Knob and control method thereof

Abstract

The invention relates to the technical field of knobs, in particular to a knob and a control method thereof. The knob comprises a control circuit board, a mode switching device, a position detection device, a brushless motor, a rotary support, a display screen device and a rotary shell. The brushless motor comprises a stator and a rotor located in the stator. The stator is elastically connected with the control circuit board; a mode switching device is arranged between the stator and the control circuit board; a position detection device is arranged in the rotor and is used for detecting the rotation condition of the rotor; the end, away from the control circuit board, of the rotor is connected with one side of the rotating support, the other side of the rotating support is connected with the rotating shell to form a containing cavity, and a display screen device is arranged in the containing cavity. Therefore, the knob is simple in structure, high in reliability and capable of achieving various knob hand feelings.

Description

Technical Field

[0001] The present invention relates to the technical field of knobs, and in particular to a knob and a control method thereof. Background Art

[0002] At present, most of the knobs are based on potentiometric encoder knobs, and their core component is the potentiometric encoder. The potentiometric encoder is essentially an adjustable resistor that can be precisely adjusted. It consists of a fixed resistor track, contacts, encoders, etc. Among them, the fixed resistor track is a thin and long resistor line made of conductive material, usually arranged in a spiral or straight line on an insulating substrate; the movable contact is a metal sheet tangent to the track, which can change the resistance value when rotating; the encoder is a component that can encode the rotation track. Usually, a set of fixed guide pins is provided on the interface. When the potentiometric encoder is rotated, the contacts move along the resistor track and connect to the resistor track at different positions to generate different resistance value outputs. The encoder can record the rotation angle or position and convert it into a digital signal output for outputting the encoding signal. However, due to its simple structure, there will be obvious hysteresis and ratchet feeling when rotating the knob, and this encoder can realize very few functions, cannot be programmed, and cannot meet the diverse needs of customers. Moreover, it is easily affected by the environment (such as dust, humidity, temperature and vibration, etc.), and its reliability is poor. Summary of the invention

[0003] To solve the above technical problems, the present application discloses, on one hand, a knob, which includes a control circuit board, a mode switching device, a position detection device, a brushless motor, a rotating bracket, a display device and a rotating housing;

[0004] The brushless motor comprises a stator and a rotor located inside the stator; the stator is elastically connected to the control circuit board; and the mode switching device is provided between the stator and the control circuit board;

[0005] The position detection device is provided in the rotor, and the position detection device is used to detect the rotation of the rotor;

[0006] One end of the rotor away from the control circuit board is connected to one side of the rotating bracket, and the other side of the rotating bracket is connected to the rotating shell to form a receiving cavity, and the display screen device is arranged in the receiving cavity.

[0007] Optionally, a support structure is also included;

[0008] The support structure includes a base and a support shaft;

[0009] One end of the support shaft is connected to the base, and the other end of the support shaft is provided with the position detection device and extends deep into the rotor;

[0010] One side of the base is fixedly connected to the stator, and the other side of the base is elastically connected to the control circuit board;

[0011] The mode switching device is arranged on the circuit board.

[0012] Optionally, a mounting hole is provided in the middle of the rotating bracket, and a diameter of the mounting hole is less than or equal to a diameter of the rotor.

[0013] Optionally, the display screen device includes a support, a display screen control module and a liquid crystal display screen;

[0014] One end of the support member is connected to the rotating bracket through the mounting hole, and the other end of the support member is provided with the display screen control module;

[0015] The display screen control module is electrically connected to the liquid crystal display screen.

[0016] Optionally, the rotating housing includes a cylindrical structure and a transparent protective shell;

[0017] One end of the cylindrical structure is fixedly connected to the rotating bracket, and the other end of the cylindrical structure is covered with the transparent protective shell.

[0018] Optionally, the mode switching device includes a pressure sensor or a touch switch;

[0019] The position detection device includes a magnetic sensor or a detection resistor, and the detection resistor is arranged at the tail end of the coil of the stator.

[0020] The present application discloses, on the other hand, a method for controlling a knob, which is applied to the above-mentioned knob, and the method comprises:

[0021] Determining the rotation mode of the knob using the mode switching device;

[0022] Acquiring the rotational position of the rotor detected by the position detection device;

[0023] The stator of the brushless motor is controlled to operate based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field, thereby controlling the rotor to rotate in a target direction.

[0024] Optionally, the determining the rotation mode of the knob by using the mode switching device includes:

[0025] Acquiring a voltage signal sent by the mode switching device;

[0026] When the voltage value corresponding to the voltage signal is greater than or equal to the preset voltage value, the current rotation mode of the knob is switched to another rotation mode and displayed on the liquid crystal display screen of the display screen device.

[0027] Optionally, the rotation mode of the knob includes a smooth mode and a damping mode;

[0028] When the rotation mode of the knob is a smooth mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes:

[0029] Determining a target switch corresponding to a target coil group of the stator based on a rotational position of the rotor;

[0030] Controlling the target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob;

[0031] When the rotation mode of the knob is a damping mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes:

[0032] Determining a target switch corresponding to a target coil group of the stator based on a rotational position of the rotor;

[0033] The target switch is controlled to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob.

[0034] Optionally, the rotation mode of the knob further includes a ratchet mode, a boundary mode and an automatic rotation mode;

[0035] When the rotation mode of the knob is a ratchet mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes:

[0036] determining a first target switch corresponding to a first target coil group of the stator based on a rotational position of the rotor;

[0037] Controlling the first target switch to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob;

[0038] When the rotor rotates to a preset setback position, determining a second target switch corresponding to a second target coil group of the stator;

[0039] Controlling the second target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob;

[0040] When the rotation mode of the knob is a boundary mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes:

[0041] When the rotation position of the rotor exceeds a preset boundary position, controlling the rotor to return to the preset boundary position by controlling the closing of a target switch of a target coil group of the stator;

[0042] When the rotation mode of the knob is the automatic rotation mode, the stator of the brushless motor is controlled to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction, including:

[0043] Taking the rotation position of the rotor as the initial position, the on / off states of the switches of the multiple groups of coils of the stator are controlled in a preset sequence to control the rotor to rotate in a preset direction.

[0044] The knob provided in the embodiment of the present application includes a control circuit board, a mode switching device, a position detection device, a brushless motor, a rotating bracket, a display device and a rotating shell; the brushless motor includes a stator and a rotor located in the stator; the stator is elastically connected to the control circuit board; and the mode switching device is provided between the stator and the control circuit board; the position detection device is provided in the rotor, and the position detection device is used to detect the rotation of the rotor; one end of the rotor away from the control circuit board is connected to one side of the rotating bracket, and the other side of the rotating bracket is connected to the rotating shell to form a receiving cavity, and the display device is provided in the receiving cavity. As a result, the knob is not only simple in structure, but also highly reliable, and can achieve a variety of knob feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 is a schematic diagram of the structure of an exemplary knob of the present application;

[0047] Figure 2 is an exploded view of an exemplary knob of the present application;

[0048] Figure 3is a schematic diagram of a connection of a stator coil exemplarily used in the present application;

[0049] Figure 4 is a flowchart of an exemplary method for controlling a knob of the present application;

[0050] Figure 5 This is an exemplary schematic diagram of the knob rotation in ratchet mode of the present application.

[0051] The following is a supplementary description of the attached drawings:

[0052] 1-control circuit board; 2-mode switching device; 3-position detection device; 4-brushless motor; 401-stator; 402-rotor; 5-rotating bracket; 6-display device; 601-support; 602-display control module; 603-liquid crystal display; 7-rotating shell; 701-cylindrical structure; 702-transparent protective shell; 8-support structure; 801-base; 802-support shaft; 9-light-emitting member; 10-buzzer. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0055] When a numerical range is disclosed herein, the above range is deemed to be continuous and includes the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. For example, a specified range from "1 to 10" should be deemed to include any and all sub-ranges between a minimum of 1 and a maximum of 10. Exemplary sub-ranges of ranges 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0056] See also Figure 1 , which is a schematic diagram of the structure of an exemplary knob of the present application. The knob includes a control circuit board 1, a mode switching device 2, a position detection device 3, a brushless motor 4, a rotating bracket 5, a display device 6 and a rotating shell 7; the brushless motor 4 includes a stator 401 and a rotor 402 located in the stator 401; the stator 401 is elastically connected to the control circuit board 1; and the mode switching device 2 is provided between the stator 401 and the control circuit board 1; the position detection device 3 is provided in the rotor 402, and the position detection device 3 is used to detect the rotation of the rotor 402; one end of the rotor 402 away from the control circuit board 1 is connected to one side of the rotating bracket 5, and the other side of the rotating bracket 5 is connected to the rotating shell 7 to form a receiving cavity, and the display device 6 is provided in the receiving cavity.

[0057] Through the cooperation of the above-mentioned mode switching device 2, position detection device 3 and brushless motor 4, not only the structure based on magnetic signals to realize knob rotation will not be affected by dust, moisture, high temperature and vibration, and has higher reliability, but also the brushless motor 4 and mode switching device 2 can be controlled by programming to realize different tactile sensations (force feedback) and functions.

[0058] In an exemplary embodiment, see Figure 2, which shows an exploded view of an exemplary knob of the present application. The knob also includes a support structure 8; the support structure 8 includes a base 801 and a support shaft 802; one end of the support shaft 802 is connected to the base 801, and the other end of the support shaft 802 is provided with the position detection device 3, and penetrates into the rotor 402; one side of the base 801 is fixedly connected to the stator 401, and the other side of the base 801 is elastically connected to the control circuit board 1; the mode switching device 2 is arranged on the circuit board. Specifically, the base 801 is connected to the control circuit board 1 through a spring member, so that when the user presses down on the knob housing, the brushless electrode and the support structure 8 will be driven to move downward, and the base 801 will contact the mode switching device 2 to trigger the switching of the rotation mode. In different rotation modes, different rotation feel can be achieved.

[0059] For example, the stator 401 and the rotor 402 in the brushless motor 4 can be connected by bearings, and multiple sets of coils can be arranged on the stator 401. Specifically, the connection method of the multiple sets of coils can be a three-phase winding star connection method (such as Figure 3 As shown), the entire stator 401 leads to three wires A, B, and C. When they are powered on in pairs, there are six situations, namely AB, AC, BC, BA, CA, and CB. Specifically, any one of the above two-way power supply can be selected in turn by controlling the six switches Q1, Q2, Q3, Q4, Q5, and Q6, that is, closing the corresponding switches, thereby realizing directional control of the magnetic field, so that the motor can rotate in any direction, at any speed, and to any angle, and the position feedback of the position detection device 3 can accurately obtain the initial and final position information of the knob. Since the rotor 402 is connected to the rotating housing 7, it can also apply force to the outside to form different hand feelings. Optionally, the connection method of the coil on the stator 401 in the brushless motor 4 can also be other types, such as a triangle connection.

[0060] In an exemplary embodiment, a mounting hole is provided in the middle of the rotating bracket 5, and the diameter of the mounting hole is less than or equal to the diameter of the rotor 402. Optionally, the rotating bracket 5 may be in a circular shape, and the diameter of the mounting hole may be less than the diameter of the rotor 402. Subsequently, a through hole is provided on the rotating bracket 5, and a fixing member (such as a screw, a bolt, etc.) is passed through the through hole to fix the rotating bracket 5 to the rotor 402. Optionally, the diameter of the mounting hole may be equal to the diameter of the rotor 402. The mounting hole may also be sleeved on the rotor 402, and the two are connected by a connecting member.

[0061] In an exemplary embodiment, the display screen device 6 includes a support member 601, a display screen control module 602 and a liquid crystal display screen 603; one end of the support member 601 is connected to the rotating bracket 5 through the mounting hole, and the other end of the support member 601 is provided with the display screen control module 602; the display screen control module 602 is electrically connected to the liquid crystal display screen 603. Optionally, the support member 601 can be specifically a cylindrical structure, one end of the support member 601 can be inserted into the mounting hole of the rotating bracket 5, and the two can be interference fit, and the other end of the support member 601 is provided with a display screen control module 602. Optionally, the support member 601 can specifically include a connecting column and a connecting plate, one end of the connecting column can be inserted into the mounting hole of the rotating bracket 5, and the other end of the connecting column is fixedly connected to the connecting plate, and the display screen control module 602 is provided on the connecting plate, so that the liquid crystal display screen 603 is more stable. The above-mentioned liquid crystal display screen 603 can provide visual indications, displaying the current rotation mode of the knob, as well as preset information such as temperature and time.

[0062] Exemplarily, each electronic device in the present application is electrically connected to the control circuit board 1. Specifically, these electronic devices are connected by wires. The above-mentioned support structure 8 and support member 601 can be set as a hollow structure so that the wires can pass through the hollow area to connect the display screen control module 602, the liquid crystal display screen 603, and the position detection device 3 to the corresponding pads on the circuit board 1, respectively, so that the entire knob structure is more compact and more reliable.

[0063] Exemplarily, the position detection module is used to detect the magnetic field position of the rotor 402 of the brushless motor 4. When the angle or displacement of the magnet of the rotor 402 changes, it will cause a certain change in resistance or voltage. The control circuit board 1 can convert it into a pulse signal or an analog signal and then display the encoded result on the screen after program processing (such as the preset information mentioned above).

[0064] In an exemplary embodiment, please refer to Figure 2 The rotating shell 7 includes a cylindrical structure 701 and a transparent protective shell 702; one end of the cylindrical structure is fixedly connected to the rotating bracket 5, and the other end of the cylindrical structure is covered with the transparent protective shell 702. Specifically, the rotating bracket 5 and the rotating shell 7 can be made of plastic material, which is convenient for molding and processing and has the characteristics of light weight and low cost. In order to facilitate cleaning and have good visibility, the transparent protective shell 702 can be made of glass material, which has a longer life. Of course, transparent plastic material, such as organic glass, can also be used as needed.

[0065] In an exemplary embodiment, the mode switching device 2 includes a pressure sensor or a touch switch; the position detection device 3 includes a magnetic sensor or a detection resistor, and the detection resistor is arranged at the tail end of the coil of the stator 401. Optionally, the mode switching device 2 plays the role of a button for selecting and confirming a function. For example, when the user needs to switch the current rotation mode, it can be achieved by pressing the knob. For details, please continue to refer to Figure 2 The control circuit board 1 also integrates a single-chip microcomputer, a light-emitting component 9 and a buzzer 10, wherein the single-chip microcomputer is electrically connected to the light-emitting component 9, the buzzer 10, and other devices (such as the position detection device 3, the mode switching device 2, the display device 6), etc., so as to control the entire knob. The light-emitting component 9 can provide lighting effects, and the buzzer 10 can provide sound effects. The corresponding lighting and sound effects can be customized in different modes.

[0066] Optionally, the position detection device 3 can be a detection resistor, and specifically, the detection resistor can be connected to the tail end of the coil of the stator 401, so that when the rotor 402 rotates and sweeps across the coil of the stator 401, the rotor 402 rotates to different positions, and the corresponding back electromotive force values ​​generated by electromagnetic induction are also different, and then the current position of the rotor 402 can be determined based on the detected back electromotive force value.

[0067] See also Figure 4 , which is a flowchart of an exemplary method for controlling a knob of the present application. A method for controlling a knob provided in an embodiment of the present application is applied to the above-mentioned knob, and the method comprises:

[0068] S401: Determine the rotation mode of the knob using the mode switching device.

[0069] Exemplarily, the mode switching device 2 includes a pressure sensor or a touch switch. In this embodiment, the mode switching device 2 is described as a pressure sensor.

[0070] In an exemplary embodiment, step S401 may specifically include: obtaining a voltage signal sent by the mode switching device 2; when a voltage value corresponding to the voltage signal is greater than or equal to a preset voltage value, switching the current rotation mode of the knob to another rotation mode, and displaying it on the LCD screen 603 of the display screen device 6. Optionally, due to the elastic connection between the brushless motor 4 and the control circuit board 1, when the user presses the knob downward, the rotor 402 connected to the knob housing and the stator 401 connected to the rotor 402 cause the entire brushless motor 4 to move downward. When the brushless motor 4 contacts the pressure plate of the pressure sensor, the pressure sensor converts the pressure acting on the pressure plate into a voltage signal, and sends it to the single-chip microcomputer on the control circuit board 1, so that it judges whether the voltage value of the piezoelectric signal exceeds the preset voltage value. If so, it controls the switching of the next preset rotation mode. For example, if there is no state at present, the next preset rotation mode to be switched can be the set first rotation mode, such as the smooth mode. The arrangement order of these rotation modes can be pre-set, so that each time the user presses the knob downward, the single-chip microcomputer receives a piezoelectric signal, thereby realizing the switching of the rotation mode.

[0071] Exemplarily, the rotation modes in the present application may include a smooth mode, a damping mode, a ratchet mode, a boundary mode and an automatic rotation mode. The specific functions of each mode are described in detail below.

[0072] S403: Acquire the rotation position of the rotor detected by the position detection device.

[0073] Exemplarily, the position detection device 3 includes a magnetic sensor or a detection resistor, and the detection resistor is arranged at the tail end of the coil of the stator 401. In this embodiment, the position detection device 3 is a magnetic sensor, and when the rotor 402 rotates, its corresponding magnetic field will change, and the change in the angle or displacement of the magnet of the rotor 402 will cause a certain resistance or voltage change, thereby realizing the detection of the rotation position of the rotor 402.

[0074] S405: Based on the rotation mode and the rotation position of the rotor, the stator of the brushless motor 4 is controlled to operate so as to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction.

[0075] Exemplarily, when the rotation mode is different, the corresponding target direction of the rotation of the rotor 402 can be different, so that the feel (force feedback) felt by the user when the knob is used to rotate is different. The target direction specifically refers to the direction of the electromagnetic force acting on the rotor 402 generated by controlling the multiple groups of electromagnetic coils of the stator 401. Specifically, the rotation mode can include at least a smooth mode, a damping mode, a ratchet mode, a boundary mode and an automatic rotation mode. The following will describe the corresponding knob control method under each rotation mode. Optionally, it can also include a standby mode. In the standby mode, the LCD display 603 can display information such as temperature and time. When the user rotates the knob housing, the LCD display 603 can display the corresponding rotation mode, temperature, time and other information. These preset information can be modified and edited as needed, and there is no limitation here. Optionally, when the knob is in standby mode, when the user presses the knob, the next rotation mode switched to can be the rotation mode arranged in the first order (such as the smooth mode), or it can be the next rotation mode of the last selected rotation mode in history. For example, if the last selected mode is the smooth mode, after turning off the device, pressing the knob will switch to the damping mode. The above control logic is only an example. In fact, it can also be set as needed.

[0076] When the rotation mode of the knob is the smooth mode, step S405 may specifically include: determining the target switch corresponding to the target coil group of the stator 401 based on the rotation position of the rotor 402; controlling the target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob. Taking the connection method of multiple groups of coils of the stator 401 as a three-phase winding star connection as an example, by controlling the closing of the corresponding switch, the corresponding coil group can be energized, so that the generated magnetic field forms a force in the target direction on the rotor 402. In this smooth mode, the brushless motor 4 will control the rotor 402 along the direction of the knob rotation, providing an assist, so that the user can easily turn the knob with just a little effort.

[0077] When the rotation mode of the knob is the damping mode, step S405 may specifically include: determining the target switch corresponding to the target coil group of the stator based on the rotation position of the rotor; controlling the target switch to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob. Continuing with the above example, in this damping mode, the brushless motor 4 will control the rotor 402 in the opposite direction of the knob rotation, providing a counter-pull force, giving a thick feel.

[0078] When the rotation mode of the knob is the ratchet mode, step S405 may specifically include: determining a first target switch corresponding to the first target coil group of the stator based on the rotation position of the rotor; controlling the first target switch to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob; when the rotor 402 rotates to a preset settling position, determining a second target switch corresponding to the second target coil group of the stator 401; controlling the second target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob.

[0079] See also Figure 5 , which shows an exemplary knob rotation principle diagram in a ratchet mode of the present application. When the knob can rotate 360 ​​degrees, the rotation circle can be divided into 8 segments as shown in the figure, namely 0-7 segment, 6-7 segment, 5-6 segment, 4-5 segment, 3-4 segment, 2-3 segment, 1-2 segment, 0-1 segment, and the corresponding rotation angle of each segment is 45 degrees. The setback position can be set in the middle of each segment as needed, such as Figure 5 The s position in each segment represents a setback position. The feel of the setback position in each segment is different in the front and rear segments. Specifically, the front half may be a resistance feel, and the rear half may be a smooth feel. In this way, in this rotation mode, the user can experience a setback feel with a clicking sound. The number of intervals can be divided into the circumference according to the requirements of coarse ratchet (few) and fine ratchet (more). The middle of each interval is a setback point (the force change is most obvious). For example, taking the 0-7 segment as an example, when the user rotates the knob in the 0-s segment, the brushless motor 4 will control the rotor 402 in the opposite direction of the knob rotation, providing a counter-pulling force, which is reflected as a force that hinders the rotation of the hand. When the rotor 402 reaches the s position, the s-7 segment brushless motor 4 will move in the direction of the knob rotation, which is reflected as a power assist. The effect is a setback feel when turning.

[0080] When the rotation mode of the knob is the boundary mode, step S405 may specifically include: when the rotation position of the rotor exceeds a preset boundary position, controlling the rotor to return to the preset boundary position by controlling the closing of the target switch of the target coil group of the stator.

[0081] In the boundary effect mode, it plays a boundary control role similar to the effect of the spring limit. When the knob is turned to the over-limit position, the motor will automatically rotate back to the set boundary position. Specifically, the preset boundary position includes an upper boundary position and a lower boundary position. When the rotation position of the rotor 402 exceeds the upper boundary position, in this rotation mode, the single-chip microcomputer will generate a corresponding magnetic field force by controlling the switching state of the coil group of the stator 401 to pull the rotor 402 back to the upper boundary position. Similarly, when the rotation position of the rotor 402 exceeds the lower boundary position, in this rotation mode, the single-chip microcomputer will generate a corresponding magnetic field force by controlling the switching state of the coil group of the stator 401 to pull the rotor 402 back to the lower boundary position.

[0082] When the rotation mode of the knob is the automatic rotation mode, step S405 may specifically include: taking the rotation position of the rotor as the initial position, controlling the on / off state of the switches of the multiple sets of coils of the stator in a preset order to control the rotor to rotate in a preset direction. In this automatic rotation mode, the knob can realize automatic slow and uniform rotation of the knob, and at the same time, a preset animation effect can be played on the LCD screen 603, such as flashing lights of preset colors and preset sound effects.

[0083] It should be noted that the above examples only illustrate the control methods corresponding to the five rotation modes. In fact, two or more of the above modes may be mixed to form a mixed mode, thereby achieving a variety of mode effects.

[0084] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A knob, characterized in that: It includes a control circuit board, a mode switching device, a position detection device, a brushless motor, a rotating bracket, a display device and a rotating housing; The brushless motor comprises a stator and a rotor located inside the stator; the stator is elastically connected to the control circuit board; and the mode switching device is provided between the stator and the control circuit board; The position detection device is provided in the rotor, and the position detection device is used to detect the rotation of the rotor; One end of the rotor away from the control circuit board is connected to one side of the rotating bracket, and the other side of the rotating bracket is connected to the rotating shell to form a receiving cavity, and the display screen device is arranged in the receiving cavity.

2. The knob according to claim 1, characterized in that: It also includes support structures; The support structure includes a base and a support shaft; One end of the support shaft is connected to the base, and the other end of the support shaft is provided with the position detection device and extends deep into the rotor; One side of the base is fixedly connected to the stator, and the other side of the base is elastically connected to the control circuit board; The mode switching device is arranged on the circuit board.

3. The knob according to claim 1, characterized in that: A mounting hole is provided in the middle of the rotating bracket, and the diameter of the mounting hole is smaller than or equal to the diameter of the rotor.

4. The knob according to claim 3, characterized in that: The display screen device comprises a support, a display screen control module and a liquid crystal display screen; One end of the support member is connected to the rotating bracket through the mounting hole, and the other end of the support member is provided with the display screen control module; The display screen control module is electrically connected to the liquid crystal display screen.

5. The knob according to claim 1, characterized in that: The rotating shell comprises a cylindrical structure and a transparent protective shell; One end of the cylindrical structure is fixedly connected to the rotating bracket, and the other end of the cylindrical structure is covered with the transparent protective shell.

6. The knob according to claim 1, characterized in that: The mode switching device includes a pressure sensor or a touch switch; The position detection device includes a magnetic sensor or a detection resistor, and the detection resistor is arranged at the tail end of the coil of the stator.

7. A method for controlling a knob, characterized in that: Applied to the knob according to any one of claims 1 to 6, the method comprises: Determining the rotation mode of the knob using the mode switching device; Acquiring the rotational position of the rotor detected by the position detection device; The stator of the brushless motor is controlled to operate based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field, thereby controlling the rotor to rotate in a target direction.

8. The control method according to claim 7, characterized in that: The method of using the mode switching device to determine the rotation mode of the knob includes: Acquiring a voltage signal sent by the mode switching device; When the voltage value corresponding to the voltage signal is greater than or equal to the preset voltage value, the current rotation mode of the knob is switched to another rotation mode and displayed on the liquid crystal display screen of the display screen device.

9. The control method according to claim 8, characterized in that: The rotation mode of the knob includes a smooth mode and a damping mode; When the rotation mode of the knob is a smooth mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes: Determining a target switch corresponding to a target coil group of the stator based on a rotational position of the rotor; Controlling the target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob; When the rotation mode of the knob is a damping mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes: Determining a target switch corresponding to a target coil group of the stator based on a rotational position of the rotor; The target switch is controlled to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob.

10. The control method according to claim 9, characterized in that: The rotation modes of the knob also include ratchet mode, boundary mode and automatic rotation mode; When the rotation mode of the knob is a ratchet mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes: determining a first target switch corresponding to a first target coil group of the stator based on a rotational position of the rotor; Controlling the first target switch to be in a closed state to provide an electromagnetic force opposite to the rotation direction of the knob; When the rotor rotates to a preset setback position, determining a second target switch corresponding to a second target coil group of the stator; Controlling the second target switch to be in a closed state to provide an electromagnetic force in the same direction as the rotation direction of the knob; When the rotation mode of the knob is a boundary mode, controlling the stator of the brushless motor to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction includes: When the rotation position of the rotor exceeds a preset boundary position, controlling the rotor to return to the preset boundary position by controlling the closing of a target switch of a target coil group of the stator; When the rotation mode of the knob is the automatic rotation mode, the stator of the brushless motor is controlled to work based on the rotation mode and the rotation position of the rotor to generate a corresponding electromagnetic field and control the rotor to rotate in a target direction, including: Taking the rotation position of the rotor as the initial position, the on / off states of the switches of the multiple groups of coils of the stator are controlled in a preset sequence to control the rotor to rotate in a preset direction.

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