CN107565873A - The terminal voltage measurement apparatus and measuring method of motor - Google Patents
The terminal voltage measurement apparatus and measuring method of motor Download PDFInfo
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- CN107565873A CN107565873A CN201710914675.0A CN201710914675A CN107565873A CN 107565873 A CN107565873 A CN 107565873A CN 201710914675 A CN201710914675 A CN 201710914675A CN 107565873 A CN107565873 A CN 107565873A
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Abstract
The present invention relates to Motor Control Field, disclose the terminal voltage measurement apparatus and measuring method of a kind of motor, wherein, the motor is connected with motor drive module, the motor drive module is used to export PWM (pulsewidth modulation) voltage drive signals to the motor to drive the motor operation, and the terminal voltage measurement apparatus includes：Voltage integrating meter module, for calculating integrated value of the PWM voltage drive signals in a PWM cycle；Terminal voltage computing module, the terminal voltage for the motor according to the computation of Period of the integrated value and the PWM voltage drive signals.Technical scheme provided by the invention can may advantageously facilitate the large-area applications of position-sensor-free technology with the more efficient terminal voltage for obtaining motor exactly.
Description
Technical field
The present invention relates to technical field of motors, terminal voltage measurement apparatus and a kind of motor more particularly to a kind of motor
Terminal voltage measuring method.
Background technology
With the rapid development of Power Electronic Technique, alternating-current variable frequency motor is widely applied in industrial quarters.Exchanging
In the control system of variable-frequency motor, control algolithm is to determine the core of control system performance.Sensor is accurate in control system
Degree will directly affect the effect of control algolithm.For the variable-frequency motor using the control of PWM (pulsewidth modulation) signal, on its stator
Voltage is the PWM forms of high frequency, and sensor can not measure in real time.Industrial quarters often combines control with the busbar voltage of inverter at present
The built-in command of chip calculates the terminal voltage of motor.This method can not accurately consider the non-linear voltage damage brought of inverter
Lose, generate larger error.
The terminal voltage measurement of alternating-current variable frequency motor not only influences motor control performance, and to position Sensorless Control skill
The development of art has great importance.Sensorless Control Technique refers to utilize the relevant electric signal in machine winding to include
Motor terminal voltage signal etc., electrically and mechanically position and rotating speed of rotor etc. are estimated by proper method, passed so as to substitute
Sensor, realize the closed-loop control of motor.In the not high application scenario of reliability requirement, can be saved using position-sensor-free technology
About cost, save purchase, the work of rotor-position sensor is installed；In the high occasion of reliability requirement, position-sensor-free skill
Art can cause system worked well as the backup of position sensor in the case of the sensor failure of position.The end of motor
Voltage measurement be influence position-sensor-free technology at present can not large-area applications a key factor.
The content of the invention
The invention aims to overcome above-mentioned technical problem existing for prior art, there is provided one kind can be more efficient
The terminal voltage of motor is obtained exactly, to promote the technical scheme of the large-area applications of position-sensor-free technology.
To achieve these goals, first aspect present invention provides a kind of terminal voltage measurement apparatus of motor, the motor
It is connected with motor drive module, the motor drive module is used to export PWM voltage drive signals to the motor to drive
Motor operation is stated, the terminal voltage measurement apparatus includes：
Voltage integrating meter module, for calculating integrated value of the PWM voltage drive signals in a PWM cycle；And
Terminal voltage computing module, for according to the computation of Period of the integrated value and the PWM voltage drive signals
The terminal voltage of motor.
Preferably, the motor is three phase electric machine, and the motor drive module is three-phase inverter, the three phase electric machine
Three-phase terminal is connected respectively the three-phase output end of described three-phase inverter.
Preferably, the terminal voltage measurement apparatus also includes：
Voltage reduction module, for calculating product of the PWM voltage drive signals in a PWM cycle in the voltage integrating meter module
Before score value, the PWM voltage drive signals are reduced to predetermined amplitude.
Preferably, the voltage reduction module includes：
First pressure unit, for the PWM voltage drive signals of the first output end of the three-phase inverter to be reduced to
Predetermined amplitude；
Second pressure unit, for the PWM voltage drive signals of the second output end of the three-phase inverter to be reduced to
Predetermined amplitude；
3rd pressure unit, for the PWM voltage drive signals of the 3rd output end of the three-phase inverter to be reduced to
Predetermined amplitude.
Preferably, the voltage integrating meter module includes：
First voltage integral unit, for calculating the PWM for being reduced to predetermined amplitude of the first pressure unit output
Integrated value of the voltage drive signals in a PWM cycle；
Second voltage integral unit, for calculating the PWM for being reduced to predetermined amplitude of the second pressure unit output
Integrated value of the voltage drive signals in a PWM cycle；
Tertiary voltage integral unit, for calculating the PWM for being reduced to predetermined amplitude of the 3rd pressure unit output
Integrated value of the voltage drive signals in a PWM cycle.
Preferably, each in first pressure unit, second pressure unit and the 3rd pressure unit
Unit includes first resistor unit and second resistance unit, wherein, one end and the corresponding motor of the first resistor unit
Terminal is connected, and the other end connects one end of the second resistance unit, the other end ground connection of the second resistance unit；Described
The public affairs of one pressure unit, the first resistor unit of second pressure unit and the 3rd pressure unit and second resistance unit
End is connected respectively the input of the first voltage integral unit, the input of the second voltage integral unit and institute altogether
State the input of tertiary voltage integral unit.
Preferably, the terminal voltage computing module calculates the terminal voltage of the motor by equation below：
Wherein, VanIt is the terminal voltage of the A phase terminals of motor；VbnIt is the terminal voltage of the B phase terminals of motor；VcnIt is the C of motor
The terminal voltage of phase terminal；Vintegral1It is the integrated value of first voltage integral unit output；Vintegral2It is that second voltage integration is single
The integrated value of member output；Vintegral3It is the integrated value of tertiary voltage integral unit output；k1It is the step-down ratio of the first pressure unit
Example；k2It is the decompression ratio of the second pressure unit；k3It is the decompression ratio of the 3rd pressure unit；TpwmIt is PWM voltage drive signals
Cycle.
Preferably, the terminal voltage measurement apparatus also includes：
Integral reset module, for being resetted to the voltage integrating meter module.
Second aspect of the present invention provides a kind of terminal voltage measuring method of motor, the motor and motor drive module phase
Even, the motor drive module is used to export PWM voltage drive signals to the motor to drive the motor operation, the end
Voltage measurement method includes：
Calculate integrated value of the PWM voltage drive signals in a PWM cycle；
The terminal voltage of motor according to the computation of Period of the integrated value and the PWM voltage drive signals.
Preferably, the motor is three phase electric machine, and the motor drive module is three-phase inverter, the three phase electric machine
Three-phase terminal is connected respectively the three-phase output end of described three-phase inverter.
Preferably, methods described also includes：Calculate integrated value of the PWM voltage drive signals in a PWM cycle it
Before, the PWM voltage drive signals are reduced to predetermined amplitude.
Preferably, the terminal voltage of the motor is calculated by equation below：
Wherein, VanIt is the terminal voltage of the A phase terminals of motor；VbnIt is the terminal voltage of the B phase terminals of motor；VcnIt is the C of motor
The terminal voltage of phase terminal；k1It is the decompression ratio of the PWM voltage drive signals of the first output end of three-phase inverter；k2It is three-phase
The decompression ratio of the PWM voltage drive signals of second output end of inverter；k3It is the PWM of the 3rd output end of three-phase inverter
The decompression ratio of voltage drive signals；Vintegral1It is the PWM of the first output end of the three-phase inverter for being reduced to predetermined amplitude
Integrated value of the voltage drive signals in a PWM cycle；Vintegral2It is the of the three-phase inverter for being reduced to predetermined amplitude
Integrated value of the PWM voltage drive signals of two output ends in a PWM cycle；Vintegral3It is reduced to predetermined amplitude
Integrated value of the PWM voltage drive signals of 3rd output end of three-phase inverter in a PWM cycle；TpwmIt is that PWM voltages drive
The cycle of dynamic signal.
Technical scheme provided by the invention has the advantages that：
The present invention is integrated by the PWM voltage drive signals exported to motor drive module, to obtain the PWM voltages
Integrated value of the drive signal in a PWM cycle, is then calculated according to the cycle of the integrated value and PWM voltage drive signals
The terminal voltage of motor, because PWM voltage drive signals are obtained from the outlet side of motor drive module, motor drive is taken into full account
The loss of voltage that the non-linear factor of dynamic model block is brought, so as to it is more efficient exactly obtain motor terminal voltage, favorably
In the large-area applications for promoting position-sensor-free technology.
Brief description of the drawings
Fig. 1 is the structured flowchart of the terminal voltage measurement apparatus for the motor that one embodiment of the invention provides；
Fig. 2 is the circuit theory diagrams of the terminal voltage measurement apparatus for the motor that another embodiment of the present invention provides；
Fig. 3 is the integration and reset timing figure of voltage integrating meter module provided in an embodiment of the present invention；
Fig. 4 is the structured flowchart of electric machine control system provided in an embodiment of the present invention.
Description of reference numerals
1- motor 2- three-phase inverters
10- voltage reduction module 20- voltage integrating meter modules
30- terminal voltage computing module 40- integral reset modules
100- motor terminal voltage measurement apparatus 200- electric machine control systems
101- the first pressure unit the second pressure units of 102-
The pressure unit 201- first voltage integral units of 103- the 3rd
202- second voltage integral unit 203- tertiary voltage integral units
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Refering to Fig. 1, first aspect of the embodiment of the present invention provides a kind of terminal voltage measurement apparatus 100 of motor 1, the motor
1 input is connected with the output end of motor drive module, the input termination both positive and negative polarity bus of the motor drive module, motor
The voltage signal VDC that both positive and negative polarity bus inputs can be converted into being delivered to motor 1 after PWM voltage drive signals by drive module
Input, so as to which motor 1 is run.
The terminal voltage measurement apparatus 100 includes voltage integrating meter module 20 and terminal voltage computing module 30；Wherein, voltage accumulates
The input of sub-module 20 is connected with the output end of motor drive module, its output end and the input of terminal voltage computing module 30
It is connected, for calculating integrated value of the PWM voltage drive signals of motor drive module output in a PWM cycle, and will meter
Obtained integrated value is exported to terminal voltage computing module 30, by terminal voltage computing module 30 according to the integrated value and PWM voltages
The terminal voltage of the computation of Period motor 1 of drive signal.Wherein, the terminal voltage of the motor 1 refers to each input terminal of motor 1
Voltage-to-ground or the voltage to negative electrode bus.
The motor 11 for example can be monophase machine 1 or three phase electric machine 1, and the present embodiment will enter by taking three phase electric machine 1 as an example
Row explanation.
As shown in figure 1, the motor 1 is three phase electric machine 1, the motor drive module is three-phase inverter 2.Three-phase inversion
Device 2 has three-phase output end, and its first output end is connected with the A phase terminals of motor 1, the second output end and the B phase terminals of motor 1
It is connected, the 3rd output end is connected with the C phase terminals of motor 1；This three-phase output end exports three road PWM voltage drive signals extremely respectively
Corresponding motor terminal；The cycle phase of three road PWM voltage drive signals is same, is the switch periods of inverter, three road PWM voltages
The voltage magnitude of drive signal is general.
The PWM voltage drive signals that the present embodiment is exported by voltage integrating meter module 20 to three-phase inverter 2 integrate,
Voltage integrating meter module 20 can be for example the commercial integrator with enabled and reseting interface, and commercial integrator structure is simple, holds
Easily realize, available for engineering practice.
Generally, the size for the maximum input voltage that voltage integrating meter module 20 can be born is limited, in order to avoid defeated
The input voltage entered to voltage integrating meter module 20 is excessive, more than the carrying voltage of voltage integrating meter module 20, causes voltage integrating meter mould
The function of block 20 is damaged, and in a preferred embodiment, the terminal voltage measurement apparatus also includes voltage reduction module 10, the voltage integrating meter
The input of module 20 is connected by the voltage reduction module 10 with the output end of the motor drive module, i.e. the decompression mould
The input of block 10 is connected with the output end of motor drive module, and its output end is connected with the input of voltage integrating meter module 20,
For before the voltage integrating meter module calculates integrated value of the PWM voltage drive signals in a PWM cycle, by the PWM
Voltage drive signals are exported to voltage integrating meter module 20 after being reduced to predetermined amplitude, wherein, the PWM voltage drive signals are
The PWM voltage drive signals of motor drive module output.
Refering to Fig. 2, for three phase electric machine 1, three-phase inverter 2 exports the PWM voltage drive signals for having three tunnels, because
This is, it is necessary to which the PWM voltage drive signals on the tunnels of Dui Zhe tri- carry out decompression processing respectively, therefore, the voltage reduction module 10 includes first
Pressure unit 101, the second pressure unit 102 and the 3rd pressure unit 103；Wherein, the input of the first pressure unit 101 and electricity
The A phase terminals (i.e. the first output end of three-phase inverter 2) of machine 1 are connected, for by the first output end of three-phase inverter 2
PWM voltage drive signals are reduced to predetermined amplitude；The input of second pressure unit 102 and the B phase terminals (i.e. three of motor 1
Second output end of phase inverter 2) it is connected, for the PWM voltage drive signals of the second output end of three-phase inverter 2 to be reduced
To predetermined amplitude；C phase terminals (i.e. the 3rd output of three-phase inverter 2 of the input of 3rd pressure unit 103 and motor 1
End) it is connected, for the PWM voltage drive signals of the 3rd output end of three-phase inverter 2 to be reduced into predetermined amplitude.Need
Bright, above-mentioned first pressure unit 101, the second pressure unit 102 and the 3rd pressure unit 103 are only to corresponding PWM voltages
The amplitude of drive signal is limited, and does not change the phase of PWM voltage drive signals.
Corresponding with the structure of above-mentioned voltage reduction module 10 with continued reference to Fig. 2, voltage integrating meter module 20 is accumulated including first voltage
Subdivision 201, second voltage integral unit 202 and tertiary voltage integral unit 203, wherein, first voltage integral unit 201
Input is connected with the output end of the first pressure unit 101, is reduced to make a reservation for for calculating the first pressure unit 101 output
Integrated value of the PWM voltage drive signals of amplitude in a PWM cycle；The input of second voltage integral unit 202 and
The output end of two pressure units 102 is connected, for calculating the PWM for being reduced to predetermined amplitude of the second pressure unit 102 output
Integrated value of the voltage drive signals in a PWM cycle；The input of tertiary voltage integral unit 203 and the 3rd voltage reduction module
10 output end is connected, for calculating the PWM voltage drive signals for being reduced to predetermined amplitude of the 3rd pressure unit 103 output
Integrated value in a PWM cycle.
With continued reference to Fig. 2, in one embodiment, the first pressure unit 101, the second pressure unit 102 and the 3rd drop
Each unit in pressure unit 103 includes first resistor unit R 1 and second resistance unit R 2；Wherein, the first pressure unit
One end of 101 first resistor unit R 1 is connected with the A phase terminals of motor 1, the second electricity of the other end and the first pressure unit 101
Hinder one end of unit R 2 and the input of first voltage integral unit 201 is connected, the second resistance list of the first pressure unit 101
First R2 other end ground connection；One end of the first resistor unit R 1 of second pressure unit 102 is connected with the B phase terminals of motor 1, separately
One end and one end of the second resistance unit R 2 of the second pressure unit 102 and the input phase of second voltage integral unit 202
Even, the other end ground connection of the second resistance unit R 2 of the second pressure unit 102；The first resistor unit of 3rd pressure unit 103
R1 one end is connected with the C phase terminals of motor 1, one end of the second resistance unit R 2 of the other end and the 3rd pressure unit 103 and
The input of tertiary voltage integral unit 203 is connected.
By the antihypertensive effect of above-mentioned pressure unit, the amplitude V1 of original PWM voltage drive signals can be reduced toWherein R2 is the resistance of second resistance unit R 2, and R1 is the resistance of first resistor unit R 1, passes through regulation the
One resistance unit R1 and second resistance unit R 2 resistance, thus it is possible to vary Amplitude of Hypotensive.
Terminal voltage computing module 30 receives first voltage integral unit 201, second voltage integral unit 202 and tertiary voltage
The three tunnel integrated values that integral unit 203 exports, and respectively according to this three tunnels integrated value and the step-down ratio of corresponding pressure unit
The terminal voltage of the three-phase terminal of motor 1 is calculated in the cycle of example and PWM voltage drive signals.
Specifically, terminal voltage computing module 30 calculates the terminal voltage of the three-phase terminal of motor 1 by equation below：
Wherein, VanIt is the terminal voltage of the A phase terminals of motor 1；VbnIt is the terminal voltage of the B phase terminals of motor 1；VcnIt is motor 1
C phase terminals terminal voltage；Vintegral1It is the integrated value that first voltage integral unit 201 exports；Vintegral2It is second voltage
The integrated value that integral unit 202 exports；Vintegral3It is the integrated value that tertiary voltage integral unit 203 exports；k1It is the first decompression
The decompression ratio of unit 101；k2It is the decompression ratio of the second pressure unit 102；k3It is the decompression ratio of the 3rd pressure unit 103；
TpwmIt is the cycle of PWM voltage drive signals.
Refering to Fig. 2, according to the decompression principle of reduction voltage circuit, the decompression ratio k of the first pressure unit 1011, the second decompression it is single
The decompression ratio k of member 1022With the decompression ratio k of the 3rd pressure unit 1033It is equal toWherein R2 is second resistance list
First R2 resistance, R1 are the resistance of first resistor unit R 1.
After the terminal voltage of three-phase terminal of motor 1 has been calculated by above-mentioned formula, it can also further pass through following public affairs
Formula calculates the phase voltage of the three-phase terminal of motor 1：
Wherein, VapFor the phase voltage of the A phase terminals of motor 1；VbpFor the phase voltage of the B phase terminals of motor 1；VcpFor motor 1
C phase terminals phase voltage.
Specifically, so that motor 1 is three phase electric machine 1 as an example, the terminal voltage of the three-phase terminal of motor 1 is respectively three-phase terminal
Voltage-to-ground, the neutral point of three phase electric machine 1 is designated as P, and the neutral point voltage-to-ground of three phase electric machine 1 is designated as Vpn, then three-phase
The terminal voltage of terminal meets following relation with phase voltage：
In 1 normal work of motor, the three-phase voltage balance of motor 1, i.e.,：
Vap+Vbp+Vcp=0 (2)
It can be obtained according to formula (1) and formula (2)：
The calculation formula of phase voltage that formula (3) is brought into the three-phase terminal that formula (1) can obtain motor 1 is：
According to the impulse equivalency principle of vector controlled, as shown in figure 3, Van, Vbn, VcnAverage value in a PWM cycle
Equal to its integrated value divided by PWM cycle to the time.With terminal voltage VanExemplified by, VanAverage value in a PWM cycle
VaverageCalculation formula be：
According to the principle shown in formula (5), due to the integrated value that in the present embodiment, first voltage integral unit is calculated
To be reduced to integrated value of the PWM voltage drive signals of predetermined amplitude in a PWM cycle, decompression ratio is k1, first
The integrated value that voltage integrating meter unit is calculatedThat is,
By the V in above-mentioned formula (5)averageReplaced with terminal voltage, and bring formula (6) into formula (5), it is possible to obtained
The calculation formula of the terminal voltage of the A phase terminals of motor 1 is：
The terminal voltage calculation formula of the B phase terminals and C phase terminals that similarly obtain motor 1 is respectively：
The present embodiment calculates the terminal voltage for obtaining motor 1 using the method for integration, can be by busbar voltage VDC at one
The pressure drop of power device takes into account in voltage pulsation and inverter in PWM cycle, improves computation model middle-end electricity
The precision of pressure, when effectively avoiding open loop estimation terminal voltage, when especially electric current is smaller, due to being missed caused by dead band and delay
Difference.
In a preferred embodiment, the terminal voltage measurement apparatus 100 also includes integral reset module 40, the integral reset
Module 40 is connected with voltage integrating meter module 20, is needed after each integration is completed and samples reading integrated value to voltage integrating meter unit
Reset zero is carried out, thinks that the integration of next PWM cycle is prepared.Integral reset module 40 can be made up of analog switch or
The reset unit of person's integrator integrated circuit is formed.Typically carried out as shown in figure 3, resetting when terminal voltage is low level.
Second aspect of the embodiment of the present invention provides a kind of terminal voltage measuring method of motor 1, and the motor 1 drives with motor
Module is connected, and the motor drive module is used to export PWM voltage drive signals to the motor 1 to drive the motor 1 to transport
OK, the terminal voltage measuring method includes：
Step 1, integrated value of the PWM voltage drive signals in a PWM cycle is calculated；
Step 2, according to the computation of Period of the integrated value and the PWM voltage drive signals motor 1 terminal voltage.
As shown in figure 1, the motor 1 is three phase electric machine 1, the motor drive module is three-phase inverter 2, the three-phase
The three-phase terminal of motor 1 is connected respectively the three-phase output end of described three-phase inverter 2.
Wherein, in above-mentioned steps 1, integration of the PWM voltage drive signals in a PWM cycle can be calculated by integrator
Value.Generally, the maximum input voltage that integrator can be born is limited, in order to avoid inputting to the PWM voltages of integrator
The amplitude of drive signal is excessive, more than the carrying voltage of integrator, causes integrator function to be damaged, in a preferred embodiment,
The PWM voltage drive signals can be reduced to before integrated value of the PWM voltage drive signals in a PWM cycle is calculated
Predetermined amplitude, then calculate integrated value of the PWM voltage drive signals for being reduced to predetermined amplitude in a PWM cycle.
Further, the terminal voltage of the motor 1 can be calculated by equation below：
Wherein, VanIt is the terminal voltage of the A phase terminals of motor 1；VbnIt is the terminal voltage of the B phase terminals of motor 1；VcnIt is motor 1
C phase terminals terminal voltage；k1It is the decompression ratio of the PWM voltage drive signals of the first output end of three-phase inverter 2；k2It is
The decompression ratio of the PWM voltage drive signals of second output end of three-phase inverter 2；k3It is the 3rd output of three-phase inverter 2
The decompression ratio of the PWM voltage drive signals at end；Vintegral1It is the first defeated of the three-phase inverter 2 for being reduced to predetermined amplitude
Go out integrated value of the PWM voltage drive signals at end in a PWM cycle；Vintegral2It is the three-phase for being reduced to predetermined amplitude
Integrated value of the PWM voltage drive signals of second output end of inverter 2 in a PWM cycle；Vintegral3It is to be reduced to
Integrated value of the PWM voltage drive signals of 3rd output end of the three-phase inverter 2 of predetermined amplitude in a PWM cycle；Tpwm
It is the cycle of PWM voltage drive signals.
Refering to Fig. 4, the embodiment of the present invention also provides a kind of electric machine control system 200, and the electric machine control system 200 includes root
According to the terminal voltage measurement apparatus 100 of the motor 1 described in first aspect of the embodiment of the present invention.Due to electricity provided in an embodiment of the present invention
The terminal voltage measurement apparatus 100 of machine 1 has beneficial effect as described above, therefore, motor control provided in an embodiment of the present invention
System 200 has more excellent control performance.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited thereto.At this
In the range of the technology design of invention, a variety of simple variants can be carried out to technical scheme.Including each particular technique
Feature is combined in any suitable manner.In order to avoid unnecessary repetition, the present invention is to various combinations of possible ways
No longer separately illustrate.But these simple variants and combination should equally be considered as content disclosed in this invention, belong to the present invention
Protection domain.
Claims (12)
1. the terminal voltage measurement apparatus of a kind of motor, it is characterised in that the motor is connected with motor drive module, the motor
Drive module is used to export PWM voltage drive signals to the motor to drive the motor operation, the terminal voltage measurement dress
Put including：
Voltage integrating meter module, for calculating integrated value of the PWM voltage drive signals in a PWM cycle；And
Terminal voltage computing module, for the motor according to the computation of Period of the integrated value and the PWM voltage drive signals
Terminal voltage.
2. terminal voltage measurement apparatus according to claim 1, it is characterised in that the motor is three phase electric machine, the electricity
Machine drive module is three-phase inverter, and the three-phase terminal of the three phase electric machine is connected respectively the three of described three-phase inverter
Phase output terminal.
3. terminal voltage measurement apparatus according to claim 2, it is characterised in that the terminal voltage measurement apparatus also includes：
Voltage reduction module, for calculating integrated value of the PWM voltage drive signals in a PWM cycle in the voltage integrating meter module
Before, the PWM voltage drive signals are reduced to predetermined amplitude.
4. the terminal voltage measurement apparatus of motor according to claim 3, it is characterised in that the voltage reduction module includes：
First pressure unit, it is predetermined for the PWM voltage drive signals of the first output end of the three-phase inverter to be reduced to
Amplitude；
Second pressure unit, it is predetermined for the PWM voltage drive signals of the second output end of the three-phase inverter to be reduced to
Amplitude；
3rd pressure unit, it is predetermined for the PWM voltage drive signals of the 3rd output end of the three-phase inverter to be reduced to
Amplitude.
5. the terminal voltage measurement apparatus of motor according to claim 4, it is characterised in that the voltage integrating meter module bag
Include：
First voltage integral unit, for calculating the PWM voltages for being reduced to predetermined amplitude of the first pressure unit output
Integrated value of the drive signal in a PWM cycle；
Second voltage integral unit, for calculating the PWM voltages for being reduced to predetermined amplitude of the second pressure unit output
Integrated value of the drive signal in a PWM cycle；
Tertiary voltage integral unit, for calculating the PWM voltages for being reduced to predetermined amplitude of the 3rd pressure unit output
Integrated value of the drive signal in a PWM cycle.
6. the terminal voltage measurement apparatus of motor according to claim 5, it is characterised in that first pressure unit, institute
Each unit stated in the second pressure unit and the 3rd pressure unit includes first resistor unit and second resistance list
Member, wherein, one end of the first resistor unit is connected with corresponding motor terminal, and the other end connects the second resistance unit
One end, the second resistance unit the other end ground connection；First pressure unit, second pressure unit and described
It is single that the first resistor unit of three pressure units and the common port of second resistance unit are connected respectively the first voltage integration
Input, the input of the second voltage integral unit and the input of the tertiary voltage integral unit of member.
7. the terminal voltage measurement apparatus for the motor stated according to claim 5 or 6, it is characterised in that the terminal voltage computing module
The terminal voltage of the motor is calculated by equation below：
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Wherein, VanIt is the terminal voltage of the A phase terminals of motor；VbnIt is the terminal voltage of the B phase terminals of motor；VcnIt is that the C phases of motor are held
The terminal voltage of son；Vintegral1It is the integrated value of first voltage integral unit output；Vintegral2It is that second voltage integral unit is defeated
The integrated value gone out；Vintegral3It is the integrated value of tertiary voltage integral unit output；k1It is the decompression ratio of the first pressure unit；k2
It is the decompression ratio of the second pressure unit；k3It is the decompression ratio of the 3rd pressure unit；TpwmIt is the week of PWM voltage drive signals
Phase.
8. the terminal voltage measurement apparatus of the motor according to any one in claim 1-6, it is characterised in that the end electricity
Pressure measuring device also includes：
Integral reset module, for being resetted to the voltage integrating meter module.
9. the terminal voltage measuring method of a kind of motor, it is characterised in that the motor is connected with motor drive module, the motor
Drive module is used to export PWM voltage drive signals to the motor to drive the motor operation, the terminal voltage measurement side
Method includes：
Calculate integrated value of the PWM voltage drive signals in a PWM cycle；
The terminal voltage of motor according to the computation of Period of the integrated value and the PWM voltage drive signals.
10. the terminal voltage measuring method of motor according to claim 9, it is characterised in that the motor is three phase electric machine,
The motor drive module is three-phase inverter, and the three-phase terminal of the three phase electric machine is connected respectively described three-phase inversion
The three-phase output end of device.
11. the terminal voltage measuring method of motor according to claim 10, it is characterised in that methods described also includes：
Before calculating integrated value of the PWM voltage drive signals in a PWM cycle, the PWM voltage drive signals are reduced to predetermined
Amplitude.
12. the terminal voltage measuring method of motor according to claim 11, it is characterised in that institute is calculated by equation below
State the terminal voltage of motor：
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>a</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>int</mi>
<mi>e</mi>
<mi>g</mi>
<mi>r</mi>
<mi>a</mi>
<mi>l</mi>
<mn>1</mn>
</mrow>
</msub>
<mrow>
<msub>
<mi>k</mi>
<mn>1</mn>
</msub>
<mo>&times;</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>p</mi>
<mi>w</mi>
<mi>m</mi>
</mrow>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>b</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>int</mi>
<mi>e</mi>
<mi>g</mi>
<mi>r</mi>
<mi>a</mi>
<mi>l</mi>
<mn>2</mn>
</mrow>
</msub>
<mrow>
<msub>
<mi>k</mi>
<mn>2</mn>
</msub>
<mo>&times;</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>p</mi>
<mi>w</mi>
<mi>m</mi>
</mrow>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>c</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>int</mi>
<mi>e</mi>
<mi>g</mi>
<mi>r</mi>
<mi>a</mi>
<mi>l</mi>
<mn>3</mn>
</mrow>
</msub>
<mrow>
<msub>
<mi>k</mi>
<mn>3</mn>
</msub>
<mo>&times;</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>p</mi>
<mi>w</mi>
<mi>m</mi>
</mrow>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, VanIt is the terminal voltage of the A phase terminals of motor；VbnIt is the terminal voltage of the B phase terminals of motor；VcnIt is that the C phases of motor are held
The terminal voltage of son；k1It is the decompression ratio of the PWM voltage drive signals of the first output end of three-phase inverter；k2It is three-phase inversion
The decompression ratio of the PWM voltage drive signals of second output end of device；k3It is the PWM voltages of the 3rd output end of three-phase inverter
The decompression ratio of drive signal；Vintegral1It is the PWM voltages of the first output end of the three-phase inverter for being reduced to predetermined amplitude
Integrated value of the drive signal in a PWM cycle；Vintegral2It is the second defeated of the three-phase inverter for being reduced to predetermined amplitude
Go out integrated value of the PWM voltage drive signals at end in a PWM cycle；Vintegral3It is the three-phase for being reduced to predetermined amplitude
Integrated value of the PWM voltage drive signals of 3rd output end of inverter in a PWM cycle；TpwmIt is PWM voltages driving letter
Number cycle.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777557A (en) * | 2018-06-14 | 2018-11-09 | 广东威灵电机制造有限公司 | The measurement method and device of motor terminal voltage |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1142705A (en) * | 1995-02-23 | 1997-02-12 | 松下电工株式会社 | Power supply apparatus |
| CN103713185A (en) * | 2013-12-25 | 2014-04-09 | 吉林大学 | Motor terminal voltage measuring instrument of alternating current frequency conversion motor |
| CN106452225A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Real-time correction system and method for commutation phase of sensorless brushless DC motor |
-
2017
- 2017-09-30 CN CN201710914675.0A patent/CN107565873A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1142705A (en) * | 1995-02-23 | 1997-02-12 | 松下电工株式会社 | Power supply apparatus |
| CN103713185A (en) * | 2013-12-25 | 2014-04-09 | 吉林大学 | Motor terminal voltage measuring instrument of alternating current frequency conversion motor |
| CN106452225A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Real-time correction system and method for commutation phase of sensorless brushless DC motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777557A (en) * | 2018-06-14 | 2018-11-09 | 广东威灵电机制造有限公司 | The measurement method and device of motor terminal voltage |
| CN108777557B (en) * | 2018-06-14 | 2021-03-16 | 广东威灵电机制造有限公司 | Method and device for measuring terminal voltage of motor |
| 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 |
| CN110716082B (en) * | 2019-09-24 | 2021-11-02 | 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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