CN104617554B - The guard method for preventing frequency-changeable compressor from demagnetizing - Google Patents
The guard method for preventing frequency-changeable compressor from demagnetizing Download PDFInfo
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Abstract
A kind of guard method for preventing frequency-changeable compressor from demagnetizing; including the control chip being arranged on frequency-changeable compressor; control the motor temperature t of chip detection compressor; control chip be provided with the corresponding protective current Ipt of motor temperature t, control compressor maximum starting current Isatmax and compressor operating electric current Irun by the way that chip is controlled to detect motor temperature t.The present invention is by setting the relation of the motor temperature t and protective current Ipt of frequency-changeable compressor; compressor maximum starting current Isatmax and compressor operating electric current Irun is controlled using chip detection motor temperature t is controlled; anti-back magnet function is played frequency-changeable compressor in realization, while expands its range of operation；Protective current Ipt is made to be more than compressor maximum starting current Isatmax, improve the anti-demagnetization capability of compressor and expands the application range of magnet；It has the characteristics that simple and reasonable, service life is long, production of low cost and easy to process.
Description
Related application
It is on January 5th, 2012, entitled " guard method for preventing frequency-changeable compressor from demagnetizing ", Shen the applying date that the application, which is,
It please number divisional application for being 201210002737.8.
Technical field
The present invention relates to a kind of guard methods for preventing frequency-changeable compressor from demagnetizing.
Background technology
The magnetic raw material that existing compressor uses for ferrite lattice, rear earth element nd and iron, boron compound etc.
Magnetisable material, when electric current its maximum current born more than these substances, demagnetization phenomenon will occur in this this substance.
Referring to Fig. 6, ordinate is the demagnetization current of ferrite frequency-changeable compressor in figure, and abscissa is its magnet temperature.Figure
In temperature for -20 spend when, the minimum 10APK of demagnetization current；When temperature is 130 degree, demagnetization current is up to 24.4APK,
It is drawn according to Fig. 6：With the rising of temperature, the anti-demagnetization current of ferrite frequency-changeable compressor also rises.
Referring to Fig. 7, ordinate is the demagnetization current of rare earth frequency-changeable compressor in figure, and abscissa is its magnet temperature.In figure,
When temperature is spent for -20, demagnetization current is up to 40APK；When temperature is 130 degree, the minimum 25APK of demagnetization current can be with
It draws, with the rising of temperature, the demagnetization current of rare earth frequency-changeable compressor is also smaller.
Chinese patent literature CN201126959Y discloses a kind of protection for preventing compressor from demagnetizing on October 1st, 2008
Circuit, including comparator and control chip, it is characterised in that：Further include resistance R1, the R2 being connected in series, the resistance R1 and electricity
Source connects, R2 ground connection, and the resistance ratio of R1 and R2 are not less than (U/RSIDCOC) -1, wherein, U is the electricity at resistance R1, R2 both ends
Pressure, Rs are the resistance value of the cement resistor of driven compressor module, and IDCOC is compressor maximum demagnetization current；The comparator
Input terminal one end is connected with R2, and the other end is connected with the cement resistor, and output terminal is connected with control chip.It is said that the structure
It solves the problems, such as that compressor demagnetizes in instantaneous high current, ensure that the normal operation of compressor, and with simple in structure,
The characteristics of at low cost.But caused by the species difference of compressor poor universality, reduce its reliability.Therefore, having must
It is further improved and perfect.
The content of the invention
The purpose of the present invention, which is intended to provide, a kind of simple and reasonable, versatile and high reliability prevents frequency conversion from compressing
The guard method of machine demagnetization, to overcome shortcoming of the prior art.
By a kind of guard method for preventing frequency-changeable compressor from demagnetizing of this purpose design, including being arranged on frequency-changeable compressor
Control chip, the motor temperature t of control chip detection compressor, structure feature is that the control chip is provided with and motor
The corresponding protective current Ipt of temperature t control compressor maximum starting current by the way that chip is controlled to detect motor temperature t
Isatmax and compressor operating electric current Irun.
The guard method for preventing frequency-changeable compressor from demagnetizing, it is characterized in that described comprise the following steps：
1) compressor start stage, control chip detect the motor temperature t of compressor, inquiry control chip and motor in real time
The corresponding protective current Ipt of temperature t, judge whether compressor maximum starting current Isatmax is less than protective current Ipt, if
Compressor maximum starting current Isatmax is less than protective current Ipt, runs compressor；If compressor maximum starting current
Isatmax is more than protective current Ipt, into the compressor temperature rise period；
2) compressor is first set to Frequency operation, the temperature rising module being arranged on compressor by the compressor temperature rise period
Motor is heated, after protective current Ipt is made to be more than compressor maximum starting current Isatmax, runs compressor；
3) the compressor operating stage, for compressor after heating, control chip detects the motor temperature t of compressor in real time,
Then according to motor temperature t, inquiry control chip and motor temperature t corresponding protective current Ipt, protective current Ipt and pressure
Contracting machine running current Irun is compared；
If 4) compressor operating electric current Irun≤protective current Ipt, compressor is run, if compressor operating electric current
Irun >=protective current Ipt, control chip just stop compressor operating.
The value range of the Frequency is 20-30Hz；The frequency-changeable compressor is ferrite frequency-changeable compressor.
The guard method for preventing frequency-changeable compressor from demagnetizing, comprises the following steps：
1) compressor start stage, control chip detect the motor temperature t of compressor, inquiry control chip and motor in real time
The corresponding protective current Ipt of temperature t, judge whether compressor maximum starting current Isatmax is less than protective current Ipt, if
Compressor maximum starting current Isatmax is less than protective current Ipt, into the compressor operating stage；
2) compressor operating stage, control chip detect the motor temperature t of compressor in real time, then according to motor temperature t,
Inquiry control chip and motor temperature t corresponding protective current Ipt, protective current Ipt and compressor operating electric current Irun into
Row compares；
If 3) compressor operating electric current Irun≤protective current Ipt, compressor is run, if compressor operating electric current
Irun >=protective current Ipt, control chip just stop compressor operating.
The value range of the Frequency is 20-30Hz；Frequency-changeable compressor is rare earth frequency-changeable compressor.
The present invention is examined by setting the relation of the motor temperature t and protective current Ipt of frequency-changeable compressor using chip is controlled
Measured motor temperature t controls compressor maximum starting current Isatmax and compressor operating electric current Irun, realizes to frequency-changeable compressor
Anti-back magnet function is played, while expands its range of operation；The adding of temperature rising module can be realized plays heating to motor temperature t
Effect makes protective current Ipt be more than compressor maximum starting current Isatmax, improves the anti-demagnetization capability of compressor and expands magnetic
The application range of iron；It has the characteristics that simple and reasonable, service life is long, production of low cost and easy to process.
Description of the drawings
Fig. 1 is the control flow block diagram of one embodiment of the invention.
Fig. 2 is the current control curve schematic diagram of ferrite frequency-changeable compressor.
Fig. 3 is the current control curve schematic diagram of rare earth frequency-changeable compressor.
Fig. 4 is motor temperature t and protective current Ipt comparison tables.
Fig. 5 is the control flow block diagram of another embodiment.
Fig. 6 is the temperature curve schematic diagram of demagnetization current in ferrite frequency-changeable compressor.
Fig. 7 is the temperature curve schematic diagram of demagnetization current in rare earth frequency-changeable compressor.
In figure：A ferrite lattice demagnetization currents are that B is ferrite lattice protective current, and C is rare-earth magnet protective current,
D is rare-earth magnet demagnetization current.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
First embodiment
Referring to Fig. 1-Fig. 4, the guard method for originally preventing frequency-changeable compressor from demagnetizing, including the control being arranged on frequency-changeable compressor
Coremaking piece, the compressor are ferrite frequency-changeable compressor.The motor temperature t of chip detection compressor is controlled, control chip is set
Have and the corresponding protective current Ipt of motor temperature t.Usual protective current Ipt will consider minimum demagnetization current, still
If the value is too small, the performance of maximum cooling capacity is influenced whether.It is but if the value is too big, it is impossible to realize and frequency-changeable compressor is risen
To anti-back magnet function.For ferrite frequency-changeable compressor, demagnetization current when current protection setting value is less than -20 DEG C
Value, but the general running temperature of frequency-changeable compressor is 30-110 DEG C, and ferrite lattice demagnetization current in low temperature is smaller, during high temperature
Demagnetization current is much larger than demagnetization current during low temperature, and the small frequency-changeable compressor rotating speed that limits of current setting value influences maximum refrigeration
The performance of amount.Current setting value is less than the demagnetization current of 130 DEG C of maximum temperature, rare earth frequency conversion for rare earth frequency-changeable compressor
The demagnetization current of compressor at high temperature is smaller, and the demagnetization current under normal temperature is less than demagnetization current during high temperature.Electric current is protected
It is too small to protect setting value, limits the performance of frequency-changeable compressor compressor maximum cooling capacity.
According to frequency-changeable compressor demagnetization characteristic, frequency-changeable compressor temperature is set, 5 DEG C of setting is minimum quarter in the present embodiment
Degree is shown in that Fig. 2-Fig. 3, protective current Ipt will have certain surplus, and surplus can not be set too greatly, otherwise can reduce frequency conversion compression
The range of operation of machine, the surplus set in example is 3APK.After setting protective current Ipt, establish ferrite lattice temperature t and
Protective current Ipt comparison tables, are shown in Fig. 4.Data in table are stored in control chip, to realize by the way that chip is controlled to detect
Motor temperature t controls compressor maximum starting current Isatmax and compressor operating electric current Irun.
The guard method for preventing ferrite frequency-changeable compressor from demagnetizing, comprises the following steps：
1) the compressor start stage, frequency-changeable compressor, which starts, needs certain starting current, and starting current Istart is too small,
When being such as less than 2Apk, compressor start is easy to failure, and compressor start electric current Istart is too big, is such as higher than 10Apk, it is possible to
More than the demagnetization current of compressor, for particularly ferrite compressor in low temperature, demagnetization current is very low, required for compressor start
Maximum starting current Isatmax be easier that compressor is made to demagnetize.Control chip detects the motor temperature t of compressor in real time, looks into
Control chip and the corresponding protective current Ipt of motor temperature t are ask, judges whether compressor maximum starting current Isatmax is small
In protective current Ipt, if compressor maximum starting current Isatmax is less than protective current Ipt, compressor is run；If compressor
Maximum starting current Isatmax is more than protective current Ipt, into the compressor temperature rise period；
2) the compressor temperature rise period first runs compressor for Frequency, and the value range of the Frequency is 20-
30Hz.Temperature rising module is provided on compressor, the mode which is powered for external heating member or sharp compressor coil
The motor that compressor carries out is preheated, after protective current Ipt is made to be more than compressor maximum starting current Isatmax, Ran Houzai
Run compressor.Especially for 2HP and more than frequency-changeable compressor, since ferrite compressor operating Irun is comparatively close to
When the demagnetization current Im in low temperature of compressor, the load of compressor current and frequency rise too fast, compressor current can be made
The demagnetization current Im of compressor is can easily exceed, so first compressor is allowed to be run by Frequency, as the motor temperature t of compressor
When rising to certain value, then quick rising frequency, make compressor can with high load in the case of run.
3) the compressor operating stage, for compressor after heating, control chip detects the motor temperature t of compressor in real time,
Then according to motor temperature t, inquiry control chip and motor temperature t corresponding protective current Ipt, protective current Ipt and pressure
Contracting machine running current Irun is compared.It is detected in real time by the motor temperature t to compressor, constantly adjusts the guarantor of compressor
Electric current Ipt is protected, can effectively expand the range of operation of compressor, particularly ferrite frequency-changeable compressor, it can be by pressure
Contracting machine is preheated and is set temperature rising module, can also be reduced the resistance to demagnetization current characteristic that compressor uses magnet, be reduced into
This.
If 4) compressor operating electric current Irun≤protective current Ipt, compressor is run, if compressor operating electric current
Irun >=protective current Ipt, control chip just stop compressor operating.Ferrite is mainly used in the compression of below 2HP at present
On machine, this method can effectively make use of the ferrite lattice in high-power compressor, expand range of operation.
Second embodiment
Referring to Fig. 5, the compressor is rare earth frequency-changeable compressor, the guard method for preventing rare earth frequency-changeable compressor from demagnetizing,
Comprise the following steps：
1) compressor start stage, inquiry control chip and the corresponding protective current Ipt of motor temperature t, judge to compress
Whether machine maximum starting current Isatmax is less than protective current Ipt, if compressor maximum starting current Isatmax is more than protection
Electric current Ipt, control chip detect the motor temperature t of compressor in real time.If compressor maximum starting current Isatmax is less than protection
Electric current Ipt runs compressor.
2) the compressor operating stage, protective current Ipt is compared with compressor operating electric current Irun, if compressor is transported
Row electric current Irun≤protective current Ipt runs compressor, and control chip detects the motor temperature t of compressor in real time, then basis
Motor temperature t, inquiry control chip and the corresponding protective current Ipt of motor temperature t.If compressor operating electric current Irun >=
Protective current Ipt, control chip just stop compressor operating.Temperature rising module need not be added for rare earth frequency-changeable compressor, because
It is bigger for the startup demagnetization current Im of the lower compressor of temperature.During startup, if compressor temperature it is too high it is necessary to place one section when
Between, cooling compressor is allowed to restart afterwards for a period of time because the use environment scope of rare earth frequency-changeable compressor generally -20 DEG C -
50 DEG C, so by the starting current Isatmax of compressor protection electric current Ip50≤compressor maximum with regard to that can meet the requirements.It is other not
State the same first embodiment in part.
Claims (2)
1. a kind of guard method for preventing frequency-changeable compressor from demagnetizing, including the control chip being arranged on frequency-changeable compressor, control
Chip detects the motor temperature t of compressor, it is characterized in that the control chip is provided with and the corresponding protection electricity of motor temperature t
Ipt is flowed, according to frequency-changeable compressor demagnetization characteristic, frequency-changeable compressor temperature is set, sets 5 DEG C as minimum scale, protective current Ipt
Surplus for 3APK, the guard method comprises the following steps：
1) compressor start stage, control chip detect the motor temperature t of compressor, inquiry control chip and motor temperature in real time
The corresponding protective current Ipt of t, judge whether compressor maximum starting current Isatmax is less than protective current Ipt, if compression
Machine maximum starting current Isatmax is less than protective current Ipt, into the compressor operating stage；
2) compressor operating stage, control chip detect the motor temperature t of compressor in real time, then according to motor temperature t, inquiry
Chip is controlled to be compared with the corresponding protective current Ipt of motor temperature t, protective current Ipt with compressor operating electric current Irun
Compared with；
If 3) compressor operating electric current Irun≤protective current Ipt, compressor is run, if compressor operating electric current Irun >=
Protective current Ipt, control chip just stop compressor operating；
Wherein described frequency-changeable compressor is rare earth frequency-changeable compressor.
2. the guard method for preventing frequency-changeable compressor from demagnetizing according to claim 1, it is characterized in that low-frequency value range
For 20-30Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510021713.0A CN104617554B (en) | 2011-11-18 | 2012-01-05 | The guard method for preventing frequency-changeable compressor from demagnetizing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110370465 | 2011-11-18 | ||
| CN2011103704652 | 2011-11-18 | ||
| CN201210002737.8A CN103124064B (en) | 2011-11-18 | 2012-01-05 | Protection method for preventing frequency conversion compressor from demagnetization |
| CN201510021713.0A CN104617554B (en) | 2011-11-18 | 2012-01-05 | The guard method for preventing frequency-changeable compressor from demagnetizing |
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| CN201210002737.8A Division CN103124064B (en) | 2011-11-18 | 2012-01-05 | Protection method for preventing frequency conversion compressor from demagnetization |
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| CN104617554B true CN104617554B (en) | 2018-05-29 |
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| CN201210002737.8A Active CN103124064B (en) | 2011-11-18 | 2012-01-05 | Protection method for preventing frequency conversion compressor from demagnetization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103501147B (en) * | 2013-09-23 | 2016-04-06 | 广东美芝精密制造有限公司 | Prevent the method that compressor demagnetizes |
| CN104753188B (en) * | 2013-12-30 | 2018-01-23 | 丹佛斯（天津）有限公司 | The method of motor, compressor and controlled motor or compressor |
| CN105822535B (en) * | 2016-04-19 | 2018-06-29 | 广东美的制冷设备有限公司 | Control method, device and the air conditioner of compressor |
| CN105927524B (en) * | 2016-04-19 | 2017-07-28 | 广东美的制冷设备有限公司 | Control method, device and the air conditioner of compressor |
| CN106786438A (en) * | 2016-12-28 | 2017-05-31 | 广东美的制冷设备有限公司 | Current foldback circuit, motor and air-conditioner |
| CN106786440A (en) * | 2016-12-28 | 2017-05-31 | 广东美的制冷设备有限公司 | Current foldback circuit, motor and air-conditioner |
| CN106711978B (en) * | 2017-01-06 | 2019-07-30 | 广东美的制冷设备有限公司 | Current foldback circuit, method and the air conditioner of adjustable IPM module |
| CN108278749A (en) * | 2018-01-10 | 2018-07-13 | 广东美的制冷设备有限公司 | The demagnetization detection method of compressor, device in air conditioner and air conditioner |
| CN111780380A (en) * | 2020-06-15 | 2020-10-16 | 珠海格力电器股份有限公司 | Method and device for controlling running state of compressor |
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| CN101725533A (en) * | 2008-10-29 | 2010-06-09 | 乐金电子(天津)电器有限公司 | Method for starting compressor of air conditioner at low temperature |
| CN101814717A (en) * | 2010-04-01 | 2010-08-25 | 广东美的电器股份有限公司 | Compressor protection method for air conditioner |
| CN102255282B (en) * | 2011-07-18 | 2014-01-08 | 重庆长安汽车股份有限公司 | Temperature control method for permanent magnet synchronous motor and intelligent power unit system of pure electric vehicle |
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- 2012-01-05 CN CN201210002737.8A patent/CN103124064B/en active Active
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| CN1996743A (en) * | 2006-01-06 | 2007-07-11 | 三星电子株式会社 | Brushless DC motor control device and control method therefor |
| CN101680445A (en) * | 2007-06-06 | 2010-03-24 | 三电有限公司 | Electric compressor control device |
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| CN104617554A (en) | 2015-05-13 |
| CN103124064A (en) | 2013-05-29 |
| CN103124064B (en) | 2015-07-01 |
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