EP2338065A1 - Procédé et dispositif pour le diagnostic de défauts de liaison entre un circuit d'attaque et une machine électrique - Google Patents

Procédé et dispositif pour le diagnostic de défauts de liaison entre un circuit d'attaque et une machine électrique

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Publication number
EP2338065A1
EP2338065A1 EP09783025A EP09783025A EP2338065A1 EP 2338065 A1 EP2338065 A1 EP 2338065A1 EP 09783025 A EP09783025 A EP 09783025A EP 09783025 A EP09783025 A EP 09783025A EP 2338065 A1 EP2338065 A1 EP 2338065A1
Authority
EP
European Patent Office
Prior art keywords
potential
drive circuits
output
outputs
drive
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Withdrawn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
EP09783025A
Other languages
German (de)
English (en)
Inventor
Michael-Juergen Hofmann
Lars-Daniel Rinze
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2338065A1 publication Critical patent/EP2338065A1/fr
Withdrawn legal-status Critical Current

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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • 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
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies

Definitions

  • the invention relates to a method for detecting interrupted connection lines between a driver circuit and an electrical machine, in particular a three-phase motor, and a device for carrying out such a method.
  • Polyphase electrical machines e.g. Three-phase motors are usually controlled by means of a so-called inverter power stage.
  • the inverter power stage has for each phase of the electric machine two separately controllable electrical power switches, for example in the form of power transistors, IGBTs and the like.
  • One of the circuit breakers associated with a particular phase is associated with a high supply potential and another circuit breaker associated with a particular phase with a low supply potential. Between the two circuit breakers is the connection for the assigned phase connection of the electrical machine.
  • the electrical circuit breakers are controlled by means of a control circuit such that a circuit breaker of a particular phase connected to the high supply potential and at least one of the circuit breakers connected to the low supply potential are closed, while all other circuit breakers are open.
  • a Current path defined by the electric machine to effect a driving force is controlled by means of a control circuit such that a circuit breaker of a particular phase connected to the high supply potential and at least one of the circuit breakers connected to the low supply potential are closed, while all other circuit breakers are open.
  • the inverter power stage is usually formed due to the necessary switching speeds and because of the high power converted there by means of separate transistors and the like, which are controlled by means of the control circuit.
  • the control is carried out according to a desired mode of the electric machine by pulses of a certain frequency and a certain duration.
  • each of the power transistors with its drain terminal and its source terminal is also connected to the control circuit.
  • the connection of the drain terminal of each of the power transistors enables the realization of an open-load detection in the control circuit.
  • the open-load detection it is determined whether a fixed potential is applied to the drain terminal of the corresponding power transistor or whether the drain terminal is floating (has a floating potential).
  • an open-load fault is reported on each of the power transistors when all of the power transistors are open. Thus, it can not be distinguished whether there is a physical interruption of a line connection, or whether all power transistors are open according to the control and thus no interruption of a line connection has occurred.
  • a method for detecting a disconnection of a line connection between a power stage having a plurality of drive circuits and an electric machine.
  • the drive circuits are configured to selectively apply one of one or more specified potentials to an output of the respective drive circuit or to separate the output of the respective drive circuit from the specified potentials.
  • the electrical machine is provided with a plurality of interconnected phase windings which are contactable via phase terminals, wherein the output of each of the drive circuits is in each case connected to a phase connection via a corresponding connection line.
  • the procedure comprises the following steps: ⁇ Applying a defined potential to at least one of them
  • the detection is performed by detecting at the output or the outputs of one or more of the remaining drive circuits whether there is a floating potential or that it is connected to a fixed potential. It is noted that there is an interruption of at least one of the line connections between the power stage and the electrical machine, depending on whether at one or more of the outputs of the remaining drive circuits, a presence of a floating potential is detected.
  • One idea of the above method is to check the functionality of the line connections between the power stage and the electrical machine by an often already provided detection, if there is a floating potential at the output or the outputs of one or more, in particular all other drive circuits a fixed potential is used.
  • the detection as to whether there is a floating potential at the output or the outputs of all other drive circuits or that is connected to a fixed potential can be performed by means of an open-load detection on a power transistor in the corresponding drive circuit.
  • a detection current can be impressed on a terminal of the power transistor associated with the corresponding drive circuit connected to the output of the one drive circuit, wherein it is determined at the relevant output, depending on the potential which is established by application of the detection current, whether the potential at the output of the drive circuit is floating or connected to a fixed potential.
  • the potential which arises at the respective output can be compared in a threshold value comparison with a predetermined reference potential, wherein, depending on the result of the threshold value comparison, an interruption of the line connection is detected.
  • At least three connection lines for connecting at least three drive circuits to corresponding phase terminals of the electrical machine can be provided, wherein it is determined that an interruption of the line control associated with a drive circuit is provided. Is present binding, if at all outputs of the remaining drive circuits, a presence of a floating potential is detected.
  • connection lines can be provided for connecting at least three drive circuits to corresponding phase connections of the electrical machine, the method comprising the further steps:
  • one of the fixed potentials can be applied to each of the outputs of the drive circuits, wherein at at least one of the outputs of the drive circuits a fixed potential different from a reference potential is applied via a respective internal resistance so that the voltage at the at least one output of the the potential applied to the remaining drive circuits is modifiable by an electrical connection with a different specified potential at an output of one of the remaining drive circuits, the detection potential being a function of the potential occurring at the at least one of the outputs of the drive circuits and at least one output of the remaining ones Control circuits applied potential is determined.
  • the detection potential can be formed with the aid of a resistance network, wherein the resistance network has a measuring node at -5, which communicates with the at least one of the outputs of the drive circuits and the at least one output of the remaining drive circuits first resistors is connected and which is connected to the reference potential via a second resistor.
  • the determination that an interruption 5 of at least one of the line connections between the power stage and the electrical machine is present is carried out depending on a result of a threshold comparison of the detection potential with a predetermined threshold potential.
  • an apparatus for detecting a disconnection of a line connection between a power stage and an electric machine is provided.
  • the power stage is formed with a plurality of drive circuits for selectively applying one of one or more specified potentials to an output of the respective drive circuit or for disconnecting the output of the respective drive circuit from the specified potentials.
  • the electrical machine is provided with a plurality of interconnected phase windings which can be contacted via phase connections.
  • the output of each of the drive circuits is connected to an associated one of the phase terminals via a respective one of the connection lines.
  • the device comprises a control unit which is designed:
  • ⁇ using a detector circuit to perform a detection to detect a detection potential that depends on the potential at one of the outputs of the drive circuits or the potentials at a plurality of the outputs of the drive circuits; and, depending on the result of the detection, determining that there is an interruption of at least one of the line connections between the power stage and the electrical machine.
  • control circuit may be designed to control the drive circuits in such a way that a defined potential is applied via the output 5 of one of the drive circuits, the output or the outputs of all other drive circuits being controlled by the respective drive control. circuit are separated from the specified potentials.
  • the detector circuit can detect at the output or the outputs of one or more of the remaining drive circuits whether there is a floating potential or that it is connected to a fixed potential.
  • the control circuit may be configured to determine that there is an interruption of at least one of the line connections between the power stage and the electrical machine, depending on whether a presence of a floating potential is detected at the one or more of the outputs of the remaining drive circuits.
  • the detector circuit may comprise a current source for impressing a detection current to a terminal of the power transistor associated with the corresponding drive circuit associated with the output of the one drive circuit, and a comparator circuit for comparing the potential set at the respective output in a threshold comparison to compare a predetermined reference potential, wherein an interruption of the line connection is detected depending on the result of the threshold value comparison.
  • At least three connecting lines can be provided for connecting at least three drive circuits to corresponding phase terminals of the electrical machine, wherein the control unit is designed to determine that there is an interruption of the line connection assigned to one drive connection, if at all outputs of the remaining drive circuits Presence of a floating potential is detected.
  • control circuit may be configured to drive the drive circuits to apply one of the fixed potentials to each of the outputs of the drive circuits, wherein at least one of the outputs of the drive circuits applies a predetermined potential other than a reference potential via an associated internal resistance so that this potential is provided by an electrical connection across the line connections between the
  • control circuit can be designed to determine the detection potential as a function of the potential which is established at the at least one of the outputs of the drive circuits and of the potential applied to the at least one output of the remaining drive circuits.
  • a resistance network may be provided to provide the detection potential, wherein the resistance network has a measuring node which is connected to the at least one of the outputs of the drive circuits and the at least one output of the remaining drive circuits via first resistors and which is connected to the Reference potential is connected via a second resistor.
  • a detection circuit may be configured to determine that there is an interruption of at least one of the line connections between the power stage and the electrical machine depending on a result of a threshold comparison of the detection potential with a predetermined threshold potential.
  • a drive system for driving an electric machine comprising a power stage with a plurality of drive circuits and the above device.
  • FIG. 1 shows a motor system with a three-phase motor and a control unit; 2 shows a detection circuit of the control circuit for detecting an open
  • 3 is a flowchart illustrating the method for detecting a physical interruption of a line connection between the power stage and the three-phase motor
  • Fig. 5 is a flowchart illustrating another method for detecting a physical interruption of a line connection between the power stage and the three-phase motor.
  • an engine system 1 is shown with a designed as a three-phase motor 2 electric machine.
  • the three-phase motor 2 is a three-phase three-phase motor whose coil windings 3 are connected in star connection 15. Other interconnections of the coil windings 3, e.g. in a delta connection, but are also possible.
  • the three-phase motor 2 has a separate connection for each phase U, V, W, each with a corresponding drive circuit, in particular
  • the power stage 4 serves to provide the three-phase motor 2 with electrical energy for driving.
  • the inverter circuits 5U, 5V, 5W of the power stage 4 each have a first power transistor 6U, 6V, 6W as a power switch, hereinafter referred to as a high-side transistor.
  • each of the inverter circuits 5U, 5V, 5W has a further power transistor 7U, 7V, 7W as a power switch, which is referred to below as a low-side transistor.
  • High-side and low-side transistors 6U, 7U; 6V, 7V; 6W, 7W are connected in series between a high supply voltage potential V Ba t and a ground potential GND.
  • the outputs of the individual inverter circuits 5U, 5V, 5W are connected between the two series-connected power transistors 6U, 7U, 6V, 7V, 6W, 7W, ie, the drain terminals of the power transistors are connected to the corresponding output of the respective inverters Circuit 5U, 5V, 5W connected.
  • the outputs of the individual inverter circuits 5U, 5V, 5W are connected via corresponding connecting lines 10 with an associated phase connection of the three-phase motor 2.
  • a control circuit 8 For operating the three-phase motor 2, a control circuit 8 is provided which applies a control signal to corresponding gate terminals of the power transistors 6U, 7U, 6V, 7V, 6W, 7W via corresponding connecting lines.
  • the drive signals are generally pulse-width modulated and correspondingly switch a current path through two of the phase connections of the three-phase motor 2.
  • both drain terminals and source terminals of each of the power transistors may be connected to the control circuit 8.
  • the connection of the source terminals to the control circuit 8 can be dispensed with.
  • an open-load detection circuit 9 is provided in the control unit 8 for each of the power transistors 6U, 7U, 6V, 7V, 6W, 7W.
  • Fig. 2 is a block diagram of an open-load detector circuit 9, as is preferably provided for each of the power transistors of the inverter power stage 4 in the control circuit 8 is shown.
  • the open-load detector circuit 9 is connected to the drain terminal of the associated power transistor.
  • the open-load detector circuit 9 comprises a current source 13, an amplifier circuit 11 and a comparator unit 12. If an open-load detection is to be carried out by the control circuit 8, the control circuit 8 activates the current source 13, a certain th current in the associated power transistor, which is opened by a corresponding drive signal at the gate terminal of the power transistor to impress.
  • the impressed current causes a voltage drop across the high-impedance power transistor, which usually leads to a voltage drop across the power transistor.
  • the magnitude of the impressed current through the current source 13 is selected so that it can be determined by evaluating the voltage drop across the associated power transistor, whether the drain terminal of the power transistor is electrically floating or floating, ie has no potential terminal, or with one of the supply potentials connected is.
  • the voltage is known, or the voltage range, which is established at the drain terminal of the power transistor when the drain terminal is floating. If the drain terminal is not floating, then it is connected via the connecting lines 10 and the electric machine 2 either to the positive or negative supply potential, so that the corresponding open-load voltage (product of impressed current and resistance of the power transistor in the off state or parasitic resistors) by impressing the current through the current source 13 does not set.
  • the amplifier circuit 1 1 To evaluate the voltage at the drain terminal, the amplifier circuit 1 1 is provided, whose output is connected to a comparator unit 12.
  • the amplifier circuit 11 has a very high-impedance input in order not to influence the voltage which is established in the case of a floating potential.
  • the comparator unit 12 is supplied with a reference voltage U Ref , which indicates a threshold value.
  • a threshold value comparison with the amplified open-load voltage output by the amplifier circuit 11 is carried out in order to determine, depending on the voltage applied there, whether the drain terminal of the relevant power transistor is floating or connected to a fixed potential. In order to determine whether a physical line interruption has occurred on at least one of the connecting lines 10, it is now provided to have a test method carried out by the control circuit 8.
  • the control circuit 8 closes only one of the power transistors of a specific phase (step S1), while all other power transistors remain open.
  • the closing of the corresponding power transistor causes outputting one of the supply potentials at the output of the respective inverter circuit and would have to cause in uninterrupted connection lines 10, that at all outputs of the other inverter circuits 5U, 5V, 5W, the corresponding potential is applied.
  • the potential applied to the outputs of the inverter circuits 5U, 5V, 5W corresponds to the high supply potential V B at when a high side power transistor 6U, 6V, 6W has been closed, or the low supply potential when a low supply potential.
  • Side power transistor 7U, 7V, 7W has been closed.
  • step S2 By subsequently performing the above-described open-load detection on the power transistors of the other phases using the associated open-load detector circuits 9 (step S2) can be a physical interruption of the line connection 10 of the considered phase between the inverter power stage 4 and the considered phase following the three-phase machine 2 are closed (step S3, alternative: yes), when an open-load state at the power transistors of the inverter circuits 5U, 5V, 5W or at the outputs of the inverter circuits 5U, 5V, 5W of the remaining phases is detected.
  • step S3 If this is not the case (step S3, alternative: no), and it is determined that no open-load state at the power transistors of the inverter circuits 5U, 5V, 5W or at the outputs of the inverter circuits 5U, 5V, 5W of all remaining phases is detected, there is no interruption of the line connections 10 (step S4, alternative: yes).
  • step S4 If there is an open-load state at the power transistors of only one of the inverter circuits 5U, 5V, 5W or at the outputs of only one of the inverter circuits 5U, 5V, 5W of all other phases, then there may be an interruption of that line connection 10 before (step S4, alternative: No) connected to the output of the inverter circuit 5U, 5V, 5W at which the open-load state, ie, the floating potential, has been detected.
  • the evaluation is performed with the open-load detector circuits 9, the low -Side transistors 7U, 7V, 7W of the inverter circuits 5U, 5V, 5W of the other phases are assigned and vice versa.
  • the above process is performed for each phase, i.
  • one of the power transistors 6U, 6V, 6W, 7U, 7V, 7W is closed while all others are open, and a corresponding open-load detection is performed on the power transistors of the other phases carried out.
  • the open-load detector circuit 9 can thus be designed either to perform a simple threshold comparison or a double threshold comparison in order to determine whether the voltage applied to the respective drain terminals results from a free-floating potential or from a connection to one of the supply voltage potentials.
  • the simple threshold comparison it makes sense to perform the open-load detection on one of the low-side transistors of one of the other phases when one of the high-side transistors is closed, while in the case of the double threshold comparison, the open-load detection is only necessary one of the other power transistors of one of the other phases must be performed.
  • the double threshold comparison makes it possible to distinguish the high supply potential and the low supply potential from the potential that arises when the relevant output of the inverter circuit 5U, 5V, 5W, at which the open-load detection is performed, is floating.
  • the open-load detection is performed in the described embodiments at the drain terminals of the power transistors.
  • the corresponding procedure can be used with deviating inverter Circuits are also made directly to the respective output of the inverter circuit 5U, 5V, 5W.
  • FIG. 4 shows a further motor system 21 which has an electric machine designed as a three-phase motor 22.
  • the three-phase motor 22 corresponds to a three-phase three-phase motor whose coil windings 23 are connected in star connection and can be activated via corresponding phase connections.
  • An interconnection of the coil windings 23 in a triangular circuit is conceivable.
  • the three-phase motor 22 has a separate connection for each phase U, V, W, which is connected to a corresponding drive circuit, in particular a corresponding inverter circuit 25U, 25V, 25W of a power stage 24.
  • the power stage 24 serves to provide the three-phase motor 22 with electrical energy for driving.
  • the inverter circuits 25U, 25V, 25W of the power stage 24 each have a first power transistor 26U, 26V, 26W (high-side transistors) as a power switch. Furthermore, each of the inverter circuits 25U, 25V, 25W has another power transistor (low-side transistors) 27U, 27V, 27W as a power switch.
  • One high-side transistor and one low-side transistor 26U, 27U; 26V, 27V; 26W, 27W are connected in series between a high supply potential V ba t and a ground potential GND.
  • the outputs of the individual inverter circuits 25U, 25V, 25W are connected between the two serially connected power transistors 26U, 27U; 26V, 27V; 26W, 27W, ie, the drain terminals of the power transistors are connected to the corresponding output of the respective inverter circuit 25U, 25V, 25W.
  • the outputs of the individual inverter circuits 25U, 25V, 25W are connected via corresponding connecting lines 30 to an associated phase connection of the three-phase motor 22.
  • a control circuit 28 For operating the three-phase motor 22, a control circuit 28 is provided which applies a respective drive signal to corresponding gate terminals of the power transistors 26U, 27U, 26V, 27V, 26W, 27W via corresponding connection lines.
  • the drive signals are usually pulse width modulated and correspondingly switch a current path through two of the phase terminals of the three-phase motor 22.
  • Each of the output nodes of the inverter circuits 25U, 25V, 25W is connected to a corresponding charge source via a respective switch 31U, 31V, 31W, which may be formed, for example, as a transistor.
  • the charge source is designed as a voltage source 32U, 32V, 32W, which is connected in series via a respective internal resistance 36U, 36V, 36W, in particular an internal resistance of more than 1000 ohms, which is connected in series with the voltage source.
  • the charge sources can be designed as current sources with a respective internal resistance connected in parallel thereto.
  • This arrangement serves to keep the intermediate output node at a specific potential while the high-side transistor and the low-side transistor are switched off in order to avoid a completely floating potential or to connect the output node to a charge carrier source.
  • the switch 31 U, 31 V, 31 W is driven and closed by the control unit 28 when the associated high-side and low-side transistors are opened, i. the current source is connected to the output node of the respective inverter circuit when it is switched inactive.
  • the outputs of the inverter circuits 25U, 25V, 25W are connected via a respective first resistor 33U, 33V, 33W to a common measuring node, which in turn is connected to a measuring terminal of the control unit 28. Furthermore, the measuring terminal is connected via a second resistor 34 with a reference potential, preferably the ground potential GND.
  • a detection unit 29 is provided in the control unit 28 in order to detect and evaluate the measurement potential applied to the measurement node.
  • the measurement potential can be compared in a Schwellwertvergeich with a predetermined threshold potential, so that a line break can be detected by exceeding or falling below the threshold potential.
  • FIG. 5 shows a flow chart for illustrating a method for diagnosing the line connections 30 between the inverter circuits and the three-phase motor 22.
  • step S41 it is checked whether the three-phase motor 22 is stationary and only if this is the case (alternative: Yes), a jump is made to a step S42, in which the inverter circuits 25U, 25V are inactive except for an inverter circuit that is, the high-side transistor and the low-side transistor 26U, 27U of the inactive inverter circuit 25U are opened and the corresponding switch 31U is closed to supply the current source 32U to the respective output node of the respective inverter circuit connect.
  • the active inverter circuit 25W is switched so that the output node having a fixed potential is connected to either the high supply voltage potential V Ba t or the ground potential GND. With proper connection lines 30, the ground potential of the active inverter circuit 25W also pulls the potential of the output terminal of the inverter circuits 25U, 25V to the ground potential GND due to the generally low-resistance coil windings 23, so that a ground potential likewise sets at the measurement node M. If the ground potential at the measuring node M is detected by the control unit 8 (in step S43), a fault-free operation of the engine system 21 is signaled in step S44 and the diagnostic procedure is ended.
  • step S43 If a voltage other than the predetermined potential, ie, not equal to the ground potential GND, is detected at the measuring node M, a case has occurred in which one of the output terminals of the inverter circuits 25U, 25V, which are inactive, does not have the three-phase motor 22 connected to the defined potential.
  • the result is a voltage at the corresponding output terminal which results from the current provided by the respective current source 32U, 32V and the sum of the first resistor 33U, 33V and the second resistor 34.
  • This current flow leads to a drop in a voltage across the second resistor 34, so that the measuring potential at the measuring node deviates from the ground potential (generally from the reference potential).
  • an error is detected (step S43).
  • one of the inverter circuits 25U, 25V, 25W is switched inactive in step S44, that is, the output terminal is connected to the power source through the corresponding switch 31U, 31V, 31W.
  • the remaining inverter circuits are then switched so that a fixed same potential is applied to their respective output terminals. In this way, it can be checked whether the connection line with respect to the inactive switched inverter circuit 25U is properly connected to the three-phase motor 22 or not.
  • step S45 If it is determined in step S45 that the measurement potential is equal to the specified potential, i. to the ground potential GND, it is determined that the connection line 30 connected to the inactive switched inverter circuit 25U is functioning properly (alternative: Yes). If a measuring potential is detected which deviates from the specified potential (alternative: no), an error of the connecting line 30 connected to the inactive-connected inverter circuit 25U is signaled in step S46. If no error has been detected, then step S47 returns to step S44, selecting a respective next inverter circuit 25V, 25W, until all inverter circuits 25U, 25V, 25W have been tested in this way. Since an error has previously been detected in step S43, at least one of the connection lines 30 associated with the inverter circuits 25U, 25V, 25W must be defective.
  • the measuring potential at the measuring node M is detected by an analog-to-digital converter 36 provided in the control unit 8, and it is determined by means of a threshold comparison whether the measuring potential corresponds to the set potential, i. corresponds to the reference potential or a potential deviating therefrom.
  • the diagnostic method it is further possible to actively set all inverter circuits 25U, 25V, 25W to a fixed, ie the same potential, so that the determined potential must result at the measuring node M as measuring potential. If the measuring potential deviates from this, then it is possible to conclude that there is a short circuit to another fixed potential. If, for example, all the inverter circuits 25U, 25V, 25W are switched to a ground potential, the measuring potential deviates from the ground potential. sepotential, it can be concluded that there is a short circuit to the high supply voltage potential.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Ac Motors In General (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Inverter Devices (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

L'invention porte sur un dispositif destiné à détecter une interruption d'une liaison câblée (10 ; 13) entre un étage de puissance (4 ; 24) comportant plusieurs circuits d'excitation (5U, 5V, 5W ; 25U, 25V, 25W), qui sont configurés de façon à pouvoir appliquer au choix l'un d'un ou plusieurs potentiels fixés à une sortie du circuit d'excitation correspondant (5U, 5V, 5W ; 25U, 25V, 25W), ou à séparer la sortie du circuit d'excitation correspondant (5U, 5V, 5W ; 25U, 25V, 25W) d'avec les potentiels fixés, et une machine électrique (2 ; 22), comportant plusieurs enroulements de phase, reliés les uns aux autres, qui peuvent être contactés par l'intermédiaire de raccords de phase, la sortie de chacun des circuits d'excitation (5U, 5V, 5W ; 25U, 25V, 25W) étant reliée à un raccord de phase par l'intermédiaire d'une liaison câblée correspondante (10 ; 30), avec les étapes suivantes : application (S1) d'un potentiel, fixé dans chaque cas, à au moins une sortie des circuits d'excitation (5U, 5V, 5W ; 25U, 25V, 25W) ; - mise en oevre d'une détection dans le but de détecter un potentiel de détection, qui dépend du potentiel au niveau de l'une des sorties des circuits d'excitation (5U, 5V, 5W ; 25U, 25V, 25W) ou des potentiels au niveau de plusieurs des sorties des circuits d'excitation (5U, 5V, 5W ; 25U, 25V, 25W) ; et - constatation, en fonction du résultat de la détection,  qu'il existe une interruption d'au moins l'une des liaisons câblées (10 ; 30) entre l'étage de puissance (4 ; 24) et la machine électrique (2 ; 22).
EP09783025A 2008-09-19 2009-09-15 Procédé et dispositif pour le diagnostic de défauts de liaison entre un circuit d'attaque et une machine électrique Withdrawn EP2338065A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008042222 2008-09-19
DE102009000659A DE102009000659A1 (de) 2008-09-19 2009-02-06 Verfahren und Vorrichtung zur Diagnose von Verbindungsfehlern zwischen einer Treiberschaltung und einer elektrischen Maschine
PCT/EP2009/061938 WO2010031762A1 (fr) 2008-09-19 2009-09-15 Procédé et dispositif pour le diagnostic de défauts de liaison entre un circuit d'attaque et une machine électrique

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DE102014210564A1 (de) * 2014-06-04 2015-12-17 Robert Bosch Gmbh Erkennungsvorrichtung und Verfahren zur Erkennung einer Unterbrechung in einer Versorgungsleitung zwischen der Erkennungsvorrichtung und einem elektrischen Verbraucher
EP4545986B1 (fr) * 2023-10-23 2026-03-04 D+H Mechatronic AG Procédé pour vérifier l'état de fonctionnement des lignes d'alimentation électriques d'un moteur triphasé et du moteur triphasé en mode veille
WO2026063914A1 (fr) * 2024-09-17 2026-03-26 General Electric Renovables Espana S.L. Système et procédé de détection de dégradation de câbles d'une machine électrique polyphasée

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US20080067960A1 (en) * 2004-11-24 2008-03-20 Nsk, Ltd. Unconnected Motor, Drive Control Device Thereof, And Electric Power Steering Device Using Drive Control Device Of Unconnected Motor
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DE102009000659A1 (de) 2010-03-25
CN102159958B (zh) 2014-09-10
CN102159958A (zh) 2011-08-17

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