CN206806986U - A kind of safety device of three-phase squirrel-cage induction motor - Google Patents
A kind of safety device of three-phase squirrel-cage induction motor Download PDFInfo
- Publication number
- CN206806986U CN206806986U CN201720578737.0U CN201720578737U CN206806986U CN 206806986 U CN206806986 U CN 206806986U CN 201720578737 U CN201720578737 U CN 201720578737U CN 206806986 U CN206806986 U CN 206806986U
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- CN
- China
- Prior art keywords
- fuses
- connection
- relay
- photoelectricity
- open contacts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Fuses (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
A kind of safety device of three-phase squirrel-cage induction motor, including control circuit, control circuit includes 3V dc sources, 3V dc sources, S switches, resistance R, photoelectricity LED1 and photoelectricity LED2 series connection, 3V dc sources, KM1 relay coils, the series connection of phototriode V and GND earth terminal, photoelectricity LED2 and phototriode V composition optical coupling devices；The U of three-phase alternating current is connected FU fuses in main circuit, FU fuses connect the normally-closed contact of FR electrothermal relays, the normally-closed contact connection KM1 relay normally open contacts of FR electrothermal relays, KM1 relay normally open contacts connection FU1 fuses, FU1 fuses connect the V phases of three-phase alternating current；Thoroughly made by optical coupling device control circuit actuating section and main circuit without electrical connection, make starting switch S safer, reached the purpose of vulnerabilities scan forceful electric power, simultaneously because the presence of optical coupling device, makes the anti-interference of circuit stronger.During motor start-up, stop when being effectively protected personal safety.
Description
Technical field
Three-phase squirrel-cage induction motor technical field is the utility model is related to, more particularly to a kind of three-phase squirrel cage asynchronous electric
The safety device of machine.
Background technology
A kind of motor that three-phase squirrel-cage induction motor is daily life or industrial production is commonly used, can when using the motor
Unsafe problems can occur, the 380V alternating currents of start button connection and the coil for relay of having connected of motor, press and open
380V alternating currents have been connected after dynamic button, have made the relay coil of series connection conductive, so as to be that the relay contact of main circuit is connected,
Make electric motor starting.But start button is contact, and conducting voltage is very big, when the connection of 380V contacts turns on, necessarily produces
Raw electric arc, if nearby either circuit nearby makes moist or intake the button in control circuit, then when pressing start button, people's meeting
Get an electric shock, now voltage is 380V, and the injury to human body is very big, serious entail dangers to personal safety；Due in control circuit
Button, which touches, can produce unsafe factor, therefore how change the control circuit of motor into the problem of can not ignore.
The content of the invention
The shortcomings that in order to overcome above-mentioned prior art, it is asynchronous that the purpose of this utility model is the provision of a kind of three-phase squirrel cage
The protection device of motor, personal safety can be effectively protected.
In order to achieve the above object, the technical scheme that the utility model is taken is：
A kind of safety device of three-phase squirrel-cage induction motor, including control circuit and main circuit, U, V, W tri- of main circuit
Cross streams electric connection terminal connects S1 switches, the corresponding connection FU2 fuses of S1 switches, FU3 fuses, FU4 fuses, FU2 respectively
Fuse, FU3 fuses, FU4 fuses correspondingly connect KM2 relay normally open contacts, KM2 relay normally open contacts output end point
Not Lian Jie FR electrothermal relay detection means input, FR electrothermal relay detection means output end connection three phase squirrel cage it is asynchronous
Motor；
Control circuit includes 3V dc sources, and 3V dc sources, S switches, resistance R, photoelectricity LED1 and photoelectricity LED2 connect,
3V dc sources, KM1 relay coils, the series connection of phototriode V and GND earth terminal, photoelectricity LED2 and phototriode V compositions
Optical coupling device；The U of three-phase alternating current is connected FU fuses in main circuit, FU fuses connection FR electrothermal relays it is normally closed
Contact, the normally-closed contact connection KM1 relay normally open contacts of FR electrothermal relays, the connection FU1 fusing of KM1 relay normally open contacts
Device, FU1 fuses connect the V phases of three-phase alternating current.
The utility model has the advantages that：Thoroughly make the actuating section of control circuit by optical coupling device
With main circuit without electrical connection, make starting switch S safer, reached the purpose of vulnerabilities scan forceful electric power, simultaneously because
The presence of optical coupling device, make the anti-interference of circuit stronger.During motor start-up, stop when being effectively protected the person
Safety.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
The utility model is further illustrated with reference to Figure of description.
Reference picture 1, a kind of safety device of three-phase squirrel-cage induction motor, including control circuit and main circuit, main circuit
U, V, W three-phase alternating current electric connection terminal connect S1 switches respectively, the corresponding connection FU2 fuses of S1 switches, FU3 fuses, FU4 melt
Disconnected device, FU2 fuses, FU3 fuses, FU4 fuses correspondingly connect KM2 relay normally open contacts, KM2 relay normally open contacts
Output end connects the input of FR electrothermal relay detection means, the output end connection three-phase mouse of FR electrothermal relay detection means respectively
Cage asynchronous motor；
Control circuit includes 3V dc sources, and 3V dc sources, S switches, resistance R, photoelectricity LED1 and photoelectricity LED2 connect,
3V dc sources, KM1 relay coils, the series connection of phototriode V and GND earth terminal, photoelectricity LED2 and phototriode V compositions
Optical coupling device；The U of three-phase alternating current is connected FU fuses in main circuit, FU fuses connection FR electrothermal relays it is normally closed
Contact, the normally-closed contact connection KM1 relay normally open contacts of FR electrothermal relays, the connection FU1 fusing of KM1 relay normally open contacts
Device, FU1 fuses connect the V phases of three-phase alternating current.
Operation principle of the present utility model is：
In use, connecting S switches, indicator lamp photoelectricity LED1 is bright, and the photoelectricity LED2 in optical coupling device lights, photosensitive three
Pole pipe V is received turn on after illumination after cause KM1 relay coils to be powered, KM1 relay coils, which are powered, can cause KM1 relays
Normally opened contact closes, and KM1 relay normally open contacts closure causes KM2 relay coils to be powered, and KM2 relay coils are powered and can led
The KM2 relay normally open contacts closure of main circuit is caused, if on the premise of S1 switch closures, KM2 relay normally open contacts closure
Electric motor starting can be caused.FU fuses, FU1 fuses, FU2 fuses, FU3 fuses, FU4 fuses carry out short-circuit protection,
When occurring short-circuit in circuit, short circuit current makes fused mass of fuse fuse, so as to cut off circuit；When motor overload, FR heat after
The detection means of electrical equipment can open the normally-closed contact of FR electrothermal relays, and so as to cut off main circuit, motor is out of service.
Claims (1)
- A kind of 1. safety device of three-phase squirrel-cage induction motor, it is characterised in that：Including control circuit and main circuit, main circuit U, V, W three-phase alternating current electric connection terminal connect S1 switches respectively, the corresponding connection FU2 fuses of S1 switches, FU3 fuses, FU4 melt Disconnected device, FU2 fuses, FU3 fuses, FU4 fuses correspondingly connect KM2 relay normally open contacts, KM2 relay normally open contacts Output end connects the input of FR electrothermal relay detection means, the output end connection three-phase mouse of FR electrothermal relay detection means respectively Cage asynchronous motor；Control circuit includes 3V dc sources, and 3V dc sources, S switches, resistance R, photoelectricity LED1 and photoelectricity LED2 series connection, 3V are straight Flow power supply, KM1 relay coils, the series connection of phototriode V and GND earth terminal, photoelectricity LED2 and phototriode V composition photoelectricity Coupling device；The U of three-phase alternating current is connected FU fuses in main circuit, normally closed the touching of FU fuses connection FR electrothermal relays Point, the normally-closed contact connection KM1 relay normally open contacts of FR electrothermal relays, KM1 relay normally open contacts connection FU1 fuses, FU1 fuses connect the V phases of three-phase alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720578737.0U CN206806986U (en) | 2017-05-23 | 2017-05-23 | A kind of safety device of three-phase squirrel-cage induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720578737.0U CN206806986U (en) | 2017-05-23 | 2017-05-23 | A kind of safety device of three-phase squirrel-cage induction motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206806986U true CN206806986U (en) | 2017-12-26 |
Family
ID=60741788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720578737.0U Expired - Fee Related CN206806986U (en) | 2017-05-23 | 2017-05-23 | A kind of safety device of three-phase squirrel-cage induction motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206806986U (en) |
-
2017
- 2017-05-23 CN CN201720578737.0U patent/CN206806986U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20171226 Termination date: 20200523 |