CN2449402Y - Phase-lose automatic protector for three-phase ac asynchronous motor - Google Patents
Phase-lose automatic protector for three-phase ac asynchronous motor Download PDFInfo
- Publication number
- CN2449402Y CN2449402Y CN 00248183 CN00248183U CN2449402Y CN 2449402 Y CN2449402 Y CN 2449402Y CN 00248183 CN00248183 CN 00248183 CN 00248183 U CN00248183 U CN 00248183U CN 2449402 Y CN2449402 Y CN 2449402Y
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- China
- Prior art keywords
- phase
- asynchronous motor
- motor
- contactor
- automatic protector
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- Expired - Fee Related
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- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (AREA)
Abstract
The utility model relates to a phase-loss automatic protector for a three-phase ac asynchronous motor. The three-phase ac asynchronous motor and a contactor are connected together through a certain mode, and the insufficiency of the original technique is overcome. The motor can instantaneously cut off the control circuit after the phase of the motor is deficient, an alternate current contactor releases and cuts off a main loop, and accordingly, a power supply is cut off, and the rotation of the motor stops. The technique has the advantages of simple device and low cost. The effective rate achieves 100 percent, and the purpose of once investment and perennial protection is realized.
Description
Present technique belongs to the automatic resist technology of ac three-phase asynchronous motor field, especially ac three-phase asynchronous motor phase shortage automatic protector.
Technique known is at present: ac three-phase asynchronous motor is widely used in people's the production and life; yet motor is slipped up except operating personnel; outside motor is aging; phase shortage becomes the principal element of burning motor; at present; product to electric motor protecting in the market is a lot; as relay; comprehensive protector of motor etc.; common faults of these protection products are exactly can not the insantaneous break motor power after phase shortage; but by disconnecting after the time-delay; because motor is in the suddenly poly-increase of phase shortage after-current, the time one is long, and the A.C. contactor of control power supply can be stained with extremely because of overheated at the suddenly poly-increase of electric current back contactor main contacts; even control loop disconnects; be stained with dead and can not make the motor deenergization make burn-down of electric motor owing to main noddle on contactor, therefore, these protection products do not have the automatic protection of essence to the motor phase shortage.
The purpose of this utility model provides ac three-phase asynchronous motor phase shortage automatic protector; it has overcome the defective of original technology; it is to increase an auxiliary relay on the basis of former ac three-phase asynchronous motor; A.C. contactor is discharged; cut off major loop, can make motor insantaneous break control loop after phase shortage, thereby cut off motor power; the motor stall reaches the purpose of automatic protection.
The purpose of this utility model is to realize like this, it is linked together by certain way by ac three-phase asynchronous motor and contactor, contactor is connected by lead with power supply, motor, and be fixed on the binding post of main contact, a L1 of coil terminals is connected with lead with the contactor normally open contact and is fixed on the terminal; Often driving button is connected with lead with normally open contact and is fixed on the terminal; One end of auxiliary relay contact is connected with lead with the contactor normally open contact and is fixed on the terminal, and the other end is connected with the L2 of coil terminals and is fixing; Coil is received on the corresponding power phase, and adds a normally closed button in the middle of the L1 of coil terminals and the power line, does to stop to use.
Owing to realized such scheme, device is simple, and cost is low, efficiently reaches 100%, has realized once dropping into the purpose of long-term protection.
Below in conjunction with drawings and Examples the utility model is further specified:
Accompanying drawing is a schematic diagram:
1. motors, 2. contactors, 3. auxiliary relays, 4. main contacts among the figure
5. auxiliary contact 6. coils 7. buttons 8. normally open contacts 9. coil terminals
In the accompanying drawings: contactor 2 and power supply, motor 1 are connected by lead, and are fixed on the binding post of main contact 4; The L1 of coil terminals 9 is connected with contactor normally open contact 8 usefulness leads and is fixed on the terminal; Often driving button 7 is connected with normally open contact 8 usefulness leads and is fixed on the terminal; One end of auxiliary relay contact 5 is connected with contactor 2 normally open contacts 8 usefulness leads and is fixed on the terminal, and the other end is connected with the L2 of coil terminals 9 and is fixing; Coil 6 is received on the corresponding power phase, and adds a normally closed button in the middle of the L1 of coil terminals 9 and the power line.
Claims (4)
1, ac three-phase asynchronous motor phase shortage automatic protector, feature is altogether: be connected by lead with power supply with contactor 2 by ac three-phase asynchronous motor 1, and be fixed on the binding post of main contact 4.
2, ac three-phase asynchronous motor phase shortage automatic protector according to claim 1; it is characterized in that: the L1 of coil terminals 9 is connected with contactor normally open contact 8 usefulness leads and is fixed on the terminal, often drives button 7 and is connected with normally open contact 8 usefulness leads and is fixed on the terminal.
3, ac three-phase asynchronous motor phase shortage automatic protector according to claim 1; it is characterized in that: an end of auxiliary relay contact 5 is connected with contactor 2 normally open contacts 8 usefulness leads and is fixed on the terminal, and the other end is connected with the L2 of coil terminals 9 and is fixing.
4, ac three-phase asynchronous motor phase shortage automatic protector according to claim 1, it is characterized in that: coil 6 is received on the corresponding power phase, and adds a normally closed button in the middle of the L1 of coil terminals 9 and the power line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 00248183 CN2449402Y (en) | 2000-08-23 | 2000-08-23 | Phase-lose automatic protector for three-phase ac asynchronous motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 00248183 CN2449402Y (en) | 2000-08-23 | 2000-08-23 | Phase-lose automatic protector for three-phase ac asynchronous motor |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2449402Y true CN2449402Y (en) | 2001-09-19 |
Family
ID=33606896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 00248183 Expired - Fee Related CN2449402Y (en) | 2000-08-23 | 2000-08-23 | Phase-lose automatic protector for three-phase ac asynchronous motor |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2449402Y (en) |
-
2000
- 2000-08-23 CN CN 00248183 patent/CN2449402Y/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 |