CN104113242B - The startup method of the DC fan of position-sensor-free and DC fan controller - Google Patents
The startup method of the DC fan of position-sensor-free and DC fan controller Download PDFInfo
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- CN104113242B CN104113242B CN201310241871.8A CN201310241871A CN104113242B CN 104113242 B CN104113242 B CN 104113242B CN 201310241871 A CN201310241871 A CN 201310241871A CN 104113242 B CN104113242 B CN 104113242B
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Abstract
The present invention is applicable to household electrical appliance technical field, provide the startup method of the DC fan of a kind of position-sensor-free, described method includes: after DC fan starts, the most covert time T1 of record current maximum, the covert time T2 of record current maximum second time mutually and the most covert order of electric current maximum；Turning to of this DC fan is known according to this electric current maximum phase transformation phase sequence；Calculate the rotating speed absolute value of DC fan；The start-up mode of this DC fan is determined with described rotating speed absolute value according to turning to of described DC fan.The technical scheme that the present invention provides has and is independent of DC fan variable element, calculates accurately, the advantage that amount of calculation is little.
Description
Technical field
The invention belongs to field of household appliances, particularly relate to startup method and the direct current of the DC fan of a kind of position-sensor-free
Controller of fan.
Background technology
DC fan (i.e. permanent magnet synchronous direct flow fan), compared with AC blower fan (i.e. sensing DC fan), has without logical
Crossing faradic current excitation, efficiency is higher, the advantage of good energy saving performance.At present, DC fan usage amount is continuously increased, especially at energy
Effect requires higher field of household appliances (such as: convertible frequency air-conditioner) than with level of noise, and DC fan has obtained being widely applied very much.According to driving
The difference of flowing mode, DC fan is divided into again square wave drive and sine wave drive two kinds, compared with square wave drive mode, sinusoidal wave
Type of drive has the advantages such as noise is low, pulsation of current is little, and the DC fan of sine wave drive is increasingly becoming the main flow in market.
Sine wave drive DC fan mainly uses the method for vector controlled to be controlled at present, and it is high that the method has efficiency
And the advantage that phase current harmonic wave is less.But carry out coordinate transform, vector controlled owing to using said method to need according to angle
Need to obtain the rotor-position of DC fan in running.According to the difference of rotor-position detection mode, DC fan vector
The mode controlled can be divided into two kinds: one is to utilize the position sensor such as encoder, Hall to detect rotor-position, and according to
This selects the mode of vector controlled；Another kind is without position sensor, and according to DC fan electric current, voltage estimation rotor
Position.Latter approach is commonly called sensorless strategy.Due to the advantage on cost, the DC fan of sensorless strategy
Increasingly paid attention to by domestic and international electronic product producer, so, the DC fan of position-sensor-free sine wave drive has
The advantages such as efficiency height, low, the low cost of noise, its application is more and more extensive.
At present, the DC fan of major part sensorless strategy uses position based on back-emf or magnetic flux predictor method,
These methods are required to DC fan certain rotating speed, just can provide location estimation accurately, if DC fan rotating speed is zero
Or close to zero, then the back-emf detected or the signal to noise ratio of magnetic flux will be the lowest so that position is difficult to accurately estimate.To this end, one
As sensorless strategy DC fan be required for the process of an open-loop start-up, by adding the d-q shaft current preset straight
Flow fan rotor drives and reaches certain initial velocity, then cutting speed closed loop control by force.And at DC fan open-loop start-up
Before must carry out rotor fixed position process, i.e. DC fan three-phase is passed to unidirectional current, makes rotor fix, for driving the straight of wind wheel
Flow fan usually needs to start in the environment of against the wind or with the wind.When location, being acted on by external wind, blower fan has
Certain initial speed, rotor is often difficult to fix, if rotor cannot be fixed, then the easy step-out of open-loop start-up process, thus lead
Cause to start unsuccessfully.
For solving the problems referred to above, patent 1(publication number: US7652441B2) propose to go out according to DC fan flux estimator
Blower fan initial speed, then judges to enter different action patterns according to different rotating speeds.The method is by controlling blower fan phase current
It is zero so that blower fan input voltage approaches its back-emf, and back-emf carries out approximate integration acquisition magnetic flux, further according to flux value
Try to achieve rotation speed of fan, so can obtain accurate velocity estimation, ensure that again phase current magnitude will not be excessive.But,
In this patent, the method for estimation of blower fan initial speed has dependency to DC fan variable element (such as magnetic flux), so its meter
Do not calculate accurately really, and amount of calculation is bigger.
Summary of the invention
The purpose of the embodiment of the present invention is to provide the startup method of the DC fan of a kind of position-sensor-free, it is intended to solve
Certainly the calculating of prior art relies on DC fan variable element, calculates inaccurate, computationally intensive problem.
First aspect provides the startup method of the DC fan of a kind of position-sensor-free, and described method includes:
After DC fan starts, the most covert time T1 of record current maximum, record current maximum second time mutually
Covert time T2 and the most covert order of electric current maximum；
Turning to of this DC fan is known according to this electric current maximum phase transformation phase sequence；
The rotating speed absolute value of DC fan is calculated according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time,
The T2 electric current maximum second time mutually covert time；
The start-up mode of this DC fan is determined with described rotating speed absolute value according to turning to of described DC fan.
In conjunction with the startup method of DC fan of a kind of position-sensor-free that first aspect provides, in the of first aspect
In a kind of alternative, described know that turning to of this DC fan specifically includes according to this electric current maximum phase transformation phase sequence:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan；
The three-phase of described DC fan is respectively as follows: U phase, V phase and W phase.
In conjunction with a kind of startup method of DC fan of position-sensor-free of first aspect or combine the of first aspect
A kind of alternative, in the second alternative of second aspect, described absolute with rotating speed according to turning to of this DC fan
Value determines that the start-up mode of this DC fan specifically includes:
If initial speed ω0Meet ωnl＜ ω0＜ ωpl, then DC fan is positioned and open-loop start-up, with rear cutout
Enter operation with closed ring；
If initial speed is at ω0Meet ωpl＜ ω0＜ ωpmOr ωnm＜ ω0＜ ωnl, then keep DC fan energy consumption
The braking Tb second, then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring；
If initial speed ω0Meet ωpm＜ ω0＜ ωphOr ωnh＜ ω0＜ ωnm, then keep DC fan energy consumption system
After the dynamic Tb second, DC fan is forced the input current braking Tfb second, then DC fan is positioned and open-loop start-up, with
Rear incision operation with closed ring.
If initial speed ω0Meet ω0＞ ωphOr ω0＜ ωnh, then judge that blower fan initial speed is excessive, it is not necessary to start；
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith
ωnhIt is respectively the threshold value of the reverse basic, normal, high rotating speed of DC fan；
Wherein, ω0For initial speed.
Second aspect, it is provided that a kind of DC fan controller, described controller includes:
Logging modle, after starting when DC fan, record current maximum the most covert time T1, record current
The maximum covert time T2 of second time mutually and the most covert order of electric current maximum；
Steering module, for knowing turning to of this DC fan according to this electric current maximum phase transformation phase sequence；
Rotating speed module, for calculating the rotating speed absolute value of DC fan according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time,
The T2 electric current maximum second time mutually covert time；
Start module, for determining opening of this DC fan according to turning to of described DC fan with described rotating speed absolute value
Dynamic model formula.
A kind of DC fan controller provided in conjunction with second aspect, in the first alternative of second aspect, institute
State steering module specifically for:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan；
The three-phase of described DC fan is respectively as follows: U phase, V phase and W phase.
In a kind of DC fan controller provided in conjunction with first aspect or the first alternative of first aspect, the
In the second alternative of two aspects, described startup module specifically for:
If initial speed ω0Meet ωnl＜ ω0＜ ωpl, then DC fan is positioned and open-loop start-up, with rear cutout
Enter operation with closed ring；
If initial speed is at ω0Meet ωpl＜ ω0＜ ωpmOr ωnm＜ ω0＜ ωnl, then keep DC fan energy consumption
The braking Tb second, then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring；
If initial speed ω0Meet ωpm＜ ω0＜ ωphOr ωnh＜ ω0＜ ωnm, then keep DC fan energy consumption system
After the dynamic Tb second, DC fan is forced the input current braking Tfb second, then DC fan is positioned and open-loop start-up, with
Rear incision operation with closed ring.
If initial speed ω0Meet ω0＞ ωphOr ω0＜ ωnh, then judge that blower fan initial speed is excessive, it is not necessary to start；
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith
ωnhIt is respectively the threshold value of the reverse basic, normal, high rotating speed of DC fan；
Wherein, ω0For initial speed.
The embodiment of the present invention compared with prior art, has the beneficial effects that: technical scheme have be independent of straight
Flow fan variable element, calculates accurately, the advantage that amount of calculation is little.
Accompanying drawing explanation
Fig. 1 is a kind of position-sensor-free sine wave drive DC fan control system frame that the embodiment of the present invention provides
Figure；
Fig. 2 is the flow chart of the startup method of the DC fan of a kind of position-sensor-free that the embodiment of the present invention provides；
Fig. 3 is current three-phase U phase, V phase, the current diagram of W phase；
The interval division schematic diagram that Fig. 4 provides for the specific embodiment of the invention；
The relation curve signal forcing electric current in input current braking procedure, rotating speed and time that Fig. 5 provides for the present invention
Figure；
Fig. 6 initial speed meets ωnh＜ ω0＜ ωnmThe phase current waveform figure that DC fan starts；
The startup method of the DC fan of a kind of position-sensor-free that Fig. 7 provides for the present invention implements flow chart；
The structure chart of a kind of DC fan controller that Fig. 8 provides for the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
The specific embodiment of the invention provides the startup method of the DC fan of a kind of position-sensor-free, and the method is by directly
Flow fan control system performs, position-sensor-free sine wave drive DC fan control system block diagram such as Fig. 1 institute of the method
Show, as it is shown in figure 1, the hardware of DC fan control system is not modified by the technical scheme that the present invention provides；The party
Method is as in figure 2 it is shown, include:
201, after DC fan starts, record current maximum mutually for the first time covert time T1, record current maximum mutually the
Secondary covert time T2 and the most covert order of electric current maximum；
202, turning to of this DC fan is known according to this electric current maximum phase transformation phase sequence；
203, the rotating speed absolute value of DC fan is calculated according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time,
The T2 electric current maximum second time mutually covert time；
204, the start-up mode of this DC fan is determined according to turning to of this DC fan with rotating speed absolute value.
Rely on when the method that the present invention provides calculates rotating speed is the number of pole-pairs of motor, and number of pole-pairs is come for direct current generator
Say and belong to intrinsic parameter, so without relying on the variable element of motor when it calculates, so it has calculates advantage accurately, separately
Outward, the mode of above-mentioned calculating is simple, has the simple advantage of calculating.
Optionally, above-mentioned 202 methods realized are specifically as follows:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan.
Wherein U phase, V phase, W phase current diagram as it is shown on figure 3, it should be noted that the solid line in Fig. 3 is that U phase is electric
Stream, dotted line is V phase current, and chain-dotted line is W phase current, and U phase, V phase, W phase differ hexagonal angle between any two.
Illustrate which kind of situation is that electric current maximum is mutually covert below in conjunction with Fig. 3.
When blower fan starts to start, first initialize the intervalometer T1 for electric current maximum transition count the most for the first time and electric current
The intervalometer T2 of the maximum transition count of second time mutually, makes T1=T2=0s, then, makes DC fan enter dynamic braking state, i.e.
The three-phase voltage of DC fan is zero；Subsequently, DC fan will generate electricity due to initial speed, and produces at UVW three-phase
The alternating current that phase place mutual deviation is 120 degree, elapses over time, and the electric current maximum phase sequence ground in UVW three-phase substitutes, record
The moment T1(of lower electric current maximum conversion the most for the first time is as it is shown on figure 3, between T1, maximum current is V phase mutually, after T1, maximum
Electric current is U phase mutually, and change now is just called electric current maximum phase inversion) with the moment T2 of electric current maximum mutually second time conversion.Root
Direction (the concrete determination methods of DC fan initial speed is i.e. may determine that according to the first time order change of electric current maximum phase
May refer to the description of above-mentioned 202)；Turning to of value according to T1, T2 and DC fan, can calculate blower fan and initially turn
Speed ω 0.For different DC fan initial speed ω 0, by entering different action patterns, (concrete mode of entrance can be joined
See below the description of 204).
Optionally, it is achieved the method for 204 is specifically as follows:
If initial speed ω0Within interval 0, i.e. ωnl＜ ω0＜ ωpl, then DC fan is positioned and open loop is opened
Dynamic, it is then cut into operation with closed ring；
If initial speed is at ω0Within interval 1, i.e. ωpl＜ ω0＜ ωpmOr ωnm＜ ω0＜ ωnl, then keep direct current
The fan energy consumption braking Tb second, then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring.
If initial speed ω0Within interval 2, i.e. ωpm＜ ω0＜ ωphOr ωnh＜ ω0＜ ωnm, then keep direct current
After the fan energy consumption braking Tb second, DC fan is forced the input current braking Tfb second, then DC fan is positioned and open
Ring starts, and is then cut into operation with closed ring.
If initial speed ω0Within interval 3, i.e. ω0＞ ωphOr ω0＜ ωnh, then judge that blower fan initial speed is excessive,
Without starting.Then, stopping PWM output, after waiting the Tw second, return starts.
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith
ωnhIt is respectively the threshold value of the reverse basic, normal, high rotating speed of DC fan.
Wherein, ω0For initial speed.The division in above-mentioned interval may refer to shown in Fig. 4.
As it is shown in figure 5, Fig. 5 gives forces the relation curve of electric current, rotating speed and time in input current braking procedure.By
Scheme visible, force input current braking procedure can be divided into 4 stages, carry out initial speed at blower fan and estimate and the dynamic braking Tb second
Afterwards, the state 0 forcing input current to be braked is entered.In state 0, first making current phasor rotating speed is zero, and makes Id gradually
Being incremented to setting value Id*, then current phasor rotating speed is gradually incremented by 0 by ω 0, and Iq remains zero.State 1 realizes determining of blower fan
Position.In state 1, current phasor rotating speed is 0, and Id remains Id*, and Iq remains zero.State 2 realizes the open loop of blower fan and opens
Dynamic.In state 2, current phasor rotating speed is incremented to ω op, Id by 0 and remains Id*, and Iq remains zero.In state 3, wind
Machine incision operation with closed ring.
Fig. 6 is that initial speed meets ωnh＜ ω0＜ ωnmThe phase current waveform that DC fan starts.This waveform and Fig. 5 institute
That shows forces electric current, rotating speed in input current braking procedure corresponding with the relation curve of time.
The startup method of the DC fan of a kind of position-sensor-free that Fig. 7 provides for the specific embodiment of the invention is concrete
Flow chart.
The specific embodiment of the invention provides a kind of DC fan controller 800, and this controller 800 as shown in Figure 8, wraps
Include:
Logging modle 801, after starting when DC fan, record current maximum the most covert time T1, record
The covert time T2 of electric current maximum second time mutually and the most covert order of electric current maximum；
Steering module 802, for knowing turning to of this DC fan according to this electric current maximum phase transformation phase sequence；
Rotating speed module 803, for calculating the rotating speed absolute value of DC fan according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time,
The T2 electric current maximum second time mutually covert time；
Start module 804, for determining this DC fan according to turning to of described DC fan with described rotating speed absolute value
Start-up mode.
Optionally, steering module 802 specifically for:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan；
The three-phase of described DC fan is respectively as follows: U phase, V phase and W phase.
Optionally, start module 804 specifically for:
If initial speed ω0Meet ωnl＜ ω0＜ ωpl, then DC fan is positioned and open-loop start-up, with rear cutout
Enter operation with closed ring；
If initial speed is at ω0Meet ωpl＜ ω0＜ ωpmOr ωnm＜ ω0＜ ωnl, then keep DC fan energy consumption
The braking Tb second, then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring；
If initial speed ω0Meet ωpm＜ ω0＜ ωphOr ωnh＜ ω0＜ ωnm, then keep DC fan energy consumption system
After the dynamic Tb second, DC fan is forced the input current braking Tfb second, then DC fan is positioned and open-loop start-up, with
Rear incision operation with closed ring.
If initial speed ω0Meet ω0＞ ωphOr ω0＜ ωnh, then judge that blower fan initial speed is excessive, it is not necessary to start；
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith
ωnhIt is respectively the threshold value of the reverse basic, normal, high rotating speed of DC fan；
Wherein, ω0For initial speed.
What the DC fan controller that the present invention provides relied on when calculating rotating speed is the number of pole-pairs of motor, and number of pole-pairs pair
Intrinsic parameter is belonged to for direct current generator, so without relying on the variable element of motor when it calculates, so it has calculating standard
True advantage, it addition, the mode of above-mentioned calculating is simple, has the simple advantage of calculating.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (2)
1. the startup method of the DC fan of a position-sensor-free, it is characterised in that described method includes:
After DC fan starts, the most covert time T1 of record current maximum, record current maximum second time mutually are covert
Time T2 and the most covert order of electric current maximum；
Turning to of this DC fan is known according to this electric current maximum phase transformation phase sequence；
The rotating speed absolute value of DC fan is calculated according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time, T2 electricity
The stream maximum second time mutually covert time；
The start-up mode of this DC fan is determined with described rotating speed absolute value according to turning to of described DC fan；
Described know that turning to of this DC fan specifically includes according to this electric current maximum phase transformation phase sequence:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan；
The three-phase of described DC fan is respectively as follows: U phase, V phase and W phase；
Described determine that the start-up mode of this DC fan specifically includes according to turning to of this DC fan with rotating speed absolute value:
If initial speed ω0Meet ωnl<ω0<ωpl, then DC fan is positioned and open-loop start-up, is then cut into closed loop
Run；
If initial speed is at ω0Meet ωpl<ω0<ωpmOr ωnm<ω0<ωnl, then keep the DC fan dynamic braking Tb second,
Then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring；
If initial speed ω0Meet ωpm<ω0<ωphOr ωnh<ω0<ωnm, then after keeping the DC fan dynamic braking Tb second,
DC fan is forced the input current braking Tfb second, then DC fan is positioned and open-loop start-up, be then cut into closed loop
Run；
If initial speed ω0Meet ω0>ωphOr ω0<ωnh, then judge that blower fan initial speed is excessive, it is not necessary to start；
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith ωnhPoint
Wei the threshold value of the reverse basic, normal, high rotating speed of DC fan；
Wherein, ω0For initial speed.
2. a DC fan controller, it is characterised in that described controller includes:
Logging modle, after starting when DC fan, record current maximum mutually for the first time covert time T1, record current are
The big covert time T2 of second time mutually and the most covert order of electric current maximum；
Steering module, for knowing turning to of this DC fan according to this electric current maximum phase transformation phase sequence；
Rotating speed module, for calculating the rotating speed absolute value of DC fan according to formula 1；
Wherein, M0For rotating speed absolute value, P is the number of pole-pairs of DC fan, and T1 is the electric current maximum the most covert time, T2 electricity
The stream maximum second time mutually covert time；
Start module, for determining the startup mould of this DC fan according to turning to of described DC fan with described rotating speed absolute value
Formula；
Described steering module specifically for:
Order as the most covert in electric current maximum is to become V phase from U phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become W phase from U phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become W phase from V phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become U phase from V phase, it is determined that turning to as reversely of DC fan；
Order as the most covert in electric current maximum is to become U phase from W phase, it is determined that turning to as forward of DC fan；
Order as the most covert in electric current maximum is: become V phase from W phase, it is determined that turning to as reversely of DC fan；
The three-phase of described DC fan is respectively as follows: U phase, V phase and W phase；
Described startup module specifically for:
If initial speed ω0Meet ωnl<ω0<ωpl, then DC fan is positioned and open-loop start-up, is then cut into closed loop
Run；
If initial speed is at ω0Meet ωpl<ω0<ωpmOr ωnm<ω0<ωnl, then keep the DC fan dynamic braking Tb second,
Then DC fan is positioned and open-loop start-up, be then cut into operation with closed ring；
If initial speed ω0Meet ωpm<ω0<ωphOr ωnh<ω0<ωnm, then after keeping the DC fan dynamic braking Tb second,
DC fan is forced the input current braking Tfb second, then DC fan is positioned and open-loop start-up, be then cut into closed loop
Run；
If initial speed ω0Meet ω0>ωphOr ω0<ωnh, then judge that blower fan initial speed is excessive, it is not necessary to start；
Wherein, ωpl、ωpmWith ωphIt is respectively the threshold value of the basic, normal, high rotating speed of DC fan forward；And ωnl、ωnmWith ωnhPoint
Wei the threshold value of the reverse basic, normal, high rotating speed of DC fan；
Wherein, ω0For initial speed.
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| CN201310241871.8A CN104113242B (en) | 2013-06-18 | 2013-06-18 | The startup method of the DC fan of position-sensor-free and DC fan controller |
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|---|---|---|---|---|
| CN104481907B (en) * | 2014-12-05 | 2017-02-08 | 广东美的制冷设备有限公司 | Starting and controlling method and device for direct-current fan |
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