DE2420166A1 - Electrical machine angular displacement sensor - has two probes using Hall generators or inductive coils with differential amplifiers and pulse former - Google Patents

Electrical machine angular displacement sensor - has two probes using Hall generators or inductive coils with differential amplifiers and pulse former

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Publication number
DE2420166A1
DE2420166A1 DE2420166A DE2420166A DE2420166A1 DE 2420166 A1 DE2420166 A1 DE 2420166A1 DE 2420166 A DE2420166 A DE 2420166A DE 2420166 A DE2420166 A DE 2420166A DE 2420166 A1 DE2420166 A1 DE 2420166A1
Authority
DE
Germany
Prior art keywords
probes
angle encoder
encoder according
electrical machine
magnetic field
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Withdrawn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
DE2420166A
Other languages
German (de)
Inventor
Martin Richter
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE2420166A priority Critical patent/DE2420166A1/en
Priority to JP4955675A priority patent/JPS50146822A/ja
Publication of DE2420166A1 publication Critical patent/DE2420166A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

The detection equipment detects angular movements in an electrical machine. It comprises two probes whose arcual displacement (a) is larger than the active slot width of the rotor (ln) but smaller than the distance between two adjacent slots (lt). The probes may be Hall generator elements or inductive pick-up coils. Voltage pick-up signals pass through individual amplifiers to maximum value computer and a differential amplifier. The final stage is a threshold detection unit which acts as a pulse former to form an output pulse of digital form (I) from the amplified differential signal (d).

Description

Winkelachrittgeber für eine elektrische Maschine Zum Betrieb und zur Regelung von Stromrichtermotoren werden Polradlagegeber und Winkelschrittgeber benötigt, die eine winkelgerechte Bestimmung der augenblicklichen Lage des Läufers zu den Ständerwicklungen ermöglichen. Bekannte Winkelschrittgeber bestehen aus einer Impulsscheibe mit einer großen Anzahl gleichmäßig über den Umfang verteilter Einzelmagnete und einem Hallgenerator. Die bekannten Winkelschrittgeber werden entweder als eigengelagerte Meßgeber an ein freies Wellenende der Maschine angeflanscht oder es ist eine im Inneren der Maschine auf der Maschinenwelle angeordnete Impulsscheibe vorgesehen.Angle step encoder for an electrical machine For operation and for For the control of converter motors, pole wheel position encoders and angular incremental encoders are required, an angular determination of the current position of the runner to the Enable stator windings. Known angular encoders consist of a pulse disc with a large number of individual magnets evenly distributed over the circumference and a hall generator. The well-known angular incremental encoders are either self-stored Encoder flanged to a free shaft end of the machine or it is an im Inside the machine on the machine shaft arranged pulse disc is provided.

Beide Möglichkeiten sind nachteilig, da sie aufwendige konstruktive Änderungen an der Maschine erfordern.Both options are disadvantageous because they are expensive and constructive Require changes to the machine.

Der Erfindung liegt die Aufgabe zugrunde, einen einfach aufgebauten Winkelschrittgeber für elektrische Maschinen zu schaffen. Ein erfindungsgemäßer inkelschrittgeber weist die Kombination der folgenden Merkmale auf: a) Zwei magnetfeldempfmndliche Sonden sind arbeitsluftspaltseitig am Ständer angeordnet, deren Abstand größer als eine aktive Läufernutbreite und kleiner als die Läufernutteilung ist, b) eine Maxirnalwert-Auswahlstufe bildet aus den Meßspannungen der beiden Sonden eine geglättete Meßspannung, c) ein Vergleicher erzeugt Differenzimpulse aus der geglätteten Meßspannung und der Meßspannung einer der beiden Sonden.The invention is based on the object of a simply constructed To create angular encoders for electrical machines. An inventive Angle pacer has a combination of the following features: a) Two magnetic field sensitive Probes are arranged on the working air gap side on the stand, the distance between them being greater than is an active rotor slot width and smaller than the rotor slot pitch, b) a maximum value selection level forms a smoothed measuring voltage from the measuring voltages of the two probes, c) Comparator generates differential pulses from the smoothed measurement voltage and the measurement voltage one of the two probes.

Die Erfindung nutzt die Erscheinung aus, daß bei einer punktförmigen oder nahezu punktförmigen Meßsonde zur Erfassung des Luftspaltflusses einer elektrischen Maschine keine Meßspannung mit stetigem Verlauf entsteht, sondern daß die Meßspannung mit Oberschwingungen überlagert ist, die ihre Ursache in der unterschiedlichen magnetischen Leitfähigkeit der Läuferzähne und der Läufernuten haben. Die erzeugte Meßspannung erfährt immer dann einen Einbruch, wenn sich eine Läufernut unterhalb der Meßsonde befindet. Sieht man jedoch gemäß dem erfindungsgemgtßen Vorschlag zwei punktförmige oder nahezu punktförmige Sonden im angegebenen Abstand vor, so ist sichergestellt, daß Jeweils eine der beiden Sonden den vollen Luftspaltfluß im Bereich eines Läuferzahnes erfaßt. Mit Hilfe einer Maximalwert-Auswahlstufe wird aus den Meßspannungen der beiden Sonden eine geglättete Meßspannung gebildet, weil die Maximalwert-Auswahlstufe bei einem Spannungseinbruch bei der einen Sonde sofort die Spannung der anderen Sonde auf ihren Ausgang durchschaltet. Ein Vergleich der geglätteten Meßspannung mit einer der beiden Meßspannungen führt zu Impulsen, die den Spannungs einbrüchen der betreffenden Xeßspannung bei den Läufernuten entsprechen. Da die Läufernuten gleichmäßig über den Umfang des Läufers verteilt sind, können die Spannungseinbrüche als drehwinkelproportionales Signal angesehen werden. Die Differenzimpulse, die die Spannungseinbrüche abbilden, können mit Hilfe eines Grenzwertmelders als Impulsformerstufe in geeignete Logiksignale umgeformt werden.The invention takes advantage of the phenomenon that in a punctiform or almost point-shaped measuring probe for detecting the air gap flow of an electrical one Machine no measuring voltage with a steady course arises, but that the measuring voltage is superimposed with harmonics, which are their cause in the different magnetic Have conductivity of the rotor teeth and the rotor slots. The generated measurement voltage always experiences a break-in when there is a runner groove below the measuring probe is located. However, if one sees according to the proposal according to the invention two punctiform or almost point-shaped probes in front of the specified distance, this ensures that that in each case one of the two probes has the full air gap flow in the area of a rotor tooth recorded. With the help of a maximum value selection stage, the measured voltages become the a smoothed measurement voltage is formed on both probes because the maximum value selection stage in the event of a voltage drop in one probe, the voltage in the other immediately applies Probe switches through to its output. A comparison of the smoothed measurement voltage with one of the two measuring voltages leads to pulses that collapse the voltage correspond to the relevant Xeßspannung at the rotor slots. As the runner grooves are evenly distributed over the circumference of the rotor, the voltage drops can can be viewed as a signal proportional to the angle of rotation. The difference pulses that the voltage dips can be mapped with the help of a limit indicator as a pulse shaper stage converted into suitable logic signals.

Falls die gewünschte Impulszahl pro Läufernmdrehunggrößer ist als die Anzahl der Läufernuten, so kann nach einer Ausgestaltung der Erfindung eine mehrfache Anordnung von Sondenpaaren innerhalb einer Läufernutteilung vorgesehen sein. Hierdurch wird die Pulszahl pro Läuferumdrehung vervielfacht.If the desired number of pulses per rotor revolution is greater than the number of rotor grooves, according to one embodiment of the invention, one can multiple arrangement of probe pairs provided within a rotor groove division be. This multiplies the number of pulses per rotor revolution.

Als magnetfeldempfindliche Sonden können Hallgeneratoren, Peldplatten oder induktive Geber verwendet werden.Hall generators, field plates or inductive encoders can be used.

Ein Ausführungebeispiel der Erfindung und ihre in den Unteransprüchen näher gekennzeichneten Ausgestaltungen sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben.An embodiment of the invention and its in the subclaims Refinements identified in more detail are and will be shown in the drawing described in more detail below.

Es zeigen: Fig. 1 einen schematischen Querschnitt durch eine elektrische Maschine mit einem erfindungsgemäßen Winkelschrittgeber, Fig. 2 den zeitlichen Verlauf der Meßspannung einer magnetfeldempfindlichen Sonde, Fig. 3 den zeitlichen Verlauf der geglätteten Meßspannung, Fig. 4 den zeitlichen Verlauf der Differenzimpulse.They show: FIG. 1 a schematic cross section through an electrical Machine with an angular incremental encoder according to the invention, FIG. 2 shows the course over time the measuring voltage of a probe sensitive to magnetic fields, FIG. 3 shows the course over time the smoothed measurement voltage, FIG. 4 shows the time course of the difference pulses.

Fig. 1 zeigt einen Schnitt durch eine elektrische Maschine mit einem Läufer 3, einem Ständer 4 und einem Arbeitsluftspalt 5.Fig. 1 shows a section through an electrical machine with a Rotor 3, a stator 4 and a working air gap 5.

Die aktive Läufernutbreite ist mit ln und die Läufernutteilung mit lt bezeichnet. Am Ständer .4 sind arbeitsluftspaltseitig zwei Hallgeneratoren 1 und 2 als magnetfSldempfindliche Sonden im Abstand a angeordnet. Der Abstand a ist größer als die aktive Läufernutbreite 1n und kleiner als die Läufernutteilung lt gewählt. Die Hallepannungen uHl und uH2 der beiden Hallgeneratoren 1 und 2 sind Signalverstärkern 6 und 7 zugeführt.The active carriage groove width is with ln and the carriage groove pitch with referred to as. On the stator .4 there are two Hall generators 1 on the working air gap side and 2 arranged as magnetic field sensitive probes at a distance a. The distance a is larger than the active runner slot width 1n and smaller than the runner slot pitch according to chosen. The Hall voltages uHl and uH2 of the two Hall generators 1 and 2 are Signal amplifiers 6 and 7 are supplied.

Die Signalverstärker 6 und 7 haben die Aufgabe, die beiden Hallepannungen auf gleiches Signalniveau abzugleichen. Die abgeglichenen Hallspannungen uH1 und uH2 (Fig. 2) sind einer Maximalwertstufe 8 eingangseitig zugefvhrt, die eine geglättete Meßspannung Ug (Fig. 3) bildet. Ein Vergleicher 9 beispielsweise ein Differenzverstärker - erzeugt Differenzimpulse d (Fig. 4) aus der Differens der geglEtteten MeB-spannung ug und der abgeglichenen Hallspannung uE2 der Hallsonde 2. Die Differenzimpulse d werden von einem Grenzwertmelder 10 als Impulsformerstufe in eine Impulsfolge I mit normierten Logiksignalen umgesetzt.The signal amplifiers 6 and 7 have the task of the two Hall voltages to adjust to the same signal level. The adjusted Hall voltages uH1 and uH2 (Fig. 2) are fed to a maximum value stage 8 on the input side, which is a smoothed Measurement voltage Ug (Fig. 3) forms. A comparator 9, for example a differential amplifier - generates difference pulses d (Fig. 4) from the difference of the smoothed measurement voltage ug and the adjusted Hall voltage uE2 of Hall probe 2. The difference pulses d are from a limit indicator 10 as a pulse shaper stage in a pulse train I with standardized Logic signals implemented.

Die Wirkungsweise eines erfindungsgemäßen Winkelschrittgebers wird anhand der Signaldarstellungen der Figuren 2 - 4 deutlich.The mode of operation of an angular incremental encoder according to the invention is clearly based on the signal representations of FIGS. 2-4.

Die in Fig. 2 dargestellte Hallspannung hat keinen stetigen Verlauf, sondern weist scharfe Spannungseinbrüche auf. Bei sich drehendem Läufer 3 bewegen sich nacheinander die Läuferzähne und Läufernuten an einem Hallgenerator vorbei. Im Bereich der Läufernuten entstehen starke Einbrüche des magnetischen Luftspaltflusses und damit der betreffenden Hallspannung. Diese Einbrüche werden zur Signalgabe ausgenutzt.The Hall voltage shown in Fig. 2 does not have a steady course, but shows sharp voltage drops. Move while the rotor 3 is rotating one after the other, the rotor teeth and rotor grooves pass a Hall generator. In the area of the rotor slots there are strong breaks in the magnetic air gap flux and thus the Hall voltage concerned. These break-ins are used for signaling.

Die geglättete Meßspamlung ug entsteht aus den beiden Hallspannungen in der Weise, daß die Maximalwert-Auswahlstufe 8 die Jeweils höhere Hallspannung auf ihren Ausgang durchschaltet.The smoothed Messspamlung ug arises from the two Hall voltages in such a way that the maximum value selection stage 8 the higher Hall voltage switches through to their output.

Durch Vergleich der geglätteten Meßspannung mit einer deren Hallspannungen entstehen lifferenzimpulse d, die den Einbrüchen des Luftspaltflusses bei den Läufernuten entsprechen.By comparing the smoothed measurement voltage with one of its Hall voltages difference impulses d arise, which cause the collapse of the air gap flow in the rotor slots correspond.

Die Differenzimpulse d stellen drehwi nkelproportionale Signale dar.The difference pulses d represent signals proportional to the angle of rotation.

6 Patentansprüche 4 Figuren6 claims 4 figures

Claims (6)

Patentansprüche 1. Winkelschrittgeber für eine elektrische Maschine, gekennzeichnet durch die Kombination der folgenden Merkmale: a) Zwei magnetfeldempfindliche Sonden (1, 2) sind arbeitsluftspaltseitig am Ständer (4) angeordnet, deren Abstand (a) größer als eine aktive Läufernutbreite (ln) und kleiner als die Läufernutteilung (lt) ist, b) eine Maximalwert-Auswahlstufe (8) bildet aus den Meßspannungen der beiden Sonden (1, 2) eine geglättete Meßspannung (ug), d) ein Vergleicher (9) erzeugt Differenzimpulse (d) aus der geglätteten Meßspannung (u ) und der Meßspannung einer g der beiden Bonden. Claims 1. Angle encoder for an electrical machine, characterized by the combination of the following features: a) Two magnetic field sensitive Probes (1, 2) are arranged on the working air gap side on the stand (4), the distance between them (a) greater than an active runner slot width (ln) and smaller than the runner slot pitch (lt) is, b) a maximum value selection stage (8) forms from the measurement voltages both probes (1, 2) a smoothed measurement voltage (ug), d) a comparator (9) generates Difference pulses (d) from the smoothed measurement voltage (u) and the measurement voltage of a g of the two bonds. 2. Winkelschrittgeber nach Anspruch 1, dadurch gekennzeichnet, daß dem Vergleicher (9) ein Grenzwertmelder (10) als Impulsformerstufe nachgeschaltet ist 2. Angle encoder according to claim 1, characterized in that the comparator (9) is followed by a limit value indicator (10) as a pulse shaper stage is 3. Winkelschrittgeber nach Anspruch 1, gekennzeichnet durch eine mehrfache Anordnung von Sondenpaaren innerhalb einer Läufernutteilung.3. Angle encoder according to claim 1, characterized by a multiple arrangement of probe pairs within a rotor slot division. 4. Winkelschrittgeber nach einem der Ansprüche 1 - 3, gekennzeichnet durch Hallgeneratoren als magnetfel dempfindtich Sonden 4. Angle encoder according to one of claims 1-3, characterized by means of Hall generators as magnetic field sensitivity probes 5. Winkelschrittgeber nach einem der Ansprüche 1 - 3, gekennzeichnet durch Feldplatten als magnetfeldempfindliche Sonden 5. Angle encoder according to one of claims 1 - 3, characterized by field plates as magnetic field sensitive Probes 6. Winkelschrittgeber nach einem der Ansprüche 1 - 3, gekennzeichnet durch induktive Geber als magnetfeldem£)findliche Soflderl.6. Angle encoder according to one of claims 1-3, characterized by Inductive encoders as magnetic field sensitive software. L e e r s e i t eL e r s e i t e
DE2420166A 1974-04-25 1974-04-25 Electrical machine angular displacement sensor - has two probes using Hall generators or inductive coils with differential amplifiers and pulse former Withdrawn DE2420166A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2420166A DE2420166A1 (en) 1974-04-25 1974-04-25 Electrical machine angular displacement sensor - has two probes using Hall generators or inductive coils with differential amplifiers and pulse former
JP4955675A JPS50146822A (en) 1974-04-25 1975-04-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2420166A DE2420166A1 (en) 1974-04-25 1974-04-25 Electrical machine angular displacement sensor - has two probes using Hall generators or inductive coils with differential amplifiers and pulse former

Publications (1)

Publication Number Publication Date
DE2420166A1 true DE2420166A1 (en) 1975-11-13

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DE (1) DE2420166A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577680A1 (en) * 1985-02-15 1986-08-22 Europ Propulsion DEVICE FOR MEASURING THE INDUCTION IN THE MAGNETIC BEARING OF A MAGNETIC BEARING
US4752732A (en) * 1985-03-14 1988-06-21 Baker-Hughes Angular displacement sensor
EP0377854A1 (en) * 1988-12-15 1990-07-18 Arbeitsgemeinschaft Prof. Dr. J. Hugel Test and measurement stand for an electromechanical converter
US5304926A (en) * 1992-04-08 1994-04-19 Honeywell Inc. Geartooth position sensor with two hall effect elements
EP2878813A1 (en) * 2013-11-26 2015-06-03 General Electric Company Method for inspecting wye ring
US9178757B2 (en) 2013-12-31 2015-11-03 General Electric Company Serial link fault detection system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6092167U (en) * 1983-11-29 1985-06-24 オリンパス光学工業株式会社 Sample holding device for ultrasonic microscope

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577680A1 (en) * 1985-02-15 1986-08-22 Europ Propulsion DEVICE FOR MEASURING THE INDUCTION IN THE MAGNETIC BEARING OF A MAGNETIC BEARING
EP0192563A1 (en) * 1985-02-15 1986-08-27 SOCIETE EUROPEENNE DE PROPULSION (S.E.P.) Société Anonyme dite: Device for induction measuring in the air gap of a magnetic bearing
US4774424A (en) * 1985-02-15 1988-09-27 Societe Europeenne De Propulsion Device for measuring the induction in the air gap of a magnetic bearing
US4752732A (en) * 1985-03-14 1988-06-21 Baker-Hughes Angular displacement sensor
EP0377854A1 (en) * 1988-12-15 1990-07-18 Arbeitsgemeinschaft Prof. Dr. J. Hugel Test and measurement stand for an electromechanical converter
US5304926A (en) * 1992-04-08 1994-04-19 Honeywell Inc. Geartooth position sensor with two hall effect elements
EP2878813A1 (en) * 2013-11-26 2015-06-03 General Electric Company Method for inspecting wye ring
US9411017B2 (en) 2013-11-26 2016-08-09 General Electric Company Method for inspecting wye ring
US9178757B2 (en) 2013-12-31 2015-11-03 General Electric Company Serial link fault detection system and method

Also Published As

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