CN2306603Y - Phase interruption protector for AC motor - Google Patents
Phase interruption protector for AC motor Download PDFInfo
- Publication number
- CN2306603Y CN2306603Y CN 97221529 CN97221529U CN2306603Y CN 2306603 Y CN2306603 Y CN 2306603Y CN 97221529 CN97221529 CN 97221529 CN 97221529 U CN97221529 U CN 97221529U CN 2306603 Y CN2306603 Y CN 2306603Y
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- CN
- China
- Prior art keywords
- phase
- contactor
- volts
- motor
- alternating current
- 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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Abstract
The utility model relates to a phase interruption protector for alternating current motors, which is suitable for the safe control on the starting and the stopping of squirrel-cage motors with medium and small capacity. The utility model is characterized in that the starting and stopping control device of the existing squirrel-cage motor is changed from a three-phase three-wire system power supply into a three-phase four-wire system power supply; a phase interruption protection alternating current contactor of 220V is connected between the neutral line and the other phase wire except the two phase wires used by an alternating current contactor of 380V. The utility model obtains the effect that no matter the phenomenon of phase interruption occurs in any phase wire, the three phase wires can be simultaneously disconnected and the safety of the motor is ensured. The utility model is an ideal device for the safe control on the starting and the stopping of the motor.
Description
The utility model relates to the driving of various plant equipment, specially refers to a kind of alternating current motor open phase protection.The security control of the electronic running of low capacity squirrel-cage in being applicable to is particularly useful for the starting, speed governing, rotating of the complete middle low capacity squirrel-cage motor of protecting mutually of needs, the security control that stops.
The starting of the at present domestic middle low capacity squirrel-cage motor that generally uses, speed governing, rotating, stop control, as disclosed technology in electrotechnics one book, its starting, stop control are by three-phase three-wire system power supply (A, B, C), air switch (HK), fuse (RD), 380 volts A.C. contactor (JC
A), thermal relay (RJ), squirrel-cage motor (D), starting button (QA) stop button (TA) form, (seeing Figure of description one) this control device exists phase line entirely that motor is carried out the shortcoming of open phase protection; when this shortcoming is exactly another root phase line outside phase failure phenomenon occurs in two phase lines that 380 volts A.C. contactor uses; can not make three phase line phases failure simultaneously; the phenomenon that motor is burnt often occurs, have a strong impact on carrying out smoothly of production.
The purpose of this utility model: provide a kind of alternating current motor open phase protection.Starting, stop control to the middle low capacity squirrel-cage motor of present domestic use improve; make it can carry out the protection of full phase line to motor; which root phase line is no matter phase failure phenomenon occur in; three phase lines are opened circuit simultaneously; guarantee the safety of motor, production can successfully be carried out.
To achieve these goals; a kind of invention scheme of alternating current motor open phase protection is: in Figure of description; Fig. 2 provides the electrical schematic diagram of this device; it mainly is made up of three-phase three-wire system power supply (A, B, C), air switch (HK), fuse (RD), 380 A.C. contactor, thermal relay (RJ), squirrel-cage motor (D), starting button (QA), stop button (TA), it is characterized in that the three-phase three-wire system power supply make three-phase four-wire system power supply (N, A, B, C) into, 380 volts A.C. contactor (JC
A) the self-locking contact remove, at 380 volts A.C. contactor (JC
A) the open phase protection A.C. contactor (JC of one 220 volts of accesses between the outer A phase line of employed B, C two phase lines and the N line (center line)
B), its normally open contact and starting button (QA) and be linked together, substitute 380 volts of A.C. contactor (JC
A) the self-locking contact, 220 volts open phase protection A.C. contactor and 380 volts A.C. contactor are made one, 220 volts open phase protection A.C. contactor (JC
B) be by attract line coil (1),
Font fixed core (2),
Font moving (3), normally open contact (4) unshakable in one's determination, normally closed touching (5), spring (6), armature (7) are formed.(seeing Figure of description 3)
Advantage of the present utility model:
The advantage to the open phase protection of the full phase line of motor is compared, had to the utility model with present domestic middle low capacity squirrel-cage motor starting, the stop control that generally uses, no matter phase failure phenomenon occur in which root phase line can both make simultaneously three phase lines open circuit, guarantee motor safely, production can successfully be carried out.Overcome phase failure phenomenon and occurred in 380 volts A.C. contactor (JC
A) during another root phase line beyond two phase lines using, cause motor under the situation of two phase lines, turn round and shortcoming that quilt is burnt.
Explanation to Figure of description one:
Figure of description one is the at present domestic middle low capacity squirrel-cage motor starting of generally using, the electrical schematic diagram of stop control, and (A, B, C) three-phase three-wire system power supply, HK are that air switch, RD are fuse, JC among the figure
AA.C. contactor, the RJ that is 380 volts is that thermal relay, D are that squirrel-cage motor, QA are that starting button, TA are stop button, symbol
The coil of A.C. contactor, symbol are the normally open contact of A.C. contactor and self-locking contact, symbol
Be normally closed interlock, the symbol of thermal relay
Be element, the symbol of thermal relay
Be starting button, symbol
It is stop button.
Explanation to Figure of description two:
Figure of description two is electrical schematic diagrams of the present utility model, and (N, A, B, C) is that three-phase four-wire system power supply, HK are air switches among the figure, and RD is fuse, JC
ABe 380 volts A.C. contactor, JC
BBe 220 volts open phase protection A.C. contactor, D is that squirrel-cage motor, RJ are that thermal relay, QA are that starting button, TA are stop button, symbol
The coil, the symbol that are A.C. contactor are A.C. contactor normally open contact, symbol
Be thermal element, the symbol of thermal relay
Be normally closed interlock, the symbol of thermal relay
Starting button, symbol
It is stop button.Explanation to Figure of description three:
Figure of description three is that (1) is to attract line chart, (2) to be in the organigram, figure of 220 volts open phase protection A.C. contactor
The font fixed core, (3) are
The moving iron core of font, (4) are that normally open contact, (5) are that normally closed interlock, (6) are that spring, (7) are armature.
Embodiment:
With high strength enamelled wire, silicon steel sheet, copper sheet, spring steel wire, iron block, make respectively the line bag,
The moving iron core of font,
Font fixed core, armature, normally open contact, normally closedly close head, spring, then it be assembled in the plastic casing; just form 220 volts open phase protection A.C. contactor; the A.C. contactor of 220 volts open phase protection A.C. contactors and 380 volts is assembled into one, then with the electrical schematic diagram of air switch, fuse, squirrel-cage motor, starting button, stop button by specification accompanying drawing two couple together the alternating current motor open phase protection.
Claims (3)
1. alternating current motor open phase protection is by three-phase three-wire system power supply (A, B, C), air switch (HK), fuse (DR), 380 A.C. contactor (JC
A), thermal relay (RJ), squirrel-cage motor (D), starting button (QA), stop button (TA) form, it is characterized in that the three-phase three-wire system power supply make three-phase four-wire system power supply (N, A, B, C) into, 380 volts A.C. contactor (JC
A) the self-locking contact remove, at 380 volts A.C. contactor (JC
A) the open phase protection A.C. contactor (JC of one 220 volts of accesses between the outer A phase line of employed B, C two phase lines and the N line (center line)
B), its normally open contact and starting button (QA) and be linked together, substituted 380 volts of A.C. contactor (JC
A) the self-locking contact.
2. according to claim 1, described a kind of alternating current motor open phase protection is characterized in that 220 volts open phase protection A.C. contactor and 380 volts A.C. contactor make one.
3. according to claim 1 and 2, described a kind of alternating current motor open phase protection is characterized in that 220 volts open phase protection A.C. contactor (JC
B) form by sucking coil (1), E font fixed core (2), E font moving (3), normally open contact (4) unshakable in one's determination, normally closed interlock (5), spring (6), armature (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221529 CN2306603Y (en) | 1997-07-23 | 1997-07-23 | Phase interruption protector for AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221529 CN2306603Y (en) | 1997-07-23 | 1997-07-23 | Phase interruption protector for AC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2306603Y true CN2306603Y (en) | 1999-02-03 |
Family
ID=33936906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97221529 Expired - Fee Related CN2306603Y (en) | 1997-07-23 | 1997-07-23 | Phase interruption protector for AC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2306603Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
| CN102157918A (en) * | 2011-04-25 | 2011-08-17 | 四川省电力公司达州电业局 | Phase failure and overheating comprehensive protector for motor |
-
1997
- 1997-07-23 CN CN 97221529 patent/CN2306603Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
| CN102157918A (en) * | 2011-04-25 | 2011-08-17 | 四川省电力公司达州电业局 | Phase failure and overheating comprehensive protector for motor |
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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 |