CN207381961U - A kind of three-station motor overload protection device - Google Patents
A kind of three-station motor overload protection device Download PDFInfo
- Publication number
- CN207381961U CN207381961U CN201720945502.0U CN201720945502U CN207381961U CN 207381961 U CN207381961 U CN 207381961U CN 201720945502 U CN201720945502 U CN 201720945502U CN 207381961 U CN207381961 U CN 207381961U
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- motor
- loop
- control
- overload protection
- contactor
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- 230000005611 electricity Effects 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model is related to a kind of three-station motor overload protection devices, and the direct current generator primary work loop that direct current generator is driven to rotate between power positive cathode is connected to including (1)；(2) it is connected between power positive cathode to control the rotating forward control loop of direct current generator forward and reverse and reversion control loop；(3) it is connected between power positive cathode and provides working power and electric current off-limit alarm device protection act output loop to DC current off-limit alarm device.DC current off-limit alarm device directly gathers the curent change of motor main circuit, and setting electric current value is compared with alarm; protection domain has been set when signal code value increases to; then open the normally-closed contact (3,4 contact) of alarm itself; the coil losing electricity of the contactor KM3 to connect with the normally-closed contact; the normally opened main contact for accessing the contactor KM3 in DC MOTOR CONTROL major loop is opened; DC MOTOR CONTROL major loop powers off, and motor stopping achievees the purpose that protection.
Description
Technical field
The utility model is related to a kind of motor overload protection devices, and in particular to a kind of to three-station DC electromotor start
To the effect of overload protection, and with alarm signal output, it can be achieved that the three-station motor overload protection dress of warning function
It puts.
Background technology
Authorization Notice No. is short to disclose a kind of tri-station isolating switch operating mechanism direct current generator in CN202475338U
Braking circuit, such as Fig. 1 are connect, basic motor positive and inverse has been contained in the control loop of three-station motor and has started and makes
Dynamic control loop, breaker and the electric interlock of three-station operation are protected, three-station itself manually with electronic switching
Interlocking electic protection and the short circuit brake circuit for controlling motor.The overload protection of direct current generator is to utilize to control in motor
Former and later two in major loop secondary fuse 1RD, 2RD, when stall overload occurs for motor, main circuit current increase is burnt first
Break secondary fuse, interrupts motor operation by force, the overload protection to motor is realized with this.This protected mode is for motor
Starting current and overload current calculating there are certain requirements, and height is required to the selection of fuse, and be unfavorable for safeguarding, every time after fusing
Need replacing new secondary fuse.
Application for a patent for invention publication No. is to disclose a kind of three-station isolating grounding switch in CN103633891A to operate machine
Structure motor Quick-speed braking arrangement, such as Fig. 2, the present apparatus cannot be mutated using capacitance voltage, thyristor is had ready conditions conducting and two poles
The characteristic of pipe one-way conduction, capacitance is charged, and when capacitance voltage is close to supply voltage, electric motor loop disconnects, and is utilizing connection
To the thyristor of capacitance, conducting braking resistor RM circuits so that motor fast braking changes braking resistor access electric motor loop
Opportunity, destroy the condition that power positive cathode is connected through braking resistor, realize three-station isolating grounding switch operating mechanism
The fast braking of motor.
But this scheme, which simply makes braking resistor RM be connected in parallel to motor M both ends, carries out dynamic braking, according to the conservation of energy
Law, resistance consumption power reduce electric current, can reduce motor speed, but still have electric current in circuit by the way that there is no thoroughly
Disconnect control loop.Therefore, when motor load is still in overload, motor, which remains unchanged, is present with the situation that overheat is burnt, and
And program alarm free function.
Utility model content
In view of the above-mentioned problems, a kind of three-station direct current generator is played the main purpose of the utility model is that providing
The effect of overload protection, and exported with alarm signal, it can be achieved that the three-station motor overload protection device of warning function.
The utility model is to solve above-mentioned technical problem by following technical proposals：A kind of three-station motor mistake
Protective device is carried, the three-station motor overload protection device (1) drives direct current generator to turn between being connected to power positive cathode
Dynamic direct current generator primary work loop；(2) it is connected between power positive cathode to control the rotating forward of direct current generator forward and reverse
Control loop and reversion control loop；(3) it is connected between power positive cathode and provides working power to DC current off-limit alarm device
With DC current off-limit alarm device protection act output loop.
In specific embodiment of the utility model, the DC current off-limit alarm device directly gathers motor main circuit
Curent change setting electric current value is compared with alarm, set protection domain when signal code value increases to, then beaten
The normally-closed contact of opening alarm device itself, the coil losing electricity of the contactor KM3 to connect with the normally-closed contact access direct current generator control
The normally opened main contact of contactor KM3 in major loop processed is opened, the power-off of DC MOTOR CONTROL major loop, motor stopping.
In specific embodiment of the utility model, rotate and reverse control loop and be connected to a division isolation
Control the switch SB1, the control switch SB2 of a division earthing switch of switch rotate forward control contactor KM1, and reversion control connects
Tentaculum KM2.
In specific embodiment of the utility model, electric current off-limit alarm device protection act output loop is out-of-limit by electric current
Alarm action output interface is directly connected to overload protection control contactor KM3.
The positive effect of the utility model is：Three-station motor overload protection dress provided by the utility model
It puts, plays the role of overload protection to three-station direct current generator, and exported with alarm signal, it can be achieved that warning function.
Description of the drawings
Fig. 1 is the circuit diagram of tri-station isolating switch operating mechanism direct current generator short circuit braking in the prior art.
Fig. 2 is the circuit diagram of prompt braking device of three-station isolation grounding switch operating mechanism motor in the prior art.
Fig. 3 is the circuit diagram of three-station motor overload protection device provided by the utility model.
Specific embodiment
The utility model preferred embodiment is provided below in conjunction with the accompanying drawings, the technical solution of the utility model is described in detail.
Fig. 3 is the circuit diagram of three-station motor overload protection device provided by the utility model.As shown in Fig. 3, this
The three-station motor overload protection circuit that utility model provides includes：(1) it is connected between power positive cathode and drives direct current
The direct current generator primary work loop that machine rotates；(2) it is connected between power positive cathode to control direct current generator forward and reverse
Rotate forward control loop and reversion control loop；(3) it is connected between power positive cathode and provides work to DC current off-limit alarm device
Power supply and electric current off-limit alarm device protection act output loop.
DC current off-limit alarm device (see 3 figure medium cloud line parts) directly gathers curent change and the alarm of motor main circuit
Setting electric current value is compared device, has set protection domain when signal code value increases to, has then opened the normal of alarm itself
Closed contact (3,4 contact), the coil losing electricity of the contactor KM3 to connect with the normally-closed contact access DC MOTOR CONTROL major loop
In contactor KM3 normally opened main contact open, DC MOTOR CONTROL major loop power-off, motor stopping.
The control switch SB1 that control loop is connected to a division disconnecting switch is rotated and reverse, a division connects
The control switch SB2 of ground switch, rotates forward control contactor KM1, reversion control contactor KM2.
Electric current off-limit alarm device protection act output loop is by electric current off-limit alarm device action output interface (3,4 contact)
It is directly connected to overload protection control contactor KM3.
Direct current generator primary work loop has concatenated the normally opened contact of KM1 and KM2 in motor positive and negative terminal, plays normal control electricity
Machine rotating acts on；Motor positive and negative terminal concatenate KM1 and KM2 normally-closed contact, can when rotating control loop disconnects short circuit
Motor positive and negative terminal makes stator winding form closed circuit, and the rotor rotated according to inertia generates sensing electric current in the stator windings,
This sensing electric current generates the direction damping magnetic field opposite with rotor rotation direction inside motor so that rotor is quickly made
It is dynamic.Set is filled with electric current off-limit alarm device body YXS, the direct induction machine circuit of alarm YXS bodies on motor negative terminal line
Interior curent change.The current value that the curent change of this motor main circuit has been set with alarm YXS internal controllers is compared
It is right, protection domain has been set when signal code value increases to, then has opened the normally-closed contact (3,4 contact) of alarm YXS itself, with
The normally-closed contact series connection contactor KM3 coil losing electricity, access DC MOTOR CONTROL major loop in contactor KM3 it is normally opened
Main contact is opened, and DC MOTOR CONTROL major loop power-off, motor stopping reaches protection purpose.
Scope of protection of the utility model is adjustable, and adjustable extent is wide, can reach 10mA-15A.(according to different transmitter models
It is adjustable, duplicate below)
The utility model cut-off loop is swift in response, and the response time can<250ms.
Its action error precision of the utility model is low, boundary value 2% set by relay output ＜；Transistor and optocoupler output
Boundary value 0.5% set by ＜.
The utility model has alarm signal directly perceived to export, and can be fed directly to the comprehensive guarantor of this cabinet or backstage, realizes warning function.
The utility model can runback, it is non-maintaining, be the electricity disclosed in CN103633891A with application for a patent for invention publication No.
Road is compared without resistance is needed to change, and has saved later maintenance cost.
The basic principle of the utility model and main feature and the advantages of the utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Simply illustrate the principle of the utility model, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
Various changes and modifications are had, these various changes and improvements fall within the scope of the claimed invention, the utility model
Claimed scope is defined by the appending claims and its equivalent thereof.
Claims (4)
1. a kind of three-station motor overload protection device, it is characterised in that：The three-station motor overload protection dress
Put including：(1) it is connected to the direct current generator primary work loop that direct current generator is driven to rotate between power positive cathode；(2) it is connected to electricity
The positive and negative interpolar in source is used for controlling the rotating forward control loop of direct current generator forward and reverse and reversion control loop；(3) it is connected to electricity
The positive and negative interpolar in source provides working power to DC current off-limit alarm device and DC current off-limit alarm device protection act exports back
Road.
2. three-station motor overload protection device according to claim 1, it is characterised in that：The DC current is got over
Limit alarm directly gathers the curent change of motor main circuit, and setting electric current value is compared with alarm, when signal code value
It increases to and has set protection domain, then open the normally-closed contact of alarm itself, the line with the contactor that the normally-closed contact is connected
Dead electricity is enclosed, the normally opened main contact of the contactor accessed in DC MOTOR CONTROL major loop is opened, and DC MOTOR CONTROL major loop breaks
Electricity, motor stopping.
3. three-station motor overload protection device according to claim 1, it is characterised in that：Rotate and reverse control
Circuit is connected to control switch SB1, the control switch SB2 of a division earthing switch of a division disconnecting switch, just
Turn control contactor KM1, reversion control contactor KM2.
4. three-station motor overload protection device according to claim 1, it is characterised in that：Electric current off-limit alarm device
Protection act output loop is directly connected to overload protection control contactor KM3 by electric current off-limit alarm device action output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720945502.0U CN207381961U (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720945502.0U CN207381961U (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207381961U true CN207381961U (en) | 2018-05-18 |
Family
ID=62341661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720945502.0U Expired - Fee Related CN207381961U (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207381961U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394752A (en) * | 2017-07-31 | 2017-11-24 | 上海纳杰电气成套有限公司 | A kind of three-station motor overload protection device |
-
2017
- 2017-07-31 CN CN201720945502.0U patent/CN207381961U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394752A (en) * | 2017-07-31 | 2017-11-24 | 上海纳杰电气成套有限公司 | A kind of three-station motor overload protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yao Diqing Inventor after: Jiang Bin Inventor after: Sun Jianfeng Inventor before: Chen Huan Inventor before: Jiang Bin Inventor before: Sun Jianfeng |
|
| CB03 | Change of inventor or designer information | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180518 |