CN202817717U - Simple motor open-phase protector - Google Patents
Simple motor open-phase protector Download PDFInfo
- Publication number
- CN202817717U CN202817717U CN 201220313963 CN201220313963U CN202817717U CN 202817717 U CN202817717 U CN 202817717U CN 201220313963 CN201220313963 CN 201220313963 CN 201220313963 U CN201220313963 U CN 201220313963U CN 202817717 U CN202817717 U CN 202817717U
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- relay
- phase
- switch
- electric capacity
- capacitor
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Abstract
The utility model discloses a simple motor open-phase protector including a motor, a breaker, a three-phase switch, a first relay, a first button switch, a second button switch, a rectification circuit, a second relay, a diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a bulb. The second relay is provided with a group of normally closed contacts serially connected in an original contactor coil loop, after the second relay is picked up, the normally closed switch of the second relay is turned off, the first relay losses power, the motor stops working, thereby taking the effect of protection. The simple motor open-phase protector also has the protection function that the breaker breaks down when the line has a short circuit fault, and when the line is overloaded, an electrothermal relay starts to work because of larger current to enable the relays to loss power. The simple motor open-phase protector is suitable for small and medium motors, and is reliable in work, simple in strucutre, small in size, low in cost, as well as is in favor of popularization.
Description
Technical field
The utility model relates to a kind of additional protection means of motor, relates in particular to a kind of easy open phase protector of motor.
Background technology
Special-purpose phase-lacking protective device is multiplex in the startup operation circuit of large-size machine, and for most middle and small motor, only is equipped with short circuit and overload protection.When circuit had short trouble, circuit breaker can be jumped disconnected, and during overload, larger electric current can make the thermal relay action, thereby makes the relay coil dead electricity, plays a protective role.And work as motor in running, when causing for a certain reason the phase shortage phenomenon to occur, motor will soon be burnt.If middle and small motor adopts above-mentioned professional phase-lacking protective device rather to waste one's talent on a petty job, and existing phase-lacking protective device complex structure, cost are high, volume is large, are not suitable for middle and small motor.
Summary of the invention
The purpose of this utility model provides a kind of easy open phase protector of motor with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises motor, circuit breaker, threephase switch, the first relay, the first push-button switch and the second push-button switch, also comprise rectification circuit, the second relay, diode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and bulb, three phase mains passes through threephase switch successively, the normal open switch of described the first relay be connected circuit breaker and be connected with motor, the first end of described the first push-button switch simultaneously with the third phase of described threephase switch be connected the third phase of the first normal open switch of the first relay and be connected, the second end of described the first push-button switch simultaneously with the first end of described the second push-button switch be connected the first end of the second normal open switch of the first relay and be connected, the second end of described the second push-button switch simultaneously with the normally closed switch of described the second relay be connected second end of the second normal open switch of the first relay and be connected, the second end of the normally closed switch of described the second relay is connected with the first end of described the first relay, the second end of described the first relay simultaneously with zero line be connected the end of input of rectification circuit and be connected, the other end while of the input of described rectification circuit and the first end of described the first electric capacity, the first end of described the second electric capacity be connected the first end of the 3rd electric capacity and connect, the second end of described the first electric capacity simultaneously with the third phase of the first normal open switch of described the first relay be connected the third phase of circuit breaker and be connected, the second end of described the second electric capacity simultaneously with the second-phase of the first normal open switch of described the first relay be connected the second-phase of circuit breaker and be connected, the second end of described the 3rd electric capacity simultaneously with the first-phase of the first normal open switch of described the first relay be connected the first-phase of circuit breaker and be connected, the cathode output end while of described rectification circuit and the first end of described the 4th electric capacity, the first end of described the second relay, the negative pole of described diode be connected the first end of bulb and connect, the cathode output end of described rectification circuit is simultaneously and the second end of described the 4th electric capacity, the second end of described the second relay, the positive pole of described diode be connected the second end of bulb and connect.
The beneficial effects of the utility model are:
The utility model is a kind of better simply Intelligent weak current switch, has equally when circuit is short-circuited fault, and circuit breaker can be jumped disconnected; during overload; larger electric current can make the thermal relay action, thereby makes the relay coil dead electricity, plays the function of protection.And be applicable to middle and small motor, reliable operation, simple in structure, volume is little, cost is low, be conducive to promote.
Description of drawings
Accompanying drawing 1 is circuit structure schematic diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in drawings: comprise motor M, circuit breaker RP, threephase switch Q, the first relay K M1, the first push-button switch SB1, the second push-button switch SB2, rectification circuit DR, the second relay K M2, diode VD, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and bulb HL, three phase mains is successively by threephase switch Q, the first normal open switch KM1-1 of the first relay K M1 is connected with motor M with circuit breaker RP, the first end of the first push-button switch SB1 simultaneously with the third phase C of threephase switch Q be connected the third phase C of the first normal open switch KM1-1 of relay K M1 and be connected, the second end of the first push-button switch SB1 simultaneously with the first end of the second push-button switch SB2 be connected the first end of the second normal open switch KM1-2 of relay K M1 and be connected, the second end of the second push-button switch SB2 simultaneously with the normally closed switch KM2-1 of the second relay K M2 be connected the second end of the second normal open switch KM1-2 of relay K M1 and be connected, the second end of the normally closed switch KM2-1 of the second relay K M2 is connected with the first end of the first relay K M1, the second end of the first relay K M1 simultaneously and zero line N be connected an end of input with rectification circuit DR and be connected, the other end while of the input of rectification circuit DR and the first end of the first capacitor C 1, the first end of the first end of the second capacitor C 2 and the 3rd capacitor C 3 connects, the second end of the first capacitor C 1 simultaneously and the third phase C of the first normal open switch KM1-1 of the first relay K M1 be connected third phase C with circuit breaker RP and be connected, the second end of the second capacitor C 2 simultaneously and the second-phase B of the first normal open switch KM1-1 of the first relay K M1 be connected second-phase B with circuit breaker RP and be connected, the second end of the 3rd capacitor C 3 simultaneously and the first-phase A of the first normal open switch KM1-1 of the first relay K M1 be connected first-phase A with circuit breaker RP and be connected, the cathode output end while of rectification circuit DR and the first end of the 4th capacitor C 4, the first end of the second relay K M2, the negative pole of diode VD is connected first end and is connected with bulb HL, the cathode output end of rectification circuit DR simultaneously and the second end of the 4th capacitor C 4, the second end of the second relay K M2, the positive pole of diode VD is connected the second end and is connected with bulb HL.
As shown in drawings: open-phase protection circuit is shown in the dotted line frame among the figure.
As shown in drawings: whenever from three-phase line draw single line by electric capacity, be attempted by a bit.Form artificial neutral point.When circuit was normal, neutral point voltage was zero, if a certain mutually open circuit, then neutral point voltage raises, and the rectification circuit DR that itself and zero line N consist of has Voltage-output, makes the second relay K M2 adhesive after 4 filtering of the 4th electric capacity capacitor C.The second relay K M2 has one group of normally-closed contact to be serially connected in the original contactor coil loop, and after the second relay K M2 adhesive, the normally closed switch KM2-1 of its second relay K M2 disconnects, the first relay K M1 dead electricity, and motor quits work, and has played protective effect.Meanwhile, bulb HL is luminous, and the prompting maintenance personal is the open-phase protection action, accelerates the speed that the maintenance personal checks and fixes a breakdown.
Claims (1)
1. easy open phase protector of motor; comprise motor; circuit breaker; threephase switch; the first relay; the first push-button switch and the second push-button switch; it is characterized in that: also comprise rectification circuit; the second relay; diode; the first electric capacity; the second electric capacity; the 3rd electric capacity; the 4th electric capacity and bulb; three phase mains passes through threephase switch successively; the first normal open switch of described the first relay be connected circuit breaker and be connected with motor; the first end of described the first push-button switch simultaneously with the third phase of described threephase switch be connected the third phase of the first normal open switch of the first relay and be connected; the second end of described the first push-button switch simultaneously with the first end of described the second push-button switch be connected the first end of the second normal open switch of the first relay and be connected; the second end of described the second push-button switch simultaneously with the normally closed switch of described the second relay be connected second end of the second normal open switch of the first relay and be connected; the second end of the normally closed switch of described the second relay is connected with the first end of described the first relay; the second end of described the first relay simultaneously with zero line be connected the end of input of rectification circuit and be connected; the other end while of the input of described rectification circuit and the first end of described the first electric capacity; the first end of described the second electric capacity be connected the first end of the 3rd electric capacity and connect; the second end of described the first electric capacity simultaneously with the third phase of the first normal open switch of described the first relay be connected the third phase of circuit breaker and be connected; the second end of described the second electric capacity simultaneously with the second-phase of the first normal open switch of described the first relay be connected the second-phase of circuit breaker and be connected; the second end of described the 3rd electric capacity simultaneously with the first-phase of the first normal open switch of described the first relay be connected the first-phase of circuit breaker and be connected; the cathode output end while of described rectification circuit and the first end of described the 4th electric capacity; the first end of described the second relay; the negative pole of described diode be connected the first end of bulb and connect, the cathode output end of described rectification circuit is simultaneously and the second end of described the 4th electric capacity; the second end of described the second relay; the positive pole of described diode be connected the second end of bulb and connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313963 CN202817717U (en) | 2012-07-02 | 2012-07-02 | Simple motor open-phase protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313963 CN202817717U (en) | 2012-07-02 | 2012-07-02 | Simple motor open-phase protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202817717U true CN202817717U (en) | 2013-03-20 |
Family
ID=47876531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220313963 Expired - Fee Related CN202817717U (en) | 2012-07-02 | 2012-07-02 | Simple motor open-phase protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202817717U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896472A (en) * | 2015-01-26 | 2016-08-24 | 黄焕珠 | Phase loss protector of three-phase AC motor |
-
2012
- 2012-07-02 CN CN 201220313963 patent/CN202817717U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896472A (en) * | 2015-01-26 | 2016-08-24 | 黄焕珠 | Phase loss protector of three-phase AC motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20130702 |