CN107222134B - The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving - Google Patents
The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving Download PDFInfo
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- CN107222134B CN107222134B CN201710472751.7A CN201710472751A CN107222134B CN 107222134 B CN107222134 B CN 107222134B CN 201710472751 A CN201710472751 A CN 201710472751A CN 107222134 B CN107222134 B CN 107222134B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
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Abstract
A kind of brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving: it designs a kind of noninductive DC-DC converter and adds in three-phase voltage source inverter prime, be integrally formed the three-phase voltage source inverter driving circuit of noninductive Boost topology；Analyze effect of the different switching vector selectors to motor input voltage and noninductive DC-DC converter output voltage；When the brshless DC motor operates in the non-commutation stage, according to the effect of switching vector selector design three kinds of normal mode, boost mode and decompression mode operating modes；By selecting three kinds of operating modes, the output voltage of DC-DC converter is adjusted under the premise of guaranteeing that brshless DC motor normally adjusts the speed；When the brshless DC motor operates in the commutation stage, using the commutation torque ripple of fixed two switching vector selectors inhibition brshless DC motor.The volume and cost of drive system is greatly saved in the present invention.The commutation process time can be effectively shortened while inhibiting commutation torque ripple, to improve the reliability of motor operation.
Description
Technical field
The present invention relates to a kind of brshless DC motors.More particularly to a kind of brushless dc of noninductive Boost topology driving
Machine commutation torque ripple minimization method.
Background technique
The advantages that brshless DC motor is simple with its structure, power density height and stable and reliable operation, in Industry Control, boat
Empty space flight and electric car field are used widely.However, since motor inductances and limited contravarianter voltage are hindered and are changed
The quick variation of phase current during phase, thus motor generates biggish torque ripple, maximum commutation torque wave in commutation process
The 50% of dynamic reachable average torque.Commutation torque ripple will lead to vibration and the noise of electric system, and the band for reducing motor carries
Ability is one of the main problem for limiting the operation of brshless DC motor high-performance.
In recent years, scholars have made intensive studies commutation torque ripple minimization.Brshless DC motor commutation is inhibited to turn
The common method of square fluctuation mainly includes two classes: (1) pulse duration modulation method (PWM method), and the essential idea of this method is to maintain
Non-commutation phase current it is steady, to realize the inhibition of commutation torque ripple.(2) preceding stage DC-DC converter is added, this method
Essential idea is effectively to inhibit commutation torque ripple by changing the DC input voitage of voltage source inverter.
However, existing commutation torque ripple minimization method still remains some problems: for PWM method, when motor is transported
When rated speed higher rotation speed below, under the limitation of limited DC side voltage of converter, such method passes through row
The method for extending shutdown phase current fall time inhibits commutation torque ripple, can extend the undesirable commutation process time in this way.
For existing preceding stage DC-DC converter method, the power switch of the preceding stage DC-DC converter of addition is more, and needs to add
Additional inductance, which increase the volume of drive system and costs.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of high-precision servos for brshless DC motor to drive control
The brshless DC motor commutation torque ripple minimization method of the noninductive Boost topology driving of system.
The technical scheme adopted by the invention is that: a kind of brshless DC motor commutation torque wave of noninductive Boost topology driving
Dynamic suppressing method, includes the following steps:
1) a kind of noninductive DC-DC converter addition is designed in three-phase voltage source inverter prime, is integrally formed noninductive boosting
The three-phase voltage source inverter driving circuit of topology；
2) effect of the different switching vector selectors to motor input voltage and noninductive DC-DC converter output voltage is analyzed；
3) when the brshless DC motor operates in the non-commutation stage, according to the effect of switching vector selector design normal mode,
Three kinds of operating modes of boost mode and decompression mode；By selecting three kinds of operating modes, normally adjusted in guarantee brshless DC motor
The output voltage of DC-DC converter is adjusted under the premise of speed；
4) when the brshless DC motor operates in the commutation stage, using fixed two switching vector selectors inhibition brushless direct-current
The commutation torque ripple of motor.
The noninductive DC-DC converter circuit includes: that the MOSFET of DC-DC converter is managed, DC side diode, and
DC-DC converter capacitor.The source electrode of the MOSFET pipe of the DC-DC converter is separately connected the cathode and three of DC side diode
The drain electrode of the electrode input end of phase voltage source inventer, the MOSFET pipe of the DC-DC converter passes through DC-DC converter capacitor
It is separately connected the negative input of input DC power cathode and three-phase voltage source inverter, the anode of the DC side diode
Connect input DC power anode.
Step 2) includes: the choosing in the three-phase voltage source inverter driving circuit for the noninductive Boost topology that step 1) is constituted
4 kinds of switching vector selectors are selected to realize normal speed regulation and the voltage regulation function of noninductive DC-DC converter of brshless DC motor, described 4
Kind switching vector selector is expressed as Vm0, Vm1, Va0And Va1, wherein Vm0And Vm1For master vector, Va0And Va1For auxiliary vector；Main arrow
It measures and the voltage for being greater than zero is provided to brshless DC motor, increase brshless DC motor forward current；Auxiliary vector is to brushless direct-current
Motor provides the voltage less than or equal to zero, reduces brshless DC motor forward current；Vm1Noninductive DC-DC converter can be reduced
Output voltage, Va1Noninductive DC-DC converter output voltage, V can be increasedm0And Va0It is equal to noninductive DC-DC converter output voltage
Do not influence.
The switching vector selector Vm0The circuit that lower electric current is passed through is: input DC power anode passes sequentially through DC side two
Pole pipe connects the forward conduction phase of brshless DC motor, brshless DC motor with the upper bridge arm MOSFET pipe of motor forward conduction phase
Negative sense conducting mutually by motor negative sense be connected phase lower bridge arm MOSFET pipe connect input DC power cathode.
The switching vector selector Vm1The circuit that lower electric current is passed through is: the anode of DC-DC converter capacitor passes sequentially through DC-
The MOSFET pipe of DC converter connects the forward conduction of brshless DC motor with the upper bridge arm MOSFET pipe of motor forward conduction phase
The negative sense conducting of phase, brshless DC motor mutually connects DC-DC converter by the lower bridge arm MOSFET pipe that phase is connected in motor negative sense
The cathode of capacitor.
The switching vector selector Va0The circuit that lower electric current is passed through is: the lower bridge arm MOSFET pipe of motor forward conduction phase
The forward conduction phase of the cathode connection brshless DC motor of anti-paralleled diode, the negative sense conducting of brshless DC motor mutually pass through electricity
The anti-paralleled diode of the lower bridge arm MOSFET pipe of the lower bridge arm MOSFET pipe connection motor forward conduction phase of phase is connected in machine negative sense
Anode.
The switching vector selector Va1The circuit that lower electric current is passed through is: the cathode of DC-DC converter capacitor is passing through motor just
To the forward conduction phase of the anti-paralleled diode connection brshless DC motor of the lower bridge arm MOSFET pipe of conducting phase, DC-DC transformation
The anode of device capacitor passes sequentially through the anti-paralleled diode of DC-DC converter MOSFET pipe and the upper bridge arm of motor negative sense conducting phase
Phase is connected in the negative sense of the anti-paralleled diode connection brshless DC motor of MOSFET pipe connection.
Described in step 3):
Normal mode selects master vector for Vm0, auxiliary vector Va0And the MOSFET shutdown in DC-DC converter, the mould
Formula does not influence the output voltage of DC-DC converter；
Boost mode selects master vector for Vm0, auxiliary vector Va1, which can increase the output of DC-DC converter
Voltage；
Decompression mode selects master vector for Vm1, auxiliary vector Va0And the MOSFET conducting in DC-DC converter, the mould
Formula can reduce the output voltage of DC-DC converter；
The duty ratio for enabling normal mode is d1, when guaranteeing that motor input voltage is identical, the duty ratio d of boost mode2And drop
The duty ratio d of die pressing type3Respectively
In formula, UdcFor direct current power source voltage, UoFor the output voltage of DC-DC converter.
In step 4), select duty ratio for d in commutation areacmtMaster vector Vm1, duty ratio 1-dcmtAuxiliary vector
Va0, wherein commutation area duty ratio dcmtFor
In formula, E is opposite potential amplitude.
The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving of the invention, extends with using
The PWM method of shutdown phase current compares, by that can press down using raised contravarianter voltage and selected switching vector selector
The commutation process time is effectively shortened while commutation torque ripple processed, to improve the reliability of motor operation.Of the invention
The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving, the existing side with addition DC-DC converter
Method compares, and DC-DC boost topology of the invention is simple, and required power device is less, and drive system is greatly saved
Volume and cost.Method especially of the invention does not need addition additional inductance, benefit by blending topology with motor control
The boost capability of topology is realized with the inductance characteristic of machine winding itself.
Detailed description of the invention
Fig. 1 is the controller chassis of the brshless DC motor commutation torque ripple minimization method of the noninductive Boost topology driving of the present invention
Figure；
In figure
1: current controller 2: normal mode
3: boost mode 4: decompression mode
5: model selection 6: back-emf fitting
7: commutation judges 8: Hall sensor
9: brshless DC motor 10: three-phase voltage source inverter
11: noninductive Boost topology
Fig. 2 is the permanent-magnet brushless DC electric machine system equivalent circuit of noninductive DC-DC Boost topology driving in the present invention；
Fig. 3 a is when motor operation is in non-commutation stage, switching vector selector Vm0The circuit that lower electric current is passed through；
Fig. 3 b is when motor operation is in non-commutation stage, switching vector selector Vm1The circuit that lower electric current is passed through；
Fig. 3 c is when motor operation is in non-commutation stage, switching vector selector Va0The circuit that lower electric current is passed through；
Fig. 3 d is when motor operation is in non-commutation stage, switching vector selector Va1The circuit that lower electric current is passed through；
Fig. 4 a is in commutation stage current by a+b-→a+c-When switching vector selector Vm1The circuit that lower electric current is passed through；
Fig. 4 b is in commutation stage current by a+b-→a+c-When switching vector selector Va0The circuit that lower electric current is passed through.
Specific embodiment
Brshless DC motor commutation torque below with reference to embodiment and attached drawing to noninductive Boost topology driving of the invention
Fluctuation suppressing method is described in detail.
As shown in Figure 1.The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving of the invention,
It is the control method that non-commutation area or commutation area are selected by operation interval judgement.In non-commutation area, by reasonably selecting work
Mode adjusts the output voltage of noninductive DC-DC Boost topology under the premise of guaranteeing that motor normally adjusts the speed.In commutation area, utilize
The output voltage of noninductive DC-DC Boost topology inhibits commutation torque ripple using unified switching vector selector, and when shortening commutation
Between.
The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving of the invention, including walk as follows
It is rapid:
1) a kind of noninductive DC-DC converter addition is designed in three-phase voltage source inverter prime, and overall structure is as shown in Figure 2
Noninductive Boost topology three-phase voltage source inverter driving circuit；In Fig. 2, C is DC-DC converter capacitor；SiAnd Di, respectively
For the MOSFET pipe and its anti-paralleled diode in driving circuit, i ∈ { 1,2 ..., 7 } therein；D8For DC side diode；N
For motor three-phase windings neutral point.
The noninductive DC-DC converter circuit includes: the MOSFET pipe S of DC-DC converter7, DC side diode D8,
With DC-DC converter capacitor C.The MOSFET pipe S of the DC-DC converter7Source electrode be separately connected DC side diode D8It is negative
The electrode input end of pole and three-phase voltage source inverter, the MOSFET pipe S of the DC-DC converter7Drain electrode pass through DC-DC become
Parallel operation capacitor C is separately connected the negative input of input DC power cathode and three-phase voltage source inverter, the DC side two
Pole pipe D8Anode connection input DC power anode.
2) effect of the different switching vector selectors to motor input voltage and noninductive DC-DC converter output voltage is analyzed；
For brshless DC motor using control mode is connected two-by-two, i.e. any time only has the conducting of two phase windings in the present invention.
It enables p and n respectively indicate forward current conducting according to phase current direction and phase, the p and n of different Hall sectors mutually is connected with negative current
As shown in table 1.
The forward current conducting of the different Halls of table 1 sector is mutually and phase is connected in negative current
| Ha Hb Hc | 1 0 1 | 1 0 0 | 1 1 0 | 0 1 0 | 0 1 1 | 0 0 1 |
| Hall sector | ⑤ | ④ | ⑥ | ② | ③ | ① |
| (p,n) | (a,b) | (a,c) | (b,c) | (b,a) | (c,a) | (c,b) |
Note: Ha, Hb and Hc are respectively a, the hall signal of b and c three-phase.Motor is pressed Hall sequence in table from left to right and is transported
Row.
Enable SpHAnd SnLRespectively indicate bridge arm switching tube and n phase lower bridge arm switching tube in p phase.According to switching vector selector to motor
The effect of inputting line voltage and storage capacitor voltage proposes that lower of topology need to select 4 kinds of switching vector selectors in the present invention
Realize the voltage regulation function of electric machine speed regulation and noninductive DC-DC Boost topology output voltage.This 4 kinds of switching vector selectors are expressed as Vm0,
Vm1, Va0And Va1, wherein Vm0And Vm1For master vector, Va0And Va1It is specific as shown in table 2 for auxiliary vector.In table, Upn, UdcAnd Uo
Motor inputting line voltage in the unit control period is respectively indicated, direct current power source voltage and DC-DC converter output voltage are averaged
Value.
4 kinds of switching vector selectors that table 2 designs herein
Note: " 1 " indicates switching tube conducting, and " 0 " indicates switching tube shutdown, and " x " indicates switching tube on or off."-" table
Showing does not influence, and " ↑ " indicates to increase, and " ↓ " indicates to reduce.The non-column switching tube of other in table is turned off.
The different switching vector selectors of heretofore described analysis are to motor input voltage and noninductive DC-DC converter output voltage
Effect, comprising:
In the three-phase voltage source inverter driving circuit for the noninductive Boost topology that step 1) is constituted, 4 kinds of switch arrows are selected
Measure the normal speed regulation to realize brshless DC motor and the voltage regulation function of noninductive DC-DC converter, 4 kinds of switching vector selectors point
V is not expressed as itm0, Vm1, Va0And Va1, wherein Vm0And Vm1For master vector, Va0And Va1For auxiliary vector；Master vector is to brushless direct-current
Motor provides the voltage greater than zero, increases brshless DC motor forward current；Auxiliary vector is less than to brshless DC motor offer
Or null voltage, reduce brshless DC motor forward current；Vm1Noninductive DC-DC converter output voltage, V can be reduceda1
Noninductive DC-DC converter output voltage, V can be increasedm0And Va0Noninductive DC-DC converter output voltage is not influenced.It is logical
The switching vector selector reasonably selected in master vector and auxiliary vector is crossed, can be realized the voltage regulation function of DC-DC converter.Wherein:
As shown in Figure 3a, the switching vector selector Vm0The circuit that lower electric current is passed through is: input DC power anode is successively
Pass through DC side diode D8With the upper bridge arm MOSFET pipe S of motor forward conduction phasepHConnect the positive guide of brshless DC motor
The lower bridge arm MOSFET pipe S of phase is connected by motor negative sense by logical phase p, the negative sense conducting phase n of brshless DC motornLConnection input is straight
Flow power cathode.
As shown in Figure 3b, the switching vector selector Vm1The circuit that lower electric current is passed through is: DC-DC converter capacitor C is just
Pole passes sequentially through the MOSFET pipe S of DC-DC converter7With the upper bridge arm MOSFET pipe S of motor forward conduction phasepHIt connects brushless straight
The lower bridge arm MOSFET of phase is connected by motor negative sense by the forward conduction phase p of galvanic electricity machine, the negative sense conducting phase n of brshless DC motor
Pipe SnLConnect the cathode of DC-DC converter capacitor C.
As shown in Figure 3c, the switching vector selector Va0The circuit that lower electric current is passed through is: the lower bridge of motor forward conduction phase
Arm MOSFET pipe SpLAnti-paralleled diode DpLCathode connection brshless DC motor forward conduction phase p, brshless DC motor
Negative sense conducting phase n by motor negative sense be connected phase lower bridge arm MOSFET pipe SnLConnect the lower bridge arm of motor forward conduction phase
MOSFET pipe SpLAnti-paralleled diode DpLAnode.
As shown in Figure 3d, the switching vector selector Va1The circuit that lower electric current is passed through is: DC-DC converter capacitor C's is negative
Pole passes through the lower bridge arm MOSFET pipe S of motor forward conduction phasepLAnti-paralleled diode DpLConnect the forward direction of brshless DC motor
Phase p is connected, the anode of DC-DC converter capacitor C passes sequentially through DC-DC converter MOSFET pipe S7Anti-paralleled diode D7With
The upper bridge arm MOSFET pipe S of motor negative sense conducting phasenHThe anti-paralleled diode D of connectionnHThe negative sense of connection brshless DC motor is led
Logical phase n.
3) when the brshless DC motor operates in the non-commutation stage, according to the reasonably combined master vector of the effect of switching vector selector
And auxiliary vector, design three kinds of normal mode, boost mode and decompression mode operating modes；By selecting three kinds of operating modes,
The output voltage of DC-DC converter is adjusted under the premise of guaranteeing that brshless DC motor normally adjusts the speed；4. with Hall sector in table 2
For, the mean value calculation of motor inputting line voltage is as follows in the unit control period under three kinds of operating modes: where
(1) normal mode selects master vector for Vm0, auxiliary vector Va0And the MOSFET shutdown in DC-DC converter,
The mode does not influence the output voltage of DC-DC converter；
As shown in Fig. 3 a and Fig. 3 c, V is enabledm0Duty ratio be d1, Va0Duty ratio be 1-d1, S at this timenLPerseverance conducting, S7It is permanent
Shutdown, SpHWith duty ratio d1Copped wave.The average inputting line voltage U of motorpnFor
Upn=d1Udc+(1-d1) 0=d1Udc (1)
In formula, UpnAnd UdcRespectively indicate the average value of unit control period motor inputting line voltage and direct current power source voltage.
(2) boost mode selects master vector for Vm0, auxiliary vector Va1, which can increase DC-DC converter
Output voltage；
As shown in Fig. 3 a and Fig. 3 d, V is enabledm0Duty ratio be d2, Va1Duty ratio be 1-d2, S at this time7Perseverance shutdown, SpHWith
SnLSimultaneously with duty ratio d2Copped wave.Average inputting line voltage UpnFor
In formula, UoIndicate the average value of unit control period DC-DC converter output voltage.
(3) decompression mode selects master vector for Vm1, auxiliary vector Va0And the MOSFET conducting in DC-DC converter,
The mode can reduce the output voltage of DC-DC converter；
As shown in Fig. 3 b and Fig. 3 c, V is enabledm1Duty ratio be d3, Va0Duty ratio be 1-d3, S at this time7And SnLPerseverance conducting,
SpHWith duty ratio d3Copped wave.Average inputting line voltage UpnFor
Upn=d3Uo+(1-d3) 0=d3Uo (3)
Formula (1) is substituted into formula (2) and formula (3) respectively, in the normal mode under effective vector duty cycle d1On the basis of, identical electricity
D under machine inputting line voltage2And d3Respectively
In formula, UdcFor direct current power source voltage, UoFor the output voltage of DC-DC converter.
By formula (1)~(3) it is found that these three control models can make motor inputting line voltage meet Upn∈[0,Udc],
To guarantee the normal speed regulation demand of motor.In addition, according to noninductive Boost topology output voltage UoWith reference voltage UrefComparison
Relationship selects suitable operating mode, to adjust the output voltage of noninductive Boost topology for commutation process use.Consider electricity
Press the ring width w of hysteresis comparator0, non-commutation area modulation strategy is as shown in table 3.
3 non-commutation area modulation strategy of table
Note: " 1 " indicates switching tube conducting, and " 0 " indicates switching tube shutdown, " d1”,“d2" and " d3" indicate respective switch pipe with
The duty ratio copped wave.Other non-column switching tubes are turned off.
4) when the brshless DC motor operates in the commutation stage, using fixed two switching vector selectors inhibition brushless direct-current
The commutation torque ripple of motor.Select duty ratio for d in commutation areacmtMaster vector Vm1, duty ratio 1-dcmtAuxiliary vector
Va0, and S7Conducting.The modulation strategy that commutation area can be obtained according to table 2 is as shown in table 4.
4 commutation area modulation strategy of table
Note: " 1 " indicates switching tube conducting, " dcmt" indicate respective switch pipe with the duty ratio copped wave.Other non-column switching tubes
It is turned off.Motor is pressed Hall sequence in table from left to right and is run.
With Hall period 4. in electric current by a+b-→a+c-For, the equivalent circuit under switching vector selector effect is as shown in Figure 4.
According to Fig. 4 a and Fig. 4 b, brushless dc generator terminal voltage equation is as follows:
In formula, R is machine winding phase resistance.L is machine winding phase inductance.ua,ubAnd ucIt is opposite for motor three-phase windings end
DC power cathode voltage.uNIt is machine winding neutral point with respect to DC power supply cathode voltage.ia,ibAnd icFor motor three-phase around
Group phase current.ea,ebAnd ecFor motor three-phase windings phase back-emf.
Assuming that commutation stage back-emf is constant, it is flat that commutation area unit controls three-phase windings end voltage and opposite potential in the period
Mean value is respectively
In formula, Ua, UbAnd UcPeriod end average voltage is controlled for unit；Ea, EbAnd EcOpposite potential when for commutation；E is
Opposite potential amplitude when commutation.
Formula (6) are substituted into formula (5) and negligible resistance, Non-commutation phase current iaThe average rate of change be respectively
According to formula (7), inhibit commutation torque ripple, commutation area duty ratio d to maintain the Non-commutation phase current constantcmtIt needs
Meet
Because of duty ratio dcmt∈ [0,1], the storage capacitor voltage known to formula (8) need to meet
Uo≥4E (9)
Similar, the analytic process and duty ratio d of other Hall sectorscmtDerivation result and Hall sector it is 4. identical.
In conclusion commutation area selects master vector V under the conditions of meeting formula (9)m1With auxiliary vector Va0Can effectively it press down
Commutation torque ripple processed.
Claims (8)
1. a kind of brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving, which is characterized in that including
Following steps:
1) a kind of noninductive DC-DC converter addition is designed in three-phase voltage source inverter prime, is integrally formed noninductive Boost topology
Three-phase voltage source inverter driving circuit；
2) effect of the different switching vector selectors to motor input voltage and noninductive DC-DC converter output voltage is analyzed；Include:
In the three-phase voltage source inverter driving circuit for the noninductive Boost topology that step 1) is constituted, 4 kinds of switching vector selectors is selected
Realize that normal speed regulation and the voltage regulation function of noninductive DC-DC converter of brshless DC motor, 4 kinds of switching vector selectors distinguish table
It is shown as Vm0, Vm1, Va0And Va1, wherein Vm0And Vm1For master vector, Va0And Va1For auxiliary vector；Master vector is to brshless DC motor
Voltage greater than zero is provided, brshless DC motor forward current is increased；Auxiliary vector is less than or waits to brshless DC motor offer
In zero voltage, brshless DC motor forward current is reduced；Vm1Noninductive DC-DC converter output voltage, V can be reduceda1It can
Increase noninductive DC-DC converter output voltage, Vm0And Va0Noninductive DC-DC converter output voltage is not influenced；
3) when the brshless DC motor operates in the non-commutation stage, according to the effect of switching vector selector design normal mode, boosting
Three kinds of operating modes of mode and decompression mode；By selecting three kinds of operating modes, guaranteeing what brshless DC motor normally adjusted the speed
Under the premise of adjust DC-DC converter output voltage；
4) when the brshless DC motor operates in the commutation stage, using fixed two switching vector selectors inhibition brshless DC motor
Commutation torque ripple.
2. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, the noninductive DC-DC converter circuit includes: the MOSFET pipe (S of DC-DC converter7), two pole of DC side
Manage (D8) and DC-DC converter capacitor (C)；The MOSFET of the DC-DC converter manages (S7) source electrode be separately connected DC side
Diode (D8) cathode and three-phase voltage source inverter electrode input end, the MOSFET of the DC-DC converter manages (S7)
Drain electrode is separately connected input DC power cathode by DC-DC converter capacitor (C) and the cathode of three-phase voltage source inverter is defeated
Enter end, the DC side diode (D8) anode connection input DC power anode.
3. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, the switching vector selector Vm0The circuit that lower electric current is passed through is: input DC power anode passes sequentially through direct current
Side diode (D8) and motor forward conduction phase upper bridge arm MOSFET manage (SpH) connection brshless DC motor forward conduction phase
(p), negative sense conducting phase (n) of brshless DC motor manages (S by the lower bridge arm MOSFET that phase is connected in motor negative sensenL) connection input
DC power cathode.
4. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, the switching vector selector Vm1The circuit that lower electric current is passed through is: the anode of DC-DC converter capacitor (C) is successively
(S is managed by the MOSFET of DC-DC converter7) and motor forward conduction phase upper bridge arm MOSFET manage (SpH) connection brushless direct-current
The lower bridge arm of phase is connected by motor negative sense for the forward conduction phase (p) of motor, negative sense conducting phase (n) of brshless DC motor
MOSFET manages (SnL) connection DC-DC converter capacitor (C) cathode.
5. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, the switching vector selector Va0The circuit that lower electric current is passed through is: the lower bridge arm MOSFET of motor forward conduction phase
Manage (SpL) anti-paralleled diode (DpL) cathode connection brshless DC motor forward conduction phase (p), brshless DC motor
Negative sense is connected phase (n) and manages (S by the lower bridge arm MOSFET that phase is connected in motor negative sensenL) connection motor forward conduction phase lower bridge arm
MOSFET manages (SpL) anti-paralleled diode (DpL) anode.
6. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, the switching vector selector Va1The circuit that lower electric current is passed through is: the cathode of DC-DC converter capacitor (C) passes through
The lower bridge arm MOSFET of motor forward conduction phase manages (SpL) anti-paralleled diode (DpL) connection brshless DC motor positive guide
Logical phase (p), the anode of DC-DC converter capacitor (C) pass sequentially through DC-DC converter MOSFET pipe (S7) anti-paralleled diode
(D7) and motor negative sense conducting phase upper bridge arm MOSFET manage (SnH) connection anti-paralleled diode (DnH) connection brushless dc
Phase (n) is connected in the negative sense of machine.
7. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, described in step 3):
Normal mode selects master vector for Vm0, auxiliary vector Va0And the MOSFET shutdown in DC-DC converter, the mode pair
The output voltage of DC-DC converter does not influence；
Boost mode selects master vector for Vm0, auxiliary vector Va1, which can increase the output voltage of DC-DC converter；
Decompression mode selects master vector for Vm1, auxiliary vector Va0And the MOSFET conducting in DC-DC converter, the mode energy
Enough reduce the output voltage of DC-DC converter；
The duty ratio for enabling normal mode is d1, when guaranteeing that motor input voltage is identical, the duty ratio d of boost mode2With decompression mould
The duty ratio d of formula3Respectively
In formula, UdcFor direct current power source voltage, UoFor the output voltage of DC-DC converter.
8. the brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving according to claim 1,
It is characterized in that, selecting duty ratio for d in commutation area in step 4)cmtMaster vector Vm1, duty ratio 1-dcmtAuxiliary vector
Va0, wherein commutation area duty ratio dcmtFor
In formula, E is opposite potential amplitude, UoIndicate the average value of unit control period DC-DC converter output voltage.
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