CN203326940U - Counter-electromotive force zero-cross detector for dc brushless motor based on data fusion technology - Google Patents
Counter-electromotive force zero-cross detector for dc brushless motor based on data fusion technology Download PDFInfo
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- CN203326940U CN203326940U CN2013204539483U CN201320453948U CN203326940U CN 203326940 U CN203326940 U CN 203326940U CN 2013204539483 U CN2013204539483 U CN 2013204539483U CN 201320453948 U CN201320453948 U CN 201320453948U CN 203326940 U CN203326940 U CN 203326940U
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Abstract
The utility model relates to a counter-electromotive force zero-cross detector for a dc brushless motor based on data fusion technology, wherein the detector comprises a comparison circuit which uses a comparator to realize counter-electromotive force zero-cross detection and a sampling circuit which carries out AD sampling on u, v, w and n signals in the comparison circuit. The comparison circuit establishes a simulated neutral point in a ten-resistor method, wherein first to tenth resistors are included in the ten-resistor method; voltages of the first resistor, the second resistor, the third resistor and the seventh resistor are divided to realize the simulated neutral point; and the fourth resistor and the tenth resistor are used as a U-phase voltage-dividing resistor of the motor, the fifth resistor and the ninth resistor are used as a V-phase voltage-dividing resistor of the motor, and the sixth resistor and the eighth resistor are used as a W-phase voltage-dividing resistor of the motor. According to the technical scheme of the utility model, technology is reasonable, operation is convenient and more stable and reliable, and zero-cross can be accurately realized, thereby greatly prompting application the dc brushless motor without position control based on a counter-electromotive force zero-cross detection method.
Description
Technical field
The utility model relates to technical field of electricity, relates in particular to a kind of DC brushless motor back-emf zero crossing detection device of based on data integration technology.
Background technology
At present, DC brushless motor is because having that power density is high, efficiency is high, electric machine structure is simple and the characteristics such as good speed adjustment features are widely applied, application without the Position Control technology makes DC brushless motor can save position transducer when moving especially, saved the cost of motor, and simplify and install, be more suitable for being applied to the more severe occasion of some environment.DC brushless motor without positional control algorithm, be by detecting the signals such as stator voltage and electric current, and by the relation of itself and the parameter of electric machine, reasonably the estimation rotor-position signal, comprising: several large classes such as Based on Back-EMF Method, inductance method, state observer method, motor equations computing method, artificial neural network method.This several method has advantage and the limitation of oneself separately, wherein Based on Back-EMF Method is a kind of the most common method in the engineering application, as shown in Figure 1, DC brushless motor three-phase counter potential waveform, can find out that the back-emf zero crossing time delay 30 degree electrical degrees of no power phase commutate constantly exactly.This method is simple, and reliability is high, and the size that only need to compare no power phase terminal voltage and virtual center point when practical application just can obtain information commutating period.
Generally by comparator, realize back-emf zero passage comparison circuit, adopt 10 electric-resistivity method constructing analog neutral points, then, by the terminal voltage signal after the comparison dividing potential drop and simulation neutral point, obtain the level skip signal of back-emf zero passage at comparator output terminal.But this method that detects the back-emf zero cross signal by comparator, because comparator output signal is single, except 0 being exactly 1, can only realize some easy filtering algorithms, a little less than antijamming capability.And motor is when low cruise, the less noise jamming that is subject to of back-emf amplitude, comparator output action frequently, easily cause detecting mistake.Along with uprising of rotating speed, the back-emf signal grow, comparator output can be obviously, and still the appearance because of afterflow generation " degaussing " event also can cause the comparator misoperation, produces wrong commutation.
The utility model content
The utility model is for deficiency of the prior art, a kind of DC brushless motor back-emf zero crossing detection device and method of based on data integration technology are provided, at traditional use comparator, detect on the basis of back-emf zero crossing, adopt AD to detect the back-emf zero crossing simultaneously, and create and detect zero passage information that rule detects two kinds of methods and adopt the Data Fusion method of weighting to combine to realize zero passage detection.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of DC brushless motor back-emf zero crossing detection device of based on data integration technology, comprise the comparison circuit that uses comparator to realize the back-emf zero passage and to u in circuit relatively, v, the sample circuit that w and n signal carry out the AD sampling, described comparison circuit adopts ten electric-resistivity method constructing analog neutral points, described ten electric-resistivity methods comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first resistance wherein, the second resistance, the 3rd resistance and the 7th dividing potential drop realize virtual center point, the 4th resistance and the tenth resistance, the 5th resistance and the 9th resistance, the 6th resistance and the 8th resistance are respectively motor U/V/W three-phase separate piezoresistance.
As preferably, described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance are identical.
As preferably, described the 8th resistance, the 9th resistance, the tenth resistance equate, and the resistance of the 8th resistance is three times of the 7th resistance.
According to the technical solution of the utility model, technology is reasonable, easy to operate, more reliable and more stable, can accurately realize zero passage detection, thereby has greatly advanced the application in D-C brushless electric machine no-position is controlled based on Based on Back-EMF Method.
The accompanying drawing explanation
Fig. 1 is DC brushless motor three-phase counter potential waveform in prior art.
Fig. 2 is comparator circuit schematic diagram in Fig. 1.
The flow chart of the DC brushless motor back-emf zero passage detection embodiment of the method that Fig. 3 is the utility model based on data integration technology.
Fig. 4 is that comparator method and AD sampling method contrast in the output characteristic of near zero-crossing point.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
A kind of DC brushless motor back-emf zero crossing detection device of based on data integration technology, as shown in Figure 2, comprise the comparison circuit that uses comparator to realize the back-emf zero passage and to u in circuit relatively, v, the sample circuit that w and n signal carry out the AD sampling, described comparison circuit adopts ten electric-resistivity method constructing analog neutral points, described ten electric-resistivity methods comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first resistance wherein, the second resistance, the 3rd resistance and the 7th dividing potential drop realize virtual center point, the 4th resistance and the tenth resistance, the 5th resistance and the 9th resistance, the 6th resistance and the 8th resistance are respectively motor U/V/W three-phase separate piezoresistance, described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance are identical, described the 8th resistance, the 9th resistance, the tenth resistance equate, and the resistance of the 8th resistance is three times of the 7th resistance.
A kind of DC brushless motor back-emf zero passage detection method of based on data integration technology, as shown in Figure 3, step comprises,
S1: comparator is carried out to the back-emf zero passage detection;
S2: AD is carried out to the back-emf zero passage detection;
S3: fusion rule is set;
S4: judged according to fusion rule.
In described step S1, the back-emf zero passage detection rule that creates device based on the comparison is as shown in table 1 below, the comparator of current no power phase and virtual mid-point voltage is output as 1, think that it is the TRUE state that k its back-emf of the moment is crossed null event CS1, otherwise CS1 is the FALSE state.
Table 1 is the back-emf zero passage detection rule of device based on the comparison
In described step S2, the back-emf zero passage detection rule of establishment based on AD is as shown in table 2 below, sample current no power phase voltage and virtual mid-point voltage, if current no power phase voltage be greater than 80% of busbar voltage just think k constantly its back-emf to cross null event CS2 be the CC demagnetizing state; Otherwise think that when the no power phase voltage is greater than virtual mid-point voltage it is the TRUE state that its corresponding back-emf is crossed null event CS2, when the no power phase voltage is less than in virtual mid-point voltage, think that it is the FALSE state that its corresponding back-emf is crossed null event CS2.
The back-emf zero passage detection rule of table 2 based on AD
In described step S3, the described fusion rule that arranges be take 30% of rated speed and is divided " low speed " and " at a high speed " as battery limit (BL), and add the detected degaussing event of AD CC to form three state, obtaining the judgment expression that k exports the back-emf zero passage constantly is: CZ (k)=K1 * CS1 (k)+K2 * CS2 (k), wherein the value of CS1 (k) and CS2 (k) is 1, when its state is TURE, otherwise value is-1; Wherein the value of K1 and K2 is as shown in table 3 below;
Get CZ=CZ (k)+CZ (k+1)+CZ (k+2)+..., CZ (k) wherein, CZ (k+1), CZ (k+2) ... correspond to k, k+1 and k+2... zero passage output valve constantly, when CZ is more than or equal to threshold values, wherein the threshold values value is 1.2, is judged as back-emf and crosses the null event generation, preparation time delay commutation, and remove CZ (k), CZ (k+1), CZ (k+2) ... in value.
The value of table 3 weight coefficient K1 and K2
Its specific works principle, detect at traditional use comparator on the basis of back-emf zero crossing, adopts AD sampling phase voltage simultaneously, is about to " u ", " v " in Fig. 4, " w " and " n " signal leading to the AD sampling, thereby also obtains back-emf zero passage information.Because sample signal that relatively device obtains of AD is wanted continuously, not only can obtain the output of " 0 " and " 1 ", and can obtain the amplitude (resolution of amplitude depends on the resolution of AD) of each signal, back-emf signal is carried out to digital filtering algorithm simultaneously, can obtain more really back-emf variation tendency and waveform, more be conducive to the judgement of back-emf zero crossing, also can solve preferably the problem that zero crossing frequently detected of comparator at the back-emf near zero-crossing point, Fig. 4 is that comparator method and AD sampling method contrast in the output characteristic of near zero-crossing point.While for the degaussing event, due to its generation, becoming no power mutually from energising during because of motor commutation, its phase winding afterflow produces, the amplitude of this signal approaches busbar voltage, width is determined by the energy in winding, can only export " 0 " or " 1 " can impact for comparator, but the method that AD is detected, because signal amplitude is known, is disturbed so be easy to this class of elimination.
Data fusion is the new technology of a kind of information processing of launching for using a plurality of transducers or this problem of detection method in a system, it utilizes the observation information of computer technology to some transducers of obtaining in chronological order, automatic analysis, comprehensive in addition under certain criterion, thus needed decision-making and estimation task completed and the information process that carries out.Compare with the result of only utilizing single-sensor or detection method to measure acquisition, adopt the method for data fusion can estimate more accurately the value of measured parameter, thereby reduce the error that may occur in information processing.And in data fusion weighted mean method be in the signal level fusion method, the most easily realize, direct-vision method, its redundant information that one group of transducer is provided is weighted on average, result is exported as the fusion value.Here create corresponding zero passage detection rule, after after comparator and AD sampling, obtaining back-emf zero passage information, operating mode in conjunction with work at present adopts the Data fusion technique of above-mentioned weighting by both zero passage detection informixs, obtain back-emf zero passage information, the more reliable and stable zero passage detection that realized accurately.
In a word, the foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (3)
1. the DC brushless motor back-emf zero crossing detection device of a based on data integration technology, it is characterized in that, comprise the comparison circuit that uses comparator to realize the back-emf zero passage and to u in circuit relatively, v, the sample circuit that w and n signal carry out the AD sampling, described comparison circuit adopts ten electric-resistivity method constructing analog neutral points, described ten electric-resistivity methods comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first resistance wherein, the second resistance, the 3rd resistance and the 7th dividing potential drop realize virtual center point, the 4th resistance and the tenth resistance, the 5th resistance and the 9th resistance, the 6th resistance and the 8th resistance are respectively motor U/V/W three-phase separate piezoresistance.
2. the DC brushless motor back-emf zero crossing detection device of based on data integration technology according to claim 1, is characterized in that, described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance are identical.
3. the DC brushless motor back-emf zero crossing detection device of based on data integration technology according to claim 1, it is characterized in that, described the 8th resistance, the 9th resistance, the tenth resistance equate, and the resistance of the 8th resistance is three times of the 7th resistance.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337995A (en) * | 2013-07-27 | 2013-10-02 | 湖北立锐机电有限公司 | Data fusion technology-based direct current brushless motor counter potential zero crossing detection device and method |
| CN110535378A (en) * | 2019-08-27 | 2019-12-03 | 江苏科技大学 | Brshless DC motor high-precision changes facies-controlled method and system |
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- 2013-07-27 CN CN2013204539483U patent/CN203326940U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337995A (en) * | 2013-07-27 | 2013-10-02 | 湖北立锐机电有限公司 | Data fusion technology-based direct current brushless motor counter potential zero crossing detection device and method |
| CN110535378A (en) * | 2019-08-27 | 2019-12-03 | 江苏科技大学 | Brshless DC motor high-precision changes facies-controlled method and system |
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