Compressor control method and refrigerator

Abstract

The invention provides a control method of a compressor and a refrigerator. The control method comprises the following steps: starting a PFC function to run for preset time t1; and the target rotating speed of the compressor is modified into the corresponding compressor target rotating speed n2 after the PFC function is started, and the current weak magnetic parameter or the bus voltage parameter of the compressor is adjusted according to the target rotating speed n2 to improve the operation efficiency of the compressor. Whether the PFC function is started or not is determined according to the rotating speed and the power of the compressor, after the PFC function is started, the target rotating speed is adjusted, if the target rotating speed is not reached, the current flux weakening depth can be adjusted to keep stable compression operation at a high efficiency, and when the rotating speed requirement is increased and changed again, the flux weakening depth can be adjusted firstly, and the efficiency is improved. And after adjustment, the compression rotating speed still cannot be increased, the voltage is adjusted again, after the rotating speed reaches the target rotating speed, the flux weakening depth can be adjusted again, and the voltage and the flux weakening depth of the motor are adjusted in such a circulation mode, so that the compressor stably operates under high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a compressor control method and a refrigerator. Background Art

[0002] As the demand for commercial refrigerators increases, the requirements for high-power equipment are also gradually increasing, and the requirements for power factor are becoming more stringent. Therefore, commercial refrigerators are gradually introducing power factor correction (PFC) technology to maintain an approximately constant phase difference between the input current and the input voltage, thereby improving the power factor and optimizing the harmonic current to reduce the harm of harmonics to the stability of the power grid.

[0003] Existing PFC control schemes usually use a single voltage control mode. In this mode, when the voltage is boosted by the PFC circuit, the power loss of the switch tube increases with the increase in voltage. At the same time, as the output voltage increases, the power and power factor of the system will also increase. However, this fixed boost method has significant limitations in some scenarios.

[0004] For example, when the compressor is running at high speed and requires weak magnetic control, the traditional fixed voltage boost solution often cannot meet the comprehensive performance requirements of the system. The single voltage control and fixed weak magnetic depth setting not only lead to a significant increase in the power consumption of the switch tube, but also have an adverse effect on the operating efficiency of the motor. In this case, the switch tube suffers greater losses during high-load operation, and the high-speed operating efficiency of the motor is difficult to fully exert. Summary of the invention

[0005] In order to solve the technical problem that the PFC control scheme in the prior art usually adopts a single voltage control mode with low efficiency, the present invention provides a compressor control method and a refrigerator.

[0006] The technical solution adopted by the present invention is:

[0007] The present invention provides a method for controlling a compressor, comprising the steps of:

[0008] After turning on the PFC function and running for the preset time t1;

[0009] The target speed of the compressor is modified to the target speed n2 of the compressor corresponding to when the PFC function is turned on. The current weak magnetic parameters or bus voltage parameters of the compressor are adjusted according to the target speed n2 to improve the operating efficiency of the compressor.

[0010] Further, adjusting the current magnetic weakening parameter or bus voltage parameter of the compressor according to the target speed n2 specifically includes:

[0011] Determine whether the compressor speed n is less than the target speed n2;

[0012] If yes, the compressor speed is increased by adjusting the current magnetic weakening parameter of the compressor to X2;

[0013] If not, keep the current running state.

[0014] Furthermore, after the compressor speed is increased by adjusting the current magnetic weakening parameter of the compressor to X2, it is determined again whether the compressor speed n is less than the target speed n2;

[0015] If yes, increase the bus voltage parameter until the compressor speed n is equal to the target speed n2;

[0016] If not, keep the current running state.

[0017] The present invention also includes the steps of: after the target speed of the compressor is modified to the target speed n2 of the compressor corresponding to when the PFC function is turned on, if the compressor obtains a demand for continued speed increase, after reaching the compressor target speed n2 and running for a preset time t2, the target speed of the compressor is modified to the target speed n3 corresponding to the speed increase demand, and then the current weak magnetic parameters or bus voltage parameters of the compressor are adjusted according to the compressor target speed n3 to improve the operating efficiency of the compressor.

[0018] Further, adjusting the current magnetic weakening parameter or bus voltage parameter of the compressor according to the compressor target speed n3 specifically includes:

[0019] Determine whether the compressor speed n is less than the target speed n3;

[0020] If yes, adjust the current weak magnetic parameter of the compressor to X3 to increase the compressor speed;

[0021] If not, keep the current running state.

[0022] Further, after adjusting the current magnetic weakening parameter of the compressor to X3, it is determined whether the compressor speed n reaches the target speed n3;

[0023] If yes, keep the current running state;

[0024] If not, increase the bus voltage parameter to a preset value to increase the compressor speed.

[0025] Furthermore, after maintaining the current operating state, the current weak magnetic parameters and the operating efficiency of the motor under conditions close to the current weak magnetic parameters are calculated, the weak magnetic parameters corresponding to the maximum operating efficiency of the motor are obtained, and the current weak magnetic parameters of the compressor are adjusted to the weak magnetic parameters corresponding to the maximum operating efficiency of the motor.

[0026] Further, after the bus voltage parameter is increased by a preset value to increase the compressor speed, it is determined whether the compressor speed n reaches the target speed n3;

[0027] If yes, keep the current running state;

[0028] If not, continue to adjust the current weak magnetic parameters of the compressor and run for a preset time t3. If the compressor speed still does not reach the target speed n3, continue to increase the bus voltage parameters until the compressor speed n is equal to the target speed n3.

[0029] Furthermore, the calculation of the current weak magnetic parameters and the operating efficiency of the motor under the conditions close to the current weak magnetic parameters specifically includes:

[0030] The current weak magnetic parameters and the electromagnetic torque Te corresponding to the current weak magnetic parameters are obtained, the motor output power P1=Te*n is calculated, the motor input power P2 is obtained, and the motor operation efficiency η=P1 / P2 is calculated through P1 and P2.

[0031] When the compressor speed n is greater than or equal to the preset speed n1, or the compressor input power P is greater than or equal to the preset power P1, the PFC function is turned on to improve the power factor.

[0032] The present invention also provides a refrigerator, which uses the above-mentioned compressor control method to improve the operating efficiency of the compressor.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. After entering the PFC function, the present invention directly increases the target speed of the compressor to avoid the increase in the loss of the switch tube caused by running the PFC mode at low speed and low power; and adjusts the weak magnetic parameters or the bus voltage according to whether the target speed is reached, so that the speed is close to the target speed, thereby improving the flexibility of weak magnetic control and improving the operating efficiency of the compressor.

[0035] 2. When the speed demand increases and changes again, the weak magnetic depth can be adjusted first. If the compression speed still cannot be increased after adjustment, the voltage can be adjusted again. When the speed reaches the target speed, the weak magnetic depth can be adjusted again. In this way, the voltage and the weak magnetic depth of the motor can be adjusted in a cycle to allow the compressor to run stably at a higher efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 is a flow chart of an embodiment of the present invention;

[0038] Figure 2 is a flow chart of a first embodiment of the present invention;

[0039] Figure 3 is a flow chart of a further embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0042] For example, when the compressor is running at high speed and requires weak magnetic control, the traditional fixed voltage boost solution often cannot meet the comprehensive performance requirements of the system. The single voltage control and fixed weak magnetic depth setting not only lead to a significant increase in the power consumption of the switch tube, but also have an adverse effect on the operating efficiency of the motor. In this case, the switch tube suffers greater losses during high-load operation, and the high-speed operating efficiency of the motor is difficult to fully exert.

[0043] In view of the above problems, the existing compressor control method needs to be further optimized to reduce the switch tube loss and improve the efficiency of the motor at high speed operation, while meeting the higher requirements of modern commercial refrigerators for power factor and energy efficiency.

[0044] like Figure 1 As shown, the present invention proposes a compressor control method, comprising the steps of:

[0045] Set the target speed n2 of the compressor corresponding to the power factor correction (PFC) function to ensure that the compressor operating parameters match the target state after the PFC function is enabled;

[0046] After turning on the PFC function and running for the preset time t1;

[0047] The current target speed of the compressor is modified to the corresponding target speed n2 of the compressor after the PFC function is turned on to meet the requirements of the PFC operation mode; the current weak magnetic parameters or bus voltage parameters of the compressor are adjusted according to the target speed n2 to improve the operating efficiency of the compressor.

[0048] After entering the PFC function, the present invention directly increases the target speed of the compressor to avoid the increase in loss of the switching tube caused by running the PFC mode at low speed and low power; and adjusts the weak magnetic parameters or the bus voltage according to whether the target speed is reached, so that the speed is close to the target speed, thereby improving the flexibility of weak magnetic control and improving the operating efficiency of the compressor.

[0049] In a specific embodiment, Figure 2 As shown, adjusting the current weak magnetic parameters or bus voltage parameters of the compressor according to the target speed n2 specifically includes the following steps:

[0050] Determine whether the current speed n of the compressor is less than the target speed n2;

[0051] If the current speed n is less than the target speed n2, the compressor speed is increased by adjusting the current magnetic weakening parameter of the compressor to a new parameter value X2, so as to ensure that the compressor speed gradually approaches the target speed n2;

[0052] If the current speed n is not less than the target speed n2, the current operating state of the compressor is maintained to maintain the stability and operating efficiency of the system.

[0053] The present invention enables the compressor to flexibly respond to different operating conditions by dynamically adjusting the weak magnetic parameters, thereby effectively improving the accuracy and response speed of speed control. At the same time, it avoids the additional power loss that may be caused by unnecessary weak magnetic adjustment or bus voltage adjustment, and further improves the operating efficiency of the compressor.

[0054] In a specific embodiment, after the compressor speed is increased by adjusting the current magnetic weakening parameter of the compressor to X2, the following steps are performed again:

[0055] Determine whether the current speed n of the compressor is still less than the target speed n2;

[0056] If the current speed n is less than the target speed n2, the bus voltage parameter is further increased to gradually increase the speed of the compressor until the compressor speed n is equal to the target speed n2;

[0057] If the current speed n is not less than the target speed n2, the current operating state is maintained to ensure stable operation of the system and avoid unnecessary parameter adjustments.

[0058] When adjusting the weak magnetic parameters cannot increase the compressor to the target speed, the speed can be increased by increasing the bus voltage to improve the operating efficiency of the compressor.

[0059] like Figure 3 As shown, the present invention also proposes an embodiment, specifically:

[0060] The target speed of the compressor is set to n2, which corresponds to the operating requirements after the power factor correction (PFC) function is turned on. After the PFC function is started, the compressor runs to the target speed n2 and maintains it for the preset time t2. During this period, the compressor's weak magnetic parameters or bus voltage parameters are adjusted to ensure that the compressor can operate efficiently and achieve the expected performance.

[0061] When a speed increase requirement is detected during the operation of the compressor, the target speed is adjusted from n2 to a new target speed n3 corresponding to the speed increase requirement. The current magnetic weakening parameters or bus voltage parameters of the compressor are adjusted according to the compressor target speed n3 to improve the operating efficiency of the compressor.

[0062] This embodiment improves the compressor's responsiveness to speed increase requirements and shortens the speed adjustment response time by setting the target speed in stages and optimizing dynamic parameters. The optimization of weak magnetic parameters and the coordinated adjustment of bus voltage effectively reduce the power loss of the switch tube while ensuring the operating efficiency of the compressor at different target speeds. While adapting to a variety of operating conditions, this method improves the energy efficiency of the compressor and is particularly suitable for scenarios with high power factor correction requirements.

[0063] In a further embodiment, when the target speed of the compressor is adjusted to n3, the current magnetic weakening parameters or bus voltage parameters of the compressor are optimized and adjusted according to the target speed n3. Specifically, the following operations are included:

[0064] Determine whether the current speed n of the compressor is less than the target speed n3;

[0065] If the current speed n is less than the target speed n3, the magnetic weakening parameter of the compressor is adjusted to a new set value X3 to increase the speed of the compressor so that it gradually approaches the target speed n3.

[0066] If the current speed n has reached or exceeded the target speed n3, the current operating state is maintained without making additional adjustments to the weak magnetic parameters or bus voltage parameters, thereby avoiding efficiency reduction or unstable operation caused by unnecessary parameter changes.

[0067] This embodiment further improves the flexibility and accuracy of speed regulation by monitoring the current speed of the compressor and adjusting the weak magnetic parameters or bus voltage parameters in accordance with the target speed requirements. The optimization of weak magnetic parameters effectively reduces the power loss of the switch tube and ensures the efficient and stable operation of the compressor at the target speed. It is suitable for working conditions where the compressor needs to adjust the speed frequently, providing important guarantees for the operating reliability and energy efficiency improvement of the overall system.

[0068] In a further embodiment, after the current magnetic weakening parameter of the compressor is adjusted to X3, it is determined again whether the current speed n of the compressor reaches the target speed n3. If the current speed n has reached the target speed n3, the current operating state is maintained, and the current magnetic weakening parameter and bus voltage parameter are maintained to ensure system stability and efficient operation.

[0069] If the current speed n does not reach the target speed n3, the bus voltage parameter is further increased to the preset value, and the compressor speed is increased by increasing the voltage driving force, so that it gradually approaches the target speed n3. This adjustment process ensures that when the weak magnetic parameter adjustment is insufficient, the system can still achieve the target speed requirement through the optimization of the bus voltage.

[0070] This embodiment improves the responsiveness and efficiency of the compressor speed increase by gradually optimizing the coordinated adjustment of the weak magnetic parameters and the bus voltage parameters. When the adjustment of the weak magnetic parameters fails to make the speed meet the target requirements, the improvement of the bus voltage parameters provides additional driving guarantee, avoiding performance loss or instability caused by insufficient adjustment of a single parameter during the adjustment process.

[0071] In a further embodiment, after the current weak magnetic parameter of the compressor is adjusted to X3 and the compressor speed n reaches the target speed n3, the operation state maintenance phase is entered and the optimization steps of the motor operating efficiency are executed, specifically including: calculating the current weak magnetic parameter and the operating efficiency of the motor (the motor of the compressor) close to the current weak magnetic parameter, obtaining the maximum operating efficiency of the motor, and determining the weak magnetic parameter value corresponding to the maximum operating efficiency of the motor.

[0072] After obtaining the weakening magnetic parameters corresponding to the maximum operating efficiency of the motor, the current weakening magnetic parameters of the compressor are adjusted to the optimal weakening magnetic parameters to ensure that the compressor can not only run smoothly at the target speed n3, but also achieve the optimal efficiency of the motor. Through this optimization process, energy consumption is further reduced while meeting the target speed, and the overall economic efficiency of the compressor operation is improved.

[0073] This embodiment dynamically optimizes the motor operating efficiency. When the speed meets the standard, the weak magnetic parameters can be accurately optimized according to the motor efficiency to avoid possible efficiency loss problems, so that the compressor always maintains the optimal performance point during long-term operation. This method is particularly suitable for application scenarios with high energy efficiency requirements.

[0074] In a further embodiment, after the bus voltage parameter is increased to a preset value to increase the compressor speed, it is first determined whether the current speed n of the compressor has reached the target speed n3;

[0075] If the speed of the compressor has reached the target speed n3, the system maintains the current operating state to ensure that the compressor operates stably at the target speed;

[0076] If the compressor speed n does not reach the target speed n3, continue to adjust the current weakening magnetic parameters of the compressor, and let the system run for the preset time t3 to further increase the speed of the compressor; after running for the preset time t3, determine again whether the compressor speed has reached the target speed n3; if it still does not reach the target speed n3, continue to increase the bus voltage parameters until the compressor speed reaches the target speed n3, or adjust the weakening magnetic parameters again after increasing the bus voltage parameters, and repeat the adjustment cycle until the target speed n3 is reached.

[0077] This embodiment ensures that the compressor can reach the target speed by combining the cyclic adjustment mechanism of bus voltage and weak magnetic parameters. After the bus voltage is initially increased, if the target speed is not achieved, the system will optimize the speed increase process by adjusting the weak magnetic parameters to avoid over-reliance on a single parameter adjustment. Finally, by gradually increasing the bus voltage, the compressor can smoothly reach the expected speed, improving the stability and response speed of the system. While meeting the target speed requirements, this method effectively reduces the energy loss in the adjustment process, ensuring the efficient and stable operation of the compressor under different operating conditions, and is suitable for high-efficiency and energy-saving applications that require rapid adjustment of the speed.

[0078] Specifically, calculating the current weak magnetic parameters and the operating efficiency of the motor under the conditions close to the current weak magnetic parameters includes:

[0079] Get the current weak magnetic parameter X3 and the electromagnetic torque Te corresponding to the current weak magnetic parameter, calculate the motor output power P1=Te*n, and get the motor input power P2. The motor input power P2 can be calculated through the motor input voltage and current; then calculate the motor operation efficiency η=P1 / P2 through P1 and P2.

[0080] After the motor reaches the target speed, it can be considered that the motor's load torque Tl and electromagnetic torque Te are approximately equal. The motor's output power P1 can be calculated from the speed and electromagnetic torque; the motor's input power P2 can be calculated from the motor's input voltage and current; the motor's operating efficiency η=P1 / P2 can be calculated from P1 and P2.

[0081] Taking the case where the speed reaches n3 as an example, the weakening magnetic parameter at this time is c (the specific value of the weakening magnetic parameter X3), and the corresponding electromagnetic torque is Te; the weakening magnetic parameters c1, c2, c3, c4, c5 and c6 are selected to float around c, and the range can be selected according to demand. The electromagnetic torques corresponding to the above weakening magnetic parameters are Te1, Te2, Te3, Te4, Te5 and Te6, etc. The output power of the motor at this time is calculated respectively by the formula P1=Te*n, and then the input power P2 of the motor is calculated. Finally, the operating efficiency under different weakening magnetic parameters is calculated by the formula η=P1 / P2, and the weakening magnetic parameter corresponding to the maximum operating efficiency is selected as the weakening magnetic parameter of the current motor operation.

[0082] In a specific embodiment, when the compressor speed n is greater than or equal to a preset speed n1, or the compressor input power P is greater than or equal to a preset power Pz, the PFC function is turned on to improve the power factor.

[0083] Since turning on PFC at low speed and low power will not only increase the loss of the switching tube, but also will not significantly improve the efficiency of the compressor, thus wasting resources, the PFC function is turned on when the compressor speed exceeds a certain speed.

[0084] The present invention also provides a refrigerator, which uses the above-mentioned compressor control method to improve the operating efficiency of the compressor.

[0085] Refrigerators that adopt this control method can determine the demand for different voltages based on the compressor (or motor) speed depending on whether the PFC function is turned on, and adjust the weak magnetic depth under different voltages, thereby improving the flexibility of weak magnetic control, improving the operating efficiency of the compressor, and enhancing the competitiveness of the product.

[0086] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0087] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0088] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0089] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0090] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling a compressor, characterized in that: Includes steps: After turning on the PFC function and running for the preset time t1; The target speed of the compressor is modified to the target speed n2 of the compressor corresponding to when the PFC function is turned on. The current weak magnetic parameters or bus voltage parameters of the compressor are adjusted according to the target speed n2 to improve the operating efficiency of the compressor.

2. The compressor control method according to claim 1, characterized in that: The step of adjusting the current magnetic weakening parameter or bus voltage parameter of the compressor according to the target speed n2 specifically includes: Determine whether the compressor speed n is less than the target speed n2; If yes, the compressor speed is increased by adjusting the current magnetic weakening parameter of the compressor to X2; If not, keep the current running state.

3. The method for controlling a compressor according to claim 2, wherein: After the compressor speed is increased by adjusting the current weak magnetic parameter of the compressor to X2, it is determined again whether the compressor speed n is less than the target speed n2; If yes, increase the bus voltage parameter until the compressor speed n is equal to the target speed n2; If not, keep the current running state.

4. The method for controlling a compressor according to claim 1, wherein: It also includes the steps of: after the target speed of the compressor is modified to the compressor target speed n2 corresponding to the compressor after the PFC function is turned on, if the compressor obtains a demand for continuing to increase the speed, after reaching the compressor target speed n2 and running for a preset time t2, the target speed of the compressor is modified to the target speed n3 corresponding to the speed increase demand, and then the current weak magnetic parameters or bus voltage parameters of the compressor are adjusted according to the compressor target speed n3 to improve the operating efficiency of the compressor.

5. The method for controlling a compressor according to claim 4, characterized in that: The step of adjusting the current magnetic weakening parameter or bus voltage parameter of the compressor according to the compressor target speed n3 specifically includes: Determine whether the compressor speed n is less than the target speed n3; If yes, adjust the current magnetic weakening parameter of the compressor to X3 to increase the compressor speed; If not, keep the current running state.

6. The method for controlling a compressor according to claim 5, characterized in that: After adjusting the current weak magnetic parameter of the compressor to X3, determine whether the compressor speed n reaches the target speed n3; If yes, keep the current running state; If not, increase the bus voltage parameter to a preset value to increase the compressor speed.

7. The method for controlling a compressor according to claim 6, wherein: After maintaining the current operating state, calculate the current weak magnetic parameters and the operating efficiency of the motor under weak magnetic parameters close to the current weak magnetic parameters, obtain the weak magnetic parameters corresponding to the maximum operating efficiency of the motor, and adjust the current weak magnetic parameters of the compressor to the weak magnetic parameters corresponding to the maximum operating efficiency of the motor.

8. The method for controlling a compressor according to claim 6, wherein: After increasing the bus voltage parameter by a preset value and increasing the compressor speed, it is determined whether the compressor speed n reaches the target speed n3; If yes, keep the current running state; If not, continue to adjust the current weak magnetic parameters of the compressor and run for a preset time t3. If the compressor speed still does not reach the target speed n3, continue to increase the bus voltage parameters until the compressor speed n is equal to the target speed n3.

9. The method for controlling a compressor according to claim 7, wherein: Calculating the motor operating efficiency under the current weak magnetic parameters and weak magnetic parameters close to the current weak magnetic parameters specifically includes: Obtain the current weak magnetic parameters and the electromagnetic torque Te corresponding to the weak magnetic parameters close to the current weak magnetic parameters, calculate the motor output power P1=Te*n, obtain the motor input power P2, and calculate the motor operation efficiency η=P1 / P2 through P1 and P2.

10. The method for controlling a compressor according to claim 1, wherein: When the compressor speed n is greater than or equal to the preset speed n1, or the compressor input power P is greater than or equal to the preset power P1, the PFC function is turned on to improve the power factor.

11. A refrigerator, characterized in that: The compressor control method according to any one of claims 1 to 10 is used to improve the operating efficiency of the compressor.

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