CN203352140U - Motor protection circuit - Google Patents
Motor protection circuit Download PDFInfo
- Publication number
- CN203352140U CN203352140U CN 201320335641 CN201320335641U CN203352140U CN 203352140 U CN203352140 U CN 203352140U CN 201320335641 CN201320335641 CN 201320335641 CN 201320335641 U CN201320335641 U CN 201320335641U CN 203352140 U CN203352140 U CN 203352140U
- Authority
- CN
- China
- Prior art keywords
- motor
- resistance
- phase
- piezo
- rsj
- 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 - Lifetime
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Abstract
The utility model relates to a motor protection circuit. A three-phase balancing network is formed by parallel connection of varistors R<V1>, R<V2> and R<V3>, when a three-phase power source is in a balance state, the electric potential of the common point is zero. Pins 1, 2, 3 are respectively connected to a random three-phase commercial power, point 4 is grounded or connected to a null line, so that over-voltage amplitude can be limited by the R<V1>, R<V2> and R<V3> in three windings of a motor mutually, an R<V4> is capable of absorbing or limiting surge current or impulse current through one random phase in a three-phase circuit. When one random phase in the three-phase circuit is opened, the electric potential of the common point rises from 0, a bidirectional solid-state relay SSR is turned on, an AC contactor coil ZJ is cut off, power is off, and the motor is protected. The motor protection circuit can be used for starting control protection, overvoltage protection, phase failure protection and absorption of switch sharp pulse and surge current for a three-phase motor, interference caused by electric spark can be controlled, and service lifetime of the motor can be prolonged.
Description
Technical field
The utility model technology relates to a kind of motor protecting circuit.
Background technology
Current, in prior art, the protection of motor is had to automatic switch, thermal relay, universal current limiting circuit breaker and integrated protector for electric motor etc., but great majority all structure is more complicated, cost of manufacture is high.
The utility model content
Adopt the devices such as thermal relay, universal current limiting circuit breaker and integrated protector for electric motor for motor protection in prior art; complex structure, the defect that cost is higher; it is simple that the utility model aims to provide a kind of formation, processing ease, motor protecting circuit with low cost.
The utility model is also zero principle according to its common port electric current when the three-phase voltage balance, piezo-resistance R
v1, R
v2, R
v3an end parallel connection; form the three-phase equilibrium network, by the piezo-resistance detection means, form protective circuit, be mainly used to threephase motor is started and controls protection, overvoltage protection, open phase protection, absorption switching spike and surge current; control the interference that electric spark causes, extend motor useful life.
Motor protecting circuit described in the utility model; mainly by threephase motor protection module RSJ-II, threephase switch K, insurance RD, start button KS, stop button TA and ac contactor coil ZJ, formed; it is characterized in that: three phase mains is by threephase switch K; each is connected in series respectively an insurance RD mutually, then is connected in series respectively normally opened contact Z
1, Z
2, Z
3and the three-phase of motor D; Normally opened contact Z
1and 3 points of access protection module RSJ-II between motor D; Normally opened contact Z
2and 2 points of access protection module RSJ-II between motor D; Normally opened contact Z
3and between motor D in 1 of access protection module RSJ-II, again with together with the side joint of start button KS and stop button TA; The opposite side of start button KS is connected on normally opened contact Z
3and between insurance RD; The opposite side incoming transport contactor coil ZJ of stop button TA; 4 of the zero line N of the opposite side of ac contactor coil ZJ and power supply and protection module RSJ-II are connected together simultaneously; The control loop of above formation motor protective circuit.
In motor protecting circuit described in the utility model, the components and parts of described threephase motor protection module RSJ-II are configured to: 1 and R
v1, R
1, two-way solid-state relay SSR, R
v5one terminate at together; Piezo-resistance R
v1and resistance R
1parallel connection, piezo-resistance R
v2with resistance R
2parallel connection, piezo-resistance R
v3with resistance R
3parallel connection, these three groups of parallel resistances are connected in parallel again, and common point and piezo-resistance R
v4an end, two-way solid-state relay SSR positive input terminal connect together; Piezo-resistance R
v4the other end and resistance R
4an end, resistance R
5an end, piezo-resistance R
v5the other end with 4 of zero lines, join again after being connected together; Resistance R
4the other end and two-way solid-state relay SSR negative output terminal are connected together; Resistance R
5the other end with together with one of two-way solid-state relay SSR terminates at; 1,2,3 pin are taken over respectively meaning three-phase mains, 4 earthing or zero groundings, R in three windings of motor like this
v1, R
v2, R
v3all can carry out amplitude limit, R to overvoltage each other
v4can absorb or suppress any one surge current or the impulse current occurred mutually in three-phase circuit; In three-phase circuit, any one while disconnecting mutually, and the current potential 0 of common point rises, and two-way solid-state relay SSR conducting, disconnect ac contactor coil ZJ, cut off the electricity supply, and the protection motor.
Motor protecting circuit described in the utility model; form simple; easy and simple to handle; cost is lower; can play and start control protection, overvoltage protection, open phase protection, absorption switching spike and surge current and control the effects such as interference that electric spark causes threephase motor, extend motor useful life.
The accompanying drawing explanation
The circuit theory diagrams that Fig. 1 is protection module RSJ-II
The control principle drawing that Fig. 2 is motor protecting circuit
Embodiment
Below in conjunction with accompanying drawing, the utility model content is described further.
In Fig. 1,1 and R
v1, R
1, two-way solid-state relay SSR, R
v5one terminate at together; Piezo-resistance R
v1and resistance R
1parallel connection, piezo-resistance R
v2with resistance R
2parallel connection, piezo-resistance R
v3with resistance R
3parallel connection, these three groups of parallel resistances are connected in parallel again, and common point and piezo-resistance R
v4an end, two-way solid-state relay SSR positive input terminal connect together; Piezo-resistance R
v4the other end and resistance R
4an end, resistance R
5an end, piezo-resistance R
v5the other end with 4 of zero lines, join again after being connected together; Resistance R
4the other end and two-way solid-state relay SSR negative output terminal are connected together; Resistance R
5the other end with together with one of two-way solid-state relay SSR terminates at; Above these components and parts have formed a complete threephase motor protection module RSJ-II.
Piezo-resistance R
v1, R
v2, R
v3in parallel form the three-phase equilibrium network, when three phase mains, during in poised state, the current potential of its concurrent is zero.Piezo-resistance R
v1, R
v2, R
v3, R
v4form together overpressure protection.Whole circuit is divided into four pin configurations.1,2,3 pin are taken over respectively meaning three-phase mains, 4 earthing or zero groundings, R in three windings of motor like this
v1, R
v2, R
v3all can carry out amplitude limit, R to overvoltage each other
v4can absorb or suppress any one surge current or the impulse current occurred mutually in three-phase circuit.In three-phase circuit, any one while disconnecting mutually, and the current potential 0 of common point rises, and two-way solid-state relay SSR conducting, disconnect ac contactor coil ZJ, cut off the electricity supply, and the protection motor.The R of this protector
v5for protecting two-way solid-state relay SSR and extraneous load to arrange.
In Fig. 2, three phase mains is by threephase switch K, and each is connected in series respectively an insurance RD mutually, then is connected in series respectively normally opened contact Z
1, Z
2, Z
3and the three-phase of motor D.Normally opened contact Z
1and 3 points of access protection module RSJ-II between motor D; Normally opened contact Z
2and 2 points of access protection module RSJ-II between motor D; Normally opened contact Z
3and between motor D in 1 of access protection module RSJ-II, again with together with the side joint of start button KS and stop button TA.The opposite side of start button KS is connected on normally opened contact Z
3and between insurance RD; The opposite side incoming transport contactor coil ZJ of stop button TA; 4 of the zero line N of the opposite side of ac contactor coil ZJ and power supply and protection module RSJ-II are connected together simultaneously.The control loop of above formation motor protective circuit.
Start button KS can be contained on power distribution cabinet.Moment is while pressing start button KS, ac contactor coil ZJ adhesive, normally opened contact Z
1, Z
2, Z
3closure, motor D starts running; When three-phase voltage occurs when uneven or phase shortage occurs, R
v1, R
v2, R
v3public 0 volt of voltage rises, two-way solid-state relay SSR conducting, and ac contactor coil ZJ dead electricity, motor D shuts down, and reaches the purpose of protection motor.
In foregoing circuit, components and parts can be selected by following model: piezo-resistance R
v1, R
v2, R
v3selection standard voltage 250V; Piezo-resistance R
v4selecting voltage is 120V; Piezo-resistance Rv
5selecting voltage is 380V; Piezo-resistance R
v1, R
v2, R
v3, R
v4, Rv
5withstand voltage surge current value all can in 100A, select; It is SP1110 that two-way solid-state relay SSR can select model; Resistance R
1, R
2, R
3optional 1W wire resistor; Resistance R
4, R
5the wire resistor of optional 2W, 200 Ω.
Its Relevant Technology Standards: input nominal voltage 380V; Voltage 1A/250V is controlled in the output conducting; Absorb surge current 100A; Static leakage current≤3mA.
Claims (2)
1. a motor protecting circuit; mainly by threephase motor protection module RSJ-II, threephase switch K, insurance RD, start button KS, stop button TA and ac contactor coil ZJ, formed; it is characterized in that: three phase mains is by threephase switch K; each is connected in series respectively an insurance RD mutually, then is connected in series respectively normally opened contact Z
1, Z
2, Z
3and the three-phase of motor D; Normally opened contact Z
1and 3 points of access protection module RSJ-II between motor D; Normally opened contact Z
2and 2 points of access protection module RSJ-II between motor D; Normally opened contact Z
3and between motor D in 1 of access protection module RSJ-II, again with together with the side joint of start button KS and stop button TA; The opposite side of start button KS is connected on normally opened contact Z
3and between insurance RD; The opposite side incoming transport contactor coil ZJ of stop button TA; 4 of the zero line N of the opposite side of ac contactor coil ZJ and power supply and protection module RSJ-II are connected together simultaneously; The control loop of above formation motor protective circuit.
2. motor protecting circuit as claimed in claim 1, is characterized in that described threephase motor protection module RSJ-II consists of following components and parts: and R at 1
v1, R
1, two-way solid-state relay SSR, R
v5one terminate at together; Piezo-resistance R
v1and resistance R
1parallel connection, piezo-resistance R
v2with resistance R
2parallel connection, piezo-resistance R
v3with resistance R
3parallel connection, these three groups of parallel resistances are connected in parallel again, and common point and piezo-resistance R
v4an end, two-way solid-state relay SSR positive input terminal connect together; Piezo-resistance R
v4the other end and resistance R
4an end, resistance R
5an end, piezo-resistance R
v5the other end with 4 of zero lines, join again after being connected together; Resistance R
4the other end and two-way solid-state relay SSR negative output terminal are connected together; Resistance R
5the other end with together with one of two-way solid-state relay SSR terminates at; 1,2,3 pin are taken over respectively meaning three-phase mains, 4 earthing or zero groundings, R in three windings of motor like this
v1, R
v2, R
v3all can carry out amplitude limit, R to overvoltage each other
v4can absorb or suppress any one surge current or the impulse current occurred mutually in three-phase circuit; In three-phase circuit, any one while disconnecting mutually, and the current potential 0 of common point rises, and two-way solid-state relay SSR conducting, disconnect ac contactor coil ZJ, cut off the electricity supply, and the protection motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320335641 CN203352140U (en) | 2013-06-05 | 2013-06-05 | Motor protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320335641 CN203352140U (en) | 2013-06-05 | 2013-06-05 | Motor protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352140U true CN203352140U (en) | 2013-12-18 |
Family
ID=49751991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320335641 Expired - Lifetime CN203352140U (en) | 2013-06-05 | 2013-06-05 | Motor protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352140U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064641A (en) * | 2017-06-09 | 2017-08-18 | 伍俊 | High-voltage insulating resistance online monitoring alarm instrument and method of work |
-
2013
- 2013-06-05 CN CN 201320335641 patent/CN203352140U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064641A (en) * | 2017-06-09 | 2017-08-18 | 伍俊 | High-voltage insulating resistance online monitoring alarm instrument and method of work |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |
|
| CX01 | Expiry of patent term |