CN208352965U - A kind of protection circuit of variable-frequency motor - Google Patents
A kind of protection circuit of variable-frequency motor Download PDFInfo
- Publication number
- CN208352965U CN208352965U CN201820992043.6U CN201820992043U CN208352965U CN 208352965 U CN208352965 U CN 208352965U CN 201820992043 U CN201820992043 U CN 201820992043U CN 208352965 U CN208352965 U CN 208352965U
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- CN
- China
- Prior art keywords
- variable
- frequency motor
- relay
- circuit
- fan trouble
- 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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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The utility model relates to a kind of protection circuit of variable-frequency motor, including variable-frequency motor start-stop circuit, variable-frequency motor start-stop circuit is equipped with the coil for controlling the intermediate relay of variable-frequency motor；It further include fan trouble control loop, fan trouble control loop is equipped with the normally opened contact of electrothermal relay and the coil of fan trouble relay；It also goes here and there equipped with the normally-closed contact for controlling the fan trouble relay of variable-frequency motor start-stop circuit on-off in variable-frequency motor start-stop circuit；I.e. the utility model is on the basis of original variable-frequency motor and cooling fan are with rising with the control model stopped, the fan trouble control loop of converting operation can be disconnected automatically by increasing in fan trouble, it changes in the case where fan trouble, because the operation of variable-frequency motor can not be cut off, motor is caused to operate always, the accident for causing motor to burn out.
Description
Technical field
The utility model belongs to variable-frequency motor protection field, and in particular to a kind of protection circuit of variable-frequency motor.
Background technique
In recent years, variable-frequency motor is widely applied in the factory.But variable-frequency motor is in operation because of higher hamonic wave
The reason of cause the loss of electric machine to increase, or when environmental factor, motor low-speed running cooling effect decline due to accumulate excessive heat
Amount etc. leads to heating in winding, so as to cause the winding insulation aging of motor inside, the lost of life or burns out.This accident is for changing
For the motor device that the industries such as work, steel, power generation cannot have a power failure, it will cause great economic loss to factories and miness.
And in the prior art, it is in most cases that variable-frequency motor and cooling fan link together, works as variable-frequency motor
When operation, cooling fan is also and then run, for radiating for variable-frequency motor, that is to say, that variable-frequency motor and cooling fan
Operation be a kind of with rising with the control model stopped, then, will exist in the case where fan trouble, because change can not be cut off
The converting operation of frequency motor, causes motor to operate always, and then the accident for causing motor to burn out, and reduces the service life of motor.
Utility model content
The purpose of this utility model is to provide a kind of protection circuits of variable-frequency motor, to solve the feelings when fan trouble
Under condition, because the converting operation of variable-frequency motor can not be cut off, the problem of causing motor to operate always, and then motor caused to burn out.
The utility model provides a kind of protection circuit of variable-frequency motor, including following scheme:
Circuit arrangement one, including variable-frequency motor start-stop circuit are protected, variable-frequency motor start-stop circuit is equipped with for controlling
The coil of the intermediate relay of variable-frequency motor；It further include fan trouble control loop, the fan trouble control loop is equipped with heat
The normally opened contact of relay and the coil of fan trouble relay；Variable-frequency motor start-stop circuit also goes here and there to be equipped with to be become for controlling
The normally-closed contact of the fan trouble relay of frequency motor start-stop circuit on-off.
Circuit arrangement two is protected, further includes that cooling blower shuts down circuit on the basis of protecting circuit arrangement one, it is described cold
But fan parking circuit is equipped with the normally-closed contact of electrothermal relay and the coil of air-blower control contactor.
Circuit arrangement three is protected, on the basis of protecting circuit arrangement two, it is cooling wind that the cooling blower, which shuts down circuit,
Circuit is shut down in machine delay, and cooling blower delay shuts down circuit and also go here and there the delayed contact for being equipped with the time relay；The time
The coil of the time relay of the delayed contact of relay is arranged in cooling blower control loop, and the cooling blower controls back
The normally opened contact equipped with intermediate relay is also gone here and there on road.
The utility model has the following beneficial effects: this programme is in original variable-frequency motor and cooling fan with the same control stopped
On the basis of mode, the fan trouble control loop of converting operation can be disconnected automatically by increasing in fan trouble, realized
The interlocked control of variable-frequency motor and cooling fan changes in the case where fan trouble, because that can not cut off converting operation, causes
The problem of motor operates always, and motor is caused to burn out.
Meanwhile the utility model can also be adjusted the fan operation time by the time relay of setting, control
The heat dissipation time after motor stopping；This control mode, the more conducively heat after motor stopping distribute completely until motor is complete
It is cooling.This effective radiating mode, extends the service life of motor, ensure that the normal operation of equipment, and reducing need not
The economic loss wanted.
Detailed description of the invention
Fig. 1 is the variable-frequency motor and cooling fan system schematic of the utility model；
Fig. 2 is the variable-frequency motor and cooling fan secondary control schematic illustration of the utility model.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the utility model is described in further detail.
Fig. 1 is the variable-frequency motor and cooling fan distribution system schematic diagram of the utility model；As seen from the figure, which includes
The 380V system power grid of L1, L2, L3, N, the switch with knifeshaped fuse Q1 being connect with power grid, frequency converter VVF, variable-frequency motor, in frequency converter
Fan power circuit breaker Q 2, air-blower control contactor KM, fan operation protection are also connected in parallel between VVF and switch with knifeshaped fuse Q1
Electrothermal relay FR, blower.
Fig. 2 is the variable-frequency motor and cooling fan secondary control schematic illustration of the utility model, wherein L1, N access control
Circuit AC power source processed, FU1 are control loop protection fuse, further include the variable-frequency motor start-stop circuit being arranged in parallel, wind
Circuit and cooling blower control loop are shut down in machine Fault Control circuit, cooling blower delay.
Wherein, the normally closed touching of coil and fan trouble relay K2 of the variable-frequency motor start-stop circuit equipped with intermediate relay K1
Point；The coil of normally opened contact and fan trouble relay K2 of the fan trouble control loop equipped with electrothermal relay FR；Cooling blower
The coil of normally opened contact and time relay KT of the control loop equipped with intermediate relay K1；Cooling blower delay is shut down circuit and is set
There are the delayed contact of the normally-closed contact of electrothermal relay FR, the coil of air-blower control contactor KM, time relay KT.
Wherein, also string is equipped with variable-frequency motor starting button SB1, variable-frequency motor stop button in variable-frequency motor start-stop circuit
SB2.And the both ends variable-frequency motor starting button SB1 are also parallel with and start self-locking branch, start self-locking branch equipped with intermediate relay
The normally opened contact of K1.
Specifically, the normally opened contact for starting the intermediate relay K1 in self-locking branch closes after SB1 button presses connection
It closes, the normally-closed contact of fan trouble relay K2 is in closed state, and the coil of intermediate relay K1 obtains electric actuation, variable-frequency motor
Starting operation.Meanwhile the normally opened contact closure of the intermediate relay K1 in cooling blower control loop, cooling blower control loop
Conducting, the coil of time relay KT obtain electric actuation, and the delayed contact of time relay KT is closed, air-blower control contactor KM's
The synchronous electrification of coil, blower start to work simultaneously, and variable-frequency motor is made to be always maintained at good heat radiating state in operation.
When pressing SB2 stop button, intermediate relay K1, the coil of time relay KT while power loss, variable-frequency motor
Out of service, the delayed contact of time relay KT is delayed regular hour opening after itself coil blackout, and blower setting
Delay time in continue to run, give variable-frequency motor heat dissipation, ensure that variable-frequency motor operation a period of time in stop after can also
Enough heat dissipations.
When blower breaks down in variable-frequency motor operation, the normal of the electrothermal relay FR in circuit is shut down in cooling blower delay
Closed contact disconnects, and the coil losing electricity of air-blower control contactor KM, blower shuts down, at this point, in fan trouble control loop
The normally opened contact of electrothermal relay FR is closed, and the coil of fan trouble relay K2 obtains electric blower in variable-frequency motor start-stop circuit
The normally-closed contact of power transfer relay K2 is opened, and leads to the coil losing electricity of intermediate relay K1, variable-frequency motor is out of service.
As other embodiments, the confession in variable-frequency motor start-stop circuit, fan trouble control loop in the utility model
Power supply can also be the power supply being provided separately, as long as guaranteeing there is interlocked control between two circuits.
The control program of the circulation interlocking of variable-frequency motor and cooling fan in the utility model, it is ensured that when motor operation
In good radiating state；And in the case where fan trouble, variable-frequency motor start-stop circuit is disconnected, motor has been played
The protective effect of effect.Meanwhile the fan operation time is adjusted by the time relay of setting, after controlling motor stopping
It radiates the time, the heat after more conducively shutting down to variable-frequency motor distributes completely until motor is completely cooling.This effective heat dissipation
Mode extends the service life of motor, ensure that the normal operation of equipment, reduces unnecessary economic loss.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that specific embodiment of the present utility model is only limitted to this, for the utility model person of an ordinary skill in the technical field
For, under the premise of refusing to obey from the utility model design, several simple deduction or replace can also be made, all should be considered as
Belong to the utility model and determines scope of patent protection by the claims submitted.
Claims (3)
1. a kind of protection circuit of variable-frequency motor, including variable-frequency motor start-stop circuit, variable-frequency motor start-stop circuit, which is equipped with, to be used
In the coil of the intermediate relay of control variable-frequency motor；It is characterized in that, further include fan trouble control loop, the blower event
Hinder control loop and is equipped with the normally opened contact of electrothermal relay and the coil of fan trouble relay；Variable-frequency motor start-stop circuit is also
String is equipped with the normally-closed contact for controlling the fan trouble relay of variable-frequency motor start-stop circuit on-off.
2. a kind of protection circuit of variable-frequency motor according to claim 1, which is characterized in that further include that cooling blower is shut down
Circuit, the cooling blower shut down circuit and are equipped with the normally-closed contact of electrothermal relay and the coil of air-blower control contactor.
3. a kind of protection circuit of variable-frequency motor according to claim 2, which is characterized in that the cooling blower is shut down back
Road is that circuit is shut down in cooling blower delay, and cooling blower delay shuts down circuit and also go here and there the delay touching equipped with the time relay
Point；The coil of the time relay of the delayed contact of the time relay is arranged in cooling blower control loop, described cold
But the normally opened contact equipped with intermediate relay is also gone here and there in air-blower control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820992043.6U CN208352965U (en) | 2018-06-26 | 2018-06-26 | A kind of protection circuit of variable-frequency motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820992043.6U CN208352965U (en) | 2018-06-26 | 2018-06-26 | A kind of protection circuit of variable-frequency motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208352965U true CN208352965U (en) | 2019-01-08 |
Family
ID=64881032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820992043.6U Expired - Fee Related CN208352965U (en) | 2018-06-26 | 2018-06-26 | A kind of protection circuit of variable-frequency motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208352965U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159025A (en) * | 2022-07-18 | 2022-10-11 | 天地(榆林)开采工程技术有限公司 | Control method and device of belt conveyor and belt conveyor |
-
2018
- 2018-06-26 CN CN201820992043.6U patent/CN208352965U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159025A (en) * | 2022-07-18 | 2022-10-11 | 天地(榆林)开采工程技术有限公司 | Control method and device of belt conveyor and belt conveyor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191202 Address after: 100144, No. 1 West well road, Beijing, Shijingshan District Patentee after: Beijing Dongbi Electric Co., Ltd. Address before: Changge City, Xuchang City, Henan province 461500 Weiwu Road, South West Patentee before: Henan Senyuan Electric Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190108 Termination date: 20210626 |