CN107294456A - Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium - Google Patents
Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium Download PDFInfo
- Publication number
- CN107294456A CN107294456A CN201710645717.5A CN201710645717A CN107294456A CN 107294456 A CN107294456 A CN 107294456A CN 201710645717 A CN201710645717 A CN 201710645717A CN 107294456 A CN107294456 A CN 107294456A
- Authority
- CN
- China
- Prior art keywords
- current value
- synchronous motor
- delay time
- current
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/28—Stator flux based control
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/13—Observer control, e.g. using Luenberger observers or Kalman filters
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/141—Flux estimation
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/16—Estimation of constants, e.g. the rotor time constant
Abstract
The invention discloses a kind of permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium.The present invention is by obtaining the current d-axis angle residing for the rotor of permagnetic synchronous motor, it is determined that with the current immediate normal voltage vector of d-axis angle, it regard the corresponding voltage vector direction of the normal voltage vector of determination as coordinate transform angle, resistance identification is carried out based on the coordinate transform angle, obtain the stator resistance of permagnetic synchronous motor, obtain the present current value of motor, the corresponding current delay time difference is determined using mapping curve according to the present current value, command voltage is corrected according to the current delay time difference, the stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction, so that the stator resistance and command voltage that use are more accurate, so that stator magnetic linkage is more accurate.
Description
Technical field
The present invention relates to flux observation technical field, more particularly to a kind of permanent-magnetic synchronous motor stator Flux Observation Method,
Flux observer and storage medium.
Background technology
Permagnetic synchronous motor has the advantages that efficiency high, power density are big, torque pulsation is small, speed-regulating range width, exists at present
The fields such as household electrical appliances, electric automobile, high ferro, Aero-Space are widely used.
Common frequence System of Permanent does speed generally according to speed preset signal and feedback speed signal
Spend closed-loop control, it is therefore desirable to velocity sensor acquisition speed information.However, installation rate sensor not only increases cost,
Easily break down and fail in some severe operating mode medium velocity sensors, causing the reliability of motor speed regulation system reduces.Base
In above-mentioned reason, in recent years, Speed Sensorless Control Method turns into the focus that academia is studied, and this method need not install speed
Sensor is spent, velocity information can be estimated according only to motor mathematical model.Specifically, calculated first according to stator magnetic linkage
The angle of rotor flux, then further calculates the positional information and velocity information of rotor.Therefore, the standard of stator flux observer
Exactness directly determines the degree of accuracy of motor rotor position and velocity information, the precision of final influence motor control.
Conventional permanent-magnetic synchronous motor stator Flux Observation Method has two classes：One class is according to measured current and rotor-position
Angle, stator magnetic linkage is calculated based on the mathematical modeling under two-phase synchronous rotating frame (abbreviation d-q coordinate systems), claims current-mode
Type；Another kind of is voltage, the electric current according to actual measurement, based on the mathematical modeling under two-phase rest frame (abbreviation alpha-beta coordinate system)
Stator magnetic linkage is calculated, claims voltage model.Because the rotor position angle information that current model needs is not known generally, so electric current
Model can not be used alone, in engineering, and usual sampled voltage model estimates stator magnetic linkage.
Voltage model has three input quantities, is phase voltage, phase current, stator resistance respectively, and only three input quantities are all accurate
Really, the stator magnetic linkage of output is just accurate.In actual applications, the phase current of motor generally can be detected easily, and phase
Voltage is generally difficult to detection with stator resistance.Because increase phase voltage detection circuit can increase cost and reduce reliability, engineering
It is upper not detect phase voltage generally, and use the command value Approximate Equivalent of phase voltage.Stator resistance is in motor operation course with temperature
Degree changes and changed, it usually needs real-time on-line identification or periodic off-line identification, because on-line identification method generally compares
It is more complicated, generally use offline identification method in engineering.
However, in actual applications, the output voltage of inverter can be influenceed by switch non-linearity factor and be existed certain
Deviation.Because prior art does not account for the influence of switch non-linearity factor, there is deviation in the command value and actual value of phase voltage,
There is also deviation for resistance identification result.Therefore, prior art is calculated stator magnetic linkage is simultaneously inaccurate.
The above is only used for auxiliary and understands technical scheme, does not represent and recognizes that the above is existing skill
Art.
The content of the invention
It is a primary object of the present invention to provide a kind of permanent-magnetic synchronous motor stator resistance discrimination method, motor driver and
Storage medium, it is intended to solve the big technical problem of the resistance error that recognizes in the prior art.
To achieve the above object, the present invention provides a kind of permanent-magnetic synchronous motor stator Flux Observation Method, methods described bag
Include following steps：
Obtain the current d-axis angle residing for the rotor of permagnetic synchronous motor；
It is determined that with the current immediate normal voltage vector of d-axis angle, the normal voltage vector of determination is corresponding
Voltage vector direction is used as coordinate transform angle；
Resistance identification is carried out based on the coordinate transform angle, the stator resistance of permagnetic synchronous motor is obtained；
The present current value of motor is obtained, corresponding current delay is determined using mapping curve according to the present current value
Time difference, the mapping curve is reflection delay time difference and the curve of current value corresponding relation；
Command voltage is corrected according to the current delay time difference；
The stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction.
Preferably, it is described that command voltage is corrected according to the current delay time difference, specifically include：
Terminal voltage error is calculated according to the current delay time difference；
The terminal voltage error is subjected to coordinate transform, the voltage compensation value under alpha-beta coordinate system is obtained；
Command voltage is corrected according to the voltage compensation value under the alpha-beta coordinate system.
Preferably, the permagnetic synchronous motor is calculated by following formula according to the command voltage after the stator resistance and correction
Stator magnetic linkage,
Wherein, ψα_estAnd ψβ_estFor the stator magnetic linkage of the permagnetic synchronous motor, VαAnd VβFor the command voltage after correction
Value, RsFor stator resistance, iαFor the current value of α axles, iβFor the current value of β axles.
Preferably, the present current value for obtaining motor, according to the present current value using mapping curve determination pair
The current delay time difference answered, specifically include：
The present current value of motor is obtained, the linear zone of mapping curve is searched, according to the present current value using described
Linear zone determines the corresponding current delay time difference.
It is preferably, described that the corresponding current delay time difference is determined using the linear zone according to the present current value,
Specifically include：
Two reference points are chosen from the linear zone, the reference current value of each reference point is obtained and refers to delay time
Difference, when according to the present current value, the reference current value of each reference point and determining the current delay with reference to delay time difference
Between it is poor.
Preferably, the linear zone for searching mapping curve, is specifically included：
The tangent slope of each point on the mapping curve is obtained, the linear zone is determined according to the tangent slope.
Preferably, it is described that the linear zone is determined according to the tangent slope, specifically include：
The point that tangent slope is equal to default slope is used as cut-point；
The mapping curve is split according to the cut-point, at least two cut sections are obtained；
Judge that each cut section is more than the point of default slope with the presence or absence of tangent slope, will not have tangent slope more than default
The cut section of the point of slope is used as the linear zone.
Preferably, it is described that resistance identification is carried out based on the coordinate transform angle, obtain the stator electricity of permagnetic synchronous motor
Resistance, is specifically included：
Using the coordinate transform angle as given electrical angle, pre-set current value is regard as the straight of injection permagnetic synchronous motor
Shaft current value, detects direct-axis voltage value corresponding with direct-axis current value；
The stator resistance of the permagnetic synchronous motor is calculated according to the direct-axis current value and corresponding direct-axis voltage value.
In addition, to achieve the above object, the present invention also provides a kind of motor driver, and the motor driver includes：Deposit
Reservoir, processor and it is stored in the dead area compensation program that can be run on the memory and on the processor, the dead band
The step of compensation program is arranged for carrying out described dead-zone compensation method.
In addition, to achieve the above object, the present invention also provides a kind of computer-readable recording medium, described computer-readable
Be stored with dead area compensation program on storage medium, and described dead area compensation is realized when the dead area compensation program is executed by processor
The step of method.
The present invention by obtaining the current d-axis angle residing for the rotor of permagnetic synchronous motor, it is determined that with the current d-axis
The immediate normal voltage vector of angle, regard the corresponding voltage vector direction of the normal voltage vector of determination as coordinate transform angle
Degree, resistance identification is carried out based on the coordinate transform angle, obtains the stator resistance of permagnetic synchronous motor, obtains the current of motor
Current value, determines the corresponding current delay time difference using mapping curve according to the present current value, is currently prolonged according to described
When the time difference command voltage is corrected, the permanent-magnet synchronous is calculated according to the command voltage after the stator resistance and correction
The stator magnetic linkage of motor so that the stator resistance and command voltage of use are more accurate, so that stator magnetic linkage is more accurate.
Brief description of the drawings
Fig. 1 is the flux observer structural representation for the hardware running environment that scheme of the embodiment of the present invention is related to；
Fig. 2 is the schematic flow sheet of permanent-magnetic synchronous motor stator Flux Observation Method first embodiment of the present invention；
Fig. 3 is voltage vector schematic diagram in the embodiment of the present invention；
The oscillogram of electric current and voltage when Fig. 4 recognizes for resistance in the embodiment of the present invention；
Fig. 5 is the schematic flow sheet of permanent-magnetic synchronous motor stator Flux Observation Method second embodiment of the present invention；
Fig. 6 is the schematic flow sheet of permanent-magnetic synchronous motor stator Flux Observation Method 3rd embodiment of the present invention；
Fig. 7 is delay time difference in the embodiment of the present invention with electric current, the rule schematic diagram of temperature change.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Reference picture 1, Fig. 1 is the motor driver structural representation for the hardware running environment that scheme of the embodiment of the present invention is related to
Figure.
As shown in figure 1, the motor driver can include：Processor 1001, such as CPU, communication bus 1002, Yong Hujie
Mouth 1003, memory 1004.Wherein, communication bus 1002 is used to realize the connection communication between these components.User interface
1003 can include display screen (Display), input block such as keyboard (Keyboard), and optional user interface 1003 can be with
Wireline interface, wave point including standard.Memory 1004 can be high-speed RAM memory or stable storage
Device (non-volatile memory), such as magnetic disk storage.Memory 1004 optionally can also be independently of aforementioned processing
The storage device of device 1001.
It will be understood by those skilled in the art that the motor driver structure shown in Fig. 1 is not constituted to motor driver
Restriction, can include than illustrating more or less parts, either combine some parts or different parts arrangement.
As shown in figure 1, as operating system, Yong Hujie can be included in a kind of memory 1004 of computer-readable storage medium
Mouth mold block and permanent-magnetic synchronous motor stator Flux Observation Method.
In the motor driver shown in Fig. 1, the motor driver is called in memory 1004 by processor 1001
The permanent-magnetic synchronous motor stator Flux Observation Method of storage, and perform following operate：
Obtain the current d-axis angle residing for the rotor of permagnetic synchronous motor；
It is determined that with the current immediate normal voltage vector of d-axis angle, the normal voltage vector of determination is corresponding
Voltage vector direction is used as coordinate transform angle；
Resistance identification is carried out based on the coordinate transform angle, the stator resistance of permagnetic synchronous motor is obtained；
The present current value of motor is obtained, corresponding current delay is determined using mapping curve according to the present current value
Time difference, the mapping curve is reflection delay time difference and the curve of current value corresponding relation；
Command voltage is corrected according to the current delay time difference；
The stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
Terminal voltage error is calculated according to the current delay time difference；
The terminal voltage error is subjected to coordinate transform, the voltage compensation value under alpha-beta coordinate system is obtained；
Command voltage is corrected according to the voltage compensation value under the alpha-beta coordinate system.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
The stator of the permagnetic synchronous motor is calculated by following formula according to the command voltage after the stator resistance and correction
Magnetic linkage,
Wherein, ψα_estAnd ψβ_estFor the stator magnetic linkage of the permagnetic synchronous motor, VαAnd VβFor the command voltage after correction
Value, RsFor stator resistance, iαFor the current value of α axles, iβFor the current value of β axles.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
The present current value of motor is obtained, the linear zone of mapping curve is searched, according to the present current value using described
Linear zone determines the corresponding current delay time difference.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
Two reference points are chosen from the linear zone, the reference current value of each reference point is obtained and refers to delay time
Difference, when according to the present current value, the reference current value of each reference point and determining the current delay with reference to delay time difference
Between it is poor.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
The tangent slope of each point on the mapping curve is obtained, the linear zone is determined according to the tangent slope.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
The point that tangent slope is equal to default slope is used as cut-point；
The mapping curve is split according to the cut-point, at least two cut sections are obtained；
Judge that each cut section is more than the point of default slope with the presence or absence of tangent slope, will not have tangent slope more than default
The cut section of the point of slope is used as the linear zone.
Further, processor 1001 can call the permanent-magnetic synchronous motor stator flux observation stored in memory 1004
Method, also performs following operate：
Using the coordinate transform angle as given electrical angle, pre-set current value is regard as the straight of injection permagnetic synchronous motor
Shaft current value, detects direct-axis voltage value corresponding with direct-axis current value；
The stator resistance of the permagnetic synchronous motor is calculated according to the direct-axis current value and corresponding direct-axis voltage value.
The present embodiment is by such scheme, by obtaining the current d-axis angle residing for the rotor of permagnetic synchronous motor, really
The fixed and current immediate normal voltage vector of d-axis angle, by the corresponding voltage vector side of normal voltage vector of determination
To as coordinate transform angle, resistance identification is carried out based on the coordinate transform angle, the stator electricity of permagnetic synchronous motor is obtained
Resistance, obtains the present current value of motor, the corresponding current delay time is determined using mapping curve according to the present current value
Difference, is corrected according to the current delay time difference to command voltage, according to the instruction electricity after the stator resistance and correction
Pressure calculates the stator magnetic linkage of the permagnetic synchronous motor so that the stator resistance and command voltage of use are more accurate, so that fixed
Sub- magnetic linkage is more accurate.
Based on above-mentioned hardware configuration, permanent-magnetic synchronous motor stator Flux Observation Method embodiment of the present invention is proposed.
Reference picture 2, Fig. 2 illustrates for the flow of permanent-magnetic synchronous motor stator Flux Observation Method first embodiment of the present invention
Figure.
In the first embodiment, the permanent-magnetic synchronous motor stator Flux Observation Method comprises the following steps：
S10：Obtain the current d-axis angle residing for the rotor of permagnetic synchronous motor；
It should be noted that for permagnetic synchronous motor, quadrature axis is also q axles, d-axis is also d axles, quadrature axis and d-axis
It is reference axis in essence, and not actual rotating shaft, it is similar straight in order to obtain in permagnetic synchronous motor control
The control characteristic of motor is flowed, therefore a coordinate system, this coordinate system and rotor synchronous axial system are established on rotor, takes and turns
Sub- magnetic direction is d axles, is q axles perpendicular to rotor field direction, the mathematical modeling of motor is transformed under this coordinate system, can be real
The decoupling of existing d axles and q axles, so that the characteristic that is well controlled.
It will be appreciated that the current d-axis angle can be regarded as at current time, the rotor of permagnetic synchronous motor is straight
Angle residing for axle.
S20：It is determined that with the current immediate normal voltage vector of d-axis angle, by the normal voltage vector pair of determination
The voltage vector direction answered is as coordinate transform angle；
It should be noted that reference picture 3, normal voltage vector generally has 8, it is respectively：U0(0 0 0)、U1(1 0
0)、U2(1 1 0)、U3(0 1 0)、U4(0 1 1)、U5(0 0 1)、U6(1 0 1) and U7(1 1 1)。
In the specific implementation, " d " in Fig. 3 is current d-axis angle.
It will be appreciated that the degree of approximation that generally angle can reflect between two vectors, for ease of determining to work as with described
The preceding immediate normal voltage vector of d-axis angle, can calculate the folder between the current d-axis angle and each normal voltage vector
Angle, determined further according to the angle of calculating with the current immediate normal voltage vector of d-axis angle, by the standard of determination
The corresponding voltage vector direction of voltage vector is used as coordinate transform angle.
To be further easy to determine and the current immediate normal voltage vector of d-axis angle, in the present embodiment,
When being determined according to the angle of calculating with the immediate normal voltage vector of the current d-axis angle, the angle of calculating can be entered
Row compares, and the minimum normal voltage vector of angle is defined as and the current immediate normal voltage vector of d-axis angle.
Reference picture 3, θ1、θ2The respectively angle of motor rotor position and adjacent modular voltage vector, with θ1Less than θ2For
Example, now, can be by voltage vector U1(1 0 0) as with the current immediate normal voltage vector of d-axis angle, therefore,
Can be by the normal voltage vector U of determination10 ° of (1 0 0) corresponding voltage vector direction is used as coordinate transform angle.
It should be noted that for ease of regarding the corresponding voltage vector direction of the normal voltage vector of determination as coordinate transform
In angle, the present embodiment, the corresponding voltage vector direction of normal voltage vector of determination can be first searched, and by the voltage found
Direction vector is used as the coordinate transform angle.
For ease of searching the voltage vector direction, a mapping relations can be pre-established, the mapping relations include
Corresponding relation between normal voltage vector voltage vector direction, therefore, can search the standard electric of determination in mapping relations
Press the corresponding voltage vector direction of vector.
S30：Resistance identification is carried out based on the coordinate transform angle, the stator resistance of permagnetic synchronous motor is obtained；
, can be using the coordinate transform angle as given electrical angle in the present embodiment for ease of realizing that resistance is recognized, will be pre-
If current value is used as the direct-axis current value of injection permagnetic synchronous motor, detection and the corresponding direct-axis voltage of direct-axis current value
Value；The stator resistance of the permagnetic synchronous motor is calculated according to the direct-axis current value and corresponding direct-axis voltage value.
It should be noted that for permagnetic synchronous motor, quadrature axis is also q axles, d-axis is also d axles, quadrature axis and d-axis
It is reference axis in essence, and not actual rotating shaft, it is similar straight in order to obtain in permagnetic synchronous motor control
The control characteristic of motor is flowed, therefore a coordinate system, this coordinate system and rotor synchronous axial system are established on rotor, takes and turns
Sub- magnetic direction is d axles, is q axles perpendicular to rotor field direction, the mathematical modeling of motor is transformed under this coordinate system, can be real
The decoupling of existing d axles and q axles, so that the characteristic that is well controlled.
It will be appreciated that the influence in order to offset delay time difference, so, it is necessary to carry out the injection of current value twice, because
This, can obtain two pre-set current values in the present embodiment, be made a distinction for ease of the pre-set current value to acquisition, can be by acquisition
Pre-set current value is divided into the first pre-set current value and the second pre-set current value.
Correspondingly, it is described using the coordinate transform angle as given electrical angle, pre-set current value is used as to injection permanent magnetism
The direct-axis current value of synchronous motor, detects direct-axis voltage value corresponding with direct-axis current value, may particularly include：
Using the coordinate transform angle as given electrical angle, using the first pre-set current value as the first direct-axis current value,
Closed-loop control is carried out to the first direct-axis current value, when feedback direct-axis current value and the first direct-axis current value one of closed-loop control
During cause, DC voltage value is obtained, and using the DC voltage value of acquisition as straight with the first direct-axis current value corresponding first
Shaft voltage value；
Using the coordinate transform angle as given electrical angle, using the second pre-set current value as the second direct-axis current value,
Closed-loop control is carried out to the second direct-axis current value, when feedback direct-axis current value and the second direct-axis current value one of closed-loop control
During cause, DC voltage value is obtained, and using the DC voltage value of acquisition as straight with the second direct-axis current value corresponding second
Shaft voltage value.
It will be appreciated that realized due to closed-loop control typically using feedback ratio compared with by the way of, so, it usually needs it is certain
Time setting value (i.e. the first direct-axis current value or the second direct-axis current value) and value of feedback (is fed back direct-axis current
Value) unanimously, but assume when setting value and value of feedback be not also consistent, that is, to gather DC voltage value, the resistance of identification can be caused to miss
Difference is excessive, therefore, in the present embodiment, when setting value is consistent with value of feedback, just obtains DC voltage value.
, can according to the direct-axis current value and correspondingly in the present embodiment in the specific implementation, for ease of improving computational efficiency
Direct-axis voltage value the stator resistance of the permagnetic synchronous motor is calculated by following formula,
Wherein, RsFor the stator resistance of the permagnetic synchronous motor, Vd1For the first direct-axis voltage value, Vd2For the second d-axis electricity
Pressure value, id1For the first direct-axis current value, id2For the second direct-axis current value.
Specifically, when carrying out resistance identification, the oscillogram of electric current and voltage can refer to Fig. 4.
S40：The present current value of motor is obtained, is determined according to the present current value using mapping curve corresponding current
Delay time is poor, and the mapping curve is reflection delay time difference and the curve of current value corresponding relation；
It should be noted that the present current value is the electricity for flowing through switching tube on motor inverter bridge arm current time
Flow valuve.
It will be appreciated that the present current value can be obtained, such as in several ways：Can using current sensor come
The present current value is obtained, the present current value can be also obtained using current detecting chip, the present embodiment is not added with to this
To limit.
For ease of determining the current delay time difference, test of many times test can be carried out, so that mapping curve is obtained, it is described
Mapping curve is reflection delay time difference and the curve of current value corresponding relation, and therefore, in the present embodiment, step S50 can basis
The present current value determines the corresponding current delay time difference using mapping curve.
It should be noted that delay time difference is shut-off delay time and the difference for opening delay time, calculation formula
Δ t can be useddelay=tturn_off_delay-tturn_on_delay, wherein, Δ tdelayIt is poor for delay time, tturn_off_delayFor shut-off
Delay time, tturn_on_delayTo open delay time.
S50：Command voltage is corrected according to the current delay time difference；
S60：The stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction.
The present embodiment by obtaining the current d-axis angle residing for the rotor of permagnetic synchronous motor, it is determined that with it is described current straight
The immediate normal voltage vector of shaft angle degree, regard the corresponding voltage vector direction of the normal voltage vector of determination as coordinate transform
Angle, resistance identification is carried out based on the coordinate transform angle, obtains the stator resistance of permagnetic synchronous motor, obtains working as motor
Preceding current value, the corresponding current delay time difference is determined according to the present current value using mapping curve, according to described current
Delay time difference is corrected to command voltage, and it is same to calculate the permanent magnetism according to the command voltage after the stator resistance and correction
Walk the stator magnetic linkage of motor so that the stator resistance and command voltage of use are more accurate, so that stator magnetic linkage is more accurate.
Further, as shown in figure 5, proposing permanent-magnetic synchronous motor stator flux observation side of the present invention based on first embodiment
Method second embodiment.
In the present embodiment, step S50 is specifically included：
S51：Terminal voltage error is calculated according to the current delay time difference；
It will be appreciated that because the motor in the present embodiment is three-phase variable frequency motor, and the frequency converter of three-phase variable frequency motor
Each phase can have bridge arm, and each bridge arm has upper switching tube and lower switching tube respectively, so, for the bridge arm in each phase
Speech, respectively with present current value, and separate between the present current value of each phase, does not interfere with each other, therefore, each phase it is current
Above-mentioned formula can be respectively adopted according to the present current value of each phase and calculate the corresponding current delay time difference for current value, so, root
, can be by delay time error converting into terminal voltage error, referring in particular to as follows according to voltagesecond product equal principle in a switch periods
Formula：
Wherein,ia
For the present current value of a phases, ibFor the present current value of b phases, icFor the present current value of c phases, Δ tdelay(ia) it is iaIt is corresponding
Current delay time difference, Δ tdelay(ib) it is ibCorresponding current delay time difference, Δ tdelay(ic) it is icCorresponding current delay
Time difference, tsFor the switch periods of the three-phase variable frequency motor, VdcFor DC bus-bar voltage, Δ vAN_delay(ia) be a phases end
Voltage error, Δ vBN_delay(ib) be b phases terminal voltage error, Δ vCN_delay(ic) be c phases terminal voltage error.
S52：The terminal voltage error is subjected to coordinate transform, the voltage compensation value under alpha-beta coordinate system is obtained；
In the specific implementation, can by following formula carry out coordinate transform,
Wherein, Vα_compFor the voltage compensation value of α axles, Vβ_compFor the voltage compensation value of β axles.
S53：Command voltage is corrected according to the voltage compensation value under the alpha-beta coordinate system.
It will be appreciated that obtaining after voltage compensation value, you can command voltage is corrected according to the voltage compensation value,
It will not be repeated here.
, can be according to the command voltage after the stator resistance and correction for ease of calculating in the stator magnetic linkage, step S70
The stator magnetic linkage of the permagnetic synchronous motor is calculated by following formula,
Wherein, ψα_estAnd ψβ_estFor the stator magnetic linkage of the permagnetic synchronous motor, VαAnd VβFor the command voltage after correction
Value, RsFor stator resistance, iαFor the current value of α axles, iβFor the current value of β axles.
Further, as shown in fig. 6, proposing that permagnetic synchronous motor of the present invention is determined based on first embodiment or second embodiment
Sub- Flux Observation Method 3rd embodiment, Fig. 6 is exemplified by based on the embodiment shown in Fig. 2.
In the present embodiment, step S40 is specifically included：
S40’：The present current value of motor is obtained, the linear zone of mapping curve is searched, is used according to the present current value
The linear zone determines the corresponding current delay time difference.
It will be appreciated that due to there may be the faster inelastic region of amplitude of variation in the mapping curve, according to non-
Linear zone determines the current delay time difference, and the current delay time difference obtained can be caused can not to ensure precision, therefore, this reality
Apply in example and the corresponding current delay time difference is determined using the linear zone according to the present current value, so as to improve current
The acquisition precision of delay time difference.
In the specific implementation, current delay corresponding with the present current value can be searched directly in the linear zone
Time difference, but consider to obtain in the efficiency of current delay time difference, the present embodiment, two can be chosen from the linear zone
Reference point, obtain the reference current value of each reference point and poor with reference to delay time, according to the present current value, each reference point
Reference current value and reference delay time difference determine the current delay time difference.
It will be appreciated that because the amplitude of variation of the linear zone is generally relatively slow, so, its tangent slope is generally smaller,
For ease of searching in the linear zone in the mapping curve, the present embodiment, the tangent line that can obtain each point on the mapping curve is oblique
Rate, the linear zone is determined according to the tangent slope.
To be realized to the linear zone in quick lookup, the present embodiment, the point that tangent slope can be equal to default slope is made
For cut-point；The mapping curve is split according to the cut-point, at least two cut sections are obtained；Judge each cut section
Be more than the point of default slope with the presence or absence of tangent slope, using do not exist tangent slope be more than default slope point cut section as
The linear zone.
It should be noted that there may be larger current value in the linear zone determined in step S40 ', arrived if chosen
Excessive current value may damage permagnetic synchronous motor, and or damage part with permagnetic synchronous motor motor connection, be
Prevent in the problem, the present embodiment, a predetermined current threshold can be set, delete and exceed predetermined current in the linear zone
The region of threshold value.
It will be appreciated that for the predetermined current threshold, can be configured by experience, also can be according to multiple examination
Test and be configured, but there may be different resistance to current characteristics in view of different permagnetic synchronous motors, therefore, in the present embodiment,
The predetermined current threshold can be set to current maxima and the permagnetic synchronous motor that the permagnetic synchronous motor allows
Smaller value in the current maxima that institute's connection frequency converter allows.
Reference picture 7, according to experimental results can the computation delay time difference, it can be seen from result of calculation, delay time is poor
With shown in solid in electric current, the rule of temperature change such as Fig. 7, the abscissa in figure is current value, and ordinate is that delay time is poor.
According to rule in Fig. 7, in order to simplify calculating, the influence of temperature change can be ignored, the shadow of curent change is only considered
Ring, therefore, temperature can choose a fixed value T0, the T in implementing0It can be configured as needed, such as in fixed value T0
For 60 DEG C when, T0=60 DEG C of corresponding curves are the mapping curve, correspondingly, and the Blocked portion in Fig. 7 is described reflects
Penetrate the linear zone of curve, correspondingly, in the present embodiment, can according to the present current value, the reference current value of each reference point and
The current delay time difference is determined by following formula with reference to delay time difference,
Wherein, i is present current value, Δ tdelay(i) it is current delay time difference, t (i1,T0) it is reference current value i1It is right
The reference delay time answered is poor, t (i2,T0) it is reference current value i2Corresponding reference delay time is poor, T0For preset temperature value.
It should be noted that the dotted line in Fig. 7 is to calculate acquisition respectively to each current value in square frame according to above-mentioned formula
Delay time it is poor, it will be understood that, the present current value needs to be also required to be in the linear zone just use above-mentioned
Formula accurately calculates the current delay time difference, if present current value is not in linear zone, needs using other modes come really
Settled preceding delay time is poor, for example：Determined by carrying out the modes such as correspondence lookup directly from the mapping curve, certainly,
Other modes can be also used, the present embodiment is not any limitation as to this.
In addition, the embodiment of the present invention also proposes a kind of computer-readable recording medium, the computer-readable recording medium
On be stored with permanent-magnetic synchronous motor stator flux observation program, the permanent-magnetic synchronous motor stator flux observation program is by processor
Following operation is realized during execution：
Obtain the current d-axis angle residing for the rotor of permagnetic synchronous motor；
It is determined that with the current immediate normal voltage vector of d-axis angle, the normal voltage vector of determination is corresponding
Voltage vector direction is used as coordinate transform angle；
Resistance identification is carried out based on the coordinate transform angle, the stator resistance of permagnetic synchronous motor is obtained；
The present current value of motor is obtained, corresponding current delay is determined using mapping curve according to the present current value
Time difference, the mapping curve is reflection delay time difference and the curve of current value corresponding relation；
Command voltage is corrected according to the current delay time difference；
The stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
Terminal voltage error is calculated according to the current delay time difference；
The terminal voltage error is subjected to coordinate transform, the voltage compensation value under alpha-beta coordinate system is obtained；
Command voltage is corrected according to the voltage compensation value under the alpha-beta coordinate system.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
The stator of the permagnetic synchronous motor is calculated by following formula according to the command voltage after the stator resistance and correction
Magnetic linkage,
Wherein, ψα_estAnd ψβ_estFor the stator magnetic linkage of the permagnetic synchronous motor, VαAnd VβFor the command voltage after correction
Value, RsFor stator resistance, iαFor the current value of α axles, iβFor the current value of β axles.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
The present current value of motor is obtained, the linear zone of mapping curve is searched, according to the present current value using described
Linear zone determines the corresponding current delay time difference.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
Two reference points are chosen from the linear zone, the reference current value of each reference point is obtained and refers to delay time
Difference, when according to the present current value, the reference current value of each reference point and determining the current delay with reference to delay time difference
Between it is poor.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
The tangent slope of each point on the mapping curve is obtained, the linear zone is determined according to the tangent slope.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
The point that tangent slope is equal to default slope is used as cut-point；
The mapping curve is split according to the cut-point, at least two cut sections are obtained；
Judge that each cut section is more than the point of default slope with the presence or absence of tangent slope, will not have tangent slope more than default
The cut section of the point of slope is used as the linear zone.
Further, following behaviour is also realized when the permanent-magnetic synchronous motor stator flux observation program is executed by processor
Make：
Using the coordinate transform angle as given electrical angle, pre-set current value is regard as the straight of injection permagnetic synchronous motor
Shaft current value, detects direct-axis voltage value corresponding with direct-axis current value；
The stator resistance of the permagnetic synchronous motor is calculated according to the direct-axis current value and corresponding direct-axis voltage value.
The present embodiment is by such scheme, by obtaining the current d-axis angle residing for the rotor of permagnetic synchronous motor, really
The fixed and current immediate normal voltage vector of d-axis angle, by the corresponding voltage vector side of normal voltage vector of determination
To as coordinate transform angle, resistance identification is carried out based on the coordinate transform angle, the stator electricity of permagnetic synchronous motor is obtained
Resistance, obtains the present current value of motor, the corresponding current delay time is determined using mapping curve according to the present current value
Difference, is corrected according to the current delay time difference to command voltage, according to the instruction electricity after the stator resistance and correction
Pressure calculates the stator magnetic linkage of the permagnetic synchronous motor so that the stator resistance and command voltage of use are more accurate, so that fixed
Sub- magnetic linkage is more accurate.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property is included, so that process, method, article or system including a series of key elements not only include those key elements, and
And also including other key elements being not expressly set out, or also include for this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Also there is other identical element in process, method, article or the system of key element.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Understood based on such, technical scheme is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone,
Computer, server, air conditioner, or network equipment etc.) perform method described in each of the invention embodiment.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of permanent-magnetic synchronous motor stator Flux Observation Method, it is characterised in that the described method comprises the following steps：
Obtain the current d-axis angle residing for the rotor of permagnetic synchronous motor；
It is determined that with the current immediate normal voltage vector of d-axis angle, by the corresponding voltage of normal voltage vector of determination
Direction vector is used as coordinate transform angle；
Resistance identification is carried out based on the coordinate transform angle, the stator resistance of permagnetic synchronous motor is obtained；
The present current value of motor is obtained, the corresponding current delay time is determined using mapping curve according to the present current value
Difference, the mapping curve is reflection delay time difference and the curve of current value corresponding relation；
Command voltage is corrected according to the current delay time difference；
The stator magnetic linkage of the permagnetic synchronous motor is calculated according to the command voltage after the stator resistance and correction.
2. the method as described in claim 1, it is characterised in that described to be entered according to the current delay time difference to command voltage
Row correction, is specifically included：
Terminal voltage error is calculated according to the current delay time difference；
The terminal voltage error is subjected to coordinate transform, the voltage compensation value under alpha-beta coordinate system is obtained；
Command voltage is corrected according to the voltage compensation value under the alpha-beta coordinate system.
3. method as claimed in claim 2, it is characterised in that passed through according to the command voltage after the stator resistance and correction
Following formula calculates the stator magnetic linkage of the permagnetic synchronous motor,
<mrow>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>&psi;</mi>
<mrow>
<mi>&alpha;</mi>
<mo>_</mo>
<mi>e</mi>
<mi>s</mi>
<mi>t</mi>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>&psi;</mi>
<mrow>
<mi>&beta;</mi>
<mo>_</mo>
<mi>e</mi>
<mi>s</mi>
<mi>t</mi>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<mrow>
<mo>&Integral;</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>V</mi>
<mi>&alpha;</mi>
</msub>
<mo>-</mo>
<msub>
<mi>R</mi>
<mi>s</mi>
</msub>
<msub>
<mi>i</mi>
<mi>&alpha;</mi>
</msub>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>&Integral;</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>V</mi>
<mi>&beta;</mi>
</msub>
<mo>-</mo>
<msub>
<mi>R</mi>
<mi>s</mi>
</msub>
<msub>
<mi>i</mi>
<mi>&beta;</mi>
</msub>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein, ψα_estAnd ψβ_estFor the stator magnetic linkage of the permagnetic synchronous motor, VαAnd VβFor the command voltage value after correction, Rs
For stator resistance, iαFor the current value of α axles, iβFor the current value of β axles.
4. such as method according to any one of claims 1 to 3, it is characterised in that the present current value of the acquisition motor, root
The corresponding current delay time difference is determined using mapping curve according to the present current value, specifically included：
The present current value of motor is obtained, the linear zone of mapping curve is searched, according to the present current value using described linear
Area determines the corresponding current delay time difference.
5. method as claimed in claim 4, it is characterised in that described true using the linear zone according to the present current value
The fixed corresponding current delay time difference, specifically include：
Two reference points are chosen from the linear zone, the reference current value and poor, the root with reference to delay time of each reference point is obtained
The current delay time difference is determined according to the present current value, the reference current value of each reference point and with reference to delay time difference.
6. method as claimed in claim 4, it is characterised in that the linear zone of the lookup mapping curve, is specifically included：
The tangent slope of each point on the mapping curve is obtained, the linear zone is determined according to the tangent slope.
7. method as claimed in claim 6, it is characterised in that described that the linear zone is determined according to the tangent slope, tool
Body includes：
The point that tangent slope is equal to default slope is used as cut-point；
The mapping curve is split according to the cut-point, at least two cut sections are obtained；
Judge that each cut section is more than the point of default slope with the presence or absence of tangent slope, will not have tangent slope and be more than default slope
The cut section of point be used as the linear zone.
8. such as method according to any one of claims 1 to 3, it is characterised in that described to be entered based on the coordinate transform angle
Row resistance is recognized, and is obtained the stator resistance of permagnetic synchronous motor, is specifically included：
It is using the coordinate transform angle as given electrical angle, the d-axis of pre-set current value as injection permagnetic synchronous motor is electric
Flow valuve, detects direct-axis voltage value corresponding with direct-axis current value；
The stator resistance of the permagnetic synchronous motor is calculated according to the direct-axis current value and corresponding direct-axis voltage value.
9. a kind of motor driver, it is characterised in that the motor driver includes：Memory, processor and it is stored in described
On memory and the dead area compensation program that can run on the processor, the dead area compensation program is arranged for carrying out such as right
It is required that the step of dead-zone compensation method any one of 1 to 8.
10. a kind of computer-readable recording medium, it is characterised in that be stored with dead band benefit on the computer-readable recording medium
Program is repaid, the dead area compensation as any one of claim 1 to 8 is realized when the dead area compensation program is executed by processor
The step of method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710645717.5A CN107294456B (en) | 2017-07-31 | 2017-07-31 | Permanent magnet synchronous motor stator flux linkage observation method, flux linkage observer and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710645717.5A CN107294456B (en) | 2017-07-31 | 2017-07-31 | Permanent magnet synchronous motor stator flux linkage observation method, flux linkage observer and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107294456A true CN107294456A (en) | 2017-10-24 |
| CN107294456B CN107294456B (en) | 2020-02-11 |
Family
ID=60104482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710645717.5A Active CN107294456B (en) | 2017-07-31 | 2017-07-31 | Permanent magnet synchronous motor stator flux linkage observation method, flux linkage observer and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107294456B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289894A (en) * | 2018-12-10 | 2020-06-16 | 广东威灵汽车部件有限公司 | Locked rotor detection method, system and device of motor and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928672A (en) * | 2012-10-26 | 2013-02-13 | 南车株洲电力机车研究所有限公司 | Method for realizing resistance measurement of asynchronous motor fixed rotor |
| WO2013105187A1 (en) * | 2012-01-12 | 2013-07-18 | パナソニック株式会社 | Inverter control device |
| CN103731082A (en) * | 2014-01-03 | 2014-04-16 | 东南大学 | Stator flux linkage estimation method of permanent magnet synchronous motor based on direct torque control |
| CN106533295A (en) * | 2016-12-21 | 2017-03-22 | 阳光电源股份有限公司 | Method and device for position sensorless control of permanent magnet synchronous motor |
-
2017
- 2017-07-31 CN CN201710645717.5A patent/CN107294456B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013105187A1 (en) * | 2012-01-12 | 2013-07-18 | パナソニック株式会社 | Inverter control device |
| CN102928672A (en) * | 2012-10-26 | 2013-02-13 | 南车株洲电力机车研究所有限公司 | Method for realizing resistance measurement of asynchronous motor fixed rotor |
| CN103731082A (en) * | 2014-01-03 | 2014-04-16 | 东南大学 | Stator flux linkage estimation method of permanent magnet synchronous motor based on direct torque control |
| CN106533295A (en) * | 2016-12-21 | 2017-03-22 | 阳光电源股份有限公司 | Method and device for position sensorless control of permanent magnet synchronous motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289894A (en) * | 2018-12-10 | 2020-06-16 | 广东威灵汽车部件有限公司 | Locked rotor detection method, system and device of motor and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107294456B (en) | 2020-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6567282B1 (en) | Apparatus and method of sensorless control for synchronous generator | |
| US6414462B2 (en) | Speed control apparatus for synchronous reluctance motor | |
| JP4578700B2 (en) | Brushless DC motor control device | |
| EP3557755B1 (en) | Method for testing initial position angle of electric motor rotor | |
| EP3014760B1 (en) | System and method of rotor time constant online identification in an ac induction machine | |
| US10333439B2 (en) | Methods of estimating a position of a rotor in a motor under transient and systems thereof | |
| CN110943660B (en) | Synchronous motor inductance detection method and device | |
| KR101619567B1 (en) | Apparatus for estimating parameters in induction machine | |
| CN109802617B (en) | Control method, device and system of driving motor | |
| CN107248831A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN110729703A (en) | Locked rotor protection method based on FOC motor control and motor control device | |
| Chatterjee | A simple leakage inductance identification technique for three-phase induction machines under variable flux condition | |
| CN107294457A (en) | Permanent-magnetic synchronous motor stator resistance discrimination method, motor driver and storage medium | |
| CN107241045A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107294456A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107294454A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107404269A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107332489A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107404270A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107294458A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| CN107294455A (en) | Permanent-magnetic synchronous motor stator Flux Observation Method, flux observer and storage medium | |
| JP5288957B2 (en) | Electric motor control device with resistance compensation function | |
| CN112564572A (en) | Permanent magnet synchronous motor rotor position detection system and method based on current bias | |
| CN112583320B (en) | Permanent magnet synchronous motor rotor position detection system and method based on voltage decoupling | |
| CN111431455A (en) | Permanent magnet synchronous electric main shaft vector control method based on maximum torque current ratio control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |