CN2648672Y - Motor open-phase protector - Google Patents
Motor open-phase protector Download PDFInfo
- Publication number
- CN2648672Y CN2648672Y CN 03209520 CN03209520U CN2648672Y CN 2648672 Y CN2648672 Y CN 2648672Y CN 03209520 CN03209520 CN 03209520 CN 03209520 U CN03209520 U CN 03209520U CN 2648672 Y CN2648672 Y CN 2648672Y
- Authority
- CN
- China
- Prior art keywords
- motor
- phase
- bridge rectifier
- star
- open
- 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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- Control Of Ac Motors In General (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
A motor open-phase protector mainly aims at solving the problem that the current motor protector only can protect the motor when the motor is in overheat condition and can not practice open-phase protection to the motor. The utility model is characterized in that: three capacitors (1) that have the same capacity are mutually connected by star-typed mode; four same rectifier diodes (2) are mutually connected by bridge rectifier circuit mode; the neutral point of capacitors (1) after being connected by star-typed mode is connected to the power input end of the bridge rectifier circuit and the coil of a direct current relay (3) that has a normally closed contact (4) is connected between cathode and anode power output by the bridge rectifier circuit. The utility model is characterized by automatic protection when three-phase asynchronous motor is in open-phase.
Description
Technical field:
The utility model relates to a kind of motor protecting device, especially a kind of phase failure protector of electric motor that is applied to three-phase AC asynchronous motor.
Background technology:
At present the protection that three-phase AC asynchronous motor adopted mostly is overtemperature protection; promptly when the revolution electric current overrate certain multiple of motor; be connected on the thermal relay action in the control loop; cut off main circuit power; it is far from being enough to the safe operation of motor that but overtemperature protection is only arranged; because tend to take place the phase failure of three-phase alternating-current supply in the running of motor, this phase failure also can cause the damage of motor after continuing for some time.
The utility model content:
In order to overcome that existing motor protection mostly is overtemperature protection and the deficiency that can't realize open phase protection; the utility model provides a kind of phase failure protector of electric motor, and this kind phase failure protector of electric motor has can cut off the characteristics of main power circuit realization to the open phase protection of motor when the phase failure of three-phase AC asynchronous motor power supply.
Technical solutions of the utility model are: this kind phase failure protector of electric motor; comprise the some electric capacity that place in the housing; rectifier diode and direct current relay with normally-closed contact; wherein 3 electric capacity with same capability connect in star-like mode each other; 4 identical rectifier diodes interconnect with the bridge rectifier form; electric capacity is made the power input that neutral point after the star-like connection is connected to described bridge rectifier; zero-power line N is connected between the anode and cathode of two rectifier diodes that another is in series in the described bridge rectifier, and the coil of direct current relay is connected between the positive and negative power supply of described bridge rectifier output.
The beneficial effect that the utlity model has is: connect the neutral point that the back forms in star-like mode owing to take phase failure protector of electric motor in the such scheme to have one each other by 3 same capacitance; in case during the three phase mains generation phase failure; the three-phase imbalance electric current that forms on this neutral point will get the direct current relay coil by commutating circuit; then cut off the main power source current supply circuit, played open phase protection effect motor.Therefore the utlity model has and when the motor phase failure, to bring into play the characteristics of protection automatically.
Description of drawings:
Accompanying drawing 1 is a composition schematic diagram of the present utility model;
1-electric capacity among the figure, the 2-rectifier diode, the 3-direct current relay, the 4-normally-closed contact, the 5-housing, A-detects power input A, and B-detects power input B, and C-detects power input C, N-zero-power line.
Embodiment:
Below in conjunction with accompanying drawing will the utility model is described in further detail:
By shown in Figure 1; this kind phase failure protector of electric motor; comprise 1,3 rectifier diodes 2 of 3 electric capacity that place in the housing, direct current relay 3 with normally opened contact 4; wherein 3 electric capacity 1 with same capability connect in star-like mode each other; 4 identical rectifier diodes 2 interconnect with the bridge rectifier form; electric capacity 1 is made the power input that neutral point after the star-like connection is connected to described bridge rectifier, and the coil of direct current relay 3 is connected between the positive and negative power supply of described bridge rectifier output.
When reality is used, the A.C. contactor main contacts lower end that the detection power input A of phase failure protector of electric motor, B, C are connected to the three-phase AC asynchronous motor major loop respectively, the three-phase alternating voltage when moving to detect motor.The normally-closed contact 4 of direct current relay 3 is connected to the control loop of motor, is in series with the coil of wherein A.C. contactor.When the three-phase alternating-current supply phase failure, just can be on the neutral point that 3 electric capacity 1 that connect in star-like mode form owing to unsymmetrical current forms residual voltage, the bridge rectifier that is formed by 4 identical rectifier diodes 2 under this voltage effect will produce the direct voltage that acts on direct current relay 3 coils, makes its coil get by zero-power line N then.The direct current relay coil get electric after, its normally-closed contact 4 is opened, and cuts off the ac contactor coil current supply circuit of motor, thereby makes the A.C. contactor main contacts disconnect the motor stall.
In sum, phase failure protector of electric motor can be at three-phase in the such scheme owing to taking AC power lacks arbitrary phase time fast shut-off motor main power circuit, so the utility model Have the advantages that to finish automatic protection to motor at disconnected phase time.
Claims (1)
1, a kind of phase failure protector of electric motor; comprise some electric capacity (1), the rectifier diode (2) that places in the housing (5), direct current relay (3) with normally-closed contact (4); it is characterized in that: 3 electric capacity (1) with same capability connect in star-like mode each other; 4 identical rectifier diodes (2) interconnect with the bridge rectifier form; electric capacity (1) is made the power input that neutral point after the star-like connection is connected to described bridge rectifier, and the coil of direct current relay (3) is connected between the both positive and negative polarity of described bridge rectifier output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03209520 CN2648672Y (en) | 2003-09-15 | 2003-09-15 | Motor open-phase protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03209520 CN2648672Y (en) | 2003-09-15 | 2003-09-15 | Motor open-phase protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2648672Y true CN2648672Y (en) | 2004-10-13 |
Family
ID=34325182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03209520 Expired - Fee Related CN2648672Y (en) | 2003-09-15 | 2003-09-15 | Motor open-phase protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2648672Y (en) |
-
2003
- 2003-09-15 CN CN 03209520 patent/CN2648672Y/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 | ||
| 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 |