EP4399792A1 - Dispositif et methode de determination de la position angulaire d'un rotor de machine electrique tournante - Google Patents
Dispositif et methode de determination de la position angulaire d'un rotor de machine electrique tournanteInfo
- Publication number
- EP4399792A1 EP4399792A1 EP22773149.4A EP22773149A EP4399792A1 EP 4399792 A1 EP4399792 A1 EP 4399792A1 EP 22773149 A EP22773149 A EP 22773149A EP 4399792 A1 EP4399792 A1 EP 4399792A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- rotor
- harmonics
- circuit
- values
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
Definitions
- the present invention relates to a device for determining the angular position of a rotating electrical machine rotor, as well as an assembly comprising such a device.
- the electrical machine is for example an alternator or an alternator-starter powered by a nominal voltage of 12V or 48V, or even more.
- the electric machine can also be a propulsion machine powered by a nominal voltage of 12V or 48V, or even more.
- This electric machine can be integrated into a vehicle with hybrid or purely electric propulsion, for example an automobile. More generally, “vehicle” encompasses within the meaning of the present application any form of mobility with purely electric, hybrid, thermal or other propulsion. "Vehicle” thus includes a machine rolling on earth via four, three, two wheels or any other number of wheels, or a machine moving in the air or
- the control of this electric machine requires knowledge of the angular position of the rotor of the machine. To do this, it is known, in the case of a three-phase synchronous machine, to use several sensors, for example Hall effect or inductive type. The signals provided by these sensors are processed, after mathematical transformation such as
- the accuracy of the position obtained at the output of the rotor position estimation circuit depends largely on the accuracy of the signals acquired by the sensors.
- the magnetic targets of these sensors have magnetization profiles which can generate significant odd order harmonics in the signal provided by these sensors.
- the presence of some of these odd order harmonics at the input of the rotor position estimation circuit can affect the precision of the angular position of the rotor.
- the control of the machine is thus affected.
- even order harmonics can also or alternatively affect the precision of the angular position of the rotor.
- the object of the invention is to meet this need, and it achieves this, according to one of its aspects, with the aid of a device for determining the angular position of a rotor of a rotating electrical machine on the base of signals provided by several position sensors, device comprising:
- this circuit estimating the position of the rotor, in particular via the creation of a control loop, this circuit providing at output a signal representative of the position of the rotor, and
- this predefined harmonics compensation circuit receiving as input:
- this predefined harmonics compensation circuit providing at the output an input of the circuit estimating the position of the rotor, this predefined harmonics compensation circuit being configured for:
- the invention makes it possible to compensate for several predefined harmonics present in the signal resulting from the signals supplied by the position sensors, so that the circuit for estimating the position of the rotor receives as input a signal in which the harmonics in question have been compensated or strongly reduced in terms of their amplitude. This improves the precision of the signal representative of the position of the rotor, and consequently any other control using this signal representative of the position of the rotor. As will be seen later, this compensation may not be dynamic, the signal reconstructed on the basis of the predefined harmonics to be compensated remaining the same throughout the life of the rotating electrical machine, except in the event of any recalibration during a maintenance operation.
- the reconstruction of the signal on the basis of the predefined harmonics to be compensated can be carried out during a calibration operation at the end of the line, just before the departure for delivery of the electrical machine to the customer.
- This reconstructed signal can be qualified as a “pre-reconstructed signal” when this reconstruction is carried out before the use of the electric machine in the vehicle.
- This reconstructed signal corresponds to the harmonic profile that is to be compensated.
- the reconstruction of the signal on the basis of the predefined harmonics to be compensated can be carried out as follows:
- the reconstructed signal is generated by inverse Fourier transform on the basis of the predefined harmonics to be compensated.
- the reconstructed signal can be stored in the storage table in the form of sampled points.
- the most important harmonics are for example those whose amplitude exceeds a given threshold, for example those whose amplitude exceeds a given percentage of the amplitude of the fundamental, such as 0.5%, 1%, 2% or 5% of this amplitude of the fundamental.
- the Fourier transform used is for example a fast Fourier transform (FFT).
- FFT fast Fourier transform
- the signal representing the position of the rotor is for example an angle value with respect to a reference position. It may be the angle characterizing the electrical position or the angle characterizing the mechanical position of the rotor of the electrical machine.
- the harmonic compensation circuit is arranged upstream of the circuit estimating the position of the rotor, this circuit estimating the position of the rotor using in particular a control loop.
- the signal resulting from the signals supplied by the position sensors received at the input of the dynamic processing circuit may have a cosine component and a sine component, the signals coming from the sensors having for example been processed by a circuit configured to apply to said signal a mathematical modeling transformation of a system, in particular of a three-phase system, into a two-phase system.
- This transformation uses for example a Clarke or Concordia matrix.
- the predefined harmonic compensation circuit can:
- the predefined harmonic compensation circuit can:
- first and second conversions make it possible to transform the signal representative of the position of the rotor into input values of the storage table.
- the first conversion of the signal representative of the position of the rotor into a value belonging to the set of first values can consist in transforming this signal into an integer, so that the union of the integers thus obtained corresponds to all of the values of the set of first values. values.
- the second conversion of the signal representing the position of the rotor into a value belonging to the set of second values consists in transforming this signal into an integer, so that the union of the integers thus obtained corresponds to all of the values of the set of second values.
- the first conversion and the second conversion can implement a gain, equal or not from the first to the second conversion, and equal for example to the ratio between the number of points sampled in the first reconstructed signal and stored in the storage table and 2TI, respectively the ratio between the number of points sampled in the second reconstructed signal and stored in the storage table and 2ÎI.
- the cardinal of the set of first values can be equal to the cardinal of the set of second values, for example 8 or 16 or 32 or 64 or 128, or even more.
- this cardinal corresponds to the number of points sampled in the first or second signal reconstructed on the basis of the harmonics to be compensated. It is thus possible to have 8, 16, 32, 64, 128 or more sampled points recorded in the storage table for the first reconstructed signal or for the second reconstructed signal.
- the cardinal of the set of first values can be different from the cardinal of the set of second values.
- the aforementioned first conversion may differ from the aforementioned second conversion so as to take into account the phase shift existing between the cosine component of the signal resulting from the signals supplied by the position sensors and the sine component of this signal.
- an offset intended to compensate for the 90° phase shift can be applied in one of the first and second conversion. It can thus be ensured that the search in the storage table is in phase with the state of the signal from which the output of this table must be subtracted.
- the signal reconstructed on the basis of the predefined harmonics to be compensated contained in the storage table can be frozen. This reconstructed signal may then not change dynamically during use of the rotating electrical machine. It is then not possible, in a dynamic way, to adapt to the evolution over time of the predefined harmonics to be compensated, or to compensate for them again, this evolution being linked to the temperature or to aging, which is counterbalanced by the simplicity of the solution implemented.
- the device may comprise a circuit for dynamic normalization by the amplitude of the first harmonic of each signal coming from a position sensor, this circuit supplying at output the signal resulting from the signals supplied by the position sensors which is itself received at the input of the predefined harmonic compensation circuit.
- This dynamic normalization circuit is thus arranged upstream of the predefined harmonic compensation circuit.
- This dynamic normalization circuit is for example produced according to the teaching of application W02021/121770.
- the compensation of predefined harmonics can be carried out permanently.
- the first and second signals reconstructed on the basis of the predefined harmonics to be compensated can be contained in the same table.
- This table can then contain the values of the first reconstructed signal and the values of the second reconstructed signal.
- the first reconstructed signal and the second reconstructed signal are identical, in which case this table contains only one set of values, these values then being subtracted both from the sine component and from the cosine component of the resulting signal signals provided by the sensors.
- two distinct tables can be provided, a first table being dedicated to the first signal reconstructed on the basis of the predefined harmonics to be compensated, and a second table being dedicated to the second signal reconstructed on the basis of the predefined harmonics to be compensated.
- Another subject of the invention is an assembly comprising:
- a device for controlling this electric machine comprising a determining device as defined above.
- the rotating electrical machine is for example a synchronous machine, for example a three-phase synchronous machine or a synchronous machine whose electrical stator winding defines a double three-phase system.
- the electric stator winding is for example formed by wires or by conductive bars connected to each other.
- the rotor may be a claw rotor.
- This rotor then comprises a first and a second nested pole wheels, the first pole wheel defining a series of claws of generally trapezoidal shape, each claw extending axially in direction of the second pole wheel, the second pole wheel defining a series of claws of generally trapezoidal shape, each claw extending axially in the direction of the first pole wheel.
- a permanent magnet can be received between two consecutive claws circumferentially speaking for the rotor.
- the rotor may be other than a claw rotor, for example comprising a stack of laminations or being a cage rotor.
- the rotor may comprise any number of pairs of poles, for example three, four, six or eight pairs of poles.
- the electrical machine may include a stator cooling circuit in which fluid such as air or liquid circulates.
- fluid such as air or liquid circulates.
- This liquid can be water or oil.
- the rotor can be cooled by this same cooling circuit or by another cooling circuit in which air circulates, or liquid such as water or oil.
- the rotating electrical machine may have a nominal electrical power of 4 kW, 8 kW, 15 kW, 25 kW or more. This rotating electrical machine may have a rated electrical power greater than 50 kW, 100 kW or 300 kW
- This rotating electrical machine can be electrically supplied from an electrical energy storage unit via an inverter/rectifier of the assembly, this inverter/rectifier making it possible, depending on whether the electrical machine operates as a motor or as a generator, to charge a vehicle's on-board network or to be electrically supplied from this network.
- the nominal voltage of the electric energy storage unit can be 12 V, 48 V or have another value, for example another value greater than 300 V, or greater than 800V or greater than 1000V.
- the rotating electrical machine may also include a pulley or any other means of connection to the rest of the vehicle's powertrain.
- the electric machine is for example connected, in particular via a belt, to the crankshaft of the heat engine of the vehicle.
- the electric machine is connected to other locations of the powertrain, for example at the input of the gearbox from the point of view of the torque transiting towards the wheels of the vehicle, at the output of the gearbox from the point from the point of view of the torque transiting towards the wheels of the vehicle, at the level of the gearbox from the point of view of the torque transiting towards the wheels of the vehicle, or even on the front axle or the rear axle of this powertrain.
- the rotating electrical machine is not necessarily a synchronous machine, it can be an asynchronous machine.
- Another subject of the invention is a method for determining the angular position of a rotor of a rotating electrical machine on the basis of signals supplied by several position sensors, in which a determination as defined above.
- This method of determination is for example integrated into a method of controlling the electric machine, in which the angular position of the rotor determined as above is used to control the motor torque and/or the current of the storage unit of electric energy.
- FIG. 1 shows schematically and in axial section an example of a rotating electrical machine to which the invention can be applied
- Figure 2 shows in elevation another type of rotor than that of Figure 1
- FIG. 3 schematically shows the device for determining the position of the rotor of the machine according to a non-limiting example of implementation of the invention
- FIG. 1 a rotating electrical machine 1 polyphase, in particular for a motor vehicle, to which the invention can be applied.
- This rotating electrical machine can form an alternator or an alternator-starter of the vehicle.
- This rotating electrical machine can be powered via a power electronic component 9 comprising an inverter/rectifier by a battery whose nominal voltage is 12 V or 48 V or a value greater than 300 V, for example.
- the rotating electrical machine 1 comprises a casing 2. Inside this casing 2, it further comprises a shaft 3, a rotor 4 integral in rotation with the shaft 3 and a stator 5 surrounding the rotor 4. The rotational movement of the rotor 4 takes place around an axis X.
- the casing 2 comprises a front bearing 6 and a rear bearing 7 which are assembled together. These bearings 6, 7 are hollow in shape and each carry, centrally, a respective ball bearing 10, 11 for the rotational mounting of the shaft 3.
- a pulley 12 is in the example considered fixed on a front end of the shaft 3, at the level of the front bearing 6, for example using a nut resting on the bottom of the cavity of this pulley.
- This pulley 12 makes it possible to transmit the rotational movement to the shaft 3 and it can be connected via a belt to the crankshaft of the heat engine of the vehicle.
- the rear end of shaft 3 carries, here, slip rings belonging to a collector and connected by wire connections to the winding. Brushes belonging to a brush holder 8 are arranged so as to rub on the slip rings.
- the front bearing 6 and the rear bearing 7 may also comprise substantially lateral openings for the passage of air in order to allow the cooling of the rotary electrical machine by circulation of air generated by the rotation of a fan.
- the stator 5 comprises a body 15 in the form of a stack of laminations provided with notches, for example of the semi-closed or open type, equipped with notch insulation for mounting the electric winding polyphase of the stator.
- Each phase comprises a winding 16 passing through the notches of the body 15 and forming, with all the phases, a front bun and a rear bun on either side of the body of the stator.
- the windings 16 are for example obtained from a continuous wire covered with enamel or from conductive elements in the form of a bar such as pins connected together.
- the electrical winding of the stator is for example three-phase, then implementing a star or triangle connection, the outputs of which are connected to the electronic power component 9.
- the rotor 4 of FIG. 1 is a claw rotor. It comprises two pole wheels 17. The first pole wheel 17 is turned towards the electronic power component 9 while the second pole wheel 17 is turned towards the pulley 12.
- Each of the pole wheels 17 comprises a bottom 18 extending radially on either side of the axis X, the wheel defining a series of claws 19 of generally trapezoidal shape.
- Each claw of a pole wheel 17 extends axially in the direction of the other pole wheel from a base arranged on the radially outer periphery of the bottom 18.
- the rotor 4 further comprises, between the radially inner portions 20 and the claws 19, a coil wound on a coil insulator 22.
- the rotor 4 may also include permanent magnets (not shown) interposed between two adjacent claws 19 at the outer periphery of the rotor.
- the rotor 4 can be devoid of such permanent magnets.
- the rotor 4 can still be different from that shown in Figure 1, being for example formed by a stack of sheets, as shown in Figure 2.
- the number of pairs of poles defined by the rotor 4 can be arbitrary, for example be equal to four, six or eight.
- the machine further comprises sensors 20 for measuring the position of the rotor 4, for example three Hall effect sensors, grouped together in the same plastic casing. These sensors are for example positioned at the level of the rear bearing 7 of the machine and they interact with a magnetic target integral in rotation with the rotor.
- the measurements provided by these sensors 20 are used by the device 100 for determining the angular position of the rotor 4, which will now be described with reference to FIGS. 3 and 4.
- the device 100 comprises a circuit 101 carrying out a discretization of the signals acquired by each position sensor 20.
- This circuit 101 carries out for example a sampler/hold function then a mathematical transformation for modeling the system, which is in the three-phase example, into a two-phase system.
- This transformation uses for example a Clarke or Concordia matrix. Other transformations can be used when the number of position sensors is different from three.
- the output signal of this circuit 101 drives a circuit 105 of dynamic normalization by the amplitude of the first harmonic of each signal coming from a position sensor.
- This circuit 105 is for example as described in application WO2021/121770.
- the output of this circuit 105 constitutes one of the inputs of a circuit 102 for compensating predefined harmonics.
- These harmonics are for example the harmonics of order 3, 5, and 7, where appropriate 3, 5, 7, 9 and 11.
- the predefined harmonics can comprise harmonics of even order, for example the rows 2 and 4. This circuit 102 will be described later.
- circuit 105 is not present, so that the output signal from circuit 101 is received as it is at the input of circuit 102 for compensation of predefined harmonics
- the signals at the output of the circuit 102 are received at the input of a circuit 103 supplying at the output a signal representative of the position of the rotor 4, via an angle 0 measured with respect to a reference position of this rotor.
- This angle corresponds in the example described to the electrical angle characterizing the position of the rotor 4, but could alternatively correspond to the mechanical angle characterizing this position.
- This circuit 103 here implements a control loop for the position of the rotor 4.
- the circuit 103 is for example identical to that described in the application WO2021/121770 already cited.
- circuit 102 for compensating predefined harmonics also receives as input, in addition to the output signal of circuit 105, or if necessary of circuit 101 directly, the output of circuit 103, namely the signal representative of the position of rotor 4.
- the signal at the output of circuit 101 (or when the dynamic normalization circuit 105 is present, the signal at the output of this circuit 105), is analyzed in spectral form by Fourier transform in amplitude and in phase, for example via an FFT.
- this analysis in spectral form can be done directly on the signals supplied by the sensors 20.
- High amplitude harmonics are identified. These are, for example, those whose amplitude is greater than a given percentage of the amplitude of the fundamental, for example greater than 0.5% of this amplitude of the fundamental.
- a signal is then reconstructed by inverse Fourier transform on the basis of these identified harmonics alone, which will later be qualified as “predefined” harmonics. These are, for example, harmonics of order 3, 5, 7, 9 and 11.
- first reconstructed signal The signal reconstructed on the basis of the predefined harmonics in the sine component of the signal having undergone the analysis in spectral form, subsequently called “first reconstructed signal” is stored in a first table 110, and the signal reconstructed on the basis of the predefined harmonics in the cosine component of the signal having undergone the spectral analysis, hereinafter called “second reconstructed signal” is stored in a second table 111.
- second reconstructed signal is stored in a second table 111.
- a single and same two-input table stores these first and second reconstructed signals.
- one and the same reconstructed signal used indifferently for the two compensations described later can be stored in a single table.
- the first and the second reconstructed signal are stored in the form of sampling points.
- the entry of the first table 110 here consists of a set of first values whose cardinality corresponds to the number of sampling points of the first reconstructed signal.
- the entry of the second table 111 is constituted by a set of second values whose cardinality corresponds to the number of sampling points of the second reconstructed signal.
- the first and the second signal reconstructed once recorded will no longer evolve during the use of the rotating electrical machine 1, except for a subsequent recalibration operation, for example during a maintenance operation of the rotating electrical machine 1.
- the predefined harmonic compensation circuit 102 is presented in the example of FIG. 4 in the form of two blocks 115 and 116.
- Block 115 receives two inputs: on the one hand at 118 the output signal from circuit 103, which corresponds to the signal representative of the position of rotor 4, and on the other hand at 119 the output signal from circuit 105, which results sensors 20.
- the signal representative of the position of rotor 4 at 118 is firstly processed by two successive components 120 and 121 in the context of a first conversion to be transformed into an integer belonging to the set of first values at the input of the first storage table 110.
- the presence of component 120 ensures that this signal remains between 0 and 2ÎI.
- Component 121 is a gain making it possible to convert the output of component 120 into one of the values of the set of first values, for example into a value between 1 and 32 when the first storage table 110 contains 32 sampling points.
- the value of the gain applied by this component 121 is here equal to the product of the number of sampled points stored in the first table 110 divided by 2n.
- the signal representative of the position of rotor 4 at 118 is furthermore processed by two successive components 122 and 123 within the framework of a second conversion to be transformed into an integer belonging to the set of second values at the input of the second storage table 111.
- the presence of component 122 ensures that this signal remains between 0 and 2n.
- Component 123 is a gain making it possible to convert the output of component 122 into one of the values of the set of second values, for example into a value between 1 and 32 when the second storage table 111 contains 32 sampling points.
- the gain value of component 123 may be the same as that of component 121. This gain value may be equal to the ratio between the number of sampled points stored in second table 111 and 2n.
- the components 120 and 122 can be chosen with respect to each other so that one of them compensates for the phase shift between the cosine component of the signal at 119 with respect to the sine component of this signal.
- the value of the first reconstructed signal is thus obtained corresponding to the value of the sine component of the signal representative of the position of the rotor, at the output of the first table 110, and at the end of the second conversion thus obtains the value of the second reconstructed signal corresponding to the value of the cosine component of the signal representative of the position of the rotor.
- Block 116 receives each of these reconstructed first and second signals as input, as well as the sine and cosine components of the signal at 119 of block 115.
- a first operator 125 the first reconstructed signal output from the first table 110 is subtracted from the sine component of the signal at 119
- a second operator 126 the second reconstructed signal output from the second table 111 is subtracted from the cosine component of the signal at 119.
- the invention is not limited to the example which has just been described. As already mentioned, a single table with two entries can be used, for example.
- the circuit 102 can only process a single signal coming from a sensor 20. There can then exist as many predefined harmonic compensation circuits 102 as there are signals acquired by the sensors 20 to be processed. For example, there are as many distinct predefined harmonic compensation circuits 102 as there are sensors.
- the signal at 119 in the circuit 102 described above can be constituted by two sub-signals which are not sine and cosine components of a signal, but which are signals each coming from a respective 20 sensor.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2109477A FR3126824B1 (fr) | 2021-09-09 | 2021-09-09 | Dispositif de détermination de la position angulaire d’un rotor de machine électrique tournante |
| PCT/EP2022/074319 WO2023036680A1 (fr) | 2021-09-09 | 2022-09-01 | Dispositif et methode de determination de la position angulaire d'un rotor de machine electrique tournante |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4399792A1 true EP4399792A1 (fr) | 2024-07-17 |
Family
ID=78649413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22773149.4A Pending EP4399792A1 (fr) | 2021-09-09 | 2022-09-01 | Dispositif et methode de determination de la position angulaire d'un rotor de machine electrique tournante |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4399792A1 (fr) |
| FR (1) | FR3126824B1 (fr) |
| WO (1) | WO2023036680A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10668822B2 (en) * | 2017-07-25 | 2020-06-02 | GM Global Technology Operations LLC | Elimination of fundamental harmonic position measurement errors in a vector-based position sensing system |
| FR3105655B1 (fr) | 2019-12-20 | 2021-11-26 | Valeo Equip Electr Moteur | Dispositif de détermination de la position angulaire d’un rotor de machine électrique tournante |
-
2021
- 2021-09-09 FR FR2109477A patent/FR3126824B1/fr active Active
-
2022
- 2022-09-01 WO PCT/EP2022/074319 patent/WO2023036680A1/fr not_active Ceased
- 2022-09-01 EP EP22773149.4A patent/EP4399792A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023036680A1 (fr) | 2023-03-16 |
| FR3126824A1 (fr) | 2023-03-10 |
| FR3126824B1 (fr) | 2024-04-26 |
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