DE102008024556A1 - Device for fixing a rotor in an electrical machine - Google Patents

Abstract

The invention relates to an electrical machine which finds use in a drive train which has at least one stator or a plurality of stators and at least one rotor or a plurality of rotors, wherein an air gap is formed between adjacent stators and rotors, wherein the electric machine comprises a device for im Substantially fixed fixing at least one rotor relative to at least one stator, wherein the fixing takes place in each case by a bracing of the rotor with the stator.

Description

The The invention relates to an electric machine, which use in a drive train, the at least one stator or more Stators and at least one rotor or more rotors, wherein in each case an air gap between adjacent stators and rotors pronounced is, wherein the electrical machine is a device for substantially stationary fixation of at least one rotor relative to at least a stator, wherein the fixing in each case by a bracing of the Rotor is done with the stator.

at the maintenance of generators, especially in wind turbines can the need insist that the rotor of the generator must be locked. This can be particularly difficult when the rotor on a Flange is flanged, which at least partially outside the generator is stored, as defined positions for locking difficult or impossible to reach. This is among other things because the shaft-rotor system is so heavy that it does not require complex electromechanical Aid positioning is not representable.

task The invention is to improve the state of the art.

Is solved the task by an electric machine, which use in a drive train, the at least one stator or more Stators and at least one rotor or more rotors, wherein an air gap is formed between adjacent stators and rotors, wherein the electric machine is a device for substantially stationary fixation of at least one rotor relative to at least a stator, wherein the fixation in each case by a bracing of the rotor with the stator.

at The electric machine described here is in particular around generators for Wind turbines and engines. Furthermore, the drive train includes the type described here directly driven generators or Transmission-generator systems as used in wind turbines come.

The Can in particular by wedges, which between rotor and stator are inserted, bands which rotor and stator tighten against each other, and clamping sets done.

In In a preferred embodiment of the invention, the fixation essentially rotationally fixed. As a rotationally fixed can in particular the rotation of the rotor with respect to the stator can be understood.

In Another preferred embodiment of the invention can the fixation essentially non-displaceable in axial and / or radial direction of the rotor. Thus, a move of the rotor can be prevented.

In Another preferred embodiment of the invention can the tension by one or more, at least partially in the air gap located clamping sets respectively. clamping sets of the type described here permanently located or in the event of replacement of the rotor in the air gap be introduced.

In a preferred embodiment can at least one of the clamping sets arbitrarily circumferential be positioned in the air gap. It describes extensively the Radial circumference of the air gap, in the at different positions a clamping set or a clamping element is insertable.

In a further preferred embodiment can at least two or more clamping sets circumferentially equidistant at least partially disposed in the air gap. Here refers the equidistant essentially to the radial distance or divide the angle according to the clamping devices evenly.

In In another embodiment, the clamping set or can clamping sets in the tensioned state, the rotor or the rotors act and unfold in the relaxed state no fixing effect. This can be particularly the case when fixedly arranged clamping elements, in particular clamping sets and wedges, are arranged in the electric machine.

In In another preferred embodiment, the locking and relaxing of the clamping sets done by at least one threaded bolt. In this case, the threaded bolt have a left- and a right-hand thread. What causes a distortion can realize advantageous manner.

In a further preferred embodiment, the relaxed clamping sets of the Machine be designed at least partially removable. Thereby can Advantageously, the clamping sets be used in other electrical machines.

In In a further advantageous embodiment, at least one part the machine housing dismantled be. It can advantageously be a part of the machine housing the electrical machine to allow for tensioning.

In a further preferred Ausgestal tion form of the invention, the clamping sets can be at least partially removed or added by the resulting from the disassembly of at least a portion of the machine housing openings from the machine.

In a very preferred Embodiment of the invention, at least one rotor a have rotatable storage, which outside the electrical machine is located. Thus, you can Advantageously, special drive train arrangements at least partially be serviced or replaced.

In another extremely preferred Embodiment of the invention, the rotatable mounting at least a rotor in the electric machine by at least one Bearing point or more bearing points take place, which is a transmission are assigned, which in the drive train of the electric machine upstream or downstream.

in the Furthermore, the invention will be explained with reference to embodiments.

there provides

1 a section of a drive train with transmission and generator,

2 a section of a drive train with a generator and

3 different clamping elements.

1 represents a drive train of a wind turbine. A speed of the rotor blades 101 is through the transmission 105 converted into a mostly higher speed. The rotor 107 of the generator 111 is to the gearbox 105 coupled, causing parts of the rotational energy of the rotor blades 101 in the generator 111 over the waves 103 is convertible into electrical energy. The magnets induce 109 in the rotor, a voltage in the coils 201 of the stator 203 of the generator. Between the magnets 109 and the coils 201 An air gap is formed. In this air gap is a clamping element as in 3 described insertable, whereby the rotor 107 in relation to the stator 203 can be tightened.

Analogously, the statements in 2 , wherein here a gearless drive train is shown, in which the rotation of the rotor blades 101 over the wave 103 directly in the generator 111 is converted into electrical energy.

In 3 are different clamping elements A, B and C, which are inserted into the air gap, shown. In Part A, a wedge (clamping element) between magnet 109 of the rotor and coil 201 of the stator 203 inserted in the direction of the arrow. This leads to a distortion of the rotor 107 and stator 203 , Thus, the rotor 107 fixed and maintenance or replacement is possible.

Clamp B has a threaded rod 307 with a left and right-hand thread on. Will now be the threaded rod 307 attracted spread the tension arms 303 / 305 so that rotor 107 and stator 203 be braced against each other.

Clamping element C has a threaded rod 309 , which on wedge elements 311 / 317 so acts that the sliding elements 313 / 315 rotor 107 and stator 203 be braced against each other.

Claims (13)

Electric machine, which use in one Driveline finds that at least one stator or more stators and at least one rotor or a plurality of rotors, wherein between adjacent stators and rotors one air gap each pronounced is, wherein the electrical machine is a device for substantially stationary fixation of at least one rotor relative to at least a stator, wherein the fixation in each case by a bracing of the rotor with the stator. Electrical machine according to claim 1, characterized that the fixation is substantially rotationally fixed. Electric machine according to claim 1 or 2, characterized characterized in that the fixation substantially displaced takes place in the axial and / or radial direction of the rotor. Electric machine according to one of the preceding Claims, characterized in that the tension by one or more, at least partially located in the air gap clamping sets. Electrical machine according to claim 4, characterized that at least one of the clamping sets arbitrarily circumferential can be positioned in the air gap. Electric machine according to one of the preceding Claims, characterized in that at least two or more clamping sets circumferentially equidistant at least partially arranged in the air gap. Electrical machine according to one of claims 4-6, characterized in that the clamping set or the clamping sets in the tensioned Zu stood the one or more rotors act fixing and unfolded in the untensioned state no fixing effect. Electrical machine according to one of claims 4-7, characterized characterized in that the locking and relaxing of the clamping sets by at least one threaded bolt takes place. Electric machine according to claim 7 or 8, characterized characterized in that the relaxed clamping sets from the machine at least are partially removable. Electrical machine according to one of claims 4-9, characterized characterized in that at least a part of the machine housing is removable. Electric machine according to claim 9 or 10, characterized characterized in that the clamping sets by the resulting from the disassembly of at least a portion of the machine housing openings from the machine are at least partially removed or added. Electric machine according to one of the preceding Claims, characterized in that at least one rotor is not rotatable Has storage that is assigned to the electrical machine. Electrical machine according to claim 12, characterized that the rotatable mounting of at least one rotor in the machine takes place by at least one bearing point or several bearing points, attributable to a transmission, which in the drive train of the electric Machine upstream or downstream.