CN2172924Y - Protective switch for motors - Google Patents
Protective switch for motors Download PDFInfo
- Publication number
- CN2172924Y CN2172924Y CN 93247668 CN93247668U CN2172924Y CN 2172924 Y CN2172924 Y CN 2172924Y CN 93247668 CN93247668 CN 93247668 CN 93247668 U CN93247668 U CN 93247668U CN 2172924 Y CN2172924 Y CN 2172924Y
- Authority
- CN
- China
- Prior art keywords
- phase
- relay
- circuit
- motor
- protective
- 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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- Motor And Converter Starters (AREA)
Abstract
The utility model relates to a protective switch for motors, comprising a starting circuit and a protective circuit, wherein, the three phase balancing resistors of the protective circuit is in star-shaped connection. One end of each of the three phase balancing resistors is respectively connected with a three phase power supply; after serially connected with a resistor, a diode and a relay coil, the centre point of each of the three phase balancing resistors is connected with the ground; the normally closed contact of the relay is serially connected with the starting circuit of a motor. Due to adopting the structure, the utility model which is a novel, multifunctional and protective switch can realize the functions of open-phase protection and short-circuit protection due to overload.
Description
The utility model relates to a kind of protection switch, particularly a kind of motor protecting switch.
At present; the threephase motor of middle low power uses in a large number in every profession and trades such as factory, rural areas, because most of motor do not have reliably protecting, so China has large quantities of motors to damage every year; its reason mainly is to be two-phase because of motor after the phase shortage to rotate at a slow speed; electric current increases, make it to damage, especially pump motor, control motor automatically; in case phase shortage; motor will damage, though some motor is furnished with the overcurrent thermal relay, it often lacks phase failure protection function.
The purpose of this utility model is to provide a kind of motor protection switch that all can shield to power supply phase shortage, overcurrent, short circuit.
The purpose of this utility model is achieved in that a kind of motor protection switch; be to constitute by contactor, relay, resistance, diode, electrical condenser and protective tube; it is characterized in that: the arbitrary phase in the termination three phase mains of electric motor starting circuit; stop button; the normally-closed contact and the contactor coil of starting button, relay are linked in sequence; a normally opened contact of contactor is connected in parallel on start button two ends, the three-phase equilibrium resistance R of protective circuit
1, R
2, R
3Be star-like connected mode, the one end is connected on respectively on the three phase mains, its central point connecting resistance R
4, R
4The other end succeed the coil of electrical equipment J, the other end ground connection of relay J, capacitor C by diode d
1Be attempted by the two ends of J.
Its operation principle is such: when motor runs well; the neutral potential of three-phase electricity balance, three-phase equilibrium resistance is approximately zero, and protective circuit does not have electricity and is failure to actuate, when phase shortage; neutral potential raises; make the actuating of relay by diode rectification, its normally-closed contact is opened, and makes the contactor dead electricity; thereby trip protection motor; in case overload or short circuit take place, protective tube fusing, thus the J motor is protected in tripping operation after causing phase shortage.
Below in conjunction with drawings and Examples the utility model is further described:
Accompanying drawing is the utility model circuit theory diagrams and embodiment.
As shown in the figure: when motor runs well, three-phase electricity balance, three-phase equilibrium resistance R
1, R
2, R
3Neutral potential be approximately zero, protective circuit is not worked, when phase shortage took place, neutral potential raise, by making relay J action, its normally-closed contact J after the diode d rectification
1Open, make contactor C dead electricity, thus the trip protection motor D, in case overload or short circuit take place, protective tube B fusing, thus the J motor is protected in tripping operation after causing phase shortage.
Claims (1)
1, a kind of motor protection switch, be to constitute by contactor, relay, resistance, diode, capacitor and protective tube, it is characterized in that: arbitrary phase of a termination three phase mains of electric motor starting circuit, the normally-closed contact and the contactor coil of stop button, starting button, relay are linked in sequence, and a normally opened contact of contactor is connected in parallel on start button two ends; The three-phase equilibrium resistance R of protective circuit
1, R
2, R
3Be star-like connection, the one end is connected on respectively on the three phase mains, its central point connecting resistance R
4, R
4The other end succeed the coil of electrical equipment J, the other end ground connection of relay J, the two ends shunt capacitor C of relay J by diode d
1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93247668 CN2172924Y (en) | 1993-12-28 | 1993-12-28 | Protective switch for motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93247668 CN2172924Y (en) | 1993-12-28 | 1993-12-28 | Protective switch for motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2172924Y true CN2172924Y (en) | 1994-07-27 |
Family
ID=33820010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93247668 Expired - Fee Related CN2172924Y (en) | 1993-12-28 | 1993-12-28 | Protective switch for motors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2172924Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314195C (en) * | 2004-01-18 | 2007-05-02 | 桂林星辰电力电子有限公司 | AC motor three-phase current smoothing control device |
| CN105674575A (en) * | 2016-03-09 | 2016-06-15 | 浙江大学 | Gas water heater capable of detecting CO concentration |
| CN109859925A (en) * | 2018-12-19 | 2019-06-07 | 石家庄军特电子科技有限公司 | A kind of 3 road composite structure of ultra wideband transmissions line transformer |
| CN111934300A (en) * | 2020-06-29 | 2020-11-13 | 苏州艾克威尔科技有限公司 | Method for removing floating voltage of semiconductor controlled silicon |
-
1993
- 1993-12-28 CN CN 93247668 patent/CN2172924Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314195C (en) * | 2004-01-18 | 2007-05-02 | 桂林星辰电力电子有限公司 | AC motor three-phase current smoothing control device |
| CN105674575A (en) * | 2016-03-09 | 2016-06-15 | 浙江大学 | Gas water heater capable of detecting CO concentration |
| CN109859925A (en) * | 2018-12-19 | 2019-06-07 | 石家庄军特电子科技有限公司 | A kind of 3 road composite structure of ultra wideband transmissions line transformer |
| CN111934300A (en) * | 2020-06-29 | 2020-11-13 | 苏州艾克威尔科技有限公司 | Method for removing floating voltage of semiconductor controlled silicon |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |