WO2007073854A1 - Dispositif pour obtenir des informations au moyen de la position du rotor de machines electriques - Google Patents

Dispositif pour obtenir des informations au moyen de la position du rotor de machines electriques Download PDF

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Publication number
WO2007073854A1
WO2007073854A1 PCT/EP2006/011880 EP2006011880W WO2007073854A1 WO 2007073854 A1 WO2007073854 A1 WO 2007073854A1 EP 2006011880 W EP2006011880 W EP 2006011880W WO 2007073854 A1 WO2007073854 A1 WO 2007073854A1
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WO
WIPO (PCT)
Prior art keywords
current
phase
electric machine
inductance
strands
Prior art date
Application number
PCT/EP2006/011880
Other languages
German (de)
English (en)
Inventor
Rolf Strothmann
Original Assignee
Rolf Strothmann
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 Rolf Strothmann filed Critical Rolf Strothmann
Priority to EP06829472A priority Critical patent/EP1961108A1/fr
Publication of WO2007073854A1 publication Critical patent/WO2007073854A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage

Definitions

  • the invention relates to a device for obtaining information that can be used for controlling the flow of electrical machines about the state of the machines.
  • EP 1 005 716 B1 discloses a device for determining the rotor rotational position during engine operation by applying pulses to phase strands of, in particular, multi-pole electrical machines and by evaluating the neutral point potential.
  • the possibility of being able to determine the rotor position in such a way is based on the fact that the inductance of the phase strands within the half magnetic period is an unambiguous function of the rotational angle ⁇ of the rotor, as described in EP 1 005 716 Bl incorporated herein.
  • Measuring voltage pulses can therefore generate a potential signal in the star point, which depends on the respective inductance of the phase strand and therefore is a measure of the position of the rotor within half the magnetic period.
  • the invention has for its object to provide a new device of the type mentioned, which extends the possibilities for controlling the energization of electrical machines and in particular can complement the above-mentioned device for determining the rotor rotational position advantageous.
  • the device for solving this object according to the invention is characterized by a device which evaluates a measurement signal for obtaining the state information, which is influenced by changing the inductance of Polwicklungsphasen- strands of the electric machine due to current flow through the phase strands.
  • the measurement signal may be, for example, a voltage dependent on the phase-strand inductances, a current change or a phase angle.
  • the changes in the inductance of pole winding phase strands considered here are based on a weakening or strengthening of the magnetic field passing through the pole windings. For large, flowing through the electrical machine operating currents, the field strength change in the pole windings and thus their inductance change can be significant. Consequently, changes in inductance can provide information about the current status of the electrical machine.
  • the state information relates to the orientation of a selected phase strand to the north or south pole or, in multi-pole machines, the north poles or south poles of the magnetic field.
  • current supplies either lead to an increase or decrease in the inductance of the relevant phase string, so that it is possible to conclude by evaluating a signal dependent on the changed inductance on the rotational position in front of a north or south pole.
  • the current which changes the inductance may be a current flowing in the context of the operating current of the electrical machine and / or a current generated separately by said device.
  • the device for generating the current is preferably provided in such a way that the generated current does not influence the torque of the electrical machine, ie forms a reactive current.
  • the current may be a component of a resulting current vector including a phase angle of 90 ° with a torque producing component of that current vector, based on the magnetic period.
  • the former component thus does not contribute to the torque of the electric machine.
  • the measurement signal may be influenced by a change in the ratio of the inductance of the phase strands. Such an influence is present in particular when, according to a preferred embodiment of the invention, the measuring signal is the potential at the star point in the star-connected phase strands of the electrical machine. In the star point, there is always a division of the voltage across the phase strands, wherein in three-phase machines for the division of the inductive resistance of a strand and the parallel connection of the inductive resistors of the other two strands is authoritative.
  • the device further comprises a device which applies voltage pulses to at least one of the Polwindlungsphasenstrlinde and evaluated to determine the rotational position of the rotor within half a magnetic period by the voltage pulses generated at the star point of the star-connected phase strands potential.
  • Fig. 1 is a schematic representation of an electrical machine with a
  • FIG. 2 shows a diagram explaining the application of measuring voltage pulses to the phase strings of the electrical machine of FIG. 1
  • FIG. 3 shows a representation explaining the rotational position of the rotor
  • FIG. 4 shows the relationship between the pole windings passing through Magnetic field H of the electric machine and the induction B in the PoI windings and the inductance L of the pole windings.
  • Fig. 1 shows phase strands 1 to 3 of the pole winding circuit of a not shown otherwise 3-phase electric machine.
  • the machine has a plurality of magnetic periods formed by permanent magnets on the rotor, which correspond to a rotational angle ⁇ , which is substantially smaller than 360 ° and is for example 12 °.
  • the phase strands 1 to 3, which are connected to one another in a star point 4, are each connected at their end remote from the star point to a voltage supply circuit 5 through which the electric machine is operated according to the pulse width modulation method.
  • the star point 4 is connected to a potential or the voltage U at the star point 4 detecting means 6, which in turn communicates with a control device 7, which u.a. controls the power supply of the electric machine by the circuit 5.
  • the means 6 for detecting the neutral point potential is connected on the output side to a device 8 which, controlled by the device 7, forms differences M between voltage values U, which the voltage detection device 6 supplies as output values.
  • Voltage difference values determined by the difference-forming device 8 can be supplied to a comparison and classification device 9 which determines from the voltage difference values M a rotational angle interval (i) decisive for the rotational position of the rotor of the electric machine within a half magnetic period ⁇ / 2.
  • a calculation device 10 connected to the devices 8 and 9 determines the exact rotational position of the rotor within the interval (i) of half the magnetic period.
  • .DELTA.t applied by the circuit 5 from the operating voltage pulses 1 1 to 13 separate Meßwoods- pulses 14 to 16 are mutually offset in time.
  • the time interval .DELTA.t is so small that the rotational position of the rotor practically does not change within this interval.
  • the measuring voltage pulses 14 to 16 generate correspondingly time-offset voltage signals U 1, U 2 and U 3 at the neutral point 4, which detects the device 6 activated simultaneously with the generation of the measuring voltage pulses 14 to 16 by the control device 7.
  • U 1, U 2 and U 3 According to a (explained below) dependency of the inductance of the pole windings of the phase strands 1 to 3 of the rotation angle ⁇ within a half magnetic period .DELTA. ⁇ / 2 results depending on the rotation angle ⁇ within the half magnetic period for the voltage signals Ul, U2 and U3 each have a periodic , approximately sinusoidal course, wherein the three voltage signals are mutually phase-shifted by 120 °.
  • the approximately sinusoidal periodic curves M1 ( ⁇ ), M2 ( ⁇ ) and M3 ( ⁇ ) shown in FIG. 3 are also phase-shifted by 120 ° relative to one another. One full period of these curves corresponds to half a magnetic period each.
  • the comparison and classification device 9 can determine the rotation angle interval (i) in which the rotor is currently located.
  • the exact calculation of the rotational position within the intervals (i) by the device 10 is based on aresin or / and arctan functions, which are preferably applied to differences in the potential profiles.
  • the phase change and thus the continuation of the intervals can be determined by monitoring switching states that occur in the normal Nutzbestromung or can be generated by slight modification (time-delayed switching on and off).
  • the angle of rotation ⁇ of the rotor can be determined by counting the number of half magnetic periods passed through.
  • FIG. 4a shows the relationship shown in FIG. 4a between the magnetic field H of the rotor passing through the pole windings of the phase strands and the induction field B resulting in the iron-containing pole windings.
  • the B-field generated by the H-field of the permanent magnets of the rotor changes in the pole windings of the phase strands.
  • the slope dB / dH which is proportional to the inductance of the phase strands, also changes.
  • FIG. 4b shows the inductance L. as a function of the H-field.
  • the pulse voltage U B applied to one of the phase strands 1 to 3 is divided, whereby, depending on the rotational position of the rotor, different division ratios and thus different potentials result at the position.
  • Decisive for the division ratio are the inductive resistance of each acted upon by the voltage UB phase strand and the inductive resistance of the parallel connection of the other two phase strands. Due to the symmetry of the curve L (H) with respect to the L-axis, however, it can not be distinguished whether half the magnetic period, within which the
  • Rot Arthurlage was determined, is formed by a north pole or a south pole.
  • the electric machine is energized by pulse width modulation such that the voltage resulting from the phase current flows, field vector H or B * generated by the totality of the pole windings, a first, exactly to the middle, between two poles of the rotor field directed component and a second, directed to one pole of the rotor field component is formed.
  • the two components thus include a phase angle of 90 °.
  • the additional reactive current causes a change of the H-field and thus also of the B-field in the pole windings of the phase strands.
  • the second current component may be e.g. be generated so that the pole winding passing through H-FeId is weakened and the inductance L of these pole windings increases accordingly, if this assumption applies.
  • the "operating point” then moves to the left in the positive part of the curve L (H) in Fig. 4b. If the assumption was wrong and the pole windings are actually in front of a south pole, this leads to an increase in the amount of the field passing through the pole windings.
  • the "working point” then moves to the left in the negative part of the curve L (H).
  • the inductance L decreases.
  • the decrease or increase of the inductance causes the resulting from the signals Ml to M3, rotating with the angle ⁇ pointer increases or decreases in length. From the change in length can be close to a north or south pole.
  • variable-length pointer could be carried out in the context of normal operation current by pulse width modulation without separate measurement voltage pulses 14 to 16.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

L'invention concerne un dispositif pour obtenir, pour l'alimentation en courant d'une machine électrique, une information utile relative à l'état de la machine. Selon l'invention, un dispositif (6, 8) analyse un signal de mesure pour obtenir une information sur l'état de la machine, ce signal étant influencé par la variation d'inductance de conducteurs de phase (1-3) d'enroulements d'excitation de la machine électrique, ces variations faisant suite à un flux de courant traversant les conducteurs de phase. Le signal de mesure peut être, par ex., le potentiel au point neutre 4 de l'étoile formée par les conducteurs de phase (1-3) câblés.
PCT/EP2006/011880 2005-12-15 2006-12-09 Dispositif pour obtenir des informations au moyen de la position du rotor de machines electriques WO2007073854A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06829472A EP1961108A1 (fr) 2005-12-15 2006-12-09 Dispositif pour obtenir des informations au moyen de la position du rotor de machines electriques

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102005059858 2005-12-15
DE102005059858.7 2005-12-15
DE102006046637.3 2006-09-29
DE102006046637A DE102006046637A1 (de) 2005-12-15 2006-09-29 Vorrichtung zur Gewinnung von Informationen über den Betriebszustand elektrischer Maschinen

Publications (1)

Publication Number Publication Date
WO2007073854A1 true WO2007073854A1 (fr) 2007-07-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/011880 WO2007073854A1 (fr) 2005-12-15 2006-12-09 Dispositif pour obtenir des informations au moyen de la position du rotor de machines electriques

Country Status (3)

Country Link
EP (1) EP1961108A1 (fr)
DE (1) DE102006046637A1 (fr)
WO (1) WO2007073854A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219908A1 (de) 2013-10-01 2015-04-02 Continental Teves Ag & Co. Ohg Verfahren zur Steuerung und/oder Regelung einer permanent angeregten Synchronmaschine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110050209A1 (en) 2007-10-09 2011-03-03 Rainer Nase Method and apparatus for unambiguous determination of the rotor position of an electrical machine
DE102010052799A1 (de) 2010-11-24 2012-05-24 Rolf Strothmann Vorrichtung zur Ermittlung der Rotordrehposition einer elektrischen Maschine
DE102011008141A1 (de) * 2011-01-08 2012-07-12 Rolf Strothmann Vorrichtung zur Ermittlung der Position des Läufers einer elektrischen Maschine
DE102012006010A1 (de) 2012-03-24 2013-09-26 Volkswagen Aktiengesellschaft Vorrichtung zur Bestimmung einer Läuferlage einer elektronisch kommutierten elektrischen Maschine
DE202016106678U1 (de) 2016-11-30 2016-12-12 Ebm-Papst Mulfingen Gmbh & Co. Kg Vorrichtung zur Bestimmung der Rotorposition
DE102016123065A1 (de) 2016-11-30 2018-05-30 Ebm-Papst Mulfingen Gmbh & Co. Kg Vorrichtung und Verfahren zur Bestimmung der Rotorposition

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117165A (en) * 1990-06-29 1992-05-26 Seagate Technology, Inc. Closed-loop control of a brushless DC motor from standstill to medium speed
US5159246A (en) * 1990-08-18 1992-10-27 Victor Company Of Japan, Ltd. Detection of relative position between magnetic pole and drive coil in brushless DC motor
EP1005716B1 (fr) 1997-08-18 2001-11-14 Rolf Strothmann Moteur electrique a excitation independante
EP1160966A1 (fr) 2000-05-31 2001-12-05 Ecole Polytechnique Fédérale de Lausanne (EPFL) Procédé de détermination de la position du rotor d'un moteur électromagnétique sans collecteur et dispositif pour sa mise en oeuvre
WO2005046043A1 (fr) * 2003-11-06 2005-05-19 Continental Teves Ag & Co.Ohg Procede de determination de la position du rotor d'une machine synchrone

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117165A (en) * 1990-06-29 1992-05-26 Seagate Technology, Inc. Closed-loop control of a brushless DC motor from standstill to medium speed
US5159246A (en) * 1990-08-18 1992-10-27 Victor Company Of Japan, Ltd. Detection of relative position between magnetic pole and drive coil in brushless DC motor
EP1005716B1 (fr) 1997-08-18 2001-11-14 Rolf Strothmann Moteur electrique a excitation independante
EP1160966A1 (fr) 2000-05-31 2001-12-05 Ecole Polytechnique Fédérale de Lausanne (EPFL) Procédé de détermination de la position du rotor d'un moteur électromagnétique sans collecteur et dispositif pour sa mise en oeuvre
WO2005046043A1 (fr) * 2003-11-06 2005-05-19 Continental Teves Ag & Co.Ohg Procede de determination de la position du rotor d'une machine synchrone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013219908A1 (de) 2013-10-01 2015-04-02 Continental Teves Ag & Co. Ohg Verfahren zur Steuerung und/oder Regelung einer permanent angeregten Synchronmaschine

Also Published As

Publication number Publication date
EP1961108A1 (fr) 2008-08-27
DE102006046637A1 (de) 2007-06-21

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