CN104796052B - A kind of startup method and device of no hall electric machine - Google Patents
A kind of startup method and device of no hall electric machine Download PDFInfo
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- CN104796052B CN104796052B CN201510213363.8A CN201510213363A CN104796052B CN 104796052 B CN104796052 B CN 104796052B CN 201510213363 A CN201510213363 A CN 201510213363A CN 104796052 B CN104796052 B CN 104796052B
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- 238000010586 diagram Methods 0.000 description 6
- 230000005291 magnetic effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
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Abstract
The embodiment of the present invention provides a kind of startup method and device of no hall electric machine, is related to motor field, solves existing rotor fixed position method and crosses flow problem caused by needing to inject high current.This method includes：Apply pulse voltage according to the two-phase that six steps are powered successively into the three-phase of motor, and pulse is acquired every time from the current differential for entering the outflow two-phase, obtain one group of current differential, this group of current differential includes the corresponding current differential of six kinds of phase states during six steps are powered, and the motor starting time of the pulse voltage is less than time constant of electric motors；Above-mentioned six steps galvanization is repeated, continues to acquire at least one set of current differential；Choose arbitrary two groups of current differentials；It needs the condition met to match when arbitrary two groups of current differentials are respectively at six kinds of equilbrium positions with rotor, determines the position of rotor；Start motor according to the position of rotor.
Description
Technical field
The present invention relates to motor field more particularly to a kind of startup method and devices of no hall electric machine.
Background technology
Currently, brshless DC motor (Brushless Direct Current Motor, abbreviation without Hall sensor
BLDCM) on startup, it will usually the specific location of rotor is obtained using forced localization method, i.e., in a short time to
The prodigious dash current of injection forces rotor to go to certain by armature field and rotor permanent magnet field interactions in BLDCM
One specific position.
But the method for this prodigious dash current of injection can be limited first by BLDCM capacity.If specifically,
It is that BLDCM capacity is excessive, then can increases motor cost；If BLDCM capacity is too small, then it can lead to the electric current that BLDCM injects not
It is enough big, and then the positioning of rotor is caused to fail, if at this point, being forcibly introduced into for success positioning motor rotor-position big
Electric current can then cause overcurrent (i.e. electric motor short circuit, disconnected phase, overload etc.), or even cause the control panel of motor to burn out because of overcurrent
Or it catches fire.
Invention content
It is fixed to solve existing rotor for a kind of startup method and device for no hall electric machine that the embodiment of the present invention provides
Position method crosses flow problem caused by needing to inject high current.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
In a first aspect, a kind of startup method of no hall electric machine is provided, including：
Apply pulse voltage according to the two-phase from six steps to the three-phase of motor successively that is powered, and acquire pulse every time from
The current differential for flowing out the two-phase is entered, one group of current differential is obtained, one group of current differential includes that six step is logical
The corresponding current differential of six kinds of phase states in electricity；Wherein, the corresponding motor starting time of the pulse voltage is less than
Time constant of electric motors；
Above-mentioned six steps galvanization is repeated, continues to acquire at least one set of current differential；
Arbitrary two groups of current differentials are chosen, and obtains when the rotor is respectively at six kinds of equilbrium positions and needs to meet
Condition；
Needs meet when arbitrary two groups of current differentials and the rotor are respectively at six kinds of equilbrium positions
Condition is matched, and determines the position of the rotor；
Start the motor according to the position of the rotor.
Second aspect provides a kind of starter of no hall electric machine, which is characterized in that including：
Collecting unit, the two-phase for being powered successively into the three-phase of motor according to six steps applies pulse voltage, and adopts
Collect pulse every time from the current differential for flowing out the two-phase is entered, obtains one group of current differential, one group of current differential
The corresponding current differential of six kinds of phase states in being powered including six step；Wherein, the corresponding electricity of the pulse voltage
Machine starts the time less than time constant of electric motors；
The collecting unit is additionally operable to repeat above-mentioned six steps galvanization, continues to acquire at least one set of current differential；
Acquiring unit for choosing the collected arbitrary two groups of current differentials of the collecting unit, and obtains the motor
The condition met is needed when rotor is respectively at six kinds of equilbrium positions；
Determination unit, arbitrary two groups of current differentials for getting the acquiring unit and the rotor
It needs the condition met to be matched when being respectively at six kinds of equilbrium positions, determines the position of the rotor；
The position of start unit, the rotor for being determined according to the determination unit starts the motor.
The embodiment of the present invention provide startup method, that is, device without hall electric machine, be powered according to six steps to motor three
Two-phase in phase applies pulse voltage, and acquires pulse every time from the current differential for entering outflow two-phase, obtains one group
Current differential, this group of current differential include the corresponding current differential of six kinds of phase states during six steps are powered, above-mentioned list
The corresponding motor starting time of pulse voltage is less than time constant of electric motors；Above-mentioned six steps galvanization is repeated, continues acquisition at least
Two groups of current differentials；Choose arbitrary two groups of current differentials；By six kinds of equilbrium positions of arbitrary two groups of current differentials and rotor
The condition for being respectively necessary for meeting is matched, and determines the position of rotor；Start motor according to the position of rotor.In this way
It is full needed for six kinds of positions by arbitrary two groups of measurement differences and electronics rotor in at least three groups of current differentials that will measure
The condition of foot is matched, and to judge the specific location of electronics rotor, only needs the comparison for carrying out current differential, nothing
High current need to be injected, additional adjunct circuit need not be also increased, to simplify electric machine structure, reduces being manufactured into for motor
This, improves the service life and reliability of motor.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 for no hall electric machine structural schematic diagram；
Fig. 2 is a kind of flow diagram of the startup method for no hall electric machine that the embodiment of the present invention provides；
Fig. 3 is the flow diagram for another startup method without hall electric machine that the embodiment of the present invention provides；
Fig. 4 for the rotor of no hall electric machine position view；
Fig. 5 is a kind of structural schematic diagram of the starter for no hall electric machine that the embodiment of the present invention provides.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the embodiment of the present invention is three phase electric machine without hall electric machine, which includes the different three-phase voltage of phase
Input terminal, wherein three kinds of voltage-phases of the three phase electric machine are respectively U phases, V phases and W phases.Specifically, such as Fig. 1 institutes
Shown in the structural schematic diagram without hall electric machine shown, this is made of without hall electric machine rotor 11 and stator 12, and the electricity
All rotors 11 in machine can be equivalent to three kinds of rotors 11 for having three kinds of different voltages phases, i.e. the three phase electric machine is by more
The rotor and stator composition of three different voltages phases of set, the phases of these three rotors 11 be respectively phase U, phase V and
Phase W.In addition, the sequence that six steps being previously mentioned in the present embodiment are powered, it can be according to the suitable of phase UV-UW-VW-VU-WU-WV
Sequence is come be powered to motor M (letter for writing on front represents electric current inflow phase, writes on subsequent letter and represents electric current outflow phase).
The embodiment of the present invention provides a kind of startup method of no hall electric machine, as shown in Fig. 2, this method specifically include as
Lower step：
201, the starter without hall electric machine applies simple venation according to the two-phase that six steps are powered successively into the three-phase of motor
Voltage is rushed, and acquires pulse every time from the current differential for entering outflow two-phase, obtains one group of current differential.
Wherein, one group of above-mentioned current differential includes the corresponding current difference of six kinds of phase states during six step is powered
Value.If six kinds of phase states that above-mentioned six steps are powered (i.e. motor it is silicon-controlled present in six conducting states) be respectively UV,
UW, VW, VU, WU, WV, corresponding current differential are IUV、IVU、IUW、IWU、IWVAnd IVW.Specifically, the device is each
When applying pulse voltage for the arbitrary two-phase in the three-phase of the three phase electric machine, can simultaneously it apply to this two-phase in every set rotor
Pulse voltage.
Furthermore, it is necessary to explanation, above-mentioned pulse voltage is that the starter without hall electric machine is instantaneously applied to
The motor, due to being instantaneously to pressurize, the corresponding motor starting time of pulse voltage applied by motor can be less than
Time constant of electric motors, so as to ensure that motor is unlikely to start, and motor be unlikely to start when so that ensure motor not
It, can be according to collected current differential in the tool that just can judge rotor under motor stationary state in the case of as startup
Body position, and then improve the startability and stability of motor.Wherein, above-mentioned motor starting time is that the motor is being noted
Start the required time after entering the pulse voltage, and above-mentioned time constant of electric motors also makes mechanical time constant, this field normal
It is construed to：Motor is applied in after voltage from starting to the time undergone when rotating speed reaches the 63.2% of no-load speed.
Illustratively, the phase voltage equation of motor is：Wherein, above-mentioned uaFor mutually electricity
Pressure, R is phase resistance, iaFor phase current, LaFor phase inductance, eaFor counter electromotive force.When motor just starts to start (there are no rotations)
When, at this time it is considered that back-emf is zero, the voltage of phase resistance can be ignored, therefore voltage equation can be used such as
Lower equation indicates：By as can be seen from the above equation, when motor has just started to start (there are no rotations),
The size of inductance is that the variation with electric current is inversely proportional, that is to say, that if inductance becomes larger, curent change reduces.If inductance
Become smaller, then curent change becomes larger.Therefore we can be that motor applies an instantaneous starting voltage to not opened in guarantee motor
In the case of dynamic (rotor is motionless), by detection curent change caused by inductance changes, to judge the position of rotor.
Optionally, as shown in figure 3, step 201 specifically includes：
The arbitrary two-phase of 201a, the starter without hall electric machine into the three-phase of motor applies pulse voltage, and adopts
Collection pulse flows out the current differential of two-phase from entering.
201b, the starter without hall electric machine repeat the above process, and complete to the six steps energization of motor and current differential
Acquisition, obtains one group of current differential.
In the present embodiment, if the device after corresponding current differential, i.e., should when getting motor phase state and being UV
Device is after U, V two-phase of motor punch electricity, and next which can continue to be powered to U, W two-phase of motor, apply simple venation
Voltage is rushed, detects and records when the pulse closes to an end into the fashionable current value for flowing through U, W two-phase and the pulse and flow through U, W
Then the current value of two-phase obtains the pulse from the current differential for entering the outflow two-phase.And so on, according to scheduled suitable
Sequence completes to be powered to six steps of motor and current differential detects.
202, the starter without hall electric machine repeats above-mentioned six steps galvanization, continues to acquire at least one set of current difference
Value.
Illustratively, since motor is silicon-controlled, there are six conducting states, and always there are two phases under six conducting states
Between current changing rate be essentially identical.For example, with electric machine structure schematic diagram shown in FIG. 1, it will be seen that S is extremely just
To U phases, the poles N are divided equally by V phases with W phases, thus the magnetic flux phi of V, W may be considered it is identical, simultaneously because V=Φ/S, because
The electromagnetism intensity of this V, W are also identical, and induced field current δ=VLvsin θ, to obtain the winding length of V, W
And rotating speed is also identical, therefore, final we can obtain IVWAnd IWVCurrent value be identical, IVWAnd IWVElectric current
Difference is also identical.Therefore, in order to avoid the identical situation of collected two groups of current differentials, the present invention can pass through acquisition
At least three groups of current differentials, to avoid the generation of such case.
203, the starter without hall electric machine chooses arbitrary two groups of current differentials.
204, arbitrary two groups of current differentials and rotor are respectively at six kinds of balances by the starter without hall electric machine
The condition that position is respectively necessary for meeting is matched, and determines the position of rotor.
Illustratively, before the matching process for realizing step 204, which needs to obtain motor
Rotor is respectively at six kinds of equilbrium positions and is respectively necessary for the condition met.It is needing to illustrate but, the startup without hall electric machine
Device is respectively at six kinds of equilbrium positions in acquisition rotor and is respectively necessary for the condition met and acquisition at least two groups electric current
Sequencing is had no when difference.
In the present embodiment, rotor is six kinds relative to the equilbrium position in motor stator magnetic field.Specifically, with reference to figure
Electronics rotor position view shown in 4 is it is found that six kinds of equilbrium positions of rotor specifically include：
Position 1, position 1 is in the poles the N face phase U of motor stator, and the poles S of motor stator are put down by phase V and phase W
Point.
Position 2, position 1 is in the poles the S face phase W of motor stator, and the poles N of motor stator are put down by phase U and phase V
Point.
Position 3, position 1 is in the poles the N face phase V of motor stator, and the poles S of motor stator are put down by phase U and phase W
Point.
Position 4, position 1 is in the poles the S face phase U of motor stator, and the poles N of motor stator are put down by phase V and phase W
Point.
Position 5, position 1 is in the poles the N face phase W of motor stator, and the poles S of motor stator are put down by phase U and phase V
Point.
Position 6, position 1 is in the poles the S face phase V of motor stator, and the poles N of motor stator are put down by phase U and phase W
Point.
Illustratively, three phases of the three phase electric machine in the present embodiment are set to phase U, phase V and phase W
When, then every group of current differential in above-mentioned collected at least three groups of current differentials includes following six kinds of electric currents：IUV、IVU、
IUW、IWU、IWVAnd IVW.If first group of current differential in arbitrary two groups of current differentials in step 105 is IUV1、IVU1、IUW1、
IWU1、IWV1And IVW1, second group of current differential is IUV2、IVU2、IUW2、IWU2、IWV2And IVW2When；
If IUV1>IVU1And IUW2>IWU2, it is determined that rotor is in position 1；
If IVW1>IWV1And IUW2>IWU2, it is determined that rotor is in position 2；
If IVW1>IWU1And IVU2>IUV2, it is determined that rotor is in position 3；
If IWU1>IUW1And IVU2>IUV2, it is determined that rotor is in position 4；
If IWU1>IUW1And IWV2>IVW2, it is determined that rotor is in position 5；
If IUV1>IVU1And IWV2>IVW2, it is determined that rotor is in position 6.
Specifically, by taking the position of rotor 1 as an example, if being powered to U phase forward directions, then can be in the pole shoe of respective rotor
Place generates one N grades, while being reversely powered to V phases (or W phases), then the poles S can be generated in the pole shoe of respective rotor, this
Sample UV (or UW) will generate the magnetic field of inverse magnetic direction when being powered, obtained current variation value should be minimum, and when VU (or
The magnetic field that winding generates when WU) being mutually powered all is paramagnetic direction, and obtained current variation value at this time should be greater than UV (or UW)
The case where energization, can obtain work as I in this wayUV>IVUAnd IUW>IWU, it is determined that rotor is in position 1.And so on, it can
To obtain the condition for needing to meet when rotor is under other five kinds of equilbrium positions.
205, the starter without hall electric machine starts motor according to the position of rotor.
Specifically, the starter without hall electric machine can determine the motor after motor rotor position is determined
The power-up sequence of three-phase, to start motor.If for example, the motor rotor position 1, the starter without hall electric machine to
U phases are powered, to start the motor.
The startup method without hall electric machine that the embodiment of the present invention provides, is powered according to six steps into the three-phase of motor
Two-phase applies pulse voltage, and acquires pulse every time from the current differential for entering outflow two-phase, obtains one group of current difference
Value, this group of current differential include the corresponding current differential of six kinds of phase states during six steps are powered, above-mentioned pulse electricity
Corresponding motor starting time is pressed to be less than time constant of electric motors；Above-mentioned six steps galvanization is repeated, continues to acquire at least two groups electricity
Flow difference；Choose arbitrary two groups of current differentials；Six kinds of equilbrium positions of arbitrary two groups of current differentials and rotor are respectively required for
The condition to be met is matched, and determines the position of rotor；Start motor according to the position of rotor.Pass through in this way by
The item met needed for six kinds of positions of arbitrary two groups of measurement differences and electronics rotor in at least three groups of current differentials measured
Part is matched, and to judge the specific location of electronics rotor, the comparison for carrying out current differential is only needed, without injection
High current need not also increase additional adjunct circuit, to simplify electric machine structure, reduce the manufacturing cost of motor, improve
The service life and reliability of motor.
Furthermore, it is necessary to explanation, the prior art, which additionally provides a kind of no hall electric machine and starts method and carry out positioning motor, to be turned
Sub- position, this method include：The electric current under six kinds of phase states during six steps are powered is measured respectively, is compared in this six electric currents, is looked for
Go out maximum value therein with its corresponding optimizing phase, the position of rotor is then derived according to the optimizing phase.But
There are a kind of defects for this method, i.e., there are two value are identical in ought measure six current value, and the two are identical
When current value is maximum value, the specific location for judging rotor at this time will be unable at this time.And the detailed description based on step 202
It is found that six kinds of phase conduction states of motor are always essentially identical there are two alternate current value, therefore, using this side
Method determines the position of rotor, and the prodigious motor rotor position that may result in determines failure.
And there are following three kinds of differences between this method and the independent claims 1 of the present invention：
First, what the present invention applied when motor rotor position positioning is current differential, and the prior art carries out motor
What rotor-position was applied when positioning is current value.
Second, the present invention is by measuring at least two groups current differential, to avoid in collected two groups of current differentials
There is the case where same current difference, and then avoids rotor positioning failure.
Third, the present invention are by the way that arbitrary two groups of current differentials are respectively at six kinds with the rotor derived in advance
The condition met is needed to be compared when equilbrium position, to accurately determine the current position of rotor.This with it is existing
It is inferred to motor rotor position according to electromagnetic induction principle only by a maximum current value in technology and is different.
The embodiment of the present invention provides a kind of starter of no hall electric machine, as shown in figure 5, the device 3 includes：Acquisition
Unit 31, acquiring unit 32, determination unit 33 and start unit 34, wherein：
Collecting unit 31, the two-phase for being powered successively into the three-phase of motor according to six steps apply pulse voltage, and
Acquisition pulse obtains one group of current differential, which includes every time from the current differential for entering outflow two-phase
The corresponding current differential of six kinds of phase states during six steps are powered；Wherein, the above-mentioned corresponding electric motor starting of pulse voltage
Time is less than time constant of electric motors.
Wherein, the three phase electric machine described in the present embodiment includes the different three-phase voltage input terminal of phase, the three phase electric machine
Three kinds of voltage-phases be respectively U phases, V phases and W phases.Specifically, six steps of above-mentioned motor are powered according to phase UV-
The sequence of UW-VW-VU-WU-WV is completed.
Collecting unit 31 is additionally operable to repeat above-mentioned six steps galvanization, continues to acquire at least one set of current differential.
Acquiring unit 32, for choosing the collected arbitrary two groups of current differentials of collecting unit 31.
Determination unit 33, arbitrary two groups of current differentials for getting acquiring unit 32 are respectively at rotor
It needs the condition met to be matched when six kinds of equilbrium positions, determines the position of rotor.
The position of start unit 34, the rotor for being determined according to determination unit 33 starts motor.
Optionally, the three-phase of above-mentioned motor is respectively phase U, phase V and phase W, six kinds of balances of rotor
Position includes：
Position 1, position 1 is in the poles the N face phase U of motor stator, and the poles S of motor stator are put down by phase V and phase W
Point.
Position 2, position 1 is in the poles the S face phase W of motor stator, and the poles N of motor stator are put down by phase U and phase V
Point.
Position 3, position 1 is in the poles the N face phase V of motor stator, and the poles S of motor stator are put down by phase U and phase W
Point.
Position 4, position 1 is in the poles the S face phase U of motor stator, and the poles N of motor stator are put down by phase V and phase W
Point.
Position 5, position 1 is in the poles the N face phase W of motor stator, and the poles S of motor stator are put down by phase U and phase V
Point.
Position 6, position 1 is in the poles the S face phase V of motor stator, and the poles N of motor stator are put down by phase U and phase W
Point.
Further, if first group of current differential in arbitrary two groups of current differentials is IUV1、IVU1、IUW1、IWU1、IWV1With
And IVW1, second group of current differential is IUV2、IVU2、IUW2、IWU2、IWV2And IVW2When；
Determination unit 33 is specifically used for：
If IUV1>IVU1And IUW2>IWU2, it is determined that rotor is in position 1；
If IVW1>IWV1And IUW2>IWU2, it is determined that rotor is in position 2；
If IVW1>IWU1And IVU2>IUV2, it is determined that rotor is in position 3；
If IWU1>IUW1And IVU2>IUV2, it is determined that rotor is in position 4；
If IWU1>IUW1And IWV2>IVW2, it is determined that rotor is in position 5；
If IUV1>IVU1And IWV2>IVW2, it is determined that rotor is in position 6.
Optionally, collecting unit 31 according to six steps be powered the two-phase in the three-phase to motor apply pulse voltage, and
Acquisition pulse obtains specifically including when one group of current differential every time from the current differential for entering outflow two-phase：
Arbitrary two-phase into the three-phase of motor applies pulse voltage, and acquires pulse from entering outflow two-phase
Current differential；
It repeats the above process, completes to be powered to six steps of motor and current differential acquires, obtain one group of current differential.
The starter without hall electric machine that the embodiment of the present invention provides, is powered according to six steps into the three-phase of motor
Two-phase applies pulse voltage, and acquires pulse every time from the current differential for entering outflow two-phase, obtains one group of current difference
Value, this group of current differential include the corresponding current differential of six kinds of phase states during six steps are powered, above-mentioned pulse electricity
Corresponding motor starting time is pressed to be less than time constant of electric motors；Above-mentioned six steps galvanization is repeated, continues to acquire at least two groups electricity
Flow difference；Choose arbitrary two groups of current differentials；Six kinds of equilbrium positions of arbitrary two groups of current differentials and rotor are respectively required for
The condition to be met is matched, and determines the position of rotor；Start motor according to the position of rotor.Pass through in this way by
The item met needed for six kinds of positions of arbitrary two groups of measurement differences and electronics rotor in at least three groups of current differentials measured
Part is matched, and to judge the specific location of electronics rotor, the comparison for carrying out current differential is only needed, without injection
High current need not also increase additional adjunct circuit, to simplify electric machine structure, reduce the manufacturing cost of motor, improve
The service life and reliability of motor.
The above, above example are only to illustrate the technical solution of the application, rather than its limitations；Although with reference to before
Embodiment is stated the application is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of startup method of no hall electric machine, which is characterized in that including：
Apply pulse voltage according to the two-phase that six steps are powered successively into the three-phase of three phase electric machine, and it is every to acquire pulse voltage
It is secondary from the current differential for flowing out the two-phase is entered, obtain one group of current differential, one group of current differential includes described six
The corresponding current differential of six kinds of phase states during step is powered；Wherein, the corresponding motor starting time of the pulse voltage
Less than time constant of electric motors, the pulse voltage from enter flow out the two-phase current differential be the pulse voltage into
The fashionable current value for flowing through the two-phase and the pulse voltage flow through the difference between the current value of the two-phase when closing to an end
Value；
Above-mentioned six steps galvanization is repeated, continues to acquire at least one set of current differential；
Choose arbitrary two groups of current differentials；
The item met is needed when arbitrary two groups of current differentials and preset rotor are respectively at six kinds of equilbrium positions
Part is matched, and determines the position of the rotor；
Start the motor according to the position of the rotor.
2. according to the method described in claim 1, it is characterized in that, the three phase electric machine includes that the different three-phase voltage of phase is defeated
Enter end, three kinds of voltage-phases of the three phase electric machine are respectively U phases, V phases and W phases, six kinds of the rotor
Equilbrium position includes：
Position 1, the position 1 is in U phases described in the poles the N face of motor stator, and the poles S of the motor stator are by the V
Phase and the W phases are divided equally；
Position 2, the position 1 is in W phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states U phases and the V phases is divided equally；
Position 3, the position 1 is in phase V described in the poles the N face of the motor stator, and the poles S of the motor stator are by institute
It states U phases and the W phases is divided equally；
Position 4, the position 1 is in U phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states V phases and the W phases is divided equally；
Position 5, the position 1 is in W phases described in the poles the N face of the motor stator, and the poles S of the motor stator are by institute
It states U phases and the V phases is divided equally；
Position 6, the position 1 is in V phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states U phases and the W phases is divided equally.
3. if according to the method described in claim 2, it is characterized in that, first group of electric current in arbitrary two groups of current differentials
Difference is IUV1、IVU1、IUW1、IWU1、IWV1And IVW1, second group of current differential is IUV2、IVU2、IUW2、IWU2、IWV2And IVW2
When；
Six kinds of equilbrium positions by arbitrary two groups of current differentials and the rotor are respectively necessary for meeting predetermined
Condition is matched, and determines that the position of the rotor specifically includes：
If IUV1>IVU1And IUW2>IWU2, it is determined that the rotor is in position 1；
If IVW1>IWV1And IUW2>IWU2, it is determined that the rotor is in position 2；
If IVW1>IWU1And IVU2>IUV2, it is determined that the rotor is in position 3；
If IWU1>IUW1And IVU2>IUV2, it is determined that the rotor is in position 4；
If IWU1>IUW1And IWV2>IVW2, it is determined that the rotor is in position 5；
If IUV1>IVU1And IWV2>IVW2, it is determined that the rotor is in position 6.
4. according to the method described in claim 1, it is characterized in that, the two-phase being powered into the three-phase of motor according to six steps
Apply pulse voltage, and acquire pulse voltage every time from the current differential for flowing out the two-phase is entered, obtains one group of electricity
Stream difference specifically includes：
Arbitrary two-phase into the three-phase of motor applies pulse voltage, and acquires pulse voltage from entering outflow described two
The current differential of phase；
It repeats the above process, completes to be powered to six steps of the motor and current differential acquires, obtain one group of current differential.
5. method according to any one of claims 1 to 4, which is characterized in that the three phase electric machine includes that phase is different
Three kinds of voltage-phases of three-phase voltage input terminal, the three phase electric machine are respectively U phases, V phases and W phases, the motor
Six steps energization completed according to the sequence of phase UV-UW-VW-VU-WU-WV.
6. a kind of starter of no hall electric machine, which is characterized in that including：
Collecting unit, the two-phase for being powered successively into the three-phase of three phase electric machine according to six steps applies pulse voltage, and adopts
Collect pulse voltage every time from the current differential for flowing out the two-phase is entered, obtains one group of current differential, one group of electric current
Difference includes the corresponding current differential of six kinds of phase states during six step is powered；Wherein, the pulse voltage corresponds to
Motor starting time be less than time constant of electric motors, the pulse voltage is from the current differential for flowing out the two-phase is entered
The pulse voltage flows through the two-phase when closing to an end into the fashionable current value for flowing through the two-phase and the pulse voltage
Difference between current value；
The collecting unit is additionally operable to repeat above-mentioned six steps galvanization, continues to acquire at least one set of current differential；
Acquiring unit, for choosing the collected arbitrary two groups of current differentials of the collecting unit；
Determination unit, arbitrary two groups of current differentials for getting the acquiring unit are respectively at rotor
It needs the condition met to be matched when six kinds of equilbrium positions, determines the position of the rotor；
The position of start unit, the rotor for being determined according to the determination unit starts the motor.
7. device according to claim 6, which is characterized in that the three phase electric machine includes that the different three-phase voltage of phase is defeated
Enter end, three kinds of voltage-phases of the three phase electric machine are respectively U phases, V phases and W phases, six kinds of the rotor
Equilbrium position includes：
Position 1, the position 1 is in U phases described in the poles the N face of motor stator, and the poles S of the motor stator are by the V
Phase and the W phases are divided equally；
Position 2, the position 1 is in W phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states U phases and the V phases is divided equally；
Position 3, the position 1 is in V phases described in the poles the N face of the motor stator, and the poles S of the motor stator are by institute
It states U phases and the W phases is divided equally；
Position 4, the position 1 is in U phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states V phases and the W phases is divided equally；
Position 5, the position 1 is in W phases described in the poles the N face of the motor stator, and the poles S of the motor stator are by institute
It states U phases and the V phases is divided equally；
Position 6, the position 1 is in V phases described in the poles the S face of the motor stator, and the poles N of the motor stator are by institute
It states U phases and the W phases is divided equally.
8. device according to claim 7, which is characterized in that if first group of electric current in arbitrary two groups of current differentials
Difference is IUV1、IVU1、IUW1、IWU1、IWV1And IVW1, second group of current differential is IUV2、IVU2、IUW2、IWU2、IWV2And IVW2
When；
The determination unit is specifically used for：
If IUV1>IVU1And IUW2>IWU2, it is determined that the rotor is in position 1；
If IVW1>IWV1And IUW2>IWU2, it is determined that the rotor is in position 2；
If IVW1>IWU1And IVU2>IUV2, it is determined that the rotor is in position 3；
If IWU1>IUW1And IVU2>IUV2, it is determined that the rotor is in position 4；
If IWU1>IUW1And IWV2>IVW2, it is determined that the rotor is in position 5；
If IUV1>IVU1And IWV2>IVW2, it is determined that the rotor is in position 6.
9. device according to claim 6, which is characterized in that the collecting unit is being powered three to motor according to six steps
Two-phase in phase applies pulse voltage, and acquires pulse voltage every time from entering the current differential for flowing out the two-phase,
It obtains specifically including when one group of current differential：
Arbitrary two-phase into the three-phase of motor applies pulse voltage, and acquires pulse voltage from entering outflow described two
The current differential of phase；
It repeats the above process, completes to be powered to six steps of the motor and current differential acquires, obtain one group of current differential.
10. according to claim 6 to 9 any one of them device, which is characterized in that the three phase electric machine includes that phase is different
Three kinds of voltage-phases of three-phase voltage input terminal, the three phase electric machine are respectively U phases, V phases and W phases, the motor
Six steps energization completed according to the sequence of phase UV-UW-VW-VU-WU-WV.
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| US5717298A (en) * | 1995-11-28 | 1998-02-10 | Samsung Electronics Co., Ltd. | Brushless DC motor start circuit that suppresses field excitation during alternate polyphase commutation states when starting |
| CN101262196A (en) * | 2008-04-29 | 2008-09-10 | 重庆大学 | Method for detecting DC motor rotor location of no location sensor brushless |
| CN101977001A (en) * | 2010-11-02 | 2011-02-16 | 中颖电子有限公司 | Startup method and startup device of permanent magnet direct current brushless hall-less motor |
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