Control method, control apparatus, household appliance, and storage medium

Abstract

A control method and apparatus (100) for a single-phase permanent magnet synchronous motor (10), a household appliance (200), and a storage medium. The control method comprises: acquiring voltage characteristics of a power frequency voltage applied to the single-phase permanent magnet synchronous motor (10) (01); acquiring a position trend of a rotor of the single-phase permanent magnet synchronous motor (10) (02); and controlling on / off of a switch (11) on the basis of the voltage trend and the position trend of the rotor, so that the position trend of the rotor matches the voltage characteristic, wherein the switch (11) is used for controlling on / off of the current of the single-phase permanent magnet synchronous motor (10) (03).

Description

Control methods, control devices, household appliances and storage media

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 202411448738.4, filed with the China National Intellectual Property Administration on October 16, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of household appliance technology, specifically to a control method and device for a single-phase permanent magnet synchronous motor, a household appliance, and a storage medium. Background Technology

[0004] Single-phase permanent magnet synchronous motors (SPPMSMs) have the advantages of simple structure and low cost, making them suitable for driving small-power water pumps, fans, etc., and are widely used in civil and commercial fields, especially in the home appliance industry. However, single-phase permanent magnet synchronous motors consume relatively large amounts of power during light-load operation. Summary of the Invention

[0005] This application provides a control method and apparatus for a single-phase permanent magnet synchronous motor, a household appliance, and a computer-readable storage medium.

[0006] This application provides a control method for a single-phase permanent magnet synchronous motor. The control method includes: acquiring the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor; acquiring the rotor position trend of the single-phase permanent magnet synchronous motor; controlling the on / off state of a switch according to the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, wherein the switch is used to control the current flow of the single-phase permanent magnet synchronous motor.

[0007] In the control method of the single-phase permanent magnet synchronous motor of this application, the switching on and off is controlled according to the voltage trend and the rotor position trend so that the rotor position trend matches the voltage characteristics. When the single-phase permanent magnet synchronous motor is running under light load, the influence of excessive rotation speed caused by excessive power of the single-phase permanent magnet synchronous motor can be reduced, thereby reducing the power consumption of the motor.

[0008] In some embodiments, obtaining the position trend of the rotor of the single-phase permanent magnet synchronous motor includes: detecting the magnetic field change trend of the rotor through a sensor; and using the magnetic field change trend detected by the sensor as the position trend of the rotor.

[0009] In some embodiments, taking the magnetic field change trend detected by the sensor as the position trend of the rotor includes: obtaining the magnetic field increase trend and magnetic field decrease trend corresponding to half a cycle of the rotor and the power frequency voltage; and taking the change trend of the largest proportion of the magnetic field increase trend and the magnetic field decrease trend as the position trend.

[0010] In some embodiments, the voltage characteristic includes positive and negative polarity, and controlling the switching on and off according to the voltage trend and the rotor position trend to match the rotor position trend with the voltage characteristic includes: when the voltage characteristic is positive polarity and the rotor position trend is increasing, controlling the switch to turn on the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0011] In some embodiments, the voltage characteristic includes positive and negative polarity. The step of controlling the switching on and off according to the voltage trend and the rotor position trend to match the rotor position trend with the voltage characteristic further includes: when the voltage characteristic is positive polarity and the rotor position trend is decreasing, controlling the switch to turn off the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0012] In some embodiments, the voltage characteristic includes positive and negative polarity. The step of controlling the switching on and off according to the voltage trend and the rotor position trend to match the rotor position trend with the voltage characteristic further includes: when the voltage characteristic is negative polarity and the rotor position trend is increasing, controlling the switch to turn off the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0013] In some embodiments, the voltage characteristic includes positive and negative polarity. The step of controlling the switching on and off according to the voltage trend and the rotor position trend to match the rotor position trend with the voltage characteristic further includes: when the voltage characteristic is negative polarity and the rotor position trend is decreasing, controlling the switch to turn on the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0014] This application also provides a control device for a single-phase permanent magnet synchronous motor. The control device includes a voltage detection module, a position detection module, and a control module. The voltage detection module is used to acquire the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor. The position detection module is used to acquire the position trend of the rotor of the single-phase permanent magnet synchronous motor. The control module is used to control the on / off state of a switch according to the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics. The switch is used to control the current flow of the single-phase permanent magnet synchronous motor.

[0015] This application also provides a household appliance, which includes a single-phase permanent magnet synchronous motor, a memory, and a processor. The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the control method of the single-phase permanent magnet synchronous motor described above.

[0016] This application also provides a computer-readable storage medium storing a computer program, characterized in that, when the program is processed by a processor, it implements the control method for a single-phase permanent magnet synchronous motor as described above.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 is a schematic flowchart of one of the control methods for a single-phase permanent magnet synchronous motor according to some embodiments of this application;

[0020] Figure 2 is a schematic diagram of the control device for a single-phase permanent magnet synchronous motor according to some embodiments of this application;

[0021] Figure 3 is a schematic diagram of the structure of a household appliance according to some embodiments of this application;

[0022] Figure 4 is a control block diagram of a control method for a single-phase permanent magnet synchronous motor according to some embodiments of this application;

[0023] Figure 5 shows voltage characteristic curves and rotor position signal curves of some embodiments of this application;

[0024] Figure 6 is a second schematic flowchart of a control method for a single-phase permanent magnet synchronous motor according to some embodiments of this application;

[0025] Figure 7 is a schematic flowchart of a control method for a single-phase permanent magnet synchronous motor according to some embodiments of this application (Part 3).

[0026] Figure 8 is a flowchart of a control method for a single-phase permanent magnet synchronous motor according to some embodiments of this application.

[0027] Icon labels:

[0028] Household appliances 200, control device 100, single-phase permanent magnet synchronous motor 10, switch 11, voltage detection module 12, position detection module 13, control module 14, memory 20, processor 30, power frequency polarity detection circuit 40, sensor 50. Embodiments of the present invention

[0029] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X existing alone, X and Y existing simultaneously, and Y existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0034] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0035] Please refer to Figure 1. This application provides a control method for a single-phase permanent magnet synchronous motor 10. The control method includes:

[0036] 01. Obtain the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor 10;

[0037] 02. Obtain the position trend of the rotor of the single-phase permanent magnet synchronous motor 10;

[0038] 03. The switch 11 is turned on and off according to the voltage trend and the rotor position trend so that the rotor position trend matches the voltage characteristics. The switch 11 is used to control the current on and off of the single-phase permanent magnet synchronous motor 10.

[0039] Please refer to Figure 2. This application also provides a control device 100 for a single-phase permanent magnet synchronous motor 10. The control device 100 includes a voltage detection module 12, a position detection module 13, and a control module 14.

[0040] In this process, step 01 can be implemented by the voltage detection module 12, step 02 by the position detection module 13, and step 03 by the control module 14. Alternatively, the voltage detection module 12 is used to acquire the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor 10. The position detection module 13 is used to acquire the position trend of the rotor of the single-phase permanent magnet synchronous motor 10. The control module 14 is used to control the on / off state of the switch 11 based on the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics.

[0041] Referring to Figure 3, this application also provides a household appliance 200, which includes a single-phase permanent magnet synchronous motor 10, a memory 20, and a processor 30. The processor 30 reads executable program code stored in the memory 20 to run a program corresponding to the executable program code, in order to implement the control method of the single-phase permanent magnet synchronous motor 10 described above. That is, the processor 30 is used to obtain the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor 10, obtain the position trend of the rotor of the single-phase permanent magnet synchronous motor 10, and control the on / off state of the switch 11 according to the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics.

[0042] In the control method, apparatus, household appliance 200, and storage medium of the single-phase permanent magnet synchronous motor 10 according to the embodiments of this application, by controlling the on and off of the switch 11 according to the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, the single-phase permanent magnet synchronous motor 10 can be operated under light load, thereby reducing the impact of excessive rotation speed caused by excessive power of the single-phase permanent magnet synchronous motor 10, and thus reducing the power consumption of the single-phase permanent magnet synchronous motor 10.

[0043] Specifically, the single-phase permanent magnet synchronous motor 10 is an electric motor powered by a single-phase AC power supply. Its rotor is excited by permanent magnets, while the stator has windings. The permanent magnets on the rotor generate a constant magnetic field. When the stator windings are energized, a rotating magnetic field is generated. The direction and magnitude of this rotating magnetic field can be controlled by changing the current in the stator windings. When the magnetic axis of the stator magnetic field aligns with the magnetic axis of the permanent magnets, the interaction between them generates a torque, thereby driving the single-phase permanent magnet synchronous motor 10 to start rotating.

[0044] When a single-phase permanent magnet synchronous motor is running, it will maintain a high speed and power under heavy load conditions. If the load changes and becomes lighter, the single-phase permanent magnet synchronous motor will experience problems such as excessive speed and high power consumption.

[0045] In response, this application determines whether the speed of the single-phase permanent magnet synchronous motor 10 is too fast by detecting whether the rotor position trend matches the voltage characteristics of the power frequency voltage. If the change in rotor position trend leads the change in the voltage characteristics of the power frequency voltage, it indicates that the speed of the single-phase permanent magnet synchronous motor 10 is too fast. In this case, the current in the stator winding is changed, and the magnetic field generated by the stator is changed, thereby adjusting the speed and direction of the single-phase permanent magnet synchronous motor 10 and reducing the power consumption of the single-phase permanent magnet synchronous motor 10.

[0046] In step 01, the power frequency voltage refers to the unified standard voltage for the power industry and electrical equipment as stipulated by the state. In China, the power frequency voltage for a single-phase power supply is 220V, and the frequency is 50Hz.

[0047] As alternating current, power frequency voltage typically exhibits a sinusoidal voltage characteristic curve, and its direction changes periodically over time. The power frequency voltage characteristics described in this application's embodiments may include positive and negative polarities, which are used to distinguish the direction of the alternating current voltage. The power frequency voltage characteristic is that the voltage direction is positive in the first half of the cycle, increasing from zero to a peak value and then decreasing to zero; the voltage direction is negative in the second half of the cycle, increasing to a peak value and then decreasing to zero, repeating this cycle periodically.

[0048] Please refer to Figures 4 and 5. In order to detect the voltage characteristic change of the power frequency voltage, the embodiment of this application uses the power frequency polarity detection circuit 40 to detect the AC voltage signal, convert the analog signal into a digital signal, and output the corresponding high and low level signals. When the level is high, it represents that the voltage characteristic is positive polarity, and when the level is low, it represents that the voltage characteristic is negative polarity.

[0049] In step 02, the rotor rotates continuously during operation of the single-phase permanent magnet synchronous motor 10 due to the magnetic field, and its position changes continuously over time. The rotor position trend refers to the trend of the rotor position signal changing over time, and the rotor position signal can be monitored and acquired by sensor 50.

[0050] In this embodiment, sensor 50 can be a Hall sensor. Hall sensors operate based on the Hall effect, whereby when current flows through a conductor in a magnetic field, the magnetic field deflects the charges in the conductor, creating a potential difference across the conductor, known as the Hall voltage. The Hall sensor can be mounted on the stator of the single-phase permanent magnet synchronous motor 10. With the stator stationary, the rotor's magnetic field changes with the rotor's position. The Hall sensor detects this change in magnetic field and generates a corresponding Hall voltage signal. Therefore, the Hall voltage signal is used as the rotor's position signal to reflect its positional trend.

[0051] In step 03, the voltage trend refers to whether the voltage characteristic of the power frequency voltage is positive or negative. The rotor position trend refers to whether the rotor position signal is increasing or decreasing. Matching the rotor position trend with the voltage characteristic means that within one half-cycle, the rotor position trend increases when the power frequency voltage characteristic is positive, or decreases when the power frequency voltage characteristic is negative. Anything outside these two cases indicates a mismatch between the rotor position trend and the voltage characteristic.

[0052] In some embodiments, switch 11 can be a bidirectional thyristor (BT), which is a semiconductor device with bidirectional conduction capability, capable of conducting under both forward and reverse voltages, and can be used as an effective switching element in AC circuits.

[0053] Please refer to Figure 6. In some embodiments, step 02 includes a sub-step:

[0054] 021, The trend of magnetic field change of the rotor is detected by sensor 50;

[0055] 022, the magnetic field change trend detected by sensor 50 is used as the rotor position trend.

[0056] In some embodiments, steps 021 and 022 can be implemented by the position detection module 13. Alternatively, the position detection module 13 can be used to detect the magnetic field change trend of the rotor through the sensor 50, and use the magnetic field change trend detected by the sensor 50 as the position trend of the rotor.

[0057] In some embodiments, the processor 30 can be used to detect the magnetic field change trend of the rotor through the sensor 50, and use the magnetic field change trend detected by the sensor 50 as the position trend of the rotor.

[0058] It should be noted that in the single-phase permanent magnet synchronous motor 10, the magnetic axis position of the stator magnetic field is changed by altering the current in the stator windings. This current change is continuous, therefore the magnetic axis position of the stator magnetic field is also constantly changing. Due to the interaction between the stator magnetic field and the permanent magnet magnetic field, the change in the magnetic axis position of the stator magnetic field drives the rotor to rotate continuously to adapt to the new magnetic field position.

[0059] Therefore, the magnetic field of the rotor is generated by the interaction between the magnetic field generated by the stator current and the permanent magnet in the rotor. The strength and direction of the rotor's magnetic field are related to the rotor's position, and the magnetic field changes as the rotor moves.

[0060] In step 021, the embodiments of this application can detect the changing trend of the rotor magnetic field using a Hall sensor. As previously described, the changing trend of the rotor magnetic field is reflected in the Hall sensor as a change in the magnitude of the Hall voltage.

[0061] In step 022, the rotor's magnetic field changes with the rotor's position. The Hall sensor can detect this change in the magnetic field and generate a corresponding Hall voltage signal. Therefore, the Hall voltage signal is used as the rotor's position signal, and the trend of magnetic field change detected by the Hall sensor is used as the rotor's position trend. Furthermore, since the magnetic field change trend is sinusoidal, the Hall voltage signal curve obtained by the Hall sensor is also sinusoidal, and this curve represents the rotor's position trend.

[0062] Please refer to Figure 7. In some embodiments, step 022 includes a sub-step:

[0063] 0221, obtain the increasing and decreasing magnetic field trends corresponding to the half-cycle of the rotor and the power frequency voltage;

[0064] 0222, the trend of the change of the largest proportion between the increasing trend of magnetic field and the decreasing trend of magnetic field is taken as the position trend.

[0065] In some embodiments, steps 0221 and 0222 can be implemented by the position detection module 13. Alternatively, the position detection module 13 can be used to obtain the magnetic field increasing trend and magnetic field decreasing trend corresponding to half a cycle of the rotor and the power frequency voltage, and take the changing trend of the larger of the magnetic field increasing trend and magnetic field decreasing trend as the position trend.

[0066] In some embodiments, the processor 30 can be used to obtain the magnetic field increasing trend and magnetic field decreasing trend corresponding to half a cycle of the rotor and the power frequency voltage, and take the changing trend of the one with the largest proportion of the magnetic field increasing trend and magnetic field decreasing trend as the position trend.

[0067] It should be noted that when the rotor starts rotating, its magnetic field also changes. However, due to electromagnetic induction, the change in the rotor magnetic field does not immediately follow the change in the power frequency voltage characteristic curve. This is because the change in the rotor magnetic field requires a certain amount of time to respond to the change in the stator current, and the change in the stator current is driven by the change in the power frequency voltage.

[0068] Specifically, when the stator's power frequency voltage changes, the stator current changes accordingly, generating a changing magnetic field. This changing magnetic field acts on the rotor, causing a change in the rotor's magnetic field. However, due to the rotor's inertia and the time delay in the electromagnetic induction process, the change in the rotor's magnetic field does not immediately synchronize with the change in the stator voltage. Therefore, the curve of the rotor's magnetic field change lags slightly behind the voltage characteristic curve of the power frequency voltage.

[0069] In addition, some factors in the design of the single-phase permanent magnet synchronous motor 10 need to be considered, such as the inductance and resistance parameters of the single-phase permanent magnet synchronous motor 10, which will also affect the phase relationship between the rotor magnetic field and the power frequency voltage.

[0070] In summary, please refer to Figure 5. The change curve of the rotor position signal, that is, the change trend of the rotor magnetic field, will lag slightly behind the change of the voltage characteristics of the power frequency voltage.

[0071] Therefore, in step 0221, within one half-cycle of the power frequency voltage in Figure 5, there will be two different trends, namely the magnetic field increasing trend and the magnetic field decreasing trend. For example, the magnetic field in region (1) shows an increasing trend, and the magnetic field in region (2) shows a decreasing trend. Overall, the rotor signal curve lags behind the power frequency voltage curve.

[0072] In step 0222, to avoid the lag in the change trend of the rotor magnetic field interfering with the determination of whether the rotor position trend is increasing or decreasing, the increasing and decreasing trends of the magnetic field corresponding to the half-cycle of the power frequency voltage can be compared, and the trend with the largest proportion can be taken as the position trend. For example, in Figure 5, in the first half-cycle when the power frequency voltage characteristic is positive, the magnetic field in region (1) shows an increasing trend, and the magnetic field in region (2) shows a decreasing trend. Region (1) has a larger proportion in the half-cycle, so the rotor position trend in this half-cycle is increasing.

[0073] Please refer to Figure 8. In some embodiments, the voltage characteristics include positive and negative polarities, and step 03 includes sub-steps:

[0074] 031. When the voltage characteristic is positive polarity and the rotor position trend is increasing, the control switch 11 turns on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

[0075] Please refer to Figure 8. In some embodiments, the voltage characteristics include positive and negative polarities, and step 03 further includes a sub-step:

[0076] 032, when the voltage characteristic is positive polarity and the rotor position trend is decreasing, the control switch 11 turns off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

[0077] Please refer to Figure 8. In some embodiments, the voltage characteristics include positive and negative polarities, and step 03 further includes a sub-step:

[0078] 033, when the voltage characteristic is negative polarity and the rotor position trend is increasing, the control switch 11 turns off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

[0079] Please refer to Figure 8. In some embodiments, the voltage characteristics include positive and negative polarities, and step 03 further includes a sub-step:

[0080] 034. When the voltage characteristic is negative and the rotor position trend is decreasing, the control switch 11 turns on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

[0081] In some embodiments, steps 031, 032, 033, and 034 can be implemented by the control module 14. Alternatively, the control module 14 can be used to control switch 11 to turn on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage when the voltage characteristic is positive and the rotor position trend is increasing, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is positive and the rotor position trend is decreasing, control switch 11 to turn off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is negative and the rotor position trend is increasing, control switch 11 to turn off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is negative and the rotor position trend is decreasing, control switch 11 to turn on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0082] In some embodiments, the processor 30 can be used to control switch 11 to turn on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage when the voltage characteristic is positive and the rotor position trend is increasing, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is positive and the rotor position trend is decreasing, the processor 30 can control switch 11 to turn off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is negative and the rotor position trend is increasing, the processor 30 can control switch 11 to turn off the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic; when the voltage characteristic is negative and the rotor position trend is decreasing, the processor 30 can control switch 11 to turn on the current of the single-phase permanent magnet synchronous motor 10 during the current half-cycle of the power frequency voltage, thereby matching the rotor position trend with the voltage characteristic.

[0083] In steps 031 and 034, when the voltage characteristic is positive and the rotor position trend is increasing, and when the voltage characteristic is negative and the rotor position trend is decreasing, it indicates that the rotor speed is normal and the rotor position trend matches the voltage characteristic of the power frequency voltage. This allows the bidirectional thyristor to be turned on to maintain the average voltage applied to the single-phase permanent magnet synchronous motor 10, thus maintaining the current rotor speed and ensuring that the rotor position trend continues to match the voltage characteristic of the power frequency voltage.

[0084] In steps 032 and 033, when the voltage characteristic is positive and the rotor position trend is decreasing, and when the voltage characteristic is negative and the rotor position trend is increasing, it indicates that the rotor speed is too fast and the rotor position trend is ahead of the voltage characteristic of the power frequency voltage. It is necessary to turn off the bidirectional thyristor, reduce the average voltage applied to the single-phase permanent magnet synchronous motor 10, reduce the current rotor speed, and make the rotor position trend match the voltage characteristic of the power frequency voltage, thereby reducing the power consumption of the single-phase permanent magnet synchronous motor 10.

[0085] Thus, the switching on and off of switch 11 is controlled according to the voltage trend and the rotor position trend so that the rotor position trend matches the voltage characteristics. By monitoring the voltage trend and the rotor position trend, the applied power frequency voltage for each half cycle is controlled. Under the condition of meeting the operation of single-phase permanent magnet synchronous motor 10 and load, the influence of excessive rotation speed caused by excessive power of single-phase permanent magnet synchronous motor 10 is reduced, thereby reducing the power consumption of single-phase permanent magnet synchronous motor 10.

[0086] This application also provides a computer-readable storage medium storing a computer program, characterized in that, when processed by a processor, the program implements the control method of the single-phase permanent magnet synchronous motor 10 described above. In some embodiments, the non-volatile computer-readable storage medium may be a storage medium built into a household appliance, such as a memory, or a storage medium that can be plugged into a household appliance, such as an SD card. In application scenarios requiring long-term storage of program code and data, the non-volatile computer-readable storage medium can maintain the stored information without loss even without a power supply, thereby ensuring the persistence and reliability of the data.

[0087] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processing module, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0089] It should be understood that various parts of the embodiments of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0090] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0091] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control method of a single-phase permanent magnet synchronous motor, characterized by, include: Obtain the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor; Obtain the position trend of the rotor of the single-phase permanent magnet synchronous motor; The switch is controlled to open and close based on the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics. The switch is used to control the current flow of the single-phase permanent magnet synchronous motor.

2. The control method according to claim 1, characterized by, The step of obtaining the rotor position trend of the single-phase permanent magnet synchronous motor includes: The trend of magnetic field change of the rotor is detected by sensors; The magnetic field change trend detected by the sensor is used as the position trend of the rotor.

3. The control method according to claim 2, characterized by, The step of using the magnetic field change trend detected by the sensor as the position trend of the rotor includes: Obtain the increasing and decreasing magnetic field trends of the rotor and the power frequency voltage corresponding to half a cycle; The trend of the change of the larger proportion of the increasing trend of the magnetic field and the decreasing trend of the magnetic field is taken as the position trend.

4. The control method according to claim 1, characterized by, The voltage characteristics include positive and negative polarities. Controlling the switching on and off based on the voltage trend and the rotor position trend to match the rotor position trend with the voltage characteristics includes: When the voltage characteristic is positive polarity and the rotor position trend is increasing, the switch is controlled to turn on the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

5. The control method according to claim 1, characterized by, The voltage characteristics include positive and negative polarities. The step of controlling the switching on and off based on the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, further includes: When the voltage characteristic is positive and the rotor position trend is decreasing, the switch is controlled to turn off the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

6. The control method according to claim 1, characterized by The voltage characteristics include positive and negative polarities. The step of controlling the switching on and off based on the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, further includes: When the voltage characteristic is negative and the rotor position trend is increasing, the switch is controlled to turn off the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

7. The control method according to claim 1, characterized by, The voltage characteristics include positive and negative polarities. The step of controlling the switching on and off based on the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, further includes: When the voltage characteristic is negative and the rotor position trend is decreasing, the switch is controlled to turn on the current of the single-phase permanent magnet synchronous motor during the current half-cycle of the power frequency voltage, so that the rotor position trend matches the voltage characteristic.

8. A control device for a single-phase permanent magnet synchronous motor, characterized in that, The control device includes: A voltage detection module is used to acquire the voltage characteristics of the power frequency voltage applied to the single-phase permanent magnet synchronous motor; A position detection module is used to obtain the position trend of the rotor of the single-phase permanent magnet synchronous motor; The control module is used to control the switching on and off of the switch according to the voltage trend and the rotor position trend, so that the rotor position trend matches the voltage characteristics, and the switch is used to control the current switching on and off of the single-phase permanent magnet synchronous motor.

9. A domestic appliance characterized in that, The method includes a single-phase permanent magnet synchronous motor, a memory, and a processor. The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the control method of the single-phase permanent magnet synchronous motor as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. When the program is processed by the processor, it implements the control method for a single-phase permanent magnet synchronous motor as described in any one of claims 1-7.

Images