CN112112789B - Method and device for starting linear compressor and linear compressor - Google Patents
Method and device for starting linear compressor and linear compressor Download PDFInfo
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- CN112112789B CN112112789B CN201910533493.8A CN201910533493A CN112112789B CN 112112789 B CN112112789 B CN 112112789B CN 201910533493 A CN201910533493 A CN 201910533493A CN 112112789 B CN112112789 B CN 112112789B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
Abstract
The application relates to a method and a device for starting a linear compressor and the linear compressor, wherein the method comprises the following steps: and driving the linear compressor at the initial frequency to obtain the frequency of the linear compressor, and driving the linear compressor at the corrected initial frequency under the condition that the frequency of the linear compressor does not meet the resonance frequency condition. The method and the device for starting the linear compressor and the linear compressor can improve the probability of successfully starting the linear compressor.
Description
Technical Field
The present application relates to the field of compressor technology, and for example, to a method and an apparatus for starting a linear compressor, and a linear compressor.
Background
At present, the mainstream starting scheme in the market is center frequency starting, namely, the running frequency range (f) of the linear compressor under each working condition is presumed in advancemin～fmax) And taking the center frequency f of the frequency range0＝(fmax+fmin) And/2 is used as a starting frequency, and the starting is initially carried out in an open loop mode on the basis of the frequency.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the starting frequency of the linear compressor needs to be consistent with the resonant frequency of the linear compressor, the linear compressor can be started successfully, and the resonant frequency of the linear compressor is related to a plurality of factors such as working condition environment, internal friction and the like, so that the difference between the central frequency and the resonant frequency is large, and the starting failure is caused.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for starting a linear compressor and the linear compressor, so as to solve the technical problem that the linear compressor is easy to fail to start.
In some embodiments, the method comprises:
driving a linear compressor at an initial frequency to obtain a frequency of the linear compressor;
and driving the linear compressor at the corrected initial frequency under the condition that the frequency of the linear compressor does not meet the resonance frequency condition.
In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the aforementioned method for starting a linear compressor.
In some embodiments, the linear compressor comprises the aforementioned apparatus.
The method and the device for starting the linear compressor and the linear compressor provided by the embodiment of the disclosure can realize the following technical effects: under the condition that the initial frequency of the linear compressor is not matched with the resonant frequency of the linear compressor, the initial frequency is corrected, the linear compressor is driven at the corrected initial frequency until the initial frequency for driving the linear compressor is matched with the resonant frequency, and therefore the linear compressor is started successfully.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings, and which do not constitute a limitation on the embodiments, in which elements having the same reference number designation are shown as similar elements, and in which:
fig. 1 is a schematic flow diagram of a method for starting a linear compressor provided by an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart diagram of a method for starting a linear compressor provided by an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart diagram of a method for starting a linear compressor provided by an embodiment of the present disclosure;
FIG. 4 is a block schematic diagram of an apparatus for starting a linear compressor provided by an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a circuit configuration of an electric drive device provided by an embodiment of the present disclosure.
Reference numerals are as follows:
40: a processor; 41: a memory; 42: a communication interface; 43: a bus; 51: a linear motor.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The disclosed embodiments provide a method for starting a linear compressor.
Fig. 1 is a schematic flow diagram of a method for starting a linear compressor provided by an embodiment of the present disclosure, and in some embodiments, as shown in fig. 1, the method for starting a linear compressor includes:
and step S101, driving the linear compressor at the initial frequency to obtain the frequency of the linear compressor.
At the start of starting the linear compressor, the initial frequency is a preset frequency, and optionally, the initial frequency is a center frequency of the linear compressor, wherein the center frequency is a center frequency of a normal operation frequency range of the linear compressor. For example, the normal operation frequency range (f) of the linear compressor under each operating condition is estimated in advancemin～fmax) Then the center frequency f0＝(fmax+fmin)/2。
In the operation process of the linear compressor, a rotor of the linear motor part makes radial linear reciprocating motion relative to a stator, the rotor drives a piston to suck and compress in a radial reciprocating mode, and the effect of outputting different cooling capacities is achieved by controlling the stroke length of the reciprocating motion of the piston. In the exhaust motion of the piston, the farthest top point which can be reached is an exhaust top point; the farthest point reached by the piston in the suction movement is the suction point. In the present disclosure, the linear compressor is in the suction phase when the piston moves from the discharge apex to the suction apex; when the piston moves from the suction peak to the exhaust peak, the linear compressor is in the exhaust stage.
The module for driving the rotor to do linear reciprocating motion relative to the stator is an electric driving device.
In step S101, the linear compressor is driven at an initial frequency, i.e. the electric drive is controlled to supply electric energy to the linear compressor at the initial frequency. The frequency of the linear compressor refers to the frequency of the linear compressor, in which the mover makes a radial linear reciprocating motion relative to the stator during the actual operation process, or the frequency of the piston performing radial reciprocating suction and compression.
In some embodiments, when starting at the set frequency in step S101, it is ensured that the driving voltage applied to the linear motor in the linear compressor may be such that the stroke of the mover movement of the linear motor is equal to or greater than 20% of the maximum stroke of the mover movement. Under the condition that the stroke of the rotor is more than or equal to 20% of the maximum stroke, the counter electromotive force of the zero crossing point of the rotor is obvious, the zero crossing point can be obtained more accurately, the frequency of the linear compressor can be further obtained more accurately, whether the frequency of the linear compressor meets the resonance frequency condition or not can be conveniently and accurately judged, and the success rate of starting the linear compressor is increased.
And step S102, under the condition that the frequency of the linear compressor does not meet the resonance frequency condition, driving the linear compressor at the corrected initial frequency.
For the linear compressor which is started up, the rotor operates in a steady state model similar to a pendulum system, and the steady state model can be obtained according to the rotorMass M, resonant spring coefficient KmRefrigerant gas spring coefficient KgObtaining a mover frequency fz. Alternatively, the theoretical mover frequency f is obtained byz：
At a mover with a frequency fzUnder the condition of movement, the linear motor can realize stable operation. Wherein the mover resonates with a resonant spring, a refrigerant gas, etc., so that the frequency f of the mover is set to be higher than the frequency f of the resonant springzSo-called resonant frequency fz. That is, during the start-up of the linear compressor, the mover frequency needs to reach the resonance frequency fzThe linear compressor can be successfully started.
Under the condition that the actually obtained frequency of the linear compressor can not enable the mover to reach the resonance frequency, the linear compressor can be judged to be not started successfully at the moment. At this time, the initial frequency is corrected, and the linear compressor is driven at the corrected initial frequency until the initial frequency can make the mover reach a condition of a resonance frequency, thereby increasing the probability of successful start of the linear compressor.
In some embodiments, the driving the linear compressor at the corrected initial frequency in step S102 includes:
restarting the linear compressor to drive the linear compressor at the corrected initial frequency; or the like, or, alternatively,
the linear compressor is directly driven at the corrected initial frequency without restarting the linear compressor.
In some embodiments, the linear compressor is controlled to enter a frequency closed loop control mode in the event that the frequency of the linear compressor satisfies a resonant frequency condition. When the linear compressor enters a frequency closed-loop control mode, in which the mover of the linear compressor is at the resonance frequency f, meaning that the linear compressor has been successfully started, the frequency closed-loop control mode is usedzAnd (5) stable operation.
Resonant frequency fzIs greatly influenced by actual working conditions, and particularlyIn the environment of use, the resonant frequency of a linear compressor is often an unknown quantity.
In some embodiments, obtaining the frequency of the linear compressor in step S101 includes: the first frequency and the second frequency of the linear compressor are sequentially obtained. Alternatively, the resonance frequency condition in step S102 includes: the difference value between the first frequency and the second frequency meets a first preset condition and a second preset condition, wherein the first preset condition means that the change amplitude from the first frequency to the second frequency is smaller than or equal to a critical value, and the second preset condition means that the second frequency is smaller than the first frequency due to the friction damping motion. The flow of the method for starting up the linear compressor can be seen in fig. 2.
Fig. 2 is a schematic flow chart diagram of a method for starting a linear compressor provided by an embodiment of the present disclosure. As shown in fig. 2, the method for starting up the linear compressor includes:
step S201, driving the linear compressor with the initial frequency, and sequentially obtaining a first frequency and a second frequency of the linear compressor.
Wherein the first frequency and the second frequency are frequencies of the linear compressor in one or more operating cycles.
Step S202, obtaining a difference value between the first frequency and the second frequency, and controlling the linear compressor to enter a closed-loop control mode when the difference value meets a first preset condition and a second preset condition.
When the difference between the first frequency and the second frequency satisfies the first preset condition and the second preset condition, the second frequency may be determined as the resonant frequency of the linear compressor, and thus the linear compressor may be controlled to enter frequency closed-loop control.
The frequencies of the two linear compressors can be obtained by step S201: a first frequency and a second frequency. Wherein the initial frequency is a theoretical frequency, the first frequency is closer to the resonant frequency of the linear compressor than the initial frequency, the second frequency obtained by the friction damping motion is closer to the resonant frequency of the linear compressor than the first frequency, and the one frequency is closer to the resonant frequency of the linear compressor, which means that the difference between the one frequency and the resonant frequency is smaller. A driving frequency value close to the resonant frequency can be obtained through the steps S201 and S202; and if the frequency is not resonant, the difference between the obtained first frequency and the obtained second frequency does not accord with a second preset condition, and the linear compressor is driven by the corrected initial frequency.
In some embodiments, the first frequency is a first free-motion period frequency value obtained after 1/4 cycles of the linear compressor drive;
the second frequency is the second free-motion period frequency value obtained after 1/4 cycles of linear compressor drive. Correspondingly, the first preset condition refers to that after the linear press is subjected to 1/4 cycle driving, the variation amplitude from the first frequency to the second frequency is less than or equal to a critical value; the second predetermined condition means that the second frequency is less than the first frequency due to the frictionally damped motion.
In some embodiments, the first preset condition comprises: the difference value of the first frequency and the second frequency is within a set proportion range; the second preset condition includes: the second frequency is always close to the first frequency but always smaller than the first frequency.
The first preset condition and the second preset condition are not influenced by the absolute value of the resonant frequency of the linear compressor, so that the method for starting the linear compressor is suitable for linear compressors with various resonant frequencies, and the application range of the method for starting the linear compressor is widened.
In some embodiments, the range of ratios is set to 10% or less.
Before the linear compressor starts, the mover of the linear motor is in the equilibrium position, and after 1/4 cycles of driving the linear compressor at the initial frequency, the linear compressor starts to run freely. Under the condition that the first frequency is a first free motion period frequency value obtained after the linear compressor is started for 1/4 periods, and the second frequency is a second free motion period frequency value obtained after the linear compressor is started for 1/4 periods, the frequency of the linear compressor can be obtained only by 2.25 operation periods after the linear compressor is driven, so that the time of the linear compressor operating at the non-resonant frequency is shortened, the time of the linear compressor generating noise is shortened, and the noise pollution is reduced; the time of the linear compressor running at the non-resonant frequency is shortened, and the phenomenon of the non-resonant current surge is also reduced.
The controller, upon receiving a start-up command, the electric drive applies a driving voltage to a linear motor in the linear compressor. The linear compressor is started, the rotor of the linear compressor is static at a balance position, after the application of driving voltage is finished, the rotor or the piston starts to move freely, the rotor or the spring can do damping simple harmonic vibration due to the spring structure of the linear motor, and when the moving direction is reversed every time, zero-crossing phenomenon can occur to counter electromotive force generated by the movement of the rotor or the spring. The first frequency and the second frequency of the motion of the rotor or the piston can be obtained by capturing the zero crossing point, when the first frequency and the second frequency meet a first preset condition and a second preset condition, the current frequency of the linear compressor is judged to be the resonance frequency, and the linear compressor is controlled to enter a frequency closed-loop control mode to operate.
The set frequency for driving the linear compressor does not necessarily meet the resonance frequency condition, the embodiment reduces the application time of the improper driving frequency to the linear compressor, reduces the time for the linear compressor to generate noise, and reduces noise pollution; the time of the linear compressor running at the non-resonant frequency is shortened, and the phenomenon of the non-resonant current surge is also reduced.
After the linear compressor is driven, that is, after the linear motor in the linear compressor is driven, the mover of the linear motor reciprocates, and the linear motor may provide a varying back electromotive force.
Fig. 3 is a schematic flowchart of a method for starting a linear compressor according to an embodiment of the present disclosure, and as shown in fig. 3, in some embodiments, obtaining a frequency of the linear compressor in step S101 includes:
s301, collecting the back electromotive force of the linear compressor;
step S302, calculating the frequency of the linear compressor according to the time interval between the zero-crossing points of the back electromotive force.
The motion period of the mover can be obtained by detecting the change of the back electromotive force of the linear compressor, for example, the mover moves for one period every time the back electromotive force passes through a zero point twice, and then the motion frequency of the mover, that is, the frequency of the linear compressor can be determined.
In some embodiments, the first frequency is obtained by detecting back emf zero crossings of the linear compressor twice, and then the second frequency is obtained by detecting back emf zero crossings of the linear compressor twice.
Firstly, the mover or the piston of the linear compressor is controlled to start moving, the voltage applied by the electric driving device is used for ensuring that the moving stroke of the mover is more than 20% of the maximum stroke, and then the driving voltage is not applied any more, and the counter electromotive force of the linear compressor under the free movement is collected. Wherein, a first frequency is obtained through the continuously collected 1 st, 2 nd and 3 rd back electromotive force zero crossing points; and acquiring a second frequency through the acquired 3 rd, 4 th and 5 th back electromotive force zero-crossing points.
For example, after the linear compressor is powered on and driven, the linear compressor mover or piston starts to move, and the end point of the mover or piston in the direction of starting to move is taken as an a end point, and the other end point is taken as a B end point: when the mover or piston of the linear compressor reaches an end point A and reverses, the 1 st counter electromotive force zero crossing point is generated and is timed to be T1(ii) a When the mover or piston of the linear compressor moves freely to the other end point B in the reverse direction, the 2 nd counter electromotive force zero crossing point is generated and is timed to be T2(ii) a When the mover or the piston of the linear compressor freely moves to the end point A again and reverses, a 3 rd counter electromotive force zero crossing point is generated and timed to be T3(ii) a Then T3-T2Is a first frequency; the rotor or the piston continues to move freely to the end point B and reverses, generating the 4 th counter electromotive force zero crossing point and timing to be T4(ii) a The rotor or the piston continues to move freely to the A end point and reverses, the 5 th counter electromotive force zero crossing point is generated, and the timing is T5(ii) a Then T5-T4Is the second frequency.
The initial frequency corrected in step S102 is numerically different from the initial frequency in step S101.
In some embodiments, modifying the initial frequency comprises:
selecting the candidate frequencies in sequence from the ordered candidate frequencies as corrected initial frequencies;
wherein the candidate frequency is within a normal operating frequency range of the linear compressor.
For example, the normal operating frequency range of the linear compressor is fmin～fmaxThe candidate frequency is at fmin～fmaxTwo or more frequency values taken within the range. The candidate frequencies are ordered in a manner including any one of:
sorting the values of the candidate frequencies from large to small in an arithmetic progression mode;
sorting the values of the candidate frequencies from small to large in an arithmetic progression mode;
sorting according to the numerical value of the candidate frequency from large to small in a normal distribution mode;
sorting the candidate frequencies from small to large in a normal distribution mode according to the numerical values of the candidate frequencies.
In some embodiments, modifying the initial frequency comprises: adding a set frequency value on the basis of the original initial frequency to obtain a corrected initial frequency; or, subtracting the set frequency value on the basis of the original frequency to obtain the corrected initial frequency. The larger the set frequency value is, the more the number of frequency values in the frequency table is; the smaller the set frequency value, the smaller the number of frequency values in the frequency table. For example, the set frequency value may be 1Hz, and the original initial frequency is f0Corrected initial frequency f0+1 Hz. The disclosed embodiments provide an apparatus for starting a linear compressor.
Fig. 4 is a block schematic diagram of an apparatus for starting a linear compressor according to an embodiment of the present disclosure, and as shown in fig. 4, the apparatus for starting a linear compressor includes:
a processor (processor)40 and a memory (memory)41, and may further include a Communication Interface (Communication Interface)42 and a bus 43. The processor 40, the communication interface 42 and the memory 41 can communicate with each other through the bus 43. Communication interface 42 may be used for information transfer. The processor 40 may call logic instructions in the memory 41 to perform the method for starting the linear compressor of the above-described embodiment.
In addition, the logic instructions in the memory 41 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 41 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 40 executes the functional application and data processing by executing the software program, instructions and modules stored in the memory 41, that is, implements the method in the above-described method embodiment.
The memory 41 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 41 may include a high-speed random access memory, and may also include a nonvolatile memory.
The disclosed embodiment provides a linear compressor.
In some embodiments, the linear compressor comprises the above-described means for starting the linear compressor.
In some embodiments, the linear compressor further comprises a body portion and a linear motor portion. Wherein, the body part includes: the device comprises a shell, a cylinder cover, a piston, a spring, a rear spring baffle, a front flange and an oil pump; the linear motor section includes: stator, coil, internal stator, external stator, active cell, permanent magnet.
In some embodiments, the linear compressor further comprises an electric drive.
Fig. 5 is a schematic circuit structure diagram of an electric driving device provided in an embodiment of the present disclosure, and as shown in fig. 5, the electric driving device includes four insulated Gate Bipolar transistors igbt (insulated Gate Bipolar transistor), which are U1, U2, V1, and V2. U1 and U2 are connected in series on the power supply line, V1 and V2 are connected in series on the power supply line, one end of the linear motor 51 is connected to the connection point of U1 and U2, and the other end of the linear motor 51 is connected to the connection point of V1 and V2.
When the U1 and the V2 are conducted, the rotor of the linear motor runs towards one direction; when V1 and U2 are turned on, the mover of the linear motor is operated toward the other direction. Wherein, when the one direction is an air suction peak, the other direction is an air discharge peak; when the one direction is an exhaust vertex, the other direction is an intake vertex.
Optionally, the electric drive device includes a Power driving module IPM (intelligent Power module), and the Power driving module IPM is used for driving the linear motor to move.
Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for starting a linear compressor.
The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for starting a linear compressor.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments of the present disclosure includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (8)
1. A method for starting a linear compressor, characterized in that it comprises:
driving a linear compressor at an initial frequency to obtain a frequency of the linear compressor; wherein the obtaining of the frequency of the linear compressor comprises: sequentially obtaining a first frequency and a second frequency of the linear compressor; the first and second frequencies are frequencies of the linear compressor over more than one operating cycle;
driving the linear compressor at the corrected initial frequency in case that the frequency of the linear compressor does not satisfy the resonance frequency condition; wherein the resonance frequency conditions include: the frequency difference value of the first frequency and the second frequency meets a first preset condition and a second preset condition; the first preset condition means that the change amplitude from the first frequency to the second frequency is smaller than or equal to a critical value, and the second preset condition means that the second frequency is smaller than the first frequency due to the friction damping motion.
2. The method of claim 1,
the first frequency is a first free-motion period frequency value obtained after 1/4 driving cycles of the linear compressor and the second frequency is a second free-motion period frequency value obtained after 1/4 driving cycles of the linear compressor.
3. The method of claim 1, wherein said driving the linear compressor at an initial frequency comprises:
driving the linear compressor at a center frequency when starting the linear compressor;
wherein the center frequency is a center frequency of a normal operation frequency range of the linear compressor.
4. The method of claim 1, wherein the obtaining the frequency of the linear compressor comprises:
collecting back electromotive force of the linear compressor;
and calculating the frequency of the linear compressor according to the time interval between the zero-crossing points of the back electromotive force.
5. The method of claim 1, wherein said driving the linear compressor at the modified initial frequency comprises:
restarting the linear compressor;
driving the linear compressor at the corrected initial frequency.
6. The method of claim 1, wherein modifying the initial frequency comprises:
selecting candidate frequencies in order from the ordered candidate frequencies as the corrected initial frequencies;
wherein the candidate frequency is within a normal operating frequency range of the linear compressor.
7. An apparatus for starting a linear compressor comprising a processor and a memory storing program instructions, characterized in that the processor is configured to perform the method according to any one of claims 1 to 6 when executing the program instructions.
8. A linear compressor, characterized by comprising the device of claim 7.
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| JPH10122141A (en) * | 1996-10-18 | 1998-05-12 | Sanyo Electric Co Ltd | Driving device of linear compressor |
| CN1459921A (en) * | 2002-05-21 | 2003-12-03 | 松下电器产业株式会社 | Driving device for linear motor |
| CN106208890A (en) * | 2016-07-21 | 2016-12-07 | 瑞声科技(新加坡)有限公司 | Linear electric machine vibrates conforming compensation device and compensation method thereof |
| CN106996665A (en) * | 2017-03-22 | 2017-08-01 | 珠海格力电器股份有限公司 | Compressor start method, device and terminal |
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Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Patentee after: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Patentee after: Haier Zhijia Co., Ltd Address before: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Patentee before: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Patentee before: Haier Limited by Share Ltd, Qingdao |
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