CN106787797A - A kind of frequency changer circuit of permagnetic synchronous motor - Google Patents
A kind of frequency changer circuit of permagnetic synchronous motor Download PDFInfo
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- CN106787797A CN106787797A CN201611203072.1A CN201611203072A CN106787797A CN 106787797 A CN106787797 A CN 106787797A CN 201611203072 A CN201611203072 A CN 201611203072A CN 106787797 A CN106787797 A CN 106787797A
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- 238000001914 filtration Methods 0.000 claims description 2
- 230000004075 alteration Effects 0.000 abstract description 3
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of frequency changer circuit of permagnetic synchronous motor, it is therefore intended that harmonic content is higher in solving the problems, such as stator current, is characterized in that：Including three Inductors, three-phase bridge PWM rectification units, electric capacity C1, three-phase bridge PWM inversion units and CLC filter units, three-phase bridge PWM rectification units and three-phase bridge PWM inversion units include six igbts, each igbt is in parallel with a diode reverse respectively, one end of three Inductors is connected with three phase mains, the other end is connected with one end of three-phase bridge PWM rectification units, the other end of three-phase bridge PWM rectification units is connected by electric capacity C1 with one end of three-phase bridge PWM inversion units, the other end of three-phase bridge PWM inversion units is connected with one end of CLC filter units, the other end connection permagnetic synchronous motor of CLC filter units.The achievable regenerative braking of the present invention, makes ac output current close to sine wave, can reduce stator current aberration rate, improves permanent magnet synchronous motor control performance.
Description
Technical field：
The present invention relates to a kind of frequency changer circuit of permagnetic synchronous motor, belong to Motor Control Field.
Background technology：
High-speed permanent magnet motor is generally powered using high frequency, non-sine PWM inverter, and frequency is up to several KHzs to tens of thousands of hertz
Hereby, from design feature and the running status requirement of high-speed permanent magnetic synchronous motor, the stator inductance of high-speed permanent magnetic synchronous motor
Very little, usually less than 0.5mH.From for favourable one side, small inductor characteristic is beneficial to the dynamic response speed for improving stator current
Degree, but this characteristic can also bring many adverse effects to electric machine control system.It is the three-phase of few kilohertz to use switching frequency
It is right therefore, it is difficult to realize due to motor stator inductance very little when voltage source PWM inverter is directly driven to this type motor
Effective regulation of winding current, this will cause winding current to be distorted, and very big harmonic components be contained in electric current, so as to can increase
Plus winding copper loss and core loss, while can also produce larger torque pulsation and noise.In order to reduce the electricity of frequency converter output
Harmonic content in stream, so as to the control to high-speed permanent magnetic synchronous motor is better achieved, usual way is exactly in frequency converter
Output end seal in three identical inductance being of moderate size, permanent-magnetic synchronous motor stator equivalent inductance is become big, so as to leach
Current component beyond fundamental wave.But the output end of frequency converter install additional filter inductance can make the volume of whole system, weight and
Cost increase at double, simultaneously because inductance plays hysteresis to electric current, this can undoubtedly reduce the dynamic response of armature supply again
Speed.Another method is the control frequency by improving switching tube, to realize the purpose to stator current quick regulation.So
And the switching frequency of switching tube can not unrestrictedly increase, it is also limited by system power, it is therefore desirable to permanent-magnet synchronous
The frequency changer circuit of motor is improved.
The content of the invention：
The invention provides a kind of frequency changer circuit of permagnetic synchronous motor, it is therefore intended that solve existing permagnetic synchronous motor and determine
Harmonic content problem higher in electron current, it can realize regenerative braking, make ac output current close to sine wave, can reduce
Stator current aberration rate, and then improve permanent magnet synchronous motor control performance.
The frequency changer circuit of permagnetic synchronous motor of the invention, the technical scheme used to reach above-mentioned purpose is：Including
Three Inductors, three-phase bridge PWM rectification units, electric capacity C1, three-phase bridge PWM inversion units and CLC filter units, institute
Three Inductors are stated including three inductance L1, three inductance L1 with access circuit in the form of connecting；The three-phase bridge
PWM rectification units and three-phase bridge PWM inversion units include six igbts, each insulated gate bipolar transistor
Pipe is in parallel with a diode reverse respectively, and one end of three Inductors is connected with three phase mains, the other end and three
One end of phase bridge-type PWM rectification units is connected, and the other end of three-phase bridge PWM rectification units passes through electric capacity C1 and three-phase bridge
One end of PWM inversion units is connected, and the other end of three-phase bridge PWM inversion units is connected with one end of CLC filter units, CLC
The other end connection permagnetic synchronous motor of filter unit.
As a further improvement on the present invention, the CLC filter units include the first filter unit, three inductance L4 and the
Two filter units, the input of described the first filter unit output end, inductance L4 respectively with three-phase bridge PWM inversion units
One end be connected, described the second filter unit other end respectively with inductance L4, the input of permagnetic synchronous motor are connected.It is logical
Crossing the first filter unit can effectively absorb the harmonic wave of 5 to 7 times in three-phase bridge PWM inversion unit electric currents, by the second filter
Ripple unit can effectively absorb the high-frequency harmonic of more than 7 times in electric current.
As a further improvement on the present invention, first filter unit include three electric capacity C2, three electric capacity C3, three
Inductance L2 and three inductance L3, three one end of electric capacity C2 output end, inductance L4 respectively with three-phase bridge PWM inversion units 3
One end be connected, the one end of the other end respectively with three inductance L2 is connected, three other ends of inductance L2 respectively with electric capacity C3 and
One end of inductance L3 is connected, and the other end of inductance L3 and the other end of electric capacity C3 are connected with earth terminal.
As a further improvement on the present invention, second filter unit includes three electric capacity C4, three inductance L5 and three
Individual resistance R1, three one end of electric capacity C4 other end respectively with inductance L4, the input of permagnetic synchronous motor are connected, the other end
The one end with three one end of inductance L5, three resistance R1 is connected respectively, three other ends of inductance L5, three resistance R1 it is another
One end is connected with earth terminal.
As a further improvement on the present invention, the diode is backward resistance point-contact diode high, its reverse electricity
Resistance is high, and energy-storage travelling wave tube is used together, and the mutation of voltage x current in circuit can be prevented, for inverse electromotive force provides power consumption path.
The beneficial effects of the invention are as follows：The present invention using three-phase bridge PWM rectification circuits replace tradition can not control rectifier,
Any adjunct circuit need not be increased and can be achieved with frequency converter regeneration feedback of the energy to power network, using PWM commutation techniques, it is direct
Each power switch original paper on rectifier bridge is controlled so that input current close to sine wave, its phase and voltage source phase phase
Together.So containing only the higher hamonic wave relevant with switching frequency in input current, these overtone orders are high, easily filter, meanwhile,
Make power factor close to 1, reduce the harm to power network, there is double PWM input voltage, power frequency to fix, and waveform is approximately
Sine, power factor is close to 1, and output voltage power frequency is variable, and the characteristics of current waveform is approximately sine, output current is flowed through
CLC filter units, can effectively suppress the individual harmonic current in addition to fundamental frequency in output current so that flow into permanent magnet synchronous electric
The characteristics of armature supply of machine is sine wave.This frequency converter can realize four quadrant running, it is possible to achieve the two-way flow of energy.
Brief description of the drawings：
Fig. 1 is the frequency changer circuit figure of permagnetic synchronous motor of the invention.
Specific embodiment：
Reference picture 1, the frequency changer circuit of the permagnetic synchronous motor, including three Inductors 1, three-phase bridge PWM rectifications
Unit 2, electric capacity C1, three-phase bridge PWM inversion units 3 and CLC filter units 4, three Inductors 1, three-phase bridge PWM are whole
Stream unit 2, electric capacity C1, three-phase bridge PWM inversion units 3 and CLC filter units 4 are connected using the structure of cascade, described three
One end of Inductor 1 is connected with three phase mains, and the other end is connected with one end of three-phase bridge PWM rectification units 2, three-phase bridge
The other end of formula PWM rectification units 2 is connected by electric capacity C1 with one end of three-phase bridge PWM inversion units 3, three-phase bridge PWM
The other end of inversion unit 3 is connected with one end of CLC filter units 4, the other end connection permanent magnet synchronous electric of CLC filter units 4
Machine, three Inductors 1 include inductance L1, the inductance L1 in accessing circuit in the form of connecting, and it is alternating current
Source internal inductance and external inductance sum, are necessary to circuit normal work, to also function to certain filter action；The three-phase
Bridge-type PWM rectification units 2 include six igbts V1-V6, six igbt V1-V6 point
Not with diode D1-D6 reverse parallel connections, leading to for six igbt V1-V6 is controlled by pwm pulse signal
It is disconnected alternating current to be changed into DC voltage, wherein, the diode is backward resistance point-contact diode high；It is described
Three-phase bridge PWM inversion units 3 include six igbt V7-V12, six igbts
V7-V12 respectively with diode D7-D12 reverse parallel connections, six igbts are controlled by pwm pulse signal
DC voltage on the electric capacity C1 can be changed into three-phase alternating voltage with required frequency by the break-make of V7-V12, wherein,
The diode is backward resistance point-contact diode high.
Further, the CLC filter units 4 include 41, three inductance L4 of the first filter unit and the second filter unit
42, the input of described the first filter unit 41 output end, the one of inductance L4 respectively with three-phase bridge PWM inversion units 3
End is connected, and described the second filter unit 42 other end respectively with inductance L4, the input of permagnetic synchronous motor are connected, and pass through
First filter unit 40 can effectively absorb the 5-7 subharmonic in the electric current of three-phase bridge PWM inversion units 3；Described second
41 points of filter unit can effectively absorb the high-frequency harmonic of more than 7 times in electric current, by 41 points described of the second filter unit
The high-frequency harmonic of more than 7 times in electric current can effectively be absorbed.
Further, first filter unit 41 includes three electric capacity C2, three electric capacity C3, three inductance L2 and three
Inductance L3, three one end of electric capacity C2 output end respectively with three-phase bridge PWM inversion units 3, one end of inductance L4 are connected, separately
The one end of one end respectively with three inductance L2 is connected, three other ends of inductance L2 respectively with one end phase of electric capacity C3 and inductance L3
Even, the other end of inductance L3 and the other end of electric capacity C3 are connected with earth terminal；Second filter unit 42 includes three electricity
Hold C4, three inductance L5 and three resistance R1, three one end of the electric capacity C4 other end, permagnetic synchronous motor respectively with inductance L4
Input be connected, the one end of the other end respectively with three one end of inductance L5, three resistance R1 is connected, and three inductance L5's is another
One end, the other end of three resistance R1 are connected with earth terminal.
When pwm pulse controls the break-make of igbt, the rate of change of voltage, electric current during HF switch
Very big, so that the very strong electromagnetic interference of forming frequency, this can be impacted to the normal operation of magneto, reduce system
Reliability.In switch converters, the size of ripple depends on the harmonic current in circuit, in order to the electric current for suppressing switching frequency is humorous
Ripple, improves the reliability of frequency converter, it is necessary to filter the harmonic wave beyond fundamental frequency using output filter.Because CLC wave filters are compared
Traditional L and LC wave filters have stronger rejection ability to electric current high fdrequency component, therefore make high frequency attenuation using CLC wave filters
Enhancing, while suppressing switching harmonics.But design CLC wave filters are, it is necessary to take into full account that resonant frequency, cut-off frequency, inductance are total
The condition such as impedance voltage drop, if component parameters design is unreasonable, expected filter effect is not reached not only, or even electric current can be made
Distortion is produced, so as to influence the performance of system.
The impedance expression of first filter unit 40 is：Its
In, ω is the angular frequency of any harmonic wave, L2、L3It is the inductance of the first filter unit, C2、C3It is the electric capacity of the first filter unit.
It is 0 in the impedance of tuned frequency point, therefore deduces that its tuned frequency respectively ωk1、ωk2, wherein, k1,
K2 is the number of times of each tuned frequency harmonic wave.In output current fundamental frequency ω1Under, the reactive power that the first filter unit sends is
Q, if U is fundamental wave rated voltage, then each component parameters of the first filter unit are：
Wherein, ω1It is fundamental frequency, k1, k2 are the number of times of each tuned frequency harmonic wave
The impedance expression of second filter unit 41 is：Wherein, ω is
The angular frequency of any harmonic wave, R1It is the inductance of the second filter unit, L5It is the inductance of the second filter unit, C4For the second filtering is single
The electric capacity of unit.
Because the second filter unit is high-pass filter, its characteristic can be described by following characteristic：
In formula, f0It is cut-off frequency, the cut-off frequency of high-pass filter is typically slightly above installed double-tuned filter
Highest tuned frequency.M is a parameter related to quality factor, directly affects the shape of filter unit tuning curve.One
As m value between 0.5~2.
Electric capacity C4Determination need to consider the condition such as voltage conditions, current condition, capacity conditions of electric capacity.Electric capacity C4Take
It is worth and is：Wherein PnIt is the rated capacity of compensation device, UnIt is the rated voltage of compensation device, N electric capacity is idle institute
Account for the ratio of specified compensation capacity, generally no greater than 10%.
C4Value determine after, then
In formula, f0It is cut-off frequency, ω1It is fundamental frequency.
When determining the parameter of inductance L4, first have to consider pressure drop of the fundamental wave on inductance, generally three-phase bridge PWM inversions
The 3%-5% of unit output rated voltage, its secondary influence for taking into full account harmonic current, harmonic current is about inverter current
The 10%-20% of capacity, finally considers the attenuation multiple index of interference harmonic frequency to be filtered.The span of L4 can be obtained
For：
In formula：UdcIt is electric capacity C1 both end voltages, fsw is the frequency of three-phase bridge PWM inversion unit switching tubes, iwIt is ripple
Electric current.
During work, first pass through rectifier and three-phase alternating current is transformed into direct current, then changed direct current by inverter
Into alternating current.The amplitude and frequency of the alternating current of frequency converter output can adjust.Rectification link constitutes three-phase bridge by 6 IGCTs
Formula controlled rectification circuit, uses device Commutation, and circulation is carried out using the self-switching-off capability of wholly-controled device.This 6 brilliant locks
The turn-on sequence of pipe is (V1, V2)-(V2, V3)-(V3, V4)-(V4, V5)-(V5, V6)-(V6, V1), the effect of rectification circuit
It is that three-phase alternating current is rectified into the adjustable DC voltage of amplitude, the regulation of amplitude is by adjusting the big of the pilot angle of IGCT
Small come what is realized, pilot angle is smaller, and its amplitude is bigger.DC link reality DC side bulky capacitor C1, can filter high-frequency harmonic,
Make the waveform of DC voltage more straight, because in DC link and connecing bulky capacitor, this frequency converter belongs to voltage-type change
Frequency device.Inversion link constitutes three-phase inverter bridge circuit by V7-V12, is also adopted by device Commutation mode, and inverter circuit is by direct current
Voltage is reverse into the three-phase alternating current of frequency-adjustable.The three-phase alternating current of inverter output flows through CLC filter circuits and drives at a high speed
Permagnetic synchronous motor is operated, and due to containing a large amount of higher hamonic waves in electric current, CLC wave filters are to the harmonic high frequency wavelength-division in output current
Measurer has very strong rejection ability, so as to reduce torque pulsation and noise.
A kind of frequency changer circuit of permagnetic synchronous motor of this specific embodiment can realize regenerative braking, its exchange output
Electric current can largely reduce stator current aberration rate close to sine wave, and then it is same to greatly enhance permanent magnetism
Step motor control performance.
Claims (5)
1. a kind of frequency changer circuit of permagnetic synchronous motor, it is characterised in that：Including three Inductors (1), three-phase bridge PWM
Rectification unit (2), electric capacity C1, three-phase bridge PWM inversion units (3) and CLC filter units (4), three Inductors
(1) including three inductance L1, three inductance L1 in accessing circuit in the form of connecting；The three-phase bridge PWM rectification units (2)
Include six igbts with three-phase bridge PWM inversion units, each igbt is respectively with one
Individual diode reverse is in parallel, and one end of three Inductors (1) is connected with three phase mains, the other end and three-phase bridge
One end of PWM rectification units (2) is connected, and the other end of three-phase bridge PWM rectification units (2) passes through electric capacity C1 and three-phase bridge
One end of PWM inversion units (3) is connected, the other end of three-phase bridge PWM inversion units (3) and one end of CLC filter units (4)
It is connected, the other end connection permagnetic synchronous motor of CLC filter units (4).
2. a kind of frequency changer circuit of permagnetic synchronous motor as claimed in claim 1, it is characterised in that：The CLC filter units
(4) including the first filter unit (41), three inductance L4 and the second filter unit (42), described the first filter unit (41)
Input output end respectively with three-phase bridge PWM inversion units (3), one end of inductance L4 are connected, and the second described filtering is single
First (42) other end respectively with inductance L4, the input of permagnetic synchronous motor are connected.
3. a kind of frequency changer circuit of permagnetic synchronous motor as claimed in claim 2, it is characterised in that：First filter unit
(41) including three electric capacity C2, three electric capacity C3, three inductance L2 and three inductance L3, three one end of electric capacity C2 are respectively with three
The output end of phase bridge-type PWM inversion units 3, one end of inductance L4 are connected, and the one end of the other end respectively with three inductance L2 is connected,
The one end of three other ends of inductance L2 respectively with electric capacity C3 and inductance L3 is connected, and the other end of inductance L3 and electric capacity C3's is another
End is connected with earth terminal.
4. a kind of frequency changer circuit of permagnetic synchronous motor as claimed in claim 2, it is characterised in that：Second filter unit
(42) including three electric capacity C4, three inductance L5 and three resistance R1, three one end of electric capacity C4 are another with inductance L4 respectively
End, the input of permagnetic synchronous motor are connected, the other end respectively with three one end of inductance L5, one end phase of three resistance R1
Even, three other ends of inductance L5, the other ends of three resistance R1 are connected with earth terminal.
5. a kind of frequency changer circuit of permagnetic synchronous motor as claimed in claim 1, it is characterised in that：The diode is high anti-
To resistance point-contact diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203072.1A CN106787797A (en) | 2016-12-23 | 2016-12-23 | A kind of frequency changer circuit of permagnetic synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203072.1A CN106787797A (en) | 2016-12-23 | 2016-12-23 | A kind of frequency changer circuit of permagnetic synchronous motor |
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| CN201611203072.1A Pending CN106787797A (en) | 2016-12-23 | 2016-12-23 | A kind of frequency changer circuit of permagnetic synchronous motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880278A (en) * | 2018-08-01 | 2018-11-23 | 山东欧瑞安电气有限公司 | A kind of 1140V permanent magnet direct-driven variable-frequency motor all-in-one machine major loop structure |
| CN113078853A (en) * | 2021-05-14 | 2021-07-06 | 黑龙江瑞鑫永磁电机制造有限公司 | Permanent magnet synchronous motor dragging device improved by induction motor |
-
2016
- 2016-12-23 CN CN201611203072.1A patent/CN106787797A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880278A (en) * | 2018-08-01 | 2018-11-23 | 山东欧瑞安电气有限公司 | A kind of 1140V permanent magnet direct-driven variable-frequency motor all-in-one machine major loop structure |
| CN113078853A (en) * | 2021-05-14 | 2021-07-06 | 黑龙江瑞鑫永磁电机制造有限公司 | Permanent magnet synchronous motor dragging device improved by induction motor |
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Application publication date: 20170531 |