CN201733074U - Economical and practical motor open-phase protection device - Google Patents
Economical and practical motor open-phase protection device Download PDFInfo
- Publication number
- CN201733074U CN201733074U CN2010202410281U CN201020241028U CN201733074U CN 201733074 U CN201733074 U CN 201733074U CN 2010202410281 U CN2010202410281 U CN 2010202410281U CN 201020241028 U CN201020241028 U CN 201020241028U CN 201733074 U CN201733074 U CN 201733074U
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- phase
- motor
- contactor
- alternating current
- economical
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Abstract
The utility model relates to an economical and practical motor open-phase protection device capable of realizing automatic protection to the starting or the running of a motor during the phase failure only through an improvement made to the control circuit for the traditional motor. The economical and practical motor open-phase protection device comprises an alternating current contactor KM1 coil circuit connected between a phase A and a phase B of a motor three-phase line; an alternating current contactor KM2 coil is accessed between the phase A and a phase C of the motor three-phase line; a normally-open contact of an alternating current contactor KM2 is in series connection to the alternating current contactor KM1 coil circuit; and the alternating current contactor KM1 coil circuit comprises a normally-open contact of a starting button SB2 in series connection between the phase A and the phase B of the motor three-phase line, a normally-closed contact of a stop button SB1, and a normally-open contact of the alternating current contactor KM1 connected in parallel with the normally-open contact of the starting button SB2. The motor can be prevented from being burnt out during the phase failure only when an additional alternating current contactor is arranged, so that, the motor open-phase protection device is economical and practical.
Description
Technical field
The utility model relates to a kind of need to carry out some to the control circuit of conventional motors and improves, and can realize the economical and practical open-phase protection device for electromotor that motor phase failure starting or operation are protected automatically.
Background technology
In actual production, usually can run into the situation of the threephase motor phase failure, this harm for motor is very big, even burns motor.Need us to find a kind of simple, effective, economic motor open-phase automatic protection device in the practice for a long time, and only need the control circuit of conventional motors is carried out some improvement, can realize motor phase failure starting or operation are protected automatically.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art and a kind of economical and practical open-phase protection device for electromotor that motor phase failure starting or operation are protected automatically can realized is provided.
Of the present utility modelly be achieved in that a kind of economical and practical open-phase protection device for electromotor; comprise be connected on the motor three-phase line A mutually and the A.C. contactor KM1 coil circuit of B between mutually; it is characterized in that: the A of motor three-phase line mutually and C mutually between incoming transport contactor KM2 coil, and the normally opened contact of its A.C. contactor KM2 sealed in the A.C. contactor KM1 coil circuit.
A.C. contactor KM1 coil circuit comprise be connected on the motor three-phase line A mutually and the normally opened contact of the normally-closed contact of the normally opened contact of the starting button SB2 of B between mutually, stop button SB1 and the A.C. contactor KM1 in parallel with the normally opened contact of starting button SB2.
The utility model only need increase an A.C. contactor, is not burnt not only economy but also practicality in the time of can protecting the motor phase failure.
Description of drawings
Fig. 1 is a circuit connection diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprise be connected on the motor three-phase line A mutually and the A.C. contactor KM1 coil circuit of B between mutually, it is characterized in that: the A of motor three-phase line mutually and C mutually between incoming transport contactor KM2 coil, and the normally opened contact of its A.C. contactor KM2 sealed in the A.C. contactor KM1 coil circuit.
A.C. contactor KM1 coil circuit comprise be connected on the motor three-phase line A mutually and the normally opened contact of the normally-closed contact of the normally opened contact of the starting button SB2 of B between mutually, stop button SB1 and the A.C. contactor KM1 in parallel with the normally opened contact of starting button SB2.
The utility model has added an A.C. contactor KM2 in traditional control circuit, promptly insert the KM2 coil in A, C two-phase, and its normally opened contact is sealed in the former A.C. contactor KM1 coil circuit.Its maximum characteristics are that three phase mains is introduced control circuit simultaneously.
Its operation principle is as follows: earlier with unit switch Q closure, for motor starting is got ready.This moment main circuit and control circuit simultaneously electric, be connected to A, C two alternate ac contactor coil KM2 switch on, iron core is made the normally opened contact KM2 closure that is serially connected on the A.C. contactor KM1 by adhesive.
When pressing starting button SB2, the A.C. contactor KM1 adhesive of switching on, 3 main contacts closures on the main circuit, auxiliary contact self-locking closure, motor M just starts.
When phase shortage appears in motor, if lack A phase or C phase, ac contactor coil KM2 dead electricity, the contact KM2 that is serially connected among the ac contactor coil KM1 disconnects, make ac contactor coil KM1 dead electricity, so self-holding contact disconnects, main contacts also disconnects, motor dead electricity fail to start (this moment is harmless) or shut down; If lack the B phase, ac contactor coil KM1 dead electricity, self-holding contact disconnects, and main contacts disconnects, motor dead electricity, fail to start (this moment is harmless) or shut down.So just guaranteed that motor is not burnt when the circuit phase shortage.
As seen, only needing increases an A.C. contactor, is not burnt not only economy but also practicality in the time of can protecting the motor phase failure.In actual production, usually can run into the situation of the threephase motor phase failure, this harm for motor is very big, even burns motor.Through practice for a long time, we have invented this simple, effective, economic motor open-phase automatic protection device, only need the control circuit of conventional motors is carried out some improvement, can realize motor phase failure starting or operation are protected automatically.
Claims (2)
1. economical and practical open-phase protection device for electromotor; comprise be connected on the motor three-phase line A mutually and the A.C. contactor KM1 coil circuit of B between mutually; it is characterized in that: the A of motor three-phase line mutually and C mutually between incoming transport contactor KM2 coil, and the normally opened contact of its A.C. contactor KM2 sealed in the A.C. contactor KM1 coil circuit.
2. economical and practical open-phase protection device for electromotor according to claim 1 is characterized in that: A.C. contactor KM1 coil circuit comprise be connected on the motor three-phase line A mutually and the normally opened contact of the normally-closed contact of the normally opened contact of the starting button SB2 of B between mutually, stop button SB1 and the A.C. contactor KM1 in parallel with the normally opened contact of starting button SB2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202410281U CN201733074U (en) | 2010-06-29 | 2010-06-29 | Economical and practical motor open-phase protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202410281U CN201733074U (en) | 2010-06-29 | 2010-06-29 | Economical and practical motor open-phase protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733074U true CN201733074U (en) | 2011-02-02 |
Family
ID=43524230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202410281U Expired - Fee Related CN201733074U (en) | 2010-06-29 | 2010-06-29 | Economical and practical motor open-phase protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733074U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895096A (en) * | 2010-06-29 | 2010-11-24 | 河南省电力公司许昌供电公司 | Economical and practical open-phase protection device for electromotor |
-
2010
- 2010-06-29 CN CN2010202410281U patent/CN201733074U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895096A (en) * | 2010-06-29 | 2010-11-24 | 河南省电力公司许昌供电公司 | Economical and practical open-phase protection device for electromotor |
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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: 20110202 Termination date: 20110629 |