CN108982959A - Motor control three-phase voltage sample circuit - Google Patents
Motor control three-phase voltage sample circuit Download PDFInfo
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- CN108982959A CN108982959A CN201810863832.4A CN201810863832A CN108982959A CN 108982959 A CN108982959 A CN 108982959A CN 201810863832 A CN201810863832 A CN 201810863832A CN 108982959 A CN108982959 A CN 108982959A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
Motor control three-phase voltage sample circuit of the present invention includes: three groups of scaling circuits, each scaling circuit is respectively provided with a first input end, one second input terminal and an output end, and the first input end of each scaling circuit is separately connected the three-phase voltage output end of motor；Reference data circuit, to generate a reference voltage, and the first input end for each scaling circuit that is added to respectively；Main control unit, each end AD are connected with the output end of each scaling circuit respectively.The first input end of each scaling circuit is separately connected three-phase electricity pressure side；Reference voltage is added to the first input end of each scaling circuit respectively, so that three-phase voltage is connected on the same terminal, three-phase voltage has just obtained a reference center point；Low-voltage signal is converted to through scaling circuit again, by the way that motor three-phase voltage then can be obtained after main control unit sampling, processing.The present invention has the advantages that at low cost, strong antijamming capability, high reliablity.
Description
Technical field
The present invention relates to technical field of motors, and in particular to a kind of motor control three-phase voltage sample circuit.
Background technique
The phase voltage of three phase alternating current motor plays an important role in electric machine control system, the standard of the detection of three-phase voltage
True property directly determines the accuracy of the controls such as the revolving speed to threephase motor, torque.
Three-phase voltage sampling plan currently on the market, generally existing higher cost, anti-interference ability are low, poor reliability
Problem, therefore it is necessary to provide a kind of new three-phase voltage sampling plans, to solve problems of the prior art.
Summary of the invention
The technical issues of in order to solve generally existing higher cost in existing three-phase voltage sampling plan, the present invention provide
A kind of motor control three-phase voltage sample circuit.
Motor control of the present invention three-phase voltage sample circuit includes three groups of scaling circuits, reference data circuit and master
Control unit；Wherein, each scaling circuit is respectively provided with a first input end, one second input terminal and an output end,
The first input end of each scaling circuit is separately connected the three-phase voltage output end of motor；Reference data circuit to
A reference voltage is generated, and the first input end for each scaling circuit that is added to respectively；Main control unit has programming
Function and multiple ends AD, each end AD are connected with the output end of each scaling circuit respectively.
The null theorem of the sum of three-phase voltage according to motor, if the three-phase voltage of motor is respectively Ua, Ub and Uc, then
There is Ua+Ub+Uc=0.Since three-phase motor only picks out triple line, there is no zero curve can for reference, therefore in the present invention, by reference to
Reference circuit generates a reference voltage (voltage of reference voltage terminal), and U, V, W three-phase voltage pass through resistance R31, resistance respectively
R32, resistance R33 are connected on a bit (i.e. reference voltage terminal), and reference voltage terminal passes through resistance R8 again and is connected to benchmark electricity
On pressure side, so that U, V, W three-phase voltage have just obtained a reference center point；Reference center point is added to each ratio respectively again
The first input end of example computing circuit, as the reference voltage of scaling circuit, U, V, W three-phase voltage pass through scale operation electricity
High-voltage signal is converted to low-voltage signal by road, and the port AD for being input to main control unit is sampled, and then may be used after main control unit processing
Obtain motor three-phase voltage.The present invention provides a kind of new motor control three-phase voltage sample circuits, have at low cost, anti-
The advantages of interference performance is strong, high reliablity.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the reference data circuit according to
The reference voltage generates a reference voltage, and it is second defeated to be respectively transmitted to each scaling circuit for the reference voltage
Enter end.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the reference data circuit includes
To generate reference voltage generator, resistance R8, resistance R31, resistance R32, the resistance R33, reference voltage of the reference voltage
Terminal and reference voltage terminal, the resistance R31, resistance R32, resistance R33 one end be commonly connected to the of the resistance R8
The second end of one end, the resistance R8 connects the reference voltage terminal, and the reference voltage terminal is to connect the benchmark
Voltage, the reference voltage terminal be connected to the resistance R8, resistance R31, resistance R32, resistance R33 connection divider node
On, and connected respectively with each second input terminal of scaling circuit.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, each scaling circuit
Including resistance R1, resistance R2, resistance R4, resistance R5, resistance R6 and operational amplifier A1；The first end of the resistance R1 is as institute
The first input end of scaling circuit is stated, the second end of the resistance R1 is connected to the operation amplifier by the resistance R5
The reverse input end of device A1, the resistance R2 are connected to the second end of the resistance R1 and the output end of the operational amplifier A1
Between, the second end of second input terminal of the first end of the resistance R4 as the scaling circuit, the resistance R4 connects
It is connected to the noninverting input of the operational amplifier A1, the output end of the operational amplifier A1 also passes through the resistance R6 connection
In the end AD.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the scaling circuit also connects
Connect a filter circuit.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the filter circuit includes capacitor
C1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, the resistance R1 second end pass through the capacitor C1 be grounded, the resistance
The first end of R4 is grounded by the capacitor C3, and the second end of the resistance R4 is grounded by the capacitor C4, the capacitor C5
It is connected between the resistance R5 and the output end of the operational amplifier A1, be connected to the end AD one of the resistance R6
End is grounded by the capacitor C6.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the reference voltage generator packet
Include resistance R12, resistance R13, resistance R14, capacitor C13, capacitor C14,5V voltage terminal and operational amplifier A2；The 5V voltage
Terminal is connected to the first end of the resistance R12, and the second end of the resistance R12 is connected to the same phase of the operational amplifier A2
Input terminal, the second end of the resistance R12 also pass through the resistance R13 ground connection, and the ground terminal of the resistance R13 also passes through described
Capacitor C13 is connected to the non-inverting input terminal of the operational amplifier A2, and the inverting input terminal of the operational amplifier A2 is connected to
The output end and the reference voltage terminal of the operational amplifier A2, the output end of the operational amplifier A2 also pass through resistance
R14 is connected to the first end of the capacitor C14, the second end ground connection of the capacitor C14, and the first end of the capacitor C14 also connects
It is connected to the end AD.
Motor control of the present invention three-phase voltage sample circuit further improvement lies in that, the main control unit is according to following
The three-phase voltage of the motor is calculated in formula:
Wherein:
Wherein, Ua, Ub and Uc are respectively the phase voltage of U, V, W three-phase of the motor,For the scale operation electricity
The amplification coefficient on road, VREF are the reference voltage of the scaling circuit, i.e. U, V, the reference center point electricity of W three-phase voltage
Pressure, Uo1, Uo2 and Uo3 are respectively the output end voltage of the scaling circuit corresponding to Ua, Ub and Uc, and Uo is the base
Quasi- voltage generator is input to the voltage at the end the main control unit AD.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the motor control three-phase voltage sample circuit of the embodiment of the present invention.
Fig. 2 is the electrical block diagram of the amplifying circuit of embodiment in Fig. 1.
Fig. 3 is the electrical block diagram of the reference data circuit of embodiment in Fig. 1.
Specific embodiment
In order to solve, generally existing higher cost, anti-interference ability in existing three-phase voltage sampling plan be low, reliability
The technical problem of difference, the present invention provides a kind of motor control three-phase voltage sample circuits.
In the following with reference to the drawings and specific embodiments to the preferable implementation of motor control of the present invention three-phase voltage sample circuit
Example is described further.Those skilled in the art can be understood easily that of the invention other are excellent by content disclosed by this specification
Point and effect.
In conjunction with shown in Fig. 1 to Fig. 3, a kind of motor control three-phase voltage sample circuit of the present invention, including three groups of ratio fortune
Calculate circuit 20, reference data circuit 10 and main control unit 30；Wherein, each scaling circuit 20 is respectively provided with one first input
End, one second input terminal and an output end, the first input end of each scaling circuit 20 are separately connected the three-phase electricity of motor M
Press output end；Reference data circuit 10 is to generate a reference voltage, and the of each scaling circuit 20 that is added to respectively
One input terminal；Main control unit 30 have programing function and multiple ends AD, each end AD respectively with each scaling circuit 20
Output end connection.Specifically, main control unit 30 is single-chip microcontroller, collected data is handled, in conjunction with software algorithm to electricity
Machine M is controlled.
The null theorem of the sum of three-phase voltage according to motor, if the three-phase voltage of motor M is respectively Ua, Ub and Uc,
Then there is Ua+Ub+Uc=0.Since three-phase motor M only picks out triple line, there is no zero curves to pass through for reference, therefore in the present invention
Reference data circuit 10 generates a reference voltage (voltage of reference voltage terminal Ud), and U, V, W three-phase voltage pass through resistance respectively
R31, resistance R32, resistance R33 are connected on a bit (i.e. reference voltage terminal VREF), and reference voltage terminal VREF passes through electricity again
Resistance R8 is connected on reference voltage terminal Ud, so that U, V, W three-phase voltage have just obtained a reference center point；Reference center point
And the first input end for each scaling circuit 20 that is added to respectively, as the reference voltage of scaling circuit 20, U, V, W
High-voltage signal is converted to low-voltage signal by scaling circuit 20 by three-phase voltage, and the port AD for being input to main control unit carries out
Motor M three-phase voltage then can be obtained after main control unit processing in sampling.The present invention provides a kind of new motor control three-phase electricities
Sample circuit is pressed, has the advantages that at low cost, strong antijamming capability, high reliablity.
Further, reference data circuit 10 generates a reference voltage according to reference voltage, and reference voltage is respectively transmitted to
Second input terminal of each scaling circuit 20.Reference data circuit 10 generates a reference voltage according to reference voltage, as
The voltage of reference center point.
Further, reference data circuit 10 includes reference voltage generator 40, the resistance to generate reference voltage
R8, resistance R31, resistance R32, resistance R33, reference voltage terminal Ud and reference voltage terminal VREF, resistance R31, resistance R32,
One end of resistance R33 is commonly connected to the first end of resistance R8, and the second end of resistance R8 connects reference voltage terminal Ud, with reference to electricity
The sub- VREF of pressure side be connected to resistance R8, resistance R31, resistance R32, resistance R33 connection divider node on, and respectively with each ratio
Example 20 second input terminal of computing circuit connection.Reference voltage terminal VREF in the present embodiment is U, V, the ginseng of W three-phase voltage
Examine central point.
Further, each scaling circuit 20 include resistance R1, resistance R2, resistance R4, resistance R5, resistance R6 and
Operational amplifier A1；First input end of the first end of resistance R1 as scaling circuit 20, the second end of resistance R1 pass through
Resistance R5 is connected to the reverse input end of operational amplifier A1, and resistance R2 is connected to the second end and operational amplifier A1 of resistance R1
Output end between, second input terminal of the first end of resistance R4 as scaling circuit 20, resistance R4 second end connection
In the noninverting input of operational amplifier A1, the output end of operational amplifier A1 also passes through resistance R6 and is connected to the end AD.
Further, scaling circuit 20 is also connected with a filter circuit.
Further, filter circuit includes capacitor C1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, and the of resistance R1
Two ends are grounded by capacitor C1, and the first end of resistance R4 is grounded by capacitor C3, and the second end of resistance R4 is grounded by capacitor C4,
Capacitor C5 is connected between resistance R5 and the output end of operational amplifier A1, and one end for being connected to the end AD of resistance R6 passes through capacitor
C6 ground connection.
Further, reference voltage generator 40 includes resistance R12, resistance R13, resistance R14, capacitor C13, capacitor
C14,5V voltage terminal and operational amplifier A2；5V voltage terminal is connected to the first end of resistance R12, the second end of resistance R12
It is connected to the non-inverting input terminal of operational amplifier A2, the second end of resistance R12 also passes through resistance R13 and is grounded, the ground connection of resistance R13
End is also connected to the non-inverting input terminal of operational amplifier A2 by capacitor C13, and the inverting input terminal of operational amplifier A2 is connected to
The output end and reference voltage terminal Ud of operational amplifier A2, the output end of operational amplifier A2 also pass through resistance R14 and are connected to
The first end of capacitor C14, the second end ground connection of capacitor C14, the first end of capacitor C14 are also attached to the end AD.This in the present embodiment
Computing circuit is voltage follow computing circuit, and feature is that operational amplifier output terminal voltage is equal to opamp input terminal electricity
Pressure, non-inverting input terminal voltage is the voltage Ue that 5V passes through that resistance R12 and resistance R13 are divided, generally by resistance R12 and resistance
R13 setting is equal, makes voltage Ue 2.5V or so, inverting input terminal is connected with the output end of operational amplifier, therefore output end is electric
Uo is pressed to be equal to voltage Ue；Reference voltage terminal Ud is connected to the output end of operational amplifier A2, then the electricity of reference voltage terminal Ud
Pressure value Ud is equal to Uo, then is equal to Ue according to reference voltage generator 40 Uo and Ud；The output end of operational amplifier A2 connects
In the end AD of main control unit.
Specifically, by taking the sampling process of one of phase voltage Ua as an example, Ua phase voltage is connected to the same of operational amplifier
Phase input terminal and inverting input terminal, it is that million grades of resistance is composed in series that resistance R1, which is usually by 4 resistance values, prevent single resistance by
It is damaged in underpower, resistance R1 and resistance R2 and operational amplifier together constitute scaling circuit 20, and high pressure is believed
Number be converted to the low-voltage signal in 30 acquisition range of main control unit, the parameter of each resistance and capacitor can be according to the actual situation
It is adjusted.
In addition, prime uses unlimited gain multiple feedback second order active low-pass filter circuit in the present embodiment, by resistance
R1, capacitor C1, resistance R5, capacitor C5, resistance R2 and operational amplifier A1 collectively form this filter network, use this filter network
Benefit be to avoid passband amplification factor excessive and generate self-oscillation, and the problem of cause sample circuit can not work normally,
Increase level-one RC filtering again in the output end of amplifier simultaneously, is made of, is enhanced in entire sampling process resistance R6 and capacitor C6
Anti-interference ability improves the sampling precision of three-phase voltage.
In the present embodiment, the three-phase voltage output end of motor M passes through resistance R31, resistance R32, resistance R33 respectively and is connected to
Resistance R8, wherein the resistance value of resistance R32 and resistance R33 are equal to resistance R31, and the resistance value of resistance 31 is far longer than resistance R8.
Reference voltage terminal VREF is reference center point, and the U phase output terminal Ua of motor M is connected to reference voltage terminal by resistance R31
The V phase output terminal Ub of VREF, motor M are connected to reference voltage terminal VREF by resistance R32, and the W phase output terminal Uc of motor M is logical
It crosses resistance R33 and is connected to reference voltage terminal VREF, reference voltage terminal VREF also passes through resistance R8 and is connected to reference voltage terminal
Sub- Ud.
The voltage of reference voltage terminal Ud is Ud, while can be obtained according to circuit and three-phase voltage principle:
Ua+Ub+Uc=0
From reference voltage generator 40 in the present embodiment:
Ud=Uo
Again because of R31=R32=R33 in the present embodiment
It can obtain:
From 20 structure of scaling circuit of the present embodiment:
It can obtain, the three-phase voltage of motor M can be calculated in main control unit 30 according to the following formula:
Wherein:
Wherein, Ua, Ub and Uc are respectively the phase voltage of U, V, W three-phase of motor M,For putting for scaling circuit 20
Big coefficient, VREF are the reference voltage of scaling circuit 20, i.e. U, V, the reference center point voltage of W three-phase voltage, with reference to base
The reference voltage of quasi- circuit 10, Uo1, Uo2 and Uo3 are respectively the output end of scaling circuit 20 corresponding to Ua, Ub and Uc
Voltage, Uo are the voltage at the end AD that benchmark voltage generator 40 is input to main control unit 30.
By three-phase voltage sampled signal Uo1, Uo2 and Uo3 and reference voltage generator output voltage of amplifier output end
Uo is sent to the end AD of main control unit 30, and main control unit 30 can obtain three-phase voltage sampled signal and reference voltage generator
The specific AD value of output voltage Uo just obtains three-phase voltage by software inhouse calculating according to above formula and main control unit 30
Instantaneous voltage value, the revolving speed of motor M, torque can further be controlled using three-phase voltage value.
The above is only presently preferred embodiments of the present invention, not do limitation in any form to the present invention, although this
Invention has been disclosed in a preferred embodiment above, and however, it is not intended to limit the invention, any person skilled in the art,
In the range of not departing from technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to
With the equivalent embodiment of variation, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention to
Any simple modification, equivalent change and modification made by upper embodiment, all of which are still within the scope of the technical scheme of the invention.
It should be noted that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate
The bright revealed content of book is not intended to limit the invention enforceable limit so that those skilled in the art understands and reads
Fixed condition, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, not
It influences still fall in disclosed technology contents under the effect of present invention can be generated and the purpose that can reach
In the range of capable of covering.
Claims (8)
1. a kind of motor control three-phase voltage sample circuit characterized by comprising
Three groups of scaling circuits, each scaling circuit be respectively provided with a first input end, one second input terminal and
The first input end of one output end, each scaling circuit is separately connected the three-phase voltage output end of motor；
Reference data circuit, to generate a reference voltage, and the first of each scaling circuit that is added to respectively is defeated
Enter end；
Main control unit, have programing function and multiple ends AD, each end AD respectively with each scaling circuit
Output end connection.
2. motor control as described in claim 1 three-phase voltage sample circuit, it is characterised in that: the reference data circuit
A reference voltage is generated according to the reference voltage, the reference voltage is respectively transmitted to the of each scaling circuit
Two input terminals.
3. motor control as claimed in claim 2 three-phase voltage sample circuit, it is characterised in that: the reference data circuit
Including the reference voltage generator to generate the reference voltage, resistance R8, resistance R31, resistance R32, resistance R33, reference
Voltage terminal and reference voltage terminal, the resistance R31, resistance R32, resistance R33 one end be commonly connected to the resistance R8
First end, the second end of the resistance R8 connects the reference voltage terminal, and the reference voltage terminal is described to connect
Reference voltage, the reference voltage terminal be connected to the resistance R8, resistance R31, resistance R32, resistance R33 connection partial pressure section
On point, and connected respectively with each second input terminal of scaling circuit.
4. motor control as claimed in claim 3 three-phase voltage sample circuit, it is characterised in that: each scale operation
Circuit includes resistance R1, resistance R2, resistance R4, resistance R5, resistance R6 and operational amplifier A1；
First input end of the first end of the resistance R1 as the scaling circuit, the second end of the resistance R1 pass through
The resistance R5 is connected to the reverse input end of the operational amplifier A1, and the resistance R2 is connected to the second of the resistance R1
End the output end of the operational amplifier A1 between, the first end of the resistance R4 as the scaling circuit second
Input terminal, the second end of the resistance R4 are connected to the noninverting input of the operational amplifier A1, the operational amplifier A1
Output end also pass through the resistance R6 and be connected to the end AD.
5. motor control as claimed in claim 4 three-phase voltage sample circuit, it is characterised in that: the scaling circuit
It is also connected with a filter circuit.
6. motor control as claimed in claim 5 three-phase voltage sample circuit, it is characterised in that: the filter circuit includes
Capacitor C1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, the resistance R1 second end by the capacitor C1 be grounded, it is described
The first end of resistance R4 is grounded by the capacitor C3, and the second end of the resistance R4 is grounded by the capacitor C4, the electricity
Hold C5 to be connected between the resistance R5 and the output end of the operational amplifier A1, the resistance R6's is connected to the end AD
One end pass through the capacitor C6 be grounded.
7. motor control as claimed in claim 3 three-phase voltage sample circuit, it is characterised in that: the reference voltage generates
Device includes resistance R12, resistance R13, resistance R14, capacitor C13, capacitor C14,5V voltage terminal and operational amplifier A2；
The 5V voltage terminal is connected to the first end of the resistance R12, and the second end of the resistance R12 is connected to the operation
The non-inverting input terminal of amplifier A2, the second end of the resistance R12 also pass through the resistance R13 ground connection, and the resistance R13's connects
Ground terminal is also connected to the non-inverting input terminal of the operational amplifier A2 by the capacitor C13, and the operational amplifier A2's is anti-
Phase input terminal is connected to the output end and the reference voltage terminal of the operational amplifier A2, and the operational amplifier A2's is defeated
Outlet also passes through the first end that resistance R14 is connected to the capacitor C14, the second end ground connection of the capacitor C14, the capacitor
The first end of C14 is also attached to the end AD.
8. motor control as claimed in claim 3 three-phase voltage sample circuit, which is characterized in that the main control unit according to
The three-phase voltage of the motor is calculated in following formula:
Wherein:
Wherein, Ua, Ub and Uc are respectively the phase voltage of U, V, W three-phase of the motor,For the scaling circuit
Amplification coefficient, reference voltage of the VREF for the scaling circuit, i.e. U, V, the reference center point voltage of W three-phase voltage,
Uo1, Uo2 and Uo3 are respectively the output end voltage of the scaling circuit corresponding to Ua, Ub and Uc, and Uo is the benchmark
Voltage generator is input to the voltage at the end the main control unit AD.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810863832.4A CN108982959B (en) | 2018-08-01 | 2018-08-01 | Three-phase voltage sampling circuit for motor control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863832.4A CN108982959B (en) | 2018-08-01 | 2018-08-01 | Three-phase voltage sampling circuit for motor control |
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| CN108982959B CN108982959B (en) | 2021-02-19 |
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| CN110018341A (en) * | 2019-04-17 | 2019-07-16 | 上海金脉电子科技有限公司 | Phase voltage detection circuit |
| CN110716082A (en) * | 2019-09-24 | 2020-01-21 | 哈尔滨工业大学（威海） | Terminal voltage acquisition and compensation method for improving precision of power-stage motor simulator |
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| CN204789716U (en) * | 2015-06-19 | 2015-11-18 | 河南康派智能技术有限公司 | Three -phase alternating current piezoelectricity of being applied to electric power instrument flows acquisition circuit |
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| CN1630186A (en) * | 2003-12-19 | 2005-06-22 | 三菱电机株式会社 | Voltage generation circuit |
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| CN110018341B (en) * | 2019-04-17 | 2021-08-17 | 上海金脉电子科技有限公司 | Phase voltage detection circuit |
| CN110716082A (en) * | 2019-09-24 | 2020-01-21 | 哈尔滨工业大学（威海） | Terminal voltage acquisition and compensation method for improving precision of power-stage motor simulator |
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| CN108982959B (en) | 2021-02-19 |
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