EP4229748A1 - Procede et systeme de controle d'une machine electrique determinant des consignes de courant optimales - Google Patents
Procede et systeme de controle d'une machine electrique determinant des consignes de courant optimalesInfo
- Publication number
- EP4229748A1 EP4229748A1 EP21786449.5A EP21786449A EP4229748A1 EP 4229748 A1 EP4229748 A1 EP 4229748A1 EP 21786449 A EP21786449 A EP 21786449A EP 4229748 A1 EP4229748 A1 EP 4229748A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric machine
- current
- voltage
- operating
- threshold
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
Definitions
- the present invention relates to the field of controlling electrical machines, in particular synchronous electrical machines, in particular synchro-reluctant electrical machines assisted by permanent magnets. It is known to have recourse to rotating electric machines such as synchronous electric machines with permanent magnets or synchro-reluctant machines, in particular synchro-reluctant machines assisted by permanent magnets. Such electric machines are, for example, used in the field of propulsion, for example for the generation of motor torques on board a vehicle, such as a motor vehicle.
- Document FR 3051296 A1 describes, for example, a synchro-reluctant machine assisted by permanent magnets.
- a method for controlling such an electric machine generally includes the calculation of so-called “direct” and “quadrature” currents and voltages (also called “quadratic”), which are currents and voltages expressed in a rotating frame linked to the rotor, and the implementation of two controls, one relating to the so-called “direct” quantities, and the other relating to the so-called “quadrature” quantities, in order to determine the voltages to be applied to each phase of the machine rotating. Therefore, determining the referential, direct and quadrature components of the stator current is a crucial step at this level, in order to guarantee an optimal level of performance of the electrical machine.
- the complexity of determining the reference current depends in fact on the nature of the machine used: - For a synchronous machine with smooth poles, the direct and quadratic components of the current can be obtained in a linear and direct manner from the torque requested , and - For other machines, such as synchro-reluctant machines, obtaining the reference components of the stator current requires more sophisticated and more complex methods.
- PRIOR ART The choice of a method for determining the forward and quadrature current setpoints takes into account the desired level of performance and the volume of calculation in real time; subject that has been widely treated by the industrial and academic literature.
- the Maximum Torque Per Ampere (MTPA) method which can be translated as maximum torque per ampere) which determines the direct (Id) and quadrature (Iq) components of the current by an optimal solution of the angle of the stator current vector. It is used when the magnitude of the voltage is below the maximum threshold.
- a defluxing phase (we call defluxing the decrease in flux to increase the speed of rotation of the electrical machine beyond its nominal value without increasing the supply voltage), by feedback of the error on the amplitude of the reference voltage, is integrated when the voltage exceeds the maximum threshold.
- the inductances of the electric machine are assumed to be independent of the current components Id and Iq, which does not make it possible to obtain optimum current components for all types of electric machines.
- the current components Id and Iq are determined by the MTPA method with insertion of a defluxing phase via data tables.
- the tension angle is matched by a torque regulator that uses a desired value and a torque estimator.
- the use of simple data tables does not always make it possible to obtain an optimum control setpoint for the electrical machine.
- the object of the present invention is to control an electrical machine, by determining, in real time, optimum current setpoints for all types of electrical machines.
- the invention relates to a method for controlling an electric machine, in which an operating zone of the electric machine is determined, and current setpoints of the electric machine are determined by means of a recursive algorithm which solves a system of optimization equations with voltage and current constraints which depends on the area of operation and on a model of the electric machine adapted to operation under constraints.
- the recursive algorithm allows real-time control without the use of tables or mapping.
- the determination of the operating zone makes it possible to adapt the current setpoints to the operating constraints of the electric machine, and thus makes it possible to obtain an optimal level of performance of the electric machine.
- the invention relates to a method for controlling an electric machine, in which a threshold is defined for at least one operating variable of said electric machine, and in which the following steps are implemented: a. A dynamic model of said electric machine is constructed, which links the torque of said electric machine to the currents of said electric machine; b. At least two operating zones of said electric machine delimited by said threshold are defined for said at least one operating variable; And the following steps are implemented in real time: c. A torque setpoint of said electric machine and said at least one operating variable of said electric machine are determined; d. The operating zone of said electric machine is identified as a function of said at least one operating variable and of said torque setpoint of said electric machine; e.
- Current setpoints of said electric machine are determined as a function of said torque setpoint by means of a recursive algorithm which solves a system of equations which depends on said identified operating zone and on said dynamic model of said electric machine; f.
- Said electrical machine is controlled by means of said determined current setpoints.
- said at least one operating variable is chosen from among the voltage amplitude of said electric machine, the current amplitude of said electric machine, and the speed of rotation of the rotor of said electric machine.
- At least four operating zones are defined: • A first operating zone for which the current amplitude is lower than a current threshold, and the voltage amplitude is lower than a voltage threshold, • A second zone operating mode for which the current amplitude is greater than or equal to said current threshold, and the voltage amplitude is less than said voltage threshold, • A third operating zone for which the current amplitude is greater than or equal to said threshold current, the voltage amplitude is greater than or equal to said voltage threshold, and the rotational speed of the rotor is lower than the maximum power holding rotational speed of said electric machine, • A fourth operating zone for which the the current amplitude is greater than or equal to said current threshold, the voltage amplitude is greater than or equal to said voltage threshold, and the rotational speed of the rotor is st greater than said maximum power holding rotational speed of said electrical machine.
- a fifth operating zone is defined for which the current amplitude is less than said current threshold, and the voltage amplitude is greater than or equal to said voltage threshold.
- said dynamic model of said machine is constructed electrical from the following equations: and with i d , i q : the direct and quadrature components of the stator current of said electric machine, v d , v q ; the direct and quadrature components of the voltage of said stator of said electric machine, ⁇ the flux of the rotor magnets of said electric machine with ⁇ d the direct flux, and ⁇ q the quadrature flux, ⁇ the electric pulsation, R s the stator resistance, L d the direct inductance of said electric machine, L q the quadrature inductance of said electric machine, C em the torque of the electric machine, P is the number of pairs of poles of said machine electric.
- said recursive algorithm implements, starting from an appropriate initial or previous value, a recursive resolution of Langrange equations of said system of equation, and is written: with X a vector containing the optimal current setpoints and the factors of the contriants of the Lagrange equations of the operating zones, k the time increment, the index y represents the said operating zones, the gradient of the Lagrange equations, Jy,k-1 the Jacobian matrix.
- said recursive algorithm implements a first-order Newton-Raphson method to develop said Jacobian matrix of said system of equations.
- said electric machine is a synchronous electric machine, preferably a synchro-reluctant electric machine assisted by permanent magnets.
- said electric machine is controlled by means of the following steps: i. Voltage setpoints are determined by means of said current setpoints; and ii. An inverter is controlled which controls the supply of said electric machine according to said voltage setpoints.
- said threshold of said at least one operating variable is defined as a function of constraints of use of said electric machine, such as a maximum or a minimum of said operating variable.
- the invention relates to a system for controlling an electric machine comprising an inverter provided with switching arms, a computer and a memory configured to implement the steps of the control method according to one of the preceding characteristics for controlling said electrical machine by means of said inverter.
- FIG. 1 illustrates the steps of the method according to one embodiment of the invention.
- FIG. 2 illustrates several operating zones implemented in an embodiment of the control method according to the invention.
- FIG. 3 illustrates the method and the control system according to one embodiment of the invention.
- FIG. 4 illustrates, for an example, the current setpoints obtained by the method according to one embodiment, as a function of constraints.
- DESCRIPTION OF EMBODIMENTS The present invention relates to a method and a system for controlling an electric machine.
- the electric machine can be a synchronous electric machine, preferably a synchro-reluctant electric machine assisted by permanent magnets.
- the method and the system according to the invention are particularly suitable for this type of electric machine, in particular because the invention makes it possible to take into account the constraints and the operation of all types of machines.
- the method for controlling an electric machine comprises the following steps: - Definition of a threshold for at least one operating variable of the electric machine, preferably a threshold can be defined for several operating variables of the electric machine, - Construction of a dynamic model of the electric machine, the dynamic model relates the torque of the electric machine to the currents of the electric machine, - At least two operating zones of the electric machine are defined, these zones being delimited by the threshold(s) of at least one operating variable of the electric machine, - In real time, a setpoint of torque of the electric machine, - In real time, the operating variable of the electric machine is determined, preferably, several operating variables of the electric machine can be determined, - In real time, the operating zone in which the electric machine is located according to the determined operating variable(s) and the determined torque setpoint, - In real time, the current setpoints of the electric machine are determined according to the torque setpoint, by putting implements a recursive algorithm which solves a system of equations, the system of equations being constructed by means of
- the term "current setpoints" designates either the “direct” and “quadrature” current setpoints, or the current norm and the defluxing angle, or any other equivalent representation. currents.
- the operating variable of the electric machine is called a quantity which characterizes the operation of the electric machine, it may in particular be an electric variable, such as the voltage, the current, or the power of the electric machine, a variable mechanics such as the position, speed or acceleration of the rotor of the electrical machine.
- the operating variable of the electric machine can be chosen from among the voltage amplitude of the electric machine, the current amplitude of the electric machine, and the speed of rotation of the rotor of the electric machine.
- the method according to the invention can implement the following three variables: the voltage amplitude of the electric machine, the current amplitude of the electric machine and the rotational speed of the rotor of the electric machine.
- the term threshold of an operating variable of the electric machine refers to an operating limit of the electric machine linked to the operating variable considered. These thresholds define operating constraints of the electrical machine.
- Such a threshold can be defined as a function of constraints of use of the electric machine, such as a maximum or a minimum of the operating variable concerned. For example: - when the operating variable is the voltage amplitude of the electric machine, the threshold can be the maximum voltage of the electric machine, - when the operating variable is the current amplitude of the electric machine, the threshold may be the maximum current of the electric machine, - when the operating variable is the rotation speed of the rotor of the electric machine, the threshold may be the maximum power holding rotation speed of the electric machine.
- These thresholds can be defined from data from the manufacturers of the electrical machine or from data obtained experimentally. Moreover, according to one embodiment of the invention, these thresholds can be defined by taking into account other variable data of the electric machine, and thus these thresholds can vary over time.
- the thresholds can be constant over time.
- the maximum voltage may depend on the voltage of the battery which supplies the electric machine, this battery voltage being able to be considered as variable and being able to be measured in real time. For example, we can write the following equation:
- V smax mV bat with V smax the maximum voltage of the electrical machine, V bat the battery voltage and m the Pulse Width Modulation (PMI) index used.
- the operating zones of the electrical machine are identified by means of the threshold(s) defined for the operating variable(s) considered. For example, if we consider a single threshold for a single variable, we can identify a first zone for which the operating variable is less than the threshold, and a second zone for which the operating variable is greater than or equal to the threshold.
- At least four operating zones of the electrical machine can be defined: • A first operating zone for which the current amplitude is less than a current threshold (for example the maximum current), and the voltage amplitude is less than a voltage threshold (for example the maximum voltage), • A second operating zone for which the current amplitude is greater than or equal to the current threshold (for example the maximum current), and the voltage amplitude is less than the voltage threshold (for example the maximum voltage), • A third operating zone for which the current amplitude is greater than or equal to the current threshold (for example the maximum current), the voltage amplitude is greater than or equal to the voltage threshold (for example the maximum voltage), and the rotational speed of the rotor is lower than the rotational speed of maximum power maintenance of said electrical machine, • A fourth operating zone for which the current amplitude is greater than or equal to the threshold of current (e.g.
- FIG. 1 illustrates, schematically and in a non-limiting way, the four zones listed above. This figure shows three curves of the electric machine, the torque C, the voltage amplitude V, the current amplitude I as a function of the speed of rotation of the rotor ⁇ .
- the first zone, called zone 1 corresponds to a zone for which the current I is lower than the maximum current I max , and the voltage V is lower than the maximum voltage V max .
- the second zone corresponds to a zone for which the current I is greater than or equal to the maximum current Imax, and the voltage V is less than the maximum voltage V max .
- the third zone corresponds to a zone for which the current I is greater than or equal to the maximum current I max , and the voltage V is greater than or equal to the maximum voltage V max , and the rotational speed ⁇ is lower at the maximum power holding rotation speed ⁇ p,max .
- zone 4 (defluxing zone) corresponds to a zone for which the current I is greater than or equal to the optimum current I opti which is the maximum defluxing current, and the voltage V is greater than or equal to the voltage maximum V max , and the rotational speed ⁇ is greater than or equal to the maximum power holding rotational speed ⁇ p,max Note that these zones make it possible to distinguish the different zones in which the operation of the machine differs due to the operating constraints: at least one of the curves of the torque, of the voltage amplitude, or of the current amplitude is behaves differently when moving from one area to an adjacent area. According to one embodiment of the invention, it is also possible to define a fifth operating zone.
- the current amplitude is lower than the current threshold and the voltage amplitude is higher within the voltage.
- the operating variables of the electric machine are determined, the operating zone of the electric machine is deduced therefrom.
- the operating variables of the electric machine are compared to the defined thresholds of these operating variables to deduce therefrom, in real time, the operating zone (i.e. the current operating zone of electric machine). For the example of FIG. 2, if at a time it is determined that the voltage amplitude is lower than the voltage threshold, and that the current amplitude is greater than the current threshold, then it is considered for this time that the machine is in the second operating zone, zone 2.
- a dynamic model of the electric machine is constructed, which relates the torque of the electric machine to the currents of the electric machine. Several dynamic models of the electric machine can be considered.
- This model makes it possible to take into account the variations of the inductance of the electric machine, which can vary in particular according to the direct and quadrature currents. Moreover, such a model makes it possible to take into account the design of the machine by taking into account in particular the resistance of the stator and the flux of the magnets of the rotor.
- the forward and quadrature inductances can depend on the forward and quadrature currents.
- This embodiment is particularly suitable for synchro-reluctant machines assisted by permanent magnets.
- this embodiment is particularly suitable for synchro-reluctant machines assisted by permanent magnets.
- the forward and quadrature flux components can be respectively .
- the voltage amplitude can be defined using the following equation: with v mod the voltage amplitude, v d the forward voltage, v q the quadrature voltage.
- the torque setpoint of the electric machine can be determined in a conventional manner from a request from the user of the electric machine.
- the torque setpoint can be determined by speed regulation.
- the method according to the invention implements a recursive solution, preferably a recursive solution of two optimization systems with interlaced constraints as a function of the current, of the voltage and the speed of the electric machine, and integrating the variations of the inductances according to the current components of the stator.
- the two optimization systems can be obtained by constructing two Lagrange functions integrating the different constraints considered for this method.
- a recursive algorithm is implemented with a single calculation time step.
- This algorithm is said to be recursive, because the current setpoints at time k (t k in discrete time) depend on the current setpoints at time k-1 (i.e. time t k-1 discrete previous).
- This algorithm aims to solve the minimization problem resulting from the system of equations of the determined operating zone, and thus allows an optimal level of performance of the electrical machine.
- the recursive algorithm preferably uses only the value of the previous time step. This recursive algorithm also has the advantage of not using any data table or cartography to determine the current setpoints.
- Sys2 a second current optimization system, called Sys2, during which the torque setpoint cannot be achieved, as follows:
- C em the electromagnetic torque and its setpoint
- V mod the voltage amplitude
- ⁇ Cem the desired electromagnetic torque Lagrange factor
- ⁇ vmax the maximum voltage Lagrange factor of the Sys1 system.
- FIG. 1 illustrates, schematically and in a non-limiting manner, the steps of the method according to one embodiment of the invention. First, we determine, in real time, an electric machine torque setpoint Cem, and at least one operating variable VAR of the electric machine.
- an operating zone ZON of the electric machine is determined in real time, as a function of the torque setpoint Cem and of the at least one operating variable VAR.
- a MOD dynamic model of the electric machine was built.
- a recursive algorithm ALR is implemented which uses the dynamic model MOD and the identified operating zone ZON to determine current setpoints i d , i q .
- the real-time steps which make it possible to determine the current setpoints i d , i q are denoted DET.
- the electrical machine is controlled CON in real time from the current setpoints i d , i q .
- the step of controlling the electric machine can be implemented by means of the following steps: the voltage setpoints of the electric machine are determined by means of the voltage setpoints determined, by example, for this step, proportional-integral (PI) type regulators can be implemented, and - an inverter is controlled, in particular switches of the inverter, which supplies the electrical machine so as to generate the determined voltage setpoints .
- the control of the inverter can implement a pulse width modulation method PWM (or in English PWM for "Pulse width modulation”), in particular a control method vector, in particular a conventional control of the spatial vector SVM (from the English “Space Vector Modulation”), or any analogous method.
- control system for an electrical machine.
- the control system comprises an inverter, optionally a position and/or speed sensor of the rotor of the electric machine, and a computer and a memory configured to implement the steps of the control method according to one any of the variants or combinations of variants described above.
- control system may include means for measuring the currents in the phases of the electric machine, for example current sensors.
- FIG. 3 is shown, schematically and in a non-limiting manner, an installation comprising a rotating electrical machine MEL associated, for its control, with a control system CON according to the invention (the control system implementing the control method according to the invention).
- the installation also comprises a DC source of electrical energy, such as a direct voltage bus, represented by the voltages +V bat and -V bat .
- the rotating electric machine MEL can be a synchronous rotating machine, with several phases, preferably three phases (alternatively the synchronous electric machine can comprise a number of phases that is a multiple of three, for example six, nine or twelve, or even four or five phases ).
- the electric machine MEL can be a synchronous electric machine with permanent magnets or synchro-reluctant, in particular a three-phase synchro-reluctant rotating machine assisted by permanent magnets.
- the electric machine MEL has three inputs.
- Each input corresponds to a phase of a stator (not shown) of the rotating electrical machine MEL.
- the control system CON is intended to control, over time, the power supply to the rotating machine MEL as a function of target values and/or measured values of predetermined magnitudes.
- the control system CON takes into account a torque setpoint C em* (which can conventionally come from a request from the user of the electric machine, alternatively this torque setpoint can be calculated by speed regulation), and at least one operating variable of the electric machine, for example the speed of rotation ⁇ of the rotor of the electric machine.
- control system and method according to the invention use at least one threshold of at least one operating variable of the electric machine, for example a voltage threshold V max , and a current threshold I max .
- the system and the method according to the invention require data DON which characterize the electric machine MEL, for example the resistance of the stator for the dynamic model of the electric machine.
- the CON control system comprises an OND inverter and various successive control blocks.
- the control system can include, if necessary, a sensor CAP of the angular position of the rotor of the electric machine MEL. Such a sensor makes it possible to determine the angular position ⁇ of the electric machine.
- control system CON may comprise means for measuring the currents i a , i b , i c in the phases of the electric machine, for example current sensors.
- the inverter OND is configured to convey electrical energy between the source +V bat and -V bat and the synchronous electrical machine MEL with variable speed. More specifically, the inverter OND is configured to convey electrical energy between the source +V bat and ⁇ V bat and each phase of the stator of the synchronous electrical machine MEL.
- the inverter OND comprises a first input connected to the source +V bat and -V bat , and three outputs, each connected to a corresponding phase of the stator of the synchronous electric machine MEL.
- the inverter OND further comprises a second input electrically connected to an output of a pulse length modulation block PWM, so that the inverter OND is configured to route electrical energy between the source + V bat and - V bat and the synchronous electric machine MEL according to a commutation control signal applied by the preceding control blocks to the second input of the inverter OND.
- the switching control signal may be such that the inverter OND conveys electrical energy from the source +V bat and -V bat to the electric machine MEL so that the electric machine MEL exhibits an operation commonly referred to as “motor” and/or an operation commonly referred to as “generator”.
- the OND inverter comprises several switching arms (not shown), preferably at least one switching arm for each phase of the electric machine, to transform the DC signal from the source +V bat and -V bat into a signal alternating for the phases of the MEL electric machine.
- Each switch arm has at least one controlled switch.
- each switch of the switching arms can be controlled by means of PWM (Pulse Width Modulation) pulse width modulation.
- the control system and method CON initially comprise a step of determining DET the current setpoints id* and iq* from the torque setpoint C em *, the rotational speed of the rotor ⁇ of the electric machine , current Imax and voltage Vmax thresholds and data DON of the electrical machine.
- This step is implemented by means of the steps described previously, and can correspond to the DET step of FIG. 1.
- At least one PI proportional-integral regulator (preferably two PI regulators or any analogous method) is implemented to determine the voltage setpoints vd* and vq* from the current setpoints id* and iq*.
- the voltage setpoints vd* and vq* are converted into a switching control signal for the inverter OND first by means of a Park transformation TRA (to change the reference of the voltage setpoints), then in a second step time, by means PWM pulse width modulation, for example by means of spatial vector control, or any analogous method.
- the simplified dynamic model (only the quadrature inductance depends on the current) is implemented with a closed-loop control of the electric machine, according to the embodiment of Figure 3 (the maximum voltage being defined from the battery voltage and the PWM index used).
- the following operating variables are considered: the current amplitude, the voltage amplitude, and the rotational speed of the rotor of the electrical machine, and the four operating zones are defined, as illustrated in figure 2.
- Figure 4 illustrates, for this example, the constraints and the control of the electrical machine in a frame of current setpoints i d in A, i q in A.
- the current constraint Ismax is represented by a circle
- the voltage constraints V smax are represented by a shape having substantially that of an eye or quasi-ellipse given the dependence of the inductances on the currents id and iq.
- This figure also shows a reference REF to be followed by means of a control method.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2010560A FR3115425B1 (fr) | 2020-10-15 | 2020-10-15 | Procédé et système de contrôle d’une machine électrique déterminant des consignes de courant optimales |
| PCT/EP2021/077112 WO2022078778A1 (fr) | 2020-10-15 | 2021-10-01 | Procede et systeme de controle d'une machine electrique determinant des consignes de courant optimales |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4229748A1 true EP4229748A1 (fr) | 2023-08-23 |
Family
ID=74125409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21786449.5A Pending EP4229748A1 (fr) | 2020-10-15 | 2021-10-01 | Procede et systeme de controle d'une machine electrique determinant des consignes de courant optimales |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4229748A1 (fr) |
| FR (1) | FR3115425B1 (fr) |
| WO (1) | WO2022078778A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3142631B1 (fr) | 2022-11-29 | 2024-11-15 | Ifp Energies Now | Procédé de commande d’une machine électrique pilotée par un onduleur commandé par un calculateur |
| FR3143237B1 (fr) | 2022-12-12 | 2024-12-13 | Ifp Energies Now | Procédé de commande d’une machine électrique pilotée par un onduleur pourvu d’une pluralité de bras de commutation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6936991B2 (en) | 2002-06-03 | 2005-08-30 | Ballard Power Systems Corporation | Method and apparatus for motor control |
| US7586286B2 (en) | 2006-11-17 | 2009-09-08 | Continental Automotive Systems Us, Inc. | Method and apparatus for motor control |
| KR101689793B1 (ko) * | 2010-01-25 | 2017-01-09 | 삼성전자 주식회사 | 모터 제어장치 및 모터 제어 방법 |
| JP5120669B2 (ja) * | 2010-03-31 | 2013-01-16 | アイシン・エィ・ダブリュ株式会社 | 電動機駆動装置の制御装置 |
| US9614473B1 (en) | 2015-12-24 | 2017-04-04 | Infineon Technologies Ag | Flux weakening AC motor control by voltage vector angle deflection |
| FR3051296B1 (fr) | 2016-05-12 | 2020-12-18 | Ifp Energies Now | Machine electrique avec un rotor comprenant une cavite pour l'equilibrage dynamique de ce rotor |
-
2020
- 2020-10-15 FR FR2010560A patent/FR3115425B1/fr active Active
-
2021
- 2021-10-01 EP EP21786449.5A patent/EP4229748A1/fr active Pending
- 2021-10-01 WO PCT/EP2021/077112 patent/WO2022078778A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022078778A1 (fr) | 2022-04-21 |
| FR3115425B1 (fr) | 2023-06-09 |
| FR3115425A1 (fr) | 2022-04-22 |
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