A refrigerator compressor driving method and a variable frequency compressor and refrigerator

Abstract

This invention discloses a refrigerator compressor driving method, a variable frequency compressor, and a refrigerator. The method includes acquiring a compressor start command and the sequence of the compressor's previous energization phases, and then energizing the compressor stator according to the sequence of the compressor's previous energization phases to control the compressor rotor to start from the initial position. Since the energization of the compressor stator is based on the sequence of the compressor's previous energization phases, controlling the compressor start-up by changing the energization sequence of the compressor stator each time can reduce compressor coil carbonization, increase positioning current capability, improve compressor start-up performance, and extend the compressor's service life.

Description

Technical Field

[0001] The present invention relates to the field of refrigerator technology, and in particular to a refrigerator compressor driving method, a variable frequency compressor, and a refrigerator. Background Technology

[0002] Currently, most refrigerator inverter controllers use Field Oriented Control (FOC) algorithms. A core concept of the FOC algorithm is to decompose the magnetic field applied to the motor into the D-axis (excitation) and Q-axis (torque). By adjusting the D-axis, the excitation is changed, and by adjusting the Q-axis, the torque is changed. This allows for the regulation of the excitation and torque in a three-phase permanent magnet synchronous motor (PMSM) similar to driving a conventional DC motor. However, current PMSMs are energized using a fixed phase, which can cause carbonization of the compressor coils and reduce the compressor's lifespan. Summary of the Invention

[0003] This invention provides a refrigerator compressor driving method, a variable frequency compressor, and a refrigerator, which reduces compressor coil carbonization, improves compressor starting performance, and extends compressor service life.

[0004] In a first aspect, embodiments of the present invention provide a refrigerator compressor driving method, comprising:

[0005] Obtain the compressor start command and the sequence of the last energized phase of the compressor;

[0006] According to the sequence of the last energization phase of the compressor, the stator of the compressor is energized, and the rotor of the compressor is controlled to start from the initial position.

[0007] Optionally, the energizing phase includes a first phase, a second phase, and a third phase;

[0008] The step of energizing the stator of the compressor according to the sequence of the previous energization phase includes:

[0009] When the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor with the second energization sequence;

[0010] When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor in the third energization sequence;

[0011] When the previous energization phase sequence of the compressor was the third energization sequence, the three-phase bridge controlling the compressor with the first energization sequence energizes the stator of the compressor.

[0012] The first power-on sequence is the first phase, the second phase, and the third phase; the second power-on sequence is the second phase, the third phase, and the first phase; and the third power-on sequence is the third phase, the first phase, and the second phase.

[0013] Optionally, the initial position of the rotor is determined according to the following steps:

[0014] Obtain the compressor's previous startup load;

[0015] The initial position of the rotor is determined based on the previous start-up load of the compressor and the correspondence between the load and the initial position of the rotor.

[0016] In a second aspect, embodiments of the present invention provide a variable frequency compressor, comprising:

[0017] The stator is used to provide an alternating magnetic field;

[0018] The rotor is used to drive the connecting rod to move under the action of an alternating magnetic field;

[0019] A power supply for powering the compressor;

[0020] A frequency converter is used to control the operation of the compressor;

[0021] The frequency converter is specifically used to acquire the compressor start command and the sequence of the compressor's previous energization phases; according to the sequence of the compressor's previous energization phases, it energizes the compressor's stator and controls the compressor's rotor to start from the initial position.

[0022] Optionally, the energizing phase includes a first phase, a second phase, and a third phase;

[0023] The frequency converter is specifically used for:

[0024] When the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor with the second energization sequence;

[0025] When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor in the third energization sequence;

[0026] When the previous energization phase sequence of the compressor was the third energization sequence, the three-phase bridge controlling the compressor with the first energization sequence energizes the stator of the compressor.

[0027] The first power-on sequence is the first phase, the second phase, and the third phase; the second power-on sequence is the second phase, the third phase, and the first phase; and the third power-on sequence is the third phase, the first phase, and the second phase.

[0028] Optionally, the frequency converter is specifically used for:

[0029] The initial position of the rotor is determined according to the following steps:

[0030] Obtain the compressor's previous startup load;

[0031] The initial position of the rotor is determined based on the previous start-up load of the compressor and the correspondence between the load and the initial position of the rotor.

[0032] Thirdly, embodiments of the present invention provide a refrigerator, including the inverter compressor described in the second aspect.

[0033] Fourthly, embodiments of the present invention also provide a computing device, comprising:

[0034] Memory, used to store program instructions;

[0035] The processor is configured to invoke program instructions stored in the memory and execute the method described in the first aspect according to the obtained program.

[0036] Fifthly, embodiments of the present invention also provide a computer-readable non-volatile storage medium, including computer-readable instructions, which, when read and executed by a computer, cause the computer to perform the method described in the first aspect.

[0037] This invention demonstrates that by acquiring the compressor start-up command and the sequence of the compressor's previous energization phases, and then energizing the compressor stator according to the sequence of the previous energization phases, the compressor rotor is controlled to start from the initial position. Since the energization of the compressor stator is based on the sequence of the compressor's previous energization phases, controlling the compressor start-up by changing the energization sequence of the compressor stator each time can reduce compressor coil carbonization, increase positioning current capability, improve compressor start-up performance, and extend compressor lifespan. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the framework structure of an FOC algorithm provided in an embodiment of the present invention;

[0040] Figure 2 A schematic flowchart of a refrigerator compressor driving method provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a variable frequency compressor provided in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0043] Figure 1 An exemplary framework of an FOC algorithm applicable to an embodiment of the present invention is shown. Based on this framework, the refrigerator inverter controller can obtain the three-phase currents Ia, Ib, and Ic flowing through the PMSM motor through the sampling resistor R. After Clarke transformation, Iα and Iβ are obtained, and then after Park transformation, they are converted into Iq and Id. On the other hand, based on Iα and Iβ, the actual speed ω is estimated by an estimator and compared with the set speed. After PI regulation, reference currents Iq and Id are output. After PI regulation through the current loop, the actual Vq and Vd are output. Finally, after inverse Clarke and inverse Park transformations and SVM modulation, the three-phase electricity is obtained and the motor is driven through a three-phase bridge.

[0044] Based on the above description Figure 2 The present invention provides a detailed flowchart of a refrigerator compressor driving method according to an embodiment of the invention, which can be executed by a frequency converter.

[0045] like Figure 2 As shown, the process specifically includes:

[0046] Step 201: Obtain the compressor start command and the sequence of the last energized phase of the compressor.

[0047] After receiving the compressor start command, the compressor can be started by controlling the frequency converter. The energizing phases can include a first phase, a second phase, and a third phase. The order of the energizing phases can include a first order, a second order, and a third order. Specifically, the first energizing order can be the first phase, the second phase, and the third phase; the second energizing order can be the second phase, the third phase, and the first phase; and the third energizing order can be the third phase, the first phase, and the second phase.

[0048] It should be noted that the order of the energizing phases in the embodiments of the present invention is only for illustrative purposes, and can be set according to requirements in specific implementation.

[0049] Step 202: According to the sequence of the last energization phase of the compressor, energize the stator of the compressor to control the rotor of the compressor to start from the initial position.

[0050] Specifically, when the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge controlling the compressor with the second energization sequence energizes the compressor stator.

[0051] When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge controlling the compressor with the third energization sequence energizes the compressor stator.

[0052] When the compressor was previously energized in the third energizing sequence, the three-phase bridge that controls the compressor in the first energizing sequence energizes the compressor stator.

[0053] For example, the three-phase potentials are U, V, and W, with U, V, and W being the initial phases energized. That is, the first energization is U, V, and W; the second is V, W, and U; the third is W, U, and V; and the fourth is U, V, and W, with the three phases energized in a cyclical manner.

[0054] This invention demonstrates that by acquiring the compressor start-up command and the sequence of the compressor's previous energization phases, and then energizing the compressor stator according to the sequence of the previous energization phases, the compressor rotor is controlled to start from the initial position. Since the energization of the compressor stator is based on the sequence of the compressor's previous energization phases, controlling the compressor start-up by changing the energization sequence of the compressor stator each time can reduce compressor coil carbonization, increase positioning current capability, improve compressor start-up performance, and extend compressor lifespan.

[0055] Based on the same technological concept Figure 3 An exemplary embodiment of the present invention provides the structure of a variable frequency compressor that can perform the process of driving a refrigerator compressor.

[0056] like Figure 3 As shown, the variable frequency compressor specifically includes:

[0057] Stator 301 is used to provide an alternating magnetic field;

[0058] Rotor 302 is used to drive the connecting rod to move under the action of an alternating magnetic field;

[0059] Power supply 303 is used to supply power to the compressor;

[0060] The frequency converter 304 is used to control the operation of the compressor;

[0061] The frequency converter 304 is specifically used to acquire the compressor start command and the sequence of the compressor's previous energization phases; according to the sequence of the compressor's previous energization phases, it energizes the compressor's stator and controls the compressor's rotor to start from the initial position.

[0062] Optionally, the energizing phase includes a first phase, a second phase, and a third phase;

[0063] The frequency converter 304 is specifically used for:

[0064] When the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor with the second energization sequence;

[0065] When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor in the third energization sequence;

[0066] When the previous energization phase sequence of the compressor was the third energization sequence, the three-phase bridge controlling the compressor with the first energization sequence energizes the stator of the compressor.

[0067] The first power-on sequence is the first phase, the second phase, and the third phase; the second power-on sequence is the second phase, the third phase, and the first phase; and the third power-on sequence is the third phase, the first phase, and the second phase.

[0068] Optionally, the frequency converter 304 is specifically used for:

[0069] The initial position of the rotor is determined according to the following steps:

[0070] Obtain the compressor's previous startup load;

[0071] The initial position of the rotor is determined based on the previous start-up load of the compressor and the correspondence between the load and the initial position of the rotor.

[0072] Thirdly, embodiments of the present invention provide a refrigerator, including the aforementioned variable frequency compressor.

[0073] Based on the same technical concept, embodiments of the present invention also provide a computing device, including:

[0074] Memory, used to store program instructions;

[0075] The processor is used to call program instructions stored in memory and execute the above-mentioned refrigerator compressor driving method according to the obtained program.

[0076] Based on the same technical concept, embodiments of the present invention also provide a computer-readable non-volatile storage medium, including computer-readable instructions, which, when read and executed by a computer, cause the computer to execute the above-described refrigerator compressor driving method.

[0077] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0079] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0080] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0081] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A refrigerator compressor driving method, characterized in that, include: Obtain the compressor start command and the sequence of the last energized phase of the compressor; According to the sequence of the last energization phase of the compressor, the stator of the compressor is energized to control the rotor of the compressor to start from the initial position; The energizing phase includes a first phase, a second phase, and a third phase; The step of energizing the stator of the compressor according to the sequence of the previous energization phase includes: When the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor with the second energization sequence; When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor in the third energization sequence; When the previous energization phase sequence of the compressor was the third energization sequence, the three-phase bridge controlling the compressor with the first energization sequence energizes the stator of the compressor. The first power-on sequence is the first phase, the second phase, and the third phase; the second power-on sequence is the second phase, the third phase, and the first phase; and the third power-on sequence is the third phase, the first phase, and the second phase.

2. The method as described in claim 1, characterized in that, The initial position of the rotor is determined according to the following steps: Obtain the compressor's previous startup load; The initial position of the rotor is determined based on the previous start-up load of the compressor and the correspondence between the load and the initial position of the rotor.

3. A variable frequency compressor, characterized in that, include: The stator is used to provide an alternating magnetic field; The rotor is used to drive the connecting rod to move under the action of an alternating magnetic field; A power supply for powering the compressor; A frequency converter is used to control the operation of the compressor; The frequency converter is specifically used to acquire the compressor start command and the sequence of the compressor's previous energization phases; according to the sequence of the compressor's previous energization phases, it energizes the compressor's stator and controls the compressor's rotor to start from the initial position; The energizing phase includes a first phase, a second phase, and a third phase; The frequency converter is specifically used for: When the previous energization sequence of the compressor was the first energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor with the second energization sequence; When the previous energization sequence of the compressor was the second energization sequence, the three-phase bridge of the compressor is controlled to energize the stator of the compressor in the third energization sequence; When the previous energization phase sequence of the compressor was the third energization sequence, the three-phase bridge controlling the compressor with the first energization sequence energizes the stator of the compressor. The first power-on sequence is the first phase, the second phase, and the third phase; the second power-on sequence is the second phase, the third phase, and the first phase; and the third power-on sequence is the third phase, the first phase, and the second phase.

4. The variable frequency compressor as described in claim 3, characterized in that, The frequency converter is specifically used for: The initial position of the rotor is determined according to the following steps: Obtain the compressor's previous startup load; The initial position of the rotor is determined based on the previous start-up load of the compressor and the correspondence between the load and the initial position of the rotor.

5. A refrigerator, characterized in that, Including the variable frequency compressor as described in any one of claims 3 to 4.

6. A computing device, characterized in that, include: Memory, used to store program instructions; A processor is configured to invoke program instructions stored in the memory and execute the method according to any one of claims 1 to 2 in accordance with the obtained program.

7. A computer-readable non-volatile storage medium, characterized in that, It includes computer-readable instructions that, when read and executed by a computer, cause the computer to perform the method as described in any one of claims 1 to 2.

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