SE520612C2 - A rotor unit and a method for its balancing - Google Patents

Abstract

A gas turbine unit (20) has a rotor unit (10) comprising a mono-shaft (30), a compressor wheel (40), a turbine wheel (50), a tie bolt (60), and a tie bolt nut (70). The mono-shaft (30) is essentially cylinder-shaped with a centre through hole for containing the tie bolt (60), and has a first supporting bearing arrangement (100) detachably attached to a first end and a second supporting bearing arrangement (110) detachably attached to a second end. The compressor wheel (40) and the turbine wheel (50) constitute a detachable unit, which is attached by means of the tie bolt (60) at the second end of the mono-shaft (30), forming a shaft overhang, the tie bolt protruding through the centre of the mono-shaft and into the centre of the turbine wheel.

Description

25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 4llO-0l0 SEHGOC Hbg 2. 520 612 are more difficult with associated high costs compared to gas turbines that only have one shaft due to a more complicated replacement procedure when maintaining a shaft in an existing plant.

Summary of the Invention The main objects of the present invention are to simplify the design, balancing and replacement procedure for rotor units in gas turbine units.

These objects are achieved for gas turbine units by means of a rotor unit according to the invention. The rotor unit has a single shaft, a compressor wheel, a turbine wheel, a drawbar, and a drawbar nut. The single shaft is substantially cylindrical with a through center hole for accommodating the drawbar and has a first support bearing device releasably connected to a first end and a second support bearing device releasably connected to a second end.

The compressor wheel and the turbine wheel form a detachable unit, which is connected by means of the drawbar at the other end of the single shaft and forms a shaft overhang, the drawbar running through the center of the single shaft and into the center of the turbine wheel where one end of the drawbar is detachable. removably connected in the center of the turbine wheel or compressor wheel, and the drawbar nut is detachably connected to the other end of the drawbar at the first end of the single shaft.

These objects are also achieved by a method of balancing the rotor unit, in which each of the rotating parts of the rotor unit is weighed so that the balancing of the rotor unit can be performed as accurately as possible. The balancing is done step by step, ie. the rotor unit consists of the plurality of detachable parts, which are mounted together in groups starting with the assembly and a first balancing step for a first part, which is then followed by an assembly of a 10 U 20 25 30 2001-08-29 E: \ PU'BLIC \ DOC \ P \ 4ll0-O10 SE.dOC Hbg 3 520 612 second part against the first part and balancing them together in a second step and so on. until all the parts that make up the complete rotor unit have been assembled and balanced together. Each balancing step comprises sub-steps of assembling each part or group of parts together, which is then followed by a calibration of each part or group of parts by compensating for the imbalance by applying adhesive material corresponding to the imbalance on the part or parts which shall be calibrated. This is followed by a balancing of each part or group of parts by processing away material corresponding to the imbalance, ie. the self-adhesive material, until an imbalance less than an acceptable value for the entire rotor unit is achieved. The last step refers to a marking of this "best" position or final balancing conditions on each rotating part of the complete rotor unit.

By providing a gas turbine unit with a rotor unit that is easy to balance, the following advantages are achieved: The construction of the gas turbine unit is simplified due to fewer parts, ie. no switch is needed between the generator and the rotor unit, and the maintenance and replacement of the rotor unit is simplified due to the fact that its balancing can be performed in advance and that it can be stored as a storage item, thereby reducing associated costs.

Brief Description of the Drawings The present invention will now be described in further detail with reference to the accompanying drawings, in which: Fig. 1 is a longitudinal side view in section of a preferred embodiment of a rotor unit according to the invention mounted in a gas turbine. FIG. 2 is a longitudinal side view in section of a first preferred embodiment of a rotor unit according to the invention, Fig. 3 is a longitudinal side view in section of a second preferred embodiment of a rotor unit according to the invention, Fig. 4 is a longitudinal enlarged side view of one end to any of the preferred embodiments of the rotor unit, Fig. 5 is an enlarged longitudinal side view in section of the second end of the first embodiment of the rotor unit of Fig. 2, Fig. 6 is an enlarged longitudinal side view in section of the second end of the second embodiment. one for the rotor unit in Fig. 3, Fig. 7 is a side view of the rotor unit in Fig. 3 showing the positions and planes of the rotor unit where imbalances are measured and compensated during a balancing procedure for the rotor unit according to the invention, Fig. 8 is a side view showing a step in the balancing procedure of FIG. 7, FIG. is a side view showing another step of the balancing procedure of FIG. 7, and FIG. 10 is a side view showing yet another step of the balancing procedure of FIG.

Detailed description of the invention Fig. 1 shows a rotor unit 10 according to the invention mounted in a gas turbine unit 20. The gas turbine unit also comprises a housing 2, a combustion chamber 3 only partially shown, a generator 4, and an air intake 5.

FIG. 2-3 show the rotor unit 10 according to the invention in two preferred embodiments. For the sake of clarity, no cross-sectional markings are shown in the following drawings. The rotor unit comprises a simple shaft structure 30 which is hereinafter referred to as E = \ PuBL1c \ noc \ P \ 411o-o1o sndoc Hbg. i. *. ' 5 2 'i, 520 613 ter is simply called a monoaxel, i.e. a single shaft for a compressor wheel 40, a turbine wheel 50, and a generator rotor 80 in the generator 4, the turbine wheel driving both the compressor wheel and the generator rotor. The compressor wheel 40 is of a single-stage centrifugal type and the turbine wheel 50 is of a single-stage radial flow type. The single shaft 30 also includes a drawbar 60, a drawbar nut 70 and a first bearing assembly 100 at a first end and a second bearing assembly 110 and a rotor shaft 90 at a second end. The compressor wheel 40 and the turbine wheel 50 form a detachable unit, which is attached by means of the drawbar 60 to the other and provides one end of the mono-shaft 30, the shaft overhang.

The drawbar 60 is a solid, long and straight, substantially cylindrical shaft and has at least one support surface 60 ', 2-6, the walls of the through center hole of the mono shaft 30. as seen in FIG. This support is achieved by a larger diameter at the support surface, whereby the portion or portions between the support surface and the respective ends of the drawbar 60 have a smaller diameter and form a waist. The ends of the drawbar are threaded.

The mono shaft 30 is substantially cylindrical and consists of the generator rotor 80 and the rotor shaft 90, each of which is cylindrical and has a through center hole for accommodating the drawbar 60. The generator rotor has different constructions in the two embodiments shown in FIGS. 2 and 3. , through various shaped annular permanent magnets 81a, 81b around its circumference, which provide certain properties of the generator rotor 80a with the permanent magnets 81a in FIG. 2 and other properties of the generator rotor 80b with permanent magnets 81b in FIG.

The second embodiment of the generator rotor 80b also includes a race holder 61 and a screw 62 for securing it to the first end of the generator rotor 80b, as shown in FIG. magne- W Ü 20 25 30 35 2001-05-29E = \ 1> UBL1c \ noc \ P \ 411o »o1osßdocabg v *;". i; an aid when starting the gas turbine unit 20.

The generator rotor 80a or 80b and the rotor shaft 90 of the mono shaft 30 are detachable from each other and guided at their Rotor shaft 90 are detachably attached and guided by guide pins 91, 2-4, contact ends of guide pins 31, as shown in FIG. 2-4. as also shown in FIG. at its other end against the compressor wheel 40. The drawbar 60 runs through the center of the generator rotor and the rotor shaft, ie. the mono shaft 30, and into the center of the turbine wheel 50 where it is connected with a threaded 2-4. the nut is in turn releasably attached to the turbine wheel with the end against a turbine nut 52 shown in FIG. Turbine means of a short threaded pin 51 protruding from the center of the turbine wheel 50. The drawbar nut 70 is releasably attached to the other threaded end of this drawbar 60.

The drawbar nut 70 holds the first bearing device 100 against a shoulder 100 'at the first end of each generator rotor 80a and 80b by means of a bearing clamp plate 102, in FIGS. 2, 3, the ring 100 and the second bearing arrangement 110 have the same cone 5 and 6. The first bearing assembly in each of the preferred embodiments of the generator rotor 80a and 80b. The second bearing device 110 is held by the rotor shaft 90 against a shoulder 101 'at the other end of the respective generator rotors 80a and 80b shown in FIG. 2-4.

Fig. 4 illustrates the other end of the respective generator rotors 80a and 80b in which the second bearing device 110 is shown in more detail. This second bearing device comprises a roller bearing 111, a spring ring 112 for pouring the roller bearing and a non-rotating clamping film sleeve 113, a front labyrinth sleeve 114 for sealing the generator rotor 80a or 80b against lubricating oil and / or dirt from the roller bearing, at least one o ring 115 placed on the circumference of the non-rotating rear bearing sleeve 116 to seal the generator from the environment when the complete rotor unit 10 is mounted in the gas turbine 20, and a rear labyrinth sleeve 117 for sealing the roller bearing 111 against dirt and sealing the compressor air from lubricating oil in the roller bearing.

FIG. 5 and 6 show the first end of the respective generator rotors 80a and 80b in which the first bearing device 100 is shown in more detail. This first bearing device includes a ball bearing 101, the bearing clamp plate 102, which holds the ball bearing against the shoulder 100 'of the generator rotor, a non-rotating labyrinth sleeve 103 and a labyrinth stator seal 104 for sealing the generator rotor from lubricating oil in the ball bearing, a spring ring 105 for holding the labyrinth ring and the labyrinth stator seal together, and at least one o-ring 106 located on the periphery of a non-rotating front bearing sleeve 107 to seal the generator rotor from the environment when the complete rotor unit 10 is mounted in the gas turbine 20. In FIG. screw 62 connected to the first end of the generator rotor 80b.

A description will now be given of a method for balancing the rotor unit 10 according to the invention. The principle of balancing is to first weigh all rotating parts, which must be balanced, before the balancing process begins, then calibrate and measure wobbling, imbalances and residual imbalances for the affected parts.

This is done first for the generator rotor 80a or 80b and then together with the other rotating parts, which are mounted step by step and form groups together up to the complete rotor unit 10.

Each step is documented with respect to wobbling, imbalance, residual imbalance after calibration and the balancing result in a balancing register. The calibration of each part and groups of parts is performed in a standard balancing machine (not shown) which is available on the market. The balancing machine measures the imbalance at predefined planes and positions on the rotor unit 10, shown in FIG. 7, by 10 15 20 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 4l10-010 SE.dOC Hbg 520 8612 to rotate the rotor unit at a certain rotational speed, in this application 2500 rpm, whereby the size of the imbalance is defined and the position and radius at which it is located.

The measured imbalance is compensated by applying self-adhesive material at the correct radius, position and plane corresponding to the imbalance, ie. spaced 180 ° from the position of the imbalance seen in a circle, until the imbalance is almost equal to zero or less than a permissible value.

Material is then machined away from the same position as the measured imbalance, ie. at the position which is 1800 from where the applied self-adhesive material is located, to its weight corresponding to the imbalance, ie. the same weight as the applied adhesive material, has been processed away. Therefore, each part is weighed before and after machining so that as precise a material weight as possible is machined away. The imbalance is measured in gmm, which is a measure of the imbalance at a certain radius, a measured imbalance of for example 10 gmm is a product of mm radius and weight in grams, which can be compensated either by processing away 10 g of material at radius 1 mm or process 1 g of material at a radius of 10 mm in a linear relationship.

The drawbar 60 is always biased when mounted together with the drawbar nut 70 and the bearing clamp plate 102 during each mounting step, which is explained below, with a force of 47 kN, whereby it has a protruding length of 26.5 mm in the untensioned condition and about 28 mm in the prestressed the condition.

The method is explained with reference to FIG. 7-10. Fig. 7 shows the complete rotor unit 10 with the positions and planes at which imbalance and wobbling are measured. The method refers to the successive steps of first manually measuring the wobbling of the generator rotor 80a or 80b with a dial gauge to check that there are no major W ß 20 25 30 2001-08-29 E: \ PUELIC \ DOC \ P \ 41l0-010 SELdOC Hbg 520 6912 wobbles. The ball bearing 101 is then mounted at the first end of the generator rotor, the roller bearing 111 and a long balancing sleeve 120 are mounted at the second end, and the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102 are mounted at the first end, as shown in FIG. 8. This is followed by a rough calibration in the balancing machine at planes C and D shown in Fig. 7, and a rough balancing by machining, here drilling away material in planes C and D at a radius of 24 mm with an angle of 20 °. Residual imbalance is compensated by applying self-adhesive material at a suitable radius at planes C and D.

The long balancing sleeve 120 is removed and the rotor shaft 90 and a short balancing sleeve 130 are mounted at the other end of the generator rotor 80a or 80b, and the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102 are mounted at the first end of the generator rotor, as shown in FIG. 9. These components are then calibrated as a group in the balancing machine at planes C and L shown in FIG. 7, the imbalance being compensated for by applying adhesive material at the correct radius at plane L on the rotor shaft.

The short balancing sleeve 130 is removed and the compressor wheel 40 and a balancing sleeve 140 are mounted at the other end of the generator rotor 80a or 80b, and the drawbar 60, drawbar nut 70 and bearing clamp plate 103 are mounted as in the previous step, as shown in FIG.

The generator rotor 80a or 80b, the rotor shaft 90, the compressor wheel 40, the balancing sleeve 140, the drawbar, the drawbar nut and the bearing clamp plate 102 are calibrated as a group in the balancing machine at planes E and F shown in Fig. 7. The compressor wheel 40 is mounted in four different positions. each of which is followed by a calibration and documentation, with a 90 ° pitch between them so that the "best" position can be chosen in relation to the least wobbling and imbalance. The remaining imbalance in the "best" position is compensated 10 29 20 2001 2001-08-29 E: \ PU'BLIC \ DOC \ P \ 4ll0-Ol0 SE.dOC Hbg 10 520 612 by applying self-adhesive material to a suitable radius at planes E and F.

The balancing sleeve 140 is then removed and the turbine wheel 50, the turbine sleeve 53 and the turbine nut 52 are mounted against the compressor wheel 40, and the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102 are mounted in the same manner as shown in FIG. near plane H is measured and documented and the generator rotor 80a or 80b, the rotor shaft 90, the compressor wheel, the turbine wheel, the turbine sleeve, the turbine nut, the drawbar, the drawbar nut and the bearing clamp plate are then calibrated together in the balancing machine at planes G and H. 50 are also mounted in four different positions in a manner similar to the compressor wheel 40, each position being calibrated and documented with a 90 ° pitch between them so that the "best" position can be selected in relation to least wobbling and imbalance. The "best" position is marked on the turbine wheel 50, the compressor wheel 40, the rotor shaft 90 and the drawbar 60, and the length of the protruding part of the drawbar is measured and documented.

All the balancing steps described above are performed so that the "best" position with respect to the least wobbling and imbalance of the compressor wheel 40 and the turbine wheel 50 can be determined. A small wobbling on the turbine outlet is a priority The most important thing is that the wobbling on the drawbar 60 can be repeated instead of machining away smaller materials. each assembly and disassembly step.

The turbine wheel 50, the compressor wheel 40 and the rotor shaft 90 are removed, and the long balancing sleeve 120 is again mounted with the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102, the drawbar being mounted with the same length on the protruding part as in the previous steps.

The generator rotor 80a or 80b is then balanced by machining away material, here by drilling in an incrementally shaped pattern at a radius of 24 mm in planes C and D shown in 10 15 20 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 4ll0-0l0 SE.d0C Hbg ll 520 612 FIG 7, with an angle of 20 ° until the balance is less than a permissible value of 1.0 gmm.

The next step is to remove the long balancing sleeve 120 and mount the rotor shaft 90 and the short balancing sleeve 130, the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102. The rotor shaft is balanced by machining, ie. drill away material radially at plane L until a permissible imbalance below 3.0 gmm is achieved.

The short balancing sleeve 130 is then removed and the compressor wheel 40 and balancing sleeve 140 are mounted together with the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102 again, the drawbar being first removed in the same way as in the previous steps. Material is machined from the compressor wheel in the axial direction at plane E and plane F, ie. by drilling in the axial direction at plane E and grinding the surface at plane F. If large machining operations must be carried out at plane E, it is possible to machine away material at plane L on the rotor shaft 90, ie. by drilling in the radial direction at plane L. The compressor wheel 40 is disassembled before each machining step, which also guarantees a repetition of the calibration. An imbalance of 5 gmm is allowed at plane E and an imbalance of 10 gmm is allowed at plane F. The balanced compressor wheel is checked by examining how residual imbalance affects the bearing points at generator rotor 80a or 80b at plane A and B shown in Fig. 7. This is performed by transmitting the values of residual imbalance of the compressor wheel 40 to the calibration of the generator rotor 80a or 80b at planes C and D.

The balancing sleeve 140 is then removed and the turbine wheel 50, the turbine sleeve 53 and the turbine nut 52 are mounted together with the drawbar 60, the drawbar nut 70 and the bearing clamp plate 102, the drawbar being mounted in the same manner as in the previous steps. The wobbling on the outlet for the turbine wheel is measured and documented and the material on the turbine wheel is processed by grinding. 10 15 20 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 4ll0-010 SELdOC its surface at plane G and the surface at plane H near the outlet of the turbine wheel. Large amounts of material are machined away with the turbine wheel 50 removed, and an imbalance of 10 gmm is allowed at level G and an imbalance of 5 gmm is allowed at level H. A final machining can be performed with the turbine wheel fitted to achieve an approved balancing result. After the turbine wheel has been balanced, a check of the final balancing is performed by transferring the value of the imbalance of the turbine wheel to the calibration plan for the generator 80a or 80b, ie. the imbalance at planes C and D must be less than an allowable level. The complete bearing devices 100 and 110 are then mounted, whereby the rotor unit is complete, to check that any remaining imbalance after the final balancing is within the permissible range. The final step in balancing the rotor unit 10 is to accurately mark the "best" positions of all the balanced rotating components belonging to the rotor unit.

All the balancing steps described above are common to the two embodiments of the generator rotors 80a and 80b of the rotor unit 10 according to the invention. However, the balancing of the second embodiment of the generator rotor 80b differs from the method of balancing the first embodiment of the generator rotor 80a. The difference is a few extra steps in the balancing procedure before the last step of accurately marking the "best" position for all the parts concerned which relates to the step of checking the final balancing for the complete rotor unit 10, ie. the barrel holder 61 and associated screw 62 are mounted therein when the two bearing devices 100 and 110, second embodiment. These additional steps are as follows: The running holder 61 and its associated screw 62 are first mounted at the first end of the generator rotor 80b after checking the final balancing at the calibration plan on 29 15 2001-08-29 E: \ P'UBLIC \ DOC \ P \ 4ll0-0l0 SEHGOC Hbg 13 520 612 generator rotor 80b in planes C and D. Then the wobbling and imbalance of the running holder are measured and documented. After this, the barrel holder is removed and then balanced by processing material on the barrel holder 61 at plane K, shown in FIG. 7, on the side located opposite its magnets until the imbalance is below a permissible level. Then the two bearing devices 100 and 110 are mounted before the barrel holder and its screw, whereby the rotor unit 10 is complete, to check that any remaining imbalance for the complete rotor unit is within the permissible range and that the wobbling for the runner is repeated after the final balancing. The final step in balancing the second embodiment of the generator rotor 80b relates to the exact marking of the "best" position for all the balanced and rotating components of the rotor unit 10.

Claims (10)

W H 20 25 30 35 2001-08-29 E: \ PUELIC \ DOC \ P \ 4110-010 SE.d0C Hbg l4 520 612 PATENTKRAV A rotor unit (10) of a gas turbine unit (20) comprising a mono shaft (30), a compressor wheel (40), a turbine wheel (50), a drawbar (60), and a drawbar nut (70), characterized in that the mono shaft (30) is substantially cylindrical with a through center hole for accommodating the drawbar (60), and has a first supporting bearing device (100) second supporting bearing device (110) releasably attached to a first end and one releasably attached to a second end. A rotor unit (40) which is connected by means of the drawbar (60) to it (30), the drawbar extending through the center of the mono-axis and into (10) according to claim 1, wherein the compressor wheel and the turbine wheel (50) form a detachable unit, the other end of the mono-axis forming a shaft overhang, the center of the turbine wheel where one end of the drawbar is detachably connected to the center of the turbine wheel or the compressor wheel and the drawbar nut (70) is detachably connected to the other end of the drawbar at the first end of monoaxles (30). (30) consists of two parts which are detachable from each other, one (80a, 80b), (90), both of which have a continuous center. A rotor assembly according to claim 2, wherein the monoaxial permanent magnet generator rotor and a cylindrical rotor shaft drum hole for accommodating the drawbar (60), and releasably connected and guided by guide pins (31) at one end to the other end of the generator rotor, and releasably connected and guided by guide pins (91) at the other end against the compressor wheel (40). The rotor assembly of claim 3, wherein the drawbar nut (70) tilts the first bearing assembly (100) against a N Ü 20 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 41l0-0l0 SE.dOC Hbg 520 612 shoulder 80b) bearing clamp plate (102), whereby a secure connection of it (100 ') to the generator rotor (80a, by means of a first bearing device is guaranteed. The rotor unit according to claim 4, wherein the rotor shaft (90) holds the second bearing device (110) against a shoulder 80b), connection of the second bearing device is guaranteed. (101 ') on the generator rotor (80a, whereby a safe The rotor unit according to claim 5, wherein the permanent magnet (80a, 80b) (8la, which is attached around the circumference of the generator rotor and the output generator rotor 81b) makes the main outer surface between the two bearing bearings (100, 110). have annular magnets arrangements The rotor unit according to claim 6, wherein the compressor wheel (40) is of a single-stage centrifugal type and the turbine wheel (50) is of a single-stage radial flow type. A method of balancing the rotor unit (10) according to claim 3, characterized in that each of the rotating parts of the rotor unit (10) is weighed so that the balancing of the rotor unit can be performed as precisely as possible, that the balancing of the rotor unit (10) is performed step by step, i.e. the rotor unit consists of the plurality of detachable parts, which are assembled together in groups starting with the assembly and a first balancing step of a first part, then mounting another part against the first part and balancing them together in a second step and so on until all the parts forming the complete rotor- (10) at each balancing step refers to the sub-step of mounting the unit has been mounted and balanced together, each part or group of parts together, then calibrating each part or group of parts by compensating its 10 U 20. 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 4110-010 SEHGOC Hbg 16 520 612 imbalance by applying adhesive material corresponding to the imbalance on the part or parts to be calibrated, and then balancing each part or group of parts by machining away materials that correspond to the imbalance, ie. the self-adhesive material, until an imbalance below a permissible value for the complete rotor unit (10) is reached, and, finally, in a final step, mark this "best" position or final balancing condition on each rotating part of the complete rotor unit (10). Method for balancing the rotor unit (10) according to claim 8, characterized by the successive steps a first balancing step, which comprises a first sub-step for manually measuring the wobbling for generating (80a, 80b) a second sub-step for mounting a ball bearing dry rotor with a measuring clock, (101) (III) and a long balancing sleeve (120) at the second end, at the first end of the generator rotor, a roller bearing and the drawbar (60), the drawbar nut (70) and the bearing clamp plate (102) (80a , Bob), at the first end of the generator rotor a third sub-step to roughly calibrate the generator rotor in a balancing machine, a fourth sub-step to roughly balance the generator rotor by machining material thereon, and a fifth sub-step to calibrate the generator rotor (80a, 80b) residual imbalance by applying adhesive to the balancing machine by compensating material at the appropriate radius of the generator rotor, a second balancing step comprising a first un step of removing the long balancing sleeve (120), a second lower step of mounting the rotor shaft (90) and a short balancing sleeve (130) at the other end of the generator row (80a, tower 80b), and mounting the drawbar, drawbar nut WU 20 25 30 2001-08-29 E: \ PUELIC \ DOC \ P \ 4ll0-0l0 SEAiOC Hbg 17 520 612 and the bearing clamp plate at the first end of the generator rotor, and a third sub-step to calibrate the generator rotor, the rotor shaft, the short balancing sleeve, the drawbar, drawbar nut and bearing clamp plate in the balancing machine, the imbalance being compensated for by applying self-adhesive material at a suitable radius to the rotor shaft (90), followed by a third balancing step, which comprises a first sub-step for removing the short balancing shaft. (130), (40) the other end of the generator rotor sizing sleeve a second lower step for mounting the com- (140) and mounting the presser wheel and a balancing sleeve at it (80a, 80b), the drawbar (60), the drawbar nut (70) and the bearing clamping plate. (102), at the first end of the generator rotor, and a third sub-step of calibrating the generator (80a, 80b), (90), (40), the balancing sleeve (140), the drawbar, the drawbar nut (70), (102) , the compressor wheel being mounted in four different positioner rotors, the rotor shaft the compressor wheel (60), and the bearing clamp plate in balancing machines with a pitch of 90 ° between them so that the "best" position can be selected in relation to least wobbling and imbalance, and the remaining imbalance in the "best" position is compensated by applying self-adhesive material at the appropriate position, a fourth balancing step, which includes a first sub-step of removing the balancing sleeve (140), a (50). (51), and the turbine nut (52) at the other end of the second step of mounting the turbine wheel the turbine sleeve rotor rotor (80a, 80b), and mounting the drawbar (60), drawbar nut (70) and bearing clamp plate (102) at the front end. - the first end of the generator rotor, and a third sub-step to calibrate the generator rotor, the rotor shaft, the compressor wheel, the turbine wheel, the turbine sleeve, the turbine nut, the drawbar, the drawbar nut and WU 20 25 30 35 2001-08-29 E: \ PUBLIC \ DOC \ P \ 411.0-010 SE.d0C Hbg 18 520 612 the bearing clamp plate as a group in the balancing machine, whereby also the wobbling at the turbine outlet is measured; the turbine wheel is also mounted in four different positions with a pitch of 90 ° between them so that the "best" position can be selected in relation to least wobbling and imbalance, the "best" position is marked on the turbine wheel (50), (40), (60 ), the protruding part of the drawbar is measured and documented, the compressor wheel rotor shaft (90), and the drawbar and the length thereof are accompanied by a procedure similar to the first balancing step, which comprises a first sub-step of removing the turbine wheel (50), the compressor wheel (40). ) and the rotor shaft (90), a second lower step for mounting the long balancing sleeve (120) together with the drawbar (60), the drawbar nut (70) and the bearing clamp plate (102), the drawbar being mounted with the same length on its protruding part as in the previous steps; and a third sub-step, wherein 80b) until an imbalance of less than 1.0 gmm is reached, in the case of material on the generator rotor (80a), processed away followed by a procedure similar to the second balancing step, comprising the first sub-step of (120), and the short balancing (60), and the bearing clamping plate (l02); and one removing the long balancing sleeve the second un- (90) together with the drawbar the step of mounting the rotor shaft (130) the rod nut (70) the slewing sleeve pulling third underside, wherein material on the rotor shaft is machined away until an imbalance of less than 3.0 gmm is reached, followed by a procedure similar to the third balancing step, which includes the first sub-step of removing the short balancing sleeve (130), the second un- (40) together with the drawbar and the balance (60), and the bearing clamping plate (102), wherein the pulling step of mounting the compressor wheel (140) the rod nut (70) the ring sleeve of the pulling rod is mounted with the same length on its protruding part as in the previous pieces. own; a third sub-step, wherein material on the compressor wheel is machined away at a suitable 10 U 20 25 30 Q ». ». . 2001-08-29 E: \ PUBLIC \ DOC \ P \ 41l0-0l0 SEJiOC Hbg 19 520 612 plane near the rotor shaft and / or at a suitable plane near the turbine wheel until an imbalance of less than 5 gmm is reached in the plane near the rotor shaft and a imbalance less than 10 gmm is achieved in the plane near the turbine; and a fourth sub-step, the balanced compressor wheel (40) being checked by examining how residual imbalance affects the bearing points of the generator rotor (80a, 80b), followed by a procedure similar to the fourth balancing step, which comprises the first sub-step of taking removing the balancing sleeve (140), the second sub-step of mounting the turbine wheel (50), the turbine sleeve (51), and the turbine nut (52) together with the drawbar (60), the drawbar nut (70) and the bearing clamp plate (102), mounting the drawbar with the same length on its protruding part as in the previous steps; a third sub-step in which the wobbling of the turbine wheel is measured; a fourth sub-step, in which material on the turbine wheel (50) is machined away at a first plane near the compressor wheel (40) and at a second plane near the outlet of the turbine wheel, large amounts of material are machined away with the turbine wheel disassembled, an imbalance of 10 gmm is allowed in the first plane and an imbalance of 5 gmm is allowed in the second plane, a final machining can be performed with (50) balanced following a fifth sub-step, wherein a control (soa, sob), (100, for the sub-turbine wheel mounted; and after the turbine wheel is made at the bearing points of the generator rotor followed by an assembly of the bearing devices 110), (10) check for any remaining imbalance after the final one whereby the rotor unit is complete, the balancing is within the allowable range, and finally the last balancing step "best" position or final balancing steps on all the balanced components belonging to the rotor unit (10). 10 U 20 200l-0B> 29 E: \ PUBLIC \ DOC \ P \ 4ll0f0l0 SE.d0C Hbg 20 520 612 Method for balancing the rotor unit (10) with the second embodiment of the generator rotor (80b) according to claim 9, characterized by the further steps of mounting (61) at the first end of the generator rotor and its associated screw (80b) (50) (62) checking the balanced turbine wheel after performing at the bearing points of the generator rotor (80b), measuring and documenting the wobbling and imbalance of the running holder, removing the running holder, processing material on the running holder at a plane located opposite the magnets on the running holder, (100, is complete, followed by mounting the bearing devices 110) before the running holder, whereby the rotor unit (10) to check that any remaining imbalance of the complete rotor unit is within the allowable range and that the wobbling of the running holder is repeated after the final balancing, and finally the last balancing step refers to marking this "best" position or final balancing steps on all of them balanced components belonging to the rotor unit (10).