CN218526078U - Intelligent protector for three-phase motor - Google Patents
Intelligent protector for three-phase motor Download PDFInfo
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- CN218526078U CN218526078U CN202222569806.5U CN202222569806U CN218526078U CN 218526078 U CN218526078 U CN 218526078U CN 202222569806 U CN202222569806 U CN 202222569806U CN 218526078 U CN218526078 U CN 218526078U
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Abstract
The utility model provides an intelligent protector for a three-phase motor, which comprises a working power circuit, wherein the working power circuit comprises a rectification circuit, a voltage reduction circuit and a voltage stabilizing circuit; the rectifying circuit comprises a rectifying block D1 and a rectifying block D2, a first alternating current input end of the rectifying block D1 is connected with any phase in the three-phase input electricity, a second alternating current input end of the rectifying block D2 is connected with any phase in the remaining two phases in the three-phase input electricity after being connected with the first alternating current input end of the rectifying block D2, and a second alternating current input end of the rectifying block D2 is connected with the last phase in the three-phase input electricity; the direct current output ends of the rectification block D1 and the rectification block D2 are connected in parallel to form the output of the rectification circuit. The utility model discloses in, motor intelligent protection ware's working power supply adopts and lacks under the condition of arbitrary looks in U, V, the W three-phase, still can normally provide +12VDC, +5VDC power, guarantees that motor intelligent protection ware can also work when lacking arbitrary looks.
Description
Technical Field
The utility model relates to a motor work protection field, especially a three-phase motor intelligent protection ware.
Background
Three-phase motor products such as: the motor such as an air compressor, a fan, a water pump, a hydraulic press and the like has wide application range and strong practicability. However, most three-phase motor protectors on the market use temperature protection and open-phase protection, but in the practical application process, the physical protection measures cannot avoid the burn-in phenomenon of the three-phase motor in the use process.
Therefore, the intelligent protector for the three-phase motor is provided in the industry, various protective measures are pertinently made according to the problems of phase sequence error, phase loss, unbalanced current, overload, unstable voltage and the like of three-phase input in use of the three-phase motor in the current market by utilizing the software operation function of a main control chip, the three-phase motor can be normally used in different working environments, and the three-phase motor is prevented from being burnt and damaged under the condition of meeting extreme conditions in different environments. However, the three-phase motor intelligent protector includes various intelligent chips such as a processor and a memory, and the intelligent chips require an operating power supply when operating, and the input of 380VAC as a three-phase motor is required to be converted into a 12V dc power supply intelligent chip for use. At present, the working power supply of the intelligent protector is taken from any phase 380VAC of U, V and W, and is rectified and filtered to form direct current. However, if only one phase (for example, the U phase) is short of power and the other two phases are power, the intelligent protector stops working and cannot protect the three-phase motor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a three-phase motor intelligent protector, this motor intelligent protector's working power supply adopt U, V, W three-phase lack under the arbitrary looks condition, still can normally provide +12VDC, +5VDC power.
The utility model discloses a realize that the technical scheme that its technical objective adopted is: an intelligent protector for a three-phase motor comprises a working power supply circuit, wherein the working power supply circuit comprises a rectifying circuit, a voltage reducing circuit and a voltage stabilizing circuit; the rectifying circuit comprises a rectifying block D1 and a rectifying block D2, a first alternating current input end of the rectifying block D1 is connected with any phase in the three-phase input electricity, a second alternating current input end of the rectifying block D2 is connected with any phase in the remaining two phases in the three-phase input electricity after being connected with the first alternating current input end of the rectifying block D2, and a second alternating current input end of the rectifying block D2 is connected with the last phase in the three-phase input electricity; the direct current output ends of the rectifying block D1 and the rectifying block D2 are connected in parallel to form the output of the rectifying circuit.
Further, in the above three-phase motor intelligent protector: the device comprises a protection control circuit, wherein the protection control circuit controls the working state of the motor to comprise positive rotation and sudden stop.
Further, among the aforesaid three-phase motor intelligent protection ware: the motor protection device also comprises a voltage protection module, wherein the voltage detected during the operation of the motor is protected when the voltage is out of the range of the specified interval.
Further, among the aforesaid three-phase motor intelligent protection ware: the motor protection device also comprises an overcurrent and overload protection module, and the motor protection device is used for protecting the motor after the detected current exceeds a set value in the running process.
Further, among the aforesaid three-phase motor intelligent protection ware: the motor protection device further comprises a current balance protection module, the current of the three live wires is detected during the operation of the motor, and when the current balance degree of the three live wires is larger than a set gear, protection is carried out.
Further, among the aforesaid three-phase motor intelligent protection ware: the motor phase-loss protection circuit also comprises a phase-loss protection module, wherein each phase of current is detected during the operation of the motor, and protection is carried out if a certain phase of current is zero.
Further, among the aforesaid three-phase motor intelligent protection ware: the system also comprises an input phase sequence protection module which is used for protecting when 3 live wires are connected into the L1, the L2 and the L3, and the phase sequence is wrong.
The utility model discloses in, motor intelligent protection ware's working power supply adopts and lacks under the condition of arbitrary looks in U, V, the W three-phase, still can normally provide +12VDC, +5VDC power, guarantees that motor intelligent protection ware can also work when lacking arbitrary looks.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic block diagram of an intelligent motor protector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a working power supply circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a phase-loss circuit according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the present embodiment is a three-phase motor intelligent protector, which utilizes the software operation function of the main control chip, and makes various protective measures according to the problems of phase sequence error, phase loss, unbalanced current, overload, unstable voltage and the like of three-phase input in the use of the three-phase motor in the current market, so that the three-phase motor can be normally used in different working environments, and the three-phase motor can be prevented from being burnt under the extreme conditions in different environments. In the phase embodiment, the three-phase alternating current of the motor is mainly detected by adopting a voltage detection mode and a current detection mode, and then each phase current and voltage are detected and judged and protected according to the regulations.
The working power supply circuit is shown in fig. 2, and comprises a rectifying circuit, a voltage reducing circuit and a voltage stabilizing circuit; the rectifying circuit comprises a rectifying block D1 and a rectifying block D2, a first alternating current input end of the rectifying block D1 is connected with any phase in three-phase input electricity, a second alternating current input end of the rectifying block D2 is connected with any phase in the remaining two phases in the three-phase input electricity after being connected with the first alternating current input end of the rectifying block D2, and a second alternating current input end of the rectifying block D2 is connected with the last phase in the three-phase input electricity; the direct current output ends of the rectifying block D1 and the rectifying block D2 are connected in parallel to form the output of the rectifying circuit. And then the voltage is reduced and stabilized, and the 12VDC stabilized voltage is output to supply power for intelligent chips such as a processor. As shown in fig. 2, any 380VAC is rectified by the rectifier module, then is subjected to voltage reduction and stabilization, and finally forms 12VDC, and in the voltage stabilizing circuit, an optocoupler is adopted for negative feedback, so that the output is more stable.
In this embodiment, the three-phase motor intelligent protector has the following protection module:
and in the voltage protection module, the voltage detected in the motor operation is out of the interval range, 4 seconds later, the voltage protection function is started, and the motor stops operating. The motor needs to be recovered to normal operation by manually turning off and on the motor.
The overcurrent and overload protection module can set current protection parameters, detects the magnitude of each phase current, and performs protection when the magnitude of each phase current is greater than a specified value, a current detection circuit adopts a mutual inductor L50 for measurement as shown in figure 3, then a sampling circuit consisting of a resistor R50, a diode D50 and a diode D51 is input into a processor, and whether protection is performed or not is judged and controlled in the processor.
And current balance protection, wherein each phase of current is measured by using a current transformer, 4 gears are arranged, namely 12.5%,18.75%,25% and 31.25%, when the current balance degree is greater than a selected gear in 4 gears, the motor runs for 4 seconds, the balance protection is started, and the motor is stopped.
And (4) open-phase protection, wherein when the current of any live wire is 0, the open-phase protection is started, and the motor is stopped.
The protection of input phase sequence when 3 live wires access the phase sequence mistake that appears, avoids the long-term reversal operation of motor, burns out under the fan cooling condition of lacking.
In this embodiment, the processor protects the three-phase motor by using relays arranged on the phase lines, and the relays are used to disconnect or connect the three-phase motor. As shown in fig. 4, the control of whether power is added to the coils of different relays to realize whether to pull in the relay includes a protection control circuit, and the protection control circuit controls the working state of the motor to include positive rotation, negative rotation and sudden stop. As shown in figure 4, when K1, K2 and K4 are closed, the three-phase motor rotates forwards, when K1, K3 and K6 are closed, the three-phase motor rotates backwards, and when K5 is closed, emergency shutdown protection is carried out.
Claims (7)
1. An intelligent protector for three-phase motor is composed of a working power supply circuit consisting of rectifier, voltage-reducing circuit and voltage-stabilizing circuit; the method is characterized in that: the rectifying circuit comprises a rectifying block D1 and a rectifying block D2, a first alternating current input end of the rectifying block D1 is connected with any phase in the three-phase input electricity, a second alternating current input end of the rectifying block D2 is connected with any phase in the remaining two phases in the three-phase input electricity after being connected with the first alternating current input end of the rectifying block D2, and a second alternating current input end of the rectifying block D2 is connected with the last phase in the three-phase input electricity; the direct current output ends of the rectification block D1 and the rectification block D2 are connected in parallel to form the output of the rectification circuit.
2. The intelligent protector for three-phase motors of claim 1, wherein: the device comprises a protection control circuit, wherein the protection control circuit controls the working state of the motor to comprise positive rotation and sudden stop.
3. The intelligent protector for three-phase motors of claim 1, wherein: the motor protection device also comprises a voltage protection module, wherein the voltage detected during the operation of the motor is protected when the voltage is out of the range of the specified interval.
4. The intelligent protector for three-phase motors of claim 1, wherein: the motor protection device also comprises an overcurrent and overload protection module, and the motor protection device is used for protecting the motor after the detected current exceeds a set value in the running process.
5. The intelligent protector for three-phase motor according to claim 1, wherein: the motor protection device also comprises a current balance protection module, the current of the three live wires is detected during the operation of the motor, and the protection is carried out when the current balance degree of the three live wires is greater than a set gear.
6. The intelligent protector for three-phase motors of claim 1, wherein: the motor phase-loss protection circuit also comprises a phase-loss protection module, wherein each phase of current is detected during the operation of the motor, and protection is carried out if a certain phase of current is zero.
7. The intelligent protector for three-phase motors of claim 1, wherein: the system further comprises an input phase sequence protection module which is used for protecting when 3 live wires are connected into the L1, the L2 and the L3, and the phase sequence is wrong.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222569806.5U CN218526078U (en) | 2022-09-26 | 2022-09-26 | Intelligent protector for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222569806.5U CN218526078U (en) | 2022-09-26 | 2022-09-26 | Intelligent protector for three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218526078U true CN218526078U (en) | 2023-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222569806.5U Active CN218526078U (en) | 2022-09-26 | 2022-09-26 | Intelligent protector for three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218526078U (en) |
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2022
- 2022-09-26 CN CN202222569806.5U patent/CN218526078U/en active Active
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