CN106788074A - A kind of compressor control method and device - Google Patents
A kind of compressor control method and device Download PDFInfo
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- CN106788074A CN106788074A CN201611080482.1A CN201611080482A CN106788074A CN 106788074 A CN106788074 A CN 106788074A CN 201611080482 A CN201611080482 A CN 201611080482A CN 106788074 A CN106788074 A CN 106788074A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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Abstract
The present invention provides a kind of compressor control method and device, is used to solve the problems, such as that current compressor control arithmetic accuracy is relatively low, wherein, the method includes：The the first optimum torque angle for making the compressor power input minimum when determining that compressor is run with the first predeterminated frequency；The the second optimum torque angle for making the compressor power input minimum when determining that compressor is run with the second predeterminated frequency；The corresponding 3rd optimum torque angle of compressor actual motion frequency is determined according to compressor actual motion frequency and the magnitude relationship of first predeterminated frequency and/or the second predeterminated frequency；Vector Rotation control is carried out to the compressor using the 3rd optimum torque angle, the program maximizes the precision that improve direct-axis current advance angle in MTPA algorithms, and then realizes the high-precision control of MTPA.
Description
Technical field
The present invention relates to compressor control field, more particularly to a kind of compressor control method and device.
Background technology
The output torque formula of compressor salient-pole machine is：
Te=1.5P (Ψ m*Iq+ (Ld-Lq) * Id*Iq) (1)
Wherein：P be motor pole number, Ψ m be the magnetic linkage of permanent magnet, Id, Iq be direct-axis current and quadrature axis current and Ld, Lq
It is d-axis inductance and quadrature axis inductance.By formula (1) as can be seen that motor torque is made up of two parts, 1.5P* Ψ m*Iq are excitations
Torque, 1.5P* (Ld-Lq) * Id*Iq are reluctance torques.When the Id of negative sense is injected, can increase output torque, such as Fig. 1 institutes
Show.
With the phase angle β of the amplitude Im and the advanced Id of the electric current of stator current come representation formula (1), Id=Im*cos β
(2), Iq=Im*sin β (3), obtain formula as follows：
Te=1.5P (Ψ m*Im*sin β+(Ld-Lq) * Im*cos β * Im*sin β)=1.5P (Ψ m*Im*sin β+(Ld-
Lq)*Im2*sin2β/2) (4)
Above-mentioned formula (4) is carried out into differential, is obtained
Te ˊ=1.5P (Ψ m*Im*cos β+(Ld-Lq) * Im2*cos2β) (5)
When Te ˊ=0, Te has maximum in 0-180 intervals, can obtain：
Ψ m*cos β+(Ld-Lq) * Im*cos2 β=0 (6)
Above-mentioned equation is solved, can be obtained：
β in formula (7), as optimum torque angle.
Formula (7) is substituted into formula (2), is hadBy Im=Iq/
Sin β (9) substitute into (8), have
By formula (10), directly calculate Id values, so as to realize MTPA (maximum torque per ampere,
MTPA, torque capacity electric current ratio) algorithm control.It is clear that the intrinsic parameter of Ψ m, Ld, Lq for compression motor, Iq is calculation
Controlled quentity controlled variable in method.This kind of implementation due to depending on the parameter of compressor, in actual air-conditioning system, different current conditions
Lower Ld and Lq is change, therefore, this method control accuracy is relatively low；In the driving algorithm of compression, compressor drum
Position estimation is that the PLL (Phase Locked Loop are phase-locked loop or phase-lock-loop algorithm) based on counter electromotive force is realized.
In the algorithm, due to the use of high-pass filter so that Id references angles can have certain error with actual rotor angle,
Especially within the compressor low-frequency operation when, Id angle estimation errors are relatively large, what this was allowed for based on rotor position estimation
All there is certain error in variable, this also causes the reduction of MTPA arithmetic accuracies, influences the efficiency of whole machine.
The content of the invention
The present invention provides a kind of compressor control method and device, is used to solve current compressor control arithmetic accuracy relatively low
Problem.
According to the first aspect of the invention, there is provided a kind of compressor control method, including：Determine compressor with first
Predeterminated frequency makes the first minimum optimum torque angle of compressor power input when running；Determine that compressor is transported with the second predeterminated frequency
The the second optimum torque angle for making compressor power input minimum during row；According to compressor actual motion frequency and the first predeterminated frequency
And/or second the magnitude relationship of predeterminated frequency determine the corresponding 3rd optimum torque angle of compressor actual motion frequency；Use
Three optimum torque angles carry out Vector Rotation control to compressor.
Wherein, the first predeterminated frequency belongs to the low-frequency range of compressor operating, and the second predeterminated frequency belongs to compressor operating
High band.
Wherein, according to compressor actual motion frequency and the magnitude relationship of the first predeterminated frequency and/or the second predeterminated frequency
Determine the corresponding 3rd optimum torque angle of compressor actual motion frequency, including：According to optimal turn of the first predeterminated frequency and first
The corresponding relation at square angle, and/or, the corresponding relation at the second predeterminated frequency and the second optimum torque angle, the control of generation optimum torque angle
Koji-making line；Actual motion frequency values according to compressor obtain corresponding optimal with the actual motion frequency values based on controlling curve
The angle value of angle of torsion.
Wherein, controlling curve includes：Low-frequency range, Mid Frequency and high band；The angle value of the corresponding angle of torsion of low-frequency range
It is the angle value at the first optimum torque angle, the angle value that the angle value of the corresponding angle of torsion of high band is the second optimum torque angle,
The angle value of the corresponding angle of torsion of Mid Frequency is related to frequency linearity.
Wherein, according to compressor actual motion frequency and the magnitude relationship of the first predeterminated frequency and/or the second predeterminated frequency
Determine the corresponding 3rd optimum torque angle of compressor actual motion frequency, including：If the actual motion frequency of compressor is less than
First predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle is equal to the angle value at the first optimum torque angle；If compression
The actual motion frequency of machine is more than the second predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle is equal to the second optimum torque
The angle value at angle；If the actual motion frequency of compressor is more than the first predeterminated frequency and less than the second predeterminated frequency, basis
First predeterminated frequency, the second predeterminated frequency, the first optimum torque angle and the second optimum torque angle calculate according to equation below
To the 3rd optimum torque angle：β=k*Fre+b, wherein, k=(β2-β1)/(F2-F1), b=(β1*F2-β2*F1)/(F2-F1), β is
3rd optimum torque angle, Fre is compressor actual motion frequency, β1It is the first optimum torque angle, β2It is the second optimum torque angle,
F1It is the first predeterminated frequency and F2It is the second predeterminated frequency.
According to the second aspect of the invention, there is provided a kind of compressor control device, including：First determining module, uses
In it is determined that compressor makes the first minimum optimum torque angle of compressor power input when being run with the first predeterminated frequency；Second determines
Module, for determining to make the second minimum optimum torque angle of compressor power input when compressor is run with the second predeterminated frequency；
3rd determining module, for the size according to compressor actual motion frequency and the first predeterminated frequency and/or the second predeterminated frequency
Relation determines the corresponding 3rd optimum torque angle of compressor actual motion frequency；Control module, for using the 3rd optimum torque
Angle carries out Vector Rotation control to compressor.
Wherein, the first predeterminated frequency belongs to the low-frequency range of compressor operating, and the second predeterminated frequency belongs to compressor operating
High band.
Wherein, above-mentioned 3rd determining module, including：Generation unit, for according to optimal turn of the first predeterminated frequency and first
The corresponding relation at square angle, and/or, the corresponding relation at the second predeterminated frequency and the second optimum torque angle, the control of generation optimum torque angle
Koji-making line；First determining unit, is obtained and the actual fortune for the actual motion frequency values according to compressor based on controlling curve
The angle value at the corresponding optimum torque angle of line frequency value.
Wherein, controlling curve includes：Low-frequency range, Mid Frequency and high band；The angle value of the corresponding angle of torsion of low-frequency range
It is the angle value at the first optimum torque angle, the angle value that the angle value of the corresponding angle of torsion of high band is the second optimum torque angle,
The angle value of the corresponding angle of torsion of Mid Frequency is related to frequency linearity.
Wherein, the 3rd determining module, including：Second determining unit, if be less than for the actual motion frequency of compressor
First predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle is equal to the angle value at the first optimum torque angle；3rd determines
Unit, if being more than the second predeterminated frequency for the actual motion frequency of compressor, it is determined that the angle at the 3rd optimum torque angle
Angle value of the value equal to the second optimum torque angle；Computing unit, if pre- more than first for the actual motion frequency of compressor
If frequency and less than the second predeterminated frequency, then according to the first predeterminated frequency, the second predeterminated frequency, the first optimum torque angle and
Two optimum torque angles are calculated the 3rd optimum torque angle according to equation below：β=k*Fre+b, wherein, k=(β2-β1)/(F2-
F1), b=(β1*F2-β2*F1)/(F2-F1), β is the 3rd optimum torque angle, and Fre is compressor actual motion frequency, β1It is first
Optimum torque angle, β2It is the second optimum torque angle, F1It is the first predeterminated frequency and F2It is the second predeterminated frequency.The present invention is implemented
The scheme that example is provided determines optimum torque angle according to the frequency of compressor actual motion, and maximization improves d-axis in MTPA algorithms
The precision of electric current advance angle, and then realize the high-precision control of MTPA.
Brief description of the drawings
Fig. 1 is that the amplitude of compressor stator electric current in correlation technique is illustrated with the relation of direct-axis current and quadrature axis current
Figure；
Fig. 2 is the flow chart of the compressor control method of offer in first embodiment of the invention；
Fig. 3 is the schematic diagram of the controlling curve at the optimum torque angle of offer in first embodiment of the invention；
Fig. 4 is compressor Vector Rotation control algolithm schematic diagram in first embodiment of the invention；
Fig. 5 is the application flow schematic diagram of the compressor control method that third embodiment of the invention is provided；
Fig. 6 is the structured flowchart of the compressor control device that fourth embodiment of the invention is provided.
Specific embodiment
In order to solve the problems, such as that current compressor control arithmetic accuracy is relatively low in the prior art, the invention provides one kind pressure
Contracting machine control method and device, below in conjunction with accompanying drawing and embodiment, the present invention will be described in further detail.Should manage
Solution, the specific embodiments described herein are merely illustrative of the present invention, does not limit the present invention.
First embodiment
A kind of compressor control method is present embodiments provided, Fig. 2 is the flow chart of the method, as shown in Fig. 2 the method
Including following treatment：
Step 201：Make compressor power input minimum when determining that compressor is run with the first predeterminated frequency first is optimal
Angle of torsion；
Low frequency point Id (direct-axis current) advance angles β1The assay method at (i.e. above-mentioned first optimum torque angle) can specifically be wrapped
Include：A Frequency point F is chosen in the low-frequency range of compressor operating1, such as 30Hz, in Frequency point adjustment advance angle β1Value, look for
Corresponding angle value when going out the input power minimum under identical test operating mode, and the angle value is defined as optimal turn of low frequency point
Square angle beta1, i.e. the first optimum torque angle.
First predeterminated frequency belongs to the low-frequency range of compressor operating, and the frequency values can be an empirical value, in this reality
Apply in example, the low-frequency range of compressor operating can be specifically 10 hertz to 40 hertz.
Step 202：Make compressor power input minimum when determining that compressor is run with the second predeterminated frequency second is optimal
Angle of torsion；
High-frequency I d advance angles β2Assay method can specifically include：A frequency is chosen in the high band of compressor operating
Point F2, such as 80Hz, the Frequency point adjustment repay angle beta2Value, find out under identical test operating mode input power it is minimum when correspondence
Angle value, and the angle value is defined as the optimum torque angle beta of high frequency points2, i.e. the second optimum torque angle.
Wherein, second predeterminated frequency belongs to the high band of compressor operating, can be an empirical value, compressor operating
High band can be specifically 70 hertz to 120 hertz.
Step 203：Size according to compressor actual motion frequency and the first predeterminated frequency and/or the second predeterminated frequency is closed
System determines the corresponding 3rd optimum torque angle of compressor actual motion frequency；
Wherein, according to compressor actual motion frequency and the magnitude relationship of the first predeterminated frequency and/or the second predeterminated frequency
Determine the corresponding 3rd optimum torque angle of compressor actual motion frequency, can specifically include：
According to the first predeterminated frequency and the corresponding relation at the first optimum torque angle, and/or the second predeterminated frequency and second is most
The corresponding relation of excellent angle of torsion, generation optimum torque angle controlling curve；
Actual motion frequency values according to compressor obtain corresponding most with the actual motion frequency values based on controlling curve
The angle value of excellent angle of torsion.
As shown in figure 3, the controlling curve can specifically include：(compressor Mid Frequency can be specifically for low-frequency range, Mid Frequency
40 hertz to 70 hertz) and high band, wherein, 0~F1It is low-frequency range, F1~F2It is Mid Frequency, F2It is afterwards high band, it is low
Frequency range (is less than F1Frequency) angle value of corresponding angle of torsion is the angle value β at the first optimum torque angle1, high band (be more than F2
Frequency) angle value of corresponding angle of torsion is the angle value β at the second optimum torque angle2, Mid Frequency is (more than F1And the F being less than2
Frequency) corresponding angle of torsion angle value it is related to frequency linearity.
Step 204：Vector Rotation control is carried out to compressor using the 3rd optimum torque angle.
As shown in figure 4, the 3rd optimum torque angle is applied in the Vector Rotation control process of compressor as input quantity,
Output direct-axis current refers to (Iq Ref) to d-axis decoupler (Id Decoupler) and quadrature axis current, to complete the calculation of MTPA
Method is controlled.
It should be noted that the compressor in the present embodiment can be the compressor being applied in air-conditioning, further
Can be applied to salient pole than permanent-magnet synchronous compressor the excellent algorithm MTPA of drive efficiency, i.e. compressor in the present embodiment
Can be with salient pole than compressor.
The frequency that the control method that the present embodiment is provided is based on compressor actual motion draws optimum torque angle, maximized
The precision of Id advance angles in MTPA algorithms is improve, the high-precision control of MTPA is realized, the efficiency of compressor is improve, reached
Energy-efficient effect, meanwhile, the method test point is few, realizes that simply, the debug time of compressor can be significantly shorter.
Second embodiment
A kind of compressor control method is present embodiments provided, the method that the method is provided with above-mentioned first embodiment is substantially
Identical, its difference is, the present embodiment realize in the following way according to compressor actual motion frequency and first frequency and/or
The magnitude relationship of second frequency determines the operation at the corresponding 3rd optimum torque angle of compressor actual motion frequency：
If the actual motion frequency of compressor is less than the first predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle
Equal to the angle value at the first optimum torque angle；
If the actual motion frequency of compressor is more than the second predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle
Equal to the angle value at the second optimum torque angle；
If the actual motion frequency of compressor is more than the first predeterminated frequency and less than the second predeterminated frequency, according to first
Predeterminated frequency, the second predeterminated frequency, the first optimum torque angle and the second optimum torque angle are calculated according to equation below
Three optimum torque angles：
β=k*Fre+b, wherein, k=(β2-β1)/(F2-F1), b=(β1*F2-β2*F1)/(F2-F1), β is the 3rd optimal
Angle of torsion, Fre is compressor actual motion frequency, β1It is the first optimum torque angle, β2It is the second optimum torque angle, F1It is first
Predeterminated frequency and F2It is the second predeterminated frequency.
3rd embodiment
The present embodiment is mainly illustrated to the application flow of compressor control method, and Fig. 5 is the pressure that the present embodiment is provided
The flow chart of contracting machine control method, as shown in figure 5, the flow includes following treatment：
Step 501：Determine the corresponding first optimum torque angle of low-frequency range；
Step 502：Determine the corresponding second optimum torque angle of high band；
Step 503：Draft optimum torque angle controlling curve, β=k*Fre+b；
Step 504：The optimum torque angle of compressor actual motion is obtained according to optimum torque angle controlling curve, by the torque
Angle is applied and Vector Rotation, generates follow-up electric current loop reference.
Fourth embodiment
A kind of compressor control device is present embodiments provided, Fig. 6 is the structured flowchart of the device, as shown in fig. 6, the dress
Putting 60 includes following part：
First determining module 61, for determining to make compressor power input minimum when compressor is run with the first predeterminated frequency
The first optimum torque angle；
Second determining module 62, for determining to make compressor power input minimum when compressor is run with the second predeterminated frequency
The second optimum torque angle；
3rd determining module 63, for being preset according to compressor actual motion frequency and the first predeterminated frequency and/or second
The magnitude relationship of frequency determines the corresponding 3rd optimum torque angle of compressor actual motion frequency；
Control module 64, for carrying out Vector Rotation control to compressor using the 3rd optimum torque angle.
Wherein, the first predeterminated frequency belongs to the low-frequency range of compressor operating, and the second predeterminated frequency belongs to compressor operating
High band.
Wherein, above-mentioned 3rd determining module 63, can specifically include：Generation unit, for according to the first predeterminated frequency with
The corresponding relation at the first optimum torque angle, and/or the second predeterminated frequency and the second optimum torque angle corresponding relation, generate it is optimal
Torque angle control curve；First determining unit, for the actual motion frequency values according to compressor based on controlling curve obtain with
The angle value at the corresponding optimum torque angle of the actual motion frequency values.
Wherein, controlling curve includes：Low-frequency range, Mid Frequency and high band；The angle value of the corresponding angle of torsion of low-frequency range
It is the angle value at the first optimum torque angle, the angle value that the angle value of the corresponding angle of torsion of high band is the second optimum torque angle,
The angle value of the corresponding angle of torsion of Mid Frequency is related to frequency linearity.
Wherein, above-mentioned 3rd determining module 63, can specifically include：Second determining unit, if for the reality of compressor
Border running frequency is less than the first predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle is equal to the angle at the first optimum torque angle
Angle value；3rd determining unit, if being more than the second predeterminated frequency for the actual motion frequency of compressor, it is determined that the 3rd is optimal
The angle value of angle of torsion is equal to the angle value at the second optimum torque angle；Computing unit, if for compressor actual motion frequently
Rate more than the first predeterminated frequency and less than the second predeterminated frequency, then according to the first predeterminated frequency, the second predeterminated frequency, first optimal
Angle of torsion and the second optimum torque angle are calculated the 3rd optimum torque angle according to equation below：β=k*Fre+b, wherein, k
=(β2-β1)/(F2-F1), b=(β1*F2-β2*F1)/(F2-F1), β is the 3rd optimum torque angle, and Fre is compressor actual motion
Frequency, β1It is the first optimum torque angle, β2It is the second optimum torque angle, F1It is the first predeterminated frequency and F2It is the second default frequency
Rate.
Although being example purpose, the preferred embodiments of the present invention are had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, therefore, the scope of the present invention should be not limited to above-described embodiment.
Claims (10)
1. a kind of compressor control method, it is characterised in that including：
The the first optimum torque angle for making the compressor power input minimum when determining that compressor is run with the first predeterminated frequency；
The the second optimum torque angle for making the compressor power input minimum when determining that compressor is run with the second predeterminated frequency；
Pressure is determined with the magnitude relationship of first predeterminated frequency and/or the second predeterminated frequency according to compressor actual motion frequency
The corresponding 3rd optimum torque angle of contracting machine actual motion frequency；
Vector Rotation control is carried out to the compressor using the 3rd optimum torque angle.
2. method according to claim 1, it is characterised in that first predeterminated frequency belongs to the low frequency of compressor operating
Section, second predeterminated frequency belongs to the high band of compressor operating.
3. method according to claim 2, it is characterised in that described according to compressor actual motion frequency and described first
The magnitude relationship of predeterminated frequency and/or the second predeterminated frequency determines corresponding 3rd optimum torque of compressor actual motion frequency
Angle, including：
According to the corresponding relation at first predeterminated frequency and the first optimum torque angle, and/or, second predeterminated frequency
With the corresponding relation at the second optimum torque angle, generation optimum torque angle controlling curve；
Actual motion frequency values according to the compressor obtain corresponding with the actual motion frequency values based on the controlling curve
Optimum torque angle angle value.
4. method according to claim 3, it is characterised in that the controlling curve includes：Low-frequency range, Mid Frequency and height
Frequency range；
The angle value of the corresponding angle of torsion of the low-frequency range is corresponding turn of the angle value at the first optimum torque angle, the high band
The angle value at square angle is the angle value at the second optimum torque angle, the angle value and frequency linearity of the corresponding angle of torsion of the Mid Frequency
It is related.
5. method according to claim 2, it is characterised in that described according to compressor actual motion frequency and described first
The magnitude relationship of predeterminated frequency and/or the second predeterminated frequency determines corresponding 3rd optimum torque of compressor actual motion frequency
Angle, including：
If the actual motion frequency of compressor is less than the first predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle
Equal to the angle value at the first optimum torque angle；
If the actual motion frequency of compressor is more than the second predeterminated frequency, it is determined that the angle value at the 3rd optimum torque angle
Equal to the angle value at the second optimum torque angle；
If the actual motion frequency of compressor is more than first predeterminated frequency and less than the second predeterminated frequency, according to described
First predeterminated frequency, the second predeterminated frequency, the first optimum torque angle and the second optimum torque angle calculate according to equation below
To the 3rd optimum torque angle：
β=k*Fre+b, wherein, k=(β2-β1)/(F2-F1), b=(β1*F2-β2*F1)/(F2-F1), β is the 3rd optimum torque
Angle, Fre is compressor actual motion frequency, β1It is the first optimum torque angle, β2It is the second optimum torque angle, F1For first default
Frequency and F2It is the second predeterminated frequency.
6. a kind of compressor control device, it is characterised in that including：
First determining module, for determining to make the compressor power input minimum when compressor is run with the first predeterminated frequency
First optimum torque angle；
Second determining module, for determining to make the compressor power input minimum when compressor is run with the second predeterminated frequency
Second optimum torque angle；
3rd determining module, for according to compressor actual motion frequency and first predeterminated frequency and/or the second default frequency
The magnitude relationship of rate determines the corresponding 3rd optimum torque angle of compressor actual motion frequency；
Control module, for carrying out Vector Rotation control to the compressor using the 3rd optimum torque angle.
7. device according to claim 6, it is characterised in that first predeterminated frequency belongs to the low frequency of compressor operating
Section, second predeterminated frequency belongs to the high band of compressor operating.
8. device according to claim 7, it is characterised in that the 3rd determining module, including：
Generation unit, for the corresponding relation according to first predeterminated frequency and the first optimum torque angle, and/or, institute
State the corresponding relation of the second predeterminated frequency and the second optimum torque angle, generation optimum torque angle controlling curve；
First determining unit, for being obtained and the reality based on the controlling curve according to the actual motion frequency values of the compressor
Border running frequency is worth the angle value at corresponding optimum torque angle.
9. device according to claim 8, it is characterised in that the controlling curve includes：Low-frequency range, Mid Frequency and height
Frequency range；
The angle value of the corresponding angle of torsion of the low-frequency range is corresponding turn of the angle value at the first optimum torque angle, the high band
The angle value at square angle is the angle value at the second optimum torque angle, the angle value and frequency linearity of the corresponding angle of torsion of the Mid Frequency
It is related.
10. device according to claim 7, it is characterised in that the 3rd determining module, including：
Second determining unit, if being less than the first predeterminated frequency for the actual motion frequency of compressor, it is determined that the described 3rd
The angle value at optimum torque angle is equal to the angle value at the first optimum torque angle；
3rd determining unit, if being more than the second predeterminated frequency for the actual motion frequency of compressor, it is determined that the described 3rd
The angle value at optimum torque angle is equal to the angle value at the second optimum torque angle；
Computing unit, if presetting frequency more than first predeterminated frequency and less than second for the actual motion frequency of compressor
Rate, then according to first predeterminated frequency, the second predeterminated frequency, the first optimum torque angle and the second optimum torque angle according to such as
Lower formula is calculated the 3rd optimum torque angle：
β=k*Fre+b, wherein, k=(β2-β1)/(F2-F1), b=(β1*F2-β2*F1)/(F2-F1), β is the 3rd optimum torque
Angle, Fre is compressor actual motion frequency, β1It is the first optimum torque angle, β2It is the second optimum torque angle, F1For first default
Frequency and F2It is the second predeterminated frequency.
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| US20140333242A1 (en) * | 2010-01-28 | 2014-11-13 | Marvell World Trade Ltd. | Systems and methods for adaptive motor speed control |
| CN103133320A (en) * | 2013-02-25 | 2013-06-05 | 长春工业大学 | Torque angle control based air compressor variable speed regulating method |
| CN105262394B (en) * | 2015-09-30 | 2018-01-16 | 南京埃斯顿自动控制技术有限公司 | The MTPA control methods and its control system of a kind of internal permanent magnet synchronous motor |
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