CN104377999A - Motor control method and device - Google Patents
Motor control method and device Download PDFInfo
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- CN104377999A CN104377999A CN201310351431.8A CN201310351431A CN104377999A CN 104377999 A CN104377999 A CN 104377999A CN 201310351431 A CN201310351431 A CN 201310351431A CN 104377999 A CN104377999 A CN 104377999A
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- motor
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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- Control Of Electric Motors In General (AREA)
Abstract
The invention provides a motor control method. According to an external control signal, a motor is started to rotate from a waiting state. The method comprises the steps that the motor is started according to the duty ratio of the external control signal; whether the external control signal is noise or not is judged, and the motor is switched back to the waiting state if yes; whether the motor starts to rotate or not is judged, and the motor continues to be driven according to the duty ratio of the external control signal; when the external control signal is not noise, a first time frame is exceeded after the motor is started, and the motor does not start to rotate, the motor is switched to be started according to a preset drive signal; after the motor is started according to the preset drive signal, and a second time frame is exceeded, the motor is switched to be driven according to the duty ratio of the external control signal. The invention further provides a corresponding motor control device.
Description
Technical field
The present invention relates to a kind of motor control method, particularly comprise stress release treatment and selectivity and improve signaling burden than a kind of motor control method rotated with starter.The present invention also provides corresponding a kind of controller for motor.
Background technology
With reference to Figure 1A, wherein show a kind of motor control method of prior art, such as, can be applicable to fan motor rotating speed and control, the method carrys out starter (not shown) to reach corresponding rotating speed according to an external control signal Sc.When after the external control signal Sc that circuit receives in pulse-width modulation form, the driving signal Sd of corresponding generation one pulse-width modulation form is to control the rotating speed of motor.With reference to Figure 1A and Figure 1B, static friction must be overcome during owing to rotating from static, therefore pulse width modulation signal must be over a certain duty ratio (duty ratio) X%, motor just can run up (with reference to 0% → 100% curve), but this duty ratio X% is unknown number, with the quality of producing with install, inside soiled condition after using etc. are correlated with, therefore in the prior art, putting T0 from quiescent time to put among the initial time period Ps of T1 to switching time, first provide the high capacity of Y% ratio (such as 30%) to guarantee CD-ROM drive motor to start to rotate, the duty ratio corresponding with external control signal Sc is switched back again after putting T1 to switching time.The shortcoming of this kind of method is: duty ratio Y% is default value, needs during application might not be suited, as too low in setting, motor cannot run up, usually for safety high value can be set as, but when the static friction of motor is less, this just goes back to normal speed after causing and forcing motor to start with high rotating speed, and this high rotating speed is real inessential.In addition, when motor transfixion, if receive the noise (the convex ripple of transient high voltage produced when such as external circuits just starts or external interference etc.) of a similar external control signal Sc, still can cause and make driving signal Sd enter initial time period Ps, with higher load than CD-ROM drive motor, cause motor error starting.
Another prior art (such as U.S. 8,384, No. 325 patents) duty ratio attempting motor is run up is appropriate when closing application static friction, therefore in the prior art, when drive signal start starter rotate from static time, first attempt starter from a low duty ratio (such as 10%), then increase duty ratio gradually until motor runs up and improves motor rotary speed.This kind of technical disadvantages is: computing load than circuit very complicated, in addition, if receive the noise of a similar external control signal, also may cause motor error starting.
Therefore the motor control method of prior art cannot provide accurately control rotating speed, low error starting, with the demand reducing noise jamming etc.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and defect, propose a kind of motor control method and device, can provide accurately control rotating speed, low error starting, with the demand reducing noise jamming etc.
For reaching above-mentioned purpose, with regard to one of them viewpoint, the invention provides a kind of motor control method, according to an external control signal, rotate from wait state to start a motor, the method comprises: start this motor according to the duty ratio of this external control signal; Judge whether this external control signal is noise, then switches back this pending state in this way; Judge whether this motor has started to rotate, then continues in this way to drive this motor according to the duty ratio of this external control signal; When this external control signal non-for noise and this motor of self-starting rise and exceed one first period and this motor and do not start yet to rotate, then switch to change to preset according to one and drive signal to start this motor; And exceeded for one second period after starting this motor with this default driving signal, switch to and drive this motor according to the duty ratio of this external control signal.
In a preferred embodiment, judge that whether this external control signal is that the step of noise comprises: when the duty ratio being bigger than a reference value or this external control signal when the continuous low level time of this external control signal is lower than a critical value, judge that this external control signal is noise.
In a preferred embodiment, this reference value is lower than this first period.
In a preferred embodiment, this critical value is adjustable.
In a preferred embodiment, this duty ratio presetting duty ratio comparatively this external control signal driving signal be height, and this higher load is than being a default value or determining according to the duty ratio of this external control signal.
In a preferred embodiment, this second period be a preset length period or from this motor by this preset drive signal start after to this motor start rotate period.
In a preferred embodiment, judge this motor whether started rotate step for judge this motor whether rotated reach a rotating speed of target, rotate reach one with reference to the number of turns or rotate reach one reference angle.
In a preferred embodiment, this presets the duty ratio driving signal is adjustable.
For reaching above-mentioned purpose, with regard to another viewpoint, the invention provides a kind of controller for motor, according to an external control signal, to drive a motor to rotate from wait state, this controller for motor comprises: a motor drive unit, in order to drive this revolution; One switch unit, driving signal is preset to this motor drive unit in order to switch this external control signal of transmission or, to control the operation of this motor, wherein in accepting this external control signal in one first period, this switch unit transmits this external control signal to this motor drive unit; One control unit, the signal of this motor drive unit is passed in order to control this switch unit, this control unit after accepting to exceed this first period this external control signal and motor does not start to rotate time, produce a force start signal and to switch to change, this default signal that drives is passed to this motor drive unit to this switch unit, this force start signal is passed to after this switch unit exceeded for one second period, stop transmitting this force start signal to this switch unit, to switch to change, this external control signal is passed to this motor drive unit; And an internal signal generation unit, preset drive signal in order to produce this.
In a preferred embodiment, when this control unit judges that this external control signal accepted is a noise, control this switch unit to stop transmitting this external control signal to this motor drive unit.
In a preferred embodiment, be bigger than the duty ratio of a reference value or this external control signal lower than a critical value when the continuous low level time of this external control signal, judge that this external control signal is noise.
In a preferred embodiment, when in this first period, motor has started to rotate, then this switch unit has continued to transmit this external control signal to this motor drive unit.
In a preferred embodiment, this control unit more accepts a revolution signal, according to this revolution signal to judge whether motor has started to rotate.
Illustrate in detail below by specific embodiment, when the effect being easier to understand object of the present invention, technology contents, feature and reach.
Accompanying drawing explanation
Figure 1A, 1B show the motor control method schematic diagram of prior art;
Fig. 2 display is according to the motor control method schematic diagram of a preferred embodiment of the present invention;
Fig. 3 display is according to the signal schematic diagram of the motor control method of a preferred embodiment of the present invention;
Fig. 4 display is according to controller for motor schematic diagram of the present invention.
Symbol description in figure
10 controller for motor
11 motor drive units
12 switch units
13 control units
14 internal signal generation units
S1, S21, S22, S3, S4, S5, S6 step
Sc external control signal
Sd motor drives signal
Sfs force start signal
Sh revolution signal
Sin presets and drives signal
Ps initial time period
P1 first period
P2 second period
T0 point quiescent time
T1 point switching time
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of following cooperation with reference to a graphic preferred embodiment, can clearly present.The direction term mentioned in following examples such as: upper and lower, left and right, front or rear etc., is only the direction with reference to annexed drawings.Graphic in the present invention all belongs to signal, is mainly intended to represent the function relation between each device and each element, as shape, thickness and width then not according to scale.
With reference to Fig. 2,3, wherein show a kind of motor control method and signal schematic diagram that a viewpoint according to the present invention provides, according to an external control signal Sc, rotate from wait state to start a motor (not shown), the method comprises: start this motor (S1) according to the duty ratio of this external control signal Sc; Judge whether this external control signal Sc is noise, then switches back this pending state (S21) in this way; Judge whether this motor has started to rotate, then continues in this way to drive this motor (S22) according to the duty ratio of this external control signal Sc; When this external control signal Sc non-for noise and this motor of self-starting rise and exceed one first period P1 and this motor and do not start yet to rotate (S3), then switch to change to preset according to one and drive signal Sin to start this motor (S4); And exceed one second period P2 (S5) after starting this motor with this default driving signal Sin, switch to and drive this motor (S6) according to the duty ratio of this external control signal Sc.In above method, the order of step S21 and S22 can be exchanged or parallelly to be carried out.
Judge whether external control signal Sc is noise, have various mode feasible.According to a preferred embodiment, judge that whether external control signal Sc is that the step of noise such as can comprise: when the duty ratio being bigger than a reference value (represent for low level and do not work) or external control signal Sc when the continuous low level time of external control signal Sc is lower than a critical value, judge that external control signal Sc is noise.For example, if external control signal Sc is the normal signal for controlling revolution, then high levels all can be had to occur (representing work for high levels) in inevitable each cycle, if in other words of short duration there is high levels after have do not occur high levels again one period of continuous time, can judge that the high levels of this of short duration appearance is noise, therefore the continuous reference value of low level or a critical value for duty ratio can be set, as reference judgment standard.Certainly, this reference value must lower than the time interval of the first period, if exceeded for the first period, the time interval of reference value is long, has now switched to and has driven signal starter according to presetting, determined whether be that noise is late.In addition, duty ratio critical value is that the applied environment of visual motor adjusts, and such as motor operations, when high rotating speed environment, can set higher critical value, when working in slow-speed of revolution environment, can set lower critical value, etc.
Go on to say with reference to Fig. 3, wherein Sc is the external control signal inputted by outside again, and Sin is the inner default driving signal produced, and Sd is the motor driving signal in order to CD-ROM drive motor, and Sfs is force start signal.When receiving external control signal Sc and starting starter, the first period P1 starts; In the first period P1, carry out CD-ROM drive motor (motor drives the duty ratio of signal Sd to correspond to the duty ratio of external control signal Sc) according to the duty ratio of external control signal Sc.Now, motor likely starts to rotate or do not rotate; When the static friction duty ratio that is lower or external control signal Sc of motor is higher, then motor may start to rotate, static friction duty ratio that is higher or external control signal Sc again when motor is lower, then motor still may be in wait state (transfixion).If motor has started to rotate, then can skip the second period P2 and directly entered normal operation, having jumped to step S6 corresponding in Fig. 2 by step S22.When motor does not rotate and at the end of the first period P1, then produce force start signal Sfs(and force start signal Sfs and change working position standard into, work is represented for high levels) in figure, and the duty ratio transferring basis default driving signal Sin to carrys out CD-ROM drive motor (duty ratio of motor driving signal Sd corresponds to the duty ratio of default driving signal Sin), duty ratio of this default driving signal Sin can be a fixed value preset or is adjustable value.Preset and drive signal Sin from accepting to start synchronous generation (as diagram) external control signal Sc, also can start to produce (not shown) from generation force start signal Sfs.In the second period P2, motor should start to rotate, therefore after the second period P2 terminates, it be according to external control signal Sc continuation CD-ROM drive motor that motor drives signal Sd changeable.If in the first period P1 or the second period P2, motor has started to rotate, then force start signal Sfs also can synchronously stop (changing not working position into accurate, represent do not work in figure for low level), and be not limited to graphic shown in signal corresponding relation.
" motor drives the duty ratio of signal Sd to correspond to the duty ratio of external control signal Sc " described in above content and " motor drives the duty ratio of signal Sd to correspond to the duty ratio preset and drive signal Sin ", is not limited to " motor drives the duty ratio of signal Sd to be strictly equal to the duty ratio of external control signal Sc " or " motor drives the duty ratio of signal Sd to be strictly equal to the duty ratio preset and drive signal Sin "; If needed, motor drives signal Sd according to external control signal Sc or can preset driving signal Sin, and the transformational relation preset with produces.
In one preferred embodiment, the second period P2 can be a preset length period or when motor from wait state change to rotary state time, the second period P2 terminates.
Wherein, the basis for estimation that motor has rotated can be revolution and reaches a rotating speed of target, revolution and reached one and rotated one with reference to angle etc. with reference to the number of turns or motor.Rotating speed of target, with reference to the number of turns, with reference to the setting of angle, its object is for confirming that motor is a stable rotation, and avoid such as rotating instantaneously or vibration etc. causes erroneous judgement.
In one preferred embodiment, external control signal Sc, default signal Sin, the motor of driving drive signal Sd to be all pulse width modulation signal, are not limited in this, if also can be other signal form as required when so implementing.
According to another viewpoint, with reference to Fig. 4, wherein show a kind of controller for motor 10, rotate from wait state to drive a motor.Controller for motor 10 comprises: motor drive unit 11, rotates with CD-ROM drive motor in order to start; Switch unit 12, the default signal Sin that drives of external control signal Sc or is transmitted to motor drive unit 11 in order to switch, to control the operation of motor, wherein in accepting this external control signal Sc in one first period, this switch unit 12 transmits this external control signal Sc to this motor drive unit 11; Control unit 13, after accepting to exceed this first period external control signal Sc and motor does not start to rotate time, produce a force start signal Sfs to switch unit 12, to switch to change, default driving signal Sin is passed to motor drive unit 11, and after exceeding for one second period with default driving signal Sin operation, stop transmitting force start signal Sfs to switch unit 12, to switch to change, external control signal Sc is passed to motor drive unit 11, or according to the revolution signal Sh accepted, stop transmitting force start signal Sfs to switch unit 12; And internal signal generation unit 14, drive signal Sin in order to produce to preset, such as, can produce according to external control signal Sc or force start signal Sfs.Therefore, motor drives signal Sd in the first period, correspond to the duty ratio of external control signal Sc, and corresponds to the duty ratio preset and drive signal Sin in the second period, switches to the duty ratio corresponding to external control signal Sc after the second period terminated.Again, as in the first period motor started rotate (such as can judge according to revolution signal Sh, and can judge whether revolution reaches a rotating speed of target, whether revolution has reached a reference number of turns or whether motor has rotated one with reference to angle etc.), then can omit for the second period and not need to operate with default driving signal Sin, and switch unit 12 can continue to transmit this external control signal Sc to this motor drive unit 11.
In one preferred embodiment, when accepted external control signal Sc is judged as noise, control unit 13 controls switch unit 12 to stop transmitting external control signal Sc to motor.Judge that the mode of noise can consult the related description in preceding method embodiment.
In addition, if necessary, switch unit 12 also can switch according to accepted revolution signal Sh and continue CD-ROM drive motor by external control signal Sc, but not is switched by control unit 13.Can utilize and interdict the sensing that sensor carries out motor rotary speed, to produce motor rotary speed signal Sh to controller for motor 10 by Hall element or light.
The correlation technique content of controller for motor 10 can refer to aforementioned preferred embodiment content and explanation, is not repeated herein.
Below for preferred embodiment, the present invention is described, just the above, be only and make those skilled in the art be easy to understand content of the present invention, be not used for limiting interest field of the present invention.For those skilled in the art, when in spirit of the present invention, can thinking immediately and various equivalence change.Therefore allly change according to concept of the present invention with spirit institute is impartial for it or modifies, all should be included in claim of the present invention.Such as, each circuit that embodiment icon directly connects or element, can plant therebetween other circuit or element of not affecting major function; The accurate meaning of high-low-position of signal is interchangeable, etc.Any embodiment of the present invention or claim must not reach whole object disclosed by the present invention or advantage or feature.Summary part and title are only used to the use of auxiliary patent document search, are not used for limiting interest field of the present invention.
Claims (13)
1. a motor control method, according to an external control signal, rotate from wait state to start a motor, it is characterized in that, this motor control method comprises:
This motor is started according to the duty ratio of this external control signal;
Judge whether this external control signal is noise, then switches back this pending state in this way;
Judge whether this motor has started to rotate, then continues in this way to drive this motor according to the duty ratio of this external control signal;
When this external control signal non-for noise and this motor of self-starting rise and exceed one first period and this motor and do not start yet to rotate, then switch to change to preset according to one and drive signal to start this motor; And
Exceeded for one second period after starting this motor with this default driving signal, switch to and drive this motor according to the duty ratio of this external control signal, wherein this second period is after this first period.
2. motor control method as claimed in claim 1, wherein, judge that whether this external control signal is that the step of noise comprises: when the duty ratio being bigger than a reference value or this external control signal when the continuous low level time of this external control signal is lower than a critical value, judge that this external control signal is noise.
3. motor control method as claimed in claim 2, wherein, this reference value is lower than this first period.
4. motor control method as claimed in claim 3, wherein, this critical value is adjustable.
5. motor control method as claimed in claim 1, wherein, this presets the duty ratio driving the duty ratio of signal comparatively this external control signal be height, and this higher load is than being a default value or determining according to the duty ratio of this external control signal.
6. motor control method as claimed in claim 1, wherein, this second period is a preset length period or the period starting rotation after this motor presets the startup of driving signal by this to this motor.
7. motor control method as claimed in claim 1, wherein, judges that step that whether this motor started to rotate reaches a rotating speed of target for judging whether this motor has rotated, rotates and reach one with reference to the number of turns or rotate and reach a reference angle.
8. motor control method as claimed in claim 1, wherein, this presets the duty ratio driving signal is adjustable.
9. a controller for motor, according to an external control signal, to drive a motor to rotate from wait state, it is characterized in that, this controller for motor comprises:
One motor drive unit, in order to drive this revolution;
One switch unit, driving signal is preset to this motor drive unit in order to switch this external control signal of transmission or, to control the operation of this motor, wherein in accepting this external control signal in one first period, this switch unit transmits this external control signal to this motor drive unit;
One control unit, the signal of this motor drive unit is passed in order to control this switch unit, this control unit after accepting to exceed this first period this external control signal and motor does not start to rotate time, produce a force start signal and to switch to change, this default signal that drives is passed to this motor drive unit to this switch unit, this force start signal is passed to after this switch unit exceeded for one second period, stop transmitting this force start signal to this switch unit, to switch to change, this external control signal is passed to this motor drive unit; And
One internal signal generation unit, presets driving signal in order to produce this.
10. controller for motor as claimed in claim 9, wherein, when this control unit judges that this external control signal accepted is a noise, controls this switch unit to stop transmitting this external control signal to this motor drive unit.
11. controller for motor as claimed in claim 10, wherein, are bigger than the duty ratio of a reference value or this external control signal lower than a critical value when the continuous low level time of this external control signal, judge that this external control signal is noise.
12. controller for motor as claimed in claim 9, wherein, when in this first period, motor has started to rotate, then this switch unit has continued to transmit this external control signal to this motor drive unit.
13. controller for motor as claimed in claim 12, wherein, this control unit more accepts a revolution signal, according to this revolution signal to judge whether motor has started to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310351431.8A CN104377999A (en) | 2013-08-13 | 2013-08-13 | Motor control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310351431.8A CN104377999A (en) | 2013-08-13 | 2013-08-13 | Motor control method and device |
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| Publication Number | Publication Date |
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| CN104377999A true CN104377999A (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310351431.8A Pending CN104377999A (en) | 2013-08-13 | 2013-08-13 | Motor control method and device |
Country Status (1)
| Country | Link |
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| CN (1) | CN104377999A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107547012A (en) * | 2016-06-28 | 2018-01-05 | 建准电机工业股份有限公司 | Motor, starting control method thereof and fan with motor |
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| JP2002252996A (en) * | 2001-02-26 | 2002-09-06 | Hitachi Ltd | Method and apparatus for controlling start of synchronous motor |
| US20110219816A1 (en) * | 2008-12-02 | 2011-09-15 | Panasonic Corporation | Motor drive device, and compressor and refrigerator using same |
| CN101807873A (en) * | 2009-02-17 | 2010-08-18 | 罗姆股份有限公司 | The drive circuit of motor, driving method and cooling device |
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Application publication date: 20150225 |