CN112112789B - Method and device for starting linear compressor and linear compressor - Google Patents

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

A method, device and linear compressor for starting a linear compressor

technical field

The present application relates to the technical field of compressors, for example, to a method, a device and a linear compressor for starting a linear compressor.

Background technique

At present, the mainstream start-up scheme on the market is the center frequency start, that is, the operating frequency range (f _min ~ f _max ) of the linear compressor under each operating condition is pre-estimated, and the center frequency of the frequency range f ₀ =(f _max +f _min is taken as )/2 as the starting frequency, and the open-loop starting is based on this frequency at the beginning of the start.

In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art: the starting frequency of the linear compressor needs to be consistent with its resonant frequency, so that the linear compressor can be successfully started, and the resonant frequency of the linear compressor is related to the working condition environment, Many factors, such as internal friction, cause the above center frequency to be quite different from the resonance frequency, resulting in failure to start.

SUMMARY OF THE INVENTION

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor to identify key/critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a method, a device, and a linear compressor for starting a linear compressor, so as to solve the technical problem that the linear compressor easily fails to start.

In some embodiments, the method includes:

driving the linear compressor at the initial frequency, obtaining the frequency of the linear compressor;

When the frequency of the linear compressor does not satisfy the resonance frequency condition, the linear compressor is driven at the corrected initial frequency.

In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the aforementioned method for activating a linear compressor.

In some embodiments, the linear compressor includes the aforementioned apparatus.

The method, device, and linear compressor for starting a linear compressor provided by the embodiments of the present disclosure can achieve the following technical effects: in the case that it is determined that the initial frequency of the linear compressor does not match its resonance frequency, the initial frequency is corrected, and then the initial frequency is corrected. The linear compressor is driven at the corrected initial frequency until the initial frequency of the driving linear compressor is adapted to the resonant frequency, thereby successfully starting the linear compressor.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the accompanying drawings, which do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings do not constitute a limitation of scale, and in which:

1 is a schematic flowchart of a method for starting a linear compressor provided by an embodiment of the present disclosure;

2 is a schematic flowchart of a method for starting a linear compressor provided by an embodiment of the present disclosure;

3 is a schematic flowchart of a method for starting a linear compressor provided by an embodiment of the present disclosure;

4 is a schematic block 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 structure of an electric drive device provided by an embodiment of the present disclosure.

Reference number:

40: processor; 41: memory; 42: communication interface; 43: bus; 51: linear motor.

Detailed ways

In order to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous details are provided 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 simplified in order to simplify the drawings.

Embodiments of the present disclosure provide a method for starting a linear compressor.

1 is a schematic flowchart of a method for starting a linear compressor provided by an embodiment of the present disclosure. In some embodiments, as shown in FIG. 1 , the method for starting a linear compressor includes:

Step S101 , drive the linear compressor at the initial frequency to obtain the frequency of the linear compressor.

When starting the linear compressor, the initial frequency is a preset frequency, optionally, the initial frequency is the center frequency of the linear compressor, wherein the center frequency is the center frequency of the normal operating frequency range of the linear compressor. For example, if the normal operating frequency range (f _min ˜f _max ) of the linear compressor under various operating conditions is predicted in advance, the center frequency f ₀ =(f _max +f _min )/2.

During the operation of the linear compressor, the mover of the linear motor part reciprocates radially and linearly with respect to the stator, and the mover drives the piston to reciprocate radially to inhale and compress, and to achieve different outputs by controlling the stroke length of the reciprocating motion of the piston cooling effect. In the exhaust movement, the farthest vertex that the piston can reach is the exhaust vertex; in the inspiratory movement, the farthest vertex that the piston can reach is the suction vertex. In the present disclosure, when the piston moves from the discharge vertex to the suction vertex, the linear compressor is in the suction phase; when the piston moves from the suction vertex to the discharge vertex, the linear compressor is in the discharge phase.

Among them, the module that drives the mover to perform linear reciprocating motion relative to the stator is an electric drive device.

In step S101, the linear compressor is driven at the initial frequency, that is, the electric drive device is controlled to provide the linear compressor with electric energy whose frequency is the initial frequency. The frequency of the above linear compressor refers to the frequency of the mover performing radial linear reciprocating motion relative to the stator during the actual operation of the linear compressor, or the frequency of the piston reciprocating suction and compression in the radial direction.

In some embodiments, when starting at the set frequency in step S101, it should be ensured that the driving voltage applied to the linear motor in the linear compressor can make the movement stroke of the mover of the linear motor greater than or equal to the maximum movable movement of the mover. 20% of the trip. When the stroke of the mover is greater than or equal to 20% of the maximum stroke, the back EMF of the zero-crossing point of the mover is more obvious, the zero-crossing point can be obtained more accurately, and the frequency of the linear compressor can be obtained more accurately, which is convenient for more accurate It can accurately judge whether the frequency of the linear compressor meets the resonance frequency condition, which increases the success rate of starting the linear compressor.

Step S102 , when the frequency of the linear compressor does not satisfy the resonance frequency condition, drive the linear compressor with the corrected initial frequency.

For the linear compressor that has been started, the steady state model of its mover operation is similar to that of the pendulum system, and the mover frequency f _z can be obtained according to the mover mass M, the resonance spring coefficient K _m , and the refrigerant gas spring coefficient K _g . Optionally, the theoretical mover frequency f _z is obtained by:

In the case where the mover moves at the frequency f _z , the linear motor can achieve stable operation. Among them, the mover realizes resonance with the resonant spring, refrigerant gas, etc., therefore, the above-mentioned mover frequency f _z may be referred to as the resonance frequency f _z . That is, during the starting process of the linear compressor, the mover frequency needs to reach the resonance frequency f _z , so that the linear compressor can be started successfully.

If the actually obtained frequency of the linear compressor cannot make the mover reach the condition of the resonance frequency, it can be determined that the linear compressor cannot be successfully started at this time. At this time, the initial frequency is corrected, and the linear compressor is driven at the corrected initial frequency until the initial frequency enables the mover to reach the condition of the resonance frequency, thereby increasing the probability of the linear compressor being successfully started.

In some embodiments, driving the linear compressor with the corrected initial frequency in step S102 includes:

Restart the linear compressor to drive the linear compressor at the corrected initial frequency; or,

Without restarting the linear compressor, directly drive the linear compressor with the corrected initial frequency.

In some embodiments, when the frequency of the linear compressor satisfies the resonance frequency condition, the linear compressor is controlled to enter a frequency closed-loop control mode. When the linear compressor enters the frequency closed-loop control mode, it means that the linear compressor has been successfully started. In the frequency closed-loop control mode, the mover of the linear compressor runs stably at the resonance frequency _fz .

The resonance frequency f _z is greatly affected by the actual working conditions. In a specific application environment, the resonance frequency of the linear compressor is often unknown.

In some embodiments, obtaining the frequency of the linear compressor in step S101 includes: sequentially obtaining the first frequency and the second frequency of the linear compressor. Optionally, the resonance frequency condition in step S102 includes: the difference between the first frequency and the second frequency satisfies the first preset condition and the second preset condition, wherein the first preset condition refers to the first frequency to the second The variation range of the frequency is less than or equal to the critical value, and the second preset condition means that the movement of the second frequency due to friction damping is smaller than the first frequency. The flow of the method for starting the linear compressor can be seen in FIG. 2 .

FIG. 2 is a schematic flowchart of a method for starting a linear compressor provided by an embodiment of the present disclosure. As shown in Figure 2, a method for starting a linear compressor includes:

Step S201 , drive the linear compressor at the initial frequency, and obtain the first frequency and the second frequency of the linear compressor in sequence.

Wherein, the first frequency and the second frequency are the frequencies of the linear compressor in one or more operating cycles.

Step S202: Obtain the difference between the first frequency and the second frequency, and when the difference satisfies the first preset condition and the second preset condition, control the linear compressor to enter the closed-loop control mode.

When the difference between the first frequency and the second frequency satisfies the first preset condition and the second preset condition, it can be determined that the second frequency is the resonance frequency of the linear compressor, and the linear compressor is thus controlled to enter frequency closed-loop control.

The frequencies of two linear compressors can be obtained through step S201: a first frequency and a second frequency. Among them, the initial frequency is the theoretical frequency, the first frequency is closer to the resonance frequency of the linear compressor than the initial frequency, the second frequency obtained by the friction damping motion is closer to the resonance frequency of the linear compressor than the first frequency, and the above-mentioned first frequency is closer to the resonance frequency of the linear compressor than the first frequency. Approaching the resonant frequency of the linear compressor means that the difference between the frequency and the resonant frequency is smaller. Through steps S201 and S202, a driving frequency value that is closer to the resonance frequency can be obtained; if it is not resonance, the difference between the obtained first frequency and the second frequency does not meet the second preset condition, and the corrected initial frequency is used at this time. Frequency drives linear compressors.

In some embodiments, the first frequency is the first free motion period frequency value obtained after the linear compressor is driven for 1/4 cycle;

The second frequency is the second free motion cycle frequency value obtained after the linear compressor drives 1/4 cycle. Correspondingly, the first preset condition means that after the linear press performs 1/4 cycle driving, the variation range from the first frequency to the second frequency is less than or equal to the critical value; the second preset condition means that the second frequency moves due to friction damping. less than the first frequency.

In some embodiments, the first preset condition includes: the difference between the first frequency and the second frequency is within a set ratio range; the second preset condition includes: the second frequency is always close to the first frequency but always smaller than the first frequency a frequency.

Different linear compressors have different resonance frequencies, and the above-mentioned first preset condition and second preset condition are not affected by the absolute value of the resonance frequency of the linear compressor, so that the method for starting the linear compressor is suitable for The availability of linear compressors with multiple resonance frequencies increases the applicable range of the method for starting the linear compressor.

In some embodiments, the set ratio range is less than or equal to 10%.

Before the linear compressor starts, the mover of the linear motor is in the equilibrium position, and after driving the linear compressor 1/4 cycle at the initial frequency, the linear compressor starts to run freely. The first frequency is the first free motion cycle frequency value obtained after the linear compressor starts 1/4 cycle, and the second frequency is the second free motion cycle frequency value obtained after the linear compressor starts 1/4 cycle. In this case, after driving the linear compressor, the frequency of the linear compressor can be obtained in only 2.25 operating cycles, which shortens the time that the linear compressor operates at the non-resonant frequency, and reduces the time that the linear compressor emits noise. Reduced noise pollution; shortened the time that the linear compressor operates at the non-resonant frequency, and also reduced the phenomenon of non-resonant current surges.

After the controller receives the start-up command, the electric drive device applies a drive voltage to the linear motor in the linear compressor. At the beginning of startup, the mover of the linear compressor is still at the equilibrium position. After the driving voltage is applied, the mover or the piston will start to move freely. Due to the spring structure of the linear motor, the mover or spring will do damped simple harmonic vibration, and in each When the direction of the secondary motion is reversed, the back EMF generated by the motion will cross zero. By capturing the zero-crossing point, the first frequency and the second frequency of the movement of the mover or the piston can be obtained. When the first frequency and the second frequency satisfy the first preset condition and the second preset condition, it is determined that the current linear compressor frequency is Resonance frequency, control the linear compressor to enter the frequency closed-loop control mode to run.

The set frequency for driving the linear compressor does not necessarily meet the resonant frequency condition. This embodiment reduces the application time of the improper driving frequency to the linear compressor, reduces the time for the linear compressor to emit noise, reduces noise pollution, and shortens the linear compression. The time the machine runs at the non-resonant frequency also reduces the phenomenon of non-resonant current surges.

After driving the linear compressor, ie, driving the linear motor in the linear compressor, 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 provided by an embodiment of the present disclosure. As shown in FIG. 3 , in some embodiments, obtaining the frequency of the linear compressor in step S101 includes:

Step S301, collecting the back electromotive force of the linear compressor;

Step S302: Calculate the frequency of the linear compressor through the time interval between the zero-crossing points of the back electromotive force.

By detecting the change of the back electromotive force of the linear compressor, the movement period of the mover can be obtained. For example, every time the back electromotive force crosses the zero point twice, the mover moves for one cycle, and then the movement frequency of the mover can be determined, that is, the linear compression machine frequency.

In some embodiments, the first frequency is obtained by detecting the zero-crossing points of the back electromotive force of the linear compressor twice, and then the second frequency is obtained by detecting the zero-crossing points of the back electromotive force of the linear compressor twice.

First, the mover or piston of the linear compressor is controlled to start moving, and the voltage applied by the electric drive device should ensure that the moving stroke of the mover is greater than 20% of the maximum stroke. Counter electromotive force. Among them, the first frequency is obtained through the zero-crossing points of the 1st, 2nd, and 3rd times of back-EMF collected continuously; the second frequency is obtained through the zero-cross points of the 3rd, 4th, and 5th times of back-EMF collected.

For example, after the linear compressor is energized and driven, the linear compressor mover or piston starts to move, and the end point in the direction of the mover or piston starts to move as the end point A, and the other end point is the B end point: when the mover or piston of the linear compressor starts to move When reaching the reverse of one end point A, the first counter-EMF zero-crossing point is generated, and the timing is T ₁ ; when the mover or piston of the linear compressor moves freely to the other end-point B, the second counter-EMF zero-crossing point is generated, and the timing is is T ₂ ; when the mover or piston of the linear compressor moves freely to the reverse of the A terminal, the third back EMF zero-crossing point is generated, and the timing is T ₃ ; then T ₃ -T ₂ is the first frequency; the mover or The piston continues to move freely to the reverse of the B terminal, and the 4th back EMF zero-crossing point is generated, and the timing is T ₄ ; the mover or the piston continues to freely move to the A terminal reverse, and the fifth counter-EMF zero-crossing point is generated, and the timing is T ₅ ; then T ₅ -T ₄ are the second frequencies.

The initial frequency corrected in step S102 is numerically different from the initial frequency in step S101.

In some embodiments, correcting the initial frequency includes:

Among the sorted candidate frequencies, select the candidate frequencies in order as the modified initial frequencies;

Among them, the candidate frequency is within the normal operating frequency range of the linear compressor.

For example, the normal operating frequency range of the linear compressor is f _min to f _max , and the candidate frequencies are two or more frequency values within the range of f _min to f _max . Candidate frequencies can be sorted in any of the following ways:

Sort the candidate frequencies in descending order in the form of arithmetic progression;

Sort the candidate frequencies in ascending order in the form of arithmetic progression;

Sort by the value of the candidate frequency from large to small in the form of a normal distribution;

Sort by the value of candidate frequencies in ascending order of normal distribution.

In some embodiments, correcting the initial frequency includes: adding a set frequency value on the basis of the original initial frequency to obtain a modified initial frequency; or, subtracting the set frequency value from the original frequency to obtain a modified initial frequency the initial frequency. Wherein, the larger the set frequency value, the more frequency values in the frequency table; the smaller the set frequency value, the less the number of frequency values in the frequency table. For example, the set frequency value can be 1Hz, the original initial frequency is f ₀ , and the corrected initial frequency is f ₀ +1Hz. Embodiments of the present disclosure provide an apparatus for starting a linear compressor.

4 is a schematic block diagram of an apparatus for starting a linear compressor provided by an embodiment of the present disclosure. As shown in FIG. 4 , the apparatus for starting a linear compressor includes:

A processor (processor) 40 and a memory (memory) 41 may also 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 . The communication interface 42 may be used for information transfer. The processor 40 may invoke logic instructions in the memory 41 to execute the method for starting a linear compressor of the above-described embodiments.

In addition, the above-mentioned logic instructions in the memory 41 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

As a computer-readable storage medium, the memory 41 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 40 executes functional applications and data processing by running the software programs, instructions, and modules stored in the memory 41, ie, implements the methods in the above method embodiments.

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. In addition, the memory 41 may include high-speed random access memory, and may also include non-volatile memory.

Embodiments of the present disclosure provide a linear compressor.

In some embodiments, the linear compressor includes the above-described means for activating the linear compressor.

In some embodiments, the linear compressor further includes a body portion and a linear motor portion. Among them, the body part includes: shell, cylinder, cylinder head, piston, spring, rear spring baffle, front flange and oil pump; the linear motor part includes: stator, coil, inner stator, outer stator, mover, permanent magnet.

In some embodiments, the linear compressor further includes an electric drive.

5 is a schematic diagram of a circuit structure of an electric drive device provided by an embodiment of the present disclosure. As shown in FIG. 5 , the electric drive device includes four IGBTs (Insulated Gate Bipolar Transistors), 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 U1 and V2 are turned on, the mover of the linear motor runs in one direction; when V1 and U2 are turned on, the mover of the linear motor runs in the other direction. Wherein, when the above-mentioned one direction is an intake apex, the above-mentioned other direction is an exhaust apex; and when the above-mentioned one direction is an exhaust apex, the above-mentioned other direction is an intake apex.

Optionally, the electric drive device includes a power drive module IPM (Intelligent Power Module), and the power drive module IPM is used to drive the linear motor to move.

Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, where the computer-executable instructions are configured to execute the above-mentioned method for starting a linear compressor.

An embodiment of the present disclosure provides a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is caused to execute the above-mentioned method for starting linear compressor method.

The above-mentioned computer-readable storage medium may be a transient computer-readable storage medium, and may also be a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present disclosure may be embodied in the form of software products, and the computer software products are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk, etc. A medium that can store program code can also be a transitory storage medium.

The foregoing description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of the disclosed embodiments includes the full scope of the claims, along with all available equivalents of the claims. When 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, without changing the meaning of the description, a first element could be termed a second element, and similarly, a second element could be termed a first element, so long as all occurrences of "the first element" were consistently renamed and all occurrences of "the first element" were named consistently The "second element" can be renamed consistently. The first element and the second element are both elements, but may not be the same element. Also, the terms used in this application are used to describe the embodiments only and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a" (a), "an" (an) and "the" (the) are intended to include the plural forms as well, unless the context clearly dictates otherwise. . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listings. Additionally, as used in this application, the term "comprise" and its variations "comprises" and/or including (comprising), etc., refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, reference may be made to the description of the method section for relevant parts.

Those skilled in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. Skilled artisans may use different methods for implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the disclosed embodiments. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units can refer to the corresponding processes in the foregoing method embodiments, and details are not repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to apparatuses, devices, etc.) may be implemented in other ways. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined Either it can be integrated into another system, or some features can be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. This embodiment may be implemented by selecting some or all of the units according to actual needs. In addition, each functional unit in the embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be 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 that includes one or more functions for implementing the specified logical function(s) executable instructions. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks 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 in special purpose hardware-based systems that perform the specified functions or actions, or special purpose hardware implemented in combination with 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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