CN207021664U - A kind of motor protecter - Google Patents
A kind of motor protecter Download PDFInfo
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- CN207021664U CN207021664U CN201720935784.6U CN201720935784U CN207021664U CN 207021664 U CN207021664 U CN 207021664U CN 201720935784 U CN201720935784 U CN 201720935784U CN 207021664 U CN207021664 U CN 207021664U
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Abstract
The utility model discloses a kind of motor protecter, including terminal box, protector shell, control circuit and tripping mechanism, terminal box is arranged on motor, protector shell is located in terminal box, control circuit is provided with protector shell, control circuit includes current detection circuit, lack detection circuit, current protection adjusts circuit, temperature protection circuit, trip circuit, power circuit and tripping mechanism, the current detection circuit and motor lead-out wire, lack detection circuit, current protection regulation circuit is connected, lack detection circuit, current protection regulation circuit connection trip circuit, temperature protection circuit is connected with trip circuit, power circuit is connected with trip circuit, trip circuit is connected with tripping mechanism.Motor protecter carries out intelligent decision according to the electric current that current detection circuit detects to motor, and when judging that the operating mode of non-security operation occurs in motor, motor protecter is powered to tripping mechanism, is threaded off, and motor power is cut off, so as to protect motor.
Description
Technical field
Machine field is the utility model is related to, more particularly to a kind of motor protecter.
Background technology
Threephase asynchronous is widely used in industrial and agricultural production life, largely as blower fan, water pump, compressor etc.
The power source of major mechanical driving, be it is a kind of produce, all very big electronic product of sales volume, to national economy, energy-conservation and environmental protection etc.
Every field has extremely close relationship and important influence, has played indispensable and irreplaceable effect.Asynchronous
During the use of motor, due to multiple reasons such as environment temperature, humidity, dust, machine winding insulation ag(e)ing may be caused
The even failure such as breakdown, influence the normal operation of equipment.In addition when the operating mode of motor load changes, it is possible to create serious
Situations such as overload or even stall, and then cause motor or circuit to burn.It may determine that by measurement motor running current
Which kind of running situation motor is in.
Motor protecter common at present is thermal protector or overload protective device, and its thermal protector principle is：Thermal protector
When reaching the specified take-off temperature value of bimetallic element inside thermal protector by the medium temperature of induction machine, bimetallic element
Action, cut-out leave the motor off work by the electric current of motor coil；When protector ambient temperature drops to bimetallic member
During the specified reset temperature value of part, bimetallic element homing action, being again switched on current of electric makes its work, and such motor is in
In the circulation of heating/disconnection → cooling/connection.The principle of overload protective device is：By the current anomaly of protector become ambassador its
Bimetallic element heating acts, and cut-out leaves the motor off work by the input power of motor.
Know above, thermal protector belongs to temperature sensor protection motor, during to motor rotation blockage or phase shortage electric current moment become big
Caused damage can not sensitivity protection device；And overload protective device is typically external, not only volume is big, installation cost is high, and
And it slow to motor temperature rise can not raise and protect.
Therefore the security that existing motor manufacturer is higher in order to which motor has, it has to while protect thermal protector and overload
Shield device is used in series, although subject the reality pain that installation is complicated, cost is high, but still can not thoroughly solve the security of motor
Problem.
The content of the invention
In order to solve the above-mentioned technical problem, the utility model provides a kind of motor simple in construction, stable and reliable in work and protected
Protect device.
The technical scheme that the utility model solves the above problems is：A kind of motor protecter, it is characterised in that：Including wiring
Box, protector shell, control circuit and tripping mechanism, the terminal box are arranged on motor, and protector shell is located in terminal box, are protected
Control circuit is provided with shield device shell, motor lead-out wire is stretched into protector shell, and control circuit electrically connects with motor lead-out wire, described
Control circuit include current detection circuit, lack detection circuit, current protection regulation circuit, temperature protection circuit, trip circuit,
Power circuit and tripping mechanism, the input of the current detection circuit are connected with motor lead-out wire, current detection circuit it is defeated
Go out end respectively the input with lack detection circuit, current protection regulation circuit input be connected, lack detection circuit it is defeated
Go out end, the output end connection trip circuit of current protection regulation circuit, temperature protection circuit is connected with trip circuit, the power supply
Circuit is connected with trip circuit, and trip circuit is connected with tripping mechanism, the break-make of trip circuit controlling power circuit, so as to control
The working condition of tripping mechanism.
Above-mentioned motor protecter, the current detection circuit include the first current transformer, the second current transformer, the 3rd
Current transformer, the 3rd diode, the 7th diode, the tenth diode, the 4th electric capacity, the 5th electric capacity and the 7th electric capacity, first
Current transformer, the second current transformer, the 3rd current transformer are separately mounted to motor three-phase windings leading-out terminal, the first electric current
Transformer, the second current transformer, the 3rd current transformer signal output part respectively with the 3rd diode, the 7th diode,
The positive pole of tenth diode is connected, the 4th electric capacity, the 5th electric capacity, the 7th electric capacity one end respectively with the 3rd diode, the seven or two
Pole pipe, the negative pole of the tenth diode are connected, and the 3rd diode, the 7th diode, the other end of the tenth diode are grounded.
Above-mentioned motor protecter, the lack detection circuit include the tenth resistance, the 11st resistance, the 12nd resistance, the
14 resistance, the 17th resistance, the second triode, the 3rd triode, the 4th triode, the second diode, the two or three pole
The base stage of pipe is followed by the negative pole of the 3rd diode through the 11st resistance, the colelctor electrode of the second triode through the tenth resistance be followed by
The positive pole of second diode, one end of the 12nd resistance connect the positive pole of the second diode, the emitter stage of the second triode and the
The colelctor electrode of three triodes is connected, and the base stage of the 3rd triode is followed by the negative pole of the 7th diode through the 14th resistance, and the 3rd
The emitter stage of triode is connected with the colelctor electrode of the 4th triode, and the base stage of the 4th triode is followed by the tenth through the 17th resistance
The negative pole of diode, the grounded emitter of the 4th triode.
Above-mentioned motor protecter, the temperature protection circuit include 3rd resistor, the 4th resistance, the 7th resistance, the second electricity
Hold, temperature switch, a termination high level of the 3rd resistor, the other end of 3rd resistor is successively through temperature switch, the 4th electricity
Resistance is followed by the negative pole of the second diode, an end of the 7th resistance being connected between the 4th resistance and the negative pole of the second diode, the
The other end ground connection of seven resistance, the second electric capacity are attempted by the 7th resistance both ends.
Above-mentioned motor protecter, the current protection regulation circuit include the 4th diode, the 5th diode, the 13rd electricity
Resistance, the 16th resistance, the 18th resistance, the 19th resistance, piezo-resistance, the 6th electric capacity, the 6th diode, the 8th diode and
9th diode, the positive pole of the 4th diode are connected with the negative pole of the 3rd diode, the positive pole of the 5th diode and the seven or two pole
The negative pole of pipe is connected, and the negative pole of the 4th diode and the negative pole of the 5th diode link together and be connected to the another of the 12nd resistance
One end, the other end of the 12nd resistance are grounded after the 13rd resistance, piezo-resistance, the 19th resistance successively, the 9th diode
Positive pole be connected to the control terminal of piezo-resistance, the negative pole of the 9th diode is grounded after the 16th resistance, the 18th resistance, the 6th
Electric capacity is attempted by the 18th resistance both ends, and the negative pole of the 8th diode is connected between the 16th resistance and the 18th resistance, and the 8th
The positive pole of diode is connected with the positive pole of the 6th diode, and the negative pole of the 6th diode is connected to the negative pole of the second diode.
Above-mentioned motor protecter, the trip circuit include the first diode, relay and the first triode, and described first
The grounded emitter of triode, the base stage of the first triode are connected between the 4th resistance and the 7th resistance, the collection of the first triode
Electrode is connected between 3rd resistor and temperature switch, and the positive pole of the first diode is connected with the colelctor electrode of the first triode, and first
The negative pole of diode connects high level, and the coil of relay is attempted by the first diode both ends, and the normally opened contact of relay is serially connected in
In power circuit, the power coil concatenation of tripping mechanism is in a power.
The beneficial effects of the utility model are：The electricity that control circuit of the present utility model detects according to current detection circuit
Stream carries out intelligent decision to motor, and when judging that the operating mode of non-security operation occurs in motor, control circuit is powered to tripping mechanism,
Threaded off, cut off motor power, so as to protect motor, there is three-phase current detection, pile defection, predetermined overload, overheat to protect
Protective function.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structured flowchart of control circuit in Fig. 1.
Fig. 3 is the circuit diagram of control circuit in Fig. 1.
Embodiment
The utility model is further described with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of motor protecter, including terminal box, protector shell, control circuit and tripping mechanism, wiring
Box includes terminal box top cover 1 and terminal box base 5, and the terminal box is arranged on motor 7, and protector shell includes protector top cover
2 and protector base 4, protector shell be located in terminal box, is provided with control circuit 3 in protector shell, motor lead-out wire 6 stretches into guarantor
Protect in device shell, control circuit electrically connects with motor lead-out wire 6, and the control circuit includes current detection circuit, pile defection electricity
Road, current protection regulation circuit, temperature protection circuit, trip circuit, power circuit and tripping mechanism, the current detection circuit
Input be connected with motor lead-out wire, the output end of the current detection circuit input with lack detection circuit, electric current respectively
The input of protection regulation circuit is connected, and the output end of lack detection circuit, the output end connection of current protection regulation circuit are de-
Circuit is detained, temperature protection circuit is connected with trip circuit, and the power circuit is connected with trip circuit, trip circuit and dropout machine
Structure is connected, the break-make of trip circuit controlling power circuit, so as to control the working condition of tripping mechanism.
Power circuit is made up of R1, C1, R2, Z1, C3, R6, T1, R5, R9, and R1, C1, R2 form capacitance-resistance voltage reduction circuit, Z1
Rectification, R6, T1, R5, R9 form mu balanced circuit, and actual VCC is+5V power supplys.
As shown in Fig. 2 the current detection circuit includes the first current transformer TA1, the second current transformer TA2, the
Three current transformer TA3, the 3rd diode D3, the 7th diode D7, the tenth diode D10, the 4th electric capacity C4, the 5th electric capacity C5
It is separately mounted to the 7th electric capacity C7, the first current transformer TA1, the second current transformer TA2, the 3rd current transformer TA3
Motor M three-phase windings leading-out terminals, the first current transformer TA1, the second current transformer TA2, the 3rd current transformer TA3 letter
Number positive pole of the output end respectively with the 3rd diode D3, the 7th diode D7, the tenth diode D10 is connected, the 4th electric capacity C4,
Five electric capacity C5, the 7th electric capacity C7 one end respectively with the 3rd diode D3, the 7th diode D7, the tenth diode D10 negative pole
It is connected, the 3rd diode D3, the 7th diode D7, the tenth diode D10 other end are grounded.Examined per phase current by transformer
Survey, through diode rectification, filtered to capacitance energy storage, realize that current signal is changed into voltage signal.
The lack detection circuit includes the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 14th electricity
R14, the 17th resistance R17, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, the second diode D2 are hindered, it is described
Second triode Q2 base stage is followed by the 3rd diode D3 negative pole through the 11st resistance R11, the second triode Q2 current collection
The resistance R10 of pole the tenth is followed by connecting the second diode D2's to the second diode D2 positive pole, the 12nd resistance R12 one end
Positive pole, the second triode Q2 emitter stage are connected with the 3rd triode Q3 colelctor electrode, and the 3rd triode Q3 base stage is through the tenth
Four resistance R14 are followed by the 7th diode D7 negative pole, the 3rd triode Q3 emitter stage and the 4th triode Q4 colelctor electrode
It is connected, the 4th triode Q4 base stage is followed by the tenth diode D10 negative pole through the 17th resistance R17, the 4th triode Q4
Grounded emitter.There is no the second triode Q2, the 3rd triode Q3, the 4th triode Q4 during phase shortage to all turn on, the tenth electricity
The intersection point voltage hindered between R10, the 12nd resistance R12, the second diode D2 is very low, is insufficient to allow the second positive guides of diode D2
It is logical, if there is phase shortage, then the second triode Q2, the 3rd triode Q3, the 4th triode Q4 at least one can not turn on, then
Intersection point voltage between tenth resistance R10, the 12nd resistance R12, the second diode D2 can be higher, and the second diode D2 can be just
To conducting, and the first triode operation is driven, protection act performs.
The temperature protection circuit includes 3rd resistor R3, the 4th resistance R4, the 7th resistance R7, the second electric capacity C2, temperature
Switch t2, a termination high level VCC of the 3rd resistor R3, the 3rd resistor R3 other end is successively through temperature switch t2, the
Four resistance R4 are followed by being connected on the 4th resistance R4 and the second diode D2 to the second diode D2 negative pole, a 7th resistance R7 end
Negative pole between, the 7th resistance R7 other end ground connection, the second electric capacity C2 is attempted by the 7th resistance R7 both ends.If temperature exceedes
Protection value, then VCC connect partial pressure through the 7th resistance R7 and 3rd resistor R3, the 4th resistance R4 so as to drive the first triode Q1
Work.
The current protection regulation circuit includes the 4th diode D4, the 5th diode D5, the 13rd resistance R13, the tenth
Six resistance R16, the 18th resistance R18, the 19th resistance R19, piezo-resistance RV1, the 6th electric capacity C6, the 6th diode D6,
Eight diode D8 and the 9th diode D9, the 4th diode D4 positive pole are connected with the 3rd diode D3 negative pole, the five or two pole
Pipe D5 positive pole is connected with the 7th diode D7 negative pole, and the 4th diode D4 negative pole is connected with the 5th diode D5 negative pole
Together and the 12nd resistance R12 other end is connected to, the 12nd resistance R12 other end is successively through the 13rd resistance R13, pressure
It is grounded after quick resistance RV1, the 19th resistance R19, the 9th diode D9 positive pole is connected to piezo-resistance RV1 control terminal, and the 9th
Diode D9 negative pole is grounded after the 16th resistance R16, the 18th resistance R18, and the 6th electric capacity C6 is attempted by the 18th resistance
R18 both ends, the 8th diode D8 negative pole are connected between the 16th resistance R16 and the 18th resistance R18, the 8th diode D8's
Positive pole is connected with the 6th diode D6 positive pole, and the 6th diode D6 negative pole is connected to the second diode D2 negative pole.
The trip circuit includes the first diode D1, relay K1 and the first triode Q1, the first triode Q1
Grounded emitter, the first triode Q1 base stage is connected between the 4th resistance R4 and the 7th resistance R7, the first triode Q1's
Colelctor electrode is connected between 3rd resistor R3 and temperature switch t2, the first diode D1 positive pole and the first triode Q1 colelctor electrode
It is connected, the first diode D1 negative pole meets high level VCC, and relay K1 coil is attempted by the first diode D1 both ends, relay
In a power, the power coil L1 concatenations of tripping mechanism are in a power for device K1 normally opened contact concatenation.If any signal
The first triode Q1 is triggered, then relay K1 is worked, the power coil L1 of tripping mechanism is switched on 380V power supplys, and electrical apparatus release is inhaled
Close, trip action.
Operation principle of the present utility model is as follows：By current detection circuit, after current signal is converted into voltage signal
Exported by D4, D5, this two-way electric current be in parallel relationship, is connected after parallel connection with R12, R13, and voltage signal is toward R12 branch road sides
To open-phase protection is mainly used in when passing through, it is mainly used in overload protection when passing through toward R13 branch roads direction.Voltage signal through R13,
RV1, R19 are to power source reference point.By adjusting RV1, with regard to D9 anode voltages can be changed, the voltage after D9, R16, C6, R18,
A current setting is obtained, when the setting valve is more than D8, D6 and Q1 work threshold voltage, Q1 work, dropout protection act is held
OK, wherein D8 is 3.3V voltage-regulator diode.It by changing the ratio of resistance value above and below RV1, can adapt to the control circuit
Electric motor protecting requirement under different capacity, different operating modes.The segmented that C6, C2, C4, C5, C7 in Fig. 3 constitute motor is protected
Shield, specifically by detection three-phase current, compared with setting Rated motor electric current, if detection electric current is less than Rated motor electric current
Do not protect, such as detect electric current within 1.2 times of rated current, as long as motor operation temperature allows, protection is also failure to actuate, and is detected
Electric current, if the duration is more than time delay, is protected in 1.2 times to 1.5 times of rated current, if the duration is few
Do not protected in allowed band in the time delay and electric machine iron core temperature.When detecting more than more than 1.5 times rated current of electric current,
If the duration is more than the overload delay protection time, protection act, if the duration is less than the delay protection time
And electric machine iron core temperature is not protected in allowed band.When detection electric current is more than 2 times of rated current, delay 10S protections.Motor goes out
Existing stall or it is short-circuit when, operating time of protection is less than 3S.Judge whether power supply phase shortage occurs by current detecting, during open-phase protection
Between be less than 1S.At any moment, if the iron core temperature of detection motor exceedes the maximum operation temperature that motor allows, protected in 1S
Mechanism action.Circuit has automatic identification electric motor starting overcurrent process, and normal start and stop motor protector is failure to actuate.
Claims (6)
- A kind of 1. motor protecter, it is characterised in that：It is described to connect including terminal box, protector shell, control circuit and tripping mechanism Line box is arranged on motor, and protector shell is located in terminal box, is provided with control circuit in protector shell, motor lead-out wire stretches into guarantor Protect in device shell, control circuit electrically connects with motor lead-out wire, and the control circuit includes current detection circuit, pile defection electricity Road, current protection regulation circuit, temperature protection circuit, trip circuit, power circuit and tripping mechanism, the current detection circuit Input be connected with motor lead-out wire, the output end of the current detection circuit input with lack detection circuit, electric current respectively The input of protection regulation circuit is connected, and the output end of lack detection circuit, the output end connection of current protection regulation circuit are de- Circuit is detained, temperature protection circuit is connected with trip circuit, and the power circuit is connected with trip circuit, trip circuit and dropout machine Structure is connected, the break-make of trip circuit controlling power circuit, so as to control the working condition of tripping mechanism.
- 2. motor protecter according to claim 1, it is characterised in that：It is mutual that the current detection circuit includes the first electric current Sensor, the second current transformer, the 3rd current transformer, the 3rd diode, the 7th diode, the tenth diode, the 4th electric capacity, 5th electric capacity and the 7th electric capacity, the first current transformer, the second current transformer, the 3rd current transformer are separately mounted to motor Three-phase windings leading-out terminal, the first current transformer, the second current transformer, the 3rd current transformer signal output part respectively with 3rd diode, the 7th diode, the positive pole of the tenth diode are connected, the 4th electric capacity, the 5th electric capacity, one end point of the 7th electric capacity Negative pole not with the 3rd diode, the 7th diode, the tenth diode is connected, the 3rd diode, the 7th diode, the 12nd pole The other end of pipe is grounded.
- 3. motor protecter according to claim 2, it is characterised in that：The lack detection circuit include the tenth resistance, 11st resistance, the 12nd resistance, the 14th resistance, the 17th resistance, the second triode, the 3rd triode, the 4th triode, Second diode, the base stage of second triode are followed by the negative pole of the 3rd diode through the 11st resistance, the second triode Colelctor electrode be followed by through the tenth resistance to the positive pole of the second diode, one end of the 12nd resistance is connecting the second diode just Pole, the emitter stage of the second triode are connected with the colelctor electrode of the 3rd triode, and the base stage of the 3rd triode is after the 14th resistance The negative pole of the 7th diode is connected to, the emitter stage of the 3rd triode is connected with the colelctor electrode of the 4th triode, the 4th triode Base stage is followed by the negative pole of the tenth diode through the 17th resistance, the grounded emitter of the 4th triode.
- 4. motor protecter according to claim 3, it is characterised in that：The temperature protection circuit include 3rd resistor, 4th resistance, the 7th resistance, the second electric capacity, temperature switch, the 3rd resistor one termination high level, 3rd resistor it is another End is followed by the negative pole of the second diode through temperature switch, the 4th resistance successively, an end of the 7th resistance be connected on the 4th resistance with Between the negative pole of second diode, the other end ground connection of the 7th resistance, the second electric capacity is attempted by the 7th resistance both ends.
- 5. motor protecter according to claim 4, it is characterised in that：The current protection regulation circuit includes the four or two Pole pipe, the 5th diode, the 13rd resistance, the 16th resistance, the 18th resistance, the 19th resistance, piezo-resistance, the 6th electricity Appearance, the 6th diode, the 8th diode and the 9th diode, the positive pole of the 4th diode are connected with the negative pole of the 3rd diode, The positive pole of 5th diode is connected with the negative pole of the 7th diode, and the negative pole of the 4th diode is connected with the negative pole of the 5th diode Together and the other end of the 12nd resistance is connected to, the other end of the 12nd resistance is successively through the 13rd resistance, piezo-resistance, It is grounded after 19 resistance, the positive pole of the 9th diode is connected to the control terminal of piezo-resistance, and the negative pole of the 9th diode is through the 16th It is grounded after resistance, the 18th resistance, the 6th electric capacity is attempted by the 18th resistance both ends, and the negative pole of the 8th diode is connected on the 16th Between resistance and the 18th resistance, the positive pole of the 8th diode is connected with the positive pole of the 6th diode, the negative pole of the 6th diode It is connected to the negative pole of the second diode.
- 6. motor protecter according to claim 4, it is characterised in that：The trip circuit include the first diode, after Electrical equipment and the first triode, the grounded emitter of first triode, the base stage of the first triode are connected on the 4th resistance and Between seven resistance, the colelctor electrode of the first triode is connected between 3rd resistor and temperature switch, the positive pole of the first diode and The colelctor electrode of one triode is connected, and the negative pole of the first diode connects high level, and the coil of relay is attempted by the first diode two End, in a power, the power coil concatenation of tripping mechanism is in a power for the normally opened contact concatenation of relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720935784.6U CN207021664U (en) | 2017-07-31 | 2017-07-31 | A kind of motor protecter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720935784.6U CN207021664U (en) | 2017-07-31 | 2017-07-31 | A kind of motor protecter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207021664U true CN207021664U (en) | 2018-02-16 |
Family
ID=61482380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720935784.6U Active CN207021664U (en) | 2017-07-31 | 2017-07-31 | A kind of motor protecter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207021664U (en) |
-
2017
- 2017-07-31 CN CN201720935784.6U patent/CN207021664U/en active Active
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Address after: 411100 Yuhu District, Xiangtan City, Hunan Province, No. 199, Great Wall Xiangtan Shao Road, 4 7-10 facades of Zhongnan Agricultural Machinery and Electrical Market Patentee after: Hunan Gubo Electromechanical Co.,Ltd. Address before: 411101 Building 4, Zhongnan Agricultural Machinery Electromechanical Market, No. 199, Tanshao Road, Changcheng Township, Yuhu District, Xiangtan, Hunan Province Patentee before: HUNAN SOLID BO ELECTROMECHANICAL CO.,LTD. |