EP1872467A1 - Dispositif comprenant un moteur a courant triphase et un convertisseur de frequence - Google Patents

Dispositif comprenant un moteur a courant triphase et un convertisseur de frequence

Info

Publication number
EP1872467A1
EP1872467A1 EP06724021A EP06724021A EP1872467A1 EP 1872467 A1 EP1872467 A1 EP 1872467A1 EP 06724021 A EP06724021 A EP 06724021A EP 06724021 A EP06724021 A EP 06724021A EP 1872467 A1 EP1872467 A1 EP 1872467A1
Authority
EP
European Patent Office
Prior art keywords
frequency converter
arrangement according
phase machine
circuit
rotor
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Withdrawn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
EP06724021A
Other languages
German (de)
English (en)
Inventor
Frank Buschbeck
Martin Groeschl
Gerwin Preisinger
Andreas Jagenbrein
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of EP1872467A1 publication Critical patent/EP1872467A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply

Definitions

  • the invention relates to an arrangement with a three-phase machine and a frequency converter.
  • the three-phase motor comprises a rotor and a stator, wherein the rotor is rotatably mounted via bearings relative to the stator. Outer rings of the bearings are electrically connected to a motor housing of the three-phase motor, wherein the motor housing is in turn connected via a Schutzerd effet with a grounding point, with which the frequency converter is connected.
  • the rotor of the three-phase motor can furthermore be connected to a shaft of a working machine driven by the three-phase motor, wherein this connection can be designed to be electrically conductive or insulated.
  • the stator of the three-phase motor comprises at least three stator windings, one end of which is interconnected to form a neutral point.
  • the other ends of the stator windings are connected to corresponding output terminals of the frequency converter via corresponding motor connection terminals.
  • the connection between the frequency converter and the three-phase motor takes place, for example, via a three-core motor connection cable.
  • at least one positive or one equal magnitude negative voltage is applied to the three output terminals of the frequency converter in relation to a ground potential at specific times.
  • a pulse-shaped voltage characteristic with steep pulse edges thus arises at the output terminals of the frequency converter.
  • One third of the sum of said voltages at the output terminals of the frequency inverter is referred to as common mode voltage.
  • Each of the three stator windings has a hardly avoidable parasitic stator-rotor stray capacitance towards the rotor.
  • This stator-rotor stray capacitance enter the sudden changes in the electrical voltages from the motor terminals to the rotor and thus also to the inner rings of the bearing whose outer rings are electrically connected to the grounded motor housing as already described.
  • the amount of stator-rotor stray capacitance is one to two powers of 10 smaller than a rotor-housing stray capacitance between the rotor and the motor housing, which although a strong attenuation of the voltage jumps to the camp out, but still stresses on the bearings Can assume values in which a lubricating film in the bearing is electrically penetrated and bearing damage occurs. Since each of the stator-rotor stray capacitances forms a capacitive voltage divider with the rotor-housing stray capacitance, the temporal voltage profile on the rotor is similar to that of the common-mode voltage.
  • the following parasitic circuit is created: Starting from a reference to the grounding power supply of the frequency converter to one of the output terminals of the frequency converter, via the motor connecting cable to the respective stator winding, via its stator-housing stray capacitance to the motor housing and then via the protective ground line back to the earthing point.
  • the current in these circuits is significantly affected by the slope of the Voltages at the output terminals of the frequency inverter determined.
  • the current pulses are needle-shaped.
  • the current flows substantially during the switching operations and possibly causes a significant voltage drop of, for example, up to 100 volts in a hardly avoidable inductance of Schutzerd Ober.
  • these voltage pulses also reach the rotor and, if the working machine is connected to the grounding point via a separate protective earth line, cause a potential difference with respect to the working machine.
  • Another danger in this case also exists for persons while simultaneously touching the motor housing and housing of the working machine.
  • An object of the invention is to provide an improved arrangement with a three-phase machine and a frequency converter, so that in particular bearings of the three-phase machine or a coupled machine are protected from damage and destruction due to current passage in a simple manner.
  • the object is solved by the subject matter of claim 1.
  • Advantageous embodiments are described in the subclaims.
  • an arrangement with a three-phase machine and a frequency converter includes the following features:
  • the three-phase machine comprises a stator and a rotor, wherein at least the three circuits of the stator and / or the rotor for the three-phase alternating current isolated and operable isolated from each other with a separate connection point of the frequency converter are connected, and
  • the frequency converter is designed with a center point grounded DC voltage or DC intermediate circuit that each circuit between the two associated connection points at any time, based on the ground potential symmetrical, electrical voltage or current can be output.
  • the invention is based on the finding that parasitic voltages coupled in opposite directions to one another on a shaft of the three-phase machine cancel each other out, so that when the stator windings of the three-phase machine are isolated from one another in connection with a concern of exclusively unbalanced voltages at the individual stator windings, the disadvantages described in the introduction be prevented with respect to bearing damage and Bermmschreiben, which is true both when using insulated against passage between rotor and stator bearings and bearings that are free of such insulation.
  • the arrangement according to the invention advantageously results in the parts of the arrangement listed below remaining permanently at ground potential Three-phase machine and its associated inner bearing rings as well as an optional coupling to the shaft of a connected to the three-phase machine further machine, such as a working machine; the machine housing and bearing outer rings connected to the machine housing and finally the Schutzerdtechnisch over its entire length between the three-phase machine and the grounding point.
  • the only prerequisite is that the stray capacitances of each of the stator windings relative to the machine housing or relative to the rotor are distributed substantially symmetrically with respect to a center point of the stator winding between their two connection points.
  • this is usually an inherent feature of many three-phase machines. Smaller deviations from this capacitive symmetry of each stator winding relative to the rotor or the machine housing or asymmetries in the unbalanced output voltages of the frequency converter only lead to the occurrence of small parasitic residual currents and reduce the effectiveness of the arrangement according to the invention only slightly.
  • Figure 1 is a circuit diagram of an arrangement with a frequency converter and a three-phase motor and
  • Figure 2 is a circuit diagram of a Polwendersc Francisco the frequency converter.
  • FIG. 1 shows as an embodiment of the invention, a circuit diagram of an arrangement with a frequency converter 100 and a three-phase motor 200.
  • the three-phase motor 200 includes a rotor 210 and a stator, the rotor 210 via at least two rolling bearings 231 and 232, which is free of an isolie - tion against electrical current passage may be formed, is rotatably mounted relative to the stator.
  • the outer rings of the roller bearings 231 and 232 may be electrically conductively connected to a motor housing 220 of the three-phase motor 200, wherein the motor housing 220 is in turn connected via a Schutzerdtechnisch 175 with a grounding point 125, to which the Frequenzumrich- ter 100 is connected.
  • the rotor 210 of the three-phase motor 200 is further coupled to a shaft of a work machine 290 driven by the three-phase motor 200.
  • the stator of the three-phase motor 200 comprises at least three stator windings, with only one of the stator windings 225 being shown for reasons of clarity. Each stator winding are both ends with corresponding Output terminals 111, 112, and 114, 115, and 117 and 118 of the frequency converter 100 connected.
  • the connection between the frequency converter 100 and the three-phase motor 200 via an at least six-core, optionally unshielded trained motor connection cable 170, which includes a further wire for the protective ground line 175 in the embodiment shown.
  • the three-phase motor 200 is designed such that between the stator winding 225 and the rotor 210, a stator-rotor stray capacitance 241 and 242 between the two connection points of the stator winding 225 is distributed substantially symmetrically with respect to the center point.
  • a stator-housing stray capacitance 251 and 252 between the stator winding 225 and the motor housing 220 is present in many three-phase motors as an inherent property.
  • the frequency converter 100 for the stator winding 225 comprises, for example, a so-called pole-changing circuit, which will be explained in more detail with reference to FIG.
  • a positive DC voltage of predeterminable magnitude at an input terminal 121 in the frequency converter 100, a positive DC voltage of predeterminable magnitude and at an input terminal 122 to provide a magnitude equal negative DC voltage.
  • the input terminal 123 is connected to the grounding point 125 as the midpoint on the DC voltage side of the frequency converter 100 for the unbalanced ground voltages.
  • the electrical potential of the rotor 210 therefore corresponds permanently to the central potential of the drive pulses, which is identical to the ground potential as required. Due to the large conductive surface of the rotor 210 and the resulting low electrical impedance of the entire rotor 210 and the motor shaft is at spatially constant potential.
  • the stator-housing stray capacitance 251 and 252 which may also be thought of as two capacitances 251 and 252 of the same size, the one previously described for the stator-rotor stray capacitance 241 and 242 applies mutatis mutandis, so that the motor housing 220 permanently on Earth potential lies. This means now that via the rolling bearings 231 and 232, no electrical voltage occurs. Bearing damage and bearing destruction due to current passage due to capacitive coupled to the rotor voltages are thus prevented.
  • the protective ground line 175 of the three-phase motor 200 advantageously also leads to no current, so that no voltage drops across its inductance 176 either.
  • An unbalanced voltage between the output terminals 111 and 112 as well as 114 and 115 as well as 117 and 118 of the frequency converter can be generated with the known, as shown in Figure 2 so-called Polwenderscnies become.
  • a DC voltage supply to the Polwenderscnies takes place symmetrically to the ground potential via the two input terminals 121 (positive voltage) and 122 (negative voltage).
  • the stator winding 225 is connected between the two output terminals 111 and 112 of the frequency converter 100.
  • the semiconductor switches 141 and 144 are to be closed, while the other semiconductor switches 142 and 143 must be open.
  • the semiconductor switches 142 and 143 are closed and for the semiconductor switches 141 and 144 are opened.
  • the semiconductor switches 141, 142, 143 and 144 are designed, for example, as transistors, IGBTs or GTOs.
  • the diodes 152 of the Polwenderscnies serve in a conventional manner to protect the semiconductor switches 141, 142, 143 and 144 against overvoltages in the moment of their opening.
  • the resistors 154 of the Polwenderscnies thereby cause the reduction of residual charges in the motor connection cable 170 and in the stray capacitances 241, 242, 251 and 252 during a switching state in which all semiconductor switches 141, 142, 143 and 144 are open.
  • For generating corresponding voltage between the output terminals 114 and 115 as well as between 117 and 118, corresponding pole changing circuits as previously described are provided in the frequency converter 100.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention concerne un dispositif comprenant un moteur à courant triphasé et un convertisseur de fréquence. Cette invention est caractérisée en ce que le moteur à courant triphasé comprend un stator et un rotor. Au moins les trois circuits du stator et/ou du rotor peuvent être exploités de façon isolée les uns des autres pour les trois phases de courant triphasé et peuvent respectivement être reliés à un point de connexion différent du convertisseur de fréquence de façon isolée les uns des autres. Le convertisseur de fréquence est conçu avec un circuit intermédiaire à tension continue ou à courant continu mis à la terre de façon centrale de manière que pour chaque circuit entre les deux points de connexion correspondants, une tension ou un courant électrique symétrique par rapport au potentiel à la terre peut être fourni à chaque instant.
EP06724021A 2005-04-13 2006-04-05 Dispositif comprenant un moteur a courant triphase et un convertisseur de frequence Withdrawn EP1872467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005016962A DE102005016962A1 (de) 2005-04-13 2005-04-13 Anordnung mit einer Drehstrommaschine und einem Frequenzumrichter
PCT/EP2006/003066 WO2006108535A1 (fr) 2005-04-13 2006-04-05 Dispositif comprenant un moteur a courant triphase et un convertisseur de frequence

Publications (1)

Publication Number Publication Date
EP1872467A1 true EP1872467A1 (fr) 2008-01-02

Family

ID=36699143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06724021A Withdrawn EP1872467A1 (fr) 2005-04-13 2006-04-05 Dispositif comprenant un moteur a courant triphase et un convertisseur de frequence

Country Status (8)

Country Link
US (1) US7948206B2 (fr)
EP (1) EP1872467A1 (fr)
JP (1) JP5103375B2 (fr)
CN (1) CN101160706B (fr)
BR (1) BRPI0608660A2 (fr)
CA (1) CA2604298C (fr)
DE (1) DE102005016962A1 (fr)
WO (1) WO2006108535A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2734699C (fr) * 2008-08-22 2014-03-25 Toshiba Mitsubishi-Electric Industrial Systems Corporation Appareil de conversion de puissance
US9472990B2 (en) 2010-10-19 2016-10-18 Baker Hughes Incorporated Systems and methods for insulating Y-points of three phase electric motors
EP2602925A1 (fr) 2011-12-07 2013-06-12 KD Elektroniksysteme GmbH Convertisseur de fréquence doté d'une séparation de potentiel dans le circuit intermédiaire à tension continue pour le réglage d'un moteur asynchrone
KR101422508B1 (ko) * 2012-09-13 2014-07-24 삼성중공업 주식회사 갑판기계를 포함하는 선박

Family Cites Families (15)

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US3699335A (en) * 1971-01-06 1972-10-17 Rca Corp Apparatus for charging a recording element with an electrostatic charge of a desired amplitude
US5852558A (en) * 1997-06-20 1998-12-22 Wisconsin Alumni Research Foundation Method and apparatus for reducing common mode voltage in multi-phase power converters
JP3292179B2 (ja) 1999-09-07 2002-06-17 トヨタ自動車株式会社 モータ駆動装置のための異常検出装置
US6636107B2 (en) * 2000-03-28 2003-10-21 International Rectifier Corporation Active filter for reduction of common mode current
EP1168565A1 (fr) * 2000-06-30 2002-01-02 ABB Industrie AG Protection d'un circuit de rétablissement dynamique tension
SE521367C2 (sv) * 2001-04-11 2003-10-28 Abb Ab VSC-strömriktare
DE10149270A1 (de) * 2001-10-02 2003-04-24 Wilfried Hofmann Raumzeigerbasiertes Schaltmuster zur Minimierung der Sternpunktspannungsschwankungen bei einer an einem Gleichspannungszwischenkrreisumrichter betriebenen Drehstrommaschine
US7050279B2 (en) * 2002-04-05 2006-05-23 Smc Electrical Products, Inc. Method and apparatus for high impedance grounding of medium voltage AC drives
WO2004045054A1 (fr) * 2002-11-11 2004-05-27 The Circle For The Promotion Of Science And Engineering Dispositif de filtrage
DE20301956U1 (de) * 2003-02-07 2004-06-17 Ab Skf Vorrichtung zum Schutz eines Lagers einer Elektromaschine vor einem schädigenden Stromdurchgang
DE10310577A1 (de) * 2003-03-11 2004-09-30 Siemens Ag Nullspannungsfilter für Umrichter mit selbstgeführtem Netzstromrichter (AFE) und Gleichspannungszwischenkreis
DE102006007437B4 (de) * 2006-02-17 2013-11-07 Siemens Aktiengesellschaft Elektrische Maschine mit einer Vorrichtung zur Vermeidung von schädlichen Lagerströmen und entsprechendes Verfahren
CN101400890B (zh) * 2006-03-17 2013-01-02 维斯塔斯风力系统有限公司 用于发电机的保护系统、风轮机及其使用
US7687928B2 (en) * 2006-06-14 2010-03-30 Smiths Aerospace, Llc Dual-structured aircraft engine starter/generator
US7957166B2 (en) * 2007-10-30 2011-06-07 Johnson Controls Technology Company Variable speed drive

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Also Published As

Publication number Publication date
JP2008536463A (ja) 2008-09-04
CA2604298C (fr) 2014-02-18
CN101160706A (zh) 2008-04-09
CN101160706B (zh) 2013-03-27
BRPI0608660A2 (pt) 2010-11-30
JP5103375B2 (ja) 2012-12-19
WO2006108535A1 (fr) 2006-10-19
US20090039816A1 (en) 2009-02-12
CA2604298A1 (fr) 2006-10-19
US7948206B2 (en) 2011-05-24
DE102005016962A1 (de) 2006-11-02

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