CN202405758U - Open-phase protection device of electric motor - Google Patents
Open-phase protection device of electric motor Download PDFInfo
- Publication number
- CN202405758U CN202405758U CN2011205124712U CN201120512471U CN202405758U CN 202405758 U CN202405758 U CN 202405758U CN 2011205124712 U CN2011205124712 U CN 2011205124712U CN 201120512471 U CN201120512471 U CN 201120512471U CN 202405758 U CN202405758 U CN 202405758U
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- phase
- contactor
- relay
- normally
- open
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Abstract
The utility model relates to an open-phase protection device of an electric motor, which comprises a contactor, a relay, three open-phase capacitors and an electric bell, wherein three normally open contacts of the contactor is connected in a three-phase power supply; a normally-closed contact of the relay is connected with a contactor coil in series to be connected with any two-phase power supply; one ends of the three open-phase capacitors are all connected between the three normally open contacts of the contactor and the electric motor and the other ends of the three open-phase capacitors are all connected with a circuit end of a relay coil; the electric bell is connected in series with a normally closed contact of the contactor to be connected with any two-phase power supply; and artificial midpoint voltage of the three open-phase capacitors is not zero when open phase exists and the voltage is unbalanced, then the relay coil is charged with electricity, the normally-closed contact of the relay is sucked open, the contactor is disconnected, and the electric motor stops operating due to the lack of power. At the same time, the normally-closed contact of the contactor returns to the closed state and enables the electric bell to sound an alarm. The open-phase protection device of the electric motor is simple in structure, sensitive in response and economic in cost.
Description
Technical field
The utility model relates to motor protecting device, refers to a kind of motor phase failure protection device particularly.
Background technology
Through discovering, the reason of motor damage remove cross flow through (owing) press and environmental factor, also have one very important reasons be exactly because " phase shortage " of three phase mains, this is the maximum stealthy killer that motor is damaged.Motor is in operation and causes " phase shortage " of three phase mains for a certain reason, and motor continues operation, is difficult for finding; This moment, motor current sharply increased; Because overcurrent protector has certain hysteresis quality or thermal inertia, the short time built-in motor can not break away from power supply and winding temperature is sharply raise, insulation breakdown; If things go on like this, with causing burning of motor.
At present in order effectively to avoid motor normally to move when three phase mains " phase shortage "; Usually can be equipped with the complete motor protecting device of function to motor; Although phase-deficient operation is had certain effect; But cost higher (every reaches more than the hundreds of unit), and be limited (can only protect) to the motor front end to open-phase protection.
Summary of the invention
The purpose of the utility model just is to provide a kind of motor phase failure protection device, when this device can " phase shortage " occur at the three phase mains of motor, can cut off the power supply of motor rapidly, guarantees the security of operation of motor.
Realize that the technical scheme that the utility model purpose adopts is: a kind of motor phase failure protection device comprises:
Contactor, its three normally open contacts are connected on the three phase mains that is input to motor;
Relay, its normally-closed contact, being together in series with the coil of said contactor is connected any two of above-mentioned three phase mains and goes up mutually;
Three phase shortage electric capacity, one of which end are connected in the three phase mains between three normally open contacts of said contactor and the motor, and its other end all is connected the circuit end of said relay coil.
Further, also comprise electric bell, it is together in series with the normally closed interlock of contactor and is connected any two of above-mentioned three phase mains and goes up mutually.
Further, start button and stop button; Said start button, contactor coil, relay normally-closed contact and stop button are together in series and are connected in any two-phase power supply.
Further, electric bell, it is connected with the normally closed interlock of contactor, and the end after the series connection is connected on the same power supply mutually with start button, and the other end is connected between relay normally-closed contact and the stop button.
In the technique scheme, said three phase shortage electric capacity are no more than 10 μ F, and its withstand voltage is 600v.
Further, be connected with piezo-resistance between the circuit end of said three phase shortage electric capacity and relay coil, the withstand voltage scope of this piezo-resistance is 47～68v.
In technique scheme, said relay is AC relay or the direct current relay of 24～110v.
Three phase shortage electric capacity in the utility model provide artificial mid-point voltage U, U=0 when the three-phase voltage symmetry, and relay coil two ends no-voltage is not worked.When phase shortage takes place or during Voltage unbalance, U is not equal to 0, and this moment, relay coil got electricly, and the relay normally-closed contact that will connect with contactor coil is inhaled and opened, and makes the contactor disconnection, thereby makes the motor dead electricity and shut down.The contactor normally closed interlock of meanwhile, connecting with electric bell recovers closed and electric bell is reported to the police.
The utlity model has following effect:
1, simple in structure, be swift in motion, can be in case phase shortage takes place at snap action, and accurately and reliably.
2, how highly versatile all can directly use no matter the motor power (output) size connects method.
3, the reactance voltage disequilibrium is good, even three phase mains is unbalance 30%, this device still misoperation can not take place.In addition, can adjust out-of-balance voltage through the different resistances of choosing piezo-resistance according to the power supply situation.
4, install additional easily, with low cost, a whole set of cost is dozens of yuan only.
5, the utility model is not under normal circumstances worked, and can not increase extra power consumption.
Description of drawings
Fig. 1 is the circuit structure block diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.
As shown in Figure 1; The motor phase failure protection device comprises that contactor is (not shown; Only describe with its three normally open contacts 107, coil 102 and normally closed interlock 105 places in circuit), three phase shortage electric capacity 107 and relay 110 (not shown, as only to describe with normally-closed contact 103 places in circuit) with its actuating coil 110.Wherein the used relay of present embodiment is small-sized AC relay or the direct current relay of 24～110v, and three phase shortage electric capacity are no more than 10 μ F, and its withstand voltage is 600v.
It is last that three normally open contacts 107 of contactor are connected to the three phase mains A, B, the C that are input to motor 111, is used to control the break-make of three phase mains.Three phase shortage electric capacity 108 are connected on the three-phase wire between three normally open contacts 107 of contactor and the motor 111, and the other end of three phase shortage electric capacity 108 all is connected the non-earth terminal of relay coil 110.The normally-closed contact 103 of relay and the coil 102 of contactor are together in series any two between the normally open contact 107 that is connected A, B, C three phase mains and contactor mutually in the electric wire, be connected in the present embodiment B, C mutually between.
Operate this device for ease; Also be provided with start button 101 and stop button 106 in the foregoing circuit; Start button 101, contactor coil 102, relay normally-closed contact 103 and stop button 106 are together in series and are connected in any two-phase power supply; In the present embodiment, the power input of start button 101 is connected on the C phase power supply, and the power end of stop button 106 is connected on the B phase power supply.
In order to give the alarm after the phase shortage taking place, present embodiment also comprises electric bell 104, and electric bell 104 and the normally closed interlock 105 of relay 110 are connected on any two between the normally open contact 107 of A, B, C three phase mains and contactor mutually in the electric wire.In order to simplify circuit, the electric bell 104 after the series connection and the end that contactor normally closed interlock 105 is together in series are connected C mutually on the power supply, and the other end is connected between relay normally closed interlock 103 and the stop button 106.
The course of work of the utility model is following:
Under A, B, the C three phase mains normal condition: press start button 101, contactor coil 102 and 103 energisings of relay normally-closed contact, contactor work, normally open contact 107 closures of contactor, A, B, C three phase mains are given motor 111 normal power supplies.Contactor normally closed interlock 105 disconnections this moment, electric bell is not worked.
A, B, C three phase mains generation phase shortage; Then three phase mains is seriously uneven, and promptly the mid-point voltage of phase shortage electric capacity 108 reaches 110 volts, and this moment, relay moved rapidly; Its normally-closed contact 103 is inhaled to be opened; Then contactor coil 102 outages make the contactor normally open contact 107 that is arranged in A, B, C three phase mains recover to break off, and this moment, motor 111 was out of service.Meanwhile, contactor normally closed interlock 105 recovers closed, then forms power circuit between electric bell 104, contactor normally closed interlock 105 and the stop button, so warning is sent in electric bell 104 energisings.
Because of voltage ripple of power network misoperation taking place for fear of extraneous factor, is connected with piezo-resistance 109 between the relay 110 of present embodiment and three phase shortage electric capacity 108.The choosing of piezo-resistance 109 depended on the permissible value that voltage ripple of power network caused three-phase imbalance and caused the Voltage unbalance that is input to motor to cause the motor cisco unity malfunction or permissible value when diminishing motor because of certain reason.The preferred withstand voltage value range of piezo-resistance 109 is 47～68v in the present embodiment.Piezo-resistance 109 can also be the relay dividing potential drop, prevents that relay from burning out because of overvoltage.
The utility model is quick on the draw, in case phase shortage takes place, can move rapidly, makes motor 111 break away from power supply, avoids being damaged.
Claims (8)
1. a motor phase failure protection device is characterized in that, comprises
Contactor, its three normally open contacts are connected on the three phase mains that is input to motor;
Relay, its normally-closed contact, being together in series with the coil of said contactor is connected any two of above-mentioned three phase mains and goes up mutually;
Three phase shortage electric capacity, one of which end are connected in the three phase mains between three normally open contacts of said contactor and the motor, and its other end all is connected the circuit end of said relay coil.
2. motor phase failure protection device according to claim 1 is characterized in that, also comprises:
Electric bell, it is together in series with the normally closed interlock of contactor and is connected any two of above-mentioned three phase mains and goes up mutually.
3. motor phase failure protection device according to claim 1 is characterized in that, also comprises:
Start button and stop button;
Said start button, contactor coil, relay normally-closed contact and stop button are together in series and are connected in any two-phase power supply.
4. motor phase failure protection device according to claim 3 is characterized in that, also comprises:
Electric bell, it is connected with the normally closed interlock of contactor, and the end after the series connection is connected on the same power supply mutually with start button, and the other end is connected between relay normally-closed contact and the stop button.
5. motor phase failure protection device according to claim 1 is characterized in that: said three phase shortage electric capacity are for being no more than 10 μ F, and its withstand voltage is the interchange oiled paper capacitor of 600v.
6. according to each described motor phase failure protection device of claim 1～5, it is characterized in that: be connected with piezo-resistance between the circuit end of said three phase shortage electric capacity and relay coil.
7. motor phase failure protection device according to claim 6 is characterized in that: the withstand voltage scope of said piezo-resistance is 47～68v.
8. motor phase failure protection device according to claim 1 is characterized in that: said relay is AC relay or the direct current relay of 24～110v.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205124712U CN202405758U (en) | 2011-12-09 | 2011-12-09 | Open-phase protection device of electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205124712U CN202405758U (en) | 2011-12-09 | 2011-12-09 | Open-phase protection device of electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202405758U true CN202405758U (en) | 2012-08-29 |
Family
ID=46703375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205124712U Expired - Fee Related CN202405758U (en) | 2011-12-09 | 2011-12-09 | Open-phase protection device of electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202405758U (en) |
-
2011
- 2011-12-09 CN CN2011205124712U patent/CN202405758U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Xingyi Century Technology Co., Ltd. Assignor: Hubei Shuanghuan Science and Technology Stock Co., Ltd. Contract record no.: 2013420000130 Denomination of utility model: Open-phase protection apparatus for three-phase motor Granted publication date: 20120829 License type: Exclusive License Record date: 20130814 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20151209 |
|
| EXPY | Termination of patent right or utility model |