Control method and control device of motor, electronic device and household appliance

Abstract

The application provides a control method and device of a motor, an electronic device and a household appliance. The motor is used in the household appliance, and the motor comprises a stator assembly and a rotor assembly. The rotor assembly is located on one side of the stator assembly along the axial direction of the rotor assembly. The stator assembly comprises three groups of windings, and the rotor assembly comprises a plurality of magnetic poles. The control method comprises the following steps: obtaining the running progress of the motor; in the case that the running progress is completed, controlling the rotor assembly to stop at a target position, and controlling two groups of windings to be turned on so that the polarity of the magnetic field generated by the two groups of windings is opposite to the polarity of the corresponding magnetic pole. The control method of the motor provided by the application greatly reduces the axial magnetic pulling force between the stator assembly and the rotor assembly in the motor shutdown state, so that the rotor assembly can be easily picked up.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510453752.1, filed on April 10, 2025, entitled "Control Method, Control Device, Electronic Equipment and Household Appliance of Electric Motor", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of household appliance technology, and more specifically, to a motor control method, control device, electronic device, and household appliance. Background Technology

[0003] Currently, in shaftless drive household appliances, the stator assembly and rotor assembly are separate, and the stator assembly and rotor assembly have a permanent magnet attraction when static. When it is necessary to separate the part where the stator assembly is located from the part where the rotor assembly is located, the weight of the part where the rotor assembly is located plus the attraction between the stator assembly and the rotor assembly makes it difficult to separate the two. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention provides a method for controlling an electric motor.

[0006] A second aspect of the present invention also provides a control device for an electric motor.

[0007] A third aspect of the present invention also provides an electronic device.

[0008] A fourth aspect of the present invention also provides a readable storage medium.

[0009] A fifth aspect of the present invention also provides a household appliance.

[0010] In view of this, a first aspect of the present invention provides a control method for an electric motor used in a household appliance. The motor includes a stator assembly and a rotor assembly. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. The control method includes: acquiring the running progress of the motor; when the running progress is completed, controlling the rotor assembly to stop at a target position, and controlling two sets of windings to conduct so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole.

[0011] The present invention provides a motor control method. The motor includes a rotor assembly and a stator assembly. The rotor assembly is located on one side of the stator assembly along the axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly and the stator assembly are separated, eliminating the need for a connecting shaft to transmit power between the parts connected to the rotor assembly and the parts connected to the stator assembly. This arrangement also reduces the axial thickness of the stator and rotor assemblies and the overall weight, thus facilitating the reduction of the overall height and weight of household appliances, making them easier to store and transport. Users can store the parts with the stator assembly and the parts with the rotor assembly separately, improving storage and portability. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. When the windings are energized, they generate a magnetic field. The rotation of the rotor assembly is achieved through the interaction between the magnetic field generated by the windings and the magnetic field generated by the magnetic poles. The motor control method includes acquiring the motor's running progress, controlling the rotor assembly to stop at the target position when the motor's running progress is completed, and controlling the two sets of windings to conduct, so that the magnetic fields generated by the two sets of windings are opposite in polarity to the corresponding magnetic poles. Thus, the magnetic fields generated by the windings and the magnetic fields generated by the corresponding magnetic poles repel each other, greatly reducing the axial magnetic pull between the stator assembly and the rotor assembly when the motor is stopped. This allows the rotor assembly to be easily lifted, making it easier to separate the parts connected to the rotor assembly from the parts connected to the stator assembly, and preventing the parts connected to the rotor assembly from shaking when the user lifts the rotor assembly with a large force.

[0012] In addition, by using the principle of axial magnetic flux coupling, the stator assembly and rotor assembly are set up separately, eliminating the need for a connecting shaft to transmit power and the need for a coupling to connect the shafts, thereby reducing the noise of the motor during operation.

[0013] Optionally, the rotor assembly and the stator assembly are spaced apart along the axial direction of the rotor assembly.

[0014] Optionally, the axis of the rotor assembly is arranged parallel to the axis of the stator assembly in the axial direction.

[0015] Optionally, the axis of the rotor assembly coincides with the axis of the stator assembly in the axial direction, so that the stator assembly and the rotor assembly are arranged in parallel.

[0016] In some embodiments, optionally, the step of controlling the rotor assembly to stop at the target position and controlling the two sets of windings to conduct includes: controlling the rotor assembly to stop at the target position, determining the two sets of windings to be conducted according to the correspondence between the target position and the two sets of windings to be conducted, and finding the electrical parameter information of the two sets of windings to be conducted; controlling the two sets of windings to conduct according to the electrical parameter information; wherein, the electrical parameter information includes the current amplitude and current direction, and at the target position, the tension value between the stator assembly and the rotor assembly along the axial direction is less than or equal to the target tension value.

[0017] In this embodiment, the steps of controlling the rotor assembly to stop at the target position and controlling the two sets of windings to conduct include: controlling the rotor assembly to stop at the target position; then, determining the two sets of windings to be conducted based on the correspondence between the target position of the rotor assembly and the windings to be conducted; further determining the electrical parameter information of the two sets of windings to be conducted; and then controlling the two sets of windings to conduct according to the found electrical parameter information, so that the magnetic field generated by the two sets of windings is opposite in polarity to the magnetic field of the rotor assembly at the target position, thereby making the axial tension value between the stator assembly and the rotor assembly less than or equal to the target tension value, so that the user can lift the part connected to the rotor assembly. The electrical parameter information includes the current amplitude and current direction to ensure that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic poles.

[0018] In some embodiments, optionally, before the step of obtaining the motor's running progress, the method further includes: storing the correspondence between the electrical parameter information of the two sets of windings that need to be turned on and the target position.

[0019] In this embodiment, the correspondence between the target position and the electrical parameters of the conducting winding is stored in advance, so that when the motor running progress ends, the rotor assembly is controlled to stop at the target position, and the winding is turned on according to the correspondence, making it easier to separate the stator assembly and the rotor assembly.

[0020] In some embodiments, optionally, the current directions of the two sets of windings corresponding to the target position are opposite, and the current amplitudes of the two sets of windings corresponding to the target position are the same.

[0021] In this embodiment, the currents in the two sets of windings corresponding to the target position are in opposite directions and have the same amplitude, causing the two sets of windings to repel each other from their corresponding magnetic poles. This makes it easier to separate the stator assembly and the rotor assembly when the motor operation ends. Simultaneously, this limitation also ensures that the two sets of windings form a closed loop, guaranteeing the reliability of the circuit.

[0022] In some embodiments, the target position may optionally include the rotor position angle of the rotor assembly, the angle value of which is equal to 20k°; where k is a natural number and k is less than or equal to 18.

[0023] In this embodiment, the target position includes the rotor position angle of the rotor assembly. Optionally, the angle value of the rotor position angle is equal to 20k°, that is, the rotor position angle is 20 times any natural number from 0 to 18. At different rotor position angles, the windings that need to be turned on are different.

[0024] According to a second aspect of the invention, a control device for an electric motor is also provided. The motor is used in a household appliance and includes a stator assembly and a rotor assembly. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. The control device includes: an acquisition unit for acquiring the running progress of the motor; and a control unit for controlling the rotor assembly to stop at a target position when the running progress is completed, and controlling two sets of windings to conduct so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole.

[0025] The second aspect of this invention provides a motor control device. The motor includes a rotor assembly and a stator assembly. The rotor assembly is located on one side of the stator assembly along the axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly and the stator assembly are separated, eliminating the need for a connecting shaft to transmit power between the parts connected to the rotor assembly and the parts connected to the stator assembly. This arrangement also reduces the axial thickness of the stator assembly and the rotor assembly, as well as the overall weight, thus reducing the overall height and weight of the household appliance and facilitating its storage and transportation. Users can store the parts with the stator assembly and the parts with the rotor assembly separately, improving storage and portability. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. When the windings are energized, they generate a magnetic field. The rotation of the rotor assembly is achieved through the interaction between the magnetic field generated by the windings and the magnetic field generated by the magnetic poles. The motor control device includes an acquisition unit and a control unit. The acquisition unit acquires the motor's running progress. When the motor's running progress is completed, the control unit controls the rotor assembly to stop at the target position and controls the two sets of windings to conduct, so that the magnetic fields generated by the two sets of windings are opposite in polarity to the corresponding magnetic poles. Thus, the magnetic fields generated by the windings and the magnetic fields generated by the corresponding magnetic poles repel each other, greatly reducing the axial magnetic pull between the stator assembly and the rotor assembly when the motor is stopped. This allows the rotor assembly to be easily lifted, making it easier to separate the parts connected to the rotor assembly from the parts connected to the stator assembly, and preventing the parts connected to the rotor assembly from shaking when the user lifts the rotor assembly with a large force.

[0026] According to a third aspect of the present invention, an electronic device is also provided, comprising: a memory storing a program or instructions; and a processor that, when executing the program or instructions, implements the steps of the motor control method as described in any of the above embodiments.

[0027] The electronic device provided in the third aspect of the present invention includes the steps of the motor control method proposed in any of the above embodiments, and therefore has all the beneficial effects of the motor control method, which will not be repeated here.

[0028] According to a fourth aspect of the invention, a readable storage medium is also provided, on which a program or instructions are stored, which, when executed, implement the steps of the motor control method as described in any of the above embodiments.

[0029] The readable storage medium provided in the fourth aspect of the present invention includes the steps of the motor control method proposed in any of the above embodiments, and therefore has all the beneficial effects of the motor control method, which will not be repeated here.

[0030] According to a fifth aspect of the present invention, a household appliance is also provided, comprising: a first body; a second body, the second body being mountable on the first body; a processing unit disposed on the second body; a motor including a stator assembly and a rotor assembly, the stator assembly being disposed on the first body, the rotor assembly being disposed on the second body and connected to the processing unit, the stator assembly being capable of driving the rotor assembly to rotate, thereby causing the rotor assembly to drive the processing unit to rotate, the rotor assembly being located on one side of the stator assembly along the axis of rotation of the rotor assembly, the stator assembly including three sets of windings, the rotor assembly including a plurality of magnetic poles; and a control device for the motor as described in the above embodiments; and / or a readable storage medium as described in the above embodiments.

[0031] The fifth aspect of this invention discloses a household appliance comprising a first body, a second body, a processing unit, and a motor. A stator assembly is disposed in the first body, and a rotor assembly is disposed in the second body. The stator assembly drives the rotor assembly to rotate, thereby causing the rotor assembly to drive rotating components. The rotor assembly is located on one side of the stator assembly along its axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly and the stator assembly are separated, eliminating the need for a connecting shaft between the second body and the first body to transmit power. This arrangement also reduces the axial thickness of the stator and rotor assemblies and the overall weight, thus reducing the overall height and weight of the household appliance, facilitating its storage and transportation. Users can store the first body with the stator assembly and the second body with the rotor assembly separately, improving storage and portability. Meanwhile, the household appliance also includes a motor control device or a readable storage medium, which can acquire the motor's running progress during the operation of the household appliance. When the motor's running progress is completed, the rotor assembly is controlled to stop at the target position, and the two sets of windings are controlled to conduct, so that the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole. Thus, the magnetic field generated by the windings and the magnetic field generated by the corresponding magnetic pole repel each other, greatly reducing the axial magnetic pull between the stator assembly and the rotor assembly when the motor is stopped. This allows the rotor assembly to be easily picked up, and also makes it easier to separate the second body from the first body, avoiding the situation where the part connected to the rotor assembly shakes when the user lifts the second body with a large force.

[0032] In some embodiments, the household appliance may optionally include a food processor, a first body including a base assembly, a second body including a cup assembly, the cup assembly being mountable on the base assembly, a processing unit including a blade located on the cup assembly, the blade including a shaft, and a rotor assembly sleeved on the shaft.

[0033] In this embodiment, the household appliance includes a food processor. Specifically, the first body includes a base assembly, the second body includes a cup assembly, and the rotating component includes a blade. The cup assembly is placed on the base assembly, and the blade rotates through the interaction between the stator assembly and the rotor assembly, thereby processing the food inside the cup assembly.

[0034] Alternatively, food processors include electric kettles, coffee makers, food processors, etc.

[0035] Optionally, when the household appliance includes a rice cooker, the first body includes a first pot body, the second body includes a second pot body, and the rotating component includes a stirring component. The second pot body is disposed within the first pot body to heat the food inside the second pot body. At least a portion of the stirring component extends into the second pot body to stir the food inside the second pot body, thereby improving the uniformity of heating and preventing scorching. When the household appliance includes a fan, the fan head and fan base can be separated for easy cleaning. Furthermore, when the fan head is mounted on the fan base, the stator assembly within the fan base drives the rotor assembly within the fan head to rotate, which in turn drives the fan blades to rotate, achieving the air delivery function.

[0036] In some embodiments, optionally, when the household appliance includes a food processor, the cup assembly includes: a cup body including a first cavity and a second cavity, a portion of the blade being disposed in the first cavity and another portion being located in the second cavity, a rotor assembly being disposed in the second cavity and connected to the blade; and a bottom cover sealing one end of the second cavity away from the first cavity.

[0037] In this embodiment, the cup assembly includes a cup body and a cup base. The cup base is disposed at one end of the cup body and together with the cup body, forms a cavity. A blade is disposed within the cavity, dividing the cavity into a first cavity and a second cavity. The first cavity is used to hold food ingredients, and the second cavity is used to hold components on the cup assembly. A portion of the blade is disposed within the first cavity, and another portion of the blade is disposed within the second cavity and connected to a rotor assembly within the second cavity. The rotor assembly then drives the blade to rotate, causing the blade to process the food ingredients within the first cavity.

[0038] In some embodiments, optionally, the magnetic field lines between the stator assembly and the rotor assembly point from the N pole of the stator assembly to the S pole of the rotor assembly along the axial direction of the rotor assembly, and from the N pole of the rotor assembly to the S pole of the stator assembly; the magnetic field lines inside the stator assembly point from the S pole of the stator assembly to the N pole of the stator assembly along the circumferential direction of the stator assembly, and the magnetic field lines inside the rotor assembly point from the S pole of the rotor assembly to the N pole of the rotor assembly along the circumferential direction of the rotor assembly.

[0039] In this embodiment, when the household appliance is turned on, the magnetic field lines inside the stator assembly point from the S pole to the N pole along the circumference of the stator assembly, causing the magnetic field of the stator assembly to rotate circumferentially. The N pole of the stator assembly generates a repulsive force on the N pole of the rotor assembly, and the S pole of the stator assembly generates an attractive force on the N pole of the rotor assembly. The electromagnetic forces acting on the N and S poles of the rotor assembly along the axial direction of the rotor assembly cancel each other out, and the resultant force is directed along the axial direction of the rotor assembly. The electromagnetic force in the circumferential direction means that when the magnetic field of the stator assembly rotates circumferentially, the rotor assembly also rotates in the same direction. Thus, under the action of the stator assembly, the rotor assembly rotates, and through the rotation of the rotor assembly, the processing unit rotates. In addition, through the magnetic field distribution of the stator assembly and the rotor assembly, the axial magnetic flux of the motor is realized, which allows the stator assembly and the rotor assembly to be set up separately along the axial direction. When storing, the user can store the part with the stator assembly and the part with the rotor assembly separately, improving the convenience of storage and carrying.

[0040] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0042] Figure 1 A flowchart of a motor control method according to an embodiment of the present invention is shown;

[0043] Figure 2 One of the structural schematic diagrams of a motor according to an embodiment of the present invention is shown;

[0044] Figure 3 A second schematic diagram of the structure of a motor according to an embodiment of the present invention is shown;

[0045] Figure 4 One of the graphs showing the relationship between rotor position angle and magnetic pull force according to an embodiment of the present invention is illustrated.

[0046] Figure 5 The third schematic diagram of the structure of a motor according to an embodiment of the present invention is shown;

[0047] Figure 6 This is the second diagram showing the relationship between the rotor position angle and the magnetic pull force according to an embodiment of the present invention;

[0048] Figure 7 A winding circuit diagram according to an embodiment of the present invention is shown;

[0049] Figure 8 One of the structural schematic diagrams of a food processor according to an embodiment of the present invention is shown;

[0050] Figure 9 A second schematic diagram of the structure of a food processor according to an embodiment of the present invention is shown;

[0051] Figure 10 One schematic diagram of a motor according to an embodiment of the present invention is shown;

[0052] Figure 11 A second schematic diagram of a motor according to an embodiment of the present invention is shown;

[0053] Figure 12 A schematic block diagram of a control device according to an embodiment of the present invention is shown;

[0054] Figure 13 A schematic block diagram of an electronic device according to an embodiment of the present invention is shown;

[0055] Figure 14 The fourth schematic diagram of the structure of a motor according to an embodiment of the present invention is shown.

[0056] The correspondence between the reference numerals and the component names is as follows:

[0057] 1 First body, 10 seat assembly, 2 Second body, 20 cup assembly, 3 Processing unit, 30 cutting tool, 4 Motor, 40 stator assembly, 400 winding, 42 rotor assembly, 420 magnetic poles. Detailed Implementation

[0058] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0060] The following reference Figures 1 to 14 This invention describes a method for controlling an electric motor, a control device, an electronic device, and a household appliance according to some embodiments of the present invention.

[0061] According to one embodiment of the present invention, a method for controlling a motor is proposed, wherein the motor is used in household appliances, such as... Figure 2 , Figure 3 and Figure 5As shown, the motor 4 includes a stator assembly 40 and a rotor assembly 42. Along the axis of rotation of the rotor assembly 42, the rotor assembly 42 is located on one side of the stator assembly 40. The stator assembly 40 includes three sets of windings 400, and the rotor assembly 42 includes multiple magnetic poles 420.

[0062] like Figure 1 The diagram shows a flowchart of a motor control method, which includes:

[0063] Step 502: Obtain the motor's running progress;

[0064] Step 504: When the running progress is completed, control the rotor assembly to stop at the target position and control the two sets of windings to conduct so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic poles.

[0065] The present invention provides a motor control method. The motor includes a rotor assembly and a stator assembly. The rotor assembly is located on one side of the stator assembly along the axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly and the stator assembly are separated, eliminating the need for a connecting shaft to transmit power between the parts connected to the rotor assembly and the parts connected to the stator assembly. This arrangement also reduces the axial thickness of the stator and rotor assemblies and the overall weight, thus facilitating the reduction of the overall height and weight of household appliances, making them easier to store and transport. Users can store the parts with the stator assembly and the parts with the rotor assembly separately, improving storage and portability. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. When the windings are energized, they generate a magnetic field. The rotation of the rotor assembly is achieved through the interaction between the magnetic field generated by the windings and the magnetic field generated by the magnetic poles. The motor control method includes acquiring the motor's running progress, controlling the rotor assembly to stop at the target position when the motor's running progress is completed, and controlling the two sets of windings to conduct, so that the magnetic fields generated by the two sets of windings are opposite in polarity to the corresponding magnetic poles. Thus, the magnetic fields generated by the windings and the magnetic fields generated by the corresponding magnetic poles repel each other, greatly reducing the axial magnetic pull between the stator assembly and the rotor assembly when the motor is stopped. This allows the rotor assembly to be easily lifted, making it easier to separate the parts connected to the rotor assembly from the parts connected to the stator assembly, and preventing the parts connected to the rotor assembly from shaking when the user lifts the rotor assembly with a large force.

[0066] In addition, by using the principle of axial magnetic flux coupling, the stator assembly and rotor assembly are set up separately, eliminating the need for a connecting shaft to transmit power and the need for a coupling to connect the shafts, thereby reducing the noise of the motor during operation.

[0067] Optionally, the stator assembly includes stator teeth and a stator core, with windings wound around the stator teeth. Optionally, there can be three or more sets of windings. Figure 2 and Figure 7 As shown, the three windings include: windings A1, A2, and A3 connected in series; windings B1, B2, and B3 connected in series; and windings C1, C2, and C3 connected in series. The stator teeth connected in series generate magnetic fields of the same polarity, and the sum of the currents in phases A, B, and C is 0. Therefore, at least two phase windings need to be kept conducting. Figure 7 In the diagram, S1, S2, S3, S4, S5, and S6 all represent power devices, U dc This indicates DC voltage.

[0068] Optionally, when there are three sets of windings, upon completion of the motor's running progress, the rotor assembly is stopped at the target position, and two sets of windings are turned on, so that the polarities of the magnetic fields generated by the two sets of windings are opposite to the polarities of their corresponding magnetic poles. Optionally, the magnetic poles include N poles and S poles.

[0069] Optionally, when the stator assembly includes three sets of windings: phase A, phase B, and phase C, the conduction relationship between the power devices and the windings is shown in Table 1:

[0070] Table 1

[0071] 1 + - 0 S1, S6 2 0 + - S3, S2 3 - 0 + S5, S4 4 - + 0 S3, S4 5 0 - + S5, S6 6 + 0 - S1, S2

[0072] In this circuit, "+" represents the positive direction, "-" represents the negative direction, and "0" represents no conduction. The positive direction is... Figure 2 The stator assembly shown is in a counter-clockwise direction.

[0073] It should be noted that in Table 1, serial number 1 means that when power devices S1 and S6 are turned on, phase A carries positive current, phase B carries negative current, and phase C carries no current. Serial numbers 2 to 6 are based on the same principle and will not be described again here.

[0074] It is understandable that, such as Figure 4 As shown, the magnetic pull between the rotor and stator assemblies changes with the position of the rotor assembly. Therefore, controlling the winding to conduct at the target position can reduce the magnetic pull between the stator and rotor assemblies.

[0075] Optionally, during the actual control of the motor, the rotor assembly can be controlled to stop at the target position by pre-positioning.

[0076] It is understandable that when the rotor assembly is in the target position, the magnetic pull between the stator assembly and the rotor assembly is minimized when the two sets of windings are turned on and a magnetic field opposite to the polarity of the corresponding magnetic poles is generated.

[0077] Optionally, the rotor assembly and the stator assembly are spaced apart along the axial direction of the rotor assembly.

[0078] Optionally, the axis of the rotor assembly is arranged parallel to the axis of the stator assembly in the axial direction.

[0079] Optionally, the axis of the rotor assembly coincides with the axis of the stator assembly in the axial direction, so that the stator assembly and the rotor assembly are arranged in parallel.

[0080] In some embodiments, optionally, the step of controlling the rotor assembly to stop at the target position and controlling the two sets of windings to conduct includes: controlling the rotor assembly to stop at the target position, determining the two sets of windings to be conducted according to the correspondence between the target position and the two sets of windings to be conducted, and finding the electrical parameter information of the two sets of windings to be conducted; controlling the two sets of windings to conduct according to the electrical parameter information; wherein, the electrical parameter information includes the current amplitude and current direction, and at the target position, the tension value between the stator assembly and the rotor assembly along the axial direction is less than or equal to the target tension value.

[0081] In this embodiment, the steps of controlling the rotor assembly to stop at the target position and controlling the two sets of windings to conduct include: controlling the rotor assembly to stop at the target position; then, determining the two sets of windings to be conducted based on the correspondence between the target position of the rotor assembly and the windings to be conducted; further determining the electrical parameter information of the two sets of windings to be conducted; and then controlling the two sets of windings to conduct according to the found electrical parameter information, so that the magnetic field generated by the two sets of windings is opposite in polarity to the magnetic field of the rotor assembly at the target position, thereby making the axial tension value between the stator assembly and the rotor assembly less than or equal to the target tension value, so that the user can lift the part connected to the rotor assembly. The electrical parameter information includes the current amplitude and current direction to ensure that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic poles.

[0082] Optionally, the target tension value is the minimum axial tension value between the rotor assembly and the stator assembly.

[0083] In some embodiments, optionally, before the step of obtaining the motor's running progress, the method further includes: storing the correspondence between the electrical parameter information of the two sets of windings that need to be turned on and the target position.

[0084] In this embodiment, the correspondence between the target position and the electrical parameters of the conducting winding is stored in advance, so that when the motor running progress ends, the rotor assembly is controlled to stop at the target position, and the winding is turned on according to the correspondence, making it easier to separate the stator assembly and the rotor assembly.

[0085] In some embodiments, optionally, the current directions of the two sets of windings corresponding to the target position are opposite, and the current amplitudes of the two sets of windings corresponding to the target position are the same.

[0086] In this embodiment, the currents in the two sets of windings corresponding to the target position are in opposite directions and have the same amplitude, causing the two sets of windings to repel each other from their corresponding magnetic poles. This makes it easier to separate the stator assembly and the rotor assembly when the motor operation ends. Simultaneously, this limitation also ensures that the two sets of windings form a closed loop, guaranteeing the reliability of the circuit.

[0087] In some embodiments, the target position may optionally include the rotor position angle θ of the rotor assembly, the angle value of the rotor position angle θ being equal to 20k°; wherein k is a natural number and k is less than or equal to 18.

[0088] In this embodiment, the target position includes the rotor position angle θ of the rotor assembly. Optionally, the rotor position angle θ is equal to 20k°, that is, the rotor position angle θ is 20 times any natural number from 0 to 18. At different rotor position angles θ, the windings that need to be turned on are different.

[0089] It should be noted that the rotor position angle θ refers to the electrical angle between the N pole of the rotor assembly and the A-phase winding of the stator assembly in space.

[0090] It is understandable that the magnetic pull between the rotor assembly and the stator assembly changes as the rotor position angle θ changes. For example... Figure 3 As shown, the motor is cut axially at winding A1 and laid out in a straight line. Figure 3 China F P F is the axial magnetic pull of the stator core (the stator assembly includes the stator core and stator teeth) on the permanent magnets of the rotor assembly. S F N These represent the axial magnetic pull forces exerted by the magnetic field generated by the energized winding on the S and N poles of the permanent magnet, respectively. A I B I C The currents (I) flowing through the windings of phases A, B, and C are respectively. A1 I B1 I C1 I represents the current flowing into phases A1, B1, and C1, respectively. C3 (This refers to the current flowing through phase C3). Now, we analyze the relationship between the rotor position angle θ and the magnetic pull F (magnetic pull F = F0) between the stator assembly and the rotor assembly under different conduction modes. P -F S -F N The relationship between ) and the result is as follows Figure 4 As shown, where, Figure 4The lines corresponding to "-0+" indicate that phase A is conducting in the negative direction, phase B is not conducting, and phase C is conducting in the positive direction. The lines corresponding to "0-+" indicate that phase A is not conducting, phase B is conducting in the negative direction, and phase C is conducting in the positive direction. The meanings of the other lines are similar and will not be repeated.

[0091] Optionally, when the stator assembly includes three sets of windings: phase A, phase B, and phase C, the correspondence between the rotor position angle θ and the winding conduction mode is shown in Table 2 below:

[0092] Table 2

[0093]

[0094] In this circuit, "+" represents the positive direction, "-" represents the negative direction, and "0" represents no conduction. The positive direction is... Figure 2 The stator assembly shown is in a counter-clockwise direction.

[0095] Optionally, for cases with different pole-slot combinations, the analysis is performed using a "unit motor". If the number of slots in the motor, Q1, and the number of pole pairs, p, have a greatest common divisor t, i.e., Q1 = Q0t and p = p0t, then:

[0096]

[0097] Among them, the motor with Q0 slots and p0 pole pairs is called a unit motor. The original motor consists of t identical unit motors. The number of slots Q0 and the number of pole pairs p0 of the fractional-slot unit motor cannot be arbitrarily chosen; they must satisfy the following:

[0098] 1) To achieve three-way symmetry, Q0 must be a multiple of 3, where n = (2k-1), and k is a positive integer;

[0099] 2) Q0 / p0 is an irreducible fraction, therefore p0 cannot be a multiple of 3;

[0100] 3) To ensure a high pitch factor for the winding, the following conditions must be met.

[0101] Based on the above conditions, the initial position of the unit motor under any pole slot combination is as follows: Figure 14 As shown.

[0102] It can be seen that when the conduction mode of phases A, B, and C is "+, -, 0", the axial magnetic pull is in To obtain the minimum value, and because the cyclic symmetry relationship is satisfied under each conduction condition, the correspondence between the rotor position angle θ and the winding conduction mode under any pole slot combination is shown in Table 3:

[0103] Table 3

[0104]

[0105] In this circuit, "+" represents the positive direction, "-" represents the negative direction, and "0" represents no conduction. The positive direction is... Figure 2 The stator assembly shown is in a counter-clockwise direction.

[0106] like Figure 12 As shown, according to one embodiment of the present invention, a motor control device 600 is also provided. The motor is used in household appliances. The motor includes a stator assembly and a rotor assembly. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. The control device 600 includes: an acquisition unit 602 for acquiring the running progress of the motor; and a control unit 604 for controlling the rotor assembly to stop at a target position when the running progress is completed, and controlling the two sets of windings to conduct so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole.

[0107] The present invention provides a motor control device 600. The motor includes a rotor assembly and a stator assembly. The rotor assembly is located on one side of the stator assembly along the axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly and the stator assembly are separated, eliminating the need for a connecting shaft to transmit power between the parts connected to the rotor assembly and the parts connected to the stator assembly. This arrangement also reduces the axial thickness of the stator assembly and the rotor assembly, as well as the overall weight, thus reducing the overall height and weight of the household appliance and facilitating its storage and transportation. Users can store the parts with the stator assembly and the parts with the rotor assembly separately, improving storage and portability. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. When the windings are energized, they generate a magnetic field, and the rotation of the rotor assembly is achieved through the interaction between the magnetic field generated by the windings and the magnetic field generated by the magnetic poles. The motor control device 600 includes an acquisition unit 602 and a control unit 604. The acquisition unit 602 is used to acquire the running progress of the motor. When the running progress of the motor is completed, the control unit 604 controls the rotor assembly to stop at the target position and controls the two sets of windings to conduct, so that the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole. Thus, the magnetic field generated by the windings and the magnetic field generated by the corresponding magnetic pole repel each other, which greatly reduces the axial magnetic pull between the stator assembly and the rotor assembly when the motor is stopped. This makes the rotor assembly easy to pick up, and makes it easier to separate the part connected to the rotor assembly from the part connected to the stator assembly. This avoids the situation where the part connected to the rotor assembly shakes when the user lifts the rotor assembly with a large force.

[0108] Optionally, the stator assembly includes stator teeth and a stator core, with windings wound around the stator teeth. Optionally, there can be three or more sets of windings. Figure 2 and Figure 7 As shown, the three windings include: windings A1, A2, and A3 connected in series; windings B1, B2, and B3 connected in series; and windings C1, C2, and C3 connected in series. The stator teeth connected in series generate magnetic fields of the same polarity, and the sum of the currents in phases A, B, and C is 0. Therefore, at least two phase windings need to be kept conducting. Figure 7 In the diagram, S1, S2, S3, S4, S5, and S6 all represent power devices, U dc This indicates DC voltage.

[0109] Optionally, when there are three sets of windings, upon completion of the motor's running progress, the rotor assembly is stopped at the target position, and two sets of windings are turned on, so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic poles. Optionally, the magnetic poles include N poles and S poles.

[0110] Optionally, when the stator assembly includes three sets of windings: phase A, phase B, and phase C, the conduction relationship between the power devices and the windings is shown in Table 1 above.

[0111] It is understandable that, such as Figure 4 As shown, the magnetic pull between the rotor and stator assemblies changes with the position of the rotor assembly. Therefore, controlling the winding to conduct at the target position can reduce the magnetic pull between the stator and rotor assemblies.

[0112] Optionally, during the actual control of the motor, the rotor assembly can be controlled to stop at the target position by pre-positioning.

[0113] It is understandable that when the rotor assembly is in the target position, the magnetic pull between the stator assembly and the rotor assembly is minimized when the two sets of windings are turned on and a magnetic field opposite to the polarity of the corresponding magnetic poles is generated.

[0114] In some embodiments, optionally, the control device 600 further includes a storage unit 606, which is used to store the correspondence between the electrical parameter information of the two sets of windings that need to be turned on and the target position before the acquisition unit 602 acquires the running progress of the motor.

[0115] In this embodiment, the correspondence between the target position and the electrical parameters of the conducting winding is stored in advance, so that when the motor running progress ends, the rotor assembly is controlled to stop at the target position, and the winding is turned on according to the correspondence, making it easier to separate the stator assembly and the rotor assembly.

[0116] Optionally, when the stator assembly includes three sets of windings: phase A, phase B, and phase C, the conduction relationship between the power devices and the windings is shown in Table 1 above.

[0117] In some embodiments, optionally, the current directions of the two sets of windings corresponding to the target position are opposite, and the current amplitudes of the two sets of windings corresponding to the target position are the same.

[0118] In this embodiment, the currents in the two sets of windings corresponding to the target position are in opposite directions but have the same amplitude, causing the two sets of windings to repel each other from their corresponding magnetic poles. This makes it easier to separate the stator assembly and rotor assembly when the motor operation ends. Simultaneously, this limitation also ensures that the two sets of windings form a closed loop, guaranteeing the reliability of the circuit.

[0119] In some embodiments, the target position may optionally include the rotor position angle of the rotor assembly, the angle value of which is equal to 20k°; where k is a natural number and k is less than or equal to 18.

[0120] In this embodiment, the target position includes the rotor position angle of the rotor assembly. Optionally, the angle value of the rotor position angle is equal to 20k°, that is, the rotor position angle is 20 times any natural number from 0 to 18. At different rotor position angles, the corresponding windings that need to be turned on are different.

[0121] It should be noted that the rotor position angle refers to the electrical angle between the N-pole of the rotor assembly and the A-phase winding of the stator assembly in space.

[0122] Optionally, when the stator assembly includes three sets of windings: phase A, phase B, and phase C, the correspondence between the rotor position angle and the winding conduction mode is shown in Table 2 above.

[0123] like Figure 13 As shown, according to one embodiment of the present invention, an electronic device 700 is also provided, comprising: a memory 704 storing a program or instructions; and a processor 702, which, when executing the program or instructions, implements the steps of the motor control method proposed in any of the above embodiments.

[0124] The electronic device 700 provided by the present invention includes the steps of the motor control method proposed in any of the above embodiments, and therefore has all the beneficial effects of the motor control method, which will not be repeated here.

[0125] According to one embodiment of the present invention, a readable storage medium is also provided, on which a program or instructions are stored, which, when executed, implement the steps of the motor control method as proposed in any of the above embodiments.

[0126] The readable storage medium provided by the present invention includes the steps of the motor control method proposed in any of the above embodiments, and therefore has all the beneficial effects of the motor control method, which will not be repeated here.

[0127] like Figure 2 , Figure 5 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, according to one embodiment of the present invention, a household appliance is also provided, comprising: a first body 1; a second body 2, the second body 2 being mountable on the first body 1; a processing unit 3, the processing unit 3 being disposed on the second body 2; a motor 4, including a stator assembly 40 and a rotor assembly 42, the stator assembly 40 being disposed on the first body 1, the rotor assembly 42 being disposed on the second body 2 and connected to the processing unit 3, the stator assembly 40 being capable of driving the rotor assembly 42 to rotate, so that the rotor assembly 42 drives the processing unit 3 to rotate, the rotor assembly 42 being located on one side of the stator assembly 40 along the axis of rotation of the rotor assembly 42, the stator assembly 40 including three sets of windings 400, the rotor assembly 42 including a plurality of magnetic poles 420; a control device for the motor 4 as described in the above embodiment; and / or a readable storage medium as described in the above embodiment.

[0128] The household appliance proposed in this invention includes a first body 1, a second body 2, a processing unit 3, and a motor 4. A stator assembly 40 is disposed on the first body 1, and a rotor assembly 42 is disposed on the second body 2. The stator assembly 40 can drive the rotor assembly 42 to rotate, so that the rotor assembly 42 drives the rotating parts to rotate. The rotor assembly 42 is located on one side of the stator assembly 40 along the axial direction. Through the principle of axial magnetic flux coupling, the rotor assembly 42 and the stator assembly 40 are separated, so that the second body 2 and the first body 1 do not need to be connected by a shaft to transmit power. At the same time, this arrangement can also reduce the thickness of the stator assembly 40 and the rotor assembly 42 along the axial direction and the overall weight, thereby helping to reduce the overall height and weight of the household appliance, making it easier to store and transport. When storing, the user can store the first body 1 with the stator assembly 40 and the second body 2 with the rotor assembly 42 separately, improving the convenience of storage and carrying. Meanwhile, the household appliance also includes a control device or readable storage medium for the motor 4, enabling the acquisition of the motor 4's running progress during operation. When the motor 4 completes its running progress, the rotor assembly 42 is stopped at the target position, and the two sets of windings 400 are connected, making the magnetic field generated by the two sets of windings 400 opposite in polarity to the corresponding magnetic poles 420. This repulsion between the magnetic field generated by the windings 400 and the corresponding magnetic poles 420 significantly reduces the axial magnetic pull between the stator assembly 40 and the rotor assembly 42 when the motor 4 is stopped, allowing the rotor assembly 42 to be easily lifted. This also makes it easier to separate the second body 2 from the first body 1, preventing the part connected to the rotor assembly 42 from shaking when the user lifts the second body 2 with excessive force. Furthermore, by separating the stator assembly 40 and the rotor assembly 42 through the principle of axial magnetic flux coupling, there is no need for a connecting shaft to pass through the second body 2 for power transmission, ensuring the sealing of the second body 2. Furthermore, there is no need for a coupling to connect the shafts, thereby reducing noise during the operation of the household appliance.

[0129] Optionally, the rotor assembly 42 and the stator assembly 40 are spaced apart along the axial direction of the rotor assembly 42.

[0130] Optionally, the axis L1 of the rotor assembly 42 is arranged parallel to the axis L2 of the stator assembly 40 in the axial direction.

[0131] Optionally, the axis L1 of the rotor assembly 42 coincides with the axis L2 of the stator assembly 40 in the axial direction, so that the stator assembly 40 and the rotor assembly 42 are arranged in parallel.

[0132] In some embodiments, optionally, the household appliance includes a food processor, a first body 1 including a base assembly 10, a second body 2 including a cup assembly 20, the cup assembly 20 being mountable to the base assembly 10, and a processing unit 3 including a blade 30 located on the cup assembly 20, the blade 30 including a rotating shaft, and a rotor assembly 42 sleeved on the rotating shaft; or the household appliance includes a rice cooker, a first body 1 including a first pot body, a second body 2 including a second pot body, the second pot body being disposed within the first pot body, and a processing unit 3 including a stirring member, at least a portion of which extends into the second pot body, and a heating plate located at the bottom of the second pot body; or the household appliance includes a fan, a first body 1 including a fan base, a second body 2 including a fan head, the fan head being mountable to the fan base, and a processing unit 3 including fan blades disposed on the fan head and capable of rotating relative to the fan head.

[0133] In this embodiment, the household appliance includes a food processor. Specifically, the first body 1 includes a base assembly 10, the second body 2 includes a cup assembly 20, and the rotating component includes a blade 30. The cup assembly 20 is placed on the base assembly, and the blade 30 is rotated through the interaction between the stator assembly 40 and the rotor assembly 42, thereby processing the food inside the cup assembly 20.

[0134] Alternatively, food processors include electric kettles, coffee makers, food processors, etc.

[0135] Optionally, when the household appliance includes a rice cooker, the first body 1 includes a first pot body, the second body 2 includes a second pot body, and the rotating component includes a stirring component. The second pot body is disposed inside the first pot body to heat the food inside the second pot body. At least a portion of the stirring component extends into the second pot body to stir the food inside the second pot body, thereby improving the uniformity of heating of the food inside the second pot body and preventing scorching. When the household appliance includes a fan, the fan head and the fan base can be separated, which facilitates cleaning of the fan head. Furthermore, when the fan head is installed in the fan base, the stator assembly 40 in the fan base drives the rotor assembly 42 in the fan head to rotate, and the rotor assembly 42 drives the fan blades to rotate, thereby achieving the air delivery function.

[0136] In some embodiments, optionally, when the household appliance includes a food processor, the cup assembly 20 includes: a cup body including a first cavity and a second cavity, a portion of the blade 30 being disposed in the first cavity and another portion being located in the second cavity, a rotor assembly 42 being disposed in the second cavity and connected to the blade 30; and a bottom cover covering one end of the second cavity away from the first cavity.

[0137] In this embodiment, the cup assembly 20 includes a cup body and a cup base. The cup base is disposed at one end of the cup body and together with the cup body, forms a cavity. A blade 30 is disposed within the cavity, dividing the cavity into a first cavity and a second cavity. The first cavity is used to hold food ingredients, and the second cavity is used to hold components on the cup assembly 20. A portion of the blade 30 is disposed within the first cavity, and another portion of the blade 30 is disposed within the second cavity and connected to a rotor assembly 42 within the second cavity. The rotor assembly 42 then drives the blade 30 to rotate, causing the blade 30 to process the food ingredients within the first cavity.

[0138] In some embodiments, optionally, the magnetic field lines between the stator assembly 40 and the rotor assembly 42 point from the N pole of the stator assembly 40 to the S pole of the rotor assembly 42 along the axial direction of the rotor assembly 42, and from the N pole of the rotor assembly 42 to the S pole of the stator assembly 40; the magnetic field lines inside the stator assembly 40 point from the S pole of the stator assembly 40 to the N pole of the stator assembly 40 along the circumferential direction of the stator assembly 40, and the magnetic field lines inside the rotor assembly 42 point from the S pole of the rotor assembly 42 to the N pole of the rotor assembly 42 along the circumferential direction of the rotor assembly 42.

[0139] In this embodiment, when the household appliance is turned on, the magnetic field lines inside the stator assembly 40 move circumferentially from the S pole of the stator assembly 40 to the N pole of the stator assembly 40, causing the magnetic field of the stator assembly 40 to rotate circumferentially. The N pole of the stator assembly 40 generates a repulsive force on the N pole of the rotor assembly 42, and the S pole of the stator assembly 40 generates an attractive force on the N pole of the rotor assembly 42. The S pole of the stator assembly 40 generates a repulsive force on the N pole of the rotor assembly 42, and the N pole of the stator assembly 40 generates an attractive force on the S pole of the rotor assembly 42. The electromagnetic forces acting on the N and S poles of the rotor assembly 42 along the axial direction of the rotor assembly 42 cancel each other out, and the resultant force... The electromagnetic force is circumferential. Therefore, when the magnetic field of the stator assembly 40 rotates circumferentially, the rotor assembly 42 will also rotate in the same direction. Thus, under the action of the stator assembly 40, the rotor assembly 42 is rotated. Through the rotation of the rotor assembly 42, the processing unit 3 is rotated. In addition, through the magnetic field distribution of the stator assembly 40 and the rotor assembly 42, the axial magnetic flux of the motor 4 is realized. Thus, the stator assembly 40 and the rotor assembly 42 can be separated axially. When storing, the user can store the part with the stator assembly 40 and the part with the rotor assembly 42 separately, improving the convenience of storage and carrying.

[0140] Understandably, the stator assembly 40 has a winding 400, which rotates circumferentially due to the magnetic field generated by the three-phase alternating current flowing through the winding 400.

[0141] Optionally, when the magnetic field of the stator assembly 40 rotates circumferentially, the rotor assembly 42 will also rotate in the same direction and at the same speed.

[0142] It is understandable that, such as Figure 11 As shown, the stator assembly 40 has multiple N poles (e.g., N pole ① and N pole ②) and multiple S poles. Specifically, the arrows indicate the direction of the resultant force of the magnetic field lines. The N pole ① of the stator assembly 40 and the N pole of the rotor assembly 42 generate a repulsive force. The S pole of the stator assembly 40 generates an attractive force and a repulsive force on the N pole and S pole of the rotor assembly 42, respectively. The N pole ② of the stator assembly 40 generates an attractive force on the S pole of the rotor assembly 42. The axial electromagnetic forces on the N pole and S pole of the rotor assembly 42 cancel each other out, and the resultant force is only the electromagnetic force in the circumferential direction. Therefore, when the magnetic field of the stator assembly 40 rotates in the circumferential direction, the rotor assembly 42 will also rotate in the same direction and at the same speed.

[0143] Optionally, the stator assembly 40 includes a winding 400, and the rotor assembly 42 includes a permanent magnet. The magnetic flux of the permanent magnet is axial. The magnetic field of the winding 400 interacts with the magnetic field of the permanent magnet to generate torque, thereby driving the rotor assembly 42 to rotate.

[0144] Optionally, the stator assembly 40 and the rotor assembly 42 are disc-shaped.

[0145] It is understandable that the second body 2 is detachably connected to the first body 1.

[0146] According to one embodiment of this application, by passing a suitable DC current (amplitude and direction) through the winding 400 of each phase stator assembly 40, a magnetic field with the opposite polarity to the permanent magnet of the rotor assembly 42 is generated, thereby reducing the unilateral magnetic pull between the stator assembly 40 and the rotor assembly 42. The control scheme will be described in detail below.

[0147] like Figure 2 and Figure 7 As shown, the three-phase inverter structure includes: windings A1, A2, and A3 connected in series; windings B1, B2, and B3 connected in series; and windings C1, C2, and C3 connected in series. The stator teeth generate magnetic fields of the same polarity, and the sum of the currents in phases A, B, and C is zero. Therefore, at least two phase windings (40° each) need to remain conducting. a e b e c Indicates voltage.

[0148] When only two phase windings 400 remain conducting, it can be known that the current amplitudes of the two phase windings 400 are equal and the directions are opposite, so there are a total of six conduction modes, as shown in Table 1 above.

[0149] Cut the winding along the axial direction at A1 and spread it into a straight line, as follows: Figure 3 As shown, Figure 3 China F PF is the axial magnetic pull of the stator core (stator assembly 40 includes stator core and stator teeth) on the permanent magnet of rotor assembly 42. S F N These represent the axial magnetic pull forces exerted by the magnetic field generated by the energized winding 400 on the S and N poles of the permanent magnet, respectively. A I B I C The currents (I) flowing through the windings of phases A, B, and C are respectively. A1 I B1 I C1 I represents the current flowing into phases A1, B1, and C1, respectively. C3 (This refers to the current flowing through phase C3). Now, we analyze the magnetic pull F (magnetic pull F = F0) between the rotor position angle θ and the stator assembly 40 and the rotor assembly 42 under different conduction modes. P -F S -F N The relationship between ) and the result is as follows Figure 4 As shown.

[0150] For any conduction mode, there are always certain position angles that minimize the magnetic pull between the stator assembly 40 and the rotor assembly 42. The specific corresponding positions and power device conduction modes are shown in Table 2 above.

[0151] In the actual control of motor 4, the stopping position of rotor assembly 42 of motor 4 can be controlled by pre-positioning. Therefore, rotor assembly 42 can be controlled to always stop at the rotor position angle shown in Table 2 above, and the corresponding switching device can be turned on, which can effectively reduce the axial magnetic pull between stator assembly 40 and rotor assembly 42. The above analysis will be verified by simulation next.

[0152] Optionally, such as Figure 5 As shown, the 6-pole 9-slot single-stator single-rotor axial flux motor analyzed above is used as an example for verification.

[0153] Figure 6 The variation of the axial magnetic pull between the stator assembly 40 and the rotor assembly 42 with the rotor position angle θ of the rotor assembly 42 under different conduction modes is presented, which is consistent with the results of the theoretical analysis above. This indicates that the proposed scheme can effectively reduce the axial magnetic pull between the stator assembly 40 and the rotor assembly 42. Figure 6 The lines corresponding to "+-0" indicate that the conduction direction of phase A is positive, the conduction direction of phase B is negative, and phase C is not conducting. The lines corresponding to "0+-" indicate that phase A is not conducting, phase B is conducting in a positive direction, and phase C is conducting in a negative direction. The meanings of the other lines are similar and will not be repeated.

[0154] This application utilizes the winding 400 of the stator assembly 40 of the motor 4 itself. By applying an appropriate current at a suitable position, the stator assembly 40 generates a magnetic field with the opposite polarity to the permanent magnet of the rotor assembly 42 to counteract the unilateral magnetic pull between the stator assembly 40 and the rotor assembly 42. This scheme has a simple control method and does not require additional costs.

[0155] Optionally, after the motor 4 stops, the rotor assembly 42 of the motor 4 can be stopped at a fixed rotor position angle (θ = 20k°, k ∈ n, n is a natural number, where k ≤ 18) by pre-positioning. By applying an appropriate current at this fixed position, the axial magnetic pull between the stator assembly 40 and the rotor assembly 42 can be effectively reduced.

[0156] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "linked" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0157] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0158] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling an electric motor, characterized in that, The motor is used in household appliances. The motor includes a stator assembly and a rotor assembly. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings. The rotor assembly includes multiple magnetic poles. The control method includes: Obtain the running progress of the motor; When the operation progress is completed, the rotor assembly is stopped at the target position, and the two sets of windings are turned on so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic pole.

2. The motor control method according to claim 1, characterized in that, The steps of controlling the rotor assembly to stop at the target position and controlling the two sets of windings to conduct include: The rotor assembly is controlled to stop at the target position. The two sets of windings that need to be turned on are determined according to the correspondence between the target position and the two sets of windings that need to be turned on. The electrical parameter information of the two sets of windings that need to be turned on is then retrieved. Control the two sets of windings to conduct according to the electrical parameter information; The electrical parameter information includes current amplitude and current direction. At the target position, the tension value between the stator assembly and the rotor assembly along the axial direction is less than or equal to the target tension value.

3. The motor control method according to claim 2, characterized in that, Before the step of obtaining the running progress of the motor, the method further includes: The correspondence between the electrical parameter information of the two sets of windings that need to be turned on and the target position is stored.

4. The motor control method according to claim 2, characterized in that, The current directions of the two sets of windings corresponding to the target position are opposite, and the current amplitudes of the two sets of windings corresponding to the target position are the same.

5. The motor control method according to any one of claims 1 to 4, characterized in that, The target position includes the rotor position angle of the rotor assembly, and the angle value of the rotor position angle is equal to 20k°; Where k is a natural number and k is less than or equal to 18.

6. A control device for an electric motor, characterized in that, The motor is used in household appliances. The motor includes a stator assembly and a rotor assembly. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings. The rotor assembly includes multiple magnetic poles. The control device includes: An acquisition unit is used to acquire the running progress of the motor; The control unit is configured to, upon completion of the running progress, control the rotor assembly to stop at the target position and control the two sets of windings to conduct so that the polarity of the magnetic field generated by the two sets of windings is opposite to the polarity of the corresponding magnetic poles.

7. An electronic device, characterized in that, include: A memory that stores programs or instructions; A processor, which, when executing the program or the instructions, implements the steps of the motor control method as described in any one of claims 1 to 5.

8. A readable storage medium, characterized in that, It stores a program or instructions, which, when executed, implement the steps of the motor control method as described in any one of claims 1 to 5.

9. A household appliance, characterized in that, include: first ontology; A second body, which can be installed on the first body; The processing unit is disposed in the second body; An electric motor includes a stator assembly and a rotor assembly. The stator assembly is disposed on a first body, and the rotor assembly is disposed on a second body and connected to the processing unit. The stator assembly is capable of driving the rotor assembly to rotate, thereby causing the rotor assembly to drive the processing unit to rotate. Along the axis of rotation of the rotor assembly, the rotor assembly is located on one side of the stator assembly. The stator assembly includes three sets of windings, and the rotor assembly includes multiple magnetic poles. The motor control device as claimed in claim 6; and / or the readable storage medium as claimed in claim 8.

10. The household appliance according to claim 9, characterized in that, The household appliance includes a food processor. The first body includes a base assembly, and the second body includes a cup assembly. The cup assembly can be mounted on the base assembly. The processing unit includes a blade located on the cup assembly. The blade includes a rotating shaft, and a rotor assembly is sleeved on the rotating shaft.

11. The household appliance according to claim 9, characterized in that, The magnetic field lines between the stator assembly and the rotor assembly point from the N pole of the stator assembly to the S pole of the rotor assembly along the axial direction of the rotor assembly. The magnetic field lines inside the stator assembly point from the S pole to the N pole of the stator assembly along the circumference of the stator assembly, and the magnetic field lines inside the rotor assembly point from the S pole to the N pole of the rotor assembly along the circumference of the rotor assembly.

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