CN108780012A - AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator - Google Patents
AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator Download PDFInfo
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- CN108780012A CN108780012A CN201880000903.6A CN201880000903A CN108780012A CN 108780012 A CN108780012 A CN 108780012A CN 201880000903 A CN201880000903 A CN 201880000903A CN 108780012 A CN108780012 A CN 108780012A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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Abstract
The embodiment of the present application provides AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator.The detection circuit includes：AC/DC isolating circuit, resistance detecting circuit and processor；The AC/DC isolating circuit is made of at least one inductance, has input terminal and output end for separating the alternating current between the input terminal and the output end and DC current being allowed to pass through；The test side of the resistance detecting circuit is connect with the output end of the AC/DC isolating circuit, the voltage signal changed for generating the resistance value for following the AC Electrical Machine Winding, and the voltage signal is exported from the signal output end of the resistance detecting circuit；The processor is connect with the signal output end of the resistance detecting circuit, for receiving the voltage signal and calculating the temperature change of current AC Electrical Machine Winding according to the voltage signal.It may be implemented to rise test to the real-time online temperature of alternating current generator, comprehensively, really reflect the real time execution situation of alternating current generator.
Description
Technical field
This application involves detection device technical fields, more particularly to a kind of AC Electrical Machine Winding temperature sensing circuit, temperature
Spend detector and alternating current generator.
Background technology
There is close contact between operating temperature in service life, stability of motor etc..According to the regulation of national standard,
The machine winding of different insulative grade has different permission Wen Sheng, if the Wen Sheng of machine winding has been more than specified value, can influence electricity
The service life of machine can burn out motor when serious.
Therefore, it is necessary to accurately measure Rated motor operation when machine winding temperature to check motor performance whether
It is qualified.The existing traditional test methods for winding in motor generally include two kinds of thermometer method of testing and thermocouple assay method.
Wherein, thermometer method of testing refers to using various types of thermometer, and direct measurement motor is in different location
Dimension.Thermocouple assay rule is by using electric thermo-couple temperature tester, selective testing of electric motors surface or winding paint
The temperature variations of the certain sample points in envelope curve surface.
During realizing the application, it is found by the applicant that following problem exists in the prior art：Temperature in use measurement examination
When method, coil windings temperature that cannot in real time inside measurement motor is effected by environmental factors, differ greatly between each other and
It is inaccurate.
And determining that the thermocouple assay method required response time is more complicated, different experimental conditions has different surveys
Amount result (because it is influenced by the heat transfer rate of thermocouple and surrounding medium, heat transfer rate is high, then thermal response time is with regard to short).In addition,
Many machine windings have metal shell, are also inconvenient to sunken cord and be tested.
Invention content
The embodiment of the present application mainly solving the technical problems that：Existing method for testing temperature rise can not meet use well
It needs.
In order to solve the above technical problems, the embodiment of the present application provides a kind of AC Electrical Machine Winding temperature sensing circuit.It is described
AC Electrical Machine Winding temperature sensing circuit includes：AC/DC isolating circuit, resistance detecting circuit and processor；
The AC/DC isolating circuit is made of at least one inductance, has input terminal and output end；The alternating current-direct current every
From circuit for separating the alternating current between the input terminal and the output end and DC current being allowed to pass through；
The test side of the resistance detecting circuit is connect with the output end of the AC/DC isolating circuit, is followed for generating
The resistance value of the AC Electrical Machine Winding and the voltage signal changed, signal of the voltage signal from the resistance detecting circuit
Output end exports；
The processor is connect with the signal output end of the resistance detecting circuit, for receiving the voltage signal and root
The temperature change of current AC Electrical Machine Winding is calculated according to the voltage signal.
Optionally, the AC/DC isolating circuit includes：First inductance, the second inductance and the first capacitance；Described second
One end of inductance is that one of the input terminal connection terminal, the other end are connect with one end of first capacitance；It is described
The other end of first capacitance is another connection terminal of the input terminal；One end of first inductance is the output end
One of connection terminal, the other end are connect with the anode of first capacitance；The other end of first capacitance is described defeated
Another connection terminal of outlet.
Optionally, the AC/DC isolating circuit further includes load resistance；One end of the load resistance and described first
One end of capacitance connects, and the other end of the load resistance is connect with the other end of first capacitance.
Optionally, the resistance detecting circuit includes：Bridge-type detection unit, amplifying unit and filter unit；The bridge
Formula detection unit is connect by the test side of the resistance detecting circuit with the output end of the AC/DC isolating circuit, according to institute
It states the resistance change of AC Electrical Machine Winding and generates corresponding weak voltage signal in the voltage output end of bridge-type detection unit；Institute
The amplified signal input terminal for stating amplifying unit is connect with the voltage output end of the bridge-type detection unit, for amplifying the light current
Signal is pressed, the voltage signal is formed；The voltage signal is exported from the signal output end of the resistance detecting circuit；The filter
Wave unit is connect with the signal output end of the amplified signal input terminal of the amplifying unit and the resistance detecting circuit, for filtering
Except the interference signal generated in the weak voltage signal amplification process.
Optionally, the bridge-type detection unit includes：First resistor, second resistance, 3rd resistor and DC power supply；
One end of the first resistor is connect with a connection terminal of the output end, and one end of the first resistor is also
Form the first output pin；The other end of the first resistor is connect with one end of the second resistance, the first resistor it is another
One end is also connect with the DC power supply；The other end of the second resistance is connect with one end of the 3rd resistor, and described
The other end of two resistance also forms the second output pin；Another connecting pin of the other end of the 3rd resistor and the output end
Son is connected and is grounded；When the resistance value of the AC Electrical Machine Winding changes, from first output pin and described second
Output pin exports corresponding weak voltage signal.
Optionally, the amplifying unit includes：Operational amplifier, the second capacitance and the 8th resistance；The operation amplifier
The inverting input and normal phase input end of device are signal receiving end, for receiving the weak voltage signal；The operational amplifier
Inverting input connect with the output end of the operational amplifier by the second capacitance, the anti-phase input of the operational amplifier
End is also connect by the 8th resistance with the output end of the operational amplifier.
Optionally, the filter unit includes：7th resistance, the 9th resistance, third capacitance and the 4th capacitance；
Described 7th resistance one end is connect with the normal phase input end of the operational amplifier, other end ground connection；The third
One end of capacitance is connect with the normal phase input end of the operational amplifier, other end ground connection；
Described 9th resistance one end is connect with the output end of the operational amplifier, and it is defeated that the other end forms the detection signal
Outlet；The other end of 9th resistance also passes through the 4th capacity earth.
Optionally, the amplifying unit further includes the 4th resistance and the 5th resistance；
First output pin is connect by the 4th resistance with the inverting input of the operational amplifier；Described
Two output pins are connect by the 5th resistance with the normal phase input end of the operational amplifier.
Optionally, the processor is specifically used for：According to the voltage signal of reception, the AC Electrical Machine Winding is calculated
Resistance change situation；According to the resistance change situation, the temperature change of the AC Electrical Machine Winding is calculated.
Optionally, the processor calculates the temperature change of the AC Electrical Machine Winding by following formula：
Wherein, Δ t is the temperature change of the AC Electrical Machine Winding, and RCB2 is current time, AC/DC isolating circuit
The resistance value of output end, RCB1 are initial time, and the resistance value of the output end of AC/DC isolating circuit, t1 is initial room-temperature, t2
For current room temperature, k is winding coefficient.
In order to solve the above technical problems, another embodiment of the application provides a kind of temperature monitor.The temperature monitor packet
Include AC Electrical Machine Winding temperature sensing circuit, detection terminal and display device as described above；
The input terminal of the AC Electrical Machine Winding temperature sensing circuit extends to form detection terminal, and the detection terminal is used for
It is connect with the AC Electrical Machine Winding of alternating current generator；
The temperature that the processor of the AC Electrical Machine Winding temperature sensing circuit is used to calculate the AC Electrical Machine Winding becomes
Change；The display device is connected to the processor, the temperature change for showing the AC Electrical Machine Winding.
In order to solve the above technical problems, another embodiment of the application provides a kind of alternating current generator.The alternating current generator includes electricity
Machine winding, power switch and AC Electrical Machine Winding temperature sensing circuit as described above；
The input terminal of the AC Electrical Machine Winding temperature sensing circuit is connect with the AC Electrical Machine Winding, the alternating current
The processor of machine winding temperature detection circuit is connect with the power switch, the processor be used for according to the alternating current generator around
The temperature change of group, controls the operation of the alternating current generator.
Alternating current has been isolated by the way of inductance isolation in the AC Electrical Machine Winding temperature sensing circuit of the embodiment of the present application
The exchange forceful electric power of pusher side may be implemented to rise test to the real-time online temperature of alternating current generator, to comprehensively, really reflect alternating current
The real time execution situation of machine.It is the real time temperature data in alternating current generator operational process that the temperature finally obtained, which rises test result, is surveyed
It is high to measure accuracy.
Description of the drawings
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the machine winding schematic diagram of capacitor operating type monopole asynchronous motor；
Fig. 2 is the machine winding schematic diagram for the threephase asynchronous that stator winding is star-like connection；
Fig. 3 is the equivalent resistance schematic diagram of Fig. 1 and machine winding shown in Fig. 2；
Fig. 4 is the application environment schematic diagram of the AC Electrical Machine Winding temperature sensing circuit of the embodiment of the present application；
Fig. 5 is the structure diagram of the AC Electrical Machine Winding temperature sensing circuit of the embodiment of the present application；
Fig. 6 is the circuit diagram of the AC Electrical Machine Winding temperature sensing circuit of the embodiment of the present application；
Fig. 7 is the schematic equivalent circuit of the AC Electrical Machine Winding impedance of the embodiment of the present application.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
Alternating current generator in practical applications specifically has a variety of different types.In general, monophase machine can be divided into
With three phase electric machine two major classes.Fig. 1 and it is shown in Fig. 2 used to be usual, the machine winding of relatively common several alternating current generators is shown
It is intended to.
Wherein, Fig. 1 show capacitor operating type monopole asynchronous motor.Fig. 2 is the three-phase that stator winding is star-like connection
Asynchronous motor.According to Fig. 1 and shown in Fig. 2, it can be seen that the D.C. resistance at the both ends A, B of machine winding is DC current
From the ends A to the direct current winding of the passed through machine winding in the ends B, it can specifically be equivalent to a corresponding equivalent resistance.
In the present embodiment, an imaginary electricity equal with the DC resistance of machine winding is indicated with " equivalent resistance "
Resistance.Fig. 3 is schematic diagram of the equivalent resistance between side a and b.As shown in figure 3, in circuit diagram, machine winding
Equivalent resistance can be indicated by the resistance Rx being connected between side a and b.
The principle for being varied with temperature and being changed based on resistance, by measure the equivalent resistance of AC Electrical Machine Winding in room temperature and
Change in resistance when operation changes formula, you can indirectly calculate the temperature of AC Electrical Machine Winding according to corresponding resistance v. temperature
Variation.
In general, the change in resistance of the equivalent resistance can test acquisition by modes such as balanced bridges.But due to exchange
At work, the both ends of equivalent resistance can be applied with very strong alternating voltage to motor so that the mode of bridge test can not use.
Therefore, the resistance value measurement of equivalent resistance is had to carry out in the state of motor stopping.The non real-time test mode,
It can influence the accuracy of resistance measurement result and bring to use upper inconvenience.
In order to avoid a series of problems caused by above-mentioned measurement method, alternating current provided by the embodiments of the present application can be used
Machine winding temperature detection circuit measures the equivalent resistance of AC Electrical Machine Winding in the operating condition, realizes to AC Electrical Machine Winding
The real-time online of temperature change detects.
Fig. 4 is the application environment of AC Electrical Machine Winding temperature sensing circuit provided by the embodiments of the present application.As shown in figure 4,
Include in the application environment：AC power 10, electric equipment products 20, AC Electrical Machine Winding temperature sensing circuit 30, controller 40,
Communication module 50, high in the clouds platform 60, user terminal 70 and network 80.
AC power 10 can be specifically to meet the alternating voltage and frequency industrial-frequency alternating current of various criterion, charger production
Product access, for providing electric energy for electric equipment products 20.What the voltage and frequency of AC power 10 were actually needed with specific reference to product
Rated voltage and frequency range are determined.For example, 220V50HZ, 240V50HZ or 120V60HZ.
Electric equipment products 20 are any kind of household or the electrical equipment of work.It includes at least and uses in electric equipment products 20
In the alternating current generator 21 and motor-drive circuit 22 for controlling alternating current generator that provide power.The electric equipment products 20 may be used also
With with other suitable hardware device modules, to realize one or more kinds of different functions, such as casing, transmission gear shift
Case etc..
The alternating current generator 21 can be specifically the motor of any suitable type, such as such as Fig. 2 or exchange shown in Fig. 3
Motor.In the operational process of electric equipment products 20, the operating temperature of alternating current generator 21 is very important technical indicator.It is working
In the case that temperature is excessively high, the problems such as winding of alternating current generator 21 would tend to occur decreasing insulating, accelerated ageing.
The motor-drive circuit 22 is the switching device of the power supply state for switching alternating current generator, for example, button is opened
Pass, relay, silicon-controlled device (such as bidirectional thyristor).It can either user instruction cuts off or connects according to control signal
Energization source.
AC Electrical Machine Winding temperature sensing circuit 30 is that an equivalent resistance for carrying out AC Electrical Machine Winding measures
Low-voltage circuit.The AC Electrical Machine Winding temperature sensing circuit 30 is connect with the machine winding of alternating current generator 21, detects its resistance
The variation of value.In the present embodiment, the AC Electrical Machine Winding temperature sensing circuit 30 can be used as a function module, integrate
In the inside of electric equipment products 20, winding temperature detection function is provided for electric equipment products 20.
In further embodiments, the AC Electrical Machine Winding temperature sensing circuit 20 can also be produced independently of the electric appliance
Product 20 are arranged, and after corresponding shell and interactive device is arranged, are used as temperature monitor, for detecting multiple and different electric appliance
The winding temperature of product 20.
The controller 40 can be any kind of, chip or integrated circuit with certain logical operation capability.
The controller 40 can be as function module one of in the AC Electrical Machine Winding temperature sensing circuit 30, according to inspection
The resistance change measured calculates the temperature variations of motor.The controller 40 can also include at least one storage
Device is stored with corresponding calculation procedure, is called when needed by controller 40.
In some embodiments, the controller 40 can also be detached from AC Electrical Machine Winding temperature sensing circuit 30, by
The master board of electric equipment products executes identical function.At this point, the AC Electrical Machine Winding temperature sensing circuit 20 is only used as one
A detection sensor, providing corresponding sampling parameter to master board makes the master board of electric equipment products have corresponding Wen Shengjian
Brake.
The communication module 50 is for establishing controller 40 or the connection of 30 communication with the outside world of winding temperature detection circuit
Hardware function.It specifically can select corresponding hardware module based on a variety of different communication modes.For example, the communication
Module 50 can be WiFi modules, bluetooth module, GPRS communication modules etc..
The high in the clouds platform 60 can be the electronic computing platform for providing one or more kinds of application services.The cloud
End platform 60 provides hardware supported by server, and the detection signal from winding temperature detection circuit 30 is obtained by network 80.
The temperature that the high in the clouds platform 60 can also further push corresponding electric equipment products by network 80 to user terminal 70 is examined
It surveys as a result, playing reminding effect when the temperature is excessively high, to ensure the safe operation of electric equipment products.
In this application environment, the AC Electrical Machine Winding temperature sensing circuit 30, controller 40 and communication module 50,
High in the clouds platform 60 and user terminal 70 can form the organic component in smart home, provide corresponding security appliance work(
Energy.The temperature of each electric equipment products rises parameter in the record man that high in the clouds platform 60 can continue.User can pass through user terminal 70
Call or check that relevant temperature rises parameter information.
Further, the high in the clouds platform 60 can also support more intelligent function, such as temperature is risen parameter with automatic
The mode of transmission is pushed in user terminal 70.Or when the temperature rise of electric equipment products is to given threshold, automatic push report
Alert information starts shutdown defencive function, controls electric equipment products automatic shutdown, protects the operational safety of electric equipment products.
Fig. 5 is the functional block diagram of AC Electrical Machine Winding temperature sensing circuit 30 provided by the embodiments of the present application.Such as Fig. 5 institutes
Show, the AC Electrical Machine Winding temperature sensing circuit specifically includes：AC/DC isolating circuit 31, resistance detecting circuit 32 and place
Manage device 33.
Wherein, the AC/DC isolating circuit 31 is made of at least one inductance, has input terminal and output end.The friendship is straight
Stream isolation circuit 31 there is the alternating current separated between the input terminal and output end and allow DC current by electricity
Characteristic.
(i.e. the zero potential of AC power is neutral with the firewire ACL of AC power and zero curve ACN respectively at the both ends of winding to be measured
Point) connection.Since when alternating current generator works, the AC power loaded on winding can be destroyed and be interfered for carrying out equivalent electricity
The analog circuit of the resistance value detection of resistance.Therefore, AC/DC isolating circuit 31 can be utilized, its input terminal and machine winding M are made
Connection, AC power of the isolation load on winding M to be detected, to make real-time online detection equivalent resistance resistance value at
It is possible.
As shown in fig. 6, the AC/DC isolating circuit may include：First inductance L1, the second inductance L2 and the first electricity
Hold C1.
Wherein, one end of the second inductance L2 is one of input terminal connection terminal A, the other end with it is described
One end of first capacitance C1 connects；The other end of the first capacitance C1 is another connection terminal B of the input terminal.
One end of the first inductance L1 is one of output end connection terminal C, the other end and first capacitance
The anode connection of C1；The other end of first capacitance is another connection terminal D of the output end.
In some embodiments, the AC/DC isolating circuit can also include load resistance R0.The load resistance R0
One end connect with one end of the first capacitance C1, the other end of the other end of the load resistance and the first capacitance C1
Connection.
Specifically, first capacitance can be the electrolytic capacitor with larger capacitance amount.It is electricity in first capacitance
When solving capacitance, the anode of the electrolytic capacitor is connect with one end of the second inductance L2 and load resistance R0.The electrolysis electricity
The cathode of appearance is then grounded, and realizes the effect of above-mentioned alternating current-direct current isolation.
Fig. 7 is the schematic equivalent circuit of AC Electrical Machine Winding equivalent impedance transformation.As shown in fig. 7, indicating to be measured with RX
The corresponding equivalent resistance of AC Electrical Machine Winding, R20 and R10 indicate the corresponding direct current of the first inductance L1 and the second inductance L2 respectively
Resistance value, R0 are the resistance value of load resistance.
Connection relation according to figure 7, it can be seen that measured between the output end C and D of AC/DC isolating circuit
D.C. resistance RCB is：
Since R10, R20 and R0 are known quantity.It calculates the resistance value of RX thus, it is possible to derive and is：
After the resistance change for determining D.C. resistance RCB, the temperature that can calculate AC Electrical Machine Winding accordingly becomes
Change.
The test side of the resistance detecting circuit 32 is connect with the output end of the isolation circuit 31, and generation follows the friendship
The voltage signal for flowing the resistance value Rx of machine winding and changing.The resistance detecting circuit 32 can be based on electric current or voltage
The circuit of resistance value detection is carried out, such as the resistance value RCB between common bridge measurement output end C and D may be used.It generates
Voltage signal from the signal output end of the resistance detecting circuit export, be supplied to follow-up function module use.
Specifically, Fig. 5 is the resistance detecting circuit 32 provided by the embodiments of the present application realized based on bridge circuit.Such as Fig. 5
Shown, the resistance detecting circuit includes：Bridge-type detection unit 321, amplifying unit 322 and filter unit 323.
Wherein, the input of the bridge-type detection unit 321 is the test side of the resistance detecting circuit.It is handed over directly with described
The output end connection for flowing isolation circuit generates corresponding light current pressure letter according to the resistance change of the AC Electrical Machine Winding
Number, and exported in the signal output end of bridge-type detection unit.
As shown in fig. 6, in some embodiments, the bridge-type detection unit is by first resistor R1, second resistance R2, third electricity
Hinder R3 and DC power supply VCC compositions.
Wherein, one end of the first resistor R1 is connect with output end C, and one end of the first resistor R1 also forms first
Output pin 321c.The other end of the first resistor R1 is connect with one end of the second resistance R2, the first resistor R1's
The other end is also connect with the DC power supply VCC.
The other end of the second resistance R2 is connect with one end of the 3rd resistor R3, and the second resistance R2's is another
End also forms the second output pin 321d.The other end of the 3rd resistor R3 connect and is grounded with output end D.
First output pin and second output pin form the signal output end of the bridge-type detection unit.
In detection circuit shown in Fig. 6, first resistor R1, second resistance R2,3rd resistor R3 and output end CD it
Between all-in resistance RCB constitute one tool there are four bridge arm typical bridge circuit.The bridge circuit have 321a/321b and
The diagonal end of two of 321c/321d.Wherein, diagonally end is connect 21a/321b with DC power supply VCC, passes through the adjustment electric bridge
Circuit, it is 0 to enable the winding of alternating current generator diagonally hold the pressure difference of output in 321c/321d in normal temperature state (off working state).
It is such, when alternating current generator work certain time, after the temperature rise of AC Electrical Machine Winding, AC Electrical Machine Winding
Internal resistance can occur to change accordingly, and then equivalent resistance Rx is caused to change.When the resistance value of equivalent resistance Rx becomes
After change, corresponding DC resistance RCB can change, so that the balance of bridge circuit is destroyed, at 321c/321d pairs
Output is followed the weak voltage signal of the resistance change of equivalent resistance Rx by angle end.Also that is, the resistance value in equivalent resistance occurs
When variation, the weak voltage signal is exported from the first output pin 321c and the second output pin 321d.
In some embodiments, in order to further improve the stability of electric bridge detection unit and the accurate journey of testing result
Degree, the DC power supply VCC can also be grounded by filter capacitor C2.Interference letter is filtered out by way of increasing filter capacitor C2
Number.
The amplified signal input terminal of the amplifying unit 322 is connect with the voltage output end of the bridge-type detection unit, is used
In amplifying the weak voltage signal, the voltage signal is formed.The signal of the voltage signal from the resistance detecting circuit is defeated
Outlet is exported into the processor.The voltage amplifier circuit of any suitable type specifically may be used in the amplifying unit 322,
Weak voltage signal is amplified into specific multiple.For example, the amplifying circuit 33 can be the amplifying circuit based on operational amplifier
Or the amplifying circuit established based on other semiconductor elements.
Please continue to refer to Fig. 6, in some embodiments, the amplifying unit 322 specifically includes：Operational amplifier U1,
Three capacitance C3 and the 8th resistance R8.
The inverting input 1 and normal phase input end 2 of the operational amplifier respectively with the diagonal end of bridge-type detection unit 321
321c/321d connections follow the weak voltage signal of resistance change described in reception.The inverting input of the operational amplifier is logical
It crosses third capacitance C3 to connect with the output end 3 of the operational amplifier, the inverting input of the operational amplifier also passes through
Eight resistance R8 are connect with the output end of the operational amplifier.
In some embodiments, as shown in fig. 6,1 He of inverting input of the bridge-type detection unit and operational amplifier
It can also be connected in series with current-limiting resistance respectively between normal phase input end 2 to play metering function.Also that is, first output pin
321c can be connect by the 4th resistance R4 with the inverting input-of the operational amplifier；The second output pin 321d is then
It is connect with the normal phase input end of the operational amplifier by the 5th resistance R5.
In operation amplifier unit shown in Fig. 6, third capacitance C3 is connected between inverting input and output end
Feedback capacity.The operation amplifier unit for voltage amplification factor by the resistance value of the 8th resistance R8 and the 4th resistance R4 and
Ratio is determined.It in actual application, can be according to actual conditions, by adjusting the 8th resistance R8's and the 4th resistance R4
Ratio adjusts the amplification factor of voltage signal.
The amplified signal input terminal and the resistance detecting circuit of the filter unit 323 and the amplifying unit 322
Signal output end connects, for filtering out the interference signal generated in the weak voltage signal amplification process.
Please continue to refer to Fig. 6, in some embodiments, the filter unit 323 may include：7th resistance R7, the 9th
Resistance R9, the 4th capacitance C4 and the 5th capacitance C5.
Wherein, described 7th one end resistance R7 is connect with the normal phase input end 2 of the operational amplifier, other end ground connection.
One end of the 4th capacitance C4 is connect with the normal phase input end 2 of the operational amplifier, other end ground connection.9th resistance
The one end R9 is connect with the output end of the operational amplifier, and the other end is voltage signal output end.The 9th resistance R9's is another
One end also passes through the 5th capacitance C5 ground connection.
The 4th capacitance C4 and the 5th capacitance C5 is used as filter capacitor, can be filtered out other in amplification process
Interference signal, it is ensured that can export accurate voltage signal in the output end of operational amplifier, phase is calculated for subsequent processor
The winding temperature variation answered.
Processor 33 has corresponding number or analog signal interface, is connect with the signal output end, receives above-mentioned
Voltage signal and the resistance value Rx that AC Electrical Machine Winding is calculated by the formula that above-described embodiment discloses, and according to the resistance
Value, calculates the temperature change of AC Electrical Machine Winding.
Due to being closed there are corresponding between the D.C. resistance RCB between the resistance value Rx and output end CD of AC Electrical Machine Winding
System.Therefore, in order to simplify operation, formula can be changed according to resistance v. temperature, handed over by the variation of D.C. resistance RCB to calculate
Flow the temperature variations of machine winding.
Specifically, processor can calculate the temperature change of the AC Electrical Machine Winding by following formula：
Wherein, Δ t is the temperature change of AC Electrical Machine Winding, and RCB2 is current time, measures and obtains D.C. resistance RCB's
Resistance value (i.e. current resistive value), RCB1 are initial time, measure resistance value (the i.e. initial resistance for obtaining D.C. resistance RCB
Value), t1 is initial room-temperature, and t2 is current room temperature.K is winding coefficient, is determined by the material of winding.For example, the k values of copper winding
It is 234.5, the k values of aluminium winding are 225.
In conclusion in high induction reactance of the AC Electrical Machine Winding temperature sensing circuit provided in this embodiment based on inductance, it is real
Existing lower-cost AC/DC isolating circuit can be very good the working power for realizing alternating current generator and AC Electrical Machine Winding temperature
Isolation between detection circuit enables AC Electrical Machine Winding temperature sensing circuit be capable of being detected for real-time online.
It moreover, the circuit area of entire circuit is smaller, can be with a wide range of applications, can both be used as and be incorporated into friendship
Function module inside galvanic electricity machine makes corresponding alternating current generator or electric equipment products have corresponding winding temperature detection function,
Independent AC Electrical Machine Winding temperature monitor is can also be used as to use.
Through the above description of the embodiments, the technical staff in field can be understood that each embodiment can borrow
Help software that the mode of required general hardware platform is added to realize, naturally it is also possible to pass through hardware.Based on this understanding, above-mentioned
Substantially the part that contributes to existing technology can be expressed in the form of software products technical solution in other words, the meter
Calculation machine software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions
With so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment
Or the method described in certain parts of embodiment.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the claims of the application, every to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field includes similarly in the scope of patent protection of the application.
Claims (12)
1. a kind of AC Electrical Machine Winding temperature sensing circuit, which is characterized in that including：AC/DC isolating circuit, resistance detection electricity
Road and processor；
The AC/DC isolating circuit is made of at least one inductance, has input terminal and output end；The alternating current-direct current isolation electricity
Road is for separating the alternating current between the input terminal and the output end and DC current being allowed to pass through；
The test side of the resistance detecting circuit is connect with the output end of the AC/DC isolating circuit, is followed for generation described
The resistance value of AC Electrical Machine Winding and the voltage signal changed, the voltage signal are exported from the signal of the resistance detecting circuit
End output；
The processor is connect with the signal output end of the resistance detecting circuit, for receiving the voltage signal and according to institute
State the temperature change that voltage signal calculates current AC Electrical Machine Winding.
2. AC Electrical Machine Winding temperature sensing circuit according to claim 1, which is characterized in that the alternating current-direct current isolation electricity
Road includes：First inductance, the second inductance and the first capacitance；
One end of second inductance is one of the input terminal connection terminal, the other end of second inductance and institute
State one end connection of the first capacitance；The other end of first capacitance is another connection terminal of the input terminal；
One end of first inductance is one of the output end connection terminal, the other end of first inductance and institute
State the anode connection of the first capacitance；The other end of first capacitance is another connection terminal of the output end.
3. AC Electrical Machine Winding temperature sensing circuit according to claim 2, which is characterized in that the alternating current-direct current isolation electricity
Road further includes load resistance；
One end of the load resistance is connect with one end of first capacitance, the other end of the load resistance and described first
The other end of capacitance connects.
4. AC Electrical Machine Winding temperature sensing circuit according to claim 1, which is characterized in that the resistance detecting circuit
Including：Bridge-type detection unit, amplifying unit and filter unit；
The output end that the bridge-type detection unit passes through the test side and the AC/DC isolating circuit of the resistance detecting circuit
Connection, it is corresponding weak in the generation of the voltage output end of bridge-type detection unit according to the resistance change of the AC Electrical Machine Winding
Voltage signal；
The amplified signal input terminal of the amplifying unit is connect with the voltage output end of the bridge-type detection unit, for amplifying
Weak voltage signal is stated, the voltage signal is formed；The voltage signal is exported from the signal output end of the resistance detecting circuit；
The signal output end of the filter unit and the amplified signal input terminal and the resistance detecting circuit of the amplifying unit
Connection, for filtering out the interference signal generated in the weak voltage signal amplification process.
5. AC Electrical Machine Winding temperature sensing circuit according to claim 4, which is characterized in that the bridge-type detection unit
Including：First resistor, second resistance, 3rd resistor and DC power supply；
One end of the first resistor is connect with a connection terminal of the output end, and one end of the first resistor is also formed
First output pin；The other end of the first resistor is connect with one end of the second resistance, the other end of the first resistor
Also it is connect with the DC power supply；
The other end of the second resistance is connect with one end of the 3rd resistor, and the other end of the second resistance also forms
Two output pins；The other end of the 3rd resistor connect and is grounded with another connection terminal of the output end；
When the resistance value of the AC Electrical Machine Winding changes, exported from first output pin and second output pin
Corresponding weak voltage signal.
6. AC Electrical Machine Winding temperature sensing circuit according to claim 4, which is characterized in that the amplifying unit packet
It includes：Operational amplifier, third capacitance and the 8th resistance；
The inverting input and normal phase input end of the operational amplifier are signal receiving end, for receiving the light current pressure letter
Number；
The inverting input of the operational amplifier is connect by third capacitance with the output end of the operational amplifier, the fortune
The inverting input for calculating amplifier is also connect by the 8th resistance with the output end of the operational amplifier.
7. AC Electrical Machine Winding temperature sensing circuit according to claim 6, which is characterized in that the filter unit packet
It includes：7th resistance, the 9th resistance, the 4th capacitance and the 5th capacitance；
Described 7th resistance one end is connect with the normal phase input end of the operational amplifier, other end ground connection；4th capacitance
One end connect with the normal phase input end of the operational amplifier, the other end ground connection；
Described 9th resistance one end is connect with the output end of the operational amplifier, and the other end forms the detection signal output
End；The other end of 9th resistance also passes through the 5th capacity earth.
8. AC Electrical Machine Winding temperature sensing circuit according to claim 6, which is characterized in that the amplifying unit also wraps
Include the 4th resistance and the 5th resistance；
First output pin is connect by the 4th resistance with the inverting input of the operational amplifier；Described second is defeated
Go out foot to connect with the normal phase input end of the operational amplifier by the 5th resistance.
9. AC Electrical Machine Winding temperature sensing circuit according to claim 1, which is characterized in that the processing implement body is used
In：
According to the voltage signal of reception, the resistance change situation of the AC Electrical Machine Winding is calculated；
According to the resistance change situation, the temperature change of the AC Electrical Machine Winding is calculated.
10. AC Electrical Machine Winding temperature sensing circuit according to claim 9, which is characterized in that the processor passes through
Following formula calculates the temperature change of the AC Electrical Machine Winding：
Wherein, Δ t is the temperature change of the AC Electrical Machine Winding, and RCB2 is current time, the AC/DC isolating circuit
The current resistive value of output end, RCB1 are the moment, the output end of the AC/DC isolating circuit, and t1 is initial room-temperature, and t2 is
Current room temperature, k are winding coefficient.
11. a kind of temperature monitor, which is characterized in that include the AC Electrical Machine Winding temperature as described in claim 1-10 is any
Detection circuit, detection terminal and display device；
The input terminal of the AC Electrical Machine Winding temperature sensing circuit extends to form detection terminal, and the detection terminal is used for and friendship
The AC Electrical Machine Winding of galvanic electricity machine connects；
The processor of the AC Electrical Machine Winding temperature sensing circuit is used to calculate the temperature change of AC Electrical Machine Winding；It is described aobvious
Showing device is connected to the processor, the temperature change for showing the AC Electrical Machine Winding.
12. a kind of alternating current generator, including machine winding and power switch, which is characterized in that further include such as claim 1-10
Any AC Electrical Machine Winding temperature sensing circuit；
The input terminal of the AC Electrical Machine Winding temperature sensing circuit is connect with the AC Electrical Machine Winding, the alternating current generator around
The processor of group temperature sensing circuit is connect with the power switch, and the processor is used for according to the AC Electrical Machine Winding
Temperature change controls the operation of the alternating current generator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/083391 WO2019200534A1 (en) | 2018-04-17 | 2018-04-17 | Ac motor winding temperature detection circuit, temperature detector and ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108780012A true CN108780012A (en) | 2018-11-09 |
Family
ID=64029086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880000903.6A Pending CN108780012A (en) | 2018-04-17 | 2018-04-17 | AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108780012A (en) |
| WO (1) | WO2019200534A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019200534A1 (en) * | 2018-04-17 | 2019-10-24 | 深圳和而泰数据资源与云技术有限公司 | Ac motor winding temperature detection circuit, temperature detector and ac motor |
| CN111044817A (en) * | 2019-12-10 | 2020-04-21 | 格力电器（武汉）有限公司 | Temperature rise test system and test method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789761A (en) * | 2010-02-02 | 2010-07-28 | 杭州电子科技大学 | Capacitance negative feedback type low noise amplifier |
| CN102969986A (en) * | 2012-11-19 | 2013-03-13 | 苏州远创达科技有限公司 | Output circuit structure of radio frequency power amplifier |
| CN203536565U (en) * | 2013-04-08 | 2014-04-09 | 大连植拓船舶技术有限公司 | Magnetic antenna for receiving Loran-C signal for high-speed motor-driven vehicle |
| CN104682730A (en) * | 2013-11-29 | 2015-06-03 | 西安国龙竹业科技有限公司 | Isolated alternating-direct current converting circuit |
| CN105510680A (en) * | 2016-01-27 | 2016-04-20 | 中车株洲电力机车有限公司 | Alternating current and direct current net voltage detection device |
| CN207053414U (en) * | 2017-07-10 | 2018-02-27 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
| CN107907831A (en) * | 2017-12-22 | 2018-04-13 | 深圳和而泰数据资源与云技术有限公司 | Winding temperature detection circuit, temperature measurement control system and temperature monitor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108780012A (en) * | 2018-04-17 | 2018-11-09 | 深圳和而泰数据资源与云技术有限公司 | AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator |
-
2018
- 2018-04-17 CN CN201880000903.6A patent/CN108780012A/en active Pending
- 2018-04-17 WO PCT/CN2018/083391 patent/WO2019200534A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789761A (en) * | 2010-02-02 | 2010-07-28 | 杭州电子科技大学 | Capacitance negative feedback type low noise amplifier |
| CN102969986A (en) * | 2012-11-19 | 2013-03-13 | 苏州远创达科技有限公司 | Output circuit structure of radio frequency power amplifier |
| CN203536565U (en) * | 2013-04-08 | 2014-04-09 | 大连植拓船舶技术有限公司 | Magnetic antenna for receiving Loran-C signal for high-speed motor-driven vehicle |
| CN104682730A (en) * | 2013-11-29 | 2015-06-03 | 西安国龙竹业科技有限公司 | Isolated alternating-direct current converting circuit |
| CN105510680A (en) * | 2016-01-27 | 2016-04-20 | 中车株洲电力机车有限公司 | Alternating current and direct current net voltage detection device |
| CN207053414U (en) * | 2017-07-10 | 2018-02-27 | 深圳市保益新能电气有限公司 | A kind of high-frequency isolation ac-dc conversion circuit |
| CN107907831A (en) * | 2017-12-22 | 2018-04-13 | 深圳和而泰数据资源与云技术有限公司 | Winding temperature detection circuit, temperature measurement control system and temperature monitor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019200534A1 (en) * | 2018-04-17 | 2019-10-24 | 深圳和而泰数据资源与云技术有限公司 | Ac motor winding temperature detection circuit, temperature detector and ac motor |
| CN111044817A (en) * | 2019-12-10 | 2020-04-21 | 格力电器（武汉）有限公司 | Temperature rise test system and test method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019200534A1 (en) | 2019-10-24 |
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