CN103217545A - Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor - Google Patents
Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor Download PDFInfo
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- CN103217545A CN103217545A CN2013101007465A CN201310100746A CN103217545A CN 103217545 A CN103217545 A CN 103217545A CN 2013101007465 A CN2013101007465 A CN 2013101007465A CN 201310100746 A CN201310100746 A CN 201310100746A CN 103217545 A CN103217545 A CN 103217545A
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Abstract
The invention discloses a method for judging fault tolerance and abnormality of a rotating speed signal of a synchronous motor. Speed measuring fluted discs are mounted at one or more positions of a main shaft of the synchronous motor; after the motor is started, the fluted discs rotate along with the main shaft; one or more speed measuring sensors fixed on disc faces generate periodic waveform electric signals under the action of electromagnetic induction; after the device receives the rotating speed signal, the device processes the rotating speed signal according to the following steps of: carrying out high-frequency counting on each channel rotating speed signal to obtain a pulse period counting value; judging the fault tolerance and the abnormality of single channel signal; judging the fault tolerance and the abnormality of different channel signals of the same speed measuring fluted disc; judging the fault tolerance and the abnormality of two channel rotating speed signals of different speed measuring fluted discs; obtaining the mechanical rotating speed according to the rotating speed pulse counting value and obtaining electrical capacity frequency according to an electrical capacity signal of the synchronous motor; and checking the mechanical rotating speed by using the electrical capacity frequency. According to the method, the abnormality judgment and fault tolerance processing of the rotating speed signal can be accurately and reliably carried out.
Description
Technical field
The invention belongs to field of power, particularly the rotating speed of the large-scale synchronous motor equipment of industrial enterprise such as power house, steel plant or torsional vibration signals are measured and fault-tolerance processing method.
Background technology
In electric system, extensively adopt various speed probes to obtain the tach signal of synchronous motor equipment, obtain information such as real-time rotating speed, big axial torsional vibration, merit angle through follow-up hardware and software signal Processing, and then be used for the running status of surveillance equipment or do further FEEDBACK CONTROL.Accurate measurement to tach signal just seems very important, if signal distortion or fault-tolerant processing defectiveness, can cause protecting or the malfunction behavior of opertaing device, and then cause the operation exception or the damage of motor device, and consequence is very serious.In order to improve measuring accuracy and reliability, usually velocity-measuring system is done various processing, as improving the machining accuracy of velocity-measuring system, system mask isolation, signal interference protection measure or the like.Sometimes, in order can in anticipation in particular cases to damage or dead electricity as holes probe, also can obtain tach signal incessantly, velocity-measuring system adopts redundant configuration.At this moment, device can receive two-way or multichannel tach signal, and is at present comparatively simple to the processing of multichannel tach signal, and a spot of fault-tolerant measure is only arranged.For the higher occasion of the reliability requirement of tachometric survey, need fault-tolerant processing and anomalous discrimination more accurately and reliably.
Summary of the invention
Purpose of the present invention is to provide the method for the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, and it can carry out tach signal anomalous discrimination and fault-tolerant processing accurately and reliably.
In order to reach above-mentioned purpose, solution of the present invention is:
The method of the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, speed measuring fluted disc is installed in one or more positions at the synchronous motor macro-axis, behind the electric motor starting, fluted disc rotates with macro-axis, the single or multiple tachogenerators that are fixed in the card top produce the electric signal that is periodic waveform under the electromagnetic induction effect, after device receives tach signal, handle according to the following steps:
(1) each passage tach signal high-frequency count is obtained the recurrence interval count value;
(2) the fault-tolerant and anomalous discrimination of single channel signal;
(3) the fault-tolerant and anomalous discrimination of different channel signals of same speed measuring fluted disc;
(4) two of different speed measuring fluted discs fault-tolerant and anomalous discriminations of passage tach signal;
(5) obtain mechanical separator speed by the tacho-pulse count value, obtain the electric parameters frequency by synchronous motor electric parameters signal;
(6) with electric parameters frequency verification mechanical separator speed.
The particular content of above-mentioned steps (1) is: device receives the rotational speed pulse signal of a plurality of passages of synchronous motor fluted disc speed measuring sensor, obtains the recurrence interval count value T of each passage corresponding to current rotating speed through shaping amplification, high-frequency count
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represented speed probe place fluted disc sequence number, second subscript represented speed probe probe sequence number on the same fluted disc.
The particular content of above-mentioned steps (2) is: with this count value of i passage T
M, i(n) with count value T last time
M, i(n-1) compare, if satisfy:
| T
M, i(n)-T
M, i(n-1) |〉T
M, i(n-1)/K
1.setFormula 1.
Then abandon this count value T
M, i(n), with T
M, i(n-1) compose to T
M, i(n);
Formula 1. in, K
1.setBe definite value, get 10～40;
If this sudden change is satisfied in the times N that t occurred in the time:
Think that then tach signal is unusual;
Formula 2. in, C
SetGet 0.5～1,
Be the current mean speed of synchronous motor, unit: rpm.
The particular content of above-mentioned steps (3) is: with the i channel counts value T of m installed position speed measuring fluted disc
M, i(n) with (i+1) channel counts value T
M, i+1(n) compare, if satisfy:
| T
M, i+1(n)-T
M, i(n) |〉(T
M, i+1(n)+T
M, i(n))/K
2.setFormula 3.
Be correct signal then, its count value is composed to the another one passage, and if the lasting T of this difference with less count value passage
1.set, think that then tach signal is unusual;
Formula 3. in, K
2.setBe definite value, get 10～40; T
1.setGet 0.1～0.5s;
Then two channel counts values after the fault-tolerant processing are the synthetic velocity gauge numerical value T that on average obtains this m installed position
m(n):
T
m(n)=(T
m,i(n)+T
m,i+1(n))/2。
The particular content of above-mentioned steps (4) is: the synthetic velocity gauge numerical value T that gets j and k installed position speed measuring fluted disc
j(n) and T
k(n) compare, if satisfy:
| T
j(n)-T
k(n) |〉(T
j(n)+T
k(n))/K
3.setFormula 4.
And this difference continues to occur T
2.set, then think the two one of channel abnormal, next use the electric parameters frequency that the two is carried out verification;
Formula 4. in, K
3.setBe definite value, get 10～40; T
2.setGet 0.1～0.5s.
The particular content of above-mentioned steps (5) is: by the synthetic velocity gauge numerical value T of certain speed measuring fluted disc l installed position
l(n), obtain the mechanical separator speed n of motor in conjunction with the velocity-measuring system calculation of parameter:
Formula 5. in, f
cBe the device counter frequency, M is the speed measuring fluted disc number of teeth, and the unit of mechanical separator speed n is rpm;
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use frequency measurement algorithm obtains the electric parameters frequency f of electric rotating machine, unit: Hz.
The particular content of above-mentioned steps (6) is: come verification machinery rotation speed n with the electric parameters frequency f, if satisfy:
| np-60f|〉K
4.setFormula 6.
If this difference continues T
3.set, then think this channel abnormal;
Formula 6. in, K
4.setBe definite value, get 240～420, p is the synchronous motor number of pole-pairs, T
3.setGet 0.5～1s.
After adopting such scheme, the present invention is by the mutual school to the count value of a plurality of passages that test the speed, and the comparison of mechanical separator speed and electric parameters frequency, can position and discern the tach signal abnormal passage exactly, and carry out corresponding fault-tolerant processing, improved the accuracy and the reliability of tachometric survey.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is certain power plant's fluted disc speed measuring system layout synoptic diagram;
Fig. 3 is the recurrence interval counting synoptic diagram that adopts along the high-frequency counter that triggers.
Embodiment
As shown in Figure 1, the invention provides the method for the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, at first speed measuring fluted disc is installed in one or more positions of synchronous motor macro-axis, after the electric motor starting, fluted disc rotates with macro-axis, the single or multiple tachogenerators that are fixed in the card top produce the electric signal that is periodic waveform under the electromagnetic induction effect, its cycle constantly changes with current rotating speed.After device received tach signal, processing procedure was as follows:
(1) device receives the rotational speed pulse signal of a plurality of passages of synchronous motor fluted disc speed measuring sensor, obtains the recurrence interval count value T of each passage corresponding to current rotating speed through shaping amplification, high-frequency count
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represented speed probe place fluted disc sequence number, second subscript represented speed probe probe sequence number on the same fluted disc;
(2) because the rotating speed of motor device is a continually varying, concerning each road tach signal, the count value that front and back are twice does not have big sudden change, with this count value of i passage T
M, i(n) with count value T last time
M, i(n-1) compare, if satisfy:
| T
M, i(n)-T
M, i(n-1) |〉T
M, i(n-1)/K
1.setFormula 1.
Then abandon this count value T
M, i(n), with T
M, i(n-1) compose to T
M, i(n).
Formula 1. in, K
1.setBe definite value, get 10～40.
If this sudden change is satisfied in the times N that t occurred in the time:
Think that then tach signal is unusual.
Formula 2. in, C
SetGet 0.5～1,
Be the current mean speed of synchronous motor (rpm of unit).
(3) any two of same speed measuring fluted disc test the speed, and the recurrence interval count value in the moment should be equal substantially together for passage.I channel counts value T with m installed position speed measuring fluted disc
M, i(n) with (i+1) channel counts value T
M, i+1(n) compare, if satisfy:
| T
M, i+1(n)-T
M, i(n) |〉(T
M, i+1(n)+T
M, i(n))/K
2.setFormula 3.
Then with less count value passage be correct signal (for example: if T
M, i(n)＜T
M, i+1(n), then with T
M, i(n) compose to T
M, i+1(n)), and if the lasting T of this difference
1.set(T
1.setGet 0.1～0.5s), think that then tach signal is unusual.
Formula 3. in, K
2.setBe definite value, get 10～40.
Then two channel counts values are the synthetic velocity gauge numerical value T that on average obtains this m installed position
m(n):
T
m(n)=(T
m,i(n)+T
m,i+1(n))/2
(4) any two of different speed measuring fluted discs test the speed, and the recurrence interval count value in the moment should be comparatively approaching together for passage, gets the synthetic velocity gauge numerical value T of j and k installed position speed measuring fluted disc
j(n) and T
k(n) compare, if satisfy:
| T
j(n)-T
k(n) |〉(T
j(n)+T
k(n))/K
3.setFormula 4.
And this difference continues to occur T
2.set(T
2.setGet 0.1～0.5s), then think the two one of channel abnormal, next use the electric parameters frequency that the two is carried out verification.
Formula 4. in, K
3.setBe definite value, get 10～40.
(5) by the synthetic velocity gauge numerical value T of certain speed measuring fluted disc l installed position
l(n), obtain the rpm of mechanical separator speed n(unit of motor in conjunction with the velocity-measuring system calculation of parameter):
Formula 5. in, f
cBe the device counter frequency, M is the speed measuring fluted disc number of teeth.
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use the frequency measurement algorithm to obtain the electric parameters frequency f (Hz of unit) of electric rotating machine;
(6) come verification machinery rotation speed n with the electric parameters frequency f, if satisfy:
| np-60f|〉K
4.setFormula 6.
If this difference continues T
3.set(T
3.setGet 0.5～1s), then think this channel abnormal.
Formula 6. in, K
4.setBe definite value, get 240～420, p is the synchronous motor number of pole-pairs.
Below with reference to accompanying drawing, the velocity-measuring system of being installed with certain homemade 600MW fired power generating unit is an example, and the specific embodiment of the present invention is described.
Whole velocity-measuring system arrangenent diagram as shown in Figure 2.This unit rated speed is 3000rpm, at the vapour end (high pressure cylinder side) of macro-axis with encourage end (exciter side) and be separately installed with a speed measuring fluted disc, the fluted disc number of teeth is respectively 134 and 86, and two tachogenerators are installed on each speed measuring fluted disc, and the rotational speed pulse signal of output is delivered to device through secondary cable.The three-phase voltage signal of machine potential transformer is also delivered to device.
By signal processing shown in Figure 1, it is as follows to decompose each step:
(1) as shown in Figure 3, device is to count the rotational speed pulse signal of each passage along triggering mode, and count frequency is 20MHz, obtains corresponding to difference count value sequence constantly.Count value sequence as the 1st passage that tests the speed of macro-axis vapour end place speed measuring fluted disc is T
1,1(1), T
1,1(2) ..., T
1,1(n), the count value sequence of the 2nd passage that tests the speed is T
1,2(1), T
1,2(2) ..., T
1,2(n).The count value sequence that macro-axis is encouraged the 1st passage that tests the speed of end place speed measuring fluted disc is T
2,1(1), T
2,1(2) ..., T
2,1(n), the count value sequence of the 2nd passage that tests the speed is T
2,2(1), T
2,2(2) ..., T
2,2(n);
(2) current count value to each passage that tests the speed carries out verification and fault-tolerant.Current count value as the 1st passage that tests the speed in macro-axis vapour end place is T
1,1(n), if satisfy:
|T
1,1(n)-T
1,1(n-1)|>T
1,1(n-1)/K
1.set
Think that then this count value is unusual, give up this value, T
1,1(n-1) assignment is given T
1,1(n).If this sudden change occurs in the time thinking that then tach signal is unusual more than 8 times at 0.2s.
Wherein, K
1.setGet 10～40, get 16 herein.
Other passage that tests the speed deals with that passage is identical therewith.
(3) to the vapour end or encourage the test the speed count value of passage of end place difference and carry out mutual school and fault-tolerant.As the 1st at vapour end place and the 2nd the passage current count value that tests the speed are compared, if satisfy:
|T
1,2(n)-T
1,1(n)|>(T
1,2(n)+T
1,1(n))/K
2.set
Then with less count value passage be correct signal (for example: if T
1,1(n)＜T
1,2(n), then with T
1,1(n) compose to T
1,2(n)), and if the lasting 0.2s of this difference, think that then tach signal is unusual.
Wherein, K
2.setGet 10～40, get 16 herein.
Then two channel counts values are the synthetic velocity gauge numerical value T that on average obtains this installed position
1(n):
T
1(n)=(T
1,1(n)+T
1,2(n))/2
Encourage the two-way speed control channel at end place and handle like this, can obtain synthetic rotating speed T
2(n).
(4) vapour end and the synthetic velocity gauge numerical value of encouraging the end place are carried out mutual school, if satisfy:
|T
1(n)-T
2(n)|>(T
1(n)+T
2(n))/K
3.set
If 0.2s continue to take place this difference, think that then the result that tests the speed of two places must have a place unusual.Next use the electric parameters frequency that the two is carried out verification.
Wherein, K
3.setGet 10～40, get 16 herein.
(5) by the vapour end with encourage the synthetic velocity gauge numerical value T in end place
1(n) and T
2(n), calculate mechanical separator speed n in conjunction with the velocity-measuring system parameter respectively by following formula
1And n
2:
Wherein, f
cFor the device counter frequency, be 20MHz herein, M
1Be the vapour end place speed measuring fluted disc number of teeth, be 134 herein.M
2For encouraging the end place speed measuring fluted disc number of teeth, be 86 herein.
(6) device is sampled to the voltage transformer secondary side voltage of synchronous motor installation, obtains three-phase voltage U
a, U
b, U
c, use the frequency measurement algorithm obtain synchronous motor the electric parameters frequency f (referring to " and Li Yiquan, what Pentium. a kind of high-precision frequency measurement method [J] based on fourier algorithm. Proceedings of the CSEE .200626 (2) .78-81 ").
With mechanical separator speed n
1, n
2Compare with the electric parameters frequency f, if satisfy:
|n·p-60·f|=|n-60·f|>K
4.set
If this difference continues 0.5s, then think this channel abnormal.
Wherein, K
4.setGet 240～420, get 240 herein, p is the synchronous motor number of pole-pairs, gets 1 herein.
Adopt said method, can determine the passage that tests the speed unusually accurately, and carry out corresponding fault-tolerant processing, improved the accuracy and the reliability of tachometric survey.The inventive method is simple, is convenient to realize.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of being done on the technical scheme basis all falls within the protection domain of the present invention.
Claims (7)
1. the method for the fault-tolerant and anomalous discrimination of a synchronous motor tach signal, speed measuring fluted disc is installed in one or more positions at the synchronous motor macro-axis, behind the electric motor starting, fluted disc rotates with macro-axis, and the single or multiple tachogenerators that are fixed in the card top produce the electric signal that is periodic waveform under the electromagnetic induction effect; It is characterized in that: after device receives tach signal, handle according to the following steps:
(1) each passage tach signal high-frequency count is obtained the recurrence interval count value;
(2) the fault-tolerant and anomalous discrimination of single channel signal;
(3) the fault-tolerant and anomalous discrimination of different channel signals of same speed measuring fluted disc;
(4) two of different speed measuring fluted discs fault-tolerant and anomalous discriminations of passage tach signal;
(5) obtain mechanical separator speed by the tacho-pulse count value, obtain the electric parameters frequency by synchronous motor electric parameters signal;
(6) with electric parameters frequency verification mechanical separator speed.
2. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 1, it is characterized in that: the particular content of described step (1) is: device receives the rotational speed pulse signal of a plurality of passages of synchronous motor fluted disc speed measuring sensor, obtains the recurrence interval count value T of each passage corresponding to current rotating speed through shaping amplification, high-frequency count
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represented speed probe place fluted disc sequence number, second subscript represented speed probe probe sequence number on the same fluted disc.
3. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 2, it is characterized in that: the particular content of described step (2) is: with this count value of i passage T
M, i(n) with count value T last time
M, i(n-1) compare, if satisfy:
| T
M, i(n)-T
M, i(n-1) |〉T
M, i(n-1)/K
1.setFormula 1.
Then abandon this count value T
M, i(n), with T
M, i(n-1) compose to T
M, i(n);
Formula 1. in, K
1.setBe definite value, get 10～40;
If this sudden change is satisfied in the times N that t occurred in the time:
Think that then tach signal is unusual;
Formula 2. in, C
SetGet 0.5～1,
Be the current mean speed of synchronous motor, unit: rpm.
4. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 3, it is characterized in that: the particular content of described step (3) is: with the i channel counts value T of m installed position speed measuring fluted disc
M, i(n) with (i+1) channel counts value T
M, i+1(n) compare, if satisfy:
| T
M, i+1(n)-T
M, i(n) |〉(T
M, i+1(n)+T
M, i(n))/K
2.setFormula 3.
Be correct signal then, its count value is composed to the another one passage, and if the lasting T of this difference with less count value passage
1.set, think that then tach signal is unusual;
Formula 3. in, K
2.setBe definite value, get 10～40; T
1.setGet 0.1～0.5s;
Then two channel counts values after the fault-tolerant processing are the synthetic velocity gauge numerical value T that on average obtains this m installed position
m(n):
T
m(n)=(T
m,i(n)+T
m,i+1(n))/2。
5. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 4, it is characterized in that: the particular content of described step (4) is: the synthetic velocity gauge numerical value T that gets j and k installed position speed measuring fluted disc
j(n) and T
k(n) compare, if satisfy:
| T
j(n)-T
k(n) |〉(T
j(n)+T
k(n))/K
3.setFormula 4.
And this difference continues to occur T
2.set, then think the two one of channel abnormal, next use the electric parameters frequency that the two is carried out verification;
Formula 4. in, K
3.setBe definite value, get 10～40; T
2.setGet 0.1～0.5s.
6. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 5, it is characterized in that: the particular content of described step (5) is: by the synthetic velocity gauge numerical value T of certain speed measuring fluted disc l installed position
l(n), obtain the mechanical separator speed n of motor in conjunction with the velocity-measuring system calculation of parameter:
Formula 5. in, f
cBe the device counter frequency, M is the speed measuring fluted disc number of teeth, and the unit of mechanical separator speed n is rpm;
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use frequency measurement algorithm obtains the electric parameters frequency f of electric rotating machine, unit: Hz.
7. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 6, it is characterized in that: the particular content of described step (6) is: come verification machinery rotation speed n with the electric parameters frequency f, if satisfy:
| np-60f|〉K
4.setFormula 6.
If this difference continues T
3.set, then think this channel abnormal;
Formula 6. in, K
4.setBe definite value, get 240～420, p is the synchronous motor number of pole-pairs, T
3.setGet 0.5～1s.
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| CN105203793A (en) * | 2015-09-21 | 2015-12-30 | 杭州比孚科技有限公司 | Method for accurately measuring rotation speed of gear |
| CN105518468A (en) * | 2013-09-06 | 2016-04-20 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Error transmission in two-level rotational speed sensor |
| CN105628955A (en) * | 2015-12-25 | 2016-06-01 | 南京南瑞集团公司 | Speed measurement device for pump storage group static frequency converter and speed measurement method thereof |
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| CN105203793A (en) * | 2015-09-21 | 2015-12-30 | 杭州比孚科技有限公司 | Method for accurately measuring rotation speed of gear |
| CN105628955A (en) * | 2015-12-25 | 2016-06-01 | 南京南瑞集团公司 | Speed measurement device for pump storage group static frequency converter and speed measurement method thereof |
| CN105628955B (en) * | 2015-12-25 | 2018-10-30 | 南京南瑞集团公司 | A kind of speed measuring device and its speed-measuring method of pump-storage generator static frequency changer |
| CN111007281A (en) * | 2019-12-27 | 2020-04-14 | 华中科技大学 | Method and system for diagnosing faults of rotating speed sensor based on wavelet function correlation |
| CN111007281B (en) * | 2019-12-27 | 2020-11-17 | 华中科技大学 | Method and system for diagnosing faults of rotating speed sensor based on wavelet function correlation |
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| CN114439664B (en) * | 2020-10-30 | 2024-05-24 | 通用汽车环球科技运作有限责任公司 | Control of pre-engagement pinion starter |
| CN112345786A (en) * | 2020-11-23 | 2021-02-09 | 浙江浙能技术研究院有限公司 | Magnetic resistance type fluted disc speed measuring system and rotating speed calculating method |
| CN113655234A (en) * | 2021-08-11 | 2021-11-16 | 三一重能股份有限公司 | Speed measuring disc, rotating speed and positioning measuring system and method thereof |
| CN114137465A (en) * | 2021-11-24 | 2022-03-04 | 浙江威星智能仪表股份有限公司 | Detection and correction method for double-Hall metering abnormity |
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