WO2020221044A1

WO2020221044A1 - Control method for step motor and mobile terminal

Info

Publication number: WO2020221044A1
Application number: PCT/CN2020/085669
Authority: WO
Inventors: 张潮红
Original assignee: 维沃移动通信有限公司
Priority date: 2019-04-28
Filing date: 2020-04-20
Publication date: 2020-11-05
Also published as: CN109981009A; CN109981009B

Abstract

A control method for a step motor, and a mobile terminal, the method comprising: within a process of a step motor driving a sliding block to move from a first limiting position to a second limiting position, determining a current position of the sliding block (step 101); if the distance between the current position and the second limiting position is greater than a preset threshold, then driving the step motor according to a first current (step 103); and if the distance is less than the preset threshold, then driving the step motor according to a second current, the second current being smaller than the first current (step 105).

Description

Control method of stepping motor and mobile terminal

Cross references to related applications

This application claims the priority of Chinese Patent Application No. 201910348649.5 filed in China on April 28, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of mobile terminals, and in particular to a method for controlling a stepping motor and a mobile terminal.

Background technique

Stepping motors have been widely used, ranging from mechanical engineering to smart terminal devices, especially smart terminal devices that require high precision, low power consumption, and cost, such as telescopic cameras of smart terminal devices. The stepping motor drives the metal screw and plastic slide mode to realize the extension and contraction of the camera. Specifically, when the plastic slider moves to the limit position on the lead screw and is stuck, due to the large output torque of the motor, the lead screw may be driven to rotate, causing the sliding wire vibration between the lead screw and the slider to generate noise. Noise will also be generated when the stepper motor works abnormally, which will not only affect the user experience, but also affect the accuracy of the stepper motor's operation and reduce the service life of the stepper motor.

Therefore, there is a need for an effective stepper motor control solution to solve the noise problem caused by idling after the slider driven by the stepper motor moves into position and gets stuck.

Summary of the invention

The embodiments of the present disclosure provide a stepping motor control method and a mobile terminal, so as to solve the noise problem caused by idling after the sliding block driven by the stepping motor moves into position and gets stuck, and to ensure the service life of the stepping motor and Run accuracy and improve user experience.

In order to solve the above technical problems, the present disclosure is implemented as follows:

In the first aspect, a method for controlling a stepper motor is provided, and the method includes:

Determining the current position of the slider during the process of pushing the slider from the first limit to the second limit by the stepping motor;

If the distance between the current position and the second limit is greater than a preset threshold, drive the stepping motor according to the first current;

If the distance is less than the preset threshold, the stepping motor is driven according to a second current, which is less than the first current.

In a second aspect, a mobile terminal is provided, and the mobile terminal includes:

The determining module is used for determining the current position of the slider when the stepper motor pushes the slider from the first limit to the second limit;

A control module, configured to drive the stepping motor according to a first current when the distance between the current position and the second limit is greater than a preset threshold;

The control module is further configured to drive the stepping motor according to a second current when the distance is less than the preset threshold, and the second current is less than the first current.

In a third aspect, a mobile terminal is provided. The mobile terminal includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor. When the computer program is executed by the processor, Implement the steps of the method as described in the first aspect.

In a fourth aspect, a computer-readable storage medium is provided, wherein a computer program is stored on the computer-readable storage medium, and the computer program implements the steps of the method described in the first aspect when the computer program is executed by a processor.

In the embodiment of the present disclosure, a stepper motor is used to push the slider to move between the first limit and the second limit, and the stepper motor is used to push the slider to move from the first limit to the second limit. , Adjust the current used to drive the stepping motor according to the current position of the slider. Specifically, when the slider is farther from the second limit, that is, the distance from the second limit is greater than the preset threshold, the The first current drives the stepper motor to move the slider, and when the slider is closer to the second limit, the distance between the slider and the second limit is less than the distance threshold, the stepper motor is driven according to the smaller second current Run to push the slider. In this way, by reducing the current used to drive the stepping motor, the output torque of the stepping motor is reduced, so that when the slider quickly moves to the second limit, a smaller output torque can ensure that the lead screw can rotate normally. And when the slider moves to the second limit, the output torque cannot drive the screw to continue to rotate, which can reduce or eliminate the rotational vibration noise between the screw and the slider, so as to ensure the service life and operating accuracy of the stepping motor. Improve user experience.

Description of the drawings

The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

FIG. 1 is a schematic flowchart of a stepping motor control method in an embodiment of the present disclosure;

Figure 2 is a schematic diagram of a stepping motor control system in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of the structure of a mobile terminal in an embodiment of the present disclosure;

Fig. 4 is a schematic diagram of another structure of a mobile terminal in an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

For the stepper motor drive screw and slider solution stated in the background technology section, photoelectric devices are generally used to detect whether the slider moves in place, so that the motor stops running after the slider moves in place to minimize the time of idling noise. . For example, a magnet can be added to the slider, and the strength of the magnet on the slider can be detected by the Hall sensor, so as to determine whether the slider has moved in place according to the detection value and stability of the Hall sensor. However, the vibration of the slider during the movement will affect the stability of the detection value of the Hall sensor, so that it is impossible to accurately determine whether the slider has moved in place, that is, the Hall sensor detects that the slider moves in place and is stuck. There will be a delay, resulting in the inability to stop the motor in time, and the motor will continue to drive the screw to rotate due to the large output torque of the motor, causing the sliding wire between the screw and the slider to vibrate and generate noise, so that the motor stops Before running, the noise caused by the vibration of the sliding wire will last a long time before it disappears.

Therefore, there is a need for an effective stepper motor control solution to solve the noise problem caused by idling after the slider driven by the stepper motor is stuck in place and improve user experience.

The technical solutions provided by the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of the present disclosure provides a method for controlling a stepper motor, which is executed by a mobile terminal. The method may specifically include:

Step 101: Determine the current position of the slider when the stepper motor pushes the slider from the first limit to the second limit.

Step 103: If the distance between the current position and the second limit is greater than the preset threshold, drive the stepping motor according to the first current.

Step 105: If the distance is less than the preset threshold, drive the stepping motor according to the second current, which is less than the first current.

Optionally, the stepper motor can push the slider from the first limit to the second limit on the screw, and determine the corresponding current to drive the stepper motor to push the slider according to the current position of the slider on the screw. Block move.

In the embodiment of the present disclosure, a stepper motor is used to push the slider to move between the first limit and the second limit, and the stepper motor is used to push the slider to move from the first limit to the second limit. , Adjust the current used to drive the stepping motor according to the current position of the slider. Specifically, when the slider is farther from the second limit, that is, the distance from the second limit is greater than the preset threshold, the The first current drives the stepper motor to move the slider, and when the slider is closer to the second limit, the distance between the slider and the second limit is less than the distance threshold, the stepper motor is driven according to the smaller second current Run to push the slider. In this way, by reducing the current used to drive the stepping motor, the output torque of the stepping motor is reduced, so that when the slider quickly moves to the second limit, a smaller output torque can ensure that the screw can rotate normally At the same time, it can reduce or eliminate the sliding wire vibration between the lead screw and the slider, thereby reducing or preventing the noise generated between the lead screw and the slider, so as to ensure the service life and operating accuracy of the stepping motor, and improve the user experience .

Among them, the value of the distance threshold can be limited according to actual conditions, for example, limited to 1 mm.

For example, as shown in Figure 2, the system controller provides power to the stepper motor by controlling the power supply module for the motor, and by controlling the operating accuracy, operating speed and direction, and operating current of the stepper motor driver. The stepping motor is driven by a two-phase current drive as shown in Figure 2. The stepping motor outputs torque based on the aforementioned operating parameters and drives the screw to rotate, thereby pushing the slider at the limit 1 and limit of the screw. 2 for telescopic movement. Specifically, based on the characteristics of the output torque of the stepper motor related to the phase current, that is, the greater the phase current, the greater the output torque, the stepping motor control method according to the embodiment of the invention can be based on the slider on the screw The specific position control is used to drive the phase current of the stepper motor to reduce the output torque of the stepper motor by reducing the current before the slider moves to the limit position (limit 1 or limit 2). Then, when the screw cannot be rotated after the slider is stuck, the noise caused by the sliding wire vibration caused by the screw still idling after the slider is in place can be eliminated, thereby improving the user experience.

It should be noted that when the stepper motor pushes the slider to move from limit 1 to limit 2 of the screw, limit 1 is the first limit and limit 2 is the second limit; When the motor pushes the slider to move from the limit 2 of the screw to the limit 1, the limit 1 is the second limit, and the limit 2 is the first limit.

Optionally, in the stepping motor control method of the embodiment of the present disclosure, the above-mentioned second current is the limit minimum current required by the stepping motor to push the slider to move.

It can be understood that the second current is the limit current required by the stepper motor to push the slider to move, that is, when the current used to drive the stepper motor reaches the second current, the stepper motor can just drive the motor load, namely the screw and the slider. Movement, that is, the second current is the minimum critical current that can drive the motor load to move.

Among them, the second current can be a value calibrated before the mobile terminal leaves the factory, as a system preset parameter, used in the process of controlling the operation of the stepping motor; the specific current calibration determination process can include: the system passes thrust calibration, configuration steps The current entering the motor driver changes from small to large, and the stepper motor runs at a certain speed, such as keeping a low speed, using a Hall sensor to detect the position of the slider, when the driving current reaches Ic (the second current) Normally drive the stepper motor to run, that is, when the Hall sensor can detect that the position of the slider just changes, it is considered that the current Ic can just drive the motor load. Further, in order to ensure the stability and accuracy of the second current after the mobile terminal leaves the factory, the second current may be calibrated periodically or whenever the operating time of the stepping motor reaches a certain value.

Optionally, in the stepping motor control method of the embodiment of the present disclosure, after the stepping motor is driven to operate according to a larger first current is converted to the stepping motor is driven to operate according to a smaller second current, it may further include The following process steps:

If it is detected that the slider moves to the second limit or the duration of continuously driving the stepper motor according to the second current reaches the duration threshold, the stepper motor is controlled to stop running.

It can be understood that after the current used to drive the stepper motor is reduced from the first current to the second current, in order to further reduce or eliminate the noise generated by the sliding wire vibration between the lead screw and the slider due to idling, the When it is detected that the slider moves to the second limit or the duration of the stepping motor continuously running at the second current reaches the duration threshold, the stepping motor is directly controlled to stop running.

Among them, the value of the duration threshold can be limited according to actual conditions.

Optionally, in the stepping motor control method of the embodiment of the present disclosure, in order to ensure the pushing effect of the stepping motor on the slider, that is, to ensure the telescopic movement efficiency of the slider, it can be driven according to the first current and the second current. While stepping the motor, make the rotation speed of the stepping motor the first rotation speed.

Further, in the stepping motor control method of the embodiment of the present disclosure, after the stepping motor receives the start command and starts to run, in order to ensure the smoothness and mute effect of the stepping motor, the current state of the slider is determined Before the location steps, the following process steps can be performed:

From the moment of starting the stepper motor, drive the stepper motor according to the second speed and the third current;

When the stepping motor is driven for the first duration according to the second rotation speed and the third current, the stepping motor is driven according to the third rotation speed and the third current, wherein the second rotation speed is less than the third rotation speed, and the third rotation speed is greater than the first rotation speed. The third current is greater than the second current.

It can be understood that after the stepping motor is started to run, the stepping motor is first driven at a low speed and high current to run for the first time, and then the stepping motor is driven at a high speed and high current.

Among them, the value of the first duration can be selected and set according to specific conditions.

At the same time, considering that the output torque of a stepper motor is inversely proportional to the speed, that is, the higher the speed, the smaller the torque. Therefore, first drive the stepper motor at a low speed to increase the output torque of the stepper motor as soon as possible The size of the movement of the block, in order to facilitate the subsequent movement of the slider to a position close to the second limit, to better reduce or eliminate the noise generated by the sliding wire vibration between the lead screw and the slider. Increase the speed while maintaining a large current, and run at a high speed.

More specifically, in the process of starting the stepper motor to push the slider from the first limit to the second limit, when the stepper motor completes the above-mentioned operation of converting from a low-speed, high-current drive to a high-speed, high-current drive After the steps, perform the step of determining the current position of the slider to achieve the purpose of reducing power consumption. In other words, the step of determining the current position of the slider in step 101 of the stepping motor control method of the embodiment of the present disclosure can be specifically executed as follows:

After the stepping motor is driven for the second duration according to the third rotational speed and the third current, the current position is determined.

Among them, the value of the second duration can be selected and set according to specific conditions.

In summary, in the stepping motor control method of the embodiment of the present disclosure, the operation phase from low speed and high current to high speed and high current operation phase to low speed and high current operation phase is realized in turn. Enter the low speed, low current operation stage.

Optionally, in the stepping motor control method of the embodiment of the present disclosure, the current position of the slider can be determined by the combination of the magnet and the Hall sensor, that is, when the magnet is provided on the slider, the The following steps determine the current position of the slider:

Acquiring the first detection value of the magnet by the first hall sensor, and the first hall sensor is set close to the first limit;

Acquire the second detection value of the second Hall sensor to the magnet, and the second Hall sensor is set close to the second limit;

According to the first detection value and the second detection value, the current position is determined.

It can be understood that when the stepper motor pushes the slider from the first limit to the second limit, the magnet is detected simultaneously by the first Hall sensor and the second Hall sensor respectively, based on the obtained first The detection value and the second detection value determine the current position of the slider; wherein the first detection value and the second detection value may be magnetic field strength values.

Considering that when the position of the slider is detected by the Hall sensor, if the Hall sensor is closer to the slider, the detection value will be larger, and when the Hall sensor is farther from the slider, the detection value will be greater. Therefore, the real-time position of the slider on the lead screw can be preliminarily and accurately determined through the detection value of the Hall sensor.

Specifically, when the first detection value detected by the first Hall sensor is small enough to be in the first interval and the second detection value detected by the second Hall sensor is large enough to be in the second interval, it means that the slider is the first The Hall sensor is farther and closer to the second Hall sensor, that is, the slider has moved to approach or reach a position where the drive current of the stepping motor needs to be reduced.

In addition, it should be noted that, as shown in Figure 2, when the stepper motor pushes the slider to move from limit 1 to limit 2 on the lead screw, Hall sensor 1 is the first Hall sensor and Hall sensor. 2 is the second Hall sensor; and when the stepper motor pushes the slider to move from the limit 2 on the screw to the limit 1, Hall sensor 1 is the second Hall sensor, and Hall sensor 2 is The first Hall sensor.

It can be seen from the above that, in the stepping motor control method of the embodiment of the present disclosure, on the basis of the Hall sensor detecting the position change of the stepping motor pushing the slider for telescopic movement, the stepping motor is reduced at an appropriate time. Phase current, when the stepper motor is locked, it is ensured that the torque of the screw cannot be transmitted to the back stage of the slider, so as to reduce or eliminate the noise caused by the vibration of the sliding wire between the screw and the slider. It is a good solution to the noise problem of the telescopic motor on the mobile terminal in the related technology.

Referring to FIG. 3, an embodiment of the present disclosure further provides a mobile terminal 200, and the mobile terminal 200 may specifically include:

The determining module 201 is used for determining the current position of the slider when the stepper motor pushes the slider from the first limit to the second limit;

The control module 203 is configured to drive the stepping motor according to the first current when the distance between the current position and the second limit is greater than a preset threshold;

The control module 203 is further configured to drive the stepping motor according to a second current when the distance is less than a preset threshold, and the second current is less than the first current.

Optionally, in the mobile terminal 200 provided by the embodiment of the present disclosure, the above-mentioned second current is the minimum current required by the stepper motor to push the slider to move.

Optionally, in the mobile terminal 200 provided by the embodiment of the present disclosure, the aforementioned control module 203 may also be used for:

When it is detected that the slider moves to the second limit or the duration of continuously driving the stepping motor according to the second current reaches the duration threshold, the stepping motor is controlled to stop running.

Optionally, in the mobile terminal 200 provided by the embodiment of the present disclosure, the rotation speed of the stepping motor when operating at the first current and the second current is the first rotation speed;

Wherein, before determining the current position of the slider, the aforementioned control module 203 may also be used to:

When the stepping motor is driven for the first duration according to the second rotation speed and the third current, the stepping motor is driven according to the third rotation speed and the third current, wherein the second rotation speed is less than the third rotation speed, and the third rotation speed is greater than the first rotation speed. The third current is greater than the second current;

The above determining module 201 may be specifically used for:

Optionally, in the mobile terminal 200 provided by the embodiment of the present disclosure, a magnet is provided on the aforementioned slider;

Wherein, the above determining module 201 may specifically include:

The first acquisition sub-module is used to acquire the first detection value of the magnet by the first Hall sensor, and the first Hall sensor is set close to the first limit;

The second acquisition sub-module is used to acquire the second detection value of the magnet by the second Hall sensor, and the second Hall sensor is set close to the second limit;

The determining sub-module is used to determine the current position according to the first detection value and the second detection value.

It can be understood that the mobile terminal 200 provided by the embodiments of the present disclosure can implement the aforementioned steps of the stepping motor control method executed by the mobile terminal 200. The relevant explanations about the stepping motor control method are all applicable to the mobile terminal 200. I won't repeat it here.

4 is a schematic diagram of the hardware structure of a mobile terminal implementing various embodiments of the present disclosure. The mobile terminal 300 includes but is not limited to: a radio frequency unit 301, a network module 302, an audio output unit 303, an input unit 304, a sensor 305, and a display unit 306, a user input unit 307, an interface unit 308, a memory 309, a processor 310, and a power supply 311 and other components. Those skilled in the art can understand that the structure of the mobile terminal shown in FIG. 4 does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than those shown in the figure, or combine certain components, or different components. Layout. In the embodiments of the present disclosure, mobile terminals include, but are not limited to, mobile phones, tablet computers, notebook computers, palmtop computers, vehicle-mounted terminals, wearable devices, and pedometers.

Among them, the processor 310 is configured to perform the following processes:

Determine the current position of the slider when the stepper motor pushes the slider from the first limit to the second limit;

If the distance between the current position and the second limit is greater than the preset threshold, drive the stepping motor according to the first current;

If the distance is less than the preset threshold, the stepping motor is driven according to the second current, which is less than the first current.

It should be understood that, in the embodiment of the present disclosure, the radio frequency unit 301 can be used for receiving and sending signals in the process of sending and receiving information or talking. Specifically, the downlink data from the base station is received and processed by the processor 310; in addition, Uplink data is sent to the base station. Generally, the radio frequency unit 301 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 301 can also communicate with the network and other devices through a wireless communication system.

The mobile terminal provides users with wireless broadband Internet access through the network module 302, such as helping users to send and receive emails, browse web pages, and access streaming media.

The audio output unit 303 may convert the audio data received by the radio frequency unit 301 or the network module 302 or stored in the memory 309 into audio signals and output them as sounds. Moreover, the audio output unit 303 may also provide audio output related to a specific function performed by the mobile terminal 300 (for example, call signal reception sound, message reception sound, etc.). The audio output unit 303 includes a speaker, a buzzer, a receiver, and the like.

The input unit 304 is used to receive audio or video signals. The input unit 304 may include a graphics processing unit (GPU) 3041 and a microphone 3042. The graphics processor 3041 is configured to monitor images of still pictures or videos obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. Data is processed. The processed image frame may be displayed on the display unit 306. The image frame processed by the graphics processor 3041 may be stored in the memory 309 (or other storage medium) or sent via the radio frequency unit 301 or the network module 302. The microphone 3042 can receive sound, and can process such sound into audio data. The processed audio data can be converted into a format that can be sent to the mobile communication base station via the radio frequency unit 301 for output in the case of a telephone call mode.

The mobile terminal 300 also includes at least one sensor 305, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel 3061 according to the brightness of the ambient light. The proximity sensor can close the display panel 3061 and the display panel 3061 when the mobile terminal 300 is moved to the ear. / Or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three-axis), and can detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the mobile terminal (such as horizontal and vertical screen switching, related games , Magnetometer attitude calibration), vibration recognition related functions (such as pedometer, percussion), etc.; the sensor 305 can also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, Infrared sensors, etc., will not be repeated here.

The display unit 306 is used to display information input by the user or information provided to the user. The display unit 306 may include a display panel 3061, and the display panel 3061 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

The user input unit 307 can be used to receive inputted numeric or character information, and generate key signal input related to user settings and function control of the mobile terminal. Specifically, the user input unit 307 includes a touch panel 3071 and other input devices 3072. The touch panel 3071, also called a touch screen, can collect the user's touch operations on or near it (for example, the user uses any suitable objects or accessories such as fingers, stylus, etc.) on the touch panel 3071 or near the touch panel 3071. operating). The touch panel 3071 may include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch position, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it To the processor 310, the command sent by the processor 310 is received and executed. In addition, the touch panel 3071 can be implemented in multiple types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 3071, the user input unit 307 may also include other input devices 3072. Specifically, other input devices 3072 may include, but are not limited to, a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackball, mouse, and joystick, which will not be repeated here.

Further, the touch panel 3071 can be overlaid on the display panel 3061. When the touch panel 3071 detects a touch operation on or near it, it is transmitted to the processor 310 to determine the type of the touch event, and then the processor 310 responds to the touch The type of event provides corresponding visual output on the display panel 3061. Although in FIG. 4, the touch panel 3071 and the display panel 3061 are used as two independent components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 3071 and the display panel 3061 can be integrated The implementation of the input and output functions of the mobile terminal is not specifically limited here.

The interface unit 308 is an interface for connecting an external device with the mobile terminal 300. For example, the external device may include a wired or wireless headset port, an external power source (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input/output (I/O) port, video I/O port, headphone port, etc. The interface unit 308 can be used to receive input (for example, data information, power, etc.) from an external device and transmit the received input to one or more elements in the mobile terminal 300 or can be used to connect to the mobile terminal 300 and external Transfer data between devices.

The memory 309 can be used to store software programs and various data. The memory 309 may mainly include a storage program area and a storage data area. The storage program area may store an operating system, an application program required by at least one function (such as a sound playback function, an image playback function, etc.), etc.; Data (such as audio data, phone book, etc.) created by the use of mobile phones. In addition, the memory 309 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

The processor 310 is the control center of the mobile terminal. It uses various interfaces and lines to connect the various parts of the entire mobile terminal, runs or executes software programs and/or modules stored in the memory 309, and calls data stored in the memory 309 , Perform various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole. The processor 310 may include one or more processing units; optionally, the processor 310 may integrate an application processor and a modem processor, where the application processor mainly processes the operating system, user interface, and application programs, etc. The adjustment processor mainly deals with wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 310.

The mobile terminal 300 may also include a power source 311 (such as a battery) for supplying power to various components. Optionally, the power source 311 may be logically connected to the processor 310 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions.

In addition, the mobile terminal 300 includes some functional modules not shown, which will not be repeated here.

Optionally, an embodiment of the present disclosure also provides a mobile terminal, including a processor 310, a memory 309, a computer program stored in the memory 309 and capable of running on the processor 310, and the computer program is executed by the processor 310 The various processes of the above-mentioned stepping motor control method embodiment are realized at a time, and the same technical effect can be achieved. To avoid repetition, details are not described here.

The embodiments of the present disclosure also provide a computer-readable storage medium, and a computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, each process of the above-mentioned stepper motor control method embodiment is realized, and can achieve The same technical effect is not repeated here in order to avoid repetition. Wherein, the computer-readable storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, It also includes other elements not explicitly listed, or elements inherent to the process, method, article, or device. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article or device that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better.的实施方式。 Based on this understanding, the technical solution of the present disclosure essentially or the part that contributes to the related technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk). ) Includes several instructions to make a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the method described in each embodiment of the present disclosure.

The embodiments of the present disclosure have been described above with reference to the accompanying drawings, but the present disclosure is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present disclosure, many forms can be made without departing from the purpose of the present disclosure and the scope of protection of the claims, all of which fall within the protection of the present disclosure.

Claims

A control method of a stepping motor includes:

Determining the current position of the slider during the process of pushing the slider from the first limit to the second limit by the stepping motor;

If the distance between the current position and the second limit is greater than a preset threshold, drive the stepping motor according to the first current;

If the distance is less than the preset threshold, the stepping motor is driven according to a second current, which is less than the first current.
The method according to claim 1, wherein the second current is a limit minimum current required by the stepper motor to push the slider to move.
The method according to claim 2, further comprising:

If it is detected that the sliding block moves to the second limit or the duration of continuously driving the stepping motor according to the second current reaches a duration threshold, the stepping motor is controlled to stop running.
3. The method according to claim 2, wherein the rotation speed of the stepping motor when operating at the first current and the second current is the first rotation speed;

Wherein, before the determining the current position of the slider, the method further includes:

Starting from the moment of starting the stepping motor, driving the stepping motor according to the second rotational speed and the third current;

When the stepping motor is driven for the first time period according to the second rotation speed and the third current, the stepping motor is driven according to the third rotation speed and the third current, wherein the second rotation speed is less than The third rotational speed, the third rotational speed is greater than the first rotational speed, and the third current is greater than the second current;

The determining the current position of the slider includes:

After the stepping motor is driven for a second duration according to the third rotational speed and the third current, the current position is determined.
The method according to any one of claims 1 to 4, wherein a magnet is provided on the slider;

Wherein, the determining the current position of the slider includes:

Acquiring a first detection value of the magnet by a first hall sensor, and the first hall sensor is arranged close to the first limit;

Acquiring a second detection value of the magnet by a second Hall sensor, and the second Hall sensor is arranged close to the second limit;

The current position is determined according to the first detection value and the second detection value.
A mobile terminal, including:

The determining module is used for determining the current position of the slider when the stepper motor pushes the slider from the first limit to the second limit;

A control module, configured to drive the stepping motor according to a first current when the distance between the current position and the second limit is greater than a preset threshold;

The control module is further configured to drive the stepping motor according to a second current when the distance is less than the preset threshold, and the second current is less than the first current.
The mobile terminal according to claim 6, wherein the second current is a limit minimum current required by the stepping motor to push the slider to move.
The mobile terminal according to claim 7, wherein the control module is further used for:

When it is detected that the slider moves to the second limit or the duration of continuously driving the stepping motor according to the second current reaches a duration threshold, the stepping motor is controlled to stop running.
8. The mobile terminal according to claim 7, wherein the rotation speed of the stepping motor when operating at the first current and the second current is the first rotation speed;

Wherein, the control module is further configured to: before determining the current position of the slider:

Starting from the moment of starting the stepping motor, driving the stepping motor according to the second rotational speed and the third current;

When the stepping motor is driven for the first time period according to the second rotation speed and the third current, the stepping motor is driven according to the third rotation speed and the third current, wherein the second rotation speed is less than The third rotational speed, the third rotational speed is greater than the first rotational speed, and the third current is greater than the second current;

The determining module is specifically used for:

After the stepping motor is driven for a second duration according to the third rotational speed and the third current, the current position is determined.
The mobile terminal according to any one of claims 6-9, wherein a magnet is provided on the slider;

Wherein, the determining module includes:

The first acquisition sub-module is configured to acquire the first detection value of the magnet by the first Hall sensor, and the first Hall sensor is arranged close to the first limit;

A second acquisition sub-module, configured to acquire a second detection value of the magnet by a second Hall sensor, the second Hall sensor being arranged close to the second limit;

The determining sub-module is configured to determine the current position according to the first detection value and the second detection value.
A mobile terminal, comprising: a memory, a processor, and a computer program stored on the memory and capable of running on the processor, the computer program being executed by the processor is implemented as in claims 1 to 5 Any of the steps of the method.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are realized.