Applying a control unit to an asynchronous machine which is operated without a rotary encoder
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-021/12
H02P-027/06
출원번호
US-0746029
(2008-12-04)
등록번호
US-8350517
(2013-01-08)
우선권정보
DE-10 2007 058 209 (2007-12-04)
국제출원번호
PCT/EP2008/066832
(2008-12-04)
§371/§102 date
20100907
(20100907)
국제공개번호
WO2009/071642
(2009-06-11)
발명자
/ 주소
Stichweh, Heiko
출원인 / 주소
Lenze Drives GmbH
대리인 / 주소
Hunton & Williams LLP
인용정보
피인용 횟수 :
2인용 특허 :
7
초록▼
Exemplary embodiments provide a method for connection or application of a converter to a rotating asynchronous machine which is operated without an encoder, without a high current and without a torque surge. The method provides a control unit, using an inverter or converter, for feeding the asynchro
Exemplary embodiments provide a method for connection or application of a converter to a rotating asynchronous machine which is operated without an encoder, without a high current and without a torque surge. The method provides a control unit, using an inverter or converter, for feeding the asynchronous machine which rotates at a mechanical rotary speed. The asynchronous machine is regulated by the control unit. A stator current vector is ascertained from measured currents of the stator windings of the asynchronous machine and a rotating stator voltage vector. Calculation is effected in respect of a stator flux change vector from the stator current vector, the stator voltage vector and a stator resistance in accordance with a motor model. An angle difference between the stator current vector and the stator flux change vector is calculated. That angle difference is regulated to a reference value of 90° or −90°, wherein an output signal of the regulator corresponds to a rotary field frequency, to be impressed, of the voltage vector of the stator. Regulation is effected in respect of an amplitude of the stator voltage vector by way of a current regulator to which the difference of a current reference value and a parameter corresponding to the amplitude of the stator current is made available at the input as a regulating difference.
대표청구항▼
1. A method of connecting a control unit as inverter or converter to an asynchronous machine operated without encoder, the asynchronous machine having stator windings and being rotatable at a mechanical rotary speed, wherein the asynchronous machine is regulated by the control unit, the method compr
1. A method of connecting a control unit as inverter or converter to an asynchronous machine operated without encoder, the asynchronous machine having stator windings and being rotatable at a mechanical rotary speed, wherein the asynchronous machine is regulated by the control unit, the method comprising: (a) determining a stator current vector from measured currents of the stator windings of the asynchronous machine and a stator voltage vector;(b) calculating a stator flux change vector from the stator current vector, the stator voltage vector and a stator resistance in accordance with a machine model;(c) calculating an angle difference between the stator current vector and the stator flux change vector;(d) regulating the calculated angle difference to a reference value of +90° or −90°, wherein an output signal of an associated regulator corresponds to a rotary field frequency of the stator voltage vector; and(e) regulating an amplitude of the stator voltage vector by way of a current regulator an input thereof being provided with a difference between a current reference value and a value corresponding to the amplitude of the stator current as a regulating difference. 2. The method of claim 1, wherein a reference value of the associated regulator in the form of an angle difference regulator is predetermined in dependence on the direction of rotation of a stator rotary field frequency to 90° or −90°, wherein switching-over with a hysteresis is implemented in particular in the region of a stator rotary field frequency of zero. 3. The method of claim 1, wherein input parameters from the measured currents or from estimated currents, voltages and fluxes or derivatives thereof are predetermined for the associated regulator for angle difference regulation to ascertain a value for the rotary field frequency of the stator or the voltage frequency of the stator. 4. The method of claim 1, wherein a stator flux change vector is formed with the machine model or by way of an estimate from transformed or untransformed parameters of the stator current vector and stator voltage vector. 5. The method of claim 1, wherein a difference angle between the stator current vector and a voltage drop across stator inductances or a change vector of the flux is formed by the machine model or an estimate and said difference angle is used as a value for a controlled or regulated change in the rotary field frequency. 6. The method of claim 1, wherein a current regulator is designed and operates in field-oriented form and a setting value of the q-regulator of the current regulator is used as a correction signal in regulation of the angle difference or in other regions of the connection method. 7. The method of claim 1, wherein connection of the control unit to the asynchronous machine is effected at a different frequency in respect of the machine and the control unit. 8. The method of claim 7 wherein the asynchronous machine rotates at a mechanical rotary speed which is not known to the control unit. 9. The method of claim 1, wherein the asynchronous machine rotates at a mechanical rotary speed which is not known to the control unit. 10. The method of claim 1, wherein the stator current vector is ascertained from measured currents of the stator windings of the asynchronous machine and the impressed stator voltage vector and having regard to an inverter error or an inverter error characteristic. 11. The method of claim 1, wherein the stator flux change vector is calculated in accordance with the machine model and the following equation: U_s=Rsi_s+ⅆⅆtΨ_s. 12. The method of claim 1, wherein the amount of the angle difference is regulated. 13. The method of claim 12, wherein regulation of the angle difference is effected in transformed or untransformed form. 14. The method of claim 1, wherein regulation of the angle difference is effected in transformed or untransformed form. 15. The method of claim 1, wherein a remanence of the asynchronous machine is used by the regulator for the angle difference, insofar as the frequency of a voltage is detected as a torque corresponding to an actual slip frequency of the asynchronous machine. 16. The method of claim 1, wherein anticipatory control of the regulator is effected for the angle difference insofar as a frequency of an induced voltage at least initially at least co-determines the output signal of the regulator. 17. The method of claim 16, wherein the induced voltage has a slip frequency and permanently co-determines the output signal of the regulator for the angle difference. 18. The method of claim 1, wherein connection is connection of the control unit to the asynchronous machine. 19. The method of claim 1, wherein the mechanical rotary speed of the asynchronous machine is substantially zero. 20. The method of claim 1, comprising presetting or impressing of the vector, rotating at a first speed, of the stator voltage for ascertaining the stator current vector from the measured currents of the stator windings and the stator voltage vector. 21. The method of claim 1, wherein the stator voltage vector is impressed as a vector, rotating at a first speed, of a stator voltage. 22. The method of claim 1, wherein the stator voltage vector is an impressed vector, at least at the beginning. 23. The method of claim 1, wherein the stator voltage vector is impressed or predetermined at the beginning. 24. The method of claim 1, wherein the stator voltage vector is initialised with a start value as a frequency in order to be impressed. 25. An apparatus for connecting or applying a control unit as an inverter or converter to an asynchronous machine operable without a rotary encoder, which is rotatable at a mechanical rotary speed, wherein the asynchronous machine is regulatable by the control unit, comprising; (a) a device for determining a stator current vector from measured currents of the stator windings of the asynchronous machine and a stator voltage vector rotating at a frequency;(b) a device with a machine model for calculating a stator flux change vector from the stator current vector, the stator voltage vector and a stator resistance;(c) a device for calculating an angle difference between the stator current vector and the stator flux change vector;(d) a first regulator for regulating the calculated angle difference to a reference value of +90° or −90°, wherein an output signal of the first regulator corresponds to a rotary field frequency to be impressed of the voltage vector of the stator of the asynchronous machine; and(e) a current regulator for regulating an amplitude of the stator voltage vector, wherein a difference of a current reference value and a signal, which corresponds to an amplitude of the stator current, is fed to the current regulator at the input as a regulating difference. 26. The apparatus of claim 25, wherein the stator voltage vector is an impressed vector, at least at the beginning. 27. The apparatus of claim 25, wherein the stator voltage vector is impressed or predetermined at the beginning. 28. The apparatus of claim 25, wherein the stator voltage vector is initialised with a start value as a frequency in order to be impressed. 29. A method of connecting or applying a control unit, as inverter or converter, to an asynchronous machine operated without encoder, which is rotatable at a mechanical rotary speed, wherein the asynchronous machine is regulated by the control unit, comprising: (a) determining a stator current vector from measured currents of the stator windings of the asynchronous machine and the impressed stator voltage vector;(b) calculating a stator flux change vector from the stator current vector, the stator voltage vector and a stator resistance in accordance with a machine model;(c) calculating an angle difference between the stator current vector and the stator flux change vector;(d) regulating the calculated angle difference to a reference value of +90° or −90°, wherein an output signal of the regulator corresponds to a rotary field frequency to be impressed of the voltage vector of the stator; and(e) regulating an amplitude of the stator voltage vector by way of a current regulator to which at the input the difference from a current reference value and a value corresponding to the amplitude of the stator current is made available, as the regulating difference.
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이 특허에 인용된 특허 (7)
Lipo Thomas A. (Madison WI) Moreira Julio C. (Madison WI), Air gap flux measurement using stator third harmonic voltage and uses.
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