CN106685273A - Control system and control method of brushless DC motor - Google Patents
Control system and control method of brushless DC motor Download PDFInfo
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- CN106685273A CN106685273A CN201611095742.2A CN201611095742A CN106685273A CN 106685273 A CN106685273 A CN 106685273A CN 201611095742 A CN201611095742 A CN 201611095742A CN 106685273 A CN106685273 A CN 106685273A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a control system and control method of a brushless DC motor. A digital signal processor of the system is connected with the brushless DC motor through a rotor position sensor, an input end of a three-phase inverter circuit is connected with the digital signal processor and an output end of the three-phase inverter circuit is connected with the brushless DC motor. The method comprises the steps of setting a rotating speed error value; positioning a rotor to obtain a current position of the rotor of the brushless DC motor and simultaneously calculating a current rotating speed of the motor through the digital signal processor; calculating a current rotating speed error according to a given rotating speed and the current rotating speed, judging whether the current rotating speed error is greater than a set value or not, if so, making the motor begin to commutate until the set rotating speed is reached; and if the current rotating speed error is smaller than the set value, turning off all switch tubes and waiting the next rotor position until the current rotating speed error is greater than the set value. According to the control system and the control method, the switching times of the switch tubes on the three-phase inverter circuit can be reduced, thereby achieving the targets of prolonging the service life of the switch tubes, reducing the heating losses of the switch tubes and improving the efficiency and the stability of the control system.
Description
Technical field
The present invention relates to the control field of brshless DC motor, and in particular to a kind of control system of brshless DC motor and
Control method.
Background technology
When conventional brushless DC motor works, rotor often rotates 60 ° of electrical angles, and the break-make of switching tube will on inverter circuit
Change once, the alternating break-make of switching tube makes stator winding produce rotating excitation field, and rotor could rotate.For whole brushless direct-current
Electric machine control system, switching tube is a critical elements.
But, some problems are also brought along using switching tube：Switching tube is not a perfect switch, and itself is also present
The various thermal losses such as switching loss, conduction loss, all kinds of thermal losses are relevant with the specifically used environment of switching tube, brushless dc
The thermal losses of machine switching tube is mainly switching loss, and for high-power switch tube, single tube thermal losses is up to upper hectowatt, it is sometimes desirable to
Fan carries out active heat removal, and thermal losses reduces the whole efficiency of brushless DC motor control system；Switching tube being opened and closes
Disconnected process is more sensitive to temperature, and temperature is too high to influence the stability of inverter circuit, and switching tube can be also burnt when radiating bad,
In actual use, the major reason that switching tube is damaged is exactly that high temperature causes to burn；The life-span of switching tube is its switch
Total degree is limited, it is necessary to regularly replace.Caused by problem above is the switching characteristic by switching tube, work as brshless DC motor
During with some certain types of loads, and rotor is not needed often to rotate 60 ° of electrical angles with regard to switching tube of break-make.Therefore, it can
By improving the control method of brshless DC motor, the influence that above mentioned problem is caused is reduced.
The content of the invention
The invention provides the control system and control method of a kind of brshless DC motor, when brshless DC motor institute, band is negative
Load is that the control system and control method can when being loaded to the load not high of rotating speed control accuracy requirement or rotating speed low torque high
The on-off times of switching tube on three-phase inverting circuit are reduced, extension switch tube lifetime is reached, is reduced switching tube heating loss, improves
The purpose of control system efficiency and stability.
The control system of brshless DC motor of the invention, the technical scheme for being used to achieve the above object is：Bag
Include brshless DC motor, rotor-position sensor, digital signal processor and three-phase inverting circuit, the digital signal processor
Brshless DC motor, the input connection Digital Signal Processing of the three-phase inverting circuit are connected by rotor-position sensor
The output end connection brshless DC motor of device, three-phase inverting circuit.
Further, the digital signal processor connects the input of three-phase inverting circuit by drive circuit.
Further, the connecting line between the three-phase inverting circuit and brshless DC motor is connected by current detection circuit
Connect digital signal processor.
Further, the rotor-position sensor is hall position sensor.
Further, six switching tubes of the three-phase inverting circuit use insulated gate bipolar transistor (IGBT).
The control method of brshless DC motor of the invention, the technical scheme for being used to achieve the above object is to include
Following steps：
S1, sets the difference of a speed error value, the i.e. given rotating speed of motor and actual speed as needed；
S2, after electric motor starting, to rotor fixed position to obtain the current location of the rotor of brshless DC motor, while passing through number
Word signal processor calculates the current rotating speed of motor；
Whether S3, calculates current speed error and judges it more than setting value according to given rotating speed and current rotating speed,
If judging current speed error more than setting value, motor starts commutation until reaching setting speed；If judging current
Speed error is less than setting value, then turn off all switching tubes on three-phase inverting circuit, next rotor-position is waited, until working as
Preceding speed error is more than setting value.
Further, in step s 2, the current location of brushless DC motor rotor is obtained by hall position sensor.
Further, in step s 2, the current rotating speed of brshless DC motor by digital signal processor according to adjacent two
The time interval of secondary rotor-position signal and the number of pole-pairs of motor are calculated and obtained, and computing formula is：
Wherein, T is that brushless DC motor rotor rotates 60 ° of times of electrical angle, and p is motor number of pole-pairs.
The beneficial effects of the invention are as follows：The brshless DC motor institute bringing onto load that control method of the invention is related to is rotating speed high
Low torque is loaded or the load not high to rotating speed control accuracy requirement.Control method of the invention, sets one as needed first
Individual speed error value, after electric motor starting, the hall position sensor on stator obtains working as brushless DC motor rotor
Front position, while digital signal processor calculates the current rotating speed of motor, then calculates with current rotating speed according to given rotating speed and works as
Whether preceding speed error simultaneously judges it more than setting value, if judging current speed error more than setting value, it is straight that motor starts commutation
Setting speed is reached, current speed error, less than setting value, turns off all switching tubes on three-phase inverting circuit if judging,
Next rotor-position is waited, until current speed error is more than setting value, motor starts commutation, during this period, even if rotating speed
Error is less than setting value, also will not on-off switching tube, motor can continuous commutation reach setting speed until rotating speed, so follow repeatedly
Ring, controlled motor operation, so as to extend the use of switching tube by reducing the method for switching tube on-off times on inverter circuit
Life-span, and the thermal losses of switching tube is reduced, improve the efficiency and stability of control system；If the cooling system of switching tube
Break down (such as thermistor failure), additionally it is possible to reduce the probability that switching tube is burned out.This control method does not influence motor
Output effect or reach identical output effect.
Brief description of the drawings
Fig. 1 is the structural representation of control system of the invention；
Fig. 2 is the flow chart of control method of the invention；
Fig. 3 for PWM ripples dutycycle be 0.75 when, the turn-on sequence figure of IGBT and stator winding；
When Fig. 4 starts AB phases after steady-state operation and first turns on to set motor, the turn-on sequence figure of IGBT and stator winding；
Fig. 5 is control process figure of the invention.
Specific embodiment
Reference picture 1, the control system of the brshless DC motor, including brshless DC motor 1, rotor-position sensor 2, number
Word signal processor 3 and three-phase inverting circuit 4, the digital signal processor 3 connect brushless straight by rotor-position sensor 2
Stream motor 1, the input connection digital signal processor 3 of the three-phase inverting circuit 4, the output end of three-phase inverting circuit 4 connect
Connect brshless DC motor 1.The digital signal processor 3 connects the input of three-phase inverting circuit 4 by drive circuit 5.Institute
The connecting line stated between three-phase inverting circuit 4 and brshless DC motor 1 connects digital signal processor by current detection circuit 6
3。
The rotor-position sensor 2 is hall position sensor；Six switching tubes of the three-phase inverting circuit 4 are used
Insulated gate bipolar transistor (IGBT)；The model TMS320F2812 of the digital signal processor (DSP), control program
The double-closed-loop control being combined using speed ring and electric current loop, closed loop feedback amount includes rotor-position, the stator phase currents of motor
And current rotating speed.
Reference picture 2, the control method of brshless DC motor of the invention, comprises the following steps：
S1, sets the difference of a speed error value, the i.e. given rotating speed of motor and actual speed as needed；
S2, after electric motor starting, to rotor fixed position to obtain the current location of the rotor of brshless DC motor 1, while passing through
Digital signal processor 3 calculates the current rotating speed of motor；
Whether S3, calculates current speed error and judges it more than setting value according to given rotating speed and current rotating speed,
If judging current speed error more than setting value, motor starts commutation until reaching setting speed；If judging current
Speed error is less than setting value, then turn off all switching tubes on three-phase inverting circuit 4, waits next rotor-position, until
Current speed error is more than setting value.
In step s 2, the current location of brushless DC motor rotor is obtained by hall position sensor.
In step s 2, the current rotating speed of brshless DC motor 1 by digital signal processor 3 according to adjacent rotor twice position
The time interval of confidence number and the number of pole-pairs of motor are calculated and obtained, and computing formula is：
Wherein, T is that brushless DC motor rotor rotates 60 ° of times of electrical angle, and p is motor number of pole-pairs.
Below to comparing explanation using traditional control method and using control method of the invention：
Traditional control method is controlled using the state full-bridge of three-phase six, and rotor often rotates 60 ° of electrical angle stator winding commutation one
Secondary, wherein space mechanism angle is with the relation of electrical angle：Ω=ω × p, p is the number of pole-pairs of motor in formula, it is assumed that motor rises
Dynamic reaching do not change load after setting speed, do not carry out speed governing, motor holding steady-state operation.
If the average voltage of brushless DC motor stator armature winding is：
In formula：t1It is the ON time of IGBT；
t2It is the turn-off time of IGBT；
T is the switch periods of IGBT, T=t1+t2；
UdIt is DC bus-bar voltage；
α is the dutycycle of PWM ripples,
The input power of brshless DC motor body is：P1=UaIa=α UdIa, I in formulaaIt is average for stator armature winding
Phase current.Brshless DC motor is one of current efficiency highest motor, and (this control method will not to ignore the loss of motor body
It is extra to increase motor body loss), then for output power of motor P2, there is P2≈P1, i.e. P2=UaIa=α UdIa。
During using control method of the invention, rotor averagely often rotates (60 × m) ° (wherein m>1) electrical angle, inversion
The break-make of IGBT changes once on circuit, if dutycycle remains as α, commutation number of times is that the break-make number of times of stator winding is changed into former
ComeThe average phase current of stator is changed intoOutput power of motor is
In order to the power output for not changing motor loads the mechanical energy for obtaining, it is necessary to extend the ON time t of IGBT1,
If average on-time extends m times, m is both that the multiple and average commutation dutycycle of the extension of IGBT average on-times are improved
Multiple, then the average commutation dutycycle of PWM ripples be changed intoWherein average commutation dutycycle refers to：To shut-off IGBT,
It is zero in switch periods perseverance then to need PWM ripples, removes the switch periods that these perseverances are zero, takes other with actual commutation effect
Switch periods, the dutycycle of these switch periods is referred to as commutation dutycycle, and the commutation dutycycle of several switch periods is averaged
Value, then be average commutation dutycycle, for convenience of describing, average commutation dutycycle multiple m is referred to as into dutycycle multiple m below.
Traditional control is uniform due to commutation, and PWM ripple dutycycles are constant, and average commutation dutycycle is exactly dutycycle.Average commutation voltage is same
Reason.
Now average commutation voltage is：
In formula：t1' when being using this control method IGBT average on-time；
t2' when being using this control method IGBT the average turn-off time；
The dutycycle of PWM ripples when α ' is using this control method,
The simply average commutation dutycycle that this process is improved, average duty ratio will not change, average voltage it is also constant (i.e. this
Process is not belonging to variable voltage control), so average phase currentKeep constant, equally ignore the loss of motor body, now electricity
Machine power output is：
The size of m is relevant with load and set speed error value, and different loads and speed error setting value have
Different m values, during motor actual motion, DSP can't calculate m values, and this variable is also occurred without in program, when motor speed declines
After speed error is more than setting value, when the average commutation dutycycle of DSP output PWM ripples can be more than using traditional control method
The dutycycle of PWM ripples.When motor keeps steady-state operation, because traditional control method commutation is uniform, the dutycycle of its PWM ripple can be protected
Hold constant；When using control method of the invention, because commutation is uneven, the dutycycle of PWM ripples is in non-uniform change, but
If being calculated according to average commutation electrical angle, the average value of PWM ripple dutycycle multiples is fixed, and its value is m.So will pass through and carry
The mode of the equal commutation dutycycle of PWM popins high compensate for output power of motor loss caused by commutation number of times is reduced.Further, since
IGBT average on-times are constant, therefore will not increase the conduction loss of IGBT.
During using traditional control method controlled motor, rotor often rotates the commutation of 60 ° of electrical angle stator winding once, if
Using control method of the invention, rotor averagely often rotates ω ° of electrical angle commutation once, can subtract switching tube on-off times
It is fewAverage commutation dutycycle improves m times, and average duty ratio is constant, whereinDifferent average rotation electrical angles
ω can have the upper limit of duty cycle adjustment, and higher limit isDutycycle during according to Traditional control has been above higher limit,
This control method cannot be then used, motor will be run according to traditional control method, and otherwise motor can be stalled finally.It is for example every 360 °
Electrical angle commutation 4 times, then averagely often turn over 90 ° of electrical angle commutations once equivalent to rotor, and switching tube on-off times are reduced
Commutation dutycycle improves 1.5 times；Every 360 ° of electrical angle commutations 3 times, then rotor often turn over 120 ° of electrical angle commutations once, switching tube
On-off times reduce half, and commutation dutycycle improves 2 times；Every 720 ° of electrical angle commutations 7 times, then it is average every turn equivalent to rotor
Cross 102.86 ° of electrical angle commutations once, switching tube on-off times are reducedCommutation dutycycle improves 1.7 times.Motor is in reality
Border not necessarily remains steady-state operation when running, and is acted on due to the change for loading and to electric machine speed regulation, average electrical angle ω,
The on-off times of IGBT reductions, PWM ripple dutycycle multiples m, the duty cycle adjustment upper limit can all be continually changing, it is also possible to motor occur
Between this control method and traditional control method constantly switching situation, IGBT reduce thermal losses and extension life-span when
Between would also vary from.
Above-mentioned average electrical angle, average duty ratio are referred respectively to：
Average electrical angle：Actual Brushless DC Motor Position sensor must be installed according to 60 ° of electrical angle intervals, fixed
Sub- winding also must be to turn over 60 ° of positive integer times of electrical angle in rotor just to carry out commutation, be not in rotor during actual motion
Turn over 90 °, the electrical angles such as 102.86 ° carry out the situation of commutation.But situations below occurs：Stator winding continuously turns in rotor
Two for crossing, 60 ° of electrical angle all commutations, the not commutation after the 3rd 60 ° of electrical angles are turned over just stops after that is, every double commutation
Only commutation once, is now equivalent to rotor and averagely often turns over 90 ° of electrical angle commutations once.
Average duty ratio：Still by taking ω=90 ° as an example, according to traditional control method, if dutycycle during its operation is
0.5, the IGBT ON time in each switch periods accounts for 50%, and 3 switch periods are identical；According to control of the invention
Method processed, 3 switch periods become to have switching tube to turn in 2, the first two switch periods makes motor commutation, and its value is
0.75, due to that need not turn on IGBT, PWM ripple dutycycle perseverances are zero to the 3rd switch periods, averagely in 3 switch periods
To average duty ratio, its value is 0.5, and the dutycycle with traditional control method is identical, it is ensured that output power of motor is constant, while
The on-off times of IGBT are reduced to 2 times by 3 times.
For the load not high to rotating speed control accuracy requirement, such as water pump, blower fan etc., as long as defeated in guarantor unit's time
Go out enough water-carrying capacity or air quantity, this requires that the power output of motor disclosure satisfy that the mechanical energy required for loading.This
Class load needs the good speed adjusting performance of brshless DC motor, but need not be very high rotating speed control accuracy and very little torque arteries and veins
It is dynamic, the output effect that motor is not interfered with using control method of the invention is loaded to such, and switching tube can be reduced
Heating loss, increases the service life of inverter, if the cooling system of switching tube breaks down, when using controlling party of the invention
During method, reduced because switching tube generates heat, so reducing its probability for being burnt at once, related personnel can in time have found and close
Control system.
Rotating speed low torque high is loaded, because motor speed is very high, load torque is small, after rotor often rotates 60 ° of electrical angles
Rotating speed decline very little.According to traditional control method, speed error can still make the very small PWM ripples of DSP output duty cycles, to the greatest extent
It is nearly free from power to pipe, and motor does not have extra power consumption substantially, but this needs switching tube of break-make.According to the present invention
Control method, setting one speed error of very little still can reach very high or even script control accuracy, as long as rather than
There is speed error with regard to on-off switch pipe.If the speed error of setting is somewhat larger, controlling party rule is required with to rotary speed precision
Load not high is similar to, and keeps output power of motor constant by way of increasing PWM ripple commutation dutycycles.Such load
PWM duty cycle is smaller, if the somewhat larger speed error of setting, can substantially reduce the heating loss of switching tube, this is
What the property loaded by this class was determined, but speed error still should be decided according to the actual requirements.
Above two kinds of loads is not limited to using the motor institute bringing onto load of control method of the invention, because rotor is every
60 ° of electrical angles of rotation just calculate speed error immediately, if speed error is consistently greater than setting value, control method of the invention is just
Be changed into traditional control method, even if program in DSP is this control method, motor still can with any kind of load, but
Now no longer there is the beneficial effect of control method of the invention.
Control method of the invention is described further with reference to example, electric motor starting reaches setting and turns in this example
Speed governing is not carried out after speed and does not change load and other parameters yet, keep motor steady-state operation.
Brshless DC motor institute bringing onto load is a medium-sized blower fan, and during using traditional control method, rotor often rotates 60 ° of electricity
The commutation of angle stator winding once, if the dutycycle of PWM ripples be 0.75, IGBT and stator winding turn-on sequence it is as shown in Figure 3.
Above-mentioned brshless DC motor is now controlled using control method of the invention, a less speed error is set first
Rotor is averagely rotated electrical angle ω=67.5 °, i.e. rotor and often rotate 1080 ° of electrical angle commutations 16 times, now commutation time
Conducting number of times of the number i.e. per phase stator winding is reducedDutycycle multipleThe equal commutation dutycycle of PWM popins by
0.75 brings up to 0.844 (the average commutation dutycycle upper limit is 0.889), and the power output of motor is constant.If motor starts stable state
AB phases are first turned on after operation, then the turn-on sequence of IGBT and stator winding is as shown in Figure 4.
IGBT and stator winding circulation turn on process analysis：After speed error exceedes setting value, AB is conducted, and motor accelerates
To reduce speed error, in 480 ° of electrical angles that subsequent rotor is continuously turned over, motor is not reaching to setting speed, motor all the time
Stator winding continuous commutation 8 times as traditional control method, next normal commutation position correspondence BC phases are, it is necessary to conducting
IGBT is T2, T3, but during the commutation position of 60 ° of electrical angles arrival BC phases of rotor rotation, motor speed reaches setting speed, now
Shut-off T2, T3, rotor continue to rotate 60 ° of electrical angles, reach the commutation position of BA phases, and now speed error exceedes setting value, need
BA phases are turned on, said process is identical afterwards, in 8 stopping commutation 1 times, such iterative cycles afterwards of continuous commutation.In this process
In, the commutation dutycycle of PWM ripples is non-uniform change, and it will reduce the reduction with speed error, until reach setting turning
After speed, the speed error of next rotor-position is less than setting value, and the vanishing of commutation dutycycle simultaneously stops commutation, but whole switch
The average commutation dutycycle of PWM ripples is definite value 0.844 in cycle, and average duty ratio is 0.75.
Above-mentioned commutation position refers to：After the completion of motor manufacturing, as long as it is fixed with the wiring of control panel, rotor-position with
Correspondence conducting is mutually just to determine that rotor-position shows as hall sensor signal in dsp, and it is six with the relation of switching tube
The binary number of three, corresponds with six rotor-positions.
The present embodiment brshless DC motor belong to the load not high to rotating speed control accuracy requirement with medium-sized fans load,
But because load torque is than larger and setting speed error is smaller, so averagely 67.5 ° of electrical angle of rotation closely tradition control
60 ° of electrical angles of method processed, than relatively limited, dutycycle multiple only has the break-make time of 1.125, IGBT for the raising of PWM ripple dutycycles
Number is original 88.89%, and the IGBT thermal losses for now reducing and the life time of extension are also than relatively limited.Under the rotating speed of load
Drop is bigger, setting speed error is smaller, and rotor averagely rotates electrical angle just closer to 60 °, the beneficial effect of this control method
More substantially, conversely, the rotating speed of load declines, smaller, setting speed error is bigger, and rotor averagely rotates electrical angle and gets over
Greatly, the beneficial effect of this control method is got over can be embodied.
Referring to Fig. 5, control process of the invention is as follows：
Setting speed error amount first；Electric motor starting reaches setting speed, and (starting process must be according to Traditional control side
Method control), after rotor turns over 60 ° of electrical angles on the basis of current location, hall position sensor obtains brushless dc
Whether the position of machine rotor, the current rotating speed and speed error of motor are calculated by DSP, judge speed error more than setting value,
If speed error is more than setting value, motor starts commutation until reaching setting speed；If judging current speed error less than setting
Value, turns off all IGBT, rotor turn over 60 ° of electrical angles or after 60 ° of positive integer times of electrical angle, speed error exceedes setting
Value, the PWM ripples after output duty cycle adjustment, makes motor commutation.During this period, even if speed error is already less than setting value, electricity
Machine still constantly commutation can reach setting value until rotating speed.Such iterative cycles, controlled motor operation.In the process, with negative
The change of load and the speed governing effect (equivalent to setting speed is changed) to motor, dutycycle multiple m also can constantly change.Herein
Period, if m values exceed the adjustable upper limit of dutycycle, traditional control method will be switched to, it is ensured that the operation of motor safety stabilization.
Claims (8)
1. a kind of control system of brshless DC motor, it is characterised in that：Including brshless DC motor (1), rotor position sensing
Device (2), digital signal processor (3) and three-phase inverting circuit (4), the digital signal processor (3) are passed by rotor-position
Sensor (2) connection brshless DC motor (1), input connection digital signal processor (3) of the three-phase inverting circuit (4),
The output end of three-phase inverting circuit (4) connects brshless DC motor (1).
2. a kind of control system of brshless DC motor as claimed in claim 1, it is characterised in that：The Digital Signal Processing
Device (3) connects the input of three-phase inverting circuit (4) by drive circuit (5).
3. a kind of control system of brshless DC motor as claimed in claim 1, it is characterised in that：The three-phase inverting circuit
(4) digital signal processor (3) is connected by current detection circuit (6) with the connecting line between brshless DC motor (1).
4. a kind of control system of brshless DC motor as claimed in claim 1, it is characterised in that：The rotor position sensing
Device (2) is hall position sensor.
5. a kind of control system of brshless DC motor as claimed in claim 1, it is characterised in that：The three-phase inverting circuit
(4) six switching tubes use insulated gate bipolar transistor.
6. a kind of control method of brshless DC motor, it is characterised in that comprise the following steps：
S1, sets the difference of a speed error value, the i.e. given rotating speed of motor and actual speed as needed；
S2, after electric motor starting, to rotor fixed position to obtain the current location of the rotor of brshless DC motor (1), while passing through number
Word signal processor (3) calculates the current rotating speed of motor；
Whether S3, calculates current speed error and judges it more than setting value according to given rotating speed and current rotating speed,
If judging current speed error more than setting value, motor starts commutation until reaching setting speed；If judging current rotating speed
Error is less than setting value, then turn off all switching tubes on three-phase inverting circuit (4), next rotor-position is waited, until working as
Preceding speed error is more than setting value.
7. a kind of control method of brshless DC motor as claimed in claim 6, it is characterised in that：In step s 2, pass through
Hall position sensor obtains the current location of brushless DC motor rotor.
8. a kind of control method of brshless DC motor as claimed in claim 6, it is characterised in that：In step s 2, it is brushless
The current rotating speed of direct current generator (1) by digital signal processor (3) according to the time interval of adjacent rotor-position signal twice and
The number of pole-pairs of motor is calculated and obtained, and computing formula is：
Wherein, T is that brushless DC motor rotor rotates 60 ° of times of electrical angle, and p is motor number of pole-pairs.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109742983A (en) * | 2018-12-24 | 2019-05-10 | 浙江大学 | A kind of motor control method of discontinuous power supply |
| CN111585482A (en) * | 2020-04-22 | 2020-08-25 | 华帝股份有限公司 | Control method of brushless direct current motor |
| CN112019102A (en) * | 2020-09-01 | 2020-12-01 | 安徽理工大学 | Brushless direct current motor rotation speed control device and method |
| CN112994534A (en) * | 2019-12-18 | 2021-06-18 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
| CN113078850A (en) * | 2019-12-18 | 2021-07-06 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109742983A (en) * | 2018-12-24 | 2019-05-10 | 浙江大学 | A kind of motor control method of discontinuous power supply |
| CN112994534A (en) * | 2019-12-18 | 2021-06-18 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
| CN113078850A (en) * | 2019-12-18 | 2021-07-06 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
| CN113078850B (en) * | 2019-12-18 | 2023-04-25 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
| CN112994534B (en) * | 2019-12-18 | 2023-05-26 | 珠海格力电器股份有限公司 | Brushless direct current motor control method and device, brushless direct current motor and electric appliance |
| CN111585482A (en) * | 2020-04-22 | 2020-08-25 | 华帝股份有限公司 | Control method of brushless direct current motor |
| CN112019102A (en) * | 2020-09-01 | 2020-12-01 | 安徽理工大学 | Brushless direct current motor rotation speed control device and method |
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