CN106026524B - Variable-frequency motor heat dissipating method, air conditioner - Google Patents
Variable-frequency motor heat dissipating method, air conditioner Download PDFInfo
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- CN106026524B CN106026524B CN201610345484.2A CN201610345484A CN106026524B CN 106026524 B CN106026524 B CN 106026524B CN 201610345484 A CN201610345484 A CN 201610345484A CN 106026524 B CN106026524 B CN 106026524B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- 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
Abstract
The present invention provides a kind of variable-frequency motor heat dissipating method, air conditioner, this method includes that the electric efficiency of motor is determined according to the frequency of motor；The fan efficiency of fan is determined according to the frequency of fan；According to electric efficiency and fan efficiency, frequency of use of the frequency of motor of the fan efficiency not less than electric efficiency when as motor is found out.Since the efficiency of fan efficiency is not less than the efficiency of motor, so that the decaying of the winding heat dissipation capacity of motor is lower than the decaying of heating in winding amount, to ensure that motor winding temperature rise meets the requirement of actual use.The frequency of use of motor when determining that motor and fan work at the same time by electric efficiency and fan efficiency, effectively improves the heat dissipation effect of motor.
Description
Technical field
The present invention relates to air conditioner technical fields, in particular to a kind of variable-frequency motor heat dissipating method, air conditioner.
Background technique
The radiator fan and rotor of standard three-phase alternating current variable-frequency motor be not coaxial, and power supply need to be provided separately.To guarantee
The revolving speed of heat dissipation effect, radiator fan is kept constant, and is not reduced with the reduction of frequency conversion motor body rotor speed, is led to frequency conversion
Motor need to provide two sets of different power supplys and could work normally.Wherein, the structure of threephase asynchronous with it is single-phase asynchronous electronic
Machine is similar, is embedded in three-phase windings (having three kinds of single layer chain type, single layer concentric type and single layer staggered form structures) in stator coring groove.
After stator winding is at access three-phase alternating-current supply, the rotating excitation field that winding current generates generates induced current in rotor conductor,
Rotor generates electromagnetism switch cabinet (i.e. asynchronous switch cabinet) under the interaction of induced current and air-gap rotating magnetic field, makes motor
Rotation.
Summary of the invention
The main purpose of the present invention is to provide a kind of variable-frequency motor heat dissipating methods, air conditioner, to solve in the prior art
Variable-frequency motor heat dissipation effect is not able to satisfy the problem of actual demand.
Further, to achieve the goals above, according to an aspect of the invention, there is provided a kind of variable-frequency motor radiates
Method, comprising: the electric efficiency of motor is determined according to the frequency of motor；The fan efficiency of fan is determined according to the frequency of fan；
According to electric efficiency and fan efficiency, use of the frequency of motor of the fan efficiency not less than electric efficiency when as motor is found out
Frequency.
Further, electric efficiency is η 1, and electric efficiency is obtained by following formula:
1=T × 60 η × f1 × (1-s)/(9.55 × PInput× p),
Wherein, T is the output torque of motor；S is the revolutional slip of motor；P is the number of pole-pairs of motor；The frequency of f1 motor；
PInputFor power input to a machine.
Further, the output torque of motor is obtained by following formula:
T=9.55 × POutput/ n1,
Wherein, PInputFor power input to a machine；N1 is the revolving speed of motor.
Further, the revolving speed of motor is obtained by following formula:
N1=60 × f1/p × (1-s),
Wherein, s is the revolutional slip of motor；F1 is the frequency of motor；
P is the number of pole-pairs of motor.
Further, fan efficiency is η 2, and fan efficiency is obtained by following formula:
η 2=pa × Q/PWind,
Wherein, Pa is the air inlet of fan and the pressure difference of air outlet；Q is the actual measurement air quantity of the air outlet of fan；PWindFor
The input power of the fan blade of fan.
Further, the actual measurement air quantity of fan is obtained by following formula:
Q=k1 × n2,
Wherein, k1 is the fan blade coefficient of fan；N2 is the fan blade revolving speed of fan.
Further, the fan blade revolving speed of fan is obtained by following formula:
N2=k2 × f2,
Wherein, k2 is the revolving speed coefficient of fan；F2 is supply frequency.
Further, fan and motor coaxle are arranged.
Further, frequency of use f, wherein 30HZ≤f≤50HZ.
According to another aspect of the present invention, a kind of air conditioner is provided, air conditioner includes motor and fan, motor and fan
A set of variable-frequency power sources is shared, motor and fan are coaxially disposed, and motor is radiated using variable-frequency motor heat dissipating method, variable-frequency motor heat dissipation
Method is above-mentioned variable-frequency motor heat dissipating method.
It applies the technical scheme of the present invention, variable-frequency motor heat dissipating method includes the motor that motor is determined according to the frequency of motor
Efficiency determines the fan efficiency of fan according to the frequency of fan, and according to electric efficiency and fan efficiency, it is not small to find out fan efficiency
Frequency of use of the frequency of motor when electric efficiency as motor.Since the efficiency of fan efficiency is not less than the effect of motor
Rate, so that the decaying of the winding heat dissipation capacity of motor is lower than the decaying of heating in winding amount, to ensure that it is practical that motor winding temperature rise meets
The requirement used.The frequency of use of motor when determining that motor and fan work at the same time by electric efficiency and fan efficiency, has
Improve to effect the heat dissipation effect of motor.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the relation schematic diagram of electric efficiency and fan efficiency according to the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to herein
Sequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Be to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units not
Those of be necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes, side
The intrinsic other step or units of method, product or equipment.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
Now, the illustrative embodiments according to the application are more fully described with reference to the accompanying drawings.However, these are exemplary
Embodiment can be implemented by many different forms, and should not be construed to be limited solely to embodiment party set forth herein
Formula.It should be understood that it is thoroughly and complete to these embodiments are provided so that disclosure herein, and these are shown
The design of example property embodiment is fully conveyed to those of ordinary skill in the art, in the accompanying drawings, for the sake of clarity, expands layer
With the thickness in region, and make that identical device is presented with like reference characters, thus description of them will be omitted.
As shown in Figure 1, according to an aspect of the invention, there is provided a kind of variable-frequency motor heat dissipating method.According to the present invention
The first embodiment of offer, this method includes that the electric efficiency of motor is determined according to the frequency of motor, true according to the frequency of fan
The fan efficiency for determining fan finds out motor of the fan efficiency not less than electric efficiency when according to electric efficiency and fan efficiency
Frequency of use of the frequency as motor.
In the present embodiment, since the efficiency of fan efficiency is not less than the efficiency of motor, so that the winding heat dissipation capacity of motor
Decaying be lower than heating in winding amount decaying, with ensure motor winding temperature rise meet actual use requirement.Pass through electric efficiency
The frequency of use of motor when determining that motor and fan work at the same time with fan efficiency effectively improves the heat dissipation effect of motor
Fruit.
Second embodiment according to the present invention, this method include determining that the motor of motor is imitated according to the frequency of motor first
Secondly rate determines the fan efficiency of fan according to the frequency of fan, finds out fan efficiency further according to electric efficiency and fan efficiency
Frequency of use of the frequency of motor when not less than electric efficiency as motor.Wherein it is possible to by drawing electric efficiency and wind
The efficiency curve of fan efficiency marks in the same coordinate system, then intuitively just can determine that the frequency of use of motor from figure.I.e.
As shown in Figure 1, in figure solid line η (motor) indicate be variable-frequency motor in the present embodiment electric efficiency, the efficiency of the motor
It is to be drawn according to each Frequency point of motor.What dotted line η (heat dissipation) was indicated in figure is the fan effect in the present embodiment
Rate.It can be concluded that, in the curve between electric machine frequency f1 and f2, fan efficiency, that is, η (heat dissipation) is to be located at motor to imitate from figure
Rate, that is, solid line η (motor) curve top is above-mentioned electricity by the electric efficiency being located above electric efficiency curve is made
Machine service efficiency, under the service efficiency, the decaying of the winding heat dissipation capacity of motor is lower than the decaying of heating in winding amount, to ensure electricity
Machine winding temperature rise meets the requirement of actual use.Preferably, if frequency of use is denoted as f, frequency of use f can be with value
Are as follows: 30HZ≤f≤50HZ.
Third embodiment according to the present invention, this method include determining that the motor of motor is imitated according to the frequency of motor first
Secondly rate determines the fan efficiency of fan according to the frequency of fan, finds out fan efficiency further according to electric efficiency and fan efficiency
Frequency of use of the frequency of motor when not less than electric efficiency as motor.If note electric efficiency is η 1, electric efficiency can be with
It is obtained by following formula:
1=T × 60 η × f1 × (1-s)/(9.55 × PInput× p), wherein T is the output torque of motor, and s is motor
Revolutional slip, p are the number of pole-pairs of motor, the frequency of f1 motor, PInputFor power input to a machine.The output torque of motor by with
Lower formula obtains:
T=9.55 × POutput/ n1, wherein PInputFor power input to a machine, n1 is the revolving speed of motor.
The revolving speed of motor is obtained by following formula:
N1=60 × f1/p × (1-s), wherein s is the revolutional slip of motor, and f1 is the frequency of motor, and p is the extremely right of motor
Number.
Note fan efficiency is η 2, and fan efficiency is obtained by following formula: η 2=Pa × Q/PWind, wherein Pa is fan
The pressure difference of air inlet and air outlet, Q are the actual measurement air quantity of the air outlet of fan, PWindFor the input power of the fan blade of fan.
The actual measurement air quantity of fan is obtained by following formula:
Q=k1 × n2.
Wherein, k1 is the fan blade coefficient of fan, and n2 is the fan blade revolving speed of fan.
The fan blade revolving speed of fan is obtained by following formula:
N2=k2 × f2,
Wherein, k2 is the revolving speed coefficient of fan, and f2 is supply frequency, and supply frequency referred herein is additional variable-frequency power sources
Electric voltage frequency.
Setting through the above way enables the variable-frequency motor to work with fan by a set of power supply, increases
The heat dissipation performance of the variable-frequency motor.
Fourth embodiment according to the present invention, this method include determining that the motor of motor is imitated according to the frequency of motor first
Secondly rate determines the fan efficiency of fan according to the frequency of fan, finds out fan efficiency further according to electric efficiency and fan efficiency
Frequency of use of the frequency of motor when not less than electric efficiency as motor, fan then be arranged and used with motor coaxle
Frequency of use drives fan.If note electric efficiency is η 1, electric efficiency can be obtained by following formula:
1=T × 60 η × f1 × (1-s)/(9.55 × PInput× p), wherein T is the output torque of motor, and s is motor
Revolutional slip, p are the number of pole-pairs of motor, the frequency of f1 motor, PInputFor power input to a machine.
The output torque of motor is obtained by following formula:
T=9.55 × POutput/ n1, wherein PInputFor power input to a machine, n1 is the revolving speed of motor.
The revolving speed of motor is obtained by following formula:
N1=60 × f1/p × (1-s), wherein s is the revolutional slip of motor, and f1 is the frequency of motor, and p is the extremely right of motor
Number.
Note fan efficiency is η 2, and fan efficiency is obtained by following formula:
η 2=pa × Q/PWind, wherein Pa is the air inlet of fan and the pressure difference of air outlet, and Q is the air outlet of fan
Survey air quantity, PWindFor the input power of the fan blade of fan.
The actual measurement air quantity of fan is obtained by following formula:
Q=k1 × n2, wherein k1 is the fan blade coefficient of fan, and n2 is the fan blade revolving speed of fan.
The fan blade revolving speed of fan is obtained by following formula:
N2=k2 × f2, wherein k2 is the revolving speed coefficient of fan, and f2 is supply frequency, and supply frequency referred herein is
The electric voltage frequency of additional variable-frequency power sources.
In the present embodiment, 2 >=η of η 1, wherein 75%≤η 1≤80%.
η 1=F (f)=A × f/PInput, wherein A=T × 60 × (1-s)/(p × 9.55), PInputFor installation after measured value,
The corresponding electric efficiency of each Frequency point can obtain target motor efficiency by adjusting A.It can also be incited somebody to action in the same coordinate system
Electric efficiency curve will form the new Curve Design being located above electric efficiency curve as benchmark, translation motor efficiency curve
Efficiency curve as radiator fan.
According to another aspect of the present invention, a kind of air conditioner is provided, air conditioner includes motor and fan, motor and fan
A set of variable-frequency power sources is shared, motor and fan are coaxially disposed, and motor is radiated using variable-frequency motor heat dissipating method, variable-frequency motor heat dissipation
Method is the variable-frequency motor heat dissipating method in above-described embodiment.This method is the motor for determining motor according to the frequency of motor first
Secondly efficiency determines the fan efficiency of fan according to the frequency of fan, find out fan effect further according to electric efficiency and fan efficiency
Frequency of use of the frequency of motor when rate is not less than electric efficiency as motor, fan then be arranged and adopted with motor coaxle
Fan is driven with frequency of use.
In the present embodiment since the efficiency of fan efficiency is not less than the efficiency i.e. more than or equal to motor, so that motor
The decaying of winding heat dissipation capacity is lower than the decaying of heating in winding amount, to ensure that motor winding temperature rise meets the requirement of actual use.It is logical
It crosses electric efficiency and fan efficiency determines the frequency of use of motor when motor and fan work at the same time, effectively improve motor
Heat dissipation effect.Using the differentiation design method of efficiency curve, realize the decaying of variable-frequency motor winding heat dissipation capacity lower than fever
The decaying of amount, standard three-phase alternating current variable-frequency motor and radiator fan share a set of variable-frequency power sources, solve variable-frequency motor because of heat dissipation
The problem of heat dissipation capacity caused by rotation speed of the fan reduces is reduced, it is ensured that the winding temperature rise of variable-frequency motor is still able to satisfy the reality of air conditioner load
Border uses.
Wherein above-mentioned motor is variable-frequency motor, and converter technique really utilizes motor control principle, by so-called
Frequency converter, motor is controlled, the motor for such control is called variable-frequency motor.
Common variable-frequency motor includes: threephase asynchronous machine, DC brushless motor, AC brushless electric machine and switching magnetic-resistance electricity
Machine etc..
The control principle of variable-frequency motor:
The control strategy of usual variable-frequency motor are as follows: permanent torque control, the above power limitation control of base speed, ultrahigh speed model under base speed
Enclose weak magnetic control.
Base speed: due to that can generate counter electromotive force when motor operating, and the size of counter electromotive force is usually directly proportional to revolving speed.Cause
, when motor runs to certain speed, since counter electromotive force size is identical as applied voltage size, speed at this time is known as base for this
Speed.
Permanent torque control: motor carries out permanent torque control under base speed.Turn of the counter electromotive force E of motor and motor at this time
Rapid-result direct ratio.The output power of motor is directly proportional to the torque of motor and revolving speed product again, therefore power of motor and revolving speed at this time
It is directly proportional.
Power limitation control: after motor is more than that base is fast, make the counter electromotive force base of motor by adjusting motor energization current
Originally it keeps constant, so as to improve the revolving speed of motor.At this point, the output power of motor is held essentially constant, but motor torque with turn
Rapid-result inverse proportion decline.
Weak magnetic control: after motor speed is more than certain numerical value, exciting current is fairly small, cannot adjust again substantially,
Enter weak magnetic at this time and controls the stage.
The speed regulation and control of motor are all kinds of machinery of industrial or agricultural and one of office, the basic technology of people's livelihood electrical equipment.
With the surprising development of power electronic technique, microelectric technique, using the exchange tune of " dedicated variable frequency induction motor+frequency converter "
Fast mode, in speed regulation field, has guided the update for replacing traditional mode of speed regulation with its brilliant performance and economy
The change of the replacement.It is to all trades and professions bring Gospel: mechanical automation degree and production efficiency being made to greatly improve, save
The energy improves product qualification rate and product quality, power-supply system capacity and correspondinglys increase, device miniaturization, increases comfort, just with
Cracking speed replaces traditional mechanical speed governors and DC speed regulation scheme.
Since the particularity and system of variable-frequency power sources are to the demands such as high speed or low-speed running, speed dynamic response, to work
For the motor of power subject, harsh requirement is proposed, is brought to motor new in electromagnetism, structure, insulation various aspects
Project.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of variable-frequency motor heat dissipating method characterized by comprising
The electric efficiency of the motor is determined according to the frequency of motor；
The fan efficiency of the fan is determined according to the frequency of fan；
It is described when finding out the fan efficiency not less than the electric efficiency according to the electric efficiency and the fan efficiency
Frequency of use of the frequency of motor as the motor.
2. variable-frequency motor heat dissipating method according to claim 1, which is characterized in that the electric efficiency is η 1, the electricity
Engine efficiency is obtained by following formula:
1=T × 60 η × f1 × (1-s)/(9.55 × PInput× p),
Wherein,
The T is the output torque of the motor；
The s is the revolutional slip of the motor；
The p is the number of pole-pairs of the motor；
The frequency of motor described in the f1；
The PInputFor the power input to a machine.
3. variable-frequency motor heat dissipating method according to claim 2, which is characterized in that the output torque of the motor by with
Lower formula obtains:
T=9.55 × POutput/ n1,
Wherein,
The PInputFor the power input to a machine；
POutputFor the output power of the motor；
The n1 is the revolving speed of the motor.
4. variable-frequency motor heat dissipating method according to claim 3, which is characterized in that the revolving speed of the motor passes through following public affairs
Formula obtains:
N1=60 × f1/p × (1-s),
Wherein,
The s is the revolutional slip of the motor；
The f1 is the frequency of the motor；
The p is the number of pole-pairs of the motor.
5. variable-frequency motor heat dissipating method according to claim 1, which is characterized in that the fan efficiency is η 2, the wind
Efficiency is fanned to obtain by following formula:
η 2=Pa × Q/PWind,
Wherein,
The Pa is the air inlet of the fan and the pressure difference of air outlet；
The Q is the actual measurement air quantity of the air outlet of the fan；
The PWindFor the input power of the fan blade of the fan.
6. variable-frequency motor heat dissipating method according to claim 5, which is characterized in that the actual measurement air quantity of the fan is logical
Cross following formula acquisition:
Q=k1 × n2,
Wherein,
The k1 is the fan blade coefficient of the fan；
The n2 is the fan blade revolving speed of the fan.
7. variable-frequency motor heat dissipating method according to claim 6, which is characterized in that the fan blade revolving speed of the fan by with
Lower formula obtains:
N2=k2 × f2,
Wherein,
The k2 is the revolving speed coefficient of the fan；
The f2 is supply frequency.
8. variable-frequency motor heat dissipating method according to claim 1, which is characterized in that the fan is set with the motor coaxle
It sets.
9. variable-frequency motor heat dissipating method according to claim 1, which is characterized in that the frequency of use is f, wherein
30HZ≤f≤50HZ。
10. a kind of air conditioner, the air conditioner includes motor and fan, and the motor and the fan share a set of variable-frequency electric
Source, the motor and the fan are coaxially disposed, which is characterized in that the motor is radiated using variable-frequency motor heat dissipating method, institute
State variable-frequency motor heat dissipating method variable-frequency motor heat dissipating method as claimed in any one of claims 1 to 9.
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|---|---|---|---|---|
| EP0812052A1 (en) * | 1996-06-04 | 1997-12-10 | A. Dr. Stoev | Frequency converter for drive device |
| JP2005124304A (en) * | 2003-10-16 | 2005-05-12 | Toshiba Corp | Rotary electric machine |
| CN101430167A (en) * | 2008-11-28 | 2009-05-13 | 中国大唐集团科技工程有限公司 | Method and system for improving electric motor output transfer efficiency of direct air cooling system |
| CN202840831U (en) * | 2012-11-06 | 2013-03-27 | 宁波华誉汽车电机有限公司 | High-efficiency air cooling variable frequency motor |
| CN103430433A (en) * | 2011-03-29 | 2013-12-04 | 希尔莱特有限责任公司 | Method and apparatus for operating a motor with optimized efficiency |
| CN104462768A (en) * | 2014-11-06 | 2015-03-25 | 上海电气电站设备有限公司 | Large stream-turbine generator axial flow fan efficiency and power consumption determining method |
-
2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0812052A1 (en) * | 1996-06-04 | 1997-12-10 | A. Dr. Stoev | Frequency converter for drive device |
| JP2005124304A (en) * | 2003-10-16 | 2005-05-12 | Toshiba Corp | Rotary electric machine |
| CN101430167A (en) * | 2008-11-28 | 2009-05-13 | 中国大唐集团科技工程有限公司 | Method and system for improving electric motor output transfer efficiency of direct air cooling system |
| CN103430433A (en) * | 2011-03-29 | 2013-12-04 | 希尔莱特有限责任公司 | Method and apparatus for operating a motor with optimized efficiency |
| CN202840831U (en) * | 2012-11-06 | 2013-03-27 | 宁波华誉汽车电机有限公司 | High-efficiency air cooling variable frequency motor |
| CN104462768A (en) * | 2014-11-06 | 2015-03-25 | 上海电气电站设备有限公司 | Large stream-turbine generator axial flow fan efficiency and power consumption determining method |
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| CN106026524A (en) | 2016-10-12 |
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