Push rod limiting control device
By combining Hall sensors and motor control modules, the problem of switch contact sticking in push rod limit control devices under low voltage power supply is solved, realizing effective control and motor protection in space-constrained environments.
Patent Information
- Application Number
- CN202422887954.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing push rod limit control devices are prone to switch contact sticking under low voltage power supply conditions, and are difficult to meet the requirements in space-constrained situations.
A combination of Hall effect sensors and motor control modules is used. The signal from the Hall effect sensor changes when the magnet senses it, which controls the motor to stop running. The motor current is controlled by combining an optocoupler sensor and a MOSFET. A capacitor and a TVS diode are added to protect the motor.
It effectively avoids switch contact sticking in a miniaturized structure, protects the motor, and is suitable for space-constrained applications.
Smart Images
Figure CN223527923U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electromechanical control technical field, especially is a kind of push rod position limiting control device. BACKGROUND
[0002] The existing push rod limit control is mainly divided into two kinds, one is to realize limit by electronic mode, and the other is to realize limit by mechanical structure mode. The mechanical limit mode is to increase limit support and mechanical switch in the push rod, and the motor stops once reaching limit and touching mechanical switch. The advantage of this method is that the control can be external, and the electronic control is relatively simple. However, the switch of mechanical limit generally needs to pass motor current. And the existing push rod is mainly direct current motor, so especially in the occasion of low-voltage power supply (such as 12V), the current is often large, which is easy to cause the adhesion of switch contact, and finally the motor cannot be controlled to run. At the same time, the mechanical switch and the mechanical limit support are often large in size, and it is difficult to meet the demand by mechanical limit mode when the mechanical structure is compact and there is not much internal space.
[0003] The electronic limit mode is to install magnetic steel / magnetic ring at motor, and use hall to detect the magnetic steel / magnetic ring signal at motor, so the control board is generally built-in. However, the built-in control board will lead to the overall structure being not simple enough, and it is difficult to realize in some occasions, such as space-limited occasions. UTILITY MODEL CONTENTS
[0004] The utility model aims at overcoming the shortcomings of the push rod limit control device in the prior art that is easy to cause the adhesion of switch contact, and difficult to meet the demand in the occasion of small space or limitation, and provides a push rod limit control device.
[0005] The utility model aims at overcoming the shortcomings of the push rod limit control device in the prior art that is easy to cause the adhesion of switch contact, and difficult to meet the demand in the occasion of small space or limitation, and provides a push rod limit control device.
[0006] A push rod limit control device, comprising a motor, two hall sensors, a motor control module and a magnet arranged on the push rod, the motor controls the movement of the push rod between the two hall sensors, when the push rod approaches a certain hall sensor, the magnet on the push rod triggers the change of hall sensor signal, and the motor control module is triggered to work through the change of hall sensor signal, to control the motor to stop running.
[0007] The two hall sensors are respectively located at the upper and lower limits of the push rod, when the push rod reaches the upper limit, the magnet triggers the change of hall sensor signal at the upper limit, to trigger the motor control module to work and control the motor to stop running, so that the push rod stops moving. Similarly, when the push rod reaches the lower limit, the magnet triggers the change of hall sensor signal at the lower limit, to trigger the motor control module to work and control the motor to stop running, so that the push rod stops moving.
[0008] As preferred, the motor control module comprises two optical coupling sensors and two MOS tubes, a single Hall sensor, an optical coupling sensor and a MOS tube are matched, the Hall sensor controls the on-off of the optical coupling sensor, the optical coupling sensor controls the on-off of the MOS tube, the current passing through the motor is controlled through the on-off of the MOS tube, and the working state of the motor is controlled.
[0009] As preferred, the motor control module further comprises resistors R1, R2, R3, R4, diodes D1, D2, an external control input power port MO+ and an external control input power port MO-, the MOS tubes are NMOS tubes, including MOS tube Q1 and MOS tube Q2, the optical coupling sensors include optical coupling sensor U3 and optical coupling sensor U4, the external control input power port MO+ is connected with the anode of diode D1, one end of resistor R1 and the 3-pin of optical coupling sensor U3, the other end of resistor R1 is connected with one end of resistor R2 and the 4-pin of optical coupling sensor U3, the other end of resistor R2 is connected with the external control input power port MO-, the external control input power port MO- is connected with the anode of diode D2, one end of resistor R4 and the 3-pin of optical coupling sensor U4, the other end of resistor R4 is connected with one end of resistor R3 and the 4-pin of optical coupling sensor U4, the other end of resistor R4 is connected with the external control input power port MO+, the source of MOS tube Q1 is connected with the external control input power port MO+, the drain of MOS tube Q1 is connected with the motor, the gate of MOS tube Q1 is connected with the 4-pin of optical coupling sensor U3, the source of MOS tube Q2 is connected with the external control input power port MO-, the drain of MOS tube Q2 is connected with the motor, the gate of MOS tube Q2 is connected with the 4-pin of optical coupling sensor U4, the cathode of diode D1 and the cathode of diode D2 are connected with the motor, the 1-pin of optical coupling sensor U3 and the 1-pin of optical coupling sensor U4 are connected with the power supply, the 2-pin of optical coupling sensor U3 is connected with Hall sensor U1, and the 2-pin of optical coupling sensor U4 is connected with Hall sensor U2.
[0010] The principle of the motor control module is as follows: when the external control input power port MO+ is positive and the external control input power port MO- is negative, the MOS tube Q2 is turned on, at this time, the current direction is external control input power port MO+ → diode D1 → motor → MOS tube Q2 → external control input power port MO-, at this time, when the limit position is clicked to run, the corresponding Hall sensor U2 output HALL2 is pulled low, so that the optocoupler sensor U4 is turned on, the 4 pin of the optocoupler sensor U4 is forcibly pulled low by the 3 pin, the MOS tube Q2 is turned off, and the motor stops running; when the external control input power port MO+ is negative and the external control input power port MO- is positive, the MOS tube Q1 is turned on, at this time, the current direction is external control input power port MO- → diode D2 → motor → MOS tube Q1 → external control input power port MO+, at this time, when the limit position is clicked to run, the corresponding Hall sensor U1 output HALL1 is pulled low, so that the optocoupler sensor U3 is turned on, the 4 pin of the optocoupler sensor U3 is forcibly pulled low by the 3 pin, the MOS tube Q1 is turned off, and the motor stops running.
[0011] As preferred, the motor control module further comprises a capacitor C1 and a capacitor C2, one end of the external control input power port MO+ is connected to the capacitor C1, the other end of the capacitor C1 is connected to the gate of the MOS tube Q1, one end of the external control input power port MO- is connected to the capacitor C2, and the other end of the capacitor C2 is connected to the gate of the MOS tube Q2. The design of this scheme makes the capacitor C1 and the capacitor C2 charge and discharge, so that the MOS tube is in an incomplete conduction state, the voltage slowly rises or slowly drops, the effect of slow start and slow stop is achieved, and the motor can be better protected.
[0012] As preferred, the motor control module further comprises a TVS tube, the TVS tube comprises a TVS tube D13, a TVS tube D14, a TVS tube D15 and a TVS tube D16, the TVS tube D13 and the TVS tube D16 are connected in parallel between the source and the drain of the MOS tube Q1, and the TVS tube D14 and the TVS tube D15 are connected in parallel between the source and the drain of the MOS tube Q2. Since the motor is an inductive load, a high voltage will be generated in the MOS tube at the moment of turning off the MOS tube, and the MOS tube needs to be protected, otherwise the MOS tube is easy to be broken down; the design of this scheme makes the TVS tube form a discharge circuit, which effectively protects the MOS tube.
[0013] As preferred, the breakdown voltage of the TVS tube is less than the breakdown voltage of the MOS tube, and the power of the TVS tube is matched with the instantaneous voltage and current of the motor.
[0014] The utility model discloses a beneficial effect is: the utility model discloses the mode of hall sensor induction replaces the traditional switch, makes the whole structure of push rod more simple, and the volume is smaller, and still applicable under the occasion of some volume limitation, the design of electric capacity has played the function of slow start and slow stop, can better protection motor, the large current circuit only passes through MOS pipe, under the use of cooperation motor load, especially when big load, effectively avoided the problem of easy adhesion, TVS pipe constitutes the discharge circuit, effectively protected MOS pipe. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model,
[0016] Figure 2 It is the circuit principle drawing of motor control module of the utility model.
[0017] Among them: 1, motor, 2, hall sensor, 3, motor control module, 4, magnet. DETAILED DESCRIPTION
[0018] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art.
[0019] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the
[0020] Embodiment:
[0021] A push rod position control device, as shown in Figure 1 , comprising a motor 1, further comprising two hall sensors 2, motor control module 3 and the magnet 4 arranged on the push rod, the motor control push rod moves between two hall sensors, when the push rod is close to a certain hall sensor, the magnet on the push rod triggers the hall sensor signal change, the motor control module is triggered to work through the change of hall sensor signal, controls the motor to stop running.
[0022] Two Hall sensors are respectively located at the upper and lower limits of the push rod, when the push rod reaches the upper limit, the magnet triggers the Hall sensor signal change at the upper limit, thereby triggering the motor control module to control the motor to stop running, so that the push rod stops moving, similarly, when the push rod reaches the lower limit, the magnet triggers the Hall sensor signal change at the lower limit, thereby triggering the motor control module to control the motor to stop running, so that the push rod stops moving.
[0023] As shown in Figure 2 The motor control module includes two optocoupler sensors and two MOS tubes, a single Hall sensor, an optocoupler sensor and a MOS tube are matched, the Hall sensor controls the on-off of the optocoupler sensor, the optocoupler sensor controls the on-off of the MOS tube, the current passing through the motor is controlled through the on-off of the MOS tube, and the working state of the motor is controlled.
[0024] The motor control module further includes resistors R1, R2, R3, R4, diodes D1, D2, an external control input power port MO+ and an external control input power port MO-, the MOS tubes are NMOS tubes, including MOS tube Q1 and MOS tube Q2, the optocoupler sensors include optocoupler sensor U3 and optocoupler sensor U4, the external control input power port MO+ is connected with the anode of diode D1, one end of resistor R1 and the 3-pin of optocoupler sensor U3, the other end of resistor R1 is connected with one end of resistor R2 and the 4-pin of optocoupler sensor U3, the other end of resistor R2 is connected with the external control input power port MO-, the external control input power port MO- is connected with the anode of diode D2, one end of resistor R4 and the 3-pin of optocoupler sensor U4, the other end of resistor R4 is connected with one end of resistor R3 and the 4-pin of optocoupler sensor U4, the other end of resistor R4 is connected with the external control input power port MO+, the source electrode of MOS tube Q1 is connected with the external control input power port MO+, the drain level of MOS tube Q1 is connected with the motor, the gate of MOS tube Q1 is connected with the 4-pin of optocoupler sensor U3, the source electrode of MOS tube Q2 is connected with the external control input power port MO-, the drain level of MOS tube Q2 is connected with the motor, the gate of MOS tube Q2 is connected with the 4-pin of optocoupler sensor U4, the cathode of diode D1 and the cathode of diode D2 are connected with the motor, the 1-pin of optocoupler sensor U3 and the 1-pin of optocoupler sensor U4 are connected with the power supply, the 2-pin of optocoupler sensor U3 is connected with Hall sensor U1, and the 2-pin of optocoupler sensor U4 is connected with Hall sensor U2.
[0025] The working principle of the motor control module is as follows: when the external control input power port MO+ is positive and the external control input power port MO- is negative, the MOS tube Q2 is turned on, at this time, the current direction is external control input power port MO+ → diode D1 → motor → MOS tube Q2 → external control input power port MO-, at this time, when the limit position is clicked to run, the corresponding Hall sensor U2 output HALL2 is pulled low, so that the optocoupler sensor U4 is turned on, the 4 pin of the optocoupler sensor U4 is forcibly pulled low by the 3 pin, the MOS tube Q2 is turned off, and the motor stops running; when the external control input power port MO+ is negative and the external control input power port MO- is positive, the MOS tube Q1 is turned on, at this time, the current direction is external control input power port MO- → diode D2 → motor → MOS tube Q1 → external control input power port MO+, at this time, when the limit position is clicked to run, the corresponding Hall sensor U1 output HALL1 is pulled low, so that the optocoupler sensor U3 is turned on, the 4 pin of the optocoupler sensor U3 is forcibly pulled low by the 3 pin, the MOS tube Q1 is turned off, and the motor stops running.
[0026] The motor control module further comprises a capacitor C1 and a capacitor C2, one end of the external control input power port MO+ is connected to the capacitor C1, the other end of the capacitor C1 is connected to the gate of the MOS tube Q1, one end of the external control input power port MO- is connected to the capacitor C2, and the other end of the capacitor C2 is connected to the gate of the MOS tube Q2. In this design, the capacitor C1 and the capacitor C2 are charged and discharged, so that the MOS tube is in an incomplete conduction state, the voltage slowly rises or slowly drops, the effect of slow start and slow stop is achieved, and the motor can be better protected.
[0027] The motor control module further comprises a TVS tube, the TVS tube comprises a TVS tube D13, a TVS tube D14, a TVS tube D15 and a TVS tube D16, the TVS tube D13 and the TVS tube D16 are connected in parallel between the source and the drain of the MOS tube Q1, and the TVS tube D14 and the TVS tube D15 are connected in parallel between the source and the drain of the MOS tube Q2. Since the motor is an inductive load, a high voltage will be generated in the MOS tube at the moment when the MOS tube is turned off, and the MOS tube needs to be protected, otherwise the MOS tube is easy to be broken down; in this design, the TVS tube constitutes a discharge circuit, which effectively protects the MOS tube.
[0028] The breakdown voltage of the TVS tube is less than the breakdown voltage of the MOS tube, and the power of the TVS tube is matched with the instantaneous voltage and current of the motor.
[0029] In practical application, the TVS tube can also be replaced by a capacitor, which has the effect of absorbing and alternating current when the voltage suddenly changes. The effect of the capacitor is not as good as that of the TVS tube, but the cost is lower.
[0030] In this embodiment, the model of the MOS transistor is NCEP068N10G, the model of the TVS transistor is SMBJ64CA-AT / TR13, the model of the optical coupling sensor is EL357, the resistance R1 and the resistance R4 are 10KΩ, the resistance R2 and the resistance R3 are 15KΩ, J3 is a motor lead port, and J4 is a power port for external control input.
[0031] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the aspects of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.
[0032] It is to be understood that the application is not limited to the precise details of construction and the exemplary embodiments described above and illustrated in the drawings. The scope of the application is indicated by the appended claims rather than by the exemplary embodiments given above.
Claims
1. A push rod position control device comprising a motor, characterized by, It also includes two Hall sensors, a motor control module and a magnet arranged on the push rod, the motor controls the push rod to move between the two Hall sensors, when the push rod approaches a certain Hall sensor, the magnet on the push rod triggers the Hall sensor signal to change, the motor control module is triggered to work through the change of the Hall sensor signal, and the motor is controlled to stop running.
2. The push rod position control device of claim 1, wherein The motor control module includes two optocoupler sensors and two MOS tubes, a single Hall sensor, an optocoupler sensor and a MOS tube are matched, the Hall sensor controls the on-off of the optocoupler sensor, the optocoupler sensor controls the on-off of the MOS tube, the current passing through the motor is controlled through the on-off of the MOS tube, and the working state of the motor is controlled.
3. A push rod position control device according to claim 2, wherein The motor control module further includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, an external control input power port MO+ and an external control input power port MO-, the MOS tubes are NMOS tubes, the motor control module includes a MOS tube Q1 and a MOS tube Q2, the optocoupler sensors include an optocoupler sensor U3 and an optocoupler sensor U4, the external control input power port MO+ is connected with the anode of the diode D1, one end of the resistor R1, and the 3-pin of the optocoupler sensor U3, the other end of the resistor R1 is connected with one end of the resistor R2 and the 4-pin of the optocoupler sensor U3 at the same time, and the other end of the resistor R2 is connected with the external control input power port MO-; the external control input power port MO- is connected with the anode of the diode D2, one end of the resistor R4, and the 3-pin of the optocoupler sensor U4, the other end of the resistor R4 is connected with one end of the resistor R3 and the 4-pin of the optocoupler sensor U4 at the same time, and the other end of the resistor R4 is connected with the external control input power port MO+; the source electrode of the MOS tube Q1 is connected with the external control input power port MO+, the drain level of the MOS tube Q1 is connected with the motor, the gate electrode of the MOS tube Q1 is connected with the 4-pin of the optocoupler sensor U3, the source electrode of the MOS tube Q2 is connected with the external control input power port MO-, the drain level of the MOS tube Q2 is connected with the motor, the gate electrode of the MOS tube Q2 is connected with the 4-pin of the optocoupler sensor U4, the cathode of the diode D1 and the cathode of the diode D2 are connected with the motor at the same time, the 1-pin of the optocoupler sensor U3 and the 1-pin of the optocoupler sensor U4 are connected with a power supply, the 2-pin of the optocoupler sensor U3 is connected with a Hall sensor U1, and the 2-pin of the optocoupler sensor U4 is connected with a Hall sensor U2.
4. The push rod position control device of claim 3, wherein The motor control module further includes a capacitor C1 and a capacitor C2, one end of the capacitor C1 is connected with the external control input power port MO+, the other end of the capacitor C1 is connected with the gate electrode of the MOS tube Q1, one end of the capacitor C2 is connected with the external control input power port MO-, and the other end of the capacitor C2 is connected with the gate electrode of the MOS tube Q2.
5. The push rod position control device of claim 3, wherein The motor control module further comprises TVS tubes, the TVS tubes comprising TVS tube D13, TVS tube D14, TVS tube D15 and TVS tube D16, the TVS tube D13 and the TVS tube D16 being connected in parallel between the source and the drain of the MOS tube Q1, the TVS tube D14 and the TVS tube D15 being connected in parallel between the source and the drain of the MOS tube Q2.
6. A push rod position control device according to claim 5, wherein The breakdown voltage of the TVS tube is less than the breakdown voltage of the MOS tube, and the power of the TVS tube is matched with the instantaneous voltage and current of the motor.