A motor current detection and protection device

Abstract

The utility model discloses a motor current detection and protection device belongs to motor protection technical field, including input interface, current detection element, signal comparison element, threshold adjusting element, executive element, alarm element and output interface, input interface group series connection access motor power supply loop and connect current detection element, and current detection element is connected signal comparison element through signal conditioning circuit, and threshold adjusting element provides adjustable protection threshold to signal comparison element, and signal comparison element connects executive element, and executive element connects alarm element and output interface respectively, and output interface is used for connecting external power supply control module. Through above -mentioned construction, the device can real -time detection motor current, triggers alarm and exports protection signal to cut off power supply when overload, has the characteristics of quick reaction, strong adaptability, compact structure, is applicable to the current protection scene of alternating current or direct current motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor applications, specifically relating to a motor current detection and protection device. Background Technology

[0002] As a crucial drive component, electric motors are widely used in various fields, especially in civil aviation ground static power supply equipment. Electric mobile reel devices rely on motors to reel in and out cables and move the equipment, providing convenience for airport operations. However, in actual use, motors often face several risks: cable jams can easily cause motor stalling and damage to the equipment; and if obstacles are not properly protected during movement, the equipment may tip over.

[0003] Existing motor protection systems mostly rely on thermal overload relays and circuit breakers in the power supply circuit. These protection methods require a certain amount of heat to be accumulated before they can be triggered, resulting in a long protection response time and difficulty in dealing with sudden overload situations. Utility Model Content

[0004] The purpose of this invention is to provide a motor current detection and protection device that can solve the problem that existing protection devices cannot detect current in real time and have delayed protection actions, which can lead to equipment damage or personal injury.

[0005] To achieve the above objectives, this utility model employs the following technical solution.

[0006] A motor current detection and protection device, comprising: The system comprises an input interface, a current detection element U1, a signal comparator U3, a threshold adjustment element W1, an actuator, an alarm element H1, and an output interface. The input interface is electrically connected to the signal input terminal of the current detection element U1, for series connection to the motor power supply circuit. The signal output terminal of the current detection element U1 is electrically connected to the signal input terminal of the signal comparator U3. The two ends of the threshold adjustment element W1 are electrically connected to the system power supply VCC and system ground GND, respectively, and the adjustment terminal of the threshold adjustment element W1 is electrically connected to the threshold input terminal of the signal comparator U3. The output terminal of the signal comparator U3 is electrically connected to the control terminal of the actuator. The first execution terminal of the actuator is electrically connected to the alarm element H1, and the second execution terminal of the actuator is electrically connected to the output interface J3. The output interface J3 is used for electrical connection to an external motor power supply control module.

[0007] Furthermore, the signal output terminal of the current sensing element U1 is electrically connected to the signal input terminal of the signal comparator U3 through a signal conditioning circuit. The signal conditioning circuit includes an operational amplifier U2, resistors R1, R2, R3, and R4, and capacitors C1 and C2. The inverting input terminal of the operational amplifier U2 is electrically connected to one end of resistor R1, and the other end of resistor R1 is electrically connected to the first signal output pin of the current sensing element U1. The non-inverting input terminal of the operational amplifier U2 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to the second signal output pin of the current sensing element U1. The two ends of resistor R2 and capacitor C2 connected in parallel are electrically connected to the inverting input terminal and the output terminal of the operational amplifier U2, respectively. The two ends of resistor R4 and capacitor C1 connected in parallel are electrically connected to the non-inverting input terminal and system ground GND of the operational amplifier U2, respectively. The output terminal of the operational amplifier U2 is electrically connected to the signal input terminal of the signal comparator U3.

[0008] Furthermore, the actuating element includes a transistor Q1 and a relay K1. The relay K1 includes a coil K1A, a first contact K1B, and a second contact K1C. The base of the transistor Q1 is electrically connected to the output terminal of the signal comparator U3, the collector of the transistor Q1 is electrically connected to the negative terminal of the coil of the relay K1, and the emitter of the transistor Q1 is electrically connected to the system ground GND. The positive terminal of the coil of the relay K1 is electrically connected to the system power supply VCC. The second contact K1C of the relay K1 is connected in series with the alarm element H1 between the system power supply VCC and the system ground GND. The first contact K1B of the relay K1 is electrically connected to the pins of the output interface J3 in a one-to-one correspondence.

[0009] Furthermore, when the coil K1A of relay K1 is energized, it drives the first contact K1B and the second contact K1C to close synchronously.

[0010] Furthermore, it also includes a resistor R5; one end of the resistor R5 is electrically connected to the system power supply VCC, and the other end is electrically connected to the output terminal of the signal comparator U3.

[0011] Furthermore, it also includes a diode D1; the negative terminal of the diode D1 is electrically connected to the positive terminal of the relay coil K1A, and the positive terminal of the diode D1 is electrically connected to the negative terminal of the relay coil K1A.

[0012] Furthermore, the current sensing element U1 is a Hall effect current sensor; the power supply terminal of the Hall effect current sensor U1 is electrically connected to the system power supply VCC, and the ground terminal of the Hall effect current sensor U1 is electrically connected to the system ground GND.

[0013] Furthermore, the threshold adjustment element W1 is a potentiometer; the first fixed terminal of the potentiometer W1 is electrically connected to the system power supply VCC, the second fixed terminal of the potentiometer W1 is electrically connected to the system ground GND, and the sliding terminal of the potentiometer W1 is the adjustment terminal of the threshold adjustment element W1.

[0014] Furthermore, the input interface includes input interface J1 and input interface J2, which are adapted to AC power supply circuits or DC power supply circuits. The device can be used with AC motors or DC motors.

[0015] The advantages of this utility model are: It can detect motor current in real time through Hall effect current sensor, and quickly trigger protection action when overloaded to avoid equipment damage or personal injury; It has high adaptability, and the protection threshold can be adjusted by potentiometer, which can flexibly adapt to motors of different power. Surface mount devices can be used, which have a small board area, small size, light weight, and are easy to integrate and install. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit connection of the motor current detection and protection device of this utility model; Figure 2 This is a schematic diagram of the application of the motor current detection and protection device system of this utility model. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] Please refer to Figure 1 The motor current detection and protection device of this utility model includes an input interface J1, an input interface J2, a Hall effect current sensor U1, resistors R1, R2, R3, R4, and R5, capacitors C1 and C2, an operational amplifier U2, a comparator U3, a potentiometer W1, a resistor R5, a relay K1, a transistor Q1, a diode D1, an audible and visual alarm light H1, and an output interface J3. The Hall effect current sensor U1 is model CC6924SG, and its measurement range is any one of 20A, 30A, 40A, 50A, 65A, 75A, 80A, 100A, 125A, 150A, or 200A.

[0019] Input interfaces J1 and J2 are electrically connected to the signal input terminals of current sensing element U1. The inverting input terminal of operational amplifier U2 is electrically connected to one end of resistor R1, and the other end of resistor R1 is electrically connected to the first signal output pin of current sensing element U1. The non-inverting input terminal of operational amplifier U2 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to the second signal output pin of current sensing element U1. Resistor R2 and capacitor C2 are connected in parallel, and their two ends are electrically connected to the inverting input terminal and the output terminal of operational amplifier U2, respectively. Resistor R4 and capacitor C1 are connected in parallel, and their two ends are electrically connected to the non-inverting input terminal and system ground GND of operational amplifier U2, respectively. The output terminal of operational amplifier U2 is electrically connected to the signal input terminal of signal comparator U3.

[0020] Potentiometer W1 is electrically connected to the system power supply VCC and system ground GND, respectively. The sliding end of potentiometer W1 is the adjustment end of the threshold adjustment element W1. One end of resistor R5 is electrically connected to the system power supply VCC, and the other end is electrically connected to the output of signal comparator U3.

[0021] Relay K1 includes a coil K1A, a first contact K1B, and a second contact K1C. The base of transistor Q1 is electrically connected to the output of signal comparator U3; the collector of transistor Q1 is electrically connected to the negative terminal of the relay K1 coil; and the emitter of transistor Q1 is electrically connected to system ground GND. The positive terminal of the relay K1 coil is electrically connected to the system power supply VCC. The second contact K1C of relay K1 is connected in series with the audible and visual alarm lamp H1 between the system power supply VCC and system ground GND. The first contact K1B of relay K1 is electrically connected to the pins of output interface J3. The negative terminal of diode D1 is electrically connected to the positive terminal of relay coil K1A, and the positive terminal of diode D1 is electrically connected to the negative terminal of relay coil K1A.

[0022] Please refer to Figure 2 The device works in conjunction with the power supply and control module M2 and the motor M3 in the system: the power supply and control module M2 outputs motor power through the terminal and can provide three-phase AC, two-phase AC or DC power supply; the motor M3 can be an AC motor or a DC motor; the motor current detection and protection device M1 collects one phase current of the motor power supply through the J1 terminal and outputs it through the J2 terminal; the J3 terminal of the device M1 outputs a protection status signal, which is electrically connected to the X1 terminal of the power supply and control module M2.

[0023] In actual operation, the motor current enters the Hall effect current sensor U1 through terminal J1, is converted into a voltage signal, is conditioned by operational amplifier U2, and transmitted to signal comparator U3 for comparison with the protection threshold. When the current exceeds the threshold, the comparator outputs a high level, turning on transistor Q1, activating relay K1, and starting the audible and visual alarm H1. At the same time, terminal J3 outputs a protection signal. After receiving this signal, power supply and control module M2 immediately cuts off the power supply to the motor, and motor M3 stops running, thereby avoiding equipment damage or personal injury.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motor current detection and protection device, characterized in that, include: The system comprises an input interface, a current detection element U1, a signal comparator U3, a threshold adjustment element W1, an actuator, an alarm element H1, and an output interface. The input interface is electrically connected to the signal input terminal of the current detection element U1, for series connection to the motor power supply circuit. The signal output terminal of the current detection element U1 is electrically connected to the signal input terminal of the signal comparator U3. The two ends of the threshold adjustment element W1 are electrically connected to the system power supply VCC and system ground GND, respectively, and the adjustment terminal of the threshold adjustment element W1 is electrically connected to the threshold input terminal of the signal comparator U3. The output terminal of the signal comparator U3 is electrically connected to the control terminal of the actuator. The first execution terminal of the actuator is electrically connected to the alarm element H1, and the second execution terminal of the actuator is electrically connected to the output interface J3. The output interface J3 is used for electrical connection to an external motor power supply control module.

2. The motor current detection and protection device according to claim 1, characterized in that, The signal output terminal of the current sensing element U1 and the signal input terminal of the signal comparator U3 are electrically connected through a signal conditioning circuit. The signal conditioning circuit includes an operational amplifier U2, resistors R1, R2, R3, and R4, and capacitors C1 and C2. The inverting input terminal of the operational amplifier U2 is electrically connected to one end of resistor R1, and the other end of resistor R1 is electrically connected to the first signal output pin of the current sensing element U1. The non-inverting input terminal of the operational amplifier U2 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to the second signal output pin of the current sensing element U1. Resistor R2 and capacitor C2 are connected in parallel, and their two ends are electrically connected to the inverting input terminal and the output terminal of the operational amplifier U2, respectively. Resistor R4 and capacitor C1 are connected in parallel, and their two ends are electrically connected to the non-inverting input terminal and system ground GND, respectively. The output terminal of the operational amplifier U2 is electrically connected to the signal input terminal of the signal comparator U3.

3. The motor current detection and protection device according to claim 1, characterized in that, The actuator includes a transistor Q1 and a relay K1. The relay K1 includes a coil K1A, a first contact K1B, and a second contact K1C. The base of the transistor Q1 is electrically connected to the output of the signal comparator U3, the collector of the transistor Q1 is electrically connected to the negative terminal of the coil of the relay K1, and the emitter of the transistor Q1 is electrically connected to the system ground GND. The positive terminal of the coil of the relay K1 is electrically connected to the system power supply VCC. The second contact K1C of the relay K1 is connected in series with the alarm element H1 between the system power supply VCC and the system ground GND. The first contact K1B of the relay K1 is electrically connected to the pins of the output interface J3 in a one-to-one correspondence.

4. The motor current detection and protection device according to claim 3, characterized in that, When the coil K1A of relay K1 is energized, it drives the first contact K1B and the second contact K1C to close synchronously.

5. The motor current detection and protection device according to claim 1, characterized in that, It also includes a resistor R5, one end of which is electrically connected to the system power supply VCC, and the other end is electrically connected to the output of the signal comparator U3.

6. The motor current detection and protection device according to claim 1, characterized in that, It also includes a diode D1; the negative terminal of the diode D1 is electrically connected to the positive terminal of the relay coil K1A, and the positive terminal of the diode D1 is electrically connected to the negative terminal of the relay coil K1A.

7. The motor current detection and protection device according to claim 1, characterized in that, The current sensing element U1 is a Hall effect current sensor; the power supply terminal of the Hall effect current sensor U1 is electrically connected to the system power supply VCC, and the ground terminal of the Hall effect current sensor U1 is electrically connected to the system ground GND.

8. The motor current detection and protection device according to claim 1, characterized in that, The threshold adjustment element W1 is a potentiometer; the first fixed terminal of the potentiometer W1 is electrically connected to the system power supply VCC, the second fixed terminal of the potentiometer W1 is electrically connected to the system ground GND, and the sliding terminal of the potentiometer W1 is the adjustment terminal of the threshold adjustment element W1.

9. The motor current detection and protection device according to claim 1, characterized in that, The input interface includes input interface J1 and input interface J2, which are adapted to AC power supply circuits or DC power supply circuits.

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