Turbine engine comprising a module for correcting a torsional mode of a transmission line connected to an electric machine and associated method
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SAFRAN ELECTRICAL & POWER
- Filing Date
- 2024-08-22
- Publication Date
- 2026-07-08
Smart Images
Figure EP2024073572_06032025_PF_FP_ABST
Abstract
Description
Turbomachine comprising a module for correcting a torsion mode of a transmission line connected to an electric machine and associated method
[0001] The present invention relates to the field of electrical machines embedded in a turbomachine of an aircraft in order to achieve hybrid propulsion. The invention is particularly advantageous for an electrical machine connected to a propulsion shaft of an aircraft turbomachine via a transmission line, this electrical machine being configured to operate in a motor mode to rotate the propulsion shaft or in a generator mode to generate electrical energy.
[0002] Climate change is a major concern for many legislative and regulatory bodies around the world. Indeed, various carbon emission restrictions have been, are being, or will be adopted by various states. In particular, an ambitious standard applies to both new aircraft types and those already in operation, requiring the implementation of technological solutions to ensure their compliance with current regulations. Civil aviation has been mobilizing for several years now to contribute to the fight against climate change.
[0003] Technological research efforts have already led to very significant improvements in the environmental performance of aircraft. The Applicant takes into consideration the factors impacting all phases of design and development to obtain less energy-intensive, more environmentally friendly aeronautical components and products whose integration and use in civil aviation have moderate environmental consequences with the aim of improving the energy efficiency of aircraft.
[0004] Consequently, the Applicant is constantly working to reduce its negative climate impact by using methods and operating virtuous development and manufacturing processes and minimizing greenhouse gas emissions to the minimum possible in order to reduce the environmental footprint of its activity.
[0005] This sustained research and development work focuses on new generations of aircraft engines, the weight reduction of aircraft, particularly through the materials used and lighter on-board equipment, the development of the use of electrical technologies to ensure propulsion, and, as an essential complement to technological progress, aeronautical biofuels.
[0006] It is known in the prior art to mount an electric machine on a propulsion shaft of an aircraft turbomachine, for example a fan shaft, in order to obtain a hybrid turbomachine. The electric machine is in particular configured to operate in a generator mode in order to take mechanical power from the propulsion shaft so as to generate electrical power. The electric machine is also configured to operate in a motor mode in order to provide mechanical power to the propulsion shaft by taking electrical power, for example, from an electric battery.
[0007] With reference to, in order to facilitate the integration of the electric machine 1, it has been proposed to connect it to a propulsion shaft of the Ahp turbomachine by a transmission line 2 comprising an internal transmission box 21 known by its English designation “IGB” for “Internal Gear Box”, a radial transmission shaft 22 known by its English designation “RDS” for “Radial Drive Shaft” and an accessory relay box 23, known by its English designation “AGB” for “Accessory Gear Box”. In a known manner, the electric machine 1 comprises a stator 11 and a rotor 12 configured to magnetically interact with the stator 11. The aircraft turbomachine 1 comprises a control device 203 configured to receive a setpoint torque TRQcons and determine the currents flowing in the stator 11 so that the rotor 12 provides an electric machine torque in accordance with the setpoint torque TRQcons.
[0008] In practice, during operation of the transmission line 2 in motor or generator mode, a torsion mode Mt is likely to appear in the transmission line 2. A torsion mode Mt corresponds in particular to an oscillation of torque and speed at a torsion frequency. The torsion mode Mt may manifest itself for example in the form of a torsion of the radial transmission shaft 22, that is to say, an angular offset between two longitudinal portions of the radial transmission shaft 22.
[0009] Such a torsion mode Mt affects the performance of the transmission line 2 and can induce excitations or resonances which lead to premature wear of the elements of the transmission line 2 but also wear of the electrical machine 1.
[0010] An immediate solution would be to increase the stiffness of transmission line 2 to reduce the torsional mode Mt. Such a solution is not feasible since it would increase the mass of transmission line 2 as well as its bulk, which would partly ruin the advantages associated with hybridization.
[0011] A device for controlling a torsion mode in an electrical generation system, which allows the torsion frequency to be estimated and uses a bandpass filter, is known from patent application EP3849074A1. A backlash-based damping system is also known from Yang Ming et al., “Shaft torque limiting control using shaft torque compensator for two-inertia elastic system with backlash,” IEEE / ASME Transactions on mechatronics, IEEE service center, Piscataway, NJ, US, vol. 21, no. 6, 01-12-2016, pp. 2902-2911.
[0012] The invention thus aims to eliminate at least some of these drawbacks. PRESENTATION OF THE INVENTION
[0013] The invention relates to an aircraft turbomachine comprising at least one propulsion shaft and an electrical machine connected to the propulsion shaft by a transmission line configured to transmit a mechanical torque between the propulsion shaft and the electrical machine, the electrical machine being configured to receive a setpoint torque, the transmission line being subjected to a torsion mode having an estimated torsion frequency, the electrical machine comprising a stator and a rotor configured to interact magnetically with the stator, the electrical machine being configured to operate, on the one hand, in a generator mode in order to take mechanical power from the rotor to generate electrical power and to operate, on the other hand, in a motor mode in order to consume electrical power to generate mechanical power and drive the rotor,the aircraft turbomachine comprising a control device configured to determine the currents flowing in the stator so that the rotor provides an electric machine torque in accordance with a control torque.,
[0014] The aircraft turbomachine is remarkable in that the control device comprises a correction module configured to correct the torsion mode of the transmission line, said correction module being configured to:Determine a time measurement of a rotor torque parameter designated "time measurement", over a frequency range encompassing the estimated torsion frequency, designated "monitoring range", andCalculate a correction torque from the time measurement over the monitoring range.
[0015] The control device is configured to calculate the control torque from the setpoint torque and the correction torque.
[0016] Thus, thanks to the invention, the torsion mode of the transmission line is corrected dynamically both during a transient regime and during a steady state, which makes it possible to increase the service life of the electric machine and the transmission line, by reducing the torque variations of the electric machine. Such a correction is also advantageous when the electric machine operates in a motor mode or a generator mode. The transitions between the two modes are also facilitated. In steady state, the correction is small, which saves the electric machine and prevents its untimely use.
[0017] Furthermore, since the damping is implemented in software, there is no need to add a mechanical part with a weight penalty that would require replacement. Advantageously, there is no need to add new sensors to the electric machine, which facilitates integration.
[0018] In one aspect, the driveline comprises at least one radial driveshaft and an accessory relay box. Such a driveline is particularly efficient but subject to a torsion mode.
[0019] In one aspect, the transmission line comprises at least one internal transmission housing. In one aspect, the transmission line comprises at least one adapter housing.
[0020] In one aspect, the turbomachine is hybrid and includes a combustion chamber for generating an exhaust flow to rotate the propulsion shaft.
[0021] In one aspect, the correction module includes a gain operator having a gain for multiplying the time measurement. This advantageously allows the rate of correction of the torsion mode to be adjusted.
[0022] In one aspect, the correction module comprises a high-pass filter for cutting frequencies below the monitoring range. Preferably, the high-pass filter has a cutoff frequency corresponding to a lower bound Fte1 of the monitoring range, the lower bound being between Fte / 3 and Fte / 2, Fte being the estimated twist frequency. This makes it possible to eliminate all high-frequency noise to improve the correction.
[0023] In one aspect, the correction module includes a low-pass filter to cut off frequencies above the monitoring range.
[0024] According to one aspect, the correction module comprises a saturator to limit the correction torque and thus allow optimal regulation.
[0025] Preferably, the monitoring range has a length between 10 Hz and 50 Hz. Such a reduced length makes it possible to precisely target the actual torsion frequency while allowing for an admissible variation linked to wear and the particular specificities of each transmission line.
[0026] In one aspect, the control device includes a sensor configured to measure the speed of the rotor of the electric machine, the speed of the rotor of the electric machine corresponding to the time measurement.
[0027] According to one aspect, the control device is configured to determine control currents of the electric machine from the control torque.
[0028] In one aspect, the time measurement is determined from the control currents of the electrical machine.
[0029] Also presented is a method for correcting the torsion mode of the transmission line of the aircraft turbomachine as presented previously, the electric machine receiving a setpoint torque, the method comprising steps consisting of:Determining a time measurement of a rotor torque parameter designated "time measurement", over a frequency range encompassing the estimated torsion frequency, designated "monitoring range",Calculating a correction torque from the time measurement over the monitoring range, andCalculating a control torque from the setpoint torque and the correction torque. PRESENTATION OF FIGURES
[0030] The invention will be better understood upon reading the following description, given by way of example, and referring to the following figures, given by way of non-limiting examples, in which identical references are given to similar objects.
[0031] This is a schematic representation of an aircraft turbomachine according to the prior art.
[0032] This is a schematic representation of an aircraft turbomachine according to one embodiment of the invention.
[0033] This is a schematic representation of a measurement of the torsion torque at the adaptation box, in time (curve 3a) and in frequency (curve 3b), when the correction is inactive (A).
[0034] This is a schematic representation of the electrical machine control device including a correction module.
[0035] This is a schematic representation of the correction module.
[0036] This is a schematic representation of the measurement of the torsion torque at the level of the adaptation box, in time (curve 6a) and in frequency (curve 6b), when the correction is active (B).
[0037] This is a schematic representation of the torque variations of the electric machine when the correction is inactive (A) and active (B) for a first torque setpoint.
[0038] This is a schematic representation of the torque variations of the electric machine when the correction is inactive (A) and active (B) for a second torque setpoint.
[0039] It should be noted that the figures set out the invention in detail to implement the invention, said figures can of course be used to better define the invention where appropriate. DETAILED DESCRIPTION OF THE INVENTION
[0040] With reference to the, there is shown an aircraft turbomachine T comprising a low pressure compressor 101, a high pressure compressor 102, a high pressure turbine 103 and a low pressure turbine 104. A low pressure shaft Abp connects the low pressure compressor 101 to the low pressure turbine 104. A high pressure shaft Ahp connects the high pressure compressor 102 to the high pressure turbine 103. A fan 100 is mounted integrally with the low pressure shaft Abp. The aircraft turbomachine T comprises a combustion chamber (not shown) for consuming a mixture of fuel and a pressurized air flow accelerated by the compressors 101, 102. An exhaust flow makes it possible to rotate the turbines 103, 104. The high pressure shaft Ahp and the low pressure shaft Abp are both propulsion shafts since they are main shafts which participate in the propulsion.The architecture of such an aircraft turbomachine T is known to those skilled in the art and will not be presented in further detail.
[0041] In this example, the aircraft turbomachine T is hybrid and comprises an electrical machine 1 connected to the high pressure shaft Ahp by a transmission line 2 configured to transmit a mechanical torque between the high pressure shaft Ahp and the electrical machine 1. It nevertheless goes without saying that the invention also applies to an electrical machine 1 connected to the low pressure shaft Abp by a transmission line 2.
[0042] In this example, with reference to the, the transmission line 2 preferably comprises successively from the high pressure shaft Ahp to the electric machine 1: an internal transmission box 21, known by its English designation "IGB" for "Internal Gear Box", a radial transmission shaft 22, known by its English designation "RDS" for "Radial Drive Shaft", an accessory relay box 23, known by its English designation "AGB" for "Accessory Gear Box", and an adapter box 24, known by its English designation "GBX" for "GearBox".
[0043] The internal transmission housing 21 comprises gears and is housed as close as possible to the high pressure shaft Ahp to enable power to be transmitted / received. The radial transmission shaft 22 preferably extends in a radial arm of the turbomachine T in order to cross a stream of air accelerated by the fan 100. The radial transmission shaft 22 has a degree of flexibility and is particularly sensitive to a torsion mode Mt. The accessory relay housing 23 comprises a plurality of gears to receive different accessories such as a starter, a lubrication device, etc.
[0044] In this example, optionally, the transmission line 2 comprises an adaptation box 24 configured to adapt the speed from the accessory relay box 23 in order to allow the electrical machine 1 to generate electrical energy with high efficiency. Preferably, the adaptation box 24 comprises a device for measuring the torque of the transmission line 2, in particular a torque meter.
[0045] It stands to reason that transmission line 2 could have a different structure.
[0046] As previously indicated, the transmission line 2 is subjected to a torsion mode Mt having an actual torsion frequency Ftr which is not necessarily known precisely. Indeed, the actual torsion frequency Ftr is variable between each aircraft turbomachine T and between each transmission line 2 due to the different settings and the different wear. The actual torsion frequency Ftr thus changes as a function of time and conditions.
[0047] The transmission line 2 can be modeled by a damping system connecting, on the one hand, the electrical machine 1 having a high rigidity and, on the other hand, the high pressure shaft Ahp. The damping system comprises a torsional stiffness according to two degrees of freedom in the reference frame of the electrical machine 1. The torsional stiffness is advantageously defined in a plane orthogonal to the axis of the electrical machine 1.
[0048] As will be presented later, the correction is optimal in the present case given that the inertia ratio of the electric machine 1 on the high pressure shaft Ahp is low, for example, of the order of 1 / 40.
[0049] The torsion mode Mt can manifest itself for example in the form of a torsion of the radial transmission shaft 22, that is to say, an angular offset between two longitudinal portions of the radial transmission shaft 22.
[0050] As an example, with reference to the, a measurement of the mechanical torque received by the adaptation box 24 is shown in the absence of correction in time (curve 3a) and in frequency (curve 3b). In this example, the actual torsion frequency Ftr is of the order of 25 Hz.
[0051] As will be presented later, an estimated torsion frequency Fte is determined by calculation, in particular, from a mathematical model of the transmission line 2, by simulation or by feedback.
[0052] Advantageously, a frequency range encompassing the estimated torsion frequency Fte, designated "monitoring range Ps", is determined from the estimated torsion frequency Fte. This monitoring range Ps comprises a lower bound Fte1 and an upper bound Fte2. The monitoring range Ps is preferably centered on the estimated torsion frequency Fte but it goes without saying that it could be offset from said estimated torsion frequency Fte.
[0053] Preferably, the monitoring range Ps has a length, i.e. a gap between its lower limit Fte1 and its upper limit Fte2, of between 10 Hz and 50 Hz. Such a monitoring range Ps is sufficiently wide to encompass the possible variations of the estimated torsion frequency Fte and sufficiently narrow to avoid encompassing undesirable frequencies. Preferably, the lower limit Fte1 is between Fte / 3 and Fte / 2. Preferably, the upper limit Fte2 is between 2*Fte and 3*Fte.
[0054] In this example, the estimated torsion frequency Fte has been estimated to be 23 Hz and the monitoring range Ps is equal to [10 Hz; 50 Hz] and thus has a length of 40 Hz.
[0055] With reference to the, the electric machine 1 comprises a stator 11 fixedly mounted in the turbomachine T and a rotor 12 connected to the transmission line 2, in particular, to the adapter box 24. In the absence of an adapter box 24, the rotor 12 is connected directly to the accessory relay box 23. The rotor 12 is rotatably mounted relative to the stator 11 along an electric machine axis X. The rotor 12 is configured to interact magnetically with the stator 11. The electric machine 1 is for example of the permanent magnet synchronous machine (PMSM) type, or of the wound rotor machine type. The electric machine used is for example a permanent magnet synchronous machine mounted on the surface of the rotor without mechanical damper.
[0056] The electrical machine 1 is configured, on the one hand, to operate in a generator mode in order to draw mechanical power from the rotor 12 (in this example from the high pressure shaft Ahp) to generate electrical power and to operate, on the other hand, in a motor mode in order to consume electrical power to generate mechanical power and drive the rotor 12 and the high pressure shaft Ahp.
[0057] Still with reference to the, the aircraft turbomachine T further comprises a control device 3 configured to receive a setpoint torque TRQcons. The setpoint torque TRQcons is preferably determined by a computer of the turbomachine T or of the aircraft, for example in order to achieve the chosen hybridization rate.
[0058] An exemplary embodiment of a control device 3 is illustrated in. The control device 3 is configured to determine the currents flowing in the stator 11 so that the rotor 12 provides an electric machine torque TRQ in accordance with a control torque TRQ*. The control device 3 comprises, in a known manner, a unit 31 for determining a setpoint reverse current Iq* from the control torque TRQ*. The control device 3 also comprises a unit 32 for determining a setpoint forward current Id*. The setpoint currents Iq*, Id* are converted into a setpoint voltage Vq*, Vd* by a conversion unit 33 after integration of the setpoint currents Iq*, Id* by PI (Proportional Integral) operators from current measurements of the currents Iq, Id flowing in the stator 11 of the electric machine 1.
[0059] In this example, currents Iabc are measured at the stator 11 of the electric machine 1 and are converted vectorially into a direct current Id and a reverse current Iq by knowing an angular position θ of the rotor 12 relative to the stator 11. The electric machine 1 is controlled via a vector control dq as illustrated in.
[0060] The conversion unit 33 determines the set voltages Vq*, Vd* by knowing the speed w of the rotor 12 relative to the stator 11 in order to carry out defluxing. Preferably, the speed w of the rotor 12 is obtained by integrating the angular position θ.
[0061] According to one aspect, the angular position θ of the rotor 12 relative to the stator 11 is obtained by a monitoring unit 36 which can be connected to an angular sensor 37 or to an observation unit (not shown) which makes it possible to determine the angular position θ from the measurement of the control currents Iabc.
[0062] The setpoint voltages Vq*, Vd* from the conversion unit 33 are transformed into a control voltage Vabc* by a dq / abc converter and then processed by a control unit 34 in order to provide a control parameter (PWM signal for example) to an inverter 35 supplying the electrical machine 1, in particular, its stator 11.
[0063] The general structure of a control device 3 is known to those skilled in the art and will not be presented in more detail.
[0064] According to the invention, the control device 3 comprises a correction module 4 configured to correct the torsion mode Mt of the transmission line 2. This advantageously makes it possible to reduce the torque variations of the electrical machine 1 and thus improve its service life.
[0065] The correction module 4 is configured to:Determine a time measurement Mw of the variations of a torque parameter of the rotor 12 of the electrical machine 1, hereinafter referred to as “time measurement”, andCalculate a correction torque TRQcorr from the time measurement Mw over the monitoring range Ps.
[0066] The control device 3 is configured to calculate a control torque TRQ* from the setpoint torque TRQcons and the correction torque TRQcorr. In this example, with reference to the, the control device 3 comprises a subtractor 38 configured to determine the control torque TRQ* by subtracting the correction torque TRQcorr from the setpoint torque TRQcons. Thus, the control torque TRQ* no longer necessarily corresponds to the setpoint torque TRQcons as in the prior art.
[0067] Thus, the correction module 4 makes it possible to measure the variations induced by the torsion mode Mt in order to determine a correction torque TRQcorr which modifies the setpoint torque TRQcons. In other words, the correction module 4 implements active and dynamic compensation in order to control the electrical machine 1 taking into account the torsion mode Mt to increase its service life. The correction torque TRQcorr is injected in phase opposition with the torque and speed disturbance linked to the torsion mode Mt, which achieves a damping effect.
[0068] With reference to the, there is shown schematically an embodiment of a correction module 4. In this example, the correction module 4 successively comprises a low-pass filter 41, a high-pass filter 42, a gain operator 43 having a gain Kp and a saturator 44.
[0069] The low-pass filter 41 is configured to perform a frequency cutoff at the upper limit Fte2 of the monitoring range Ps. This advantageously makes it possible to remove high-frequency noise that is not related to the torsion mode Mt. Such a low-pass filter 41 is optional when the time measurement Mw has been obtained by a monitoring unit 36 already implementing low-pass filtering.
[0070] The high-pass filter 42 is configured to perform a frequency cutoff at the lower limit Fte1 of the monitoring range Ps. This advantageously makes it possible to remove the average component of the time measurement and to keep only the wave component of the time measurement.
[0071] The gain operator 43 makes it possible to determine the desired correction level. It is preferably determined as a function of the torsional stiffness of the damping system representing the transmission line 2. The gain Kp makes it possible to calibrate the correction so that it is effective while avoiding the risk of instability.
[0072] The saturator 44 advantageously makes it possible to limit the value of the correction torque TRQcorr so as not to make the correction unstable while allowing reactive correction. It is important that the correction torque TRQcorr remains low compared to the setpoint torque TRQcons, for example, less than 10% in transient mode of the turbomachine T and less than 1% in steady state.
[0073] An example of implementation of a method for correcting a torsion mode of the transmission line 2 will now be presented.
[0074] The method comprises steps consisting of:Determining a time measurement Mw of a torque parameter of the rotor 12 designated “time measurement Mw”, over a frequency range encompassing the estimated torsion frequency Fte, designated “monitoring range Ps”,Calculating a correction torque TRQcorr from the time measurement Mw over the monitoring range Ps, andCalculating a control torque TRQ* from the setpoint torque TRQcons and the correction torque TRQcorr.
[0075] With reference to the, a measurement of the mechanical torque received by the adaptation box 24 is shown during a correction in time (curve 6a) and in frequency (curve 6b). If we compare to the, the variations of the mechanical torque are reduced significantly. The real torsion frequency Ftr has been compensated and is no longer visible on the frequency spectrum of curve 6b.
[0076] This illustrates a measurement signal S1 of the mechanical torque variations over time for a setpoint torque TRQcons of the order of -10 NM (generator mode) in the absence of correction (phase A) and in the presence of correction (phase B). It is advantageous to note that the variations are strongly attenuated in the presence of correction (phase B). The correction is also reactive, the oscillations disappearing in three periods. The effectiveness of the correction is also visible on which illustrates a measurement signal S2 of the mechanical torque variations over time for another setpoint torque TRQcons of the order of -20 Nm (generator mode) in the absence of correction (phase A) and in the presence of correction (phase B). The correction is thus robust for a large range of TRQcons setpoints.
[0077] By means of the invention, a torsion mode of a transmission line of a hybrid turbomachine can be effectively corrected by dynamic correction of the control of the electric machine, which increases its service life.
Claims
Aircraft turbomachine (T) comprising at least one propulsion shaft (Ahp) and an electrical machine (1) connected to the propulsion shaft (Ahp) by a transmission line (2) configured to transmit a mechanical torque between the propulsion shaft (Ahp) and the electrical machine (1), the electrical machine (1) being configured to receive a setpoint torque (TRQcons), the transmission line (2) being subjected to a torsion mode (Mt) having an estimated torsion frequency (Fte), the transmission line (2) comprising at least one radial transmission shaft (22) and an accessory relay box (23), the electrical machine (1) comprising a stator (11) and a rotor (12) configured to interact magnetically with the stator (11), the electrical machine (1) being configured to operate, on the one hand, in a generator mode in order to draw mechanical power from the rotor (12) to generate electrical power and to operate, on the other hand,according to a motor mode in order to consume electrical power to generate mechanical power and drive the rotor (12), the aircraft turbomachine (T) comprising a control device (3) configured to determine the currents flowing in the stator (11) so that the rotor (12) provides an electric machine torque (TRQ) in accordance with a control torque (TRQ*), aircraft turbomachine (T) characterized in that the control device (3) comprises a correction module (4) configured to correct the torsion mode (Mt) of the transmission line (2), the correction module (4) being configured to:Determine a time measurement (Mw) of a torque parameter of the rotor (12) designated "time measurement (Mw)", over a frequency range encompassing the estimated torsion frequency (Fte), designated "monitoring range (Ps)",the monitoring range (Ps) having a length between 10 Hz and 50 Hz andCalculating a correction torque (TRQcorr) from the time measurement (Mw) over the monitoring range (Ps),The control device (3) being configured to calculate the control torque (TRQ*) from the setpoint torque (TRQcons) and the correction torque (TRQcorr)., Aircraft turbomachine (T) according to claim 1, wherein the correction module (4) comprises a gain operator (43) having a gain (Kp) for multiplying the time measurement (Mw). Aircraft turbomachine (T) according to one of claims 1 to 2, in which the correction module (4) comprises a high-pass filter (42) for cutting off frequencies below the monitoring range (Ps). Aircraft turbomachine (T) according to claim 3, in which the high-pass filter (42) has a cut-off frequency corresponding to a lower limit Fte1 of the monitoring range (Ps), the lower limit (Fte1) being between Fte / 3 and Fte / 2, Fte being the estimated torsion frequency. Aircraft turbomachine (T) according to one of claims 1 to 4, in which the correction module (4) comprises a low-pass filter (41) for cutting off frequencies above the monitoring range (Ps). Aircraft turbomachine (T) according to one of claims 1 to 5, in which the correction module (4) comprises a saturator (44) for limiting the correction torque (TRQcorr). Aircraft turbomachine (T) according to one of claims 1 to 6, in which the control device (3) is configured to determine control currents (Iabc) of the electric machine (1) from the control torque (TRQ*). Method for correcting the torsion mode of the transmission line (2) of the aircraft turbomachine (T) according to one of claims 1 to 7, the electric machine (1) receiving a setpoint torque (TRQcons), the method comprising steps consisting of:Determining a time measurement (Mw) of a torque parameter of the rotor (12) designated "time measurement (Mw)", over a frequency range encompassing the estimated torsion frequency (Fte), designated "monitoring range (Ps)",Calculating a correction torque (TRQcorr) from the time measurement (Mw) over the monitoring range (Ps), andCalculating a control torque (TRQ*) from the setpoint torque (TRQcons) and the correction torque (TRQcorr).