CN104796052A - Hall-free electric machine starting method and device - Google Patents
Hall-free electric machine starting method and device Download PDFInfo
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- CN104796052A CN104796052A CN201510213363.8A CN201510213363A CN104796052A CN 104796052 A CN104796052 A CN 104796052A CN 201510213363 A CN201510213363 A CN 201510213363A CN 104796052 A CN104796052 A CN 104796052A
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- phase
- phase place
- current differential
- rotor
- electric machine
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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
- H02P6/20—Arrangements for starting
Abstract
An embodiment of the invention provides a Hall-free electric machine starting method and device, relates to the field of electric machines and solves the problem of overcurrent caused by the fact that the existing rotor positioning method is in need of large current injection. The method includes: applying single-pulse voltage to two of three phases of an electric machine sequentially according to six-step energization, and collecting current difference of single pulse flowing into and flowing out of the two phases each time to obtain a group of current differences, wherein the group of current differences includes current differences corresponding to six phase states in six-step energization, and electric machine start time of the single-phase voltage is less than an electric machine time constant; repeating the six-step energization process, continuing collecting at least one group of current differences; selecting any two groups of current differences; matching the any two groups of current differences with conditions needing to be satisfied when the electric machine rotor is at six equilibrium positions respectively, and determining the position of the electric machine rotor; starting the electric machine according to the position of the electric machine rotor.
Description
Technical field
The present invention relates to machine field, particularly relate to a kind of starting method without hall electric machine and device.
Background technology
At present; without brshless DC motor (the Brushless Direct CurrentMotor of Hall element; be called for short BLDCM) when starting; usually can adopt and force localization method to obtain the particular location of rotor; namely in BLDCM, very large impulse current is injected at short notice; by armature field and rotor permanent magnet field interactions, rotor is forced to forward a certain ad-hoc location to.
But first the method for the impulse current that this injection is very large can be subject to BLDCM and hold quantitative limitation.Concrete, if BLDCM capacity is excessive, then can increase motor cost; If BLDCM capacity is too small, the electric current that BLDCM then can be caused to inject is large not, and then cause the location failure of rotor, now, if force in order to successful positioning motor rotor-position to introduce big current, then can cause overcurrent (i.e. electric motor short circuit, disconnected phase, overload etc.), even cause because of overcurrent the control board of motor burn out or catch fire.
Summary of the invention
A kind of starting method without hall electric machine that embodiments of the invention provide and device, solve the flow problem excessively that existing rotor fixed position method causes owing to needing to inject big current.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, provides a kind of starting method without hall electric machine, comprising:
Pulse voltage is applied to the two-phase in the three-phase of motor successively according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out described two-phase, obtain one group of current differential, described one group of current differential comprises the current differential that in described six step energisings, six kinds of phase states are corresponding respectively; Wherein, the motor starting time that described pulse voltage is corresponding is less than time constant of electric motors;
Repeat above-mentioned six step galvanizations, continue to gather at least one group of current differential;
Choose any two groups of current differential, and obtain the condition of demand fulfillment when described rotor is in six kinds of equilbrium positions respectively;
The condition described any two groups of current differential and described rotor being in respectively demand fulfillment during six kinds of equilbrium positions is mated, and determines the position of described rotor;
Described motor is started according to the position of described rotor.
Second aspect, provides a kind of starting drive without hall electric machine, it is characterized in that, comprising:
Collecting unit, for applying pulse voltage to the two-phase in the three-phase of motor successively according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out described two-phase, obtain one group of current differential, described one group of current differential comprises the current differential that in described six step energisings, six kinds of phase states are corresponding respectively; Wherein, the motor starting time that described pulse voltage is corresponding is less than time constant of electric motors;
Described collecting unit, also for repeating above-mentioned six step galvanizations, continues to gather at least one group of current differential;
Acquiring unit, for choosing any two groups of current differential that described collecting unit collects, and obtains the condition of demand fulfillment when described rotor is in six kinds of equilbrium positions respectively;
Determining unit, when described any two groups of current differential and described rotor for being got by described acquiring unit are in six kinds of equilbrium positions respectively, the condition of demand fulfillment is mated, and determines the position of described rotor;
Start unit, the position for the described rotor determined according to described determining unit starts described motor.
The starting method without hall electric machine that embodiments of the invention provide and device, pulse voltage is applied to the two-phase in the three-phase of motor according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out two-phase, obtain one group of current differential, this group current differential comprises the current differential that in six step energisings, six kinds of phase states are corresponding respectively, and the motor starting time that above-mentioned pulse voltage is corresponding is less than time constant of electric motors; Repeat above-mentioned six step galvanizations, continue to gather at least two group current differential; Choose any two groups of current differential; The condition of six kinds of equilbrium positions of any two groups of current differential and rotor demand fulfillment is respectively mated, determines the position of rotor; According to the position starter motor of rotor.Mated by satisfied condition needed for any two groups of six kinds of positions measuring differences and electronics rotor at least three group current differential measured like this, thus judge the particular location of electronics rotor, only need the comparison carrying out current differential, without the need to injecting big current, do not need to increase extra adjunct circuit yet, thus simplification electric machine structure, reduce the manufacturing cost of motor, improve useful life and the reliability of motor.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation without hall electric machine;
The schematic flow sheet of a kind of starting method without hall electric machine that Fig. 2 provides for embodiments of the invention;
The another kind that Fig. 3 provides for embodiments of the invention is without the schematic flow sheet of the starting method of hall electric machine;
Fig. 4 is the position view of the rotor without hall electric machine;
The structural representation of a kind of starting drive without hall electric machine that Fig. 5 provides for embodiments of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the embodiment of the present invention is three phase electric machine without hall electric machine, and this three phase electric machine comprises the different three-phase voltage input of phase place, and wherein, three kinds of voltage-phases of this three phase electric machine are respectively U phase place, V phase place and W phase place.Concrete, as shown in Figure 1 without hall electric machine structural representation shown in, this is made up of rotor 11 and stator 12 without hall electric machine, and all rotors 11 in this motor can be equivalent to the three kinds of rotors 11 possessing three kinds of different voltage-phases, namely this three phase electric machine is made up of the rotor and stator overlapping three different voltage-phases more, and the phase place of these three kinds of rotors 11 is respectively phase place U, phase place V and phase place W.In addition, the order of the six step energisings mentioned in the present embodiment, can according to the order of phase place UV-UW-VW-VU-WU-WV to motor M energising (letter write on above represents electric current and flows into phase, and the letter write on below represents outflow of bus current phase).
Embodiments of the invention provide a kind of starting method without hall electric machine, and as shown in Figure 2, the method specifically comprises the steps:
201, the starting drive without hall electric machine applies pulse voltage to the two-phase in the three-phase of motor successively according to six step energisings, and gathers pulse at every turn from entering into the current differential flowing out two-phase, obtains one group of current differential.
Wherein, one group of above-mentioned current differential comprises the current differential that in the energising of this six step, six kinds of phase states are corresponding respectively.If six kinds of phase states (six conducting states namely existing for motor controllable silicon) of six above-mentioned step energisings are respectively UV, UW, VW, VU, WU, WV, its current differential corresponding is respectively I
uV, I
vU, I
uW, I
wU, I
wVand I
vW.Concrete, when this device is any two-phase applying pulse voltage in the three-phase of this three phase electric machine at every turn, pulse voltage can be applied to this two-phase of often overlapping in rotor simultaneously.
In addition, it should be noted that, to be that this starting drive without hall electric machine is instantaneous be applied to this motor to above-mentioned pulse voltage, owing to being instantaneous pressurization, therefore, the motor starting time that the pulse voltage applied for motor is corresponding can be less than time constant of electric motors, thus can ensure that motor is unlikely to start, and motor when be unlikely to start time so that ensure motor be unlikely to start, can according to the current differential collected at the particular location just judging rotor under motor inactive state, and then improve startability and the stability of motor.Wherein, above-mentioned motor starting time is that this motor starts the required time after this pulse voltage of injection, and above-mentioned time constant of electric motors is also mechanical time constant, conventional being interpreted as in this area: from starting to the time experienced when rotating speed reaches 63.2% of no-load speed after motor is applied in voltage.
Exemplary, the phase voltage equation of motor is:
wherein, above-mentioned u
afor phase voltage, R is phase resistance, i
afor phase current, L
afor phase inductance, e
afor back electromotive force.When motor has just started to start (also not rotating) time, now can think that back-emf is zero, the voltage of phase resistance is negligible, and therefore voltage equation just can represent with following equation:
by as can be seen from the above equation, when motor has just started to start (also not rotating) time, the size of inductance be with electric current be changing into inverse ratio, if that is inductance becomes large, then curent change reduces.If inductance diminishes, then curent change becomes large.Therefore we can apply an instantaneous starting voltage for motor thus when ensureing that motor does not start (rotor is motionless), by detecting because inductance changes the curent change caused, judge the position of rotor.
Optionally, as shown in Figure 3, step 201 specifically comprises:
201a, apply pulse voltage without the starting drive of hall electric machine to any two-phase in the three-phase of motor, and gather pulse from entering into the current differential flowing out two-phase.
201b, without hall electric machine starting drive repeat said process, complete to motor six steps energising and current differential collections, obtain one group of current differential.
In the present embodiment, if after the current differential that this device is corresponding when getting motor phase state and being UV, namely this device is after U, V two-phase of motor has rushed electricity, next this device can continue to be energized to U, W two-phase of motor, apply pulse voltage, detecting and record the current value flowing through U, W two-phase when the current value that flows through U, W two-phase when this pulse enters and this pulse close to an end, then obtaining this pulse from entering into the current differential flowing out this two-phase.By that analogy, according to predetermined order complete to motor six steps energising and current differential detect.
202, the starting drive without hall electric machine repeats above-mentioned six step galvanizations, continues to gather at least one group of current differential.
Exemplary, because motor controllable silicon exists six conducting states, under six conducting states, always have alternate current changing rate is substantially identical.Such as, with the electric machine structure schematic diagram shown in Fig. 1, we can see, S is extremely just to U phase, N pole is divided equally with W phase by V phase, therefore the magnetic flux phi of V, W can be thought identical, and simultaneously due to V=Φ/S, therefore the electromagnetism intensity of V, W is also identical, and induced field current δ=VLvsin θ, thus can also show that the winding length of V, W and rotating speed are also identical, therefore, finally we can obtain I
vWand I
wVcurrent value be identical, I
vWand I
wVcurrent differential be also identical.Therefore, in order to avoid the situation that the two groups of current differential collected are identical, the present invention by gathering at least three group current differential, can avoid the generation of this situation.
203, any two groups of current differential chosen by the starting drive without hall electric machine.
204, the condition any two groups of current differential and rotor being in respectively six kinds of equilbrium positions demand fulfillment respectively without the starting drive of hall electric machine is mated, and determines the position of rotor.
Exemplary, before the matching process realizing step 204, this starting drive without hall electric machine needs to obtain the condition that rotor is in six kinds of equilbrium positions difference demand fulfillment respectively.Need illustrate but, this without hall electric machine starting drive obtain rotor be in respectively six kinds of equilbrium positions respectively demand fulfillment condition and collection at least two group current differential time there is no sequencing.
In the present embodiment, rotor is six kinds relative to the equilbrium position in motor stator magnetic field.Concrete, known with reference to the electronics rotor-position schematic diagram shown in Fig. 4, six kinds of equilbrium positions of rotor specifically comprise:
Position 1, position 1 is in the N of motor stator extremely just to phase place U, and the S pole of motor stator is divided equally by phase place V and phase place W.
Position 2, position 1 is in the S of motor stator extremely just to phase place W, and the N pole of motor stator is divided equally by phase place U and phase place V.
Position 3, position 1 is in the N of motor stator extremely just to phase place V, and the S pole of motor stator is divided equally by phase place U and phase place W.
Position 4, position 1 is in the S of motor stator extremely just to phase place U, and the N pole of motor stator is divided equally by phase place V and phase place W.
Position 5, position 1 is in the N of motor stator extremely just to phase place W, and the S pole of motor stator is divided equally by phase place U and phase place V.
Position 6, position 1 is in the S of motor stator extremely just to phase place V, and the N pole of motor stator is divided equally by phase place U and phase place W.
Exemplary, when three of the three phase electric machine in the present embodiment phase places are set to phase place U, phase place V and phase place W, then the often group current differential in the above-mentioned at least three group current differential collected includes following six kinds of electric current: I
uV, I
vU, I
uW, I
wU, I
wVand I
vW.If first group of current differential in any two groups of current differential in step 105 is I
uV1, I
vU1, I
uW1, I
wU1, I
wV1and I
vW1, second group of current differential is I
uV2, I
vU2, I
uW2, I
wU2, I
wV2and I
vW2time;
If I
uV1>I
vU1and I
uW2>I
wU2, then determine that rotor is in position 1;
If I
vW1>I
wV1and I
uW2>I
wU2, then determine that rotor is in position 2;
If I
vW1>I
wU1and I
vU2>I
uV2, then determine that rotor is in position 3;
If I
wU1>I
uW1and I
vU2>I
uV2, then determine that rotor is in position 4;
If I
wU1>I
uW1and I
wV2>I
vW2, then determine that rotor is in position 5;
If I
uV1>I
vU1and I
wV2>I
vW2, then determine that rotor is in position 6.
Concrete, for the position 1 of rotor, if give the energising of U phase place forward, so can produce a N level in the pole shoe of respective rotor, oppositely be energized to V phase place (or W phase place) simultaneously, so can produce S pole in the pole shoe of respective rotor, just the magnetic field of inverse magnetic direction can be produced when such UV (or UW) is energized, the current variation value obtained should be minimum, and the magnetic field that winding produces when VU (or WU) is energized mutually is all paramagnetic direction, the current variation value obtained now should be greater than the situation that UV (or UW) is energized, so just, can draw and work as I
uV>I
vUand I
uW>I
wU, then determine that rotor is in position 1.By that analogy, the condition of demand fulfillment when rotor is under other five kinds of equilbrium positions can be obtained.
205, without the starting drive of hall electric machine according to the position starter motor of rotor.
Concrete, this starting drive without hall electric machine, after determining motor rotor position, just can determine the power-up sequence of the three-phase of this motor, thus starter motor.Such as, if this motor rotor position 1, then this is energized to U phase without the starting drive of hall electric machine, thus starts this motor.
The starting method without hall electric machine that embodiments of the invention provide, pulse voltage is applied to the two-phase in the three-phase of motor according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out two-phase, obtain one group of current differential, this group current differential comprises the current differential that in six step energisings, six kinds of phase states are corresponding respectively, and the motor starting time that above-mentioned pulse voltage is corresponding is less than time constant of electric motors; Repeat above-mentioned six step galvanizations, continue to gather at least two group current differential; Choose any two groups of current differential; The condition of six kinds of equilbrium positions of any two groups of current differential and rotor demand fulfillment is respectively mated, determines the position of rotor; According to the position starter motor of rotor.Mated by satisfied condition needed for any two groups of six kinds of positions measuring differences and electronics rotor at least three group current differential measured like this, thus judge the particular location of electronics rotor, only need the comparison carrying out current differential, without the need to injecting big current, do not need to increase extra adjunct circuit yet, thus simplification electric machine structure, reduce the manufacturing cost of motor, improve useful life and the reliability of motor.
In addition, it should be noted that, prior art additionally provides one and carrys out positioning motor rotor-position without hall electric machine starting method, the method comprises: measure the electric current under six kinds of phase states in six step energisings respectively, relatively in these six electric currents, find out maximum wherein with the optimizing phase of its correspondence, then derive the position of rotor according to this optimizing phase.But this method exists a kind of defect, namely when having two values to be identical in six current values measured, and when these two identical current values are maximum, now cannot judge the particular location of now rotor.And it is known based on the detailed description of step 202, it is substantially identical that six kinds of phase conduction states of motor always have alternate current value, therefore, should determine the position of rotor in this way, the very large motor rotor position that may cause determines failure.
And between the method and independent claims of the present invention 1, there are following three kinds of differences:
The first, the present invention carry out motor rotor position location time application be current differential, and prior art carry out motor rotor position location time application be current value.
The second, the present invention by measuring at least two group current differential, thus avoids the situation all having same current difference in the two groups of current differential collected, and then avoids rotor to locate unsuccessfully.
3rd, when the present invention is by any two groups of current differential and the rotor to derive in advance being in respectively six kinds of equilbrium positions, the condition of demand fulfillment is compared, thus determines the position that rotor is current accurately.Only by a lowest high-current value in this and prior art, according to electromagnetic induction principle, infer that motor rotor position is different.
Embodiments of the invention provide a kind of starting drive without hall electric machine, and as shown in Figure 5, this device 3 comprises: collecting unit 31, acquiring unit 32, determining unit 33 and start unit 34, wherein:
Collecting unit 31, for applying pulse voltage to the two-phase in the three-phase of motor successively according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out two-phase, obtain one group of current differential, this group of current differential comprises the current differential that in six step energisings, six kinds of phase states are corresponding respectively; Wherein, the motor starting time that above-mentioned pulse voltage is corresponding is less than time constant of electric motors.
Wherein, the three phase electric machine described in the present embodiment comprises the different three-phase voltage input of phase place, and three kinds of voltage-phases of this three phase electric machine are respectively U phase place, V phase place and W phase place.Concrete, six step energisings of above-mentioned motor have come according to the order of phase place UV-UW-VW-VU-WU-WV.
Collecting unit 31, also for repeating above-mentioned six step galvanizations, continues to gather at least one group of current differential.
Acquiring unit 32, for choosing any two groups of current differential that collecting unit 31 collects.
Determining unit 33, when any two groups of current differential and rotor for being got by acquiring unit 32 are in six kinds of equilbrium positions respectively, the condition of demand fulfillment is mated, and determines the position of rotor.
Start unit 34, for the position starter motor of rotor determined according to determining unit 33.
Optionally, the three-phase of above-mentioned motor is respectively phase place U, phase place V and phase place W, and six kinds of equilbrium positions of rotor comprise:
Position 1, position 1 is in the N of motor stator extremely just to phase place U, and the S pole of motor stator is divided equally by phase place V and phase place W.
Position 2, position 1 is in the S of motor stator extremely just to phase place W, and the N pole of motor stator is divided equally by phase place U and phase place V.
Position 3, position 1 is in the N of motor stator extremely just to phase place V, and the S pole of motor stator is divided equally by phase place U and phase place W.
Position 4, position 1 is in the S of motor stator extremely just to phase place U, and the N pole of motor stator is divided equally by phase place V and phase place W.
Position 5, position 1 is in the N of motor stator extremely just to phase place W, and the S pole of motor stator is divided equally by phase place U and phase place V.
Position 6, position 1 is in the S of motor stator extremely just to phase place V, and the N pole of motor stator is divided equally by phase place U and phase place W.
Further, if first group of current differential in any two groups of current differential is I
uV1, I
vU1, I
uW1, I
wU1, I
wV1and I
vW1, second group of current differential is I
uV2, I
vU2, I
uW2, I
wU2, I
wV2and I
vW2time;
Determining unit 33 specifically for:
If I
uV1>I
vU1and I
uW2>I
wU2, then determine that rotor is in position 1;
If I
vW1>I
wV1and I
uW2>I
wU2, then determine that rotor is in position 2;
If I
vW1>I
wU1and I
vU2>I
uV2, then determine that rotor is in position 3;
If I
wU1>I
uW1and I
vU2>I
uV2, then determine that rotor is in position 4;
If I
wU1>I
uW1and I
wV2>I
vW2, then determine that rotor is in position 5;
If I
uV1>I
vU1and I
wV2>I
vW2, then determine that rotor is in position 6.
Optionally, collecting unit 31 is applying pulse voltage according to six step energisings to the two-phase in the three-phase of motor, and gathers pulse at every turn from entering into the current differential flowing out two-phase, specifically comprises when obtaining one group of current differential:
Apply pulse voltage to any two-phase in the three-phase of motor, and gather pulse from entering into the current differential flowing out two-phase;
Repeat said process, complete six step energising and the current differential collections to motor, obtain one group of current differential.
The starting drive without hall electric machine that embodiments of the invention provide, pulse voltage is applied to the two-phase in the three-phase of motor according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out two-phase, obtain one group of current differential, this group current differential comprises the current differential that in six step energisings, six kinds of phase states are corresponding respectively, and the motor starting time that above-mentioned pulse voltage is corresponding is less than time constant of electric motors; Repeat above-mentioned six step galvanizations, continue to gather at least two group current differential; Choose any two groups of current differential; The condition of six kinds of equilbrium positions of any two groups of current differential and rotor demand fulfillment is respectively mated, determines the position of rotor; According to the position starter motor of rotor.Mated by satisfied condition needed for any two groups of six kinds of positions measuring differences and electronics rotor at least three group current differential measured like this, thus judge the particular location of electronics rotor, only need the comparison carrying out current differential, without the need to injecting big current, do not need to increase extra adjunct circuit yet, thus simplification electric machine structure, reduce the manufacturing cost of motor, improve useful life and the reliability of motor.
The above, above embodiment only in order to the technical scheme of the application to be described, is not intended to limit; Although with reference to previous embodiment to present application has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the application.
Claims (10)
1. without a starting method for hall electric machine, it is characterized in that, comprising:
Pulse voltage is applied to the two-phase in the three-phase of motor successively according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out described two-phase, obtain one group of current differential, described one group of current differential comprises the current differential that in described six step energisings, six kinds of phase states are corresponding respectively; Wherein, the motor starting time that described pulse voltage is corresponding is less than time constant of electric motors;
Repeat above-mentioned six step galvanizations, continue to gather at least one group of current differential;
Choose any two groups of current differential;
The condition described any two groups of current differential and the rotor preset being in respectively demand fulfillment during six kinds of equilbrium positions is mated, and determines the position of described rotor;
Described motor is started according to the position of described rotor.
2. method according to claim 1, it is characterized in that, described three phase electric machine comprises the different three-phase voltage input of phase place, and three kinds of voltage-phases of described three phase electric machine are respectively U phase place, V phase place and W phase place, and six kinds of equilbrium positions of described rotor comprise:
Position 1, described position 1 is in the N of described motor stator extremely just to described phase place U, and the S pole of described motor stator is divided equally by described phase place V and described phase place W;
Position 2, described position 1 is in the S of described motor stator extremely just to described phase place W, and the N pole of described motor stator is divided equally by described phase place U and described phase place V;
Position 3, described position 1 is in the N of described motor stator extremely just to described phase place V, and the S pole of described motor stator is divided equally by described phase place U and described phase place W;
Position 4, described position 1 is in the S of described motor stator extremely just to described phase place U, and the N pole of described motor stator is divided equally by described phase place V and described phase place W;
Position 5, described position 1 is in the N of described motor stator extremely just to described phase place W, and the S pole of described motor stator is divided equally by described phase place U and described phase place V;
Position 6, described position 1 is in the S of described motor stator extremely just to described phase place V, and the N pole of described motor stator is divided equally by described phase place U and described phase place W.
3. method according to claim 2, is characterized in that, if first group of current differential in described any two groups of current differential is I
uV1, I
vU1, I
uW1, I
wU1, I
wV1and I
vW1, second group of current differential is I
uV2, I
vU2, I
uW2, I
wU2, I
wV2and I
vW2time;
The described predetermined condition by six kinds of equilbrium positions of described any two groups of current differential and described rotor demand fulfillment is respectively mated, and determines that the position of described rotor specifically comprises:
If I
uV1>I
vU1and I
uW2>I
wU2, then determine that described rotor is in position 1;
If I
vW1>I
wV1and I
uW2>I
wU2, then determine that described rotor is in position 2;
If I
vW1>I
wU1and I
vU2>I
uV2, then determine that described rotor is in position 3;
If I
wU1>I
uW1and I
vU2>I
uV2, then determine that described rotor is in position 4;
If I
wU1>I
uW1and I
wV2>I
vW2, then determine that described rotor is in position 5;
If I
uV1>I
vU1and I
wV2>I
vW2, then determine that described rotor is in position 6.
4. method according to claim 1, it is characterized in that, described energising to the two-phase in the three-phase of motor according to six steps applies pulse voltage, and gathers pulse at every turn from entering into the current differential flowing out described two-phase, obtains one group of current differential and specifically comprises:
Apply pulse voltage to any two-phase in the three-phase of motor, and gather pulse from entering into the current differential flowing out described two-phase;
Repeat said process, complete six step energising and the current differential collections to described motor, obtain one group of current differential.
5. the method according to any one of Claims 1-4, it is characterized in that, described three phase electric machine comprises the different three-phase voltage input of phase place, three kinds of voltage-phases of described three phase electric machine are respectively U phase place, V phase place and W phase place, and six step energisings of described motor have come according to the order of phase place UV-UW-VW-VU-WU-WV.
6. without a starting drive for hall electric machine, it is characterized in that, comprising:
Collecting unit, for applying pulse voltage to the two-phase in the three-phase of motor successively according to six step energisings, and gather pulse at every turn from entering into the current differential flowing out described two-phase, obtain one group of current differential, described one group of current differential comprises the current differential that in described six step energisings, six kinds of phase states are corresponding respectively; Wherein, the motor starting time that described pulse voltage is corresponding is less than time constant of electric motors;
Described collecting unit, also for repeating above-mentioned six step galvanizations, continues to gather at least one group of current differential;
Acquiring unit, for choosing any two groups of current differential that described collecting unit collects;
Determining unit, when described any two groups of current differential and rotor for being got by described acquiring unit are in six kinds of equilbrium positions respectively, the condition of demand fulfillment is mated, and determines the position of described rotor;
Start unit, the position for the described rotor determined according to described determining unit starts described motor.
7. device according to claim 6, it is characterized in that, described three phase electric machine comprises the different three-phase voltage input of phase place, and three kinds of voltage-phases of described three phase electric machine are respectively U phase place, V phase place and W phase place, and six kinds of equilbrium positions of described rotor comprise:
Position 1, described position 1 is in the N of described motor stator extremely just to described phase place U, and the S pole of described motor stator is divided equally by described phase place V and described phase place W;
Position 2, described position 1 is in the S of described motor stator extremely just to described phase place W, and the N pole of described motor stator is divided equally by described phase place U and described phase place V;
Position 3, described position 1 is in the N of described motor stator extremely just to described phase place V, and the S pole of described motor stator is divided equally by described phase place U and described phase place W;
Position 4, described position 1 is in the S of described motor stator extremely just to described phase place U, and the N pole of described motor stator is divided equally by described phase place V and described phase place W;
Position 5, described position 1 is in the N of described motor stator extremely just to described phase place W, and the S pole of described motor stator is divided equally by described phase place U and described phase place V;
Position 6, described position 1 is in the S of described motor stator extremely just to described phase place V, and the N pole of described motor stator is divided equally by described phase place U and described phase place W.
8. device according to claim 7, is characterized in that, if first group of current differential in described any two groups of current differential is I
uV1, I
vU1, I
uW1, I
wU1, I
wV1and I
vW1, second group of current differential is I
uV2, I
vU2, I
uW2, I
wU2, I
wV2and I
vW2time;
Described determining unit specifically for:
If I
uV1>I
vU1and I
uW2>I
wU2, then determine that described rotor is in position 1;
If I
vW1>I
wV1and I
uW2>I
wU2, then determine that described rotor is in position 2;
If I
vW1>I
wU1and I
vU2>I
uV2, then determine that described rotor is in position 3;
If I
wU1>I
uW1and I
vU2>I
uV2, then determine that described rotor is in position 4;
If I
wU1>I
uW1and I
wV2>I
vW2, then determine that described rotor is in position 5;
If I
uV1>I
vU1and I
wV2>I
vW2, then determine that described rotor is in position 6.
9. device according to claim 6, it is characterized in that, described collecting unit is applying pulse voltage according to six step energisings to the two-phase in the three-phase of motor, and gathers pulse at every turn from entering into the current differential flowing out described two-phase, specifically comprises when obtaining one group of current differential:
Apply pulse voltage to any two-phase in the three-phase of motor, and gather pulse from entering into the current differential flowing out described two-phase;
Repeat said process, complete six step energising and the current differential collections to described motor, obtain one group of current differential.
10. the device according to any one of claim 6 to 9, it is characterized in that, described three phase electric machine comprises the different three-phase voltage input of phase place, three kinds of voltage-phases of described three phase electric machine are respectively U phase place, V phase place and W phase place, and six step energisings of described motor have come according to the order of phase place UV-UW-VW-VU-WU-WV.
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| CN201510213363.8A CN104796052B (en) | 2015-04-29 | 2015-04-29 | A kind of startup method and device of no hall electric machine |
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Cited By (1)
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| CN109428531A (en) * | 2017-08-24 | 2019-03-05 | 广明光电股份有限公司 | The determining method of motor control angle |
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| Publication number | Publication date |
|---|---|
| CN104796052B (en) | 2018-10-26 |
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