CN208890362U - Electric motor protective device and air-conditioning - Google Patents
Electric motor protective device and air-conditioning Download PDFInfo
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- CN208890362U CN208890362U CN201821512720.6U CN201821512720U CN208890362U CN 208890362 U CN208890362 U CN 208890362U CN 201821512720 U CN201821512720 U CN 201821512720U CN 208890362 U CN208890362 U CN 208890362U
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Abstract
This application involves a kind of electric motor protective device and air-conditionings.Electric motor protective device includes load, load control switch, controller and detects the electric current of power supply line and send the current detection circuit of value of feedback to controller, wherein power supply line is the route that power end is connected to machine winding；Current detection circuit connects controller, and load is serially connected in power supply line, and load control switch is connected in parallel on load both ends, and connects controller；Controller is for obtaining security parameter values corresponding with the resistance value of machine winding and extreme parameter values, when value of feedback is less than security parameter values, control load control switch closure；When value of feedback is greater than or equal to security parameter values and is less than extreme parameter values, control load control switch is disconnected；Wherein, security parameter values are less than extreme parameter values.Using the application, the reliability of motor work can be improved while ensuring safety.
Description
Technical field
This application involves technical field of electrical equipment, more particularly to a kind of electric motor protective device and air-conditioning.
Background technique
The safety of motor operation is influenced by the operating current of machine winding, if the use environment of motor is relatively severe, electric current
It is higher or when thunder and lightning weather occur and having instant high-voltage, it is easy to appear overcurrent, influences the safety of motor operation.For example, if
The electric current of the machine winding of air-conditioning is excessive, then may cause that motor is burnt, air-conditioning can not work.
The measure of traditional protection motor safe operation, usually in the steady state value that the electric current of machine winding is more than setting
When, the electric current of control cutting machine winding avoids motor from burning.Although this mode may insure motor safety, but can frequency
It is numerous to lead to motor stopping, influence the reliability of motor work.
Utility model content
Based on this, it is necessary to for the low problem of motor functional reliability, provide a kind of in the same of guarantee motor safety
When, improve motor functional reliability electric motor protective device and air-conditioning.
A kind of electric motor protective device, the electric current including load, load control switch, controller and detection power supply line are concurrent
Send value of feedback to the current detection circuit of the controller, wherein the power supply line is that power end is connected to machine winding
Route；The current detection circuit connects the controller, and the load is serially connected in the power supply line, the load control
Switch in parallel connects the controller at the load both ends；
The controller is used to obtain security parameter values corresponding with the resistance value of the machine winding and extreme parameter values,
When the value of feedback is less than the security parameter values, the load control switch closure is controlled；It is greater than or waits in the value of feedback
In the security parameter values and when being less than the extreme parameter values, controls the load control switch and disconnect；Wherein, the safety
Parameter value is less than the extreme parameter values.
A kind of air-conditioning, including above-mentioned electric motor protective device, unit and the motor for being provided with the machine winding, the motor
Connect the electric motor protective device and the unit.
In above-mentioned electric motor protective device, by will load be serially connected in power supply line, load both ends be connected in parallel control
The load control switch of device detects the electric current of the power supply line of machine winding using current detection circuit and sends value of feedback to control
Device processed；Controller control load control switch closure when value of feedback is less than security parameter values does not influence so that load is shorted
The normal work of motor；Controller is when value of feedback is greater than or equal to security parameter values and is less than extreme parameter values, control load
Control switch disconnects, then machine winding and load in series, can increase total resistance value in power supply line, reduce electric current, to drop
The calorific value of low machine winding, avoids motor from burning.In this way, can be according to current detecting as a result, reducing machine winding in time
Electric current, reduce calorific value, do not need directly by machine winding power-off cause frequent shutdown, can while ensuring safety,
Improve the reliability of motor work.
Detailed description of the invention
Fig. 1 is the partial structure diagram of electric motor protective device in an embodiment；
Fig. 2 is the circuit diagram of electric motor protective device in an embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, a kind of electric motor protective device, including load 120, load control switch 130, control are provided
Device 140 processed and current detection circuit (not shown).Wherein, power supply line is the route that power end is connected to machine winding.Electric current
Detection circuit connects controller 140；Load 120 is serially connected in power supply line, and load control switch 130 is connected in parallel on 120 liang of load
End, and connect controller 140.Wherein, power supply line is the route for connecting machine winding 200 with power end, i.e., power supply terminates
The electric current entered passes through power line transmission to machine winding 200.Machine winding 200 is the winding being set on motor.Load 120
It is serially connected in power supply line, specifically, load 120 is connected between power end and machine winding 200.
Wherein, the electric current of current detection circuit detection power supply line, can be certain between detection power end and load 120
The electric current of a field location is also possible to the electric current of some field location between detection load 120 and machine winding 200.Specifically,
Value of feedback is the value for increasing with electric current and increasing, and can be the numerical value equal to electric current.
Controller 140 is for obtaining security parameter values corresponding with the resistance value of machine winding 200 and extreme parameter values, anti-
When feedback value is less than security parameter values, control load control switch 130 is closed；It is greater than or equal to security parameter values and small in value of feedback
When extreme parameter values, control load control switch 130 is disconnected；Wherein, security parameter values are less than extreme parameter values.
Wherein, the resistance value of machine winding 200, which can be, is pre-stored within controller 140, is also possible to by receiving user
The resistance value of input obtains, and can also be that receiving the resistance value that other equipment are sent obtains.Security parameter values and extreme parameter values and resistance
It is worth related.Specifically, controller 140 can obtain security parameter values and extreme parameter values by using well known technology.For example,
Controller 140 can be the corresponding table for being previously stored with each resistance value with security parameter values, extreme parameter values, get motor around
After the resistance value of group 200, searching corresponding table can be obtained corresponding security parameter values and extreme parameter values.
Value of feedback and power supply line it is current related.If value of feedback is less than security parameter values, then it represents that flow to machine winding
200 electric current in safe range, is closed, due to load control switch at this point, controller 140 controls load control switch 130
130 are connected in parallel on 120 both ends of load, then load 120 and be shorted, motor operates normally.If value of feedback is greater than or equal to security parameter
It is worth and is less than extreme parameter values, then it represents that the electric current for flowing to machine winding 200 is exceeding safe range, at this point, controller 140 is controlled
Load control switch 130 processed disconnects, then machine winding 200 is connected with loading 120, can increase total resistance value in power supply line,
Reduce electric current and avoids motor from burning to reduce the calorific value of machine winding 200.
Specifically, controller 140 can be by using well known technology by value of feedback and security parameter values and absolute rating
Value is compared.For example, controller 140 may include comparator, first input terminal input feedback value of comparator is corresponding
Electric signal, the corresponding electric signal of second input terminal input security parameter values of comparator, the output end of comparator are based on comparing
As a result it exports low level signal or high level signal to load control switch 130, low level signal and high level signal is used respectively
It disconnects and is closed in control load control switch 130.
In above-mentioned electric motor protective device, it is serially connected in power supply line, by the way that 120 will be loaded in 120 both ends parallel connections of load company
The load control switch 130 for connecing controller 140, using the electric current of the power supply line of current detection circuit detection machine winding 200
And value of feedback is sent to controller 140；Controller 140 controls load control switch 130 when value of feedback is less than security parameter values
Closure does not influence the normal work of motor so that load 120 is shorted；Controller 140 is greater than or equal to safety ginseng in value of feedback
Numerical value and when being less than extreme parameter values, control load control switch 130 disconnects, then machine winding 200 120 is connected with loading, can
Motor is avoided to burn to reduce the calorific value of machine winding 200 to increase total resistance value in power supply line, reduce electric current.Such as
This, can be according to current detecting as a result, the timely electric current for reducing machine winding 200, reduction calorific value, do not need motor directly
The power-off of winding 200 causes frequent shutdown, can improve the reliability of motor work while ensuring safety.
Above-mentioned electric motor protective device can be applied to direct current generator, also can be applied to alternating current generator.In Fig. 1 between device
Connecting line, be the line for indicating that there is connection relationship, be not used to limit route quantity.For example, if power end is alternating current
Power access end, then power end and load 120 between, load 120 and machine winding 200 between, at least three can be passed through
Connection.
In one embodiment, with reference to Fig. 2, current detection circuit includes that motor driving plate 111 and current transformer (are schemed not
Show), motor driving plate 111 connects power end, and motor driving plate 111 passes through 120 connection machine winding 200 of load, that is, motor
120 one end of the connection load of driving plate 111,120 other ends of load connect machine winding 200.Motor driving plate 111 is connected to motor
Winding 200 is routed through current transformer, and current transformer connects motor driving plate 111.Wherein, power end is connecing in figure
Line terminals XT.
Specifically, current transformer can be setting between motor driving plate 111 and load 120, that is, motor driving plate
Current transformer is routed through between 111 and load 120.Current transformer be also possible to setting load 120 and motor around
Between group 200；That is, being routed through current transformer between load 120 and machine winding 200.
External power supply supplies electricity to motor driving plate 111 through power end, and machine winding 200 takes electricity from motor driving plate 111；Electricity
The faradic size of current transformer is simultaneously sent to motor driving plate 111, and motor driving plate 111 incudes according to current transformer
Electric current obtains value of feedback.By using the electric current of the output of current transformer Induction Motor Drive plate 111 to machine winding 200, adopt
The motor driving plate 111 to be worked with driving motor obtains value of feedback according to electric current and is sent to controller 140, and structure is simply real
With.
In one embodiment, motor driving plate 111 is sequentially connected load 120 and machine winding by a plurality of route respectively
200, the quantity of current transformer is quantity that is multiple and being less than or equal to route, and a current transformer is corresponding by a route
It passes through.That is, a current transformer is used to incude the size of current of a route.
Accordingly, the average value for the electric current that motor driving plate 111 can detect multiple current transformers is as supply lines
The electric current on road.For the motor of external alternating current, the route connected between device has a plurality of.By taking triple line as an example, power end is defeated
Three-phase voltage out is transferred to machine winding 200 by triple line again by motor driving plate 111.The real electrical machinery course of work
In, the electric current of route is simultaneously unstable, carries out current detecting to a plurality of route respectively by using multiple current transformers, is convenient for root
The electric current of power supply line is obtained according to the average value of the electric current of a plurality of route, accuracy is higher.
Further, the quantity of current transformer is two.The electric current on two lines road is detected using two current transformers,
The electric current for the power supply line that may insure is more accurate, and cost is not too high.
It is appreciated that in other embodiments, it can also be using the device except motor driving plate 111 according to Current Mutual Inductance
The electric current of device induction obtains value of feedback and is sent to controller 140.For example, load 120 connects power end by motor driving plate,
The work of motor driving plate driving motor；Current detection circuit also may include processing chip and current transformer, 120 connection of load
To the current transformer that is routed through of machine winding 200, current transformer connection processing chip, processing chip connects controller
140。
In one embodiment, load 120 includes thermistor, and thermistor is serially connected in power supply line.
Thermistor shows different resistance values at different temperature.Thermistor is serially connected in power supply line, when
When controller 140 controls the closure of load control switch 130, it is shorted thermistor, motor operates normally；When controller 140 controls
When load control switch 130 disconnects, machine winding 200 is connected with thermistor, increases electricity by the temperature characterisitic of thermistor
The resistance value in 200 place circuit of machine winding avoids motor from burning to reduce the calorific value of machine winding 200, and protecting effect is more
It is good.
Further, thermistor is posive temperature coefficient thermistor, and when temperature is higher, resistance value is higher, so as to electricity
The calorific value of machine winding 200 increases and improves resistance value, and enhancing reduces the effect of electric current.
Specifically, the quantity Yu motor driving plate 111 of thermistor is sequentially connected the line of load 120 and machine winding 200
The quantity on road is identical.For example, the three-phase voltage of power end output passes through three by motor driving plate 111 again by taking triple line as an example
Phase line is transferred to machine winding 200, and accordingly, the quantity of thermistor is three, concatenates a temperature-sensitive respectively on every route
Resistance, as shown in Figure 2.
In one embodiment, load control switch 130 is relay, and the coil of relay connects controller 140, relay
The switch (KA in Fig. 2) of device is connected in parallel on 120 both ends of load.
By controller 140 control relay coil energization or power-off, come control relay switch closure or
It disconnects, so that load 120 be made to be shorted or connect with machine winding 200, manipulates simple and convenient.It is appreciated that in other embodiments
In, load control switch 130 can also be other kinds of electric-controlled switch, for example, it may be triode, field-effect tube etc..
In one embodiment, above-mentioned electric motor protective device further includes power-cutting off control switch, and power-cutting off control switch is serially connected in
In power supply line, and connect controller 140.Controller 140 is when value of feedback is less than or equal to extreme parameter values, control power-off control
System closes the switch, and when value of feedback is greater than or equal to extreme parameter values, control power-cutting off control switch is disconnected.
It is serially connected in control power supply line by using power-cutting off control switch, controller 140 controls power-cutting off control switch and closes
It closes, then power supply line's conducting, the work of 200 normal power-up of machine winding；Controller 140 controls power-cutting off control switch and disconnects, then supplies
Electric line disconnects, machine winding 200 powers off.It is protected in this way, shutdown can be triggered when value of feedback meets or exceeds extreme parameter values
Shield measure is powered off to machine winding 200, is further ensured that the safety of motor work.
In one embodiment, power-cutting off control switch is contactor, and the coil of contactor connects controller 140, contactor
Switch (KM in Fig. 2) be serially connected in power supply line.
By the energization or power-off of the coil of 140 control contactor of controller, come the switch of control contactor closure or
It disconnects, so that machine winding 200 be made to be powered or power off, manipulates simple and convenient.It is appreciated that in other embodiments, power-off control
System switch can also be other kinds of electric-controlled switch, for example, it may be triode, field-effect tube etc..
In one embodiment, it provides a kind of air-conditioning, including electric motor protective device above-mentioned, unit and is provided with motor
The motor of winding, motor connect electric motor protective device and unit.
Wherein, unit includes compressor, evaporator, condenser, heat exchanger.Specifically, controller 140 can be air-conditioning
Master control borad, a single-chip microcontroller being also possible to except the master control borad of air-conditioning.
Above-mentioned air-conditioning can similarly be mentioned due to using electric motor protective device above-mentioned while ensuring safety
The reliability of high motor work, to improve the reliability of air-conditioning work.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of this application, various modifications and improvements can be made, these belong to the application's
Protection scope.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (8)
1. a kind of electric motor protective device, which is characterized in that including load, load control switch, controller and detection power supply line
Electric current and send the current detection circuit of value of feedback to the controller, wherein the power supply line is connected to for power end
The route of machine winding；The current detection circuit connects the controller, and the load is serially connected in the power supply line, institute
It states load control switch and is connected in parallel on the load both ends, and connect the controller；
The controller is for obtaining security parameter values corresponding with the resistance value of the machine winding and extreme parameter values, described
When value of feedback is less than the security parameter values, the load control switch closure is controlled；It is greater than or equal to institute in the value of feedback
When stating security parameter values and being less than the extreme parameter values, controls the load control switch and disconnect；Wherein, the security parameter
Value is less than the extreme parameter values.
2. electric motor protective device according to claim 1, which is characterized in that the current detection circuit includes motor driven
Plate and current transformer, the motor driving plate connects the power end, and connects the machine winding, institute by the load
The current transformer that is routed through that motor driving plate is connected to the machine winding is stated, described in the current transformer connection
Motor driving plate.
3. electric motor protective device according to claim 2, which is characterized in that the motor driving plate passes through a plurality of route point
It is not sequentially connected the load and the machine winding, the quantity of the current transformer is multiple and is less than or equal to the line
The quantity on road, a current transformer correspondence are routed through by one.
4. electric motor protective device according to claim 1, which is characterized in that the load includes thermistor, the heat
Quick resistance is serially connected in the power supply line.
5. electric motor protective device according to claim 1, which is characterized in that the load control switch is relay, institute
The coil for stating relay connects the controller, and the switch in parallel of the relay is at the load both ends.
6. electric motor protective device described in -5 any one according to claim 1, which is characterized in that further include that power-off control is opened
It closes, the power-cutting off control switch is serially connected in the power supply line, and connects the controller；
The controller controls the power-cutting off control switch and closes when the value of feedback is less than or equal to the extreme parameter values
It closes, when the value of feedback is greater than or equal to the extreme parameter values, controls the power-cutting off control switch and disconnect.
7. electric motor protective device according to claim 6, which is characterized in that the power-cutting off control switch is contactor, institute
The coil for stating contactor connects the controller, and the switch of the contactor is serially connected in the power supply line.
8. a kind of air-conditioning, which is characterized in that including electric motor protective device, unit described in claim 1-7 any one and set
It is equipped with the motor of the machine winding, the motor connects the electric motor protective device and the unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821512720.6U CN208890362U (en) | 2018-09-14 | 2018-09-14 | Electric motor protective device and air-conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821512720.6U CN208890362U (en) | 2018-09-14 | 2018-09-14 | Electric motor protective device and air-conditioning |
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| Publication Number | Publication Date |
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| CN208890362U true CN208890362U (en) | 2019-05-21 |
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| CN201821512720.6U Active CN208890362U (en) | 2018-09-14 | 2018-09-14 | Electric motor protective device and air-conditioning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
-
2018
- 2018-09-14 CN CN201821512720.6U patent/CN208890362U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
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