CN202435010U - Open phase protector of motor unit - Google Patents
Open phase protector of motor unit Download PDFInfo
- Publication number
- CN202435010U CN202435010U CN 201120511787 CN201120511787U CN202435010U CN 202435010 U CN202435010 U CN 202435010U CN 201120511787 CN201120511787 CN 201120511787 CN 201120511787 U CN201120511787 U CN 201120511787U CN 202435010 U CN202435010 U CN 202435010U
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- China
- Prior art keywords
- motor
- controllable silicon
- open phase
- transducer
- motor unit
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Abstract
The utility model provides an open phase protector of a motor unit, belonging to the technical field of motor security protection. The open phase protector comprises a reference sensor, a sensor, a voltage comparing circuit, a relay, a reset switch, a power supply circuit and a control circuit. The open phase protector can be used for open phase protection of a plurality of motors synchronously; if one open phase fault happens to one of the motors, automatic tripping is carried out to a partial or even all the motors according to the production situation so as to protect the security of the whole production; compared with the existing protecting device, the protector is simple in installation, regulation and maintenance; and the protector has the advantages of being simple in circuit, lower in realizing cost and convenient to use.
Description
Technical field
The utility model relates to a kind of motor phase-lacking protective device, especially relates to a kind of threephase motor group open phase protector, belongs to motor security protection technology field.
Background technology
During the threephase asynchronous phase-deficient operation, motor has abnormal vibration and sound, if untimely cutting off the electricity supply, the temperature rise of motor finally burn, so motor phase failure protection is very important too high or smolder or frowziness.Prior electric machine phase-lacking protective device only is applicable to the separate unit motor, can not realize the Synchronization Control of multiple motors, and the maintenance of existing protective device is cumbersome comparatively speaking, and this installation cost is more expensive.
The utility model content
To the deficiency that exists in the above-mentioned prior art, the utility model proposes a kind of motor unit open phase protector, has solved the Synchronization Control that existing protective circuit can not realize multiple electric motors, and the phase shortage indication is arranged, and is easy to use, low cost of manufacture and easy to maintenance.
The utility model has adopted following technical scheme to realize: the motor unit open phase protector; Comprise reference sensor, transducer, voltage comparator circuit, relay, reset switch, power supply circuits, control circuit; It is characterized in that: the input at three phase mains is provided with reference sensor; Reference sensor is to be made up of three substitutional resistance parallel connections, is connected with three phase mains after reference sensor takes out the neutral point of three-phase alternating voltage; Input at every motor is connected to transducer; Transducer is to be made up of three substitutional resistance parallel connections; Alternating voltage output is after transducer takes out the artificial neutral point of alternating voltage, inserts diode, voltage-stabiliser tube, motor controllable silicon successively at the input of each transducer; Voltage comparator circuit one end connects reference sensor and transducer, and the other end is connected with power supply circuits through relay, reset switch; Any two are connected in control circuit and the three phase mains.
Said voltage comparator circuit is to be made up of diode, voltage-stabiliser tube, motor controllable silicon, resistance, electric capacity, controllable silicon connection in series-parallel, and wherein the loop of resistance, capacitances in series composition is connected between motor silicon controlled gate pole and the controllable silicon.
Described power supply circuits are made up of transformer, rectifier bridge and electric capacity, and the input of transformer is connected with any two of three phase mains respectively, and the output of transformer is connected with rectifier bridge.
Said control circuit is made up of relay normally open switch, contact coil, contact coil normally closed switch.
In order to show that phase shortage appears in motor, be in series with indicator light at each motor silicon controlled emitter-base bandgap grading.
Said motor controllable silicon is a small-power fast controllable silicon
Said controllable silicon is a small-power fast controllable silicon.
[0011]Compared with prior art, the utlity model has following useful technique effect:
1. the open-phase protection circuit that proposes of the utility model; The open-phase protection that can be used for multiple motors simultaneously; If wherein open-phase fault appears in a motor, then can realize automatic trip to part or even all motors, with the safety of protection whole production according to the condition of production; 2. compare with existing protective device, this protector installation, debugging, maintenance and repair are all very simple, and have circuit simple, realize cost advantage lower, easy to use.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model.
Embodiment
With reference to accompanying drawing, the utility model is done further to specify.
As shown in Figure 1; A, B, C are the input of three phase mains; The concrete connection of motor unit (is example with one group of motor): motor M1 is connected with three of three phase mains through fuse RD1, the switch DK1 of three parallel connections; The input of motor M1 inserts the transducer of being made up of three parallel resistance R1, and the output of transducer is connected with diode D1, voltage-stabiliser tube DW1, motor controllable silicon KP1 successively.Input A, B, C at three phase mains are provided with reference sensor, and reference sensor is by three substitutional resistance R
0Parallel connection constitutes, and is connected with three phase mains after reference sensor takes out the neutral point O of three-phase alternating voltage; Input at motor M1 is connected to transducer, and transducer is to be made up of three substitutional resistance R1 parallel connection, and alternating voltage output is after transducer takes out the artificial neutral point O of alternating voltage
1, insert diode D1, voltage-stabiliser tube DW1, motor controllable silicon KP1 successively at the input of transducer; Voltage comparator circuit one end connects reference sensor and transducer, and the other end is connected with power supply circuits through relay J, reset switch T; Any two are connected in control circuit and the three phase mains.
Voltage comparator circuit is by diode D1 ~ Dn, voltage-stabiliser tube DW1 ~ DWn, motor controllable silicon KP1 ~ KPn, the first resistance r
0, the second resistance r, first capacitor C
0, controllable silicon KP connection in series-parallel constitutes, and wherein diode, voltage-stabiliser tube, motor controllable silicon are connected on the output of transducer, the first resistance r
0, the second resistance r, first capacitor C
0The loop that is composed in series is connected between motor silicon controlled gate pole and the controllable silicon KP; Be in series with indicator light at each motor silicon controlled emitter-base bandgap grading; Motor controllable silicon, controllable silicon KP are small-power fast controllable silicon.
Power supply circuits are made up of transformer B, rectifier bridge Z and second capacitor C 1, the input of transformer B through K switch and fuse respectively with three phase mains any two mutually (like A, B phase) be connected, the output of transformer B is connected with rectifier bridge Z.
Control circuit is made up of relay normally open switch, contact coil C, contact coil normally closed switch.
A, B, C three-phase alternating voltage are via three resistance R of reference sensor
0, the neutral point O of taking out three-phase alternating voltage is and by via the artificial neutral point O that takes out alternating voltage behind three equivalent accurate parallelly connected transducers that constitute of resistance R
1Compare, if its neutral point O and neutral point O phase shortage appears, in motor M1
1Have certain voltage difference, be added to the gate pole of small-power fast controllable silicon KP1 so just have the default phase signal electric current through diode D1, voltage-stabiliser tube DW1, trigger the KP1 conducting, signal lamp X1 is bright; Simultaneously by the first resistance r
0On voltage is provided, have electric current through the second resistance r to first capacitor C
0C is worked as in charging
0On voltage when rising to the gate trigger voltage of small-power fast controllable silicon KP, the KP conducting, the relay J coil gets; In the control circuit relay normally open switch J closed, contact coil C gets electric, its contact C opens; All controlled motor tripping operations, whole production continuation equipment is protected.
The size that changes the second resistance r just can change first capacitor C
0The time that voltage rises, thereby the triggering and conducting time of change KP.After treating that the phase shortage motor is fixed, press SR T, open-phase protection circuit drops into normal operating conditions again.The resistance that constitutes three resistance of artificial neutral point should be accomplished unanimity as far as possible, and to select precision for use be 0.5% precision metallic film resistance, can reduce the normal electrical pressure reduction of motor neutral point and benchmark neutral point O like this, guarantees action message after the motor phase shortage.Voltage-stabiliser tube DW
1~ DW
nBurning voltage must be appropriate, the breakdown controllable silicon that makes triggers when guaranteeing above-mentioned normal electrical pressure reduction, motor unit obtains reliably protecting.Practice shows that the burning voltage of this voltage-stabiliser tube just can have been worked reliably between 10 ~ 20 volts.
Claims (7)
1. motor unit open phase protector; Comprise reference sensor, transducer, voltage comparator circuit, relay J, reset switch T, power supply circuits, control circuit; It is characterized in that: the input at three phase mains is provided with reference sensor, and reference sensor is by three substitutional resistance R
0Parallel connection constitutes, and is connected with three phase mains after reference sensor takes out the neutral point O of three-phase alternating voltage; Input at every motor is connected to transducer, and transducer is to be made up of three substitutional resistance parallel connections, and alternating voltage output is after transducer takes out the artificial neutral point O of alternating voltage
1, insert diode, voltage-stabiliser tube, motor controllable silicon successively at the input of each transducer; Voltage comparator circuit one end connects reference sensor and transducer, and the other end is connected with power supply circuits through relay J, reset switch T; Any two are connected in control circuit and the three phase mains.
2. motor unit open phase protector according to claim 1 is characterized in that: said voltage comparator circuit is by diode, voltage-stabiliser tube, motor controllable silicon, the first resistance r
0, the second resistance r, first capacitor C
0, controllable silicon KP connection in series-parallel constitutes, the first resistance r wherein
0, the second resistance r, first capacitor C
0The loop that is composed in series is connected between motor silicon controlled gate pole and the controllable silicon KP.
3. motor unit open phase protector according to claim 1; It is characterized in that: described power supply circuits are made up of transformer B, rectifier bridge Z and second capacitor C 1; The input of transformer B is connected with any two of three phase mains respectively, and the output of transformer B is connected with rectifier bridge Z.
4. motor unit open phase protector according to claim 1 is characterized in that: said control circuit is made up of relay normally open switch, contact coil C, contact coil normally closed switch.
5. motor unit open phase protector according to claim 1 and 2 is characterized in that: be in series with indicator light at each motor silicon controlled emitter-base bandgap grading.
6. motor unit open phase protector according to claim 1 and 2 is characterized in that: said motor controllable silicon is a small-power fast controllable silicon.
7. motor unit open phase protector according to claim 2 is characterized in that: said controllable silicon KP is a small-power fast controllable silicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120511787 CN202435010U (en) | 2011-12-09 | 2011-12-09 | Open phase protector of motor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120511787 CN202435010U (en) | 2011-12-09 | 2011-12-09 | Open phase protector of motor unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435010U true CN202435010U (en) | 2012-09-12 |
Family
ID=46784419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120511787 Expired - Fee Related CN202435010U (en) | 2011-12-09 | 2011-12-09 | Open phase protector of motor unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426136A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Phase loss control device of three-phase motor |
-
2011
- 2011-12-09 CN CN 201120511787 patent/CN202435010U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426136A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Phase loss control device of three-phase motor |
| CN104426136B (en) * | 2013-08-23 | 2018-10-26 | 深圳市海洋王照明工程有限公司 | A kind of phase shortage control device of threephase motor |
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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: 20120912 Termination date: 20131209 |