A system and method for reconstructing a missing phase of a matrix motor

Abstract

The application discloses a kind of matrix motor's short phase reconstruction system and reconstruction method, belong to motor drive system technical field, the midpoint of each phase bridge arm of matrix motor stator and rotor power inverter is connected by bidirectional switch, when the power device of certain bridge arm in inverter occurs open circuit fault, the fault phase bridge arm is locked, simultaneously, the still healthy winding corresponding to the fault phase bridge arm is switched to the midpoint of other normal bridge arm by the action of bidirectional switch, by the form of bridge arm reuse, uninterrupted fault-tolerant operation of matrix motor system under power device fault is realized.The drive circuit topology and reconstruction method with short phase reconstruction ability provided by the application can maximize the use of healthy phase winding of matrix motor under power device fault condition, realize uninterrupted fault-tolerant operation, and improve the output performance of motor electromagnetic torque after fault.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor drive systems, and particularly relates to a matrix motor open-phase reconstruction system and a reconstruction method. BACKGROUND

[0002] The matrix motor is a kind of magnetic field modulation motor, which is different from the conventional magnetic field modulation motor in that multiple redundant magnetic sources are arranged inside the matrix motor, that is, magnetic steels and multi-phase armature windings are distributed on the stator and the rotor. The armature windings on the stator and the rotor of the matrix motor can interact with the magnetic steels on the stator and the rotor, respectively, to generate multiple magnetic field modulation effects, and then output multiple torque components distributed in a matrix form. Due to the characteristics of the multiple magnetic sources, the matrix motor has strong fault tolerance, and the multiple torque components distributed in a matrix form significantly improve the torque density of the motor, so the matrix motor has great application potential in occasions such as electric vehicles and more / electric aircrafts, which have high requirements for power density, reliability and safety of motor systems.

[0003] At present, the main reasons for open-circuit faults of motor systems include open-circuit of power devices, bridge arm fusing caused by short-circuit of power devices and open-phase fault of motor armature windings. The existing open-circuit fault tolerance control strategy of the matrix motor can be summarized as reconstruction of torque components, that is, when the stator or rotor winding has an open-phase fault or the corresponding bridge arm has a power device fault, the matrix motor can cut off the fault unit, continue to generate healthy torque components through the remaining healthy components or the remaining healthy phases, and then continuously output torque. This fault tolerance control strategy is similar to the idea of maintaining the magnetic motive force unchanged by reconstructing the remaining healthy phase currents of the multi-phase motor.

[0004] The limitation of the existing matrix motor open-circuit fault tolerance control strategy mainly manifests that the remaining healthy components of the motor are not fully and sufficiently utilized, and then the control performance of the system is reduced. Among the reasons for open-circuit faults, the probability of power device faults is relatively high, and the probability of open-phase faults of motor armature windings is relatively low. For the existing matrix motor fault tolerance control method, when a few phase bridge arm power devices have open-circuit faults (for a few phase bridge arm open-circuit faults, the remaining windings can still generate rotating magnetic potential after blocking these bridge arms), the bridge arm where the power device is located is directly blocked, so that the normal phase windings connected with the fault bridge arm are also blocked. The control performance of the system is reduced. The remaining windings are not symmetrical in space, and the reconstructed electromagnetic torque also has a certain degree of pulsation. SUMMARY

[0005] In view of the limitations of the above-mentioned existing methods, the present patent is aimed at the open-circuit fault of the power device which accounts for the largest proportion in the fault condition, and provides a matrix motor phase loss reconstruction system and a reconstruction method, which realizes uninterrupted fault-tolerant operation of the matrix motor system under power device failure, maximally utilizes the healthy phase winding of the matrix motor under power device failure condition, and improves the output performance of the electromagnetic torque of the motor after failure.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a matrix motor phase loss reconstruction system, which comprises a stator j-phase inverter, a rotor k-phase inverter, a j-phase stator winding, a k-phase rotor winding, a stator bidirectional switch group and a rotor bidirectional switch group.

[0008] The stator j-phase inverter comprises j first bridge arms; each first bridge arm comprises an upper power device and a lower power device, the collector of the upper power device is connected with the positive electrode of a DC power supply, the emitter of the upper power device is connected with the collector of the lower power device, forming a first bridge arm midpoint, and the first end of the j-phase stator winding is connected with the midpoint of each first bridge arm; the emitter of the lower power device is connected with the negative electrode of the DC power supply.

[0009] The rotor k-phase inverter comprises k second bridge arms which have the same structure as the first bridge arms; the midpoints of the k second bridge arms are connected with the first end of the k-phase rotor winding, respectively.

[0010] Each first bridge arm midpoint is connected with all second bridge arm midpoints through the stator bidirectional switch group and the rotor bidirectional switch group.

[0011] The j-phase stator winding is a star-connected matrix motor stator armature winding, and the second end of each phase stator winding is connected together; the k-phase rotor winding is a star-connected matrix motor rotor armature winding, and the second end of each phase rotor winding is connected together.

[0012] Further, the stator bidirectional switch group comprises j stator bidirectional switches, and the rotor bidirectional switch group comprises k rotor bidirectional switches; one end of the j stator bidirectional switches and one end of the k rotor bidirectional switches are connected together, the other end of the j stator bidirectional switches is connected with the midpoint of each first bridge arm, respectively; and the other end of the k rotor bidirectional switches is connected with the midpoint of each second bridge arm, respectively.

[0013] Further, the power device is an insulated gate bipolar transistor.

[0014] Further, the connection is made by cables, soft copper wires, copper busbars or other conductors.

[0015] Further, the stator bidirectional switch and the rotor bidirectional switch are bidirectional thyristors or solid-state relays.

[0016] Further, the direct current power supply is a direct current bus power supply.

[0017] In a second aspect, the application provides a matrix motor phase reconstruction method based on the above phase reconstruction system, comprising:

[0018] When the power device of a certain bridge arm in the stator j-phase inverter or the rotor k-phase inverter is open-circuit fault, the fault phase bridge arm is blocked, and at the same time, the still healthy winding corresponding to the fault phase bridge arm is switched to the midpoint of the other normal bridge arm through the action of the stator bidirectional switch group and the rotor bidirectional switch group, so that the matrix motor system can be continuously operated in a fault-tolerant mode through the form of bridge arm reuse.

[0019] Further, the method comprises the following steps:

[0020] Step 1, determining the position of the power device fault;

[0021] Step 2, if the power device fault occurs in the first bridge arm S m , m = 1, 2…j, executing Step 3- Step 5; if the power device fault occurs in the second bridge arm R n , n = 1, 2…k, executing Step 6- Step 8;

[0022] Step 3, blocking the first bridge arm S m ;

[0023] Step 4, closing the stator bidirectional switch connected with the first bridge arm S m in the stator bidirectional switch group;

[0024] Step 5, closing any one of the rotor bidirectional switches in the rotor bidirectional switch group, the second bridge arm corresponding to the closed rotor bidirectional switch simultaneously feeds the rotor corresponding phase winding and the mth phase stator winding, the power supply loop of the mth phase winding corresponding to the fault bridge arm is reconstructed, and a healthy second bridge arm in the rotor k-phase inverter bears the power supply of the mth phase stator winding, at this time, the second bridge arm corresponding to the closed rotor bidirectional switch is in a reuse state;

[0025] Step 6, blocking the second bridge arm R n , n = 1, 2…k;

[0026] Step 7, closing the rotor bidirectional switch connected with the second bridge arm Rn in the rotor bidirectional switch group;

[0027] Step 8, any one of the stator bidirectional switch groups is closed, the first bridge arm corresponding to the closed stator bidirectional switch simultaneously feeds the stator corresponding phase winding and the nth phase rotor winding, the power supply loop of the nth phase rotor winding corresponding to the fault bridge arm is reconstructed, and the rotor n phase winding is borne by a healthy first bridge arm in the stator j phase inverter, at this time, the first bridge arm corresponding to the closed stator bidirectional switch is in a multiplexing state.

[0028] Further, in the Step 3, the first bridge arm S m is blocked in the following manner: the gate signals corresponding to the two power devices of the first bridge arm S m are turned off.

[0029] Further, in the Step 6, the second bridge arm R n is blocked in the following manner: the gate signals corresponding to the two power devices of the second bridge arm R n are turned off.

[0030] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0031] (1) When facing the open-circuit fault of the matrix motor power device, the present application does not need to abandon the healthy phase winding corresponding to the fault bridge arm, but reconstructs the power supply loop of the healthy phase winding through the two groups of bidirectional switches, so that the phase winding corresponding to the fault bridge arm can still normally generate magnetic motive force, and the torque ripple after the fault is reduced.

[0032] (2) The present application can cope with extreme fault conditions that the existing matrix motor fault-tolerant control method cannot cope with, for example, the stator j phase inverter has a more serious power device open-circuit fault, only two bridge arms are fault-free, and at least three phase windings including the two phase windings connected by the two bridge arms are not phase-out fault. Under this extreme fault condition, the existing fault-tolerant control method cannot continue to maintain the operation of the stator, and can only abandon all the windings of the stator, because in the case where the neutral point is not introduced, the two phase windings supplied by the two phase bridge arms of the stator cannot normally generate rotating magnetic motive force. Through the phase-out reconstruction driving circuit topology and reconstruction method of the present application, a certain phase bridge arm on the rotor side can be multiplexed, and the healthy phase winding corresponding to a certain fault bridge arm on the stator side is supplied by the bridge arm, so that the stator side can be regarded as a set of three-phase bridge arm supplied three-phase winding, and then the magnetic motive force can be normally generated, avoiding the abandonment of the whole stator, and avoiding the overload operation of the rotor side inverter, reducing the thermal load of the whole system on the rotor side after the fault.

[0033] (3) Some existing fault-tolerant circuit topologies tolerate faults by increasing the number of bridge arms and power devices, for example, the open-winding motor drive topology, which increases the number of bridge arms to the number of winding phases. Since the power devices such as IGBT used in the bridge arm are relatively expensive, the increased number of bridge arms greatly increases the system cost. The bidirectional switching device used in the present application includes a bidirectional thyristor or a bidirectional solid-state relay, etc., which is lower in price than the power device, so the circuit topology proposed in the present application can effectively save cost. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a matrix motor open-phase reconstruction drive system circuit topology of an embodiment of the present patent;

[0035] Figure 2 is a matrix motor open-phase reconstruction method flow chart of an embodiment of the present patent;

[0036] Figure 3 is an example diagram of a matrix motor stator-side open-phase reconstruction circuit after reconstruction of an embodiment of the present patent;

[0037] Figure 4 is an example diagram of a matrix motor rotor-side open-phase reconstruction circuit after reconstruction of an embodiment of the present patent. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the drawings and specific embodiments.

[0039] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0040] It should be noted that when an element is referred to as being "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", etc. used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "and / or" includes a set of one or more associated listed items.

[0042] Referring to Figure 1 , the application provides a matrix motor open-phase reconstruction system, comprising a DC bus power supply, a stator j-phase inverter, a stator bidirectional switch group, a rotor k-phase inverter, a rotor bidirectional switch group and a matrix motor stator-rotor armature winding; wherein the matrix motor stator-rotor armature winding comprises a j-phase stator winding and a k-phase rotor winding, j≥3 and k≥3.

[0043] The DC bus power supply can supply power to the stator j-phase inverter and the rotor k-phase inverter at the same time.

[0044] The stator j-phase inverter is composed of j first bridge arms, i.e. a bridge arm S1, a bridge arm S2, a bridge arm S3, … a bridge arm Sj. j Each bridge arm is composed of an upper power device and a lower power device. Preferably, the power devices can be insulated gate bipolar transistors (IGBT). In each first bridge arm, the collector of the upper power device is connected to the positive pole of the DC bus power supply, the emitter of the upper power device is connected to the collector of the lower power device, and the emitter of the lower power device is connected to the negative pole of the DC bus power supply. The midpoint of the first bridge arm, i.e. the connection point of the emitter of the upper power device and the collector of the lower power device, is connected to the first end of a phase winding of the stator. Preferably, the connection mode can be selected from a cable, a soft copper wire, a copper busbar or other conductors.

[0045] The j-phase stator winding is a star-connected matrix motor stator armature winding, and the second ends of all phase stator windings are connected together. The first ends of each phase stator winding are connected to the midpoints of the j first bridge arms in the stator j-phase inverter, respectively.

[0046] The stator bidirectional switch group is composed of j stator bidirectional switches, i.e. a stator bidirectional switch SSR s1 , a stator bidirectional switch SSR s2 , a stator bidirectional switch SSR s3 , …, a stator bidirectional switch SSR sj . Preferably, the stator bidirectional switch can be a bidirectional thyristor (TRIAC) or a solid-state relay (SSR) or the like. One end of the j stator bidirectional switches is connected together to form a common neutral connection point of the stator side bidirectional switch group. The other end of the j stator bidirectional switches is connected to the midpoints of the j first bridge arms in the stator j-phase inverter, respectively.

[0047] The rotor k-phase inverter is composed of bridge arm R1, bridge arm R2, ... bridge arm R k The second bridge arm is composed of k second bridge arms. The second bridge arm is composed of two upper and lower power devices. Preferably, the power devices can be insulated gate bipolar transistors (IGBTs). In each second bridge arm, the collector of the upper tube is connected to the positive electrode of the DC bus power supply, the emitter of the upper tube is connected to the collector of the lower tube, and the emitter of the lower tube is connected to the negative electrode of the DC bus power supply. The midpoint of the second bridge arm, that is, the connection point between the emitter of the upper tube and the collector of the lower tube, is further connected to the first end of a phase winding of the rotor. Preferably, the connection method can be selected to be connected using a cable, soft copper wire, copper busbar or other conductor.

[0048] The k-phase rotor winding is a star-connected matrix motor rotor armature winding, the second ends of all phase rotor windings are connected together, and the first end of each phase winding is respectively connected to the midpoints of k second bridge arms in the rotor k-phase inverter.

[0049] The rotor bidirectional switch group is composed of a rotor bidirectional switch SSR r1 , rotor bidirectional switch SSR r2 、……、Rotor bidirectional switch SSR rk The rotor bidirectional switches are composed of k rotor bidirectional switches. Preferably, the rotor bidirectional switches can be bidirectional thyristors or solid-state relays. One end of the k rotor bidirectional switches is connected together to form a common neutral connection point of the rotor-side bidirectional switch group, and the other ends of the k rotor bidirectional switches are respectively connected to the midpoints of the k second bridge arms of the rotor k-phase inverter.

[0050] The common neutral connection point of the stator bidirectional switch group is connected to the common neutral connection point of the rotor bidirectional switch group.

[0051] Reference Figure 2 The present invention also provides a method for phase loss reconstruction of a matrix motor, comprising the following steps:

[0052] Step 1: Determine the location where the power device fault occurs;

[0053] Step 2: If the power device fault occurs in the bridge arm S of the stator j-phase inverter m On the other hand, m=1,2…j, execute Step3-Step6;

[0054] Step 3: Block bridge arm S m The blocking method is to block the bridge arm S m The gate signals corresponding to the upper and lower tubes are turned off;

[0055] Step 4: Close the stator bidirectional switch SSR in the stator bidirectional switch group sm ;

[0056] Step5, close any one of the rotor bidirectional switch group; for example, preferably, the rotor bidirectional switch SSR r1 ;

[0057] Step6, the closed rotor bidirectional switch corresponding to the rotor k-phase inverter bridge arm simultaneously feeds the rotor corresponding phase winding and the mth phase stator winding; the purpose of steps Step4, Step5 and Step6 is to reconstruct the power supply circuit of the mth phase winding corresponding to the stator fault bridge arm, and the second healthy bridge arm R1 in the rotor k-phase inverter is used to undertake the power supply of the mth phase winding of the stator, at this time the second bridge arm R1 is in the multiplexing state, and the open-phase reconstruction is completed;

[0058] Step7, if the power device fault occurs in the bridge arm R n , execute Step8- Step11;

[0059] Step8, lock the bridge arm R n , n=1, 2…k. The locking mode is to turn off the gate signals corresponding to the upper and lower tubes of the bridge arm R n ;

[0060] Step9, close the rotor bidirectional switch SSR rn ;

[0061] Step10, close any one of the stator bidirectional switch group; for example, preferably, the stator bidirectional switch SSR s1 ;

[0062] Step11, the closed stator bidirectional switch SSR s1 corresponding to the first bridge arm simultaneously feeds the stator corresponding phase winding and the nth phase rotor winding; the purpose of steps Step9, Step10 and Step11 is to reconstruct the power supply circuit of the nth phase winding corresponding to the rotor fault bridge arm, and the first healthy bridge arm S1 in the j-phase stator inverter is used to undertake the power supply of the nth phase rotor winding, at this time the first bridge arm S1 is in the multiplexing state, and the open-phase reconstruction is completed.

[0063] Figure 3An example diagram of a circuit after phase reconstruction on the stator side of a matrix motor according to an embodiment of the application is shown. Note that only the closed bidirectional switches are drawn in the stator bidirectional switch group and the rotor bidirectional switch group, and the non-closed bidirectional switches are omitted. The remaining bidirectional switches still exist in the circuit and the connection mode has not changed, except that they are not closed. At this time, the S3 bridge arm upper tube of the stator j-phase inverter has an open circuit fault, and the gate signals of the upper and lower tubes of the S3 bridge arm are both turned off to lock the S3 bridge arm. The bidirectional switches SSR s3 and the bidirectional switches SSR r1 (in the stator bidirectional switch group, the closed switch can be any one, here is only an example), the power supply circuit of the stator S3-phase winding is reconstructed, and at this time the R1 bridge arm in the rotor k-phase inverter supplies power to the stator S3-phase winding and the rotor R1-phase winding.

[0064] Figure 4 An example diagram of a circuit after phase reconstruction on the rotor side of a matrix motor according to an embodiment of the application is shown. Note that only the closed bidirectional switches are drawn in the stator bidirectional switch group and the rotor bidirectional switch group, and the non-closed bidirectional switches are omitted. The remaining bidirectional switches still exist in the circuit and the connection mode has not changed, except that they are not closed. At this time, the R2 bridge arm lower tube of the rotor k-phase inverter has an open circuit fault, and the gate signals of the upper and lower tubes of the R2 bridge arm are both turned off to lock the R2 bridge arm. The bidirectional switches SSR r2 and the bidirectional switches SSR s4 (in the stator bidirectional switch group, the closed switch can be any one, here is only an example), the power supply circuit of the rotor R2-phase winding is reconstructed, and at this time the S4 bridge arm in the stator j-phase inverter supplies power to the stator S4-phase winding and the rotor R2-phase winding.

[0065] In summary, the application connects the midpoints of each phase bridge arm of the stator and rotor power inverters of a matrix motor through bidirectional switches. When an open circuit fault occurs in a power device of a bridge arm, the fault phase bridge arm is locked, and the still healthy winding corresponding to the fault phase bridge arm is switched to the midpoint of another normal bridge arm through the action of the bidirectional switch. Through bridge arm reuse, uninterrupted fault-tolerant operation of the matrix motor system under power device failure is achieved. The proposed drive circuit topology and reconstruction method with phase reconstruction capability can maximize the use of healthy phase windings of the matrix motor under power device failure conditions, achieve uninterrupted fault-tolerant operation, and improve the output performance of the electromagnetic torque of the motor after failure.

[0066] The term "consisting of" is intended to mean a combination of the specified elements, ingredients, components, or steps, and no other element, ingredient, component, or step. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components, or steps herein is not meant to be construed as a statistical requirement that all of the elements, ingredients, components, or steps be present. Rather, the term "comprising" or "including" is intended to mean that the described elements, ingredients, components, or steps are optional and not exhaustive, and that other elements, ingredients, components, or steps can be present in addition to or instead of those listed.

[0067] Plural elements, ingredients, components, or steps can be provided by a single integrated element, ingredient, component, or step. Alternatively, a single integrated element, ingredient, component, or step might be divided into separate plural elements, ingredients, components, or steps. The disclosure of "a" or "one" to describe an element, ingredient, component, or step is not meant to foreclose the existence of

[0068] It is understood that the above description is intended to be illustrative and not restrictive. Many embodiments and applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the technology should be determined, not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for the purpose of the present disclosure. The omission of any aspect of the subject matter disclosed herein does not preclude coverage of such aspect, nor does it surrender the inventor's rights in such aspect of the disclosure, all of which are hereby incorporated by reference.

Claims

1. A matrix motor phase loss reconstruction system, characterized in that: It includes a stator j-phase inverter, a rotor k-phase inverter, a j-phase stator winding, a k-phase rotor winding, a stator bidirectional switch group, and a rotor bidirectional switch group; j≥3, k≥3; The stator j-phase inverter includes j first bridge arms; the first bridge arm includes an upper power device and a lower power device, the collector of the upper power device is connected to the positive electrode of the DC power supply, the emitter of the upper power device is connected to the collector of the lower power device, forming a first bridge arm midpoint, and the j first bridge arm midpoints are respectively connected to the first end of the j-phase stator winding; the emitter of the lower power device is connected to the negative electrode of the DC power supply; The rotor k-phase inverter comprises k second bridge arms having the same structure as the first bridge arm; the midpoints of the k second bridge arms are respectively connected to the first ends of the k-phase rotor windings; Each first bridge arm midpoint is connected to all second bridge arm midpoints via a stator bidirectional switch group and a rotor bidirectional switch group; The j-phase stator winding is a star-connected matrix motor stator armature winding, and the second ends of all phase stator windings are connected together; the k-phase rotor winding is a star-connected matrix motor rotor armature winding, and the second ends of all phase rotor windings are connected together; The stator bidirectional switch group includes j stator bidirectional switches, and the rotor bidirectional switch group includes k rotor bidirectional switches; one end of the j stator bidirectional switches and one end of the k rotor bidirectional switches are connected together, and the other ends of the j stator bidirectional switches are respectively connected to the midpoints of the j first bridge arms; the other ends of the k rotor bidirectional switches are respectively connected to the midpoints of the k second bridge arms.

2. The matrix motor phase loss reconstruction system according to claim 1, characterized in that: The stator bidirectional switch and the rotor bidirectional switch are bidirectional thyristors or solid-state relays.

3. The matrix motor phase loss reconstruction system according to claim 1, characterized in that: The power device is an insulated gate bipolar transistor.

4. The matrix motor phase loss reconstruction system according to claim 1, characterized in that: The connection is made by cables, soft copper wires, copper busbars or other conductors.

5. The matrix motor phase loss reconstruction system according to claim 1, characterized in that: The DC power supply is a DC bus power supply.

6. A method for phase loss reconstruction of a matrix motor based on the phase loss reconstruction system according to claim 1, characterized in that: include: When an open-circuit fault occurs in the power device of a bridge arm in the stator j-phase inverter or the rotor k-phase inverter, the faulty bridge arm is blocked. At the same time, through the action of the stator bidirectional switch group and the rotor bidirectional switch group, the healthy winding corresponding to the faulty bridge arm is switched to the midpoint of other normal bridge arms. By multiplexing the bridge arms, the matrix motor system can operate uninterruptedly and fault-tolerantly under power device failure.

7. The method for phase loss reconstruction of a matrix motor according to claim 6, characterized in that: The following steps are involved: Step 1: Determine the location where the power device fault occurs; Step 2: If the power device failure occurs in the first bridge arm S of the stator j-phase inverter m On the top, m=1,2…j, execute Step3-Step5; if the power device fault occurs in the second bridge arm R of the rotor k-phase inverter n For n=1,2…k, execute Step 6-Step 8. Step 3: Block the first bridge arm S m ; Step 4: Close the stator bidirectional switch group connected to the first bridge arm S m Connected stator bidirectional switch; Step 5: Close any rotor bidirectional switch in the rotor bidirectional switch group. The second bridge arm corresponding to the closed rotor bidirectional switch simultaneously feeds power to the corresponding rotor phase winding and the m-th phase stator winding. The power supply circuit of the m-th phase winding corresponding to the faulty bridge arm is reconstructed, and the power supply of the m-th phase stator winding is taken over by a healthy second bridge arm in the rotor k-phase inverter. At this time, the second bridge arm corresponding to the closed rotor bidirectional switch is in a reused state. Step 6: Block the second bridge arm R n , n=1,2…k; Step 7, close the rotor bidirectional switch group and the second bridge arm R n Connected rotor two-way switch; Step 8: Close any stator bidirectional switch in the stator bidirectional switch group. The first bridge arm corresponding to the closed stator bidirectional switch feeds power to the corresponding stator phase winding and the n-phase rotor winding at the same time. The power supply circuit of the n-phase rotor winding corresponding to the faulty bridge arm is reconstructed, and the power supply of the rotor n-phase winding is taken over by a healthy first bridge arm in the stator j-phase inverter. At this time, the first bridge arm corresponding to the closed stator bidirectional switch is in a reused state.

8. The method for phase loss reconstruction of a matrix motor according to claim 7, characterized in that: In Step 3, the first arm S of the bridge is blocked. m The method is to connect the first bridge arm S m The gate signals corresponding to the two power devices are turned off.

9. The method for phase loss reconstruction of a matrix motor according to claim 7, characterized in that: In Step 6, the second bridge arm R is blocked. n The method is: the second bridge arm R n The gate signals corresponding to the two power devices are turned off.

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