CN201323442Y - Multifunctional motor protective electricity economizer - Google Patents
Multifunctional motor protective electricity economizer Download PDFInfo
- Publication number
- CN201323442Y CN201323442Y CNU2008201245010U CN200820124501U CN201323442Y CN 201323442 Y CN201323442 Y CN 201323442Y CN U2008201245010 U CNU2008201245010 U CN U2008201245010U CN 200820124501 U CN200820124501 U CN 200820124501U CN 201323442 Y CN201323442 Y CN 201323442Y
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- Prior art keywords
- relay
- contactor
- motor
- electricity
- electronic switch
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- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a multifunctional motor protective electricity economizer. Three sampling voltage transformers are connected in an open-triangular shape; the output end of the open triangle is connected with a negative pressure rectifying filter circuit; a connecting end of the open triangle is connected with a positive pressure rectifying filter circuit; the negative pressure rectifying filter circuit and the positive pressure rectifying filter circuit are connected with a control electrode of an electronic switch; the output end of a step-down transformer is connected with a bridge-type rectifier; the bridge-type rectifier is connected with the two ends of a pull-in coil in an alternating current contactor through isolating diodes (D12) and (D13); one end of an auto-switching switch is connected with a relay, and the other end thereof is connected with the isolating diode (D12); and the relay is connected with the isolating diode (D12). By combing a motor phase failure overcurrent protector and an alternating current contactor electricity economizer together, on the one hand, the motor protective electricity economizer can save electricity of the alternating current contactor; and on the other hand, the motor protective electricity economizer can achieve the phase failure overcurrent protection of a motor.
Description
Technical field
The utility model relates to a kind of electricity-saving appliance, relates in particular to a kind of multi-functional electric motor protecting electricity-saving appliance that motor protector and A.C. contactor electricity-saving appliance are combined, and belongs to the energy-saving device technical field.
Background technology
A.C. contactor is a kind of safe in utilization, convenient, all comparatively ideal low-voltage electrical apparatus of various performances of control.The operation electromagnetic system of A.C. contactor generally adopts ac control power supply, and its distribution that consumes active power is roughly: iron core 65%～75%, short-circuited conducting sleeve 25%～30%, coil only account for 3%～5%.Therefore, its operation electromagnetic system is changed into the direct current sticking or do not had the exciting curent sticking by intrinsic alternating current operation, can save the loss power that accounts for the overwhelming majority in unshakable in one's determination and the short-circuited conducting sleeve, thereby obtain higher energy-saving efficiency.According to the interrelated data statistics, A.C. contactor adopts above-mentioned power-saving technique, and the power saving rate of active power can be up to more than 85%, and what have can surpass 95% unexpectedly.The A.C. contactor of the adopted power-saving technique that the whole nation is being moved is in 1,000,000.As after adopting power-saving technique, can save appreciable electric energy every year.In addition, A.C. contactor adopts power-saving technique also can reduce and eliminate noise, reduces the temperature rise of coil and prolongs its useful life, is subjected to users' welcome deeply.
On the other hand, motor is the major impetus source of industrial and agricultural production.For in, high capacity motor, adopted at present the electronic type motor protector of superior performance mostly.But; for using more popular miniature motor (as blower motor, little pump motor, machine motor and various farm machinery motors etc.); the accident generation of burn-down of electric motor often appears causing because protection is invalid in most of at present states that still are in no any protection facility or only use Control work under an air switch or the thermal relay protective condition.At present, though there is polytype motor protecting switch on the market, as electronic protector etc.But electronic protector one is that price is higher, the 2nd, and install and use electronic protector and still need certain electrician's technical ability, therefore restricted applying of electronic type motor protector.
In the patent No. is 95208558.5 Chinese utility model patent, provide a kind of electric motor protecting economize on electricity contactor.In this contactor, detect the phases failure and overload, short-circuit signal and detection of electrical leakage signal by three current transformers, respectively NAND gate in open-phase protection circuit and overload, short-circuit protection circuit transport to or door outlet circuit in BG
3Base stage, its grounded emitter, collector electrode connects motor rotation control revolution.The A.C. contactor moving contact links to each other with the mechanical latching battery saving arrangement by push rod.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of multi-functional electric motor protecting electricity-saving appliance.This electric motor protecting electricity-saving appliance combines motor phase failure overcurrent protector and A.C. contactor electricity-saving appliance dexterously, can realize the economize on electricity of A.C. contactor on the one hand, also can realize the phase failure overcurrent protection to motor on the other hand.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of multi-functional electric motor protecting electricity-saving appliance; comprise three sampling voltage instrument transformers, electronic switch, first relay; described three sampling voltage instrument transformers are enclosed within respectively on the three-phase power line of motor; become open-delta to connect; the output of this open-delta connects the negative pressure current rectifying and wave filtering circuit; the triangle link connects the malleation current rectifying and wave filtering circuit; described negative pressure current rectifying and wave filtering circuit is connected the control utmost point of described electronic switch with described malleation current rectifying and wave filtering circuit; described first relay is connected with described electronic switch, it is characterized in that:
Described multi-functional electric motor protecting electricity-saving appliance also comprises the A.C. contactor power save circuit;
Described A.C. contactor power save circuit comprises step-down transformer, bridge rectifier, isolation diode, automatic switching switch and second relay; Wherein
The output of described step-down transformer connects bridge rectifier, and described bridge rectifier is through isolating diode D
12, D
13The two ends that connect the A.C. contactor pull-in winding respectively;
One end of described automatic switching switch is connected with described second relay, and the other end connects isolates diode D
12
Described second relay and isolation diode D
12Connect.
This multi-functional electric motor protecting electricity-saving appliance has the advantage of following several respects:
(1) economize on electricity more than 80～90%: with CJ20, CJ10, CJX63-400A A.C. contactor is example, and its pull-in winding power is 38～120VA, use this electricity-saving appliance after electrical power reduce to 3～8VA;
(2) environmental protection is lengthened the life: common A.C. contactor uses and does not exchange noise eliminating, adhesive behind this electric motor protecting node device steadily effectively, do not shake, and has reduced the damage of shake spark to contacts of contactor, and the contactor life-span is prolonged;
(3)-and the many usefulness of machine, not only protect motor but also make the economize on electricity of A.C. contactor pull-in winding, improve A.C. contactor pull-in winding power factor, bring up to more than 0.9 from 0.2;
(4) highly sensitive to electric motor protecting, good stability, antijamming capability is strong, can both disconnect motor power in the motor phase failure 3 seconds, overcurrent accurately and reliably in 15 seconds, and the protection motor is not burnt out.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is the circuit theory diagrams of this multi-functional electric motor protecting electricity-saving appliance.
Embodiment
This multi-functional electric motor protecting electricity-saving appliance is made up of two parts circuit, and wherein a part is the A.C. contactor power save circuit, and another part is a motor protective circuit.Below, the composition and the operation principle of this two parts circuit is described in detail.
As shown in Figure 1, the A.C. contactor power save circuit adopts the pattern of AC-DC, dual power supply, and promptly high pressure (direct current 380V) starts, and low pressure (direct current 12V) is kept automatic switching.Wherein A, B point is the alternating voltage importation, and C, D point is mixed-voltage direct current 380V, direct current 12V output, also is the input of A.C. contactor pull-in winding CJ simultaneously.After A, B point was connected interchange 380V control voltage, the output of step-down transformer is output AC 12V voltage just.This voltage is through D
4～D
7Behind the bridge rectifier, through isolating diode D
12, D
13Connect C, the D point of pull-in winding CJ respectively, keep pick-up voltage for A.C. contactor provides.Automatic switching switch T
2Anode and relay J
1Series connection, negative electrode connect isolates diode D
12Relay J
1With isolation diode D
12Connect.Be attempted by the automatic switching switch T of low-voltage direct end
2Electric after, drive relay J
1The long contacting of opening, the 380V starting voltage is connected.This voltage is through protective resistance R
VAnd D
8～D
11C, the D point of incoming transport contactor pull-in winding CJ also is direct current 12V behind the bridge rectifier.The 380V starting voltage is kept the mixing point of pick-up voltage, and A.C. contactor pull-in winding CJ gets electric back adhesive.After A.C. contactor adhesive self-locking, automatic switching switch T
2Close J
1Disconnect, the 380V starting voltage also disconnects.The A.C. contactor adhesive, 12V keeps by low-voltage direct.Above-mentioned automatic switching switch T
2Being preferably controllable silicon (SCR), also can be power electronic device such as GTO, IGBT.
Introduce this multi-functional electric motor protecting electricity-saving appliance above and realized the operation principle that A.C. contactor economizes on electricity, further introduced the operation principle of the motor phase failure current foldback circuit in this electric motor protecting electricity-saving appliance below.
As shown in Figure 1, D is protected motor, and A, B, C are respectively the three-phase power line of motor.Three sampling voltage instrument transformers in the motor protective circuit are gathered voltage signal from the major loop of three phase mains.This sampling voltage instrument transformer adopts the open-delta connected mode, and its output connects by D
1, C
1, R
1Deng the negative pressure current rectifying and wave filtering circuit of forming, the triangle link connects D
2, D
3, C
2, R
2, R
3Deng the malleation current rectifying and wave filtering circuit of forming.Sampled signal behind the negative pressure current rectifying and wave filtering circuit is through C
1Be filtered into control signal, the sampled signal behind the malleation current rectifying and wave filtering circuit is through C
2It after the filtering triggering signal.Control signal is sent into electronic switch T
1Control extremely in.This electronic switch is preferably controllable silicon (SCR), also can be power electronic device such as GTO, IGBT.Electronic switch T
1The control utmost point connect voltage stabilizing didoe, anode connects relay J
2
Like this, when motor ran well, the negative level of control signal was greater than the positive level of triggering signal, electronic switch T
1Also obstructed because of Triggerless, motor runs well; When the motor phase shortage, the open-delta output is zero, and the output of negative pressure current rectifying and wave filtering circuit also is zero, therefore can't produce control signal corresponding.And the output signal of malleation current rectifying and wave filtering circuit triggers electronic switch T
1, make its conducting, relay J
2Get electric adhesive, with the dump of A.C. contactor; When motor overload moved, signal voltage increased, and signal voltage punctures voltage stabilizing didoe, electronic switch T when being elevated to 1.3～1.6 times of rated voltage
1Circuit turn-on, relay J
2Get electric adhesive, with the power supply disconnection of A.C. contactor, the protection motor is not burnt out.
More than multi-functional electric motor protecting electricity-saving appliance described in the utility model is had been described in detail.For one of ordinary skill in the art, any conspicuous change of under the prerequisite that does not deviate from the utility model connotation it being done all will constitute to the utility model infringement of patent right, with corresponding legal responsibilities.
Claims (2)
1. multi-functional electric motor protecting electricity-saving appliance; comprise three sampling voltage instrument transformers, electronic switch, first relay; described three sampling voltage instrument transformers are enclosed within respectively on the three-phase power line of motor; become open-delta to connect; the output of this open-delta connects the negative pressure current rectifying and wave filtering circuit; the triangle link connects the malleation current rectifying and wave filtering circuit; described negative pressure current rectifying and wave filtering circuit is connected the control utmost point of described electronic switch with described malleation current rectifying and wave filtering circuit; described first relay is connected with described electronic switch, it is characterized in that:
Described multi-functional electric motor protecting electricity-saving appliance also comprises the A.C. contactor power save circuit;
Described A.C. contactor power save circuit comprises step-down transformer, bridge rectifier, isolation diode, automatic switching switch and second relay; Wherein
The output of described step-down transformer connects bridge rectifier, and described bridge rectifier is through isolating diode (D
12), (D
13) connect the two ends of A.C. contactor pull-in winding respectively;
One end of described automatic switching switch is connected with described second relay, and the other end connects isolates diode (D
12);
Described second relay and isolation diode (D
12) connect.
2. multi-functional electric motor protecting electricity-saving appliance as claimed in claim 1 is characterized in that:
Described electronic switch and described automatic switching switch are any one among controllable silicon, GT0, the IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201245010U CN201323442Y (en) | 2008-12-19 | 2008-12-19 | Multifunctional motor protective electricity economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201245010U CN201323442Y (en) | 2008-12-19 | 2008-12-19 | Multifunctional motor protective electricity economizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201323442Y true CN201323442Y (en) | 2009-10-07 |
Family
ID=41160814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201245010U Expired - Fee Related CN201323442Y (en) | 2008-12-19 | 2008-12-19 | Multifunctional motor protective electricity economizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201323442Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842888A (en) * | 2011-06-24 | 2012-12-26 | 深圳市万禧节能科技有限公司 | Energy saving and load protecting device and method for alternating current contactor |
| CN102842894A (en) * | 2012-10-10 | 2012-12-26 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
-
2008
- 2008-12-19 CN CNU2008201245010U patent/CN201323442Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842888A (en) * | 2011-06-24 | 2012-12-26 | 深圳市万禧节能科技有限公司 | Energy saving and load protecting device and method for alternating current contactor |
| CN102842894A (en) * | 2012-10-10 | 2012-12-26 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
| CN102842894B (en) * | 2012-10-10 | 2015-04-22 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
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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: 20091007 Termination date: 20121219 |