IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0479024
(2002-05-28)
|
우선권정보 |
DE-0026146 (2001-05-30) |
국제출원번호 |
PCT/EP02/05860
(2003-11-25)
|
§371/§102 date |
20031125
(20031125)
|
국제공개번호 |
WO02/09796
(2002-12-05)
|
발명자
/ 주소 |
- Netz, Achim
- Schr?bler, Sighard
- L?dtke, Holger
- Stauder, Peter
- Schulz, Marcus
|
출원인 / 주소 |
- Continental Teves AG &
- Co., OHG
|
대리인 / 주소 |
Honigman Miller Schwartz and Cohn LLP
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
13 |
초록
▼
The present invention relates to a method for the sensorless electric measurement of the position of a rotor of a permanently excited synchronous machine that is fed by a converter, by means of measuring signals which are sent to an evaluation device that calculates the electric position of the roto
The present invention relates to a method for the sensorless electric measurement of the position of a rotor of a permanently excited synchronous machine that is fed by a converter, by means of measuring signals which are sent to an evaluation device that calculates the electric position of the rotor from the angular dependence of the current space vector at an impressed stator flux pattern, wherein the distribution of absolute values of the differential current space vector varies in approximation in sinusoidal manner with twice the value of the electric rotor position angle sought. The method of the invention which can be used in particular in stationary or blocked machines is characterized in that the distribution of absolute values is produced from respectively two successive measurements for an almost inversed magnetization, in such a way that the superposition of the impressed stator flux and permanently excited rotor flux enables, due to saturation, a distribution of absolute values of the current space vector with two different maximum values, from which the electric rotor position angle sought is determined directly and unambiguously over 360°.
대표청구항
▼
1. Method for measuring the position of a rotor of a permanently excited synchronous machine that is fed by a converter, comprising the stops of:measuring signals which are sent to an evaluation device wherein said evaluation device calculates the electric position of the rotor from the angular depe
1. Method for measuring the position of a rotor of a permanently excited synchronous machine that is fed by a converter, comprising the stops of:measuring signals which are sent to an evaluation device wherein said evaluation device calculates the electric position of the rotor from the angular dependence of the current space vector at an impressed stator flux pattern, wherein the distribution of absolute values of the differential current space vector changes in approximation in sinusoidal manner with twice the value of the electric rotor position angle sought, producing a distribution of absolute values of said differential current space vector from respectively two successive measurements using inversed magnetization, in such a way that the superposition of the impressed stator flux and permanently excited rotor flux enables, due to saturation, an distribution of absolute values of the current space vector with two different maximum values, from which the electric rotor position angle sought is determined directly and unambiguously over 360° of rotor rotation. 2. Method as claimed in claim 1, wherein a star-like stator flux pattern is impressed which, when time averaged, produces almost no torque in the synchronous machine.3. Method as claimed in claim 1, wherein average values of the distribution of absolute values of the differential current space vector are produced, wherein the stator flux pattern is passed through counter-clockwise and clockwise in the individual measurements.4. Method as claimed in claim 1, wherein defined frequency portions in the power density spectrum of the stator flux pattern are reduced.5. Method as claimed in claim 1, wherein the rotor position is determined by cross correlation of the measured distribution of absolute values with a distribution of absolute values stored in tabular form.6. Method as claimed in claim 1, wherein the rotor position is determined by zero settings and extreme values of the measured distribution of absolute values.7. Method as claimed in claim 1, wherein the distribution of absolute values is calculated from the phase currents by means of inverse Clarcke and Park transformation (ICPT).8. Method as claimed claim 1, wherein an assessed value of the distribution of absolute values is determined from the total current of the converter by means of a suitable flux pattern.9. Method as claimed in claim 1, wherein differences of current space vectors at different times of the flux pattern or differences of current time areas are used for determining the distribution of absolute values instead of the time variation of the current space vector.10. Method as claimed in claim 1, wherein a sample of the stator voltage space vector is composed of several base vectors by way of vector modulation and pulse width modulation.11. Circuit configuration for the sensor-free electric rotor position measurement of a permanently excited synchronous machine, comprising:a control-signal generating device, a converter for feeding the synchronous machine, and an evaluation device for evaluating measuring signals generated by a current measuring device, wherein the control-signal generating device includes a pattern generator for generating a stator flux pattern and a sampling signal generator providing control signals for the evaluation device, wherein the converter includes a flux model of the synchronous machine and the current measuring device which determines an energization pattern currently present, and wherein the evaluation device calculates from the energization pattern the distribution of absolute values of the differential current space vector and determines therefrom the electric rotor position angle sought unambiguously over 360° of rotor rotation. 12. Circuit configuration as claimed in claim 11, wherein the control signal generating device includes a clock generator whose clock signal is sent to a counter, whose count is supplied to the pattern generator and the sampling signal generator, wherein the pattern generator predefines a stator flux pattern and the sampling signal generator predefines times for sampling current variations from which the electric rotor position angle sought is derived.13. Circuit configuration as claimed in claim 11, wherein the flux model, by way of a motor flux observer or a flux-measuring device, produces from the stator flux pattern a voltage pattern that is sent to a vector pulse width modulator.14. Circuit configuration as claimed in claim 13, wherein the vector pulse width modulator generates control signals for a polyphase bridge which impresses the energization pattern into the synchronous machine, wherein the phase currents of the polyphase bridge or a supply current of the polyphase bridge or the bridge currents occurring in the polyphase bridge on the ‘high’ or ‘low’ sides are measured.15. Circuit configuration as claimed in claim 14, wherein the current variations being measured are selected by means of a reversing switch.16. Circuit configuration as claimed in claim 11, wherein the evaluation device includes a transformer transforming the measured energization pattern selected by the reversing switch into the distribution of absolute values of the current space vector by means of the predetermined stator flux pattern.17. Circuit configuration as claimed in claim 16, wherein the evaluation device comprises a sampler with subtracting operations, to which is sent the distribution of absolute values of the current space vector and the times furnished by the sampling signal generator and in which the distribution of absolute values of the differential current space vector is produced.18. Circuit configuration as claimed in claim 17, wherein the evaluation device comprises a current-variation evaluation unit which determines the sought electric rotor position angle from the distribution of absolute values of the differential current space vector.19. Circuit configuration as claimed in claim 18, wherein the current-variation evaluation unit issues a plausibility signal, which finds out whether the quality of the distribution of absolute values of the differential current space vector is sufficient for the calculation of the electric rotor position angle.
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