CN106301132B - Permanent magnet synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator - Google Patents
Permanent magnet synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator Download PDFInfo
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- CN106301132B CN106301132B CN201610925769.3A CN201610925769A CN106301132B CN 106301132 B CN106301132 B CN 106301132B CN 201610925769 A CN201610925769 A CN 201610925769A CN 106301132 B CN106301132 B CN 106301132B
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- Control Of Ac Motors In General (AREA)
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Abstract
The embodiment of the present invention proposes a kind of permanent magnet synchronous motor power calculation algorithms, comprising: obtains the current three-phase electricity flow valuve of motor；Motor speed is estimated according to current three-phase electricity flow valuve；The power of motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine, constant of the machine is related to air-gap flux amount and torque constant.The three-phase current that the embodiment of the present invention only passes through acquisition motor can calculate the power of motor, therefore not need to increase additional power measurement module, effectively reduce the manufacturing cost of permanent magnet synchronous motor, refrigerator controller and refrigerator.
Description
Technical field
The present embodiments relate to motor power calculation technology more particularly to a kind of permanent magnet synchronous motor power calculation skills
Art.
Background technique
Permanent magnet synchronous motor is the synchronous motor that synchronous rotary magnetic field is generated by permanent magnet excitation.When stator side is passed through three-phase
Symmetrical current, since threephase stator differs 120 ° on spatial position, so threephase stator electric current generates rotary magnetic in space
, rotor is moved in rotating excitation field by electromagnetic force.
Under certain abnormal conditions, it may appear that permanent magnet synchronous motor runs on higher-wattage, and electric current is larger at this time, but does not have
Have and reach overcurrent protection value, if longtime running will lead to the damage of permanent magnet synchronous motor, each first device of controller in this state
The part service life is greatly lowered.Therefore permanent magnet synchronous motor is required power setting in a certain range at present, this just needs to find one kind
Method can accurately calculate power.
Currently, power calculation algorithms are by increasing power measurement module, permanent magnet synchronous motor power supply line is same to permanent magnetism
Before walking motor power supply, first passes through power measurement module and carry out relevant data acquisition calculating.Due to needing to increase power measurement mould
Block increases the manufacturing cost of permanent magnet synchronous motor.
Summary of the invention
The embodiment of the present invention proposes a kind of permanent magnet synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator, with
The manufacturing cost of permanent magnet synchronous motor, refrigerator controller and refrigerator is effectively reduced.
In a first aspect, the embodiment of the invention provides a kind of permanent magnet synchronous motor power calculation algorithms, comprising:
Obtain the current three-phase electricity flow valuve of motor；
Motor speed is estimated according to current three-phase electricity flow valuve；
The power of motor, constant of the machine and gas are calculated according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine
Gap magnetic flux and torque constant are related.
Second aspect, the embodiment of the invention provides a kind of permanent magnet synchronous motor output computation devices, comprising:
Module is obtained, for obtaining current three-phase electricity flow valuve of the motor under predetermined power；
Estimation block, for estimating motor speed according to current three-phase electricity flow valuve；
Computing module, for calculating the power of motor according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine,
Constant of the machine is related to air-gap flux amount and torque constant.
The third aspect, the embodiment of the invention provides a kind of refrigerator controller, including permanent magnetism provided by the above embodiment are same
Walk motor power calculation device.
Fourth aspect, the embodiment of the invention provides a kind of refrigerators, including permanent magnet synchronous motor and above-described embodiment to provide
Refrigerator controller, refrigerator controller control permanent magnet synchronous motor operating.
The embodiment of the invention provides a kind of permanent magnet synchronous motor power calculation algorithms, device, refrigerator controller and refrigerator,
The three-phase current that this method only passes through acquisition motor can calculate the power of motor, can be without increasing additional measurement
In the case where module, the actual power of motor is accurately calculated, can be realized and real-time function is carried out to motor under different operating conditions
Rate protection.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention one provides；
Fig. 2 is the permanent magnet synchronous motor control program block diagram for the refrigerator that the embodiment of the present invention one provides；
Fig. 3 is the flow diagram of permanent magnet synchronous motor power calculation algorithms provided by Embodiment 2 of the present invention；
Fig. 4 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention three provides；
Fig. 5 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention four provides；
Fig. 6 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention five provides；
Fig. 7 is the structural schematic diagram for the permanent magnet synchronous motor output computation device that the embodiment of the present invention six provides；
Fig. 8 is the structural schematic diagram for the refrigerator that the embodiment of the present invention eight provides.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of flow diagram for permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention one provides, this
Embodiment is applicable to the case where calculating permanent magnet synchronous motor power by using the three-phase current of permanent magnet synchronous motor, this method
Can be executed by permanent magnet synchronous motor output computation device provided in an embodiment of the present invention, the device can be used software and/or
The mode of hardware is realized.
As shown in Figure 1, permanent magnet synchronous motor power calculation algorithms, comprising:
S110, the current three-phase electricity flow valuve of motor is obtained.
Permanent magnet synchronous motor includes stator and rotor two large divisions, and the three-phase current of stator is respectively Ia、IbAnd Ic.Three-phase
The acquisition of electric current can realize that sample circuit can be made of sampling resistor by sample circuit, can also be by other circuit structures
At, it may also be necessary to including amplifying circuit, processing is amplified to the signal after sampling.The three-phase current signal directly sampled
Or the three-phase current signal by amplification can also be converted into digital signal by A/D converter part.
S120, motor speed is estimated according to current three-phase electricity flow valuve.
Fig. 2 is the permanent magnet synchronous motor control program block diagram of refrigerator, as shown in Fig. 2, being estimated according to current three-phase electricity flow valuve
Motor speed can specifically include: three-phase current Ia、IbAnd IcIt converts to obtain the I under the static alpha-beta coordinate system of two-phase by CLARKα
And Iβ, to IαAnd IβPARK is carried out to convert to obtain two-phase rotation d-q coordinate system IdAnd Iq.Further according to IdAnd Iq, utilize counter electromotive force
Method estimates motor speed W.
S130, the power that motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine, constant of the machine
It is related to air-gap flux amount and torque constant.
As shown in Fig. 2, exciting currentWherein IdAnd IqIt is calculated value in S120.Further according to electricity
Machine power P=A × IS× W calculates the output power of permanent magnet synchronous motor.Wherein, P is output power of motor, and W is in S120
The estimation motor speed estimated, ISFor aforementioned calculated exciting current, A is constant of the machine, and constant of the machine can be motor
The value that producer provides is also possible to the value after survey calculation.
The embodiment of the invention provides a kind of permanent magnet synchronous motor power calculation algorithms, this method, which only passes through, obtains motor
Three-phase current can calculate the power of motor, can be without accurately counting in the case where increasing additional measurement module
The actual power for calculating motor can be realized and carry out realtime power protection to motor under different operating conditions.
Further include the control program of motor speed in Fig. 2, including receive rotating speed of target W*, by the PI ratio with feedback
Integral controller generates target exciting current Is*, target exciting current Is* the mesh under d-q coordinate system is obtained by Sine and cosine transform
Mark Id(Id *) and target Iq(Iq *), Id *And Iq *It is obtained under d-q coordinate system after the PI proportional and integral controller with feedback respectively
Target Vd(Vd *) and target Vq(Vq *), Vd *And Vq *The target V under alpha-beta coordinate system is obtained by PARK inverse transformationα(Vα *) and mesh
Mark Vβ(Vβ *), Vα *And Vβ *By SVPWM (Space Vector Pulse Width Modulation, space vector pulse width tune
System) control inverter, and then control permanent magnet synchronous motor.
Embodiment two
Fig. 3 is the flow diagram of permanent magnet synchronous motor power calculation algorithms provided by Embodiment 2 of the present invention.This implementation
Example is optimized based on above-described embodiment, in the present embodiment, before obtaining the current three-phase electricity flow valuve of motor, also
Include the following steps: the reference three-phase electricity flow valuve obtained the motor under predetermined power and with reference to motor speed；According to default
Power calculates the constant of the machine with reference to three-phase electricity flow valuve and with reference to motor speed.
Correspondingly, permanent magnet synchronous motor power calculation algorithms provided by the present embodiment, comprising:
S210 obtains reference three-phase electricity flow valuve of the motor under predetermined power and with reference to motor speed.
In the present embodiment, before to permanent magnet synchronous motor power calculation, need to calculate the constant of the machine of motor.To mention
For calculating the constant of the machine of permanent magnet synchronous motor power.For different permanent magnet synchronous motors, need all to calculate every motor
Its corresponding constant of the machine.The parameter of electric machine can be calculated under experiment condition by power, three-phase electricity flow valuve and motor speed
It obtains.In laboratory environments, three-phase electricity flow valuve and motor speed under predetermined power can accurately be measured.Illustratively,
It can be loaded to motor by means of testboard so that the output power of motor reaches the power protection value of setting, i.e., it is default
Power measures the reference three-phase electricity flow valuve of motor at this time with the instrument of the test electric current such as oscillograph or power instrument, that is, refers to three-phase
Current value measures motor speed with the instrument of the measurement revolving speed such as tachometer, that is, refers to motor speed.
S220, the constant of the machine is calculated according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed.
By electromagnetic power formula: P=Te× Ω formula (1)
Wherein TeFor electromagnetic torque, Ω is the mechanical angular speed of rotor, this electromagnetic power is that the electromagnetism of motor turns
Square is to mechanical output made by mechanical load, the i.e. output power of motor.
By Formula of Electromagnetic: Te=CT×φ×IsFormula (2)
Wherein, CTFor torque constant, φ is air-gap flux amount, IsFor exciting current.
Again
Wherein, W is electromechanics revolving speed, and unit r/min, formula (2) and formula (3), which are substituted into formula (1), to be obtainedEnable constant of the machineObtain electromagnetic power P=A × IS× W, due to motor
Loss power is smaller, can be approximately electromagnetic power the output power of motor.That is,
Power of motor P=A × IS× W formula (4)
By motor predetermined power value at this time, with reference to three-phase electricity flow valuve and formula (4) are substituted into reference to motor speed value can count
Calculate constant of the machine A value at this time.
S230, the current three-phase electricity flow valuve of motor is obtained.
S240, motor speed is estimated according to current three-phase electricity flow valuve.
S250, the power that motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
The present embodiment tests the constant of the machine A value obtained by increasing under the power protection value of setting, for motor
The accuracy of motor power calculation can be improved in power calculation.
It should be noted that step: obtaining reference three-phase electricity flow valuve of the motor under predetermined power and with reference to motor
Revolving speed；The constant of the machine is calculated according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed.Acquisition can be limited to
It before the current three-phase electricity flow valuve of motor, can also be limited to according to predetermined power, turn with reference to three-phase electricity flow valuve and with reference to motor
Speed calculates the either step before the constant of the machine.
Embodiment three
Fig. 4 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention three provides.This implementation
Example is optimized based on above-described embodiment, in the present embodiment, by the ginseng for obtaining the motor under predetermined power
It examines three-phase electricity flow valuve specifically to optimize are as follows: obtain that multiple preset rotation speeds of the motor under predetermined power are corresponding multiple to refer to three
Phase current values；According to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed to calculate the constant of the machine specific by described
Optimization are as follows: corresponding multiple more with reference to three-phase electricity flow valuve and the calculating of multiple preset rotation speeds according to predetermined power, multiple preset rotation speeds
The corresponding multiple constants of the machine of a preset rotation speed；And it will be according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine meter
The power of motor is calculated, it is specific to optimize are as follows: to estimate that revolving speed chooses corresponding constant of the machine according to motor；According to current three-phase current
Value, estimation motor speed and corresponding constant of the machine calculate the power of motor.
Correspondingly, permanent magnet synchronous motor power calculation algorithms provided by the present embodiment, comprising:
The multiple preset rotation speeds of S310, the acquisition motor under predetermined power are corresponding multiple with reference to three-phase electricity flow valuve.
Since constant of the machine is related to air-gap flux amount and torque constant, under different rotating speeds, constant of the machine can be generated
Corresponding variation.In the present embodiment, before to permanent magnet synchronous motor power calculation, it is corresponding to need to calculate multiple preset rotation speeds
Multiple constants of the machine, with provide calculate permanent magnet synchronous motor power constant of the machine.The parameter of electric machine can be in experiment condition
Under, it is obtained by the calculating of power, three-phase electricity flow valuve and motor speed.In laboratory environments, it can accurately measure in default function
Three-phase electricity flow valuve under rate.Illustratively, it can be loaded to motor by means of testboard so that the output power of motor reaches
It to the power protection value of setting, i.e. predetermined power, and sets motor and is rotated respectively with different preset rotation speeds, with oscillograph or function
The instrument of the test electric current such as rate instrument measures the three-phase electricity flow valuve of the corresponding motor of each preset rotation speed, that is, refers to three-phase electricity flow valuve.
S320, multiple three-phase electricity flow valuve and multiple preset rotation speeds are referred to according to predetermined power, multiple preset rotation speeds are corresponding
Calculate the corresponding multiple constants of the machine of multiple preset rotation speeds.
By motor predetermined power value at this time, formula (4) are substituted into reference to three-phase electricity flow valuve and preset rotation speed value can calculate
Constant of the machine A value at this time.The measurement and calculating that are carried out respectively under multiple preset rotation speeds with reference to three-phase electricity flow valuve can be obtained
To the value of the corresponding multiple constant of the machine A of multiple preset rotation speeds.
S330, the current three-phase electricity flow valuve of motor is obtained.
S340, motor speed is estimated according to current three-phase electricity flow valuve.
S350, estimate that revolving speed chooses corresponding constant of the machine according to motor.
Motor is estimated that multiple preset rotation speeds in revolving speed and S310 are compared, immediate preset rotation speed can be chosen
Constant of the machine value of the value of corresponding constant of the machine A as power calculation.
S360, the power that motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
The constant of the machine value that step S350 is chosen substitutes into motor power calculation formula (4), obtains the power of motor.
The present embodiment is by testing the multiple constants of the machine obtained under the power protection value of setting under multiple preset rotation speeds
A value is used for the power calculation of motor further according to the value that estimation motor speed chooses suitable constant of the machine A, can further mention
The accuracy of high motor power calculation.
It should be noted that step: obtaining that multiple preset rotation speeds of the motor under predetermined power are corresponding to refer to three
Phase current values；It is corresponding multiple with reference to three-phase electricity flow valuve and the calculating of multiple preset rotation speeds according to predetermined power, multiple preset rotation speeds
The corresponding constant of the machine of multiple preset rotation speeds.It can be limited to before obtaining the current three-phase electricity flow valuve of motor, root can also be limited to
The either step before the constant of the machine is calculated according to predetermined power, with reference to three-phase electricity flow valuve and preset rotation speed.
Optionally, in above-mentioned permanent magnet synchronous motor power calculation algorithms, the range of preset rotation speed is 1200~4200r/
min.The range of speeds covers the working speed of permanent magnet synchronous motor under normal conditions, only carries out constant of the machine in the range
The measurement of value reduces the workload of measurement.
Optionally, in above-mentioned permanent magnet synchronous motor power calculation algorithms, preset rotation speed is 180 × M+1200r/min, wherein
M is the integer more than or equal to 1.By measuring a constant of the machine value every 180r/min, the work of measurement is further reduced
Amount.
Example IV
Fig. 5 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention four provides.This implementation
Example is optimized based on above-described embodiment, in the present embodiment, by the ginseng for obtaining the motor under predetermined power
It examines three-phase electricity flow valuve specifically to optimize are as follows: it is corresponding multiple with reference to three-phase to obtain the motor multiple predeterminated voltages under predetermined power
Current value and refer to motor speed；By it is described according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed calculate described in
Constant of the machine specifically optimizes are as follows: calculates according to predetermined power, multiple reference three-phase electricity flow valuves and with reference to motor speed multiple default
The corresponding multiple constants of the machine of voltage；And by described according to the current three-phase electricity flow valuve, estimation motor speed and constant of the machine
The power for calculating the motor, advanced optimizes are as follows: obtains motor current voltage value, chooses corresponding electricity according to current voltage value
Machine constant；The power of the motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
Correspondingly, permanent magnet synchronous motor power calculation algorithms provided by the present embodiment, comprising:
S410, acquisition motor multiple predeterminated voltages under predetermined power are corresponding multiple with reference to three-phase electricity flow valuves and with reference to electricity
Machine revolving speed.
Since constant of the machine is related to motor input voltage, for different input voltages, constant of the machine can be generated accordingly
Variation.In the present embodiment, before to permanent magnet synchronous motor power calculation, it is corresponding more to need to calculate multiple predeterminated voltages
A constant of the machine, to provide the constant of the machine for calculating permanent magnet synchronous motor power.The parameter of electric machine can lead under experiment condition
Overpower, three-phase electricity flow valuve and motor speed calculating obtain.In laboratory environments, it can accurately measure under predetermined power
Three-phase electricity flow valuve and motor speed.
S420, multiple predeterminated voltages pair are calculated according to predetermined power, multiple reference three-phase electricity flow valuves and with reference to motor speed
The multiple constants of the machine answered.
S430, motor current voltage value is obtained.
The acquisition of current voltage value can realize that sample circuit can be made of sampling resistor by sample circuit, can also
To be made of other circuits.
S440, corresponding constant of the machine is chosen according to current voltage value.
Multiple predeterminated voltages in the current voltage and S410 that obtain in S430 are compared, can be chosen immediate
Constant of the machine value of the value of the corresponding constant of the machine A of predeterminated voltage as power calculation.
S450, the current three-phase electricity flow valuve of motor is obtained
S460, motor speed is estimated according to current three-phase electricity flow valuve
S470, the power that motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
The constant of the machine value that step S440 is chosen substitutes into motor power calculation formula, obtains the power of motor.
The present embodiment is multiple with reference to three-phase electricity flow valuve and with reference to motor speed under multiple predeterminated voltages by measuring, and obtains
The corresponding multiple constants of the machine of multiple predeterminated voltages, can prevent voltage change from electric current being caused to change, so that power
Calculated value error is smaller, also allows for that motor power calculation method can be applied to those spread of voltage and voltage is lower in this way
Area.
It should be noted that step: it is corresponding multiple with reference to three-phase to obtain motor multiple predeterminated voltages under predetermined power
Current value and refer to motor speed；It is calculated according to predetermined power, multiple reference three-phase electricity flow valuves and with reference to motor speed multiple pre-
If the corresponding multiple constants of the machine of voltage.It can be limited to before obtaining motor current voltage value, can also be limited to according to current
Voltage value chooses the either step before corresponding constant of the machine.Step: current voltage value is obtained；It is chosen according to current voltage value
Corresponding constant of the machine.It can be limited to before obtaining the current three-phase electricity flow valuve of motor, can also be limited to according to predetermined power, ginseng
It examines three-phase electricity flow valuve and preset rotation speed calculates either step before the constant of the machine.
Optionally, in above-mentioned permanent magnet synchronous motor power calculation algorithms, multiple predeterminated voltages include: 1.1 times of voltage ratings,
0.85 times of voltage rating or 0.73 times of voltage rating.Three constants of the machine are obtained by measuring aforementioned three predeterminated voltages, are reduced
The workload of constant of the machine measurement.
Embodiment five
Fig. 6 is the flow diagram for the permanent magnet synchronous motor power calculation algorithms that the embodiment of the present invention five provides.This implementation
Example is optimized based on above-described embodiment, in the present embodiment, by the ginseng for obtaining the motor under predetermined power
It examines three-phase electricity flow valuve specifically to optimize are as follows: it is corresponding to obtain the motor multiple preset rotation speeds under predetermined power, multiple predeterminated voltages
Multiple groups refer to three-phase electricity flow valuve；By it is described according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed calculate described in
Constant of the machine has optimization are as follows: obtains multiple default turns with reference to three-phase electricity flow valuve, multiple preset rotation speeds according to predetermined power, multiple groups
The corresponding multiple groups constant of the machine of fast and multiple predeterminated voltages.
Correspondingly, by permanent magnet synchronous motor power calculation algorithms provided by the present embodiment, comprising:
S510, the corresponding multiple groups reference of the motor multiple preset rotation speeds under predetermined power and multiple predeterminated voltages is obtained
Three-phase electricity flow valuve.
S520, according to predetermined power, multiple groups with reference to three-phase electricity flow valuve and multiple preset rotation speeds obtain multiple preset rotation speeds and
The corresponding multiple groups constant of the machine of multiple predeterminated voltages.
S530, motor current voltage value is obtained.
S540, corresponding constant of the machine group is chosen according to current voltage value.
S550, the current three-phase electricity flow valuve of motor is obtained.
S560, motor speed is estimated according to current three-phase electricity flow valuve.
S570, estimate that revolving speed and constant of the machine group choose corresponding constant of the machine according to motor.
S580, the power that motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
The present embodiment obtains multiple groups electricity by the reference three-phase electricity flow valuve of multiple preset rotation speeds under the multiple predeterminated voltages of measurement
Machine constant, the further expansion application range of power calculation algorithms, the power calculation for not only having prevented voltage to occur is abnormal, but also increases
The accuracy of power calculation is added.
Embodiment six
The embodiment of the invention provides a kind of permanent magnet synchronous motor output computation devices, referring to FIG. 7, it is of the invention real
A kind of permanent magnet synchronous motor output computation device schematic diagram of the offer of example six is provided.
The permanent magnet synchronous motor output computation device, comprising:
Module 61 is obtained, for obtaining current three-phase electricity flow valuve of the motor under predetermined power；
Estimation block 62, for estimating motor speed according to current three-phase electricity flow valuve；
Computing module 63, for calculating the function of motor according to current three-phase electricity flow valuve, estimation motor speed and constant of the machine
Rate, constant of the machine are related to air-gap flux amount and torque constant.
The embodiment of the invention provides a kind of permanent magnet synchronous motor output computation device, which, which only passes through, obtains motor
Three-phase current can calculate the power of motor, can be without accurately counting in the case where increasing additional measurement module
The actual power for calculating motor can be realized and carry out realtime power protection to motor under different operating conditions.
Optionally, above-mentioned permanent magnet synchronous motor output computation device further include:
Reference data obtains module 65, for obtaining reference three-phase electricity flow valuve of the motor under predetermined power and referring to motor
Revolving speed；Constant of the machine computing module 64, described in being calculated according to predetermined power, with reference to three-phase electricity flow valuve and reference motor speed
Constant of the machine.
Optionally, in above-mentioned permanent magnet synchronous motor output computation device, reference data obtains module and is used for:
It is corresponding multiple with reference to three-phase electricity flow valuve to obtain multiple preset rotation speeds of the motor under predetermined power；
Correspondingly, constant of the machine computing module is used for:
It is corresponding multiple more with reference to three-phase electricity flow valuve and the calculating of multiple preset rotation speeds according to predetermined power, multiple preset rotation speeds
The corresponding multiple constants of the machine of a preset rotation speed；
Computing module is used for:
Estimate that revolving speed chooses corresponding constant of the machine according to motor；
The power of motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
Optionally, in above-mentioned permanent magnet synchronous motor output computation device, the range of preset rotation speed is 1200~4200r/
min。
Optionally, in above-mentioned permanent magnet synchronous motor output computation device, preset rotation speed is 1200+180M r/min, wherein M
For the integer more than or equal to 1.
Optionally, in above-mentioned permanent magnet synchronous motor output computation device, reference data obtains module and is used for:
It is corresponding multiple with reference to three-phase electricity flow valuve and with reference to motor turn to obtain motor multiple predeterminated voltages under predetermined power
Speed；Correspondingly, constant of the machine computing module is used for: according to predetermined power, multiple reference three-phase electricity flow valuves and referring to motor speed
Calculate the corresponding multiple constants of the machine of multiple predeterminated voltages；Computing module is used for: choosing corresponding motor according to current voltage value
Constant；The power of the motor is calculated according to current three-phase electricity flow valuve, estimation motor speed and corresponding constant of the machine.
Optionally, in above-mentioned permanent magnet synchronous motor output computation device, multiple predeterminated voltages include: 1.1 times of voltage ratings,
0.85 times of voltage rating or 0.73 times of voltage rating.
Permanent magnet synchronous motor output computation device provided by the embodiment of the present invention can be used for executing any implementation of the invention
The permanent magnet synchronous motor power calculation algorithms that example provides, have corresponding functional module, realize identical beneficial effect.
Embodiment seven
The embodiment of the invention provides a kind of refrigerator controllers, which is characterized in that according to above-mentioned permanent magnet synchronous motor power
Calculation method carries out power calculation.
Embodiment eight
The embodiment of the invention provides a kind of refrigerators, referring to FIG. 8, it is a kind of refrigerator that the embodiment of the present invention eight provides
Schematic diagram.
A kind of refrigerator 71 may include permanent magnet synchronous motor 712, can also include above-mentioned refrigerator controller 711, refrigerator control
Device 711 processed controls permanent magnet synchronous motor 712 and operates.
The embodiment of the invention provides a kind of refrigerator controller and refrigerators, by using permanent magnet synchronous motor power calculation side
Method only can calculate the power of motor by obtaining the three-phase current of motor, therefore not need to increase additional power survey
Module is measured, while realizing the accurate realtime power for calculating motor, effectively reduces the manufacture of refrigerator controller and refrigerator
Cost.
Obviously, it will be understood by those skilled in the art that each module or each step of aforementioned present invention can pass through institute as above
The equipment stated is implemented.Optionally, the embodiment of the present invention can be realized with the program that computer installation can be performed, so as to incite somebody to action
They store and are executed by a processor in the storage device, and the program can store in a kind of computer readable storage medium
In, storage medium mentioned above can be read-only memory, disk or CD etc.；Or they are fabricated to each collection
At circuit module, or single integrated circuit module is maked multiple modules or steps in them to realize.In this way, this hair
The bright combination for being not limited to any specific hardware and software.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (14)
1. a kind of permanent magnet synchronous motor power calculation algorithms characterized by comprising
Obtain reference three-phase electricity flow valuve of the motor under predetermined power and with reference to motor speed；
The constant of the machine is calculated according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed；
Obtain the current three-phase electricity flow valuve of the motor；
Motor speed is estimated according to the current three-phase electricity flow valuve；
The power of the motor, the motor are calculated according to the current three-phase electricity flow valuve, estimation motor speed and constant of the machine
Constant is related to air-gap flux amount and torque constant.
2. the method according to claim 1, wherein the reference three for obtaining the motor under predetermined power
Phase current values, comprising:
It is corresponding multiple with reference to three-phase electricity flow valuve to obtain multiple preset rotation speeds of the motor under predetermined power；
Correspondingly, described calculate the constant of the machine, packet according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed
It includes:
It is corresponding multiple multiple pre- with reference to three-phase electricity flow valuve and the calculating of multiple preset rotation speeds according to predetermined power, multiple preset rotation speeds
If the corresponding multiple constants of the machine of revolving speed；
The power that the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and constant of the machine, comprising:
Estimate that revolving speed chooses corresponding constant of the machine according to the motor；
The function of the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and the corresponding constant of the machine
Rate.
3. according to the method described in claim 2, it is characterized in that, the range of the preset rotation speed is
1200~4200r/min.
4. according to the method described in claim 3, it is characterized in that, the preset rotation speed is 180 × M+1200r/min, wherein M
For the integer more than or equal to 1.
5. the method according to claim 1, wherein the reference three for obtaining the motor under predetermined power
Phase current values, comprising:
It is corresponding multiple with reference to three-phase electricity flow valuve and with reference to motor turn to obtain the motor multiple predeterminated voltages under predetermined power
Speed；
Correspondingly, described obtain the constant of the machine according to predetermined power, with reference to three-phase electricity flow valuve and with reference to motor speed, wrap
It includes:
According to predetermined power, multiple the corresponding multiple electricity of multiple predeterminated voltages are calculated with reference to three-phase electricity flow valuve and with reference to motor speed
Machine constant；
The power that the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and constant of the machine, comprising:
The motor current voltage value is obtained, corresponding constant of the machine is chosen according to the current voltage value；
The function of the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and the corresponding constant of the machine
Rate.
6. according to the method described in claim 5, it is characterized in that, the multiple predeterminated voltage includes:
1.1 times of voltage ratings, 0.85 times of voltage rating or 0.73 times of voltage rating.
7. a kind of permanent magnet synchronous motor output computation device characterized by comprising
Reference data obtains module, turns for obtaining reference three-phase electricity flow valuve and reference motor of the motor under predetermined power
Speed；
Constant of the machine computing module, for calculating the electricity according to predetermined power, with reference to three-phase electricity flow valuve and reference motor speed
Machine constant；
Module is obtained, for obtaining current three-phase electricity flow valuve of the motor under predetermined power；
Estimation block, for estimating motor speed according to the current three-phase electricity flow valuve；
Computing module, for calculating the motor according to the current three-phase electricity flow valuve, estimation motor speed and constant of the machine
Power, the constant of the machine are related to air-gap flux amount and torque constant.
8. device according to claim 7, which is characterized in that the reference data obtains module and is used for:
It is corresponding multiple with reference to three-phase electricity flow valuve to obtain multiple preset rotation speeds of the motor under predetermined power；
Correspondingly, constant of the machine computing module is used for:
It is corresponding multiple multiple pre- with reference to three-phase electricity flow valuve and the calculating of multiple preset rotation speeds according to predetermined power, multiple preset rotation speeds
If the corresponding multiple constants of the machine of revolving speed；
The computing module is used for:
Estimate that revolving speed chooses corresponding constant of the machine according to the motor；
The function of the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and the corresponding constant of the machine
Rate.
9. device according to claim 8, which is characterized in that the range of the preset rotation speed is 1200~4200r/min.
10. device according to claim 9, which is characterized in that the preset rotation speed is 1200+180M r/min, wherein M
For the integer more than or equal to 1.
11. device according to claim 7, which is characterized in that the reference data obtains module and is used for:
It is corresponding multiple with reference to three-phase electricity flow valuve and with reference to motor turn to obtain the motor multiple predeterminated voltages under predetermined power
Speed；
Correspondingly, the constant of the machine computing module is used for:
According to predetermined power, multiple the corresponding multiple electricity of multiple predeterminated voltages are calculated with reference to three-phase electricity flow valuve and with reference to motor speed
Machine constant；
The computing module is used for:
Corresponding constant of the machine is chosen according to the current voltage value；
The function of the motor is calculated according to the current three-phase electricity flow valuve, estimation motor speed and the corresponding constant of the machine
Rate.
12. device according to claim 11, which is characterized in that the multiple predeterminated voltage includes:
1.1 times of voltage ratings, 0.85 times of voltage rating or 0.73 times of voltage rating.
13. a kind of refrigerator controller, which is characterized in that including permanent magnet synchronous motor function described in any one of claim 7~12
Rate computing device.
14. a kind of refrigerator, including permanent magnet synchronous motor, which is characterized in that further include: the control of refrigerator described in claim 13
Device, the refrigerator controller is for controlling the permanent magnet synchronous motor operating.
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