CN107147346A - Power conversion control device - Google Patents
Power conversion control device Download PDFInfo
- Publication number
- CN107147346A CN107147346A CN201710597303.XA CN201710597303A CN107147346A CN 107147346 A CN107147346 A CN 107147346A CN 201710597303 A CN201710597303 A CN 201710597303A CN 107147346 A CN107147346 A CN 107147346A
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- Prior art keywords
- shaft
- value
- command value
- ref
- voltage
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/045—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
Abstract
The embodiment of the present invention proposes a kind of power conversion control device, is related to variable-frequency driving technique field.The power conversion control device gives unit by q shaft voltages command value and d shaft voltages command value gives the supply voltage that unit is received according to circuit parameter receiving unit respectively, busbar voltage, input to the phase current and presetting motor speed reference value of motor and calculate after q shaft voltages command value and d shaft voltage command values, pwm unit is again according to q shaft voltages command value and d shaft voltages command value generation pulse-width signal, so as at alternating voltage peak, controlled motor exports larger power, and near alternating voltage zero-crossing point, controlled motor exports smaller power, so that input current waveform is smaller near alternating voltage zero-crossing point, reduce current harmonics, increase power factor, also so that the operating efficiency of motor is enhanced.
Description
Technical field
The present invention relates to variable-frequency driving technique field, in particular to a kind of power conversion control device.
Background technology
Compressor is a kind of driven fluid machinery that low-pressure gas is promoted to gases at high pressure, and compressor operating needs
The drive of motor.
In the prior art, the power that motor absorbs is the power and alternating voltage at firm power, alternating voltage peak
Near zero-crossing point power indifference, and near zero-crossing point because Aiternating Current Voltage Ratio is relatively low, therefore zero crossing goes to capital electric current to compare
Greatly, so as to cause AC input current not to be sinusoidal waveform, power factor is relatively low, and harmonic current causes compression electromechanical than larger
The inefficiency of machine.
The content of the invention
It is an object of the invention to provide a kind of power conversion control device, to reduce harmonic current, power factor is improved.
To achieve these goals, the technical scheme that the embodiment of the present invention is used is as follows：
The embodiments of the invention provide a kind of power conversion control device, for controlling drive circuit to be transported with drive motor
Turn, the power conversion control device includes：
Circuit parameter receiving unit, for receiving supply voltage that a circuit parameter Acquisition Circuit sends, busbar voltage, defeated
Enter to the phase current of motor；
Q shaft voltages command value gives unit, for turning according to the supply voltage, the phase current and presetting motor
Fast reference value calculates q shaft voltage command values；
D shaft voltages command value gives unit, for calculating the instruction of d shaft voltages according to the busbar voltage, the phase current
Value；
Pwm unit, for according to the q shaft voltages command value and d shaft voltages command value generation pulsewidth modulation
Signal, and control the drive circuit to drive the motor operating according to the pulse-width signal.
Further, the q shaft voltages command value gives unit and included：Mean power reference value determination subelement, is used for
Mean power reference value is calculated according to the presetting motor speed reference value and the phase current；
Value and power reference determination subelement, for calculating power according to the mean power reference value and the supply voltage
Reference value；
Q shaft current reference value determination subelements, for calculating q shaft currents according to the value and power reference and the phase current
Reference value；
Q shaft voltage command value determination subelements, for calculating described according to the q shaft currents reference value and the phase current
Q shaft voltage command values.
Further, the mean power reference value determination subelement is used to calculate motor speed reality according to the phase current
Actual value, and pass through formula Pavr_Ref=Kp1*(ωr_Ref-ωr)+Ki1*∫(ωr_Ref-ωr) the dt calculating mean power reference
Value, wherein, Pavr_RefFor mean power reference value, ωr_RefFor motor speed reference value, ωrFor motor speed actual value, Kp1For
The first presetting proportionality coefficient, Ki1For presetting first integral coefficient.
Further, the value and power reference determination subelement is used for by by the mean power reference value and the electricity
Square multiplication of source voltage, so as to obtain the value and power reference.
Further, the q shaft currents reference value determination subelement is used to pass through formulaMeter
The q shaft currents reference value is calculated, wherein, iq_RefFor q shaft current reference values, PRefFor value and power reference, Ud is d axle current voltages,
Uq is q axle current voltages, idFor d shaft currents.
Further, the q shaft voltages command value determination subelement is used to pass through formula uq=Kp2*(iq_Ref-iq)+Ki2*∫
(iq_Ref-iq) the dt calculating q shaft voltages command value, wherein, uqFor q shaft voltage command values, iq_RefFor q shaft current reference values,
iqFor q shaft currents, Kp2For the second presetting proportionality coefficient, Ki2For presetting second integral coefficient.
Further, the d shaft voltages command value gives unit and included：
D shaft current reference value determination subelements, for calculating d shaft currents ginseng according to the phase current and the busbar voltage
Examine value；
D shaft voltage command value determination subelements, for calculating described according to the d shaft currents reference value and the phase current
D shaft voltage command values.
Further, the d shaft currents reference value determination subelement is used to pass through formula
The d shaft currents reference value is calculated, wherein,η is presetting voltage utilization, udcFor busbar voltage, Iq
For presetting q shaft current specified rates, ωrFor motor speed actual value, ψ is the rotor permanent magnet magnetic linkage of motor, and Ld is d axles electricity
Sense.
Further, formula is passed throughThe motor speed actual value is calculated, wherein, the θ is motor
The angle of rotor permanent magnet magnetic linkage.
Further, the d shaft voltages command value determination subelement is used to pass through formula ud=Kp3 *(id_Ref-id)+Ki3 *∫
(id_Ref-id) the dt calculating d shaft voltages command value, wherein, udFor d shaft voltage command values, id_RefFor d shaft current reference values,
idFor d shaft currents, Kp3For the 3rd presetting proportionality coefficient, Ki3For presetting third integral coefficient.
Power conversion control device provided in an embodiment of the present invention, unit and d shaft voltages are given by q shaft voltages command value
Command value gives unit respectively according to the supply voltage of circuit parameter receiving unit reception, busbar voltage, the phase of input to motor
Electric current and presetting motor speed reference value are calculated after q shaft voltages command value and d shaft voltage command values, pulsewidth modulation list
Member is again according to q shaft voltages command value and d shaft voltages command value generation pulse-width signal, at alternating voltage peak, to control
Motor processed exports larger power, and near alternating voltage zero-crossing point, controlled motor output smaller power, so that input
Current waveform is smaller near alternating voltage zero-crossing point, reduces current harmonics, increases power factor, also causes the work of motor
It is enhanced as efficiency.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1, which is shown, can apply the circuit diagram of power conversion control device provided in an embodiment of the present invention.
Fig. 2 shows the functional block diagram of power conversion control device provided in an embodiment of the present invention.
Fig. 3 shows the topology diagram of power conversion control device provided in an embodiment of the present invention.
Fig. 4 shows that q shaft voltages command value provided in an embodiment of the present invention gives the functional block diagram of unit.
Fig. 5 shows that d shaft voltages command value provided in an embodiment of the present invention gives the functional block diagram of unit.
Icon：100- power conversion control devices；110- circuit parameter receiving units；120-q shaft voltages command value gives
Unit；122- mean power reference value determination subelements；124- value and power reference determination subelements；126-q shaft current reference values
Determination subelement；128-q shaft voltage command value determination subelements；130-d shaft voltages command value gives unit；132-d shaft currents
Reference value determination subelement；134-d shaft voltage command value determination subelements；140- pwm units.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and designed with a variety of configurations herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.Meanwhile, the present invention's
In description, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
Embodiment
The embodiments of the invention provide a kind of power conversion control device 100, for controlling drive circuit with drive motor
Operating, so as to realize the size of the change controlled motor power output according to alternating voltage.Referring to Fig. 1, showing to apply
The circuit diagram of power conversion control device 100.It is to be appreciated that control module becomes comprising the power that the embodiment of the present invention is provided
Change control device 100.
Referring to Fig. 2, the power conversion control device 100 includes circuit parameter receiving unit 110, q shaft voltage command values
Given unit 120, d shaft voltages command value give unit 130 and pwm unit 140.Referring to Fig. 3, the power conversion
Control device 100 is used to be controlled motor by topology diagram as shown in Figure 3.
Wherein, circuit parameter receiving unit 110 is used to receive supply voltage, the bus that a circuit parameter Acquisition Circuit is sent
Voltage, the phase current of input to motor.
Q shaft voltages command value, which gives unit 120, to be used for according to supply voltage, phase current and presetting motor speed reference
Value calculates q shaft voltage command values.
Specifically, referring to Fig. 4, q shaft voltages command value, which gives unit 120, includes mean power reference value determination subelement
122nd, value and power reference determination subelement 124, q shaft current reference values determination subelement 126 and q shaft voltages command value determine son
Unit 128.
Flat value and power reference determination subelement 122 is used to calculate flat according to presetting motor speed reference value and phase current
Equal value and power reference.Specifically, mean power reference value determination subelement 122 is according to presetting motor speed reference value and phase
The process of Current calculation mean power reference value is as follows：
First, motor speed actual value is calculated according to phase current, its process is as follows：
Pass through u phase currents iuAnd v phase currents ivCalculate w phase currents iw：
iw=-iu-iv
And pass through u phase currents iu, v phase currents ivAnd w phase currents iwCalculate α shaft currents and β shaft currents, the following institute of formula
Show：
iα=iu
Then the calculation formula of q shaft currents is：
iq=iβcosθ-iαsinθ
The calculation formula of d shaft currents is：
id=iαcosθ+iβsinθ
Wherein, θ is the angle of rotor permanent magnet flux linkage, can be drawn by traditional position estimation algorithm, and it is calculated
Process is as follows：
It is first depending on d axis components and q axis components that following formula calculate counter electromotive force：
Wherein, estimated angle and the error of actual angle
Then the angle of rotor permanent magnet flux linkage is calculated by following formula：
θ (n)=θ (n-1)+Δ θ
Then, motor speed actual value ωrFor：
Secondly, according to presetting motor speed reference value and motor speed calculated with actual values mean power reference value
Pavr_Ref, its calculation formula is as follows：
Pavr_Ref=Kp1 *(ωr_Ref-ωr)+Ki1 *∫(ωr_Ref-ωr)dt
Wherein, Pavr_RefFor mean power reference value, ωr_RefFor motor speed reference value, ωrIt is actual for motor speed
Value, Kp1For the first presetting proportionality coefficient, Ki1For presetting first integral coefficient.
Value and power reference determination subelement 124 is used to calculate power reference according to mean power reference value and supply voltage
Value.Specifically, value and power reference determination subelement 124 can be calculated value and power reference by following formula：
PRef=Pavr_Ref*uac*uac
Wherein, uacFor supply voltage.
Q shaft current reference values determination subelement 126 is used to calculate the reference of q shaft currents according to value and power reference and phase current
Value.Specifically, q shaft currents reference value determination subelement 126 can be calculated q shaft current reference values by following formula：
Wherein, iq_RefFor q shaft current reference values, PRefFor value and power reference, Ud is d axle current voltages, and Uq is that q axles are current
Voltage, idFor d shaft currents.
Q shaft voltage command values determination subelement 128 is used to refer to according to q shaft currents reference value and phase current calculating q shaft voltages
Make value.Specifically, q shaft voltages command value determination subelement 128 can be calculated q shaft voltage command values by following formula：
uq=Kp2 *(iq_Ref-iq)+Ki2 *∫(iq_Ref-iq)dt
Wherein, uqFor q shaft voltage command values, iq_RefFor q shaft current reference values, iqFor q shaft currents, Kp2For presetting
Two proportionality coefficients, Ki2For presetting second integral coefficient.
D shaft voltages command value, which gives unit 130, to be used to calculate d shaft voltage command values according to busbar voltage, phase current.Specifically
Ground, referring to Fig. 5, d shaft current reference values determination subelement 132 and d shaft voltage command values determination subelement 134.
D shaft current reference values determination subelement 132, for calculating the reference of d shaft currents according to q shaft currents and busbar voltage
Value.Specifically, d shaft currents reference value determination subelement 132 can be calculated d shaft current reference values by following formula：
Wherein,η is presetting voltage utilization, udcFor busbar voltage, Iq is presetting q axles
Given value of current amount, ωrFor motor speed actual value, ψ is the rotor permanent magnet magnetic linkage of motor, and Ld is d axle inductances.
D shaft voltage command values determination subelement 134, for calculating d shaft voltages according to d shaft currents reference value and d shaft currents
Command value.Specifically, d shaft voltages command value determination subelement 134 can be counted by following formula to d shaft voltage command values
Calculate：
ud=Kp3 *(id_Ref-id)+Ki3 *∫(id_Ref-id)dt
Wherein, udFor d shaft voltage command values, id_RefFor d shaft current reference values, idFor d shaft currents, Kp3For presetting
Three proportionality coefficients, Ki3For presetting third integral coefficient.
Pwm unit 140 is used for according to q shaft voltages command value and d shaft voltages command value generation pulse-width signal,
And according to pulse-width signal control drive circuit motor operating.
Specifically, bridge conducting dutycycle information on three-phase of the pulse-width signal comprising motor, inversion module is according to duty
Than information on or off.It is to be appreciated that can be calculated by following formula duty cycle information：
First, the three-phase output pulse width of motor is calculated according to d shaft voltages command value and q shaft voltages command value.
uα=ud cosθ-uq sinθ
uβ=ud sinθ+uq cosθ
uu=uα
Bridge conducting dutycycle on the three-phase of motor is calculated according to three-phase output pulse width.
To sum up, power conversion control device provided in an embodiment of the present invention, unit and d are given by q shaft voltages command value
Shaft voltage command value gives unit respectively according to the supply voltage of circuit parameter receiving unit reception, busbar voltage, input to electricity
The phase current of machine and presetting motor speed reference value are calculated after q shaft voltages command value and d shaft voltage command values, pulsewidth
Modulating unit is again according to q shaft voltages command value and d shaft voltages command value generation pulse-width signal, so as in alternating voltage peak
Place, controlled motor exports larger power, and near alternating voltage zero-crossing point, controlled motor output smaller power, so that
Obtain input current waveform smaller near alternating voltage zero-crossing point, reduce current harmonics, increase power factor, also cause electricity
The operating efficiency of machine is enhanced.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.It should be noted that：Similar label and letter exists
Similar terms is represented in following accompanying drawing, therefore, once being defined in a certain Xiang Yi accompanying drawing, is then not required in subsequent accompanying drawing
It is further defined and explained.
Claims (10)
1. a kind of power conversion control device, for controlling drive circuit to be operated with drive motor, it is characterised in that the power
Conversion control apparatus includes：
Circuit parameter receiving unit, the supply voltage sent for one circuit parameter Acquisition Circuit of reception, busbar voltage, input are extremely
The phase current of motor；
Q shaft voltages command value gives unit, for according to the supply voltage, the phase current and presetting motor speed ginseng
Examine value and calculate q shaft voltage command values；
D shaft voltages command value gives unit, for calculating d shaft voltage command values according to the busbar voltage, the phase current；
Pwm unit, for according to the q shaft voltages command value and d shaft voltages command value generation pulsewidth modulation letter
Number, and control the drive circuit to drive the motor operating according to the pulse-width signal.
2. power conversion control device as claimed in claim 1, it is characterised in that the q shaft voltages command value gives unit
Including：
Mean power reference value determination subelement, based on according to the presetting motor speed reference value and the phase current
Calculate mean power reference value；
Value and power reference determination subelement, for calculating power reference according to the mean power reference value and the supply voltage
Value；
Q shaft current reference value determination subelements, for calculating the reference of q shaft currents according to the value and power reference and the phase current
Value；
Q shaft voltage command value determination subelements, for calculating the q axles according to the q shaft currents reference value and the phase current
Voltage instruction value.
3. power conversion control device as claimed in claim 2, it is characterised in that the mean power reference value determines that son is single
Member is used to calculate motor speed actual value according to the phase current, and passes through formula Pavr_Ref=Kp1 *(ωr_Ref-ωr)+Ki1 *∫
(ωr_Ref-ωr) the dt calculating mean power reference value, wherein, Pavr_RefFor mean power reference value, ωr_RefTurn for motor
Fast reference value, ωrFor motor speed actual value, Kp1For the first presetting proportionality coefficient, Ki1For presetting first integral system
Number.
4. power conversion control device as claimed in claim 2, it is characterised in that the value and power reference determination subelement is used
In by square being multiplied the mean power reference value and the supply voltage, so as to obtain the value and power reference.
5. power conversion control device as claimed in claim 2, it is characterised in that the q shaft currents reference value determines that son is single
Member is used to pass through formulaThe q shaft currents reference value is calculated, wherein, iq_RefReferred to for q shaft currents
Value, PRefFor value and power reference, Ud is d axle current voltages, and Uq is q axle current voltages, idFor d shaft currents.
6. power conversion control device as claimed in claim 2, it is characterised in that the q shaft voltages command value determines that son is single
Member is used to pass through formula uq=Kp2 *(iq_Ref-iq)+Ki2 *∫(iq_Ref-iq) the dt calculating q shaft voltages command value, wherein, uqFor q
Shaft voltage command value, iq_RefFor q shaft current reference values, iqFor q shaft currents, Kp2For the second presetting proportionality coefficient, Ki2To be pre-
The second integral coefficient of setting.
7. power conversion control device as claimed in claim 1, it is characterised in that the d shaft voltages command value gives unit
Including：
D shaft current reference value determination subelements, for calculating the reference of d shaft currents according to the phase current and the busbar voltage
Value；
D shaft voltage command value determination subelements, for calculating the d axles according to the d shaft currents reference value and the phase current
Voltage instruction value.
8. power conversion control device as claimed in claim 7, it is characterised in that the d shaft currents reference value determines that son is single
Member is used to pass through formulaThe d shaft currents reference value is calculated, wherein,η is presetting voltage utilization, udcFor busbar voltage, Iq is presetting q shaft current specified rates, ωr
For motor speed actual value, ψ is the rotor permanent magnet magnetic linkage of motor, and Ld is d axle inductances.
9. power conversion control device as claimed in claim 8, it is characterised in that pass through formulaThe motor is turned
Fast actual value is calculated, wherein, θ is the angle of rotor permanent magnet flux linkage.
10. power conversion control device as claimed in claim 7, it is characterised in that the d shaft voltages command value determines that son is single
Member is used to pass through formula ud=Kp3 *(id_Ref-id)+Ki3 *∫(id_Ref-id) the dt calculating d shaft voltages command value, wherein, udFor d
Shaft voltage command value, id_RefFor d shaft current reference values, idFor d shaft currents, Kp3For the 3rd presetting proportionality coefficient, Ki3To be pre-
The third integral coefficient of setting.
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| CN201710597303.XA CN107147346B (en) | 2017-07-20 | 2017-07-20 | power conversion control device |
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|---|---|---|---|
| CN201710597303.XA CN107147346B (en) | 2017-07-20 | 2017-07-20 | power conversion control device |
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| CN107147346B CN107147346B (en) | 2018-11-13 |
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| CN107612402A (en) * | 2017-09-27 | 2018-01-19 | 奥克斯空调股份有限公司 | power conversion circuit resonance suppressing method and device |
| CN107743003A (en) * | 2017-11-27 | 2018-02-27 | 奥克斯空调股份有限公司 | Field weakening control method and device |
| CN107834924A (en) * | 2017-11-27 | 2018-03-23 | 奥克斯空调股份有限公司 | A kind of field weakening control method and device |
| CN107947684A (en) * | 2017-11-27 | 2018-04-20 | 奥克斯空调股份有限公司 | A kind of DC bus-bar voltage guard method and device |
| CN108092583A (en) * | 2017-12-26 | 2018-05-29 | 奥克斯空调股份有限公司 | The current control method and device of a kind of permanent magnet synchronous motor |
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| CN107834924A (en) * | 2017-11-27 | 2018-03-23 | 奥克斯空调股份有限公司 | A kind of field weakening control method and device |
| CN107947684A (en) * | 2017-11-27 | 2018-04-20 | 奥克斯空调股份有限公司 | A kind of DC bus-bar voltage guard method and device |
| CN107743003B (en) * | 2017-11-27 | 2018-12-21 | 奥克斯空调股份有限公司 | Field weakening control method and device |
| CN107947684B (en) * | 2017-11-27 | 2019-08-27 | 奥克斯空调股份有限公司 | A kind of DC bus-bar voltage guard method and device |
| CN107834924B (en) * | 2017-11-27 | 2019-08-27 | 奥克斯空调股份有限公司 | A kind of field weakening control method and device |
| CN108092583A (en) * | 2017-12-26 | 2018-05-29 | 奥克斯空调股份有限公司 | The current control method and device of a kind of permanent magnet synchronous motor |
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