Motor protector

Abstract

The utility model relates to the technical field of motor protectors, and particularly provides a motor protector, which comprises a shell, a panel and a bottom plate, the panel and the bottom plate are arranged in the shell; the panel comprises a chip; the bottom plate comprises a power supply, a relay, a mutual inductor and a current signal output unit; the power supply is connected with the chip, the relay and the current signal output unit; the chip is connected with the mutual inductor, the relay and the current signal output unit. The motor protector provided by the utility model is provided with the current signal output unit, so that signal transmission can be carried out without depending on additional signal transfer equipment, and remote monitoring and adjustment are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor protector technical field, especially a motor protector. BACKGROUND

[0002] Motor protector has overload protection, open-phase protection, underload protection, three-phase unbalance protection, power-on delay, automatic recovery and the like functions, and is an important accessory for normal operation of a motor.

[0003] With the application of programmable logic controller (PLC) in the field of industrial automation, motor protectors need to have current signal transmission function for remote monitoring and adjustment. However, the existing motor protectors do not have current signal transmission function and need to rely on additional signal relay equipment for signal transmission.

[0004] In view of the problem that the motor protector itself does not have current signal transmission function in the related art, no effective solution has been proposed so far. SUMMARY

[0005] The motor protector provided by the embodiment of the utility model solves at least the problem that the motor protector itself does not have current signal transmission function in the related art.

[0006] The motor protector provided by the embodiment of the utility model comprises a shell, a panel and a bottom plate; the panel and the bottom plate are arranged inside the shell;

[0007] The panel comprises a chip;

[0008] The bottom plate comprises a power supply, a relay, a mutual inductor and a current signal output unit;

[0009] The power supply is connected with the chip, the relay and the current signal output unit; the chip is connected with the mutual inductor, the relay and the current signal output unit.

[0010] The current signal output unit of the motor protector comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and a diode;

[0011] The first end of the first resistor is connected with the chip, and the second end of the first resistor is connected with the first end of the first capacitor;

[0012] The second end of the first capacitor is grounded;

[0013] The power supply end of the first operational amplifier is connected with the power supply, the grounding end of the first operational amplifier is grounded, the positive input end of the first operational amplifier is connected with the second end of the first resistor, the negative input end of the first operational amplifier is connected with the first end of the second resistor and the first end of the third resistor, and the output end of the first operational amplifier is connected with the second end of the third resistor, the first end of the fourth resistor and the first end of the fifth resistor.

[0014] The second end of the second resistor is grounded.

[0015] The second end of the fourth resistor is connected with the anode end of the diode.

[0016] The second end of the fifth resistor is connected with the anode end of the diode.

[0017] The first end of the sixth resistor is connected with the positive input end of the first operational amplifier, and the second end of the sixth resistor is connected with the negative input end and the output end of the second operational amplifier.

[0018] The power supply end of the second operational amplifier is connected with the power supply, the grounding end of the second operational amplifier is grounded, and the anode end of the second operational amplifier is connected with the anode end of the diode.

[0019] The cathode end of the diode is the output end of the current signal output unit.

[0020] The current signal output by the current signal output unit is 4-20mA.

[0021] The bottom plate further comprises a connecting terminal and an outgoing terminal.

[0022] The power supply is connected with the chip, the relay and the current signal output unit through the connecting terminal, and the chip is connected with the mutual inductor, the relay and the current signal output unit through the connecting terminal.

[0023] The input end of the power supply is connected with a live wire and a zero line through the outgoing terminal, the output end of the current signal output unit is connected with the outgoing terminal, and the output end of the relay is connected with the outgoing terminal.

[0024] The panel further comprises a number tube driving unit and a number tube, the number tube driving unit is connected with the chip and the power supply, and the number tube is connected with the number tube driving unit.

[0025] The utility model discloses an electric motor protector, the panel still includes the key unit, the key unit connects the chip.

[0026] The utility model discloses an electric motor protector, the panel still includes program burning mouth, program burning mouth connects the chip.

[0027] The utility model discloses an electric motor protector, the bottom plate still includes buzzer and second electric capacity, the first end of buzzer connects the chip, the second end of buzzer is grounded, and the second electric capacity is connected in parallel with buzzer.

[0028] The utility model discloses an electric motor protector, the power supply includes 12V power supply and 3.3V power supply.

[0029] The utility model discloses an electric motor protector, the shell is set up three holes, and the three phase lines of electric motor pass through three holes.

[0030] The utility model discloses an electric motor protector, solved the current signal transmission function of the electric motor protector itself not having of prior art, reached the technical effect of not needing to depend on additional signal relay equipment, and the remote monitoring and adjustment of being convenient for. DRAWINGS

[0031] The drawings explained here are used to provide further understanding of the present application, and constitute a part of the present application, the illustrative embodiment of the present application and its explanation are used to explain the present application, and do not constitute undue limitation to the present application.

[0032] Figure 1 It is the structure schematic diagram of an electric motor protector in the utility model embodiment.

[0033] Figure 2 It is the circuit structure diagram of current signal output unit in the utility model embodiment.

[0034] Figure 3 It is the circuit structure diagram of power supply in the utility model embodiment.

[0035] Figure 4 It is the structure schematic diagram of preferred electric motor protector in the utility model embodiment.

[0036] Figure 5 It is the schematic diagram of shell opening in the utility model embodiment.

[0037] Among them, the above-mentioned drawing includes following drawing marks:

[0038] R1 - first resistor; R2 - second resistor; R3 - third resistor; R4 - fourth resistor; R5 - fifth resistor; R6 - sixth resistor; C1 - first capacitor; D1 - diode; U1A - first operational amplifier; U1B - second operational amplifier; IOUT - output terminal of current signal output unit;

[0039] L - live wire; N - neutral wire; Tr1 - transformer assembly; U2 - voltage stabilizing module; Vin - input terminal of U2; GND - ground terminal of U2; Vout - output terminal of U2; E1 - first filter capacitor; E2 - second filter capacitor; C3 - third capacitor; C4 - fourth capacitor;

[0040] 10 - housing; 101 - B-phase live wire hole; 102 - A-phase live wire hole; 103 - C-phase live wire hole. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized specification where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] With the application of PLC in the field of industrial automation, the motor protector needs to have current signal transmission function in order to carry out remote monitoring and adjustment. However, the existing motor protector does not have current signal transmission function and needs to rely on additional signal relay equipment for signal transmission.

[0045] To this end, the embodiment of the present application provides a motor protector, please see Figure 1 As shown in the figure, including shell, panel and bottom plate; Panel and bottom plate are arranged in the shell inside;

[0046] The panel includes a chip;

[0047] The bottom plate includes a power supply, a relay, a mutual inductor, a current signal output unit;

[0048] The power supply is connected with the chip, the relay and the current signal output unit; The chip is connected with the mutual inductor, the relay and the current signal output unit.

[0049] The motor protector provided by the embodiment of the present application is configured with a current signal output unit, can transmit current signal, and is convenient for remote monitoring and adjustment.

[0050] Next, a motor protector provided by the embodiment of the present application will be described in detail:

[0051] Optionally, please see Figure 2 As shown in the figure, the current signal output unit includes a first operational amplifier U1A, a second operational amplifier U2A, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1 and a diode D1;

[0052] The first end of the first resistor R1 is connected with the chip, and the second end of the first resistor R1 is connected with the first end of the first capacitor C1; The second end of the first capacitor C1 is grounded;

[0053] The power supply end of the first operational amplifier U1A is connected with the power supply, the ground end of the first operational amplifier U1A is grounded, the positive input end of the first operational amplifier U1A is connected with the second end of the first resistor R1, the negative input end of the first operational amplifier U1A is connected with the first end of the second resistor R2 and the first end of the third resistor R3, and the output end of the first operational amplifier U1A is connected with the second end of the third resistor R3, the first end of the fourth resistor R4 and the first end of the fifth resistor R5;

[0054] The second end of the second resistor R2 is grounded;

[0055] The second end of the fourth resistor R4 is connected with the positive end of the diode C1;

[0056] The second end of the fifth resistor R5 is connected with the positive end of the diode C1;

[0057] The first end of the sixth resistor R6 is connected with the positive input end of the first operational amplifier U1A, and the second end of the sixth resistor R6 is connected with the negative input end and the output end of the second operational amplifier U1B;

[0058] The power supply end of the second operational amplifier U1B is connected to a power supply, the ground end of the second operational amplifier U1B is grounded, and the positive end of the second operational amplifier U1B is connected to the positive end of the diode C1.

[0059] The negative end of the diode C1 is the output end IOUT of the current signal output unit.

[0060] Preferably, the current signal output by the current signal output unit is 4-20mA.

[0061] The 4-20mA current signal has strong anti-interference ability in the transmission process and is not easily affected by voltage source voltage drop, which can reduce the occurrence of signal loss; the lower limit 4mA can be used as a live zero point to facilitate monitoring whether the line is disconnected or other problems occur; the upper limit 20mA can prevent the generation of an electric spark sufficient to cause damage in a dangerous environment, thereby improving safety.

[0062] Exemplarily, the 4-20mA current signal is taken as the output target of the current signal output unit, and each element is configured as:

[0063] The chip inputs a 20mA current to the first end of the first resistor R1, the resistance value of the first resistor R1 is 200kΩ, the resistance value of the second resistor R2 is 200kΩ, the resistance value of the third resistor R3 is 20kΩ, the resistance value of the fourth resistor R4 is 15kΩ, the resistance value of the fifth resistor R5 is 1MΩ, the resistance value of the sixth resistor R6 is 20kΩ, the capacitance value of the first capacitor C1 is 0.1μF, and the first operational amplifier U1A and the second operational amplifier U1B adopt one LM358.

[0064] The LM358 is a double operational amplifier, and internally includes two independent, high-gain, and internal frequency compensation operational amplifiers, so one LM358 can be used.

[0065] Optionally, the chip is an STM32 series chip.

[0066] Optionally, in the motor protector provided in the embodiment of the present application, the power supply includes a 12V power supply and a 3.3V power supply, please refer to Figure 3 .

[0067] The input end of the voltage transformation component Tr1 is connected with the live wire L and the neutral wire N, the positive output end of the voltage transformation component Tr1 is connected with the input end Vin of the voltage stabilizing module U2, and the negative output end of the voltage transformation component Tr1 is grounded; the positive end of the first filter capacitor E1 is connected with the input end Vin of the voltage stabilizing module U2, and the negative end of the first filter capacitor E1 is grounded; the third capacitor C3 is connected with the first filter capacitor E1 in parallel; the grounding end GND of the voltage stabilizing module U2 is grounded, and the output end Vout of the voltage stabilizing module U2 is connected with the positive end of the second filter capacitor E2; the negative end of the second filter capacitor E2 is grounded; the fourth capacitor C4 is connected with the second filter capacitor E2 in parallel.

[0068] Exemplarily, aiming at providing +12V power supply at the positive output end of the voltage transformation component Tr1 and +3.3V power supply at the output end of the voltage stabilizing module U2, the components are configured as follows:

[0069] The 220V power supply is provided through the live wire L and the neutral wire N, the voltage transformation component Tr1 adopts the BCY-432 series transformer, the voltage stabilizing module U2 adopts the LD1117 series voltage stabilizer, the capacitance value of the first filter capacitor E1 is 470μF, the capacitance value of the second filter capacitor E2 is 220μF, the capacitance value of the third capacitor C3 is 0.1μF, and the capacitance value of the fourth capacitor C4 is 0.1μF.

[0070] The third capacitor C3 is connected with the first filter capacitor E1 in parallel, and the fourth capacitor C4 is connected with the second filter capacitor E2 in parallel, so as to smooth the voltage fluctuation and improve the circuit stability and anti-interference capability.

[0071] Preferably, the bottom plate further comprises a connection terminal and an outlet terminal;

[0072] The power supply is connected with the chip, the relay and the current signal output unit through the connection terminal, and the chip is connected with the mutual inductor, the relay and the current signal output unit through the connection terminal;

[0073] The input end of the power supply is connected with the live wire and the neutral wire through the outlet terminal, the output end of the current signal output unit is connected with the outlet terminal, and the output end of the relay is connected with the outlet terminal.

[0074] The connection terminal and the outlet terminal both provide a plurality of common interfaces, so that the circuit wiring is more flexible.

[0075] Optionally, referring to FIG. 1, Figure 4 The panel further comprises a nixie tube driving unit and a nixie tube, the nixie tube driving unit is connected with the chip and the power supply, and the nixie tube is connected with the nixie tube driving unit.

[0076] In the working process, the chip outputs signals to the nixie tube driving unit, the nixie tube driving unit outputs signals to the nixie tube, and the nixie tube displays the state information of the protected motor and the parameter information of the motor protector.

[0077] Optionally, the panel further comprises a key unit, the key unit being connected to the chip.

[0078] The working parameters of the motor protector can be adjusted through the key unit.

[0079] Optionally, the panel further comprises a program burning port, the program burning port being connected to the chip.

[0080] The built-in program of the chip can be modified and edited through the program burning port.

[0081] Optionally, the bottom plate further comprises a buzzer and a second capacitor, a first end of the buzzer being connected to the chip, a second end of the buzzer being grounded, and the second capacitor being connected in parallel to the buzzer.

[0082] The buzzer sounds an alarm in the case that the protected motor is in an abnormal state.

[0083] Optionally, the shell is provided with three holes, and the three phase lines of the motor pass through the three holes.

[0084] Please refer to Figure 5 Fig. 1, the ABC three-phase lines of the motor pass through the A-phase line hole 102, the B-phase line hole 101 and the C-phase line hole 103 of the shell 10 so as to be detected by the current transformer; wherein the motor protector monitors the current of the secondary side of the current transformer.

[0085] Exemplarily, the current ratio of the current transformer is set to be 0-5A.

[0086] For the convenience of description, spatial relative terms such as "above", "upper", "top", "up", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0087] In addition, it should be noted that the use of "first", "second", and the like words to qualify elements is merely intended to distinguish the respective elements from one another, and does not have a special meaning unless otherwise stated. Therefore, these words should not be interpreted as limiting the scope of protection of the present application.

[0088] The preferred embodiments of the present application have been described above with the help of drawings. However, for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A motor protector, characterized in that, It includes an outer shell, a front panel, and a bottom plate; both the front panel and the bottom plate are disposed inside the outer shell; The panel includes a chip; The base plate includes a power supply, a relay, a current transformer, and a current signal output unit; The power supply is connected to the chip, the relay, and the current signal output unit; the chip is connected to the current transformer, the relay, and the current signal output unit.

2. The motor protector according to claim 1, characterized in that, The current signal output unit includes a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, and a diode; The first end of the first resistor is connected to the chip, and the second end of the first resistor is connected to the first end of the first capacitor. The second terminal of the first capacitor is grounded; The power supply terminal of the first operational amplifier is connected to the power supply, the ground terminal of the first operational amplifier is grounded, the positive input terminal of the first operational amplifier is connected to the second terminal of the first resistor, the negative input terminal of the first operational amplifier is connected to the first terminal of the second resistor and the first terminal of the third resistor, and the output terminal of the first operational amplifier is connected to the second terminal of the third resistor, the first terminal of the fourth resistor and the first terminal of the fifth resistor. The second terminal of the second resistor is grounded; The second end of the fourth resistor is connected to the positive terminal of the diode; The second end of the fifth resistor is connected to the positive terminal of the diode; The first end of the sixth resistor is connected to the positive input terminal of the first operational amplifier, and the second end of the sixth resistor is connected to the negative input terminal and the output terminal of the second operational amplifier. The power supply terminal of the second operational amplifier is connected to the power supply, the ground terminal of the second operational amplifier is grounded, and the positive terminal of the second operational amplifier is connected to the positive terminal of the diode; The negative terminal of the diode is the output terminal of the current signal output unit.

3. The motor protector according to claim 2, characterized in that, The current signal output by the current signal output unit is 4-20mA.

4. The motor protector according to claim 1, characterized in that, The base plate also includes connection terminals and outgoing terminals; The power supply is connected to the chip, the relay, and the current signal output unit through the connection terminal; the chip is connected to the current transformer, the relay, and the current signal output unit through the connection terminal. The input terminal of the power supply is connected to the live wire and the neutral wire through the output terminal, the output terminal of the current signal output unit is connected to the output terminal, and the output terminal of the relay is connected to the output terminal.

5. The motor protector according to claim 1, characterized in that, The panel also includes a digital tube driver unit and a digital tube. The digital tube driver unit is connected to the chip and the power supply, and the digital tube is connected to the digital tube driver unit.

6. The motor protector according to claim 5, characterized in that, The panel also includes a button unit, which is connected to the chip.

7. The motor protector according to claim 1, characterized in that, The panel also includes a programming port, which is connected to the chip.

8. The motor protector according to claim 1, characterized in that, The base plate also includes a buzzer and a second capacitor. The first end of the buzzer is connected to the chip, the second end of the buzzer is grounded, and the second capacitor is connected in parallel with the buzzer.

9. The motor protector according to claim 1, characterized in that, The power supply includes a 12V power supply and a 3.3V power supply.

10. The motor protector according to claim 1, characterized in that, The housing has three holes through which the three phase wires of the motor pass.

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