EP2596374A1 - Method of detecting a fault in a permanent-magnet alternator and power supply device comprising a detection module - Google Patents

Method of detecting a fault in a permanent-magnet alternator and power supply device comprising a detection module

Info

Publication number
EP2596374A1
EP2596374A1 EP11735864.8A EP11735864A EP2596374A1 EP 2596374 A1 EP2596374 A1 EP 2596374A1 EP 11735864 A EP11735864 A EP 11735864A EP 2596374 A1 EP2596374 A1 EP 2596374A1
Authority
EP
European Patent Office
Prior art keywords
alternator
phase
phases
voltage
determining
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.)
Withdrawn
Application number
EP11735864.8A
Other languages
German (de)
French (fr)
Inventor
Virginie Erdos
Thanh-Tuan Truong
Mehdi Dallagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Electronics and Defense SAS
Original Assignee
Sagem Defense Securite SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sagem Defense Securite SA filed Critical Sagem Defense Securite SA
Publication of EP2596374A1 publication Critical patent/EP2596374A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels

Definitions

  • the present invention relates to a method of def ⁇ fault detection of an alternator.
  • the invention is applicable to various types of alternators and, in particular, alternators with permanent magnet or PMA of the English "Permanent Magnet Alternator", with or without neutral.
  • the alternator is connected to the computer by a supply device implementing a pulse width modulation type PWM or PWM control, better known by the abbreviation PWM of the English "Pulse Width Modulation".
  • the device comprises a control stage and a power stage.
  • the control stage receives a setpoint signal and supplies, to the power stage, a control signal modulated according to a predetermined duty cycle ⁇ born.
  • the power stage is connected, on the one hand, to the alternator via a filter and a rectifier and, on the other hand, to the rest of the computer to which the power stage provides a voltage corresponding to the control signal.
  • the power stage comprises for example at least one switching transistor driven by the control signal.
  • a control loop is provided for guaran ⁇ shooting performance required by the computer (in terms of accuracy and response time).
  • one of the main concerns is the detection of failures and, preferably, the identification of failed components. It is thus known to provide a failure detection from a voltage measurement performed to cha ⁇ phase of the alternator, for example a zero voltage on one phase being indicative of the failure cet- stage you. It is also possible to reveal seven cases of failure (three cases of individual failures, three cases of simultaneous failures of two phases and a case of breakdown if ⁇ multa Avenue all phases). This makes it possible to identify the defective phase but not to identify the type of failure, namely a short circuit of a phase with the ground, a short circuit between phase or open circuit in the phase.
  • An object of the invention is to provide a simple means for detecting and identifying failures when powering a load by an alternator.
  • a failure detection method for an alternator provided ⁇ sant a three phase electrical current to a load, the method comprising the steps of:
  • the fault detection is performed using the duty cycle which is a magnitude representative of the phase equilibrium of the alternator.
  • the value of the duty cycle on each phase and the comparison of the cyclic ratio between phases, associated with the phase shift between phases, makes it possible to identify a faulty phase and to identify the type of failure: namely a circuit or green ⁇ or a short circuit. circuit between phases or with ground or neutral.
  • the output voltage of the alternator is converted into square wave before ⁇ termination of the duty ratio and the phase shift.
  • the square wave is configured to maintain the duty cycle and phase and more easily enables subsequent processing to extract them than with a sinusoidal signal.
  • the output voltage of the alternator is filtered before determining the duty cycle and the phase shift.
  • the voltage depends on the speed of rotation of the alternator so that at low speeds rota ⁇ voltage is not exploitable by the load and is removed by filtering.
  • the invention also relates to a power supply device, comprising a control stage, a power stage, and a fault detection module arranged to implement the method of the invention.
  • FIG. 1 diagrammatically represents a feed dis ⁇ ⁇ positive according to the invention
  • FIG. 2 is a table illustrating the di ⁇ to the case of failure.
  • the invention relates to a feed device, generally designated 1, for connecting an alternator 50 to a load 100 to feed it.
  • the alternator 50 is arranged to supply a three-phase current whose voltage is a function of the rotational speed of the alternator.
  • the load 100 is for example a calculator such as those which are embedded on the aircraft to ensure the operation of mechanical parts thereof, such as engines.
  • the feeder generally desig ⁇ nied by 1, comprises a control stage 2, a power stage 3, and a fault detection module 4.
  • the output stage 3 has an input connected to connection means 5 to the alternator 50 via a filter 6 and a rectifier 7.
  • the control stage 2 is arranged to provide in a manner known in itself to the power stage 3 so ⁇ control gnal modulated according to a predefined duty cycle ⁇ completed based on a reference signal (the signal command is PWM type - pulse width modulation).
  • the power stage 3 comprises, in a manner known per se, transistors having a control input receiving the control signal for controlling the transistors in their conduction state and their blocking state as a function of the duty cycle.
  • the current flowing in the transistors is transmitted to the load 100.
  • the detection module is connected to the output of the filter 6 via a conditioning unit 8 arranged to transform the sinusoidal signal leaving the filter into a square signal having the same duty cycle and the same phase as the original signal.
  • the detection module 4 is arranged to implement a fault detection method.
  • This process comprises the steps of:
  • phase difference between the phases A and B, or DephAB is equal to the phase shift between the phases B and C, or DephBC, and is equal to 120 ° while the phase difference between the phases A and C, or DephAC, is 240 °.
  • phase A_cc_neutre The short-circuit of phase A with the neutral, or external short-circuit noted PhaseA_cc_neutre, is revealed when the cyclic ratio of phase B, or RCB, is equal to the duty cycle of phase C, or RCC, while the duty cycle of the phase A, or RCA, is NCI ⁇ laughing at RCB.
  • PhaseA_cc_masse The short-circuit of the phase A with the mass, or internal short-circuit noted PhaseA_cc_masse, is revealed when RCA is worth 0% while RCB is equal to RCC and DephBC is equal to 60 °.
  • Paseah & B_cc A short circuit between the phases A and B, denoted Paseah & B_cc is revealed when the three reports cycli ⁇ c are equal and DephAB sucks.
  • Paseah & c_cc A short circuit between the phases A and C, denoted Paseah & c_cc is revealed when the three reports cycli ⁇ c are equal and DephAC sucks.
  • PhaseA_CO An open circuit of phase A, denoted PhaseA_CO, is revealed when RCA is equal to 0%, RCB is equal to RCC and DephBC is equal to 180 °.
  • PhaseAB_cc_masse A short circuit of the phases A and B with the mass, noted PhaseAB_cc_masse, is revealed when RCA is equal to RCB and RCC is equal to 0%.
  • PhaseAB_cc_neutre A short circuit of the phases A and B with the neu ⁇ tre, denoted PhaseAB_cc_neutre, is revealed when the three cyclic ratios are equal and DephAB is zero.
  • Phasea AB_CO An open circuit of phases A and B, denoted Phasea AB_CO, is revealed when the three duty cycles are equal to 0%.
  • PhaseAC_cc_neutre A short circuit of the phases A and C with the neu ⁇ tre, denoted PhaseAC_cc_neutre, is revealed when the three cyclic ratios are equal and DephAC is zero.
  • PhaseaAC_CO An open circuit of phases A and C, denoted PhaseaAC_CO, is revealed when the three cyclic ratios are equal to 0%.
  • the feed device may have a different structure from that described as said structure allows the implementation of the method of the invention.

Abstract

Method of detecting a fault in an alternator (50) providing a three-phase electric current to a load (100), the method comprising the steps of: - determining a duty ratio of each of the phases at the output of the alternator, - determining a phase shift between the phases at the output of the alternator, - determining a presence of a fault as a function of the phase shift and of a comparison of the duty ratios. Power supply device for the implementation of this method.

Description

Procédé de détection de panne d'un alternateur  Alternator failure detection method
à aimant permanent et dispositif d'alimentation comportant un module de détection  with permanent magnet and supply device comprising a detection module
La présente invention concerne un procédé de dé¬ tection de panne d'un alternateur. The present invention relates to a method of def ¬ fault detection of an alternator.
L'invention est applicable à différents types d'alternateurs et, notamment, aux alternateurs à aimant permanent ou PMA de l'anglais « Permanent Magnet Alterna- tor », avec ou sans neutre.  The invention is applicable to various types of alternators and, in particular, alternators with permanent magnet or PMA of the English "Permanent Magnet Alternator", with or without neutral.
Dans les avions, sont présents des calculateurs alimentés par un alternateur triphasé entraîné par le mo¬ teur de l'avion. In airplanes, are present computers powered by a three-phase alternator driven by the mo ¬ tor of the aircraft.
L'alternateur est relié au calculateur par un dispositif d'alimentation mettant en œuvre une commande de type à modulation de largeur d'impulsion ou MLI, plus connue sous l'abréviation PWM de l'anglais « Puise Width Modulation ».  The alternator is connected to the computer by a supply device implementing a pulse width modulation type PWM or PWM control, better known by the abbreviation PWM of the English "Pulse Width Modulation".
Le dispositif comprend un étage de commande et un étage de puissance. L'étage de commande reçoit un signal de consigne et fournit, à l'étage de puissance, un signal de commande modulé selon un rapport cyclique prédétermi¬ né. L'étage de puissance est relié, d'une part, à l'alternateur via un filtre et un redresseur et, d'autre part, au reste du calculateur auquel l'étage de puissance fournit une tension correspondant au signal de commande. A cette fin, l'étage de puissance comprend par exemple au moins un transistor de découpage piloté par le signal de commande. Une boucle de régulation est prévue pour garan¬ tir les performances exigées par le calculateur (en terme de précision et de temps de réponse) . The device comprises a control stage and a power stage. The control stage receives a setpoint signal and supplies, to the power stage, a control signal modulated according to a predetermined duty cycle ¬ born. The power stage is connected, on the one hand, to the alternator via a filter and a rectifier and, on the other hand, to the rest of the computer to which the power stage provides a voltage corresponding to the control signal. For this purpose, the power stage comprises for example at least one switching transistor driven by the control signal. A control loop is provided for guaran ¬ shooting performance required by the computer (in terms of accuracy and response time).
Dans cette application, où une défaillance du calculateur pourrait avoir des conséquences considérées comme critiques, l'une des préoccupations principales est la détection des pannes et, de préférence, l'identification des composants défaillants. Il est ainsi connu de réaliser une détection de panne à partir d'une mesure de tension réalisée pour cha¬ que phase de l'alternateur, par exemple une tension nulle sur une phase étant révélatrice de la défaillance de cet- te phase. Il est aussi possible de révéler sept cas de panne (trois cas de pannes individuelles, trois cas de pannes simultanées de deux phases et un cas de panne si¬ multanée de toutes les phases) . Ceci permet bien d'identifier la phase défectueuse mais pas d'identifier le type de panne à savoir court-circuit d'une phase avec la masse, court-circuit entre phase ou circuit ouvert dans la phase. In this application, where a failure of the computer could have consequences considered critical, one of the main concerns is the detection of failures and, preferably, the identification of failed components. It is thus known to provide a failure detection from a voltage measurement performed to cha ¬ phase of the alternator, for example a zero voltage on one phase being indicative of the failure cet- stage you. It is also possible to reveal seven cases of failure (three cases of individual failures, three cases of simultaneous failures of two phases and a case of breakdown if ¬ multanée all phases). This makes it possible to identify the defective phase but not to identify the type of failure, namely a short circuit of a phase with the ground, a short circuit between phase or open circuit in the phase.
Un but de l'invention est de fournir un moyen simple permettant de détecter et d'identifier des défail- lances lors de l'alimentation d'une charge par un alternateur .  An object of the invention is to provide a simple means for detecting and identifying failures when powering a load by an alternator.
A cet effet, on prévoit, selon l'invention, un procédé de détection de panne d'un alternateur fournis¬ sant un courant électrique triphasé à une charge, le pro- cédé comprenant les étapes de : For this purpose there is provided according to the invention, a failure detection method for an alternator provided ¬ sant a three phase electrical current to a load, the method comprising the steps of:
- déterminer un rapport cyclique de chacune des phases en sortie de l'alternateur,  determining a cyclic ratio of each of the phases at the output of the alternator,
- déterminer un déphasage entre les phases en sortie de l'alternateur,  determining a phase difference between the phases at the output of the alternator,
- déterminer une présence de panne en fonction du déphasage et d'une comparaison des rapports cycliques.  - determine a presence of failure as a function of the phase shift and a comparison of the cyclic ratios.
La détection de panne est réalisée en utilisant le rapport cyclique qui est une grandeur représentative de l'équilibre des phases de l'alternateur. La valeur du rapport cyclique sur chaque phase et la comparaison du rapport cyclique entre phases, associé au déphasage entre phases, permet d'identifier une phase défaillante et d'identifier le type de panne : à savoir un circuit ou¬ vert ou un court-circuit entre phases ou avec la masse ou le neutre. Avantageusement, la tension en sortie de l'alternateur est transformée en signal carré avant dé¬ termination du rapport cyclique et du déphasage. The fault detection is performed using the duty cycle which is a magnitude representative of the phase equilibrium of the alternator. The value of the duty cycle on each phase and the comparison of the cyclic ratio between phases, associated with the phase shift between phases, makes it possible to identify a faulty phase and to identify the type of failure: namely a circuit or green ¬ or a short circuit. circuit between phases or with ground or neutral. Advantageously, the output voltage of the alternator is converted into square wave before ¬ termination of the duty ratio and the phase shift.
Le signal carré est configuré pour conserver le rapport cyclique et la phase et permet plus facilement le traitement ultérieur en vue d' en extraire ceux-ci qu' avec un signal sinusoïdal.  The square wave is configured to maintain the duty cycle and phase and more easily enables subsequent processing to extract them than with a sinusoidal signal.
De préférence, la tension en sortie de l'alternateur est filtrée avant détermination du rapport cyclique et du déphasage.  Preferably, the output voltage of the alternator is filtered before determining the duty cycle and the phase shift.
La tension dépend de la vitesse de rotation de l'alternateur de sorte qu'aux faibles vitesses de rota¬ tion la tension n'est pas exploitable par la charge et est éliminé par le filtrage. The voltage depends on the speed of rotation of the alternator so that at low speeds rota ¬ voltage is not exploitable by the load and is removed by filtering.
L'invention a également pour objet un dispositif d'alimentation, comportant un étage de commande, un étage de puissance, et un module de détection de panne agencé pour mettre en œuvre le procédé de l'invention.  The invention also relates to a power supply device, comprising a control stage, a power stage, and a fault detection module arranged to implement the method of the invention.
D'autres caractéristiques et avantages de l'invention ressortiront , à la lecture de la description qui suit, d'un mode de mise en œuvre particulier non li¬ mitatif de l'invention. Other characteristics and advantages of the invention will emerge on reading the description which follows, of a particular embodiment non- ¬ mitative of the invention.
Il sera fait référence aux dessins annexés, parmi lesquels :  Reference will be made to the appended drawings, among which:
- la figure 1 représente schématiquement un dis¬ positif d'alimentation conforme à l'invention, FIG. 1 diagrammatically represents a feed dis¬ ¬ positive according to the invention,
- la figure 2 est un tableau illustrant les di¬ vers cas de panne. FIG. 2 is a table illustrating the di ¬ to the case of failure.
En référence aux figures, l'invention concerne un dispositif d'alimentation, généralement désigné en 1, destiné à relier un alternateur 50 à une charge 100 pour alimenter celle-ci.  Referring to the figures, the invention relates to a feed device, generally designated 1, for connecting an alternator 50 to a load 100 to feed it.
L'alternateur 50 est agencé pour fournir un courant triphasé dont la tension est fonction de la vitesse de rotation de l'alternateur. La charge 100 est par exemple un calculateur tel que ceux qui sont embarqués sur les avions pour assurer le fonctionnement des organes mécaniques de celui-ci, comme les moteurs. The alternator 50 is arranged to supply a three-phase current whose voltage is a function of the rotational speed of the alternator. The load 100 is for example a calculator such as those which are embedded on the aircraft to ensure the operation of mechanical parts thereof, such as engines.
Le dispositif d'alimentation, généralement dési¬ gné en 1, comporte un étage de commande 2, un étage de puissance 3, et un module de détection de panne 4. L'étage de puissance 3 a une entrée reliée à des moyens de liaison 5 à l'alternateur 50 via un filtre 6 et un re- dresseur 7. The feeder, generally desig ¬ nied by 1, comprises a control stage 2, a power stage 3, and a fault detection module 4. The output stage 3 has an input connected to connection means 5 to the alternator 50 via a filter 6 and a rectifier 7.
L'étage de commande 2 est agencé pour fournir de façon connue en elle-même à l'étage de puissance 3 un si¬ gnal de commande modulé selon un rapport cyclique prédé¬ terminé en fonction d'un signal de consigne (le signal de commande est de type MLI - modulation de largeur d' impulsion) . The control stage 2 is arranged to provide in a manner known in itself to the power stage 3 so ¬ control gnal modulated according to a predefined duty cycle ¬ completed based on a reference signal (the signal command is PWM type - pulse width modulation).
L'étage de puissance 3 comprend de manière connue en elle-même des transistors ayant une entrée de commande recevant le signal de commande pour piloter les transis- tors dans leur état de conduction et leur état de blocage en fonction du rapport cyclique. Le courant passant dans les transistors est transmis à la charge 100.  The power stage 3 comprises, in a manner known per se, transistors having a control input receiving the control signal for controlling the transistors in their conduction state and their blocking state as a function of the duty cycle. The current flowing in the transistors is transmitted to the load 100.
Le module de détection est relié à la sortie du filtre 6 via une unité de conditionnement 8 agencée pour transformer le signal sinusoïdal sortant du filtre en un signal carré comportant le même rapport cyclique et la même phase que le signal d'origine.  The detection module is connected to the output of the filter 6 via a conditioning unit 8 arranged to transform the sinusoidal signal leaving the filter into a square signal having the same duty cycle and the same phase as the original signal.
Le module de détection 4 est agencé pour mettre en œuvre un procédé de détection de panne.  The detection module 4 is arranged to implement a fault detection method.
Ce procédé comprend les étapes de :  This process comprises the steps of:
- déterminer le rapport cyclique de chacune des phases en sortie de l'alternateur,  determining the duty cycle of each of the phases at the output of the alternator,
- déterminer un déphasage entre les phases en sortie de l'alternateur,  determining a phase difference between the phases at the output of the alternator,
- déterminer une présence de panne en fonction du déphasage, de la valeur du rapport cyclique sur chaque phase, et de la comparaison des rapports cycliques entre phases . - determine a presence of failure according to the phase shift, the value of the duty cycle on each phase, and the comparison of the cyclic ratios between phases.
Ceci permet de détecter des pannes de l'alternateur et l'information correspondante est envoyée au poste de pilotage par le module de détection 4.  This makes it possible to detect faults of the alternator and the corresponding information is sent to the cockpit by the detection module 4.
En mode nominal de fonctionnement, le déphasage entre les phases A et B, ou DephAB, est égal au déphasage entre les phases B et C, ou DephBC, et vaut 120° tandis que le déphasage entre les phases A et C, ou DephAC, vaut 240° .  In nominal mode of operation, the phase difference between the phases A and B, or DephAB, is equal to the phase shift between the phases B and C, or DephBC, and is equal to 120 ° while the phase difference between the phases A and C, or DephAC, is 240 °.
Le tableau de la figure 2 résume les différents cas de panne.  The table in Figure 2 summarizes the different cases of failure.
Les cas de panne de la phase A vont maintenant être listés.  Phase A failure cases will now be listed.
Le court-circuit de la phase A avec le neutre, ou court-circuit externe noté PhaseA_cc_neutre, est révélé lorsque le rapport cyclique de la phase B, ou RCB, est égal au rapport cyclique de la phase C, ou RCC, tandis que le rapport cyclique de la phase A, ou RCA, est infé¬ rieur à RCB. The short-circuit of phase A with the neutral, or external short-circuit noted PhaseA_cc_neutre, is revealed when the cyclic ratio of phase B, or RCB, is equal to the duty cycle of phase C, or RCC, while the duty cycle of the phase A, or RCA, is NCI ¬ laughing at RCB.
Le court-circuit de la phase A avec la masse, ou court-circuit interne noté PhaseA_cc_masse, est révélé lorsque RCA vaut 0% tandis que RCB est égal à RCC et DephBC est égal à 60°.  The short-circuit of the phase A with the mass, or internal short-circuit noted PhaseA_cc_masse, is revealed when RCA is worth 0% while RCB is equal to RCC and DephBC is equal to 60 °.
Un court-circuit entre les phases A et B, noté PhaseA&B_cc, est révélé lorsque les trois rapports cycli¬ ques sont égaux et DephAB est nul. A short circuit between the phases A and B, denoted Paseah & B_cc is revealed when the three reports cycli ¬ c are equal and DephAB sucks.
Un court-circuit entre les phases A et C, noté PhaseA&C_cc, est révélé lorsque les trois rapports cycli¬ ques sont égaux et DephAC est nul. A short circuit between the phases A and C, denoted Paseah & c_cc is revealed when the three reports cycli ¬ c are equal and DephAC sucks.
Un circuit-ouvert de la phase A, noté PhaseA_CO, est révélé lorsque RCA est égal à 0%, RCB est égal à RCC et DephBC vaut 180° .  An open circuit of phase A, denoted PhaseA_CO, is revealed when RCA is equal to 0%, RCB is equal to RCC and DephBC is equal to 180 °.
Un court-circuit des phases A et B avec la masse, noté PhaseAB_cc_masse, est révélé lorsque RCA est égal à RCB et RCC est égal à 0%. A short circuit of the phases A and B with the mass, noted PhaseAB_cc_masse, is revealed when RCA is equal to RCB and RCC is equal to 0%.
Un court-circuit des phases A et B avec le neu¬ tre, noté PhaseAB_cc_neutre, est révélé lorsque les trois rapports cycliques sont égaux et DephAB est nul. A short circuit of the phases A and B with the neu ¬ tre, denoted PhaseAB_cc_neutre, is revealed when the three cyclic ratios are equal and DephAB is zero.
Un circuit-ouvert des phases A et B, noté Pha- seAB_CO, est révélé lorsque les trois rapports cycliques sont égaux à 0%.  An open circuit of phases A and B, denoted Phasea AB_CO, is revealed when the three duty cycles are equal to 0%.
Un court-circuit des phases A et C avec la masse, noté PhaseAC_cc_masse, est révélé lorsque RCA=RCC et RCB= 0%.  A short circuit of the phases A and C with the mass, noted PhaseAC_cc_masse, is revealed when RCA = RCC and RCB = 0%.
Un court-circuit des phases A et C avec le neu¬ tre, noté PhaseAC_cc_neutre, est révélé lorsque les trois rapports cycliques sont égaux et DephAC est nul. A short circuit of the phases A and C with the neu ¬ tre, denoted PhaseAC_cc_neutre, is revealed when the three cyclic ratios are equal and DephAC is zero.
Un circuit-ouvert des phases A et C, noté Pha- seAC_CO, est révélé lorsque les trois rapports cycliques sont égaux à 0%.  An open circuit of phases A and C, denoted PhaseaAC_CO, is revealed when the three cyclic ratios are equal to 0%.
Une défectuosité de toutes les phases se traduit également par l'égalité de tous les rapports cucliques à 0% .  A failure of all phases also results in the equality of all the cuclic ratios at 0%.
Il est facile de déduire les autres cas de pannes affectant les phases B et C respectivement.  It is easy to deduce the other cases of faults affecting phases B and C respectively.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits mais englobe toute variante entrant dans le champ de l'invention telle que définie par les revendications.  Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims.
En particulier, le dispositif d'alimentation peut avoir une structure différente de celle décrite tant que ladite structure permet la mise en œuvre du procédé de l'invention.  In particular, the feed device may have a different structure from that described as said structure allows the implementation of the method of the invention.

Claims

REVENDICATIONS
1. Procédé de détection de panne d'un alternateur (50) fournissant un courant électrique triphasé à une charge (100), caractérisé en ce que le procédé comprend les étapes de : A failure detection method of an alternator (50) providing a three-phase electric current to a load (100), characterized in that the method comprises the steps of:
- déterminer un rapport cyclique des phases en sor¬ tie de l'alternateur sur chacune des phases de celui-ci, - determining a duty cycle of phases sor ¬ tie alternator on each phase thereof,
- déterminer un déphasage entre les phases en sor¬ tie de l'alternateur, - determining a phase difference between the phases sor ¬ tie of the alternator,
- déterminer une présence de panne en fonction du déphasage et d'une comparaison des rapports cycliques.  - determine a presence of failure as a function of the phase shift and a comparison of the cyclic ratios.
2. Procédé selon la revendication 1, dans lequel la tension en sortie de l'alternateur (50) est transformée en signal carré avant détermination du rapport cyclique et du déphasage .  2. Method according to claim 1, wherein the output voltage of the alternator (50) is converted into a square signal before determining the duty cycle and the phase shift.
3. Procédé selon la revendication 1, dans lequel la tension en sortie de l'alternateur (50) est filtrée avant détermination du rapport cyclique et du déphasage.  3. The method of claim 1, wherein the voltage output of the alternator (50) is filtered before determining the duty cycle and phase shift.
4. Dispositif d'alimentation (1) comportant des moyens de liaison (3) à un alternateur triphasé (50), un étage de commande (2), un étage de puissance (3), et un mo¬ dule de détection de panne (4) agencé pour mettre en œuvre un procédé conforme à l'une quelconque des revendications précédentes . 4. The supply device (1) having connection means (3) to a three-phase alternator (50), a control stage (2), a power stage (3), and a mo ¬ failure detection dule (4) arranged to implement a method according to any one of the preceding claims.
5. Dispositif selon la revendication 4, dans laquelle entre les moyens de liaison (5) et l'étage de puis¬ sance (3) sont montés un filtre (6) et un redresseur (7), le module de détection (4) étant relié pour recevoir la tension après filtrage mais avant redressement. 5. Device according to claim 4, wherein between the connecting means (5) and the ¬ sance stage (3) are mounted a filter (6) and a rectifier (7), the detection module (4) being connected to receive the voltage after filtering but before recovery.
6. Dispositif selon la revendication 4, dans lequel le module de détection (4) comprend en entrée une unité de conditionnement (8) agencée pour transformer en signal carré la tension.  6. Device according to claim 4, wherein the detection module (4) comprises an input conditioning unit (8) arranged to transform the square voltage voltage.
EP11735864.8A 2010-07-19 2011-07-18 Method of detecting a fault in a permanent-magnet alternator and power supply device comprising a detection module Withdrawn EP2596374A1 (en)

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FR1055871A FR2962810B1 (en) 2010-07-19 2010-07-19 METHOD FOR DETECTING FAILURE OF A PERMANENT MAGNET ALTERNATOR AND FEEDING DEVICE COMPRISING A DETECTION MODULE
PCT/EP2011/062250 WO2012010557A1 (en) 2010-07-19 2011-07-18 Method of detecting a fault in a permanent-magnet alternator and power supply device comprising a detection module

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US20130187678A1 (en) 2013-07-25
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WO2012010557A1 (en) 2012-01-26
CN103026249A (en) 2013-04-03
FR2962810A1 (en) 2012-01-20
US8692572B2 (en) 2014-04-08

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