CN105897077A - Method for solving low work efficiency in high-speed rotation of high-power brushless motor - Google Patents
Method for solving low work efficiency in high-speed rotation of high-power brushless motor Download PDFInfo
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- CN105897077A CN105897077A CN201410686263.2A CN201410686263A CN105897077A CN 105897077 A CN105897077 A CN 105897077A CN 201410686263 A CN201410686263 A CN 201410686263A CN 105897077 A CN105897077 A CN 105897077A
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Abstract
The invention discloses a method for solving low work efficiency in high-speed rotation of a high-power brushless motor. A phenomenon of inaccurate motor commutation caused by low rotor position signal acquisition accuracy and delay occurred on a hardware transmission channel is solved through a mode of acquiring the rotation speed of the motor in real time and modifying the switching time in real time, so that the work efficiency of the motor is improved, and problems such as too quick temperature rising of the motor are effectively solved. The method disclosed by the invention not only is flexible and variable, but also is simple and convenient in implementation. The more important point is that the method is also applicable to a DC brushless without a position sensor.
Description
Technical field
The present invention relates to a kind of solve the method that during high-power brushless motor high speed, motor working efficiency is low.
Background technology
Direct current generator is when high speed rotating at present, and the motor commutation moment always has delay, and speed is the highest, prolongs
Chi Yue great, the consequence caused is exactly that motor circulation occurs, not only reduces motor working efficiency, Er Qiezao
Become motor temperature rise the most too fast.The precision of Hall installation site is the direct factor causing problem to occur, simultaneously
Signal transmission delay is also one of factor.The deviation of Hall installation site can only be by improving constantly fresh water (FW)
Put down and solve, technical staff is required higher, the precision that different technical staff installs all without equally,
After once Hall is installed, then it is inconvenient to revise setting angle；And signal transmission delay is at electronics
Circuit the most all can have, the transmission signal that the most various single orders, second order high pass low-pass filtering cause
It is all unavoidable for postponing to wait, and saves filtering link and can reduce transmission delay, but simultaneous transmission of signals
There will be again situations such as being easily disturbed, inconsistent.Even if the direct current generator of position-sensor-free is at a high speed
Shi Huanxiang also there will be delay, and motor also there will be circulation, and hazard ratio is bigger.Owing to there is drawbacks described above,
Therefore all can there is the shortcoming inaccurate, that temperature rise is fast that commutates when high speed in existing DC brushless motor, and
Feasible method can not effectively solve again at present.
The principle of electric machine rotation is: the motor rotor position letter that dsp processor senses according to Hall element
Number, inquire about commutation table, then determine to be switched on or off power switch in motor three-phase bridge according to commutation table
The order of pipe, such as the first switching tube in three-phase bridge in Fig. 1, the 3rd the switching tube, (letter of the 5th switching tube
It is referred to as upper arm power switch pipe) and second switch pipe, the 4th switching tube, the 6th switching tube (referred to as underarm
Power switch pipe), make electric current sequentially flow through motor coil and produce forward (or reverse) rotating excitation field, and with
The Magnet of rotor interacts, and motor up time/inverse time so just can be made to rotate.When rotor turns to suddenly
When your sensor sensing goes out the position of another group rotor signal, dsp processor opens next group power the most again
Switching tube, such circulation motor just can rotate according to same direction；Want motor reversal only need to be opened by power
Close pipe and open order reversely.
Summary of the invention
Based on above not enough, the present invention provides a kind of and solves motor work effect during high-power brushless motor high speed
The method that rate is low, be used for solving high-power brushless motor due to rotor-position signal acquisition accuracy the highest with
And occur on hardware transport passage to postpone and the coarse phenomenon of motor commutation that produces, improve motor
Work efficiency, improves motor current waveform, decreases motor temperature rise.
The technical solution of the present invention is as follows: motor work during a kind of solution high-power brushless motor high speed
The method of inefficiency, including brushless motor speed capture step, brushless electric machine commutation step and leads in advance
Lead to and turn off step, measuring the real-time rotating speed of motor by brushless motor speed capture step thus obtain in advance
Conducting and shutoff amount, brushless electric machine commutation step realizes motor commutation, shorting advance and shutoff step and realizes
Commutation drives shorting advance and the shutoff of signal, thus revises due to Hall installation site inaccuracy and letter
Number commutation signal that hardware transport passage causes postpones, it is achieved brushless electric machine runs up；Brushless electric machine turns
Speed capture step includes rotational speed setup part, rotating speed capture portion and shorting advance and turn-off time calculating part
Point, rotational speed setup part provides motor speed reference range, and its value is roundref, rotating speed capture portion
Point by dsp processor by measure between two pulse signals of adjacent arteries and veins of sending of Hall element time
Between T calculate rotating speed round, shorting advance and turn-off time calculating section by the rotating speed calculating gained
Round draws shorting advance and turn-off time Ton/off；Brushless electric machine commutation step and shorting advance and shutoff
Step is fixed by motor commutation voting, and dsp processor sends PWM drive signal and controls pwm driver,
Pwm driver carries out turn-on and turn-off operation, between its operating time according to motor commutation table switch tube
It is divided into shorting advance and turn-off time Ton/off。
The present invention also has a following technical characteristic:
The computational methods of 1, described rotating speed round are as follows: be f by a given frequencymClock arteries and veins
Rushing the successive pulse signals that Hall element sends by enumerator m to count, Hall element often exports
One pulse is all once interrupted to dsp processor application, and dsp processor response is interrupted and from enumerator
Read count value M, simultaneously by counter O reset, calculate rotating speed round,Its
Middle fmFor DSP clock frequency, p is motor pole number.
2, described shorting advance and turn-off timeWherein fon/off
For the frequency of the clock pulse counter f of given frequency, the counting of clock pulse counter f
Value is F；Rotor duration of runs
3, described brushless electric machine commutation step is as follows: motor commutation table is two or two conduction modes, Mei Gezhou
There are 6 kinds of conducting states phase, changes once every 60 ° of electrical angle duties, the change of duty
Comprise and simultaneously turn on and turn off corresponding switching tube；Any time only has 2 switching tubes to simultaneously turn on, switch
The conducting state of pipe is: first, second switching tube conducting, and second and third switching tube turns on, the 3rd, the
Four switching tubes conductings, the four, the 5th switching tubes conductings, the five, the 6th switching tubes conductings, the 6th, the
One switching tube conducting, the time interval of conducting and on-off switching tube is Ton/off。
4, the described switching tube turn-on and turn-off operating time is spaced apart Ton/offMode of operation be: often
Between individual conducting state, clock pulse counter f all counts and resets when initial, and count value is F, logical
Cross enumerator f and draw the rotor T duration of runscount, computing formula is:Work as Tcount
More than or equal to Ton/offTime, perform the operation of switching tube turn-on and turn-off.
5, for single-phase DC brushless motor, described commutation signal refers to electric current commutation signal.
The invention have the advantages that: solve, transmission delay low by Hall mechanical erection precision and technology
The inconsistent motor circulation problem caused of human users's level, improves the work efficiency of motor, improves motor
The problems such as current waveform, effectively solution motor temperature rise are too fast.Owing to improve the efficiency of motor, for
For family, the direct benefit brought is exactly that cost of use significantly reduces, for power supply grid,
The direct benefit brought is exactly that network loss significantly reduces.Method is the most flexible and changeable, and implements
Simple and convenient, more important point is that the present invention is the suitableeest to the DC brushless motor of position-sensor-free
With.
The principle of the present invention is: because motor commutation state is known, it is only necessary in drive signal level
During switching, artificial change its switching time, shorting advance and shutoff can be completed.Shorting advance and pass
Disconnected principle: setting a flag bit, altogether 6 flag bits after motor has commutated every time, motor is common
Have 6 kinds of commutation states), mastery routine sets rolling counters forward, shorting advance and cutoff also have
6 kinds of states, when being calculated to obtain the rotor T duration of runs by count valuecountMore than or equal to Ton/offTime, inquire about phase
The commutation complement mark position answered, completes corresponding shorting advance and turns off computing in advance and carry out leading of switching tube
Logical and shutoff action, upper once commutate time by counter O reset, thus complete corresponding signal in advance
Turning on and turn off in advance, other states are in like manner.
Accompanying drawing explanation
Fig. 1 is the operation logic figure of DC brushless motor；
Fig. 2 is the method flow diagram of the present invention；
Fig. 3 is that rub-out signal of the present invention interrupts flow chart；
Fig. 4 is that flow chart is interrupted in Hall of the present invention capture；
Fig. 5 is the motor current waveform figure before using this method；
Fig. 6 is the motor current waveform figure after using this method.
Detailed description of the invention
In order to be that the mentality of designing of the present invention, technological means are readily apparent from understanding, below by being embodied as
Example also combines accompanying drawing the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, 2, inclined due to hall position during one of the present invention solution high-power brushless motor high speed
The method that difference causes motor working efficiency low is as follows:
A kind of solve the method that during high-power brushless motor high speed, motor working efficiency is low, including brushless electricity
Machine rotating speed capture step, brushless electric machine commutation step and shorting advance and shutoff step, pass through brushless electric machine
Rotating speed capture step is measured the real-time rotating speed of motor thus is obtained shorting advance and shutoff amount, brushless electric machine commutation
Step realizes motor commutation, shorting advance and shutoff step and realizes shorting advance and the pass of commutation driving signal
Disconnected, thus revise the commutation letter caused due to Hall installation site inaccuracy and signal hardware transmission channel
Number postpone, it is achieved brushless electric machine runs up；Brushless motor speed capture step include rotational speed setup part,
Rotating speed capture portion and shorting advance and turn-off time calculating section, rotational speed setup part provides motor speed
Reference range, its value is roundref, and rotating speed capture portion is passed by measuring Hall by dsp processor
Time T between two pulse signals of the adjacent arteries and veins that sensor sends calculates rotating speed round, shorting advance
And turn-off time calculating section is drawn shorting advance and turn-off time by the rotating speed round calculating gained
Ton/off；Brushless electric machine commutation step and shorting advance and shutoff step are determined by motor commutation voting, DSP
Processor sends PWM drive signal and controls pwm driver, and pwm driver is according to motor commutation table
Switch tube carries out turn-on and turn-off operation, and its operating time is spaced apart shorting advance and turn-off time
Ton/off。
The computational methods of described rotating speed round are as follows: be f by a given frequencymClock pulses
The successive pulse signals that Hall element is sent by number device m counts, and Hall element often exports one
Pulse is all once interrupted to dsp processor application, and dsp processor response is interrupted and reads from enumerator
Count value M, simultaneously by counter O reset, calculates rotating speed round,Wherein fm
For DSP clock frequency, p is motor pole number.
Dsp processor gathers the same of the brushless DC motor position signalling of 3 Hall element feedbacks
Time calculate the real-time rotating speed round of rotor, then artificially provide speed reference according to experimental conditions
Roundref, show that three-phase bridge drives signal to shift to an earlier date the time of on/off
Wherein fon/offFor the frequency of enumerator f, enumerator f is with frequency fon/offStart counting up, gate time
As in figure 2 it is shown, Fig. 2 is provided with 6 commutation moment, for T1, T2, T3, T4, T5,
T6, correspond to 6 states of 3 Hall elements of DC brushless motor, three-phase bridge power switch respectively
The action of pipe is as follows: first, second switching tube conducting, and second and third switching tube turns on, and the three, the 4th
Switching tube turns on, the four, the 5th switching tube conductings, the five, the 6th switching tube conductings, and the six, the first
Switching tube turns on.In 6, (its value takes the most corresponding commutation end mark position state of commutation state respectively
1、2、3、4、5、6)。
Each commutation state terminates the value of rear enumerator f and resets.
If Hall element is in the T1 moment, the action of power switch pipe is that first, second switching tube is led
Logical, the value of commutation end mark position state=1, enumerator f resets；The T2 moment, the action of power tube
Being on the conducting of second and third switching tube, the value of commutation end mark position state=2, enumerator f resets；
Other 4 commutation moment are in like manner.
When DC brushless motor commutation state is switched to T2 moment from the T1 moment, power switch pipe dynamic
It is on the 3rd switching tube, turns off the first switching tube.During T1 moment, enumerator f starts counting up, when
Gate time TcountTime T more than or equal to above-mentioned on/off in advanceon/offTime, open the 3rd and open
Closing pipe and turn off the first switching tube, step completes.
When DC brushless motor commutation state is switched to T3 moment from the T2 moment, power switch pipe dynamic
It is on the 4th switching tube, turns off second switch pipe.During T2 moment, enumerator f starts counting up, when
Gate time TcountTime T more than or equal to above-mentioned on/off in advanceon/offTime, open the 4th and open
Closing pipe and turn off second switch pipe, step completes；Other 4 commutation moment are in like manner.
Dsp processor constantly inquires about the value of state, and according to the time T of on/off in advanceon/off, so
The rear corresponding power switch pipe of on/off in advance, so circulates, can be achieved with accurate commutation.
DC brushless motor commutation table
Claims (6)
1. solve the method that during high-power brushless motor high speed, motor working efficiency is low,
It is characterized in that: include brushless motor speed capture step, brushless electric machine commutation step and shift to an earlier date
Conducting and turn off step, by brushless motor speed capture step measure the real-time rotating speed of motor thus
Obtaining shorting advance and shutoff amount, brushless electric machine commutation step realizes motor commutation, shorting advance
And turn off step and realize commutation and drive the shorting advance of signal and shutoff to process, thus revise due to
The motor that the delay that Hall installation site inaccuracy and signal hardware transmission channel often have causes changes
Mutually coarse phenomenon, it is achieved brushless electric machine runs up；Brushless motor speed capture step bag
Include rotational speed setup part, rotating speed capture portion and shorting advance and turn-off time calculating section, turn
The given part of speed provides motor speed reference range, and its value is roundref, rotating speed capture portion
Point by dsp processor by measure two pulse signals of adjacent arteries and veins of sending of Hall element it
Between time T calculate rotating speed round, shorting advance and turn-off time calculating section by calculating
The rotating speed round of gained draws shorting advance and turn-off time Ton/off；Brushless electric machine commutation walks
Rapid and shorting advance is determined by motor commutation voting with turning off step, and dsp processor sends PWM
Driving signal to control pwm driver, pwm driver is according to motor commutation table switch tube
Carrying out turn-on and turn-off operation, its operating time is spaced apart shorting advance and turn-off time Ton/off。
Motor during a kind of solution high-power brushless motor high speed the most according to claim 1
The method that work efficiency is low, it is characterised in that the computational methods of described rotating speed round are such as
Under: it is f by a given frequencymClock pulse counter m Hall element is sent
Successive pulse signals counts, and Hall element often exports a pulse all to DSP process
Device application is once interrupted, and dsp processor response is interrupted and reads count value M from enumerator,
Simultaneously by counter O reset, calculate rotating speedP is motor pole number.
Motor during a kind of solution high-power brushless motor high speed the most according to claim 1
The method that work efficiency is low, it is characterised in that described shorting advance and turn-off timeWherein fon/offFrequency for the clock pulse counter f of given frequency
Rate.
Motor work during a kind of solution high-power brushless motor high speed the most according to claim 1
The method making inefficiency, it is characterised in that described brushless electric machine commutation step is as follows: electricity
Machine commutation table is two or two conduction modes, and there are 6 kinds of conducting states in each cycle, every 60 ° of electricity
Angle duty changes once, and the change of duty comprises and simultaneously turns on and turn off correspondence and open
Guan Guan；Any time only has 2 switching tubes to simultaneously turn on, and the conducting state of switching tube is: the
One, second switch pipe conducting, second and third switching tube turns on, the three, the 4th switching tube conductings,
Four, the 5th switching tube conductings, the five, the 6th switching tube conductings, the six, the first switching tubes
Conducting.
Motor work during a kind of solution high-power brushless motor high speed the most according to claim 1
The method making inefficiency, it is characterised in that described switching tube turn-on and turn-off operating time
It is spaced apart Ton/offMode of operation be, clock pulse counter f between each conducting state
All counting and reset when initial, the count value of clock pulse counter f is F, by counting
Device f calculates to obtain the conducting state time internal rotor T duration of runscount, computing formula isWork as TcountMore than or equal to Ton/offTime, perform the operation of switching tube turn-on and turn-off.
Motor work during a kind of solution high-power brushless motor high speed the most according to claim 1
The method making inefficiency, it is characterised in that: for single-phase DC brushless motor, described changes
Phase signals refers to electric current commutation signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410686263.2A CN105897077A (en) | 2014-11-26 | 2014-11-26 | Method for solving low work efficiency in high-speed rotation of high-power brushless motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410686263.2A CN105897077A (en) | 2014-11-26 | 2014-11-26 | Method for solving low work efficiency in high-speed rotation of high-power brushless motor |
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| CN105897077A true CN105897077A (en) | 2016-08-24 |
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| CN201410686263.2A Pending CN105897077A (en) | 2014-11-26 | 2014-11-26 | Method for solving low work efficiency in high-speed rotation of high-power brushless motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877773A (en) * | 2017-03-30 | 2017-06-20 | 中国电子科技集团公司第二十四研究所 | A kind of efficient velocity feedback PID control device |
| CN107659226A (en) * | 2017-11-07 | 2018-02-02 | 南京理工大学 | A kind of phase change control method of electric steering engine drive device |
| CN108880345A (en) * | 2018-08-20 | 2018-11-23 | 佛山市登拓医疗器械有限公司 | A kind of control method and controller of brushless motor |
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|---|---|---|---|---|
| JP2006020489A (en) * | 2004-07-01 | 2006-01-19 | Samsung Electronics Co Ltd | Control method for brushless dc motor |
| CN102148599A (en) * | 2010-12-22 | 2011-08-10 | 大连理工大学 | Angle position detector of switched reluctance motor and detection method |
| CN103081341A (en) * | 2010-04-16 | 2013-05-01 | 戴森技术有限公司 | Control of a brushless motor |
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2014
- 2014-11-26 CN CN201410686263.2A patent/CN105897077A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006020489A (en) * | 2004-07-01 | 2006-01-19 | Samsung Electronics Co Ltd | Control method for brushless dc motor |
| CN103081341A (en) * | 2010-04-16 | 2013-05-01 | 戴森技术有限公司 | Control of a brushless motor |
| CN102148599A (en) * | 2010-12-22 | 2011-08-10 | 大连理工大学 | Angle position detector of switched reluctance motor and detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877773A (en) * | 2017-03-30 | 2017-06-20 | 中国电子科技集团公司第二十四研究所 | A kind of efficient velocity feedback PID control device |
| CN107659226A (en) * | 2017-11-07 | 2018-02-02 | 南京理工大学 | A kind of phase change control method of electric steering engine drive device |
| CN108880345A (en) * | 2018-08-20 | 2018-11-23 | 佛山市登拓医疗器械有限公司 | A kind of control method and controller of brushless motor |
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