coil.