CN210577766U - Circuit protection device of three-phase motor - Google Patents
Circuit protection device of three-phase motor Download PDFInfo
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- CN210577766U CN210577766U CN201922006711.0U CN201922006711U CN210577766U CN 210577766 U CN210577766 U CN 210577766U CN 201922006711 U CN201922006711 U CN 201922006711U CN 210577766 U CN210577766 U CN 210577766U
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Abstract
The utility model discloses a three phase machine's circuit protection device, including three phase machine, first rectifier bridge circuit, second rectifier bridge circuit, first relay, second relay and control circuit, three phase machine includes input circuit, second way input circuit and third way input circuit all the way, first relay includes first relay coil, a plurality of first normally open switch and first normally closed switch, first relay coil is connected with first normally open switch and first normally closed switch electricity respectively and is carried out reverse operation, the second relay includes second relay coil and two second normally closed switches, second relay coil is connected with second normally closed switch electricity and is carried out reverse operation, control circuit includes first normally open inching button and second normally closed inching button. The utility model discloses a circuit protection device of three-phase motor, control circuit is simple, and control circuit maintains, checks comparatively simply.
Description
Technical Field
The utility model relates to an electrical circuit, in particular to circuit protection device of three-phase motor.
Background
The three-phase motor is one of induction motors, and is a type of motor powered by simultaneously connecting 220V three-phase alternating current. When the three-phase motor is used as a power device to drive other devices, a phase-lacking operation fault occurs, after the three-phase motor operates for a certain period of time, insulation of a stator winding may be aged (the ambient temperature of the motor during operation is too high for a long time, the power supply voltage is too high or the load is too large), so that the phase or turn-to-turn short circuit of the stator winding of the motor is caused, and the stator winding of the motor is also disconnected by one phase or multiple phases. However, the existing three-phase motor operation protection device has a complex circuit and a complex control circuit maintenance and troubleshooting, and a new technical scheme is necessary to be provided for the defects of the prior art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a circuit protection device of three-phase motor, control circuit is simple, and control circuit maintains, checks comparatively simply.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a circuit protection device of a three-phase motor comprises the three-phase motor, a first rectifier bridge circuit, a second rectifier bridge circuit, a first relay, a second relay and a control circuit, wherein the three-phase motor comprises a first path of input circuit, a second path of input circuit and a third path of input circuit, the first relay comprises a first relay coil, a plurality of first normally open switches and a first normally closed switch, the first relay coil is respectively and electrically connected with the first normally open switches and the first normally closed switch to carry out reverse operation, the second relay comprises a second relay coil and a second normally closed switch, the second relay coil is electrically connected with the second normally closed switch to carry out reverse operation, the control circuit comprises a first normally open inching button and a second normally closed inching button, one end of the first normally open inching button is connected with the input end of the first path of input circuit, the other end of the first normally open inching button is sequentially connected in series with one end of a second normally closed inching button, a second normally closed switch and a first relay coil, the other end of the first relay coil is connected with a third input circuit, two ends of the first normally open inching button are connected with a first normally open switch in parallel, the first input circuit, the second input circuit and the third input circuit are all connected with a first normally open switch, the three-way input end of the first rectifier bridge circuit is respectively connected with the input ends of the first normally open switches of the first, second and third input circuits, the three-way input end of the second rectifier bridge is connected with the output ends of the first normally open switches of the first, second and third input circuits, and a second relay coil and a first normally open switch are connected in series between the first rectifier bridge circuit and the second rectifier bridge circuit.
Furthermore, a first fuse is connected in series between the input ends of the first input circuit, the second input circuit and the third input circuit and the respective first normally open switches.
Furthermore, the first rectifier bridge circuit and the second rectifier bridge circuit both comprise a first rectifier diode and a second rectifier diode, an anode of the first rectifier diode and a cathode of the second rectifier diode are connected in series to form a rectifier assembly, the first rectifier bridge circuit and the second rectifier bridge circuit respectively comprise three rectifier assemblies, cathodes of first rectifier diodes in the six rectifier assemblies are connected in parallel, and a second relay coil and a first normally open switch are connected in series between an anode of the second rectifier diode in the first rectifier bridge circuit and an anode of the second rectifier diode in the second rectifier bridge circuit.
Further, the input end of the first normally open inching button is connected with a second fuse in series.
By adopting the technical scheme, when the three-phase motor runs, an operator starts the first normally open inching button, the first relay coil is electrified to control the second normally open switches connected in parallel at two ends of the first normally open inching button to be operated in reverse, the control circuits are electrified to operate, the first input circuit, the second input circuit and the third input circuit are all connected with the first normally open switches to be operated in reverse and closed, the first normally open switch connected in series between the first rectifier bridge circuit and the second rectifier bridge circuit is operated in reverse and closed, the three-phase motor is in a normal operation state, at the moment, no voltage difference exists at the connecting point connected in series between the first rectifier bridge circuit and the second rectifier bridge circuit, the second relay coil does not operate, but when the three-phase motor has a phase-failure, the output voltage of the output end of the first rectifier bridge circuit is unchanged, the output voltage of the second rectifier bridge circuit is reduced, there is the voltage difference in the tie point of establishing ties between first rectifier bridge circuit and the second rectifier bridge circuit, and the second relay coil gets the reverse operation of the second normally closed switch among the electric control circuit and opens, and first relay coil loses the electricity, and the first normally open switch of input circuit, second way input circuit and third route input circuit of the first way resumes normally open state outage, and three-phase machine shuts down, obtains effective protection when lacking the looks, and this control circuit maintains, checks comparatively simply.
Drawings
FIG. 1 is an electrical schematic diagram of the present invention;
fig. 2 is a circuit diagram of the connection between the rectifier bridges according to the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-2, the utility model discloses a circuit protection device of three-phase motor, including three-phase motor M1, first rectifier bridge circuit 1, second rectifier bridge circuit 2, first relay, second relay and control circuit 3, three-phase motor M1 includes input circuit 11 all the way, second input circuit 12 and third input circuit 13, first relay includes first relay coil KM1, a plurality of first normally open switches KMO1 and first normally closed switch KMC1, first relay coil KM1 is connected with first normally open switch KMO1 and first normally closed switch KMC1 electricity respectively and is carried out reverse operation, the second relay includes second relay coil KM2 and second normally closed switch KMC1, second relay coil KM2 is connected with second normally closed switch KMC1 electricity and is carried out reverse operation, control circuit 3 includes first normally open button SB1 and second normally closed button SB2, one end of a first normally open inching button SB1 is connected with the input end of a first path of input circuit 11, the other end of the first normally open inching button SB1 is sequentially connected in series with one end of a second normally closed inching button SB2, a second normally closed switch KMC1 and a first relay coil KM1, the other end of the first relay coil KM1 is connected with a third path of input circuit 13, two ends of the first normally open inching button SB1 are connected with a first normally open switch KMO1 in parallel, the first path of input circuit 11, the second path of input circuit 12 and the third path of input circuit 13 are all connected with the first normally open switch KMO1, three path input ends of a first rectifier bridge circuit 1 are respectively connected with the input ends of a first normally open switch KMO1 of the first path of input circuit 11, the second path of input circuit 12 and the third path of input circuit 13, three path input ends of a second rectifier bridge are connected with the output ends of the first normally open switch KMO1 of the first path of input, a second relay coil KM2 and a first normally open switch KMO1 are connected in series between the first rectifier bridge circuit 1 and the second rectifier bridge circuit 2. When the three-phase motor M1 is in operation, an operator starts a first normally open jog button SB1, a first relay coil KM1 is electrified to control a second normally open switch connected in parallel with two ends of the first normally open jog button SB1 to be operated in a reverse direction, a control circuit 3 is electrified to operate, a first input circuit 11, a second input circuit 12 and a third input circuit 13 are connected with a first normally open switch KMO1 to be operated in a reverse direction and closed, a first normally open switch KMO1 connected in series between a first rectifier bridge circuit 1 and a second rectifier bridge circuit 2 is operated in a reverse direction and closed, the three-phase motor M1 is in a normal operation state, at the moment, no voltage difference exists at a connecting point connected in series between the first rectifier bridge circuit 1 and the second rectifier bridge circuit 2, the second relay coil KM2 is not operated, but when a phase failure occurs to the three-phase motor M1, the output voltage at the output end of the first rectifier bridge circuit 1 is unchanged, the output voltage of the second rectifier bridge circuit 2 is reduced, there is the voltage difference in the tie point of establishing ties between first rectifier bridge circuit 1 and the second rectifier bridge circuit 2, second relay coil KM2 gets the second normally closed switch KMC1 reverse operation among the electric control circuit 3 and opens, first relay coil KM1 loses the electricity, input circuit 11 all the way, the first normally open switch KMO1 of second input circuit 12 and third input circuit 13 of second way resumes normally open state outage, three-phase machine M1 shuts down, obtain effective protection when lacking the looks, this control circuit 3 maintains, it is comparatively simple to investigate.
In addition, a first fuse FU1 is connected in series among the input ends of the first input circuit 11, the second input circuit 12 and the third input circuit 13 and respective first normally-open switches KMO1, a second fuse FU2 is connected in series at the input end of the first normally-open jog button SB1, two fuses are fused when overcurrent loads occur to a plurality of input circuits and control circuits of the three-phase motor, the motor and the control circuits stop operating, and the three-phase motor and the control circuits are effectively protected.
The first rectifier bridge circuit 1 and the second rectifier bridge circuit both comprise a first rectifier diode D1 and a second rectifier diode D2, the anode of the first rectifier diode D1 and the cathode of the second rectifier diode D2 are connected in series to form a rectifier assembly, the first rectifier bridge circuit 1 and the second rectifier bridge circuit respectively comprise three rectifier assemblies, the cathodes of the first rectifier diode D1 in the six rectifier assemblies are connected in parallel, the anode of the second rectifier diode D2 in the first rectifier bridge circuit 1 and the anode of the second rectifier diode D2 in the second rectifier bridge circuit 2 are connected in series with a second relay coil KM2 and a first normally open switch KMO1, voltage sampling is carried out by adopting two electronic rectifier bridges to effectively provide the reaction speed of the two relays, and the motor circuit is protected in time.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (4)
1. A circuit protection device of a three-phase motor is characterized in that: the three-phase motor comprises a three-phase motor, a first rectifier bridge circuit, a second rectifier bridge circuit, a first relay, a second relay and a control circuit, wherein the three-phase motor comprises a first path of input circuit, a second path of input circuit and a third path of input circuit, the first relay comprises a first relay coil, a plurality of first normally open switches and a first normally closed switch, the first relay coil is respectively electrically connected with the first normally open switches and the first normally closed switch to perform reverse operation, the second relay comprises a second relay coil and a second normally closed switch, the second relay coil is electrically connected with the second normally closed switch to perform reverse operation, the control circuit comprises a first normally open inching button and a second normally closed inching button, one end of the first normally open inching button is connected with the input end of the first path of input circuit, the other end of the first normally open inching button is sequentially connected in series and the second normally closed inching button to perform reverse operation, The touch control circuit comprises a first normally-closed switch, a second normally-closed switch and one end of a first relay coil, wherein the other end of the first relay coil is connected with a third path of input circuit, two ends of the first normally-open inching button are connected with the first normally-open switch in parallel, the first path of input circuit, the second path of input circuit and the third path of input circuit are all connected with the first normally-open switch, three paths of input ends of a first rectifier bridge circuit are respectively connected with input ends of the first normally-open switches of the first path of input circuit, the second path of input circuit and the third path of input circuit, three paths of input ends of a second rectifier bridge are connected with output ends of the first normally-open switches of the first path of input circuit, the second path of input circuit and the third path of input circuit, and a second relay coil and the first normally-open switch are connected in series between.
2. The circuit protection device for a three-phase motor according to claim 1, wherein: and a first fuse is connected in series between the input ends of the first input circuit, the second input circuit and the third input circuit and the respective first normally open switches.
3. The circuit protection device for a three-phase motor according to claim 1, wherein: the first rectifier bridge circuit and the second rectifier bridge circuit both comprise a first rectifier diode and a second rectifier diode, the anode of the first rectifier diode and the cathode of the second rectifier diode are connected in series to form a rectifier assembly, the first rectifier bridge circuit and the second rectifier bridge circuit respectively comprise three rectifier assemblies, the cathodes of the first rectifier diodes in the six rectifier assemblies are connected in parallel, and a second relay coil and a first normally open switch are connected in series between the anode of the second rectifier diode in the first rectifier bridge circuit and the anode of the second rectifier diode in the second rectifier bridge circuit.
4. The circuit protection device for a three-phase motor according to claim 1, wherein: and the input end of the first normally open inching button is connected with a second fuse in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922006711.0U CN210577766U (en) | 2019-11-19 | 2019-11-19 | Circuit protection device of three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922006711.0U CN210577766U (en) | 2019-11-19 | 2019-11-19 | Circuit protection device of three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210577766U true CN210577766U (en) | 2020-05-19 |
Family
ID=70660694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922006711.0U Expired - Fee Related CN210577766U (en) | 2019-11-19 | 2019-11-19 | Circuit protection device of three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210577766U (en) |
-
2019
- 2019-11-19 CN CN201922006711.0U patent/CN210577766U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200519 Termination date: 20201119 |