CN204376391U - Three-phase alternating-current motor phase shortage automatic safety device - Google Patents
Three-phase alternating-current motor phase shortage automatic safety device Download PDFInfo
- Publication number
- CN204376391U CN204376391U CN201420800923.0U CN201420800923U CN204376391U CN 204376391 U CN204376391 U CN 204376391U CN 201420800923 U CN201420800923 U CN 201420800923U CN 204376391 U CN204376391 U CN 204376391U
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- CN
- China
- Prior art keywords
- phase
- contactor
- alternating current
- motor
- shortage
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- Expired - Fee Related
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- Motor And Converter Starters (AREA)
- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a kind of three-phase alternating-current motor phase shortage automatic safety device, it solve the automatic protection problem of phase shortage of three-phase alternating-current motor, parts are few, with low cost, strong interference immunity.It comprises the startup of motor, stopping control circuit and phase shortage automatic protection circuit, the startup of motor, stopping control circuit is same as the prior art, phase shortage automatic protection circuit is made up of two phase shortage open circuit A.C. contactors, wherein one end of a contactor coil winding is connected in three-phase alternating current in any phase of remaining in two-phase, the other end is connected on the zero line in three-phase and four-line alternating current, one end of another contactor coil winding to be connected in three-phase alternating current in a remaining phase, the other end is connected on the zero line in three-phase and four-line alternating current, after normally opened contact series connection on two contactors, be connected in series to motor start-up again, stop in control loop.The utility model can be applied in the control loop of various three-phase four-wire system alternating current motor.
Description
Technical field
The utility model relates to three-phase alternating-current motor control technology field, and specifically, it is a kind of three-phase alternating-current motor phase shortage automatic safety device.
Background technology
The application of three-phase alternating-current motor is very general, and in motor operation course, due to some reasons such as fuse blows, drop switch fall, causing the phase disappearance in three-phase alternating current, is can not problem unavoidably.Once three-phase electricity one phase disappearance, fail again to be found in time, motor runs under the state of phase shortage, will soon by motor winding.For the power-off immediately when phase shortage, thus protection motor winding is not burnt, and effective method increases phase shortage automatic safety device exactly in electromotor control circuit the most.Existing commercially available automatic phase interruption protection arrangement for motor kind is a lot, and protected effect is also more satisfactory, but most electronic circuit adopting complexity in these protective devices, not only cost is high, and at some special occasions, its anti-interference also shows slightly not enough.At present, also there are employing three contactors to form protective devices, although solve simplified structure, reduce costs problem, in the usage quantity of parts, still there is redundancy.
summary of the invention:
The purpose of this utility model is exactly solve the deficiency existed in existing three-phase alternating-current motor phase shortage automatic safety device, provides a kind of more simple, practical three-phase alternating-current motor phase shortage automatic safety device.
The purpose of this utility model realizes like this.Three-phase alternating-current motor phase shortage automatic safety device, it comprises, air switch (QS), first fuse (FU1) and the second fuse (FU2), main three-phase ac contactor (KM1), phase shortage open circuit A.C. contactor I (KM2), phase shortage open circuit A.C. contactor II (MK3), overload protection thermal relay (FR), start button (SB2), stop button (SB1) and three-phase alternating-current motor (M), motor (M) is through overload protection thermal relay (FR), main three-phase ac contactor (KM1) often opens main contacts, first fuse (FU1), air switch (QS) accesses three-phase alternating current A, B, in C current supply circuit, main three-phase ac contactor (KM1) often open after auxiliary contact and start button SB2 parallel connection with main three-phase ac contactor (KM1) coil windings, overload protection thermal relay FR normally-closed contact, stop button SB1 connects, one end second fuse (FU2) is connected in any phase in three-phase alternating current, the other end is connected on the zero line in three-phase and four-line alternating current, it is characterized in that: coil windings one end second fuse (FU2) of phase shortage open circuit A.C. contactor I (KM2) is connected in three-phase alternating current in any phase of remaining in two-phase, the other end is connected on the zero line in three-phase and four-line alternating current, coil windings one end second fuse (FU2) of phase shortage open circuit A.C. contactor II (KM3) to be connected in three-phase alternating current in a remaining phase, the other end is connected on the zero line in three-phase and four-line alternating current, after normally opened contact on two phase shortage open circuit A.C. contactors and phase shortage open circuit A.C. contactor I (KM2) are connected, be connected in series to motor start-up again, stop in control loop.
The utility model has the advantages that: with very simple control loop, solve the automatic protection problem of phase shortage of three-phase alternating-current motor, parts are few, with low cost, strong interference immunity, the basic electrotechnics knowledge of a GPRS just can by dress, use.The utility model can be applied in the control loop of various three-phase four-wire system alternating current motor.
Accompanying drawing explanation
The electrical schematic diagram that Fig. 1 is the utility model motor start-up, stopping controls and phase shortage is protected automatically.
Embodiment
embodiment 1:
All electric elements in the utility model all can be buied in market.Startup, the stopping control circuit of threephase motor M are prior art, do not repeat them here.In the utility model three ac contactor coil work windings be 220 volts, during installation as voltage, the circuit provided by accompanying drawing is arranged in control cabinet.Referring now to accompanying drawing, the operation principle of its phase shortage automatic protection circuit is described.Motor M startup is started working, when the A phase in three-phase electricity lacks, the coil windings dead electricity of phase shortage open circuit A.C. contactor KM3, phase shortage open circuit A.C. contactor II KM3 tripping, the normally opened contact be connected in main three-phase ac contactor KM1 control loop is opened, the coil windings dead electricity of main three-phase ac contactor KM1, main three-phase ac contactor KM1 tripping, motor M stops.When the B phase in three-phase electricity lacks, the coil windings dead electricity of phase shortage open circuit A.C. contactor KM2, contactor KM2 tripping, the normally opened contact KM3 be connected in main three-phase ac contactor KM1 control loop opens, the coil windings dead electricity of main three-phase ac contactor KM1, main three-phase ac contactor KM1 tripping, motor M stops.When the C phase in three-phase electricity lacks, the coil windings dead electricity thereupon of main three-phase ac contactor KM1, main three-phase ac contactor KM1 tripping, motor M stops.Fuse FU2 is arranged for protecting control circuit.Protective device can be contained in a box.
Claims (1)
1. three-phase alternating-current motor phase shortage automatic safety device, it comprises, air switch (QS), first fuse (FU1) and the second fuse (FU2), main three-phase ac contactor (KM1), phase shortage open circuit A.C. contactor I (KM2), phase shortage open circuit A.C. contactor II (MK3), overload protection thermal relay (FR), start button (SB2), stop button (SB1) and three-phase alternating-current motor (M), motor (M) is through overload protection thermal relay (FR), main three-phase ac contactor (KM1) often opens main contacts, first fuse (FU1), air switch (QS) accesses three-phase alternating current A, B, in C current supply circuit, main three-phase ac contactor (KM1) often open after auxiliary contact and start button SB2 parallel connection with main three-phase ac contactor (KM1) coil windings, overload protection thermal relay FR normally-closed contact, stop button SB1 connects, one end second fuse (FU2) is connected in any phase in three-phase alternating current, the other end is connected on the zero line in three-phase and four-line alternating current, it is characterized in that: coil windings one end second fuse (FU2) of phase shortage open circuit A.C. contactor I (KM2) is connected in three-phase alternating current in any phase of remaining in two-phase, the other end is connected on the zero line in three-phase and four-line alternating current, coil windings one end second fuse (FU2) of phase shortage open circuit A.C. contactor II (KM3) to be connected in three-phase alternating current in a remaining phase, the other end is connected on the zero line in three-phase and four-line alternating current, after normally opened contact on two phase shortage open circuit A.C. contactors and phase shortage open circuit A.C. contactor I (KM2) are connected, be connected in series to motor start-up again, stop in control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420800923.0U CN204376391U (en) | 2014-12-18 | 2014-12-18 | Three-phase alternating-current motor phase shortage automatic safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420800923.0U CN204376391U (en) | 2014-12-18 | 2014-12-18 | Three-phase alternating-current motor phase shortage automatic safety device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204376391U true CN204376391U (en) | 2015-06-03 |
Family
ID=53332572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420800923.0U Expired - Fee Related CN204376391U (en) | 2014-12-18 | 2014-12-18 | Three-phase alternating-current motor phase shortage automatic safety device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204376391U (en) |
-
2014
- 2014-12-18 CN CN201420800923.0U patent/CN204376391U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20161218 |