CN101272125A

CN101272125A - Motor drive system with fault tolerance function

Info

Publication number: CN101272125A
Application number: CNA2008101042881A
Authority: CN
Inventors: 赵峰; 温旭辉; 郭希铮; 郭新华; 范涛; 宋雪雷
Original assignee: Institute of Electrical Engineering of CAS
Current assignee: Institute of Electrical Engineering of CAS
Priority date: 2008-04-17
Filing date: 2008-04-17
Publication date: 2008-09-24
Anticipated expiration: 2028-04-17
Also published as: CN101272125B

Abstract

A motor drive system with a fault tolerance function comprises an inverter and a motor; the motor can be an asynchronous motor, a permanent magnet motor or a reluctance motor; the stator of the motor is provided with a plurality of sets of windings to lead out four terminals U, V, W and O; wherein, the windings connected by any three terminals can form a rotating magnetic field in a motor air gap by inputting current. The inverter is a three-phase full-bridge inverter which simultaneously leads out a DC neutrality point N; the leding-out ends A, B and C of the three bridge arms of the inverter and the DC neutrality point N are connected with the four leding-out terminals U, V, W and O of the motor. When any phase of the motor drive system of the invention is wrong, the fault tolerance control can be realized by simply changing control algorithm without needing a hardware switch to participate in; a fault tolerance operation state without needing stopping the machine can also be fast entered.

Description

A kind of motor driven systems with fault tolerance

Technical field

The present invention relates to a kind of motor driven systems with high reliability.

Background technology

Motor windings and converters are the weak links that easily breaks down in the drive system.Therefore in case one of them breaks down, whole system will be lost the ability of operate as normal, and this can bring economic loss in general civilian occasion, and in important events such as aviation, military affairs, will cause catastrophic failure, and it is great to carry out the fault-tolerant Research Significance of electricity generation system.Common measure provides redundant motor windings or controller, and such system cost and volume all can be very big, inapplicable to the higher occasion of volume requirement.At most common failures such as the open circuit of power switch or short circuits, in the article " study of Direct Torque Control of error-tolerance type four switch three-phase inverter asynchronous generating systems " (" Proceedings of the CSEE ", 2005 18 phases, Zhang Lanhong Hu Yuwen), a kind of fault-tolerance approach has been proposed: open failure switch place brachium pontis, six switch three-phase inverters are reconstructed into four switch three-phase inverters,, make system continue operation again by adjustment to control strategy.The shortcoming of this scheme is can only be for converters provides redundant, and motor windings is damaged, and system can't work equally; Secondly this scheme need judge which is out of order mutually, thereby realizes the fault-tolerant control of failure system by switch, and control is complicated, increases system cost and volume simultaneously; Owing to need realize fault-tolerant control by switch, real-time is relatively poor, and failure recovery time is long, is difficult to satisfy the demand of the high occasion of some needs real-times.How on the basis that does not increase system bulk and cost, improve system survivability and reliability is a difficult problem always.

Summary of the invention

It is low to the objective of the invention is to solve existing electric system fault-tolerant ability, the fault-tolerant networks complicated problems.Proposed a kind of novel motor driven systems, this drive system adopts three-phase inverter to constitute, and has fault-tolerant ability preferably, the reliability height, and also system cost is low, and simple in structure, volume is little.

Drive system of the present invention comprises an inverter and a motor.

Motor wherein of the present invention can be a magneto, or asynchronous machine, or reluctance motor.Different with traditional three phase electric machine, motor stator of the present invention has many cover windings, but only goes out 4 leading-out terminals.And satisfied wherein any three windings that terminal connected pass to suitable electric current and just can form rotating magnetic field in air gap.

Wherein inverter adopts traditional three-phase full-bridge inverter, draws the DC point simultaneously, and inverter can be drawn 4 terminals like this, links to each other with above-mentioned motor.So, native system constitutes a motor driven systems, when wherein any one going wrong mutually, can realize fault-tolerant control by simple control algolithm change, need not hardware switch and participates in, and need not to shut down to enter the fault-tolerant operation state rapidly.

The invention has the beneficial effects as follows: the drive system of this high reliability, adopt the hardware of simple three-phase bridge inverter, under the prerequisite that does not significantly increase system bulk, weight and control difficulty, utilize simple control algolithm to change, effectively improve the reliability and security of drive system.The present invention can provide redundant mutually for any one of motor, and simultaneous faults is very short recovery time.

Description of drawings

Fig. 1 is traditional three phase electric machine drive system schematic diagram;

Fig. 2 is one of specific embodiment of the invention schematic diagram;

Fig. 3 is two schematic diagrames of the specific embodiment of the invention.

Embodiment

Further specify the present invention below in conjunction with the drawings and specific embodiments.

Figure 1 shows that traditional three phase electric machine drive system.Three brachium pontis of inverter are drawn three terminal A respectively, B, and C, with three leading-out terminal U of three phase electric machine, V, W is connected, and three phase windings pass to electric current and form rotating magnetic field, drive motors work.When wherein any one motor windings or any one brachium pontis fault of inverter, system quits work immediately.

Shown in Figure 2 is one of specific embodiments of the present invention.In this system, directly draw the neutral point N of DC power supply, with the exit A of three brachium pontis, B, C are the motor power supply together.And the method that the motor stator in this example adopts four phase winding stars to connect constitutes one four phase motor, the exit A of three brachium pontis of four phase motors and inverter, and B, C and neutral point N link to each other.According to Kirchhoff's theorem as can be known, the electric current in any times four phase winding and be zero.During operate as normal, by control OU, the electric current in the OV, OW phase winding reaches the purpose of controlling OX phase winding electric current, makes and forms rotating magnetic field, drive motors work in the motor gas-gap.Suppose OU phase motor windings fault, by control OV, the electric current in the OW winding reaches the purpose of controlling the OX winding current, makes and forms rotating magnetic field, drive motors operate as normal in the motor gas-gap.Same supposition inverter A phase fault, by control OV, the electric current in the OW winding reaches the purpose of controlling the OX winding current, makes and forms rotating magnetic field, drive motors operate as normal in the motor gas-gap.Same, other any phase faults, system can operate as normal, and reliability is compared traditional three-phase system and is had increased significantly, and the required change of system is very little.

Shown in Figure 3 is another embodiment of the present invention.In this system, the dc bus of inverter supports electric capacity and adopts two identical capacitor C 1, the C2 series connection, and with two capacitor C 1, neutral point N is drawn in C2 series connection place, and with the exit A of three brachium pontis, B, C are the motor power supply together.And the motor stator in the present embodiment adopts six cover windings to link to each other, and forms tetrahedral six ribs, and four fixed points are as leading-out terminal U, V, and W, O constitutes a polyphase machine, respectively with the exit A of three brachium pontis of inverter, B, C and neutral point N are continuous.According to Kirchhoff's theorem as can be known, any times six overlap the electric current in the winding and are zero.During operate as normal, by control OU, the electric current in the OV, OW phase winding reaches control UV, VW, and the purpose of WU phase winding electric current makes and forms rotating magnetic field, drive motors work in the motor gas-gap.Suppose OU phase motor windings fault, motor becomes UV, VW, WU phase corner connection winding and OV, VW, the motor that WO phase corner connection winding constitutes is by control UV, VW, WU phase corner connection winding and OV, electric current in the VW, WO phase corner connection winding makes and forms rotating magnetic field, drive motors operate as normal in the motor gas-gap.Same supposition inverter A phase fault, winding UW, UV, UO can't power mutually, and by control OV, the electric current in the VW, WO phase corner connection winding makes and forms rotating magnetic field, drive motors operate as normal in the motor gas-gap.Same, other any phase faults, system can operate as normal, and reliability is compared traditional three-phase system and is had increased significantly, and the required change of system is very little.

The present invention only makes simple change to system hardware, constancy of volume, and cost is lower simultaneously, and reliability is greatly improved, and has important practical value.

Claims

1, a kind of motor driven systems with fault tolerance, it is characterized in that comprising an inverter and a motor, motor is asynchronous machine, magneto or reluctance motor, its stator has many cover windings, draw 4 terminal U, V, W, O, wherein any three windings that terminal connected pass to electric current and just can form rotating magnetic field in motor gas-gap; Inverter is a three-phase full-bridge inverter, draws DC point N simultaneously, the exit A of three brachium pontis of inverter, and B, C and DC point N, with 4 leading-out terminal U of motor, V, W, O links to each other.

2, the motor driven systems with fault tolerance according to claim 1 is characterized in that the method that adopts four phase winding stars to connect constitutes one four phase motor, 4 leading-out terminal U of four phase motors, V, W, the exit A of three brachium pontis of O and inverter, B, C and DC point N link to each other.

3, the motor driven systems with fault tolerance according to claim 1 is characterized in that motor adopts six cover windings to link to each other, and forms tetrahedral six ribs, and four fixed points are as leading-out terminal U, V, and W, O constitutes a polyphase machine; The dc bus of inverter supports electric capacity and adopts two identical capacitor C 1, the C2 series connection, and with two capacitor C 1, neutral point N is drawn in C2 series connection place; The leading-out terminal U of motor, V, W, O respectively with the exit A of three brachium pontis of inverter, B, C and neutral point N link to each other.