CN108092594A - One kind opens winding three-phase motor fault-tolerant system and its control method - Google Patents

One kind opens winding three-phase motor fault-tolerant system and its control method Download PDF

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Publication number
CN108092594A
CN108092594A CN201810055077.7A CN201810055077A CN108092594A CN 108092594 A CN108092594 A CN 108092594A CN 201810055077 A CN201810055077 A CN 201810055077A CN 108092594 A CN108092594 A CN 108092594A
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mrow
msub
mtr
mtd
inverter
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Inventor
林海
陈金平
龚贤武
周熙炜
司利云
陈俊硕
巩建英
李耀华
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Changan University
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Changan University
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Priority to CN201810055077.7A priority Critical patent/CN108092594A/en
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Abstract

One kind opens winding three-phase motor fault-tolerant system and its control method, tolerant system includes the winding electric machine of opening of star winding points of common connection opening, and current input terminal a, b, c and current output terminal x, y, z connect inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx respectively；Inverter work bridge arm Bra, Brb, Brc bridge arm Bf1 composition inverter Is fault-tolerant with inverter in parallel, inverter work bridge arm Brz, Bry, Brx and inverter in parallel hold bridge arm Bf2 composition inverters II, the present invention is using two fault-tolerant bridge arms of inverter of bridge inverter and auxiliary of enjoying a double blessing, trouble point can be quickly removed in inverter switching device failure, even change system topology in the case where multiple faults point occurs, so that system remains able to continue safe and reliable operation, the lasting reliability service of production process has been effectively ensured.The present invention has very strong versatility, suitable for polytype motor.

Description

One kind opens winding three-phase motor fault-tolerant system and its control method
Technical field
The present invention relates to Power Electronic Technique, and in particular to one kind opens winding three-phase motor fault-tolerant system and its controlling party Method.
Background technology
Fault-toleranr technique generally refers to sustainable control technology of the system under most common failure, i.e., when in running order is When one or several key components break down in system, system can be by automatic detect and diagnose, and takes fault-tolerant measure Ensure that system continues to predetermined function or keeps technology of its function operation in allowed band.Since motor is strong as one Coupling, nonlinear Control object, in long-term work, drive system is also a multiple Complex Nonlinear System of failure. Therefore, there is very big economic benefit and good application background for the research of motor fault-tolerant control technology.
Fault-toleranr technique common at present mainly has：Hardware fault-tolerant technology, function fault-toleranr technique, software fault-tolerant technology, robust Fault-toleranr technique and reconstruct Fault Tolerance Control Technology etc..Wherein reconstruct fault-toleranr technique is a hot spot of Recent study.
Recently as industrial fast development, control system is in structurally and functionally increasingly complicated, failure Multifarious feature is presented.The reliability and stability requirement of control system improves increasingly.Reconstruct the main core of fault-toleranr technique It is：Using fault detection and diagnosis mechanism, continual fault detect and estimation can be carried out to real-time working system, by failure Mechanism is diagnosed according to detecting and estimating signal troubleshooting reason, the faults-tolerant control strategy of design is recycled dynamically to reconfigure Controller.So system still ensures that certain system function and control effect under new controller.
Reconstruct tolerant system generally comprises：Fault detection and diagnosis, failure decision-making and the several parts of reconfigurable control.It is wherein heavy Structure control is emphasis.Generally, for motor driven systems, in the case of being only respective switch or sensor fault, it is System is not necessarily entirely ineffective, this is primarily due to deposit between the control function of each mechanism of system and different detection signals In difference, can be made up by using other mechanisms and sensor.Thus can by way of system reconfiguration weight New to change system, the stability and functional requirements for making system to a certain extent can still be met.
So, it is necessary to a kind of motor driven systems with reconstruct fault-tolerant ability are developed on the basis of conventional motors.
The content of the invention
It is an object of the invention to it is middle for the above-mentioned prior art the problem of, one kind is provided and opens winding three-phase motor fault-tolerant system System and its control method, guarantee open winding electric machine drive system when inverter breaks down with the energy continually and steadily to work Power.
To achieve these goals, it is defeated including opening common point formation electric current to open winding three-phase motor fault-tolerant system by the present invention Enter to hold a, b, c and current output terminal x, y, z opens winding electric machine M, and the current input terminal a and current output terminal x is set respectively At the both ends of armature winding A, current input terminal b and current output terminal y is separately positioned on the both ends of armature winding B, electric current input End c and current output terminal z is separately positioned on the both ends of armature winding C；Current input terminal a, b, c and current output terminal x, y, z point It Lian Jie not inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx；Inverter work bridge arm Bra, Brb, Brc with it is in parallel The fault-tolerant bridge arm Bf1 compositions inverter I of inverter, inverter work bridge arm Brz, Bry, Brx and inverter in parallel hold bridge arm Bf2 Form inverter II；Current input terminal a points of the armature winding A are two-way, a-road-through cross quick fuse fuse Fa with it is inverse The midpoint Na for becoming device bridge arm Bra is connected, the midpoint Nf1 phases that another way passes through bidirectional thyristor TRa and the fault-tolerant bridge arm Bf1 of inverter Even；X points of the current output terminal of armature winding A is two-way, and a-road-through is crossed in quick fuse fuse Fx and inverter leg Brx Point Nx is connected, and another way is connected by bidirectional thyristor TRx with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of inverter；The armature winding B points of the current input terminal of B is two-way, and a-road-through crosses quick fuse fuse Fb and is connected with the midpoint Nb of inverter leg Brb, separately It is connected all the way by bidirectional thyristor TRb with the midpoint Nf1 of the fault-tolerant bridge arm Bf1 of inverter；The current output terminal y of armature winding B It is divided into two-way, a-road-through crosses quick fuse fuse Fy and is connected with the midpoint Ny of inverter leg Bry, and another way passes through two-way crystalline substance Brake tube TRy is connected with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of inverter；Current input terminal c points of the armature winding C are two-way, one Road is connected by quick fuse fuse Fc with the midpoint Nc of inverter leg Br3, another way by bidirectional thyristor TRc with it is inverse The midpoint Nf1 for becoming device fault-tolerant bridge arm Bf1 is connected, and z points of current output terminal is two-way, a-road-through cross quick fuse fuse Fz with it is inverse The midpoint Nz for becoming device bridge arm Brz is connected, the midpoint Nf2 phases that another way passes through bidirectional thyristor TRz and the fault-tolerant bridge arm Bf2 of inverter Even；Distinguish on described inverter work bridge arm Bra, Brb, Brc, Brz, Bry, the Brx and inverter fault-tolerant bridge arm Bf1, Bf2 Set there are two power switch pipe, each power switch pipe and bidirectional thyristor TRa, TRb, TRc, TRx, Try, TRz connects controller respectively.
Current input terminal a, b, c are connected on inverter work bridge arm Bra, Brb, Brc and fault-tolerant bridge arm Bf1 of inverter Power switch pipe and bidirectional thyristor TRa, TRb, TRc connection controller CON1；
Current output terminal x, y, z is connected on inverter work bridge arm Brz, Bry, Brx and fault-tolerant bridge arm Bf2 of inverter Power switch pipe and bidirectional thyristor TRx, Try, TRz connection controller CON2.
Controller CON1 detects the electric current of current input terminal a, b, c by current sensor respectively；
Controller CON2 detects the electric current of current output terminal x, y, z by current sensor respectively.
Two power switch pipes on inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx are connected one respectively to be melted Disconnected fuse.The power that inverter works on bridge arm Bra, Brb, Brc, Brz, Bry, Brx and inverter fault-tolerant bridge arm Bf1, Bf2 Switching tube uses IGBT or MOSFET.Inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx and the fault-tolerant bridge arm of inverter A power switch pipe backward dioded in parallel on Bf1, Bf2.The winding electric machine M that opens uses star winding commonly connected Permanent magnet synchronous motor, brshless DC motor or the AC induction motor that point is opened.
The present invention opens the control method of winding three-phase motor fault-tolerant system, including step：
1) the three-phase stator winding phase current I of winding electric machine M is opened in detectiona, Ib, IcWith phase voltage Va, Vb, Vc；
Motor system fault Status Flag F is judged according to testing result：
2) when electric system normal health works, F=0, bidirectional thyristor TRa, TRb, TRc, TRx, TRy, TRz's touches Originator voltage signal is TRa=TRb=TRc=TRx=TRy=TRz=0, inverter work bridge arm Bra, Brb, Brc, Brx, Bry, Brz are in running order, and inverter fault-tolerant bridge arm Bf1, Bf2 are in off position；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
In formula, IsFor reference current amplitude, INa、INb、INc、INx、INy、INzIt is flowed to for six work bridge arm midpoints of inverter The electric current of motor, INf1、INf2The electric current of motor is flowed to for the fault-tolerant bridge arm midpoint of two inverters, θ is angle of rotor of motor；
At this point, effective phase voltage that each bridge arm of inverter is output to motor two-phase stator winding is：
V in formulamFor output voltage amplitude, VNa-NxFor inverter leg Bra midpoint Na and inverter leg Brx midpoint Nx it Between output voltage, VNb-NyFor the output voltage between inverter leg Brb midpoint Nb and inverter leg Bry midpoint Ny；
3) when inverter leg Bra failures, failure includes bridgc arm short or open circuit, F=1, TRa=1, TRb=TRc= TRx=TRy=TRz=0, five inverter work bridge arms Brb, Brc, Brx, Bry, Brz are in running order, and inverter is fault-tolerant Bridge arm Bf1 is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
4) when electric system inverter leg Brb failures, failure include bridgc arm short or open circuit, F=2, TRb=1, TRa=TRc=TRx=TRy=TRz=0, five inverter work bridge arms Bra, Brc, Brx, Bry, Brz are in running order, The fault-tolerant bridge arm Bf1 of inverter is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
5) when electric system inverter leg Brc failures, failure include bridgc arm short or open circuit, F=3, TRc=1, TRa=TRb=TRx=TRy=TRz=0, five inverter work bridge arms Bra, Brb, Brx, Bry, Brz are in running order, The fault-tolerant bridge arm Bf1 of inverter is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
6) when electric system inverter leg Brx failures, failure include bridgc arm short or open circuit, F=4, TRx=1, TRa=TRb=TRc=TRy=TRz=0, Fault tolerant inverter only five work bridge arm Bra, Brb, Brc, Bry, Brz are in work Make state, fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
7) when electric system inverter leg Bry failures, failure include bridgc arm short or open circuit, F=5, TRy=1, TRa=TRb=TRc=TRx=TRz=0, five inverter work bridge arms Bra, Brb, Brc, Brx, Brz are in running order, The fault-tolerant bridge arm Bf2 of inverter is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
8) when electric system inverter leg Brz failures, failure include bridgc arm short or open circuit, F=6, TRz=1, TRa=TRb=TRc=TRx=TRy=0, five inverter work bridge arms Bra, Brb, Brc, Brx, Bry are in running order, The fault-tolerant bridge arm Bf2 of inverter is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
9) when any two in electric system inverter leg Bra, Brb, Brc or whole bridge arms break down, failure Including bridgc arm short or open circuit, F=7, eight bridge arm working condition such as following tables of inverter：
Wherein, F representing faults state, H represent health status；
At this point, TRa=TRb=TRc=1, TRx=TRy=TRz=0；Only three work bridge arm Brx of Fault tolerant inverter, Bry, Brz are in running order, and fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
Under the fault-tolerant mode, machine winding becomes star-like connection mode, the fault-tolerant bridge of inverter from opening winding connection Arm Bf1 midpoint Nf1 are directly connected on machine winding common point, the fault-tolerant bridge arm Bf1 mid-point voltages V of inverterNf1Equal to three-phase electricity Machine common-mode voltage component V0=(VNx-Nf1+VNy-Nf1+VNz-Nf1)/3, machine winding common point voltage will be controlled by fault-tolerant bridge arm Bf1, at this time motor common-mode voltage component will be effectively suppressed；
10) when any two in electric system inverter leg Brx, Bry, Brz or whole bridge arms break down, failure Including bridgc arm short or open circuit, F=8, eight bridge arm working condition such as following tables of inverter：
At this point, TRa=TRb=TRc=0, TRx=TRy=TRz=1, only three work bridge arm Bra of Fault tolerant inverter, Brc, Brc are in running order, and fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
Under the fault-tolerant mode, machine winding becomes star-like connection mode, the fault-tolerant bridge of inverter from opening winding connection Arm Bf2 midpoint Nf2 are directly connected on machine winding common point, the fault-tolerant bridge arm Bf2 mid-point voltages V of inverterNf2Equal to three-phase electricity Machine common-mode voltage component V0=(VNa-Nf2+VNb-Nf2+VNc-Nf2)/3, it is fault-tolerant that machine winding common point voltage will be controlled by inverter Bridge arm Bf2, at this point, motor common-mode voltage component is inhibited.
Compared with prior art, inverter work bridge arm is divided into two groups by the present invention, and first group includes inverter service bridge Arm Bra, Brb, Brc, second group includes inverter work bridge arm Brz, Bry, Brx, and common switch fault includes switch open With two kinds of switch short.When occurring a bridge arm failure when any one group in this two groups of bridge arms or simultaneously, which will be by The fault-tolerant bridge arm of inverter substitutes, and system, which is still operated in, conventional opens 12 switching inverter drive pattern of phase winding motor.When In this two groups of bridge arms any one group of appearance two even whole bridge arm failures when, this group of bridge arm is by the fault-tolerant bridge arm of corresponding inverter It substitutes, system is operated in the star winding three phase electric machine operating mode under the driving of eight switching inverters.When same in this two groups of bridge arms When occur two even whole bridge arm failure when, beyond the scope of design of system fault tolerance mechanism, system will be unable to the number of defects Work.The present invention constructs the drive system with structure failure tolerance using the winding electric machine of opening that common point is opened, using double Full-bridge inverter simultaneously aids in two fault-tolerant bridge arms of inverter, can quickly remove trouble point in inverter switching device failure, even Change system topology in the case where multiple faults point occurs so that system remains able to continue safe and reliable operation, has Effect ensure that the lasting reliability service of production process.In addition, the present invention has very strong versatility, suitable for a variety of different types Three phase electric machine.
Further, the present invention opens permanent magnet synchronous motor, the nothing that winding electric machine is opened using star winding points of common connection Brushless motor or AC induction motor can be magneto, asynchronous machine, synchronous motor, reluctance motor and stepping electricity Machine etc..
Description of the drawings
Fig. 1 star winding three phase electric machine topological diagrams；
Fig. 2 opens phase winding three phase electric machine topological diagram；
Fig. 3 opens winding three-phase motor fault-tolerant drive system figure；
Winding three-phase motor fault-tolerant drive system figure is opened under Fig. 4 working healthily states；
Fig. 5 system inverters group any one inverter work bridge arm fault condition schematic diagram；
Two inverter work bridge arm fault condition schematic diagrames of Fig. 6 system inverters；
Three inverter work bridge arm fault condition schematic diagrames of Fig. 7 system inverters；
The space vector voltage distribution graph of six switching inverters of Fig. 8 output；
The space vector voltage distribution graph of 12 switching inverters of Fig. 9 output；
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The three phase electric machine structure of conventional star winding connection is as shown in Figure 1, open the three phase electric machine of phase winding connection structure As shown in Figure 2.The three phase electric machine that opening the three phase electric machine of phase winding connection structure can be connected by conventional star winding is simply transformed It obtains.Star winding connection common point is opened, three terminals that common point is unfolded into are drawn outside motor body.This Sample is just constituted opens phase winding three phase electric machine there are six winding terminals.Its basic physical arrangement and characteristic and conventional motor phase Together.In the case of the input of identical electrical power and operating mode, the work that opening the three phase electric machine of phase winding connection structure has bigger is imitated Rate.
Referring to Fig. 3, the present invention includes first, second, third and fourth, five, six inverter leg Bra, Brb, Brc, Brz, Bry, The fault-tolerant bridge arm Bf1 of Brx, first and second inverter, Bf2, first, second, third and fourth, five, six quick fuse fuse Fa, Fb, Fc, Fz, Fy, Fx, first, second, third and fourth, five, six bidirectional thyristor TRa, TRb, TRc, TRz, TRy, TRx；First, second, third and fourthth, 5th, six inverter leg Bra, Brb, Brc, Brz, Bry, Brx and first and second inverter fault-tolerant bridge arm Bf1, Bf2 amount to eight Bridge arm is switched, is connected after their parallel connections with public direct-current power supply；
Public direct-current power supply is powered simultaneously for this eight bridge arm, just extremely Vdc, cathode GND.
First inverter leg Bra is by the first fuse wire F1, first and second power switch pipe (S1, S2) composition and the Two fuse wire F2 are composed in series, and bridge arm midpoint Na is first and second power switch pipe (S1, S2) junction；
Second inverter leg Brb is by the 3rd fuse wire F3, third and fourth power switch pipe (S3, S4) composition and the Four fuse wire F4 are composed in series, and bridge arm midpoint Nb is third and fourth power switch pipe (S3, S4) junction；
3rd inverter leg Brc is by the 5th fuse wire F5, the five, the six power switch pipes (S5, S6) composition and the Six fuse wire F6 are composed in series, and bridge arm midpoint Nc is the five, the six power switch pipes (S5, S6) junction；
4th inverter leg Brz is by the 7th fuse wire F7, the seven, the eight power switch pipes (S7, S8) composition and the Eight fuse wire F8 are composed in series, and bridge arm midpoint Nz is the seven, the eight power switch pipes (S7, S8) junction；
5th inverter leg Bry by the 9th fuse wire F9, the nine, the ten power switch pipes (S9, S10) composition and Tenth fuse wire F10 is composed in series, and bridge arm midpoint Ny is the nine, the ten power switch pipes (S9, S10) junction；
6th inverter leg Brx is by the 11st fuse wire F11, the 11st, 12 power switch tube Ss 11, S12 groups Into and the 12nd fuse wire F12 be composed in series, bridge arm midpoint Nx is the 11,12 power switch pipes (S11, S12) Junction.
The fault-tolerant bridge arm Bf1 of first inverter is composed in series by the 13rd, 14 power switch pipes (T1, T2), the fault-tolerant bridge Arm midpoint Nf1 is the 13rd, 14 power switch pipes (T1, T2) junction；
The fault-tolerant bridge arm Bf2 of second inverter is composed in series by the 15th, 16 power switch pipes (T3, T4), the fault-tolerant bridge Arm midpoint Nf2 is the 15th, 16 power switch pipes (T3, T4) junction.
First, second, third and fourthth, five, six, seven, eight, nine, ten, 11,12,13,14,15,16 power switch Pipe S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, T1, T2, T3, T4 are common using IGBT or MOSFET etc. Device for power switching.
A points of a port for opening the first armature winding A of winding electric machine M is two-way, is protected all the way by the first quick fuse Dangerous silk Fa is connected with the midpoint Na of the first inverter leg Bra, and another way passes through the first bidirectional thyristor TRa and the first inverter The midpoint Nf1 of fault-tolerant bridge arm Bf1 is connected；Another port x of the first armature winding of motor A is also classified into two-way, passes through all the way 6th quick fuse fuse Fx is connected with the midpoint Nx of the 6th inverter leg Brx, and another way passes through the 4th bidirectional thyristor TRx is connected with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of the second inverter.
B points of a port for opening the second armature winding B of winding electric machine M is two-way, is protected all the way by the second quick fuse Dangerous silk Fb is connected with the midpoint Nb of the second inverter leg Brb, and another way passes through the second bidirectional thyristor TRb and the first inverter The midpoint Nf1 of fault-tolerant bridge arm Bf1 is connected；Another port y of the second armature winding of motor B is also classified into two-way, passes through all the way 5th quick fuse fuse Fy is connected with the midpoint Ny of the 5th inverter leg Bry, and another way passes through the 5th bidirectional thyristor TRy is connected with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of the second inverter.
C points of a port for opening the 3rd armature winding C of winding electric machine M is two-way, is protected all the way by the 3rd quick fuse Dangerous silk Fc is connected with the midpoint Nc of the 3rd inverter leg Brc, and another way passes through the 3rd bidirectional thyristor TRc and the first inverter The midpoint Nf1 of fault-tolerant bridge arm Bf1 is connected；Another port z of the 3rd armature winding C of motor is also classified into two-way, passes through all the way 4th quick fuse fuse Fz is connected with the midpoint Nz of the 4th inverter leg Brz, and another way passes through the 6th bidirectional thyristor TRz is connected with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of the second inverter.
Referring to Fig. 4, the overall operation principle of the present invention is as follows：When Fault tolerant inverter of the present invention is in normal operating conditions When, Fault tolerant inverter of the present invention is run according to the working method for opening 12 switching inverter of winding three-phase motor；Common switch Failure includes two kinds of switch open and switch short.When Fault tolerant inverter bridge arm power switch breaks down, detection circuit detects To after failure, control signal is sent by fault-tolerant mechanism, it is quick to adjust motor control strategy and realize inverter reconstruct.When this two groups In bridge arm (inverter I and II) any one group or simultaneously occur one work bridge arm failure when, which will be by fault-tolerant inverse Become device bridge arm to substitute, system, which is still operated in, conventional opens 12 switching inverter drive pattern of phase winding three phase electric machine, such as Fig. 5 It is shown；When any one group of appearance two even all work bridge arm failures in this two groups of bridge arm (inverter I and II), this group of bridge Arm is substituted by corresponding fault-tolerant bridge arm, the eight switching inverter operating modes that system work is connected into star winding, while electricity Three electric current outflow ports of machine stator winding link together and access fault-tolerant switch bridge arm midpoint, except motor stator winding three A electric current is flowed into outside port, and the star-like connection point of machine winding will be also among switch bridge arm controlled mode, motor stator around The common-mode voltage of group can be effectively suppressed, such as Fig. 6, shown in Fig. 7.After system topological reconstruct, motor three-phase windings power supply electricity Pressure still includes equilibrium, the still sustainable work of electric system.When appearance two simultaneously in this two groups of bridge arm (inverter I and II) Or two or more work bridge arm failure when, for the number of defects beyond the scope of design of system fault tolerance mechanism, system will be unable to work.
When system under bridge inverter of enjoying a double blessing opens winding electric machine pattern when working, system is by two six switch full inversions Device, two fault-tolerant switch bridge arms and one open winding electric machine composition.Each six switch fulls inverter power switch is different to be opened Off status generates different space voltage vectors, the space voltage vector that two six switch full inverters export respectively, such as table 1 It is shown.
The space voltage vector of two full-bridge inverters output of the healthy inverter of table 1
By table 1 it is recognised that each six switch fulls inverter can with the output phase with 8 space voltage vectors, wherein There are two be zero vector.In order to represent different voltage vectors, only with S1, S3, the on off state of S5 power switch can table Show the output space voltage vector (1,2,3,4,5,6,7,8) of first full-bridge inverter, similarly, with S7, S9, S11 power is opened The on off state of pass represents the output space voltage vector (1 ', 2 ', 3 ', 4 ', 5 ', 6 ', 7 ', 8 ') of second full-bridge inverter. Distribution of the space voltage vector of two six switch full inverters output in two-dimensional space vector plane is as shown in Figure 8.
Winding three-phase electric system is opened for 12 switching inverters, the process of the space voltage vector of inverter output is not The blended space voltage vector of system can be obtained with combination, that is, is ultimately applied to out the threephase stator of winding permanent magnet synchronous motor Space voltage vector on winding.As shown in table 2, system can synthesize 64 space voltage vectors, they are sweared in two-dimensional space It is respectively distributed in amount plane on 19 positions.Specific vector distributing position is as shown in Figure 9.
The blended space voltage vector of the healthy inverter output of table 2
In the case where opening 12 switching inverter operating mode of phase winding three phase electric machine, Fault tolerant inverter will be different according to 4 kinds Fault mode carries out the reconstruct of topological structure.Inverter topology after reconstruct is 12 switching inverter of three phase electric machine or three Eight switching inverter of phase motor.As shown in figure 4, when inverter is under working healthily state, all two-way switch are all disconnected Open state, therefore, two fault-tolerant switch bridge arms are in unactivated state, only normal six work bridge arm driving motor.This When, system, which works in, conventional opens 12 switching inverter drive pattern of winding three-phase motor.As shown in figure 5, when in inverter Any one inverter work bridge arm when breaking down, such as after the bridge arm Bra that works breaks down, rapid fuse Fa or F1 (F2) disconnect, work bridge arm Bra exits operating mode, and controller stops the trigger pulse of power switch S1 and S2.Meanwhile it controls Device triggering bidirectional thyristor TRa conductings, winding A one end a are directly connected to the midpoint Nf1 of fault-tolerant bridge arm Bf1.It is at this point, fault-tolerant inverse Become device other structures not change.New system is still operated in out under 12 switching inverter pattern of winding three-phase motor.Hold Wrong inverter realizes a topological structure reconstruct when work bridge arm Bra breaks down, and ensures the sustainable operation of system Ability.After system any one bridge arm breaks down, system can carry out faults-tolerant control by processing mode similar to the above.Such as Shown in Fig. 6, when inverter two inverters work bridge arm Bra and Brz break down simultaneously when, rapid fuse Fa (F5 or F6) disconnected with Fz (F7 or F8), work bridge arm Bra and Brz exit operating mode, controller stop power switch S1, S2, S7 and The trigger pulse of S8.Meanwhile controller triggering bidirectional thyristor TRa and TRz conducting, winding A one end a are directly connected to fault-tolerant bridge The midpoint Nf1 of arm Bf1, winding C one end z are directly connected to the midpoint Nf2 of fault-tolerant bridge arm Bf2.In this way, two ports of winding A and C A and c is connected respectively on corresponding fault-tolerant bridge arm, and port voltage is controlled respectively by fault-tolerant bridge arm Bf1 and Bf2.At this point, Fault tolerant inverter other structures do not change.New system is operated in out 12 switching inverter pattern of winding three-phase phase motor Under.Fault tolerant inverter realizes the topological structure reconstruct of two work bridge arm Bra and Brz when breaking down simultaneously, and ensure be The sustainable operation ability of system.When two inverters work bridge arm that two ports of system difference winding are connected occurs simultaneously After failure, system can carry out faults-tolerant control by processing mode similar to the above.
As shown in fig. 6, when the work of two inverters the bridge arm Bra and Brx that the both ends of same winding A are connected occur simultaneously During failure, rapid fuse Fa (F5 or F6) and Fx (F11 or F12) are disconnected, and work bridge arm Bra and Brx exit operating mode, control Device processed stops the trigger pulse of power switch S1, S2, S11 and S12.Meanwhile controller triggering bidirectional thyristor TRa and TRx are led Logical, winding A one end a are directly connected to the midpoint Nf1 of fault-tolerant bridge arm Bf1, and winding A one end x are directly connected to fault-tolerant bridge arm Bf2's Midpoint Nf2.In this way, two ports of winding A are connected on fault-tolerant bridge arm, port voltage respectively by fault-tolerant bridge arm Bf1 and Bf2 into Row control.At this point, Fault tolerant inverter other structures do not change.New system is operated in out the switch of winding three-phase phase motor 12 Under inverter pattern.Fault tolerant inverter realizes topological structure weight when two work bridge arm Bra and Brx break down simultaneously Structure, and ensure the sustainable operation ability of system.When two work bridge arms that system any one machine winding is connected simultaneously After breaking down, system can carry out faults-tolerant control by processing mode similar to the above.
As shown in fig. 7, when occurring any two or three work in three of inverter I work bridge arm Bra, Brb and Brc When bridge arm breaks down simultaneously, rapid fuse Fa (F1 or F2), Fb (F3 or F4) and Fc (F5 or F6) are disconnected, and work bridge arm Bra, Brb and Brc exit operating mode, and controller stops the trigger pulse of power switch S1, S2, S3, S4, S5, S6.Meanwhile Controller triggering bidirectional thyristor TRa, TRb and TRc conducting, winding A one end a are directly connected to the midpoint of fault-tolerant bridge arm Bf1 Nf1, winding B one end b are directly connected to the midpoint Nf1 of fault-tolerant bridge arm Bf1, and winding C one end c are directly connected to fault-tolerant bridge arm Bf1 Midpoint Nf1.At this point, motor forms points of common connection, while voltage of changing the time will be controlled by fault-tolerant bridge arm Bf1.It is fault-tolerant inverse The structure for becoming device other parts does not change.New system by by before open 12 switching inverter pattern of winding three-phase motor It is switched under eight switching inverter pattern of star winding three phase electric machine.Fault tolerant inverter realizes three work bridge arms Bra, Brb Topological structure reconstruct when breaking down simultaneously with Brc, and ensure the sustainable operation ability of system.Any group of inverter After three work bridge arms break down, system can carry out faults-tolerant control by processing mode similar to the above.
The Fault tolerant inverter system of the present invention can realize the reconstruct of system topology under different fault conditions.Weight Fault tolerant inverter topological structure after structure connects six switch full inverter topologies for star winding, and wherein star winding connects It connects common point voltage and will be controlled by fault-tolerant bridge arm.The space voltage vector that new topological structure inverter can export, such as 3 institute of table Show.
Specific vector distributing position is as shown in Figure 8.
The space voltage vector of inverter output is reconstructed after 3 bridge arm failure of table
System fault tolerance mechanism is：When any one switch bridge arm breaks down, such as short trouble, with failure bridge arm phase Fuse even or the fuse being connected with winding fuse since the phase current is excessive.The electricity being connected simultaneously with the failure bridge arm Flow sensor can check super-high-current, and controller detects the abnormal current and stops failure bridge arm two after making breakdown judge The trigger electrode signal of a switch, failure bridge arm will be isolated out system.Guarantee is connected to the machine winding of failure bridge arm simultaneously Port works normally, and the bidirectional thyristor control pole being connected to the fault-tolerant bridge arm of inverter of redundancy sends Continuity signal.So Failure bridge arm is stopped and is disconnected with the armature winding port being connected.Failure bridge arm for armature winding port pass through Bidirectional thyristor is connected on the midpoint of fault-tolerant bridge arm.Occurs a bridge arm failure when any one group in this two groups of bridge arms or simultaneously When, which will be isolated out system, and the machine winding port being correspondingly connected with is connected to fault-tolerant bridge arm midpoint, at this point, being System be still operated in it is traditional open 12 switching inverter type of drive of winding electric machine, as shown in Figure 5；When any one group of bridge arm goes out When showing two or whole bridge arm failures, this group of bridge arm will all isolate system, the machine winding three of corresponding connection A port is all connected to the midpoint of fault-tolerant bridge arm.At this point, system topology is driven by opening 12 switching inverter of winding electric machine Dynamic system is switched to the eight switching inverter drive system of star winding motor with the control of winding mid-point voltage.System is opened up newly Steady operation can be continued by flutterring under structure, relatively original structure, which has suppression common mode component of voltage, reduce power switch The advantages of number；Simultaneously as winding connection common point may be under inverter effectively control, the topological structure is also into one Step has new failure tolerance.I.e. any phase winding or power bridge arm failure can utilize winding connection common point to be connected Switch bridge arm carry out faults-tolerant control.
The specific fault tolerant control method of present system is：
(1) current sensor detection three-phase stator winding phase current I is utilizeda, Ib, IcWith phase voltage Va, Vb, Vc.According to it Judge motor system fault Status Flag F.
(2) when electric system normal health works, F=0.Six bidirectional thyristors (TRa, TRb, TRc, TRx, TRy, TRz triggering terminal voltage signal) is TRa=TRb=TRc=TRx=TRy=TRz=0.Fault tolerant inverter only six service bridges Arm Bra, Brb, Brc, Brx, Bry, Brz are in running order, and fault-tolerant bridge arm Bf1, Bf2 are in off position.System works Under three phase electric machine vector control mode.Each bridge arm midpoint output current of inverter is：
IsFor reference current amplitude, INa、INb、INc、INx、INy、INzIt is flowed to for six work bridge arm midpoints of system inverter The electric current of motor, INf1、INf2The electric current of motor is flowed to for two fault-tolerant bridge arm midpoints of system inverter, θ is angle of rotor of motor.
At this point, effective phase voltage that each bridge arm of inverter is output to motor two-phase stator winding is：
VmFor output voltage amplitude, VNa-NxFor the output between the midpoint Nx of inverter leg Bra midpoint Na and bridge arm Brx Voltage, VNb-NyFor the output voltage between the midpoint Ny of inverter leg Brb midpoint Nb and bridge arm Bry.
(3) when electric system inverter leg Bra failures, failure includes bridgc arm short or open circuit.At this point, F=1,
TRa=1, TRb=TRc=TRx=TRy=TRz=0.Only five work bridge arm Brb, Brc of Fault tolerant inverter, Brx, Bry, Brz are in running order, and fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work.System is operated in three-phase Under motor vector control mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(4) when electric system inverter leg Brb failures, failure includes bridgc arm short or open circuit.At this point, F=2, TRb =1, TRa=TRc=TRx=TRy=TRz=0.At Fault tolerant inverter only five work bridge arms Bra, Brc, Brx, Bry, Brz In working condition, fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work.System is operated in three phase electric machine vector controlled Under mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(5) when electric system inverter leg Brc failures, failure includes bridgc arm short or open circuit.At this point, F=3, TRc =1, TRa=TRb=TRx=TRy=TRz=0.At Fault tolerant inverter only five work bridge arms Bra, Brb, Brx, Bry, Brz In working condition, fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work.System is operated in three phase electric machine vector controlled Under mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(6) when electric system inverter leg Brx failures, failure includes bridgc arm short or open circuit.At this point, F=4, TRx =1, TRa=TRb=TRc=TRy=TRz=0.At Fault tolerant inverter only five work bridge arms Bra, Brb, Brc, Bry, Brz In working condition, fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.System is operated in three phase electric machine vector controlled Under mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(7) when electric system inverter leg Bry failures, failure includes bridgc arm short or open circuit.At this point, F=5, TRy =1, TRa=TRb=TRc=TRx=TRz=0.At Fault tolerant inverter only five work bridge arms Bra, Brb, Brc, Brx, Brz In working condition, fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.System is operated in three phase electric machine vector controlled Under mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(8) when electric system inverter leg Brz failures, failure includes bridgc arm short or open circuit.At this point, F=6, TRz =1, TRa=TRb=TRc=TRx=TRy=0.At Fault tolerant inverter only five work bridge arms Bra, Brb, Brc, Brx, Bry In working condition, fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.System is operated in three phase electric machine vector controlled Under mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
(9) when any two in electric system inverter leg Bra, Brb, Brc or whole bridge arms break down, failure Including bridgc arm short or open circuit.At this point, F=7.Eight bridge arm working condition such as following tables of inverter：
Wherein, F representing faults state, H represent health status.
At this point, TRa=TRb=TRc=1, TRx=TRy=TRz=0.Only three work bridge arm Brx of Fault tolerant inverter, Bry, Brz are in running order, and fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work.System is operated in three phase electric machine Under vector control mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
Under the fault-tolerant mode, machine winding becomes star-like connection mode from opening winding connection.Due to fault-tolerant bridge arm Bf1 midpoints Nf1 is directly connected on motor star winding common point, therefore, fault-tolerant bridge arm Bf1 mid-point voltages VNf1Equal to three-phase Motor common-mode voltage component V0=(VNx-Nf1+VNy-Nf1+VNz-Nf1)/3.Motor star winding common point voltage will be controlled by fault-tolerant Bridge arm Bf1, at this point, motor common-mode voltage component will be effectively suppressed.
(10) when any two in electric system inverter leg Brx, Bry, Brz or whole bridge arms break down, therefore Barrier includes bridgc arm short or open circuit.At this point, F=8.Eight bridge arm working condition such as following tables of inverter：
At this point, TRa=TRb=TRc=0, TRx=TRy=TRz=1.Only three work bridge arm Bra of Fault tolerant inverter, Brc, Brc are in running order, and fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work.System is operated in three phase electric machine Under vector control mode.Each bridge arm midpoint output current of inverter is：
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
Under the fault-tolerant mode, machine winding becomes star-like connection mode from opening winding connection.Due to fault-tolerant bridge arm Bf2 midpoints Nf2 is directly connected on motor star winding common point, therefore, fault-tolerant bridge arm Bf2 mid-point voltages VNf2Equal to three-phase Motor common-mode voltage component V0=(VNa-Nf2+VNb-Nf2+VNc-Nf2)/3.Motor star winding common point voltage will be controlled by fault-tolerant Bridge arm Bf2, at this point, motor common-mode voltage component will be effectively suppressed.

Claims (8)

1. one kind opens winding three-phase motor fault-tolerant system, it is characterised in that：Current input terminal a, b, c are formed including opening common point Armature winding is separately positioned on open the winding electric machine M, the current input terminal a and current output terminal x of current output terminal x, y, z The both ends of A, current input terminal b and current output terminal y are separately positioned on the both ends of armature winding B, and current input terminal c and electric current are defeated Outlet z is separately positioned on the both ends of armature winding C；Current input terminal a, b, c and current output terminal x, y, z connect inverter respectively Work bridge arm Bra, Brb, Brc, Brz, Bry, Brx；Inverter work bridge arm Bra, Brb, Brc and the fault-tolerant bridge of inverter in parallel Arm Bf1 forms inverter I, and inverter work bridge arm Brz, Bry, Brx and inverter in parallel hold bridge arm Bf2 composition inverters II；A points of the current input terminal of the armature winding A is two-way, and a-road-through crosses quick fuse fuse Fa and inverter leg Bra Midpoint Na be connected, another way is connected by bidirectional thyristor TRa with the midpoint Nf1 of the fault-tolerant bridge arm Bf1 of inverter；Armature winding X points of the current output terminal of A is two-way, and a-road-through crosses quick fuse fuse Fx and is connected with the midpoint Nx of inverter leg Brx, separately It is connected all the way by bidirectional thyristor TRx with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of inverter；The electric current input of the armature winding B B points are held as two-way, a-road-through crosses quick fuse fuse Fb and is connected with the midpoint Nb of inverter leg Brb, and another way passes through double It is connected to thyristor TRb with the midpoint Nf1 of the fault-tolerant bridge arm Bf1 of inverter；Current output terminal y points of armature winding B are two-way, one Road is connected by quick fuse fuse Fy with the midpoint Ny of inverter leg Bry, another way by bidirectional thyristor TRy with it is inverse The midpoint Nf2 for becoming the fault-tolerant bridge arm Bf2 of device is connected；C points of the current input terminal of the armature winding C is two-way, and a-road-through is excessively quick Fuse wire Fc is connected with the midpoint Nc of inverter leg Br3, and another way passes through bidirectional thyristor TRc and the fault-tolerant bridge of inverter The midpoint Nf1 of arm Bf1 is connected, and z points of current output terminal is two-way, and a-road-through crosses quick fuse fuse Fz and inverter leg The midpoint Nz of Brz is connected, and another way is connected by bidirectional thyristor TRz with the midpoint Nf2 of the fault-tolerant bridge arm Bf2 of inverter；It is described Inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx and inverter fault-tolerant bridge arm Bf1, Bf2 on be respectively arranged with Two power switch pipes, each power switch pipe and bidirectional thyristor TRa, TRb, TRc, TRx, Try, TRz difference Connect controller.
2. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Current input terminal a, b, c institute Connect the power switch pipe and bidirectional thyristor on inverter work bridge arm Bra, Brb, Brc and fault-tolerant bridge arm Bf1 of inverter TRa, TRb, TRc connect controller CON1, current output terminal x, y, z connect inverter work bridge arm Brz, Bry, Brx with it is inverse Become the power switch pipe and bidirectional thyristor TRx, Try, TRz connection controller CON2 on the fault-tolerant bridge arm Bf2 of device.
3. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Controller CON1 passes through electric current Sensor detects the electric current of current input terminal a, b, c respectively；Controller CON2 detects electric current output by current sensor respectively Hold the electric current of x, y, z.
4. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Inverter work bridge arm Bra, Two power switch pipes on Brb, Brc, Brz, Bry, Brx are connected a fuse wire respectively.
5. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Inverter work bridge arm Bra, Power switch pipe on Brb, Brc, Brz, Bry, Brx and inverter fault-tolerant bridge arm Bf1, Bf2 uses IGBT or MOSFET.
6. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Inverter work bridge arm Bra, Brb, Brc, Brz, Bry, Brx backward dioded in parallel with the power switch pipe on inverter fault-tolerant bridge arm Bf1, Bf2.
7. according to claim 1 open winding three-phase motor fault-tolerant system, it is characterised in that：Described opens winding electric machine M Permanent magnet synchronous motor, brshless DC motor or the AC induction motor opened using star winding points of common connection.
8. a kind of control method for opening winding three-phase motor fault-tolerant system as described in claim 1, which is characterized in that including step Suddenly：
1) the three-phase stator winding phase current I of winding electric machine M is opened in detectiona, Ib, IcWith phase voltage Va, Vb, Vc；
Motor system fault Status Flag F is judged according to testing result：
2) when electric system normal health works, F=0, the triggering end of bidirectional thyristor TRa, TRb, TRc, TRx, TRy, TRz Voltage signal is TRa=TRb=TRc=TRx=TRy=TRz=0, inverter work bridge arm Bra, Brb, Brc, Brx, Bry, Brz is in running order, and inverter fault-tolerant bridge arm Bf1, Bf2 are in off position；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
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In formula, IsFor reference current amplitude, INa、INb、INc、INx、INy、INzMotor is flowed to for six work bridge arm midpoints of inverter Electric current, INf1、INf2The electric current of motor is flowed to for the fault-tolerant bridge arm midpoint of two inverters, θ is angle of rotor of motor；
At this point, effective phase voltage that each bridge arm of inverter is output to motor two-phase stator winding is：
<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>
V in formulamFor output voltage amplitude, VNa-NxBetween inverter leg Bra midpoint Na and inverter leg Brx midpoint Nx Output voltage, VNb-NyFor the output voltage between inverter leg Brb midpoint Nb and inverter leg Bry midpoint Ny；
3) when inverter leg Bra failures, failure includes bridgc arm short or open circuit, F=1, TRa=1, TRb=TRc=TRx =TRy=TRz=0, five inverter work bridge arms Brb, Brc, Brx, Bry, Brz are in running order, the fault-tolerant bridge of inverter Arm Bf1 is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
4) when electric system inverter leg Brb failures, failure includes bridgc arm short or open circuit, F=2, TRb=1, TRa= TRc=TRx=TRy=TRz=0, five inverter work bridge arms Bra, Brc, Brx, Bry, Brz are in running order, inversion The fault-tolerant bridge arm Bf1 of device is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
5) when electric system inverter leg Brc failures, failure includes bridgc arm short or open circuit, F=3, TRc=1, TRa= TRb=TRx=TRy=TRz=0, five inverter work bridge arms Bra, Brb, Brx, Bry, Brz are in running order, inversion The fault-tolerant bridge arm Bf1 of device is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>
6) when electric system inverter leg Brx failures, failure includes bridgc arm short or open circuit, F=4, TRx=1, TRa= TRb=TRc=TRy=TRz=0, Fault tolerant inverter only five work bridge arm Bra, Brb, Brc, Bry, Brz are in work shape State, fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
7) when electric system inverter leg Bry failures, failure includes bridgc arm short or open circuit, F=5, TRy=1, TRa= TRb=TRc=TRx=TRz=0, five inverter work bridge arms Bra, Brb, Brc, Brx, Brz are in running order, inversion The fault-tolerant bridge arm Bf2 of device is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
8) when electric system inverter leg Brz failures, failure includes bridgc arm short or open circuit, F=6, TRz=1, TRa= TRb=TRc=TRx=TRy=0, five inverter work bridge arms Bra, Brb, Brc, Brx, Bry are in running order, inversion The fault-tolerant bridge arm Bf2 of device is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
9) when any two in electric system inverter leg Bra, Brb, Brc or whole bridge arms break down, failure includes Bridgc arm short or open circuit, F=7, eight bridge arm working condition such as following tables of inverter：
Wherein, F representing faults state, H represent health status；
At this point, TRa=TRb=TRc=1, TRx=TRy=TRz=0；Only three work bridge arm Brx, Bry of Fault tolerant inverter, Brz is in running order, and fault-tolerant bridge arm Bf1 is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>5</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>x</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>y</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>z</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
Under the fault-tolerant mode, machine winding becomes star-like connection mode, the fault-tolerant bridge arm Bf1 of inverter from opening winding connection Midpoint Nf1 is directly connected on machine winding common point, the fault-tolerant bridge arm Bf1 mid-point voltages V of inverterNf1It is total to equal to three phase electric machine Mode voltage component V0=(VNx-Nf1+VNy-Nf1+VNz-Nf1)/3, machine winding common point voltage will be controlled by fault-tolerant bridge arm Bf1, this When motor common-mode voltage component will be effectively suppressed；
10) when any two in electric system inverter leg Brx, Bry, Brz or whole bridge arms break down, failure includes Bridgc arm short or open circuit, F=8, eight bridge arm working condition such as following tables of inverter：
At this point, TRa=TRb=TRc=0, TRx=TRy=TRz=1, only three work bridge arm Bra, Brc of Fault tolerant inverter, Brc is in running order, and fault-tolerant bridge arm Bf2 is in running order, other bridge arms do not work；
System is operated under three phase electric machine vector control mode, and each bridge arm midpoint output current of inverter is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>b</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mi>s</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>y</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>z</mi> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>1</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>I</mi> <mrow> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
At this point, effective phase voltage that each bridge arm of inverter is output to motor threephase stator winding is：
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>a</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&amp;theta;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>b</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>cos</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>-</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>V</mi> <mrow> <mi>N</mi> <mi>c</mi> <mo>-</mo> <mi>N</mi> <mi>f</mi> <mn>2</mn> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mi>m</mi> </msub> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;theta;</mi> <mo>+</mo> <mn>2</mn> <mi>&amp;pi;</mi> <mo>/</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
Under the fault-tolerant mode, machine winding becomes star-like connection mode, the fault-tolerant bridge arm Bf2 of inverter from opening winding connection Midpoint Nf2 is directly connected on machine winding common point, the fault-tolerant bridge arm Bf2 mid-point voltages V of inverterNf2It is total to equal to three phase electric machine Mode voltage component V0=(VNa-Nf2+VNb-Nf2+VNc-Nf2)/3, machine winding common point voltage will be controlled by the fault-tolerant bridge arm of inverter Bf2, at this point, motor common-mode voltage component is inhibited.
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CN108964573A (en) * 2018-07-17 2018-12-07 河南森源重工有限公司 Open winding three-phase electric system and fault-tolerant driving circuit
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CN109428536A (en) * 2018-09-06 2019-03-05 河南森源重工有限公司 One kind opening winding electric machine system and driving circuit
CN109510503A (en) * 2018-12-21 2019-03-22 博众精工科技股份有限公司 A kind of highly reliable, redundancy inverter circuit
CN109870639A (en) * 2019-03-04 2019-06-11 合肥工业大学 One kind opening winding electric drive converter system switching tube open-circuit fault diagnostic method
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