CN107147346A - Power conversion control device - Google Patents
Power conversion control device Download PDFInfo
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- 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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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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]
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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
- H02P27/045—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
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 invention relates to the technical field of variable frequency driving, in particular to a power conversion control device.
Background
The compressor is a driven fluid machine for lifting low-pressure gas into high-pressure gas, and the compressor needs to be driven by a motor to work.
In the prior art, the power absorbed by the motor is constant power, the power at the peak value of the alternating voltage is not different from the power near the zero crossing point of the alternating voltage, and the current when the zero crossing point reaches Beijing is larger because the alternating voltage is lower near the zero crossing point, so that the alternating input current is not a sine wave, the power factor is lower, the harmonic current is larger, and the working efficiency of the compressor motor is low.
Disclosure of Invention
The invention aims to provide a power conversion control device, which is used for reducing harmonic current and improving power factor.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
the embodiment of the invention provides a power conversion control device, which is used for controlling a driving circuit to drive a motor to operate, and comprises:
the circuit parameter receiving unit is used for receiving the power supply voltage, the bus voltage and the phase current input to the motor which are sent by the circuit parameter acquisition circuit;
the q-axis voltage instruction value giving unit is used for calculating a q-axis voltage instruction value according to the power supply voltage, the phase current and a preset motor rotating speed reference value;
a d-axis voltage instruction value giving unit for calculating a d-axis voltage instruction value according to the bus voltage and the phase current;
and the pulse width modulation unit is used for generating a pulse width modulation signal according to the q-axis voltage instruction value and the d-axis voltage instruction value and controlling the driving circuit to drive the motor to operate according to the pulse width modulation signal.
Further, the q-axis voltage command value giving unit includes: the average power reference value determining subunit is used for calculating an average power reference value according to the preset motor rotating speed reference value and the phase current;
a power reference value determining subunit, configured to calculate a power reference value according to the average power reference value and the power supply voltage;
a q-axis current reference value determining subunit, configured to calculate a q-axis current reference value according to the power reference value and the phase current;
and the q-axis voltage instruction value determining subunit is used for calculating the q-axis voltage instruction value according to the q-axis current reference value and the phase current.
Further, the average power reference value determining subunit is configured to calculate an actual value of the motor speed according to the phase current, and use the equation Pavr_Ref＝Kp1*(ωr_Ref-ωr)+Ki1*∫(ωr_Ref-ωr) dt calculating the mean power reference value, wherein Pavr_RefIs an average power reference value, ωr_RefAs a reference value of the motor speed, ωrIs the actual value of the motor speed, Kp1For a predetermined first scale factor, Ki1Is a preset first integral coefficient.
Further, the power reference value determining subunit is configured to obtain the power reference value by multiplying the average power reference value by a square of the supply voltage.
Further, the q-axis current reference value determination subunit is used for calculating a pass equationCalculating the q-axis current referenceA value of, wherein iq_RefFor q-axis current reference, PRefFor the power reference value, Ud is the d-axis current voltage, Uq is the q-axis current voltage, idIs the d-axis current.
Further, the q-axis voltage command value determination subunit is configured to determine the q-axis voltage command value by the equation uq＝Kp2*(iq_Ref-iq)+Ki2*∫(iq_Ref-iq) dt calculating the q-axis voltage command value, where uqIs a q-axis voltage command value, iq_RefFor q-axis current reference value, iqIs q-axis current, Kp2For a predetermined second proportionality coefficient, Ki2Is a preset second integral coefficient.
Further, the d-axis voltage command value giving unit includes:
the d-axis current reference value determining subunit is used for calculating a d-axis current reference value according to the phase current and the bus voltage;
and the d-axis voltage instruction value determining subunit is used for calculating the d-axis voltage instruction value according to the d-axis current reference value and the phase current.
Further, the d-axis current reference value determination subunit is used for calculating a pass equationCalculating the d-axis current reference value, wherein,η for a predetermined voltage utilization factor, udcFor the bus voltage, Iq is a predetermined given amount of q-axis current, ωrThe actual value of the motor rotating speed is psi, the rotor permanent magnet flux linkage of the motor is phi, and the Ld is d-axis inductance.
Further, the formulaCalculating the actual value of the rotating speed of the motor, wherein,and theta is the angle of the permanent magnet flux linkage of the motor rotor.
Further, the d-axis voltage command value determination subunit is configured to determine the d-axis voltage command value by the equation ud＝Kp3 *(id_Ref-id)+Ki3 *∫(id_Ref-id) dt calculates the d-axis voltage command value, where udIs a d-axis voltage command value, id_RefIs a d-axis current reference value, idIs d-axis current, Kp3Is a predetermined third proportionality coefficient, Ki3Is a preset third integral coefficient.
In the power conversion control device provided in the embodiment of the present invention, after the q-axis voltage command value giving unit and the d-axis voltage command value giving unit calculate the q-axis voltage command value and the d-axis voltage command value according to the power supply voltage, the bus voltage, the phase current input to the motor, and the preset motor rotation speed reference value received by the circuit parameter receiving unit, respectively, the pulse width modulation unit generates the pulse width modulation signal according to the q-axis voltage command value and the d-axis voltage command value, so as to control the motor to output a larger power at the ac voltage peak value, and control the motor to output a smaller power near the ac voltage zero crossing point, so that the input current waveform is smaller near the ac voltage zero crossing point, the current harmonic is reduced, the power factor is increased, and the working efficiency of the motor is enhanced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a circuit diagram of a power conversion control apparatus to which an embodiment of the present invention is applicable.
Fig. 2 shows a functional block diagram of a power conversion control apparatus according to an embodiment of the present invention.
Fig. 3 is a topology diagram of a power conversion control apparatus according to an embodiment of the present invention.
Fig. 4 is a functional block diagram of a q-axis voltage command value giving unit according to an embodiment of the present invention.
Fig. 5 is a functional block diagram of a d-axis voltage command value setting unit according to an embodiment of the present invention.
Icon: 100-a power conversion control device; 110-a circuit parameter receiving unit; a 120-q axis voltage command value giving unit; 122-average power reference value determination subunit; 124-a power reference value determining subunit; 126-q axis current reference value determination subunit; a 128-q axis voltage command value determination subunit; 130-d-axis voltage command value setting unit; a 132-d-axis current reference value determination subunit; a 134-d axis voltage command value determination subunit; 140-pulse width modulation unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Examples
The embodiment of the invention provides a power conversion control device 100, which is used for controlling a driving circuit to drive a motor to operate, so that the output power of the motor can be controlled according to the change of alternating voltage. Referring to fig. 1, a circuit diagram of an applicable power conversion control apparatus 100 is shown. It is understood that the control module includes the power conversion control apparatus 100 provided in the embodiment of the present invention.
Referring to fig. 2, the power conversion control apparatus 100 includes a circuit parameter receiving unit 110, a q-axis voltage command value specifying unit 120, a d-axis voltage command value specifying unit 130, and a pulse width modulation unit 140. Referring to fig. 3, the power conversion control apparatus 100 is used for controlling the motor by using the topology shown in fig. 3.
The circuit parameter receiving unit 110 is configured to receive a power supply voltage, a bus voltage, and a phase current input to the motor, which are sent by a circuit parameter acquiring circuit.
The q-axis voltage command value setting unit 120 is configured to calculate a q-axis voltage command value according to the power supply voltage, the phase current, and a preset motor rotation speed reference value.
Specifically, referring to fig. 4, the q-axis voltage command value giving unit 120 includes an average power reference value determining subunit 122, a power reference value determining subunit 124, a q-axis current reference value determining subunit 126, and a q-axis voltage command value determining subunit 128.
The average power reference value determining subunit 122 is configured to calculate an average power reference value according to a preset motor speed reference value and a preset phase current. Specifically, the process of the average power reference value determining subunit 122 calculating the average power reference value according to the preset motor speed reference value and the phase current is as follows:
firstly, calculating the actual value of the rotating speed of the motor according to the phase current, wherein the process is as follows:
through u-phase current iuAnd v phase current ivCalculating w phase current iw：
iw＝-iu-iv
And passes u-phase current iuV phase current ivAnd w phase current iwα axis current and β axis current are calculated, and the formula is as follows:
iα＝iu
the q-axis current is calculated as:
iq＝iβcosθ-iαsinθ
the formula for calculating the d-axis current is as follows:
id＝iαcosθ+iβsinθ
the theta is the angle of the permanent magnet flux linkage of the motor rotor and can be obtained through a traditional position estimation algorithm, and the calculation process is as follows:
first, the d-axis component and the q-axis component of the back electromotive force are calculated according to the following formulas:
wherein the error of the estimated angle from the actual angle
The angle of the permanent magnet flux linkage of the motor rotor is calculated by the following equation:
θ(n)＝θ(n-1)+Δθ
then, the actual value of the motor speed ωrComprises the following steps:
secondly, calculating an average power reference value P according to a preset motor rotating speed reference value and a motor rotating speed actual valueavr_RefThe calculation formula is as follows:
Pavr_Ref＝Kp1 *(ωr_Ref-ωr)+Ki1 *∫(ωr_Ref-ωr)dt
wherein, Pavr_RefIs an average power reference value, ωr_RefAs a reference value of the motor speed, ωrIs the actual value of the motor speed, Kp1For a predetermined first scale factor, Ki1Is a preset first integral coefficient.
The power reference value determining subunit 124 is configured to calculate a power reference value according to the average power reference value and the power supply voltage. Specifically, the power reference value determining subunit 124 may calculate the power reference value by the following equation:
PRef＝Pavr_Ref*uac*uac
wherein u isacIs the supply voltage.
The q-axis current reference value determination subunit 126 is configured to calculate a q-axis current reference value according to the power reference value and the phase current. Specifically, the q-axis current reference value determination subunit 126 may calculate the q-axis current reference value by the following equation:
wherein iq_RefFor q-axis current reference, PRefFor the power reference value, Ud is the d-axis current voltage, Uq is the q-axis current voltage, idIs the d-axis current.
The q-axis voltage command value determination subunit 128 is configured to calculate a q-axis voltage command value according to the q-axis current reference value and the phase current. Specifically, the q-axis voltage command value determination subunit 128 may calculate the q-axis voltage command value by the following equation:
uq＝Kp2 *(iq_Ref-iq)+Ki2 *∫(iq_Ref-iq)dt
wherein u isqIs a q-axis voltage command value, iq_RefFor q-axis current reference value, iqIs q-axis current, Kp2For a predetermined second proportionality coefficient, Ki2Is a preset second integral coefficient.
The d-axis voltage command value setting unit 130 is configured to calculate a d-axis voltage command value according to the bus voltage and the phase current. Specifically, referring to fig. 5, a d-axis current reference value determining subunit 132 and a d-axis voltage command value determining subunit 134 are provided.
The d-axis current reference value determining subunit 132 is configured to calculate a d-axis current reference value according to the q-axis current and the bus voltage. Specifically, the d-axis current reference value determining subunit 132 may calculate the d-axis current reference value by the following equation:
wherein,η for a predetermined voltage utilization factor, udcFor the bus voltage, Iq is a predetermined given amount of q-axis current, ωrThe actual value of the motor rotating speed is psi, the rotor permanent magnet flux linkage of the motor is phi, and the Ld is d-axis inductance.
The d-axis voltage command value determining subunit 134 is configured to calculate a d-axis voltage command value according to the d-axis current reference value and the d-axis current. Specifically, the d-axis voltage command value determination subunit 134 may calculate the d-axis voltage command value by the following equation:
ud＝Kp3 *(id_Ref-id)+Ki3 *∫(id_Ref-id)dt
wherein u isdIs a d-axis voltage command value, id_RefIs a d-axis current reference value, idIs d-axis current, Kp3Is a predetermined third proportionality coefficient, Ki3Is a preset third integral coefficient.
The pulse width modulation unit 140 is configured to generate a pulse width modulation signal according to the q-axis voltage command value and the d-axis voltage command value, and control the driving circuit to drive the motor to operate according to the pulse width modulation signal.
Specifically, the pulse width modulation signal contains three-phase upper bridge conduction duty ratio information of the motor, and the inversion module is conducted or disconnected according to the duty ratio information. It will be appreciated that the duty cycle information may be calculated by the following equation:
firstly, the three-phase output pulse width of the motor is calculated according to the d-axis voltage command value and the q-axis voltage command value.
uα＝udcosθ-uqsinθ
uβ＝udsinθ+uqcosθ
uu＝uα
And calculating the three-phase upper bridge conduction duty ratio of the motor according to the three-phase output pulse width.
To sum up, in the power conversion control apparatus provided in the embodiment of the present invention, after the q-axis voltage command value setting unit and the d-axis voltage command value setting unit calculate the q-axis voltage command value and the d-axis voltage command value according to the power voltage, the bus voltage, the phase current input to the motor, and the preset motor rotation speed reference value received by the circuit parameter receiving unit, respectively, the pulse width modulation unit generates the pulse width modulation signal according to the q-axis voltage command value and the d-axis voltage command value, so as to control the motor to output a larger power at the ac voltage peak value, and control the motor to output a smaller power near the ac voltage zero crossing point, so that the input current waveform is smaller near the ac voltage zero crossing point, the current harmonic is reduced, the power factor is increased, and the working efficiency of the motor is enhanced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (10)
1. A power conversion control apparatus for controlling a drive circuit to operate a motor, the power conversion control apparatus comprising:
the circuit parameter receiving unit is used for receiving the power supply voltage, the bus voltage and the phase current input to the motor which are sent by the circuit parameter acquisition circuit;
the q-axis voltage instruction value giving unit is used for calculating a q-axis voltage instruction value according to the power supply voltage, the phase current and a preset motor rotating speed reference value;
a d-axis voltage instruction value giving unit for calculating a d-axis voltage instruction value according to the bus voltage and the phase current;
and the pulse width modulation unit is used for generating a pulse width modulation signal according to the q-axis voltage instruction value and the d-axis voltage instruction value and controlling the driving circuit to drive the motor to operate according to the pulse width modulation signal.
2. The power conversion control device according to claim 1, wherein the q-axis voltage command value giving unit includes:
the average power reference value determining subunit is used for calculating an average power reference value according to the preset motor rotating speed reference value and the phase current;
a power reference value determining subunit, configured to calculate a power reference value according to the average power reference value and the power supply voltage;
a q-axis current reference value determining subunit, configured to calculate a q-axis current reference value according to the power reference value and the phase current;
and the q-axis voltage instruction value determining subunit is used for calculating the q-axis voltage instruction value according to the q-axis current reference value and the phase current.
3. The power conversion control apparatus according to claim 2, wherein the average power reference value determining subunit is configured to calculate an actual value of the motor speed according to the phase current, and to use the equation Pavr_Ref＝Kp1 *(ωr_Ref-ωr)+Ki1 *∫(ωr_Ref-ωr) dt calculating the mean power reference value, wherein Pavr_RefIs an average power reference value, ωr_RefAs a reference value of the motor speed, ωrIs the actual value of the motor speed, Kp1For a predetermined first scale factor, Ki1Is a preset first integral coefficient.
4. The power conversion control apparatus according to claim 2, wherein the power reference value determining subunit is configured to obtain the power reference value by multiplying the average power reference value by a square of the power supply voltage.
5. The power conversion control apparatus according to claim 2, wherein the q-axis current reference value determining subunit is configured to determine the q-axis current reference value by an equationCalculating the q-axis current reference value, wherein iq_RefFor q-axis current reference, PRefFor the power reference value, Ud is the d-axis current voltage, Uq is the q-axis current voltage, idIs the d-axis current.
6. The power conversion control apparatus according to claim 2, wherein the q-axis voltage command value determining subunit is configured to determine the q-axis voltage command value by the equation uq＝Kp2 *(iq_Ref-iq)+Ki2 *∫(iq_Ref-iq) dt calculating the q-axis voltage command value, where uqIs a q-axis voltage command value, iq_RefFor q-axis current reference value, iqIs q-axis current, Kp2For a predetermined second proportionality coefficient, Ki2Is a preset second integral coefficient.
7. The power conversion control device according to claim 1, wherein the d-axis voltage command value giving unit includes:
the d-axis current reference value determining subunit is used for calculating a d-axis current reference value according to the phase current and the bus voltage;
and the d-axis voltage instruction value determining subunit is used for calculating the d-axis voltage instruction value according to the d-axis current reference value and the phase current.
8. The power conversion control apparatus of claim 7, whereinThe d-axis current reference value determining subunit is used for calculating a pass equationCalculating the d-axis current reference value, wherein,η for a predetermined voltage utilization factor, udcFor the bus voltage, Iq is a predetermined given amount of q-axis current, ωrThe actual value of the motor rotating speed is psi, the rotor permanent magnet flux linkage of the motor is phi, and the Ld is d-axis inductance.
9. The power conversion control apparatus according to claim 8, wherein the pass equation isAnd calculating the actual value of the motor rotating speed, wherein theta is the angle of the permanent magnet flux linkage of the motor rotor.
10. The power conversion control device according to claim 7, wherein the d-axis voltage command value determining subunit is configured to determine the d-axis voltage command value by the equation ud＝Kp3 *(id_Ref-id)+Ki3 *∫(id_Ref-id) dt calculates the d-axis voltage command value, where udIs a d-axis voltage command value, id_RefIs a d-axis current reference value, idIs d-axis current, Kp3Is a predetermined third proportionality coefficient, Ki3Is a preset third integral coefficient.
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| 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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| 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 |
| 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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| CN107147346B (en) | 2018-11-13 |
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