Locking force program control adjusting method and device based on brush motor

Abstract

The invention relates to the technical field of industrial control, and particularly discloses a locking force program control adjusting method and device based on a brush motor, and the method comprises the steps: collecting a current signal of an H-bridge drive circuit in real time in a process that the H-bridge drive circuit drives the brush motor, and converting the current signal into a voltage signal; a threshold value of the voltage signal is set, and an IO control signal is sent to the H-bridge driving circuit based on the voltage signal and the threshold value; and based on the IO control signal, the H-bridge driving circuit drives the brush motor, and the brush motor drives the execution mechanism to move so as to carry out locking limiting and locking force adjustment. According to the method, the current signal of the brush motor is controlled, and the threshold value of the voltage signal corresponding to the current signal is set, so that zero point or end point positioning of a Hall-free sensor, an encoder or an in-place switch and locking force control of a force-free sensor are realized, the cost is reduced, and the structural space is saved.

Description

Technical Field

[0001] The present invention relates to the field of industrial control technology, and in particular to a method and device for adjusting locking force programmably based on a brushed motor. Background Art

[0002] Brushed motors are commonly used in various motion mechanism products, such as automatic doors, door wings of channel gates, etc. They obtain the operating position signal through Hall sensors or encoders, perform feedback closed-loop control to improve the accuracy of reaching the specified position, and use in-place switches to locate the zero point or end point. However, some products cannot be installed with Hall sensors, encoders or in-place switches due to compact structure or no installation location.

[0003] In addition, in order to make the locking force of the brushed motor adjustable and controllable, a force sensor is needed to detect the locking force. Adding a force sensor also requires a corresponding installation position, which cannot be installed in some products due to structural limitations.

[0004] The Hall sensor, encoder, in-position switch, and force sensor required above are relatively expensive, so a circuit solution that can realize programmable adjustable locking force of a brushed motor without the above components is desired, thereby effectively reducing the cost of the product.

[0005] Based on this technical background, the present invention proposes a method and device for program-controlled adjustment of locking force based on a brushed motor. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention proposes a method and device for programmable adjustment of locking force based on a brushed motor. The method controls the current signal of the brushed motor and sets the threshold of the voltage signal corresponding to the current signal, thereby realizing the positioning of the zero point or end point without a Hall sensor, encoder, or in-position switch, and the locking force control without a force sensor, thereby reducing costs and saving structural space.

[0007] In order to achieve the above-mentioned object, the first aspect of the present invention provides a method for adjusting the locking force of a brushed motor through program control, comprising:

[0008] In the process of the H-bridge driving circuit driving the brushed motor, a current signal of the H-bridge driving circuit is collected in real time, and the current signal is converted into a voltage signal;

[0009] Setting a threshold of the voltage signal, and sending an IO control signal to the H-bridge driving circuit based on the voltage signal and the threshold;

[0010] Based on the IO control signal, the H-bridge driving circuit drives the brushed motor, and the brushed motor drives the actuator to move, thereby performing locking limit and locking force adjustment.

[0011] The second aspect of the present invention provides a locking force program-controlled adjustment device based on a brushed motor used in the above method, comprising:

[0012] A processor is provided with a communication control interface, an IO control output port and a voltage signal acquisition interface;

[0013] An H-bridge driving circuit is connected to the processor through the IO control output port and is provided with a driving interface and a current monitoring interface;

[0014] A current amplification / current comparison circuit, the input end of which is electrically connected to the current monitoring interface, and the output end of which is electrically connected to the voltage signal acquisition interface, for real-time acquisition of the current signal of the H-bridge drive circuit and conversion of the current signal into a voltage signal;

[0015] A brushed motor is communicatively connected to the H-bridge drive circuit via the drive interface.

[0016] The technical effects of the present invention include:

[0017] (1) The program-controlled locking force adjustment method based on a brushed motor proposed in the present invention controls the current signal of the brushed motor and sets the threshold of the voltage signal corresponding to the current signal, thereby realizing the zero point or end point positioning without a Hall sensor, encoder, or in-position switch, and the locking force control without a force sensor, thereby reducing costs and saving structural space.

[0018] (2) The program-controlled locking force adjustment method based on a brushed motor proposed in the present invention realizes program control of the locking force by controlling the processor through a digital interface to set the threshold value, thereby improving the control accuracy and flexibility.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0021] Figure 1 The present invention is a flowchart of a method for program-controlled adjustment of locking force based on a brushed motor.

[0022] Figure 2 The present invention is a schematic structural diagram of a specific implementation of the locking force program-controlled adjustment device based on a brushed motor proposed by the present invention. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0024] In the present invention, unless otherwise specified, the directional words used, such as "upper and lower", generally refer to the upper and lower parts of the device in normal use, and "inside and outside" refer to the outline of the device. In addition, the terms "first, second, third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first, second, third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0025] The present invention provides a method for adjusting the locking force of a brushless motor through program control. Figure 1 As shown, including:

[0026] When the H-bridge driving circuit drives the brushed motor, the current signal of the H-bridge driving circuit is collected in real time and converted into a voltage signal;

[0027] Setting a threshold of a voltage signal, and sending an IO control signal to an H-bridge driving circuit based on the voltage signal and the threshold;

[0028] Based on the IO control signal, the brushed motor is driven by the H-bridge drive circuit, and the actuator is driven by the brushed motor to move, and the locking limit and locking force are adjusted.

[0029] In the present invention, by controlling the current signal of the brushed motor and setting the threshold of the voltage signal corresponding to the current signal, the zero point or end point positioning without a Hall sensor, encoder, or in-position switch and the locking force control without a force sensor are realized, thereby reducing costs and saving structural space.

[0030] According to the present invention, the current signal of the H-bridge driving circuit is collected in real time, and the current signal is converted into a voltage signal through a current amplification / current comparison circuit.

[0031] According to the present invention, setting a threshold of a voltage signal, and sending an IO control signal to an H-bridge driving circuit based on the voltage signal and the threshold comprises:

[0032] Controlling the processor to set the threshold value via the communication interface;

[0033] The voltage signal is collected by the ADC of the processor;

[0034] Based on the voltage signal and threshold value collected by the ADC, the processor sends an IO control signal to the H-bridge drive circuit.

[0035] According to the present invention, the IO control signal includes a forward and reverse rotation signal and a stop and lock signal.

[0036] According to the present invention, setting the threshold of the voltage signal includes:

[0037] Determine the current signal corresponding to the maximum locking force through a current amplification / current comparison circuit;

[0038] A threshold of the voltage signal is set based on the current signal corresponding to the maximum locking force.

[0039] Preferably, the actuator is driven to move by a brushed motor, and the locking limit and locking force adjustment include:

[0040] The brushed motor drives the reducer / screw to move, and performs locking limit and locking force adjustment to increase the locking force and maintain the locking force after the brushed motor turns off the output.

[0041] In the present invention, the threshold value is set by controlling the processor through a digital interface, thereby realizing program control of the locking force and improving the control accuracy and flexibility.

[0042] The present invention also provides a locking force program-controlled adjustment device based on a brush motor used in the above method, such as Figure 2 As shown, including:

[0043] A processor is provided with a communication control interface, an IO control output port and a voltage signal acquisition interface;

[0044] The H-bridge driving circuit is connected to the processor through the IO control output port and is provided with a driving interface and a current monitoring interface;

[0045] A current amplification / current comparison circuit, the input end of which is electrically connected to the current monitoring interface, and the output end of which is electrically connected to the voltage signal acquisition interface, is used to collect the current signal of the H-bridge driving circuit in real time and convert the current signal into a voltage signal;

[0046] The brushed motor is connected to the H-bridge drive circuit through a drive interface.

[0047] According to the present invention, it also includes:

[0048] The actuator is rotatably connected to the brushed motor and is used for locking limit and locking force adjustment.

[0049] According to the present invention, the actuator is a speed reducer / screw.

[0050] According to the present invention, the threshold value of the voltage signal is set via the communication control interface.

[0051] The present invention will be described in more detail below through specific embodiments.

[0052] Example 1

[0053] This embodiment provides a locking force program-controlled adjustment device based on a brushed motor. Figure 2 As shown, including:

[0054] A processor is provided with a communication control interface, an IO control output port and a voltage signal acquisition interface;

[0055] The H-bridge driving circuit is connected to the processor through the IO control output port and is provided with a driving interface and a current monitoring interface;

[0056] A current amplification / current comparison circuit, the input end of which is electrically connected to the current monitoring interface, and the output end of which is electrically connected to the voltage signal acquisition interface, is used to collect the current signal of the H-bridge driving circuit in real time and convert the current signal into a voltage signal;

[0057] The brushed motor is connected to the H-bridge drive circuit through the drive interface;

[0058] An actuator, rotatably connected to the brushed motor, is used for locking limit and locking force adjustment;

[0059] In this embodiment, the actuator is a reducer / screw;

[0060] The threshold of the voltage signal is set via the communication control interface;

[0061] This embodiment provides a method for adjusting the locking force programmable based on a brushless motor. Figure 1 As shown, the specific steps include:

[0062] (1) The processor controls the H-bridge drive circuit through IO to control the brushed motor, thereby realizing the forward and reverse rotation of the brushed motor. The brushed motor drives the actuator to move, and the actuator moves to the locking limit to complete the locking; the H-bridge drive circuit drives the current of the brushed motor to pass through the current amplifier circuit to convert the current into a voltage signal, and the ADC of the processor collects this voltage signal. When the voltage value collected by the ADC reaches the set threshold, the H-bridge drive circuit is controlled through IO to stop output, so as to keep the mechanism locked; the locking force of the mechanism is controlled by adjusting the set threshold;

[0063] (2) Controlling the setting threshold of the processor through the communication interface, and adjusting the locking force by adjusting the voltage threshold, thereby realizing program-controlled locking force;

[0064] (3) The maximum locking force can be set through the current comparison circuit. By setting the current corresponding to the maximum locking force, when the actual current is greater than the designed current, the comparison circuit forces the H-bridge control signal to be pulled low, thereby protecting the circuit and structure;

[0065] (4) The actuator can use a brushed motor to drive the lead screw, thereby increasing the locking force and maintaining the locking force after the brushed motor turns off its output.

[0066] The program-controlled adjustment method of locking force based on a brushed motor proposed in an embodiment of the present invention controls the current signal of the brushed motor and sets the threshold of the voltage signal corresponding to the current signal, thereby realizing the positioning of the zero point or end point without a Hall sensor, encoder, or in-position switch, and the locking force control without a force sensor, thereby reducing costs and saving structural space.

[0067] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for adjusting the locking force by program control based on a brushed motor, characterized in that: include: In the process of the H-bridge driving circuit driving the brushed motor, a current signal of the H-bridge driving circuit is collected in real time, and the current signal is converted into a voltage signal; Setting a threshold of the voltage signal, and sending an IO control signal to the H-bridge driving circuit based on the voltage signal and the threshold; Based on the IO control signal, the H-bridge driving circuit drives the brushed motor, and the brushed motor drives the actuator to move, thereby performing locking limit and locking force adjustment.

2. The method according to claim 1, characterized in that: The current signal of the H-bridge driving circuit is collected in real time, and the current signal is converted into a voltage signal through a current amplification / current comparison circuit.

3. The method according to claim 1, characterized in that: Setting a threshold of the voltage signal, and sending an IO control signal to the H-bridge driving circuit based on the voltage signal and the threshold comprises: Controlling the processor to set the threshold value via the communication interface; The voltage signal is collected by an ADC of the processor; Based on the voltage signal and the threshold value collected by the ADC, the processor sends an IO control signal to the H-bridge driving circuit.

4. The method according to claim 3, characterized in that The IO control signal includes a forward and reverse rotation signal and a stop and lock signal.

5. The method according to claim 2, characterized in that: Setting the threshold of the voltage signal includes: Determine the current signal corresponding to the maximum locking force by the current amplification / current comparison circuit; A threshold of the voltage signal is set based on the current signal corresponding to the maximum locking force.

6. The method according to claim 1, characterized in that The brushed motor drives the actuator to move, and the locking limit and locking force adjustment include: The brushed motor drives the reducer / screw to move, and performs locking limit and locking force adjustment to increase the locking force and maintain the locking force after the brushed motor is turned off.

7. A locking force program-controlled adjustment device based on a brush motor used in the method according to any one of claims 1 to 6, characterized in that: include: A processor is provided with a communication control interface, an IO control output port and a voltage signal acquisition interface; An H-bridge driving circuit is connected to the processor through the IO control output port and is provided with a driving interface and a current monitoring interface; A current amplification / current comparison circuit, the input end of which is electrically connected to the current monitoring interface, and the output end of which is electrically connected to the voltage signal acquisition interface, for real-time acquisition of the current signal of the H-bridge drive circuit and conversion of the current signal into a voltage signal; A brushed motor is communicatively connected to the H-bridge drive circuit via the drive interface.

8. The device according to claim 7, characterized in that Also includes: The actuator is rotatably connected to the brushed motor and is used for locking limit and locking force adjustment.

9. The device according to claim 8, characterized in that The actuator is a reducer / screw.

10. The device according to claim 7, characterized in that The threshold of the voltage signal is set via the communication control interface.

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