Matrix motor open-phase reconstruction system and reconstruction method

Abstract

The invention discloses an open-phase reconstruction system and reconstruction method for a matrix motor, and belongs to the technical field of motor driving systems, midpoints of bridge arms of phases of a stator and rotor power inverter of the matrix motor are connected through a bidirectional switch, when a power device of a certain bridge arm in the inverter has an open-circuit fault, the bridge arm of the fault phase is blocked, and the open-phase reconstruction of the matrix motor is realized. And meanwhile, the winding which is still healthy and corresponds to the fault phase bridge arm is switched to the midpoint of other normal bridge arms through the action of the two-way switch, and uninterrupted fault-tolerant operation of the matrix motor system under the power device fault is realized through a bridge arm multiplexing form. According to the drive circuit topology with the open-phase reconstruction capability and the reconstruction method provided by the invention, the healthy phase winding of the matrix motor can be utilized to the greatest extent under the power device fault working condition, the uninterrupted fault-tolerant operation is realized, and the output performance of the electromagnetic torque of the motor after the fault is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor drive systems, and in particular relates to a phase loss reconstruction system and a reconstruction method for a matrix motor. Background Art

[0002] The matrix motor is a magnetic field modulation motor. The difference between it and the conventional magnetic field modulation motor is that the matrix motor has multiple redundant magnetic sources inside, that is, the stator and rotor are simultaneously distributed with magnetic steel and multi-phase armature windings. The armature windings on the stator and rotor of the matrix motor can interact with the magnetic steel on the stator and rotor respectively, resulting in multiple magnetic field modulation effects, and then output multiple torque components distributed in a matrix. Due to the characteristics of multiple magnetic sources, the matrix motor has a strong fault tolerance capability. At the same time, the multiple torque components distributed in a matrix significantly improve the torque density of the motor. Therefore, the matrix motor has great application potential in electric vehicles, multi-electric / all-electric aircraft, and other occasions that have high requirements for the power density, reliability and safety of the motor system.

[0003] At present, the main causes of open-circuit failures in motor systems include open circuits of power devices, bridge arm fuses caused by short circuits of power devices, and phase failures of motor armature windings. The idea of ​​the existing open-circuit fault-tolerant control strategy of matrix motors can be summarized as the reconstruction of torque components, that is, when a phase failure occurs in the stator or rotor winding or a power device failure occurs in its corresponding bridge arm, the matrix motor can cut off the faulty unit and continue to generate healthy torque components through the remaining healthy components or the remaining healthy phases, thereby continuously outputting torque. This fault-tolerant control strategy is similar to the idea of ​​multi-phase motors that reconstruct the remaining healthy phase currents to maintain the magnetomotive force unchanged.

[0004] The limitations of the existing matrix motor open circuit fault-tolerant control strategy are mainly manifested in the incomplete and insufficient utilization of the remaining healthy parts of the motor, which leads to the degradation of the control performance of the system. Among the causes of open circuit faults, the probability of power device failure is high, while the probability of phase failure of the motor armature winding is low. For the existing matrix motor fault-tolerant control method, when a few phase bridge arm power device open circuit fault occurs (for a few phase bridge arm open circuit faults, after blocking these bridge arms, the remaining windings can still generate rotating magnetic potential), the bridge arm where the power device is located is directly blocked, so that the still normal phase winding connected to the faulty bridge arm is also blocked, and the current of the phase winding corresponding to the remaining healthy bridge arm is reconstructed to ensure the continuous output of torque; however, the normal phase winding connected to the faulty bridge arm is actually healthy, but it is directly abandoned, resulting in the actual waste of magnetic source. Since the remaining windings are asymmetric in space, the reconstructed electromagnetic torque will also have a certain degree of pulsation, which reduces the control performance of the system. Summary of the invention

[0005] Taking into account the limitations of the above-mentioned existing methods, this patent targets open-circuit faults of power devices, which account for the largest proportion of fault conditions. The present invention provides a phase-loss reconstruction system and reconstruction method for a matrix motor, thereby achieving uninterrupted fault-tolerant operation of the matrix motor system under power device failures, maximizing the use of healthy phase windings of the matrix motor under power device failure conditions, and improving the output performance of the motor's electromagnetic torque after a failure.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a phase loss reconstruction system for a matrix motor, comprising 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; The stator j-phase inverter comprises j first bridge arms; the first bridge arm comprises 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, 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 end of the k-phase rotor winding; 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.

[0007] Furthermore, 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.

[0008] Furthermore, the power device is an insulated gate bipolar transistor.

[0009] Furthermore, the connection is made by cables, soft copper wires, copper busbars or other conductors.

[0010] Furthermore, the stator bidirectional switch and the rotor bidirectional switch are bidirectional thyristors or solid-state relays.

[0011] Furthermore, the DC power supply is a DC bus power supply.

[0012] In a second aspect, the present invention provides a method for phase loss reconstruction of a matrix motor based on the above-mentioned phase loss reconstruction system, comprising: When an open-circuit fault occurs in a power device of a bridge arm in the stator j-phase inverter or the rotor k-phase inverter, the bridge arm of the faulty phase is blocked. At the same time, through the action of the stator bidirectional switch group and the rotor bidirectional switch group, the still healthy winding corresponding to the bridge arm of the faulty phase is switched to the midpoint of other normal bridge arms. Through the form of bridge arm multiplexing, the matrix motor system can operate uninterruptedly and fault-tolerantly under power device failure.

[0013] Further, the following steps are included: Step 1, determine the location where the power device failure occurs; Step 2: If the power device failure occurs in the first bridge arm S of the stator j-phase inverter m On, m=1,2…j, execute Step3-Step5; if the power device failure occurs in the second bridge arm R of the rotor k-phase inverter n On, n=1,2…k, execute Step6-Step8; 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 feeds power to the corresponding rotor phase winding and the m-th phase stator winding at the same time, reconstructs the power supply circuit of the m-th phase winding corresponding to the faulty bridge arm, and uses a healthy second bridge arm in the rotor k-phase inverter to supply power to the m-th phase stator winding. 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 connected to the second bridge arm Rn in the rotor bidirectional switch group; 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, reconstructs the power supply circuit of the n-phase rotor winding corresponding to the faulty bridge arm, and uses a healthy first bridge arm in the stator j-phase inverter to supply power to the rotor n-phase winding. At this time, the first bridge arm corresponding to the closed stator bidirectional switch is in a reused state.

[0014] Furthermore, in Step 3, the first bridge arm S of the bridge is blocked. mThe method is to connect the first bridge arm S m The gate signals corresponding to the two power devices are turned off.

[0015] Furthermore, 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.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: (1) When facing an open-circuit fault in the matrix motor power device, the invention does not need to abandon the healthy phase winding corresponding to the faulty bridge arm. Instead, the power supply circuit of the healthy phase winding is reconstructed through two sets of bidirectional switches. This allows the phase winding corresponding to the faulty bridge arm to still generate magnetic motive force normally, thereby reducing the torque pulsation after the fault.

[0017] (2) The present invention can cope with extreme fault conditions that the existing matrix motor fault-tolerant control method cannot cope with. For example, when a relatively serious open-circuit fault of the power device occurs in the stator j-phase inverter, only two bridge arms do not have any faults, and at least three-phase windings including the two-phase windings connected to the two bridge arms do not have a phase failure. Under such extreme fault conditions, the existing fault-tolerant control method cannot continue to maintain the operation of the stator and can only abandon all the stator windings, because when the neutral point is not drawn out, the two-phase winding powered by the two-phase bridge arms of the stator cannot normally generate a rotating magnetic motive force. However, through the phase-loss reconstruction drive circuit topology and reconstruction method of the present invention, a certain phase bridge arm on the rotor side can be reused, and the healthy phase winding corresponding to a certain faulty bridge arm on the stator side can be powered by the bridge arm. Then, the stator side can be regarded as a three-phase winding with a complete set of three-phase bridge arm power supply, and can then generate magnetic motive force normally, avoiding the abandonment of the entire stator, and avoiding the overload operation of the rotor-side inverter, and reducing the thermal load of the overall system on the rotor side after the fault.

[0018] (3) Some existing fault-tolerant circuit topologies achieve fault tolerance by increasing the number of bridge arms and power devices. For example, in an open-winding motor drive topology, the number of bridge arms increased is the number of winding phases. Since the power devices such as IGBTs used in the bridge arms are relatively expensive, the system cost is greatly increased. The bidirectional switch devices used in the present invention include bidirectional thyristors or bidirectional solid-state relays, etc., which are cheaper than power devices. Therefore, the circuit topology proposed in the present invention can effectively save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a circuit topology diagram of a matrix motor phase loss reconstruction drive system according to an embodiment of the present patent; Figure 2 This is a flow chart of a matrix motor phase loss reconstruction method according to an embodiment of the present patent; Figure 3 This is an example diagram of a circuit after reconstruction of a matrix motor stator side missing phase according to an embodiment of the present patent; Figure 4 This is an example diagram of a circuit after reconstruction of a matrix motor rotor side phase loss in an embodiment of this patent. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. used herein indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] Reference Figure 1 The present invention proposes a matrix motor phase loss 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 and rotor armature winding; wherein the matrix motor stator and rotor armature winding comprises a j-phase stator winding and a k-phase rotor winding, j≥3, k≥3.

[0025] The DC bus power supply can simultaneously supply power to the stator j-phase inverter and the rotor k-phase inverter; The stator j-phase inverter is composed of bridge arm S1, bridge arm S2, bridge arm S3, ... bridge arm S j The bridge arm is composed of two upper and lower power devices (referred to as upper tube and lower tube), preferably, the power device can be an insulated gate bipolar transistor (IGBT). In each first 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 first bridge arm, that is, the connection point between the emitter of the upper tube and the collector of the lower tube is connected to the first end of a phase winding of the stator. Preferably, the connection method can be selected to be connected by cable, soft copper wire, copper busbar or other conductors.

[0026] The j-phase stator winding is a star-connected matrix motor stator armature winding, the second ends of all phase stator windings are connected together, and the first end of each phase stator winding is respectively connected to the midpoints of j first bridge arms in the stator j-phase inverter.

[0027] The stator bidirectional switch group is composed of a stator bidirectional switch SSR s1 , Stator bidirectional switch SSR s2 , Stator bidirectional switch SSR s3 ,……, Stator bidirectional switch SSR sj A total of j stator bidirectional switches are formed. Preferably, the stator bidirectional switch can be a device such as a bidirectional thyristor (TRIAC) or a solid-state relay (SSR). 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 ends of the j stator bidirectional switches are respectively connected to the midpoints of the j first bridge arms in the stator j-phase inverter.

[0028] 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 device can be an insulated gate bipolar transistor (IGBT). 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 connected to the first end of a phase winding of the rotor. Preferably, the connection method can be selected to be connected by cable, soft copper wire, copper busbar or other conductors.

[0029] 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.

[0030] 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 switch is composed of k rotor bidirectional switches. Preferably, the rotor bidirectional switch can be a device such as a bidirectional thyristor or a solid-state relay. 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 end of the k rotor bidirectional switches is respectively connected to the midpoints of the k second bridge arms in the rotor k-phase inverter.

[0031] 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.

[0032] Reference Figure 2 The present invention also provides a method for phase loss reconstruction of a matrix motor, comprising the following steps: Step 1, determine the location where the power device failure occurs; Step 2: If the power device failure occurs in the bridge arm S of the stator j-phase inverter m On, m=1,2…j, execute Step3-Step6; 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; Step 4: Close the stator bidirectional switch SSR in the stator bidirectional switch group. sm ; Step 5, close any one of the bidirectional switches in the rotor bidirectional switch group; for example, preferably, the rotor bidirectional switch SSR in the rotor bidirectional switch group can be closed at this time. r1 ; Step 6, the rotor k-phase inverter bridge arm corresponding to the closed rotor bidirectional switch feeds power to the corresponding rotor phase winding and the m-phase stator winding at the same time; the purpose of Step 4, Step 5 and Step 6 is to reconstruct the power supply circuit of the m-phase winding corresponding to the stator fault bridge arm, and the power supply of the m-phase winding of the stator is assumed by the healthy second bridge arm R1 in the rotor k-phase inverter. At this time, the second bridge arm R1 is in a reused state, and the phase-missing reconstruction is completed; Step 7: If the power device failure occurs in the bridge arm R of the rotor k-phase inverter n , execute Step8-Step11; Step 8, block bridge arm R n , n=1,2…k. The blocking method is to connect the bridge arm R n The gate signals corresponding to the upper and lower tubes are turned off; Step 9: Close the rotor bidirectional switch SSR in the rotor bidirectional switch group. rn ; Step 10, close any stator bidirectional switch in the stator bidirectional switch group; for example, preferably, at this time, the stator bidirectional switch SSR in the stator bidirectional switch group can be closed. s1 ; Step 11, the stator bidirectional switch SSR is closed s1 The corresponding first bridge arm feeds power to the corresponding phase winding of the stator and the n-phase rotor winding at the same time; the purpose of steps Step9, Step10 and Step11 is to reconstruct the power supply circuit of the n-phase winding corresponding to the rotor fault bridge arm, and the healthy first bridge arm S1 in the j-phase stator inverter is used to supply power to the n-phase rotor winding. At this time, the first bridge arm S1 is in a reused state, and the phase-missing reconstruction is completed.

[0033] Figure 3 The figure shows an example diagram of a circuit after reconstruction of a matrix motor stator side phase loss provided by an embodiment of the present invention. Note that in the figure, only the closed bidirectional switches are drawn in the stator bidirectional switch group and the rotor bidirectional switch group, and the unclosed bidirectional switches are omitted. The remaining bidirectional switches still exist in the circuit, and the connection method has not changed, but they are not closed. At this time, an open circuit fault occurs on the upper tube of the S3 bridge arm of the stator j-phase inverter, and the gate signals of the upper and lower tubes of the S3 bridge arm are turned off, blocking the S3 bridge arm. Close the bidirectional switch SSR in the stator bidirectional switch group. s3 And the bidirectional switch SSR in the rotor bidirectional switch group r1 (The closed switch in the rotor bidirectional switch group can be any one, this is just an example), the power supply circuit of the stator S3 phase winding is reconstructed, and now the R1 bridge arm in the rotor k-phase inverter simultaneously supplies power to the stator S3 phase winding and the rotor R1 phase winding.

[0034] Figure 4 The figure shows an example diagram of a circuit after reconstruction of the rotor side missing phase of a matrix motor provided by an embodiment of the present invention. Note that in the figure, only the closed bidirectional switches of the stator bidirectional switch group and the rotor bidirectional switch group are drawn, and the unclosed bidirectional switches are omitted. The remaining bidirectional switches still exist in the circuit, and the connection method has not changed, but they are not closed. At this time, an open circuit fault occurs in the lower tube of the R2 bridge arm of the rotor k-phase inverter, and the gate signals of the upper and lower tubes of the R2 bridge arm are turned off, blocking the R2 bridge arm. Close the bidirectional switch SSR in the rotor bidirectional switch group r2 And the bidirectional switch SSR in the stator bidirectional switch group s4 (The closed switch in the stator bidirectional switch group can be any one, this is just an example), the power supply circuit of the rotor R2 phase winding is reconstructed, and now the S4 bridge arm in the stator j phase inverter simultaneously supplies power to the stator S4 phase winding and the rotor R2 phase winding.

[0035] In summary, the present invention connects the midpoints of the bridge arms of each phase of the matrix motor stator and rotor power inverter through a bidirectional switch. When an open circuit fault occurs in a power device of a bridge arm in the inverter, the bridge arm of the faulty phase is blocked, and at the same time, the still healthy winding corresponding to the bridge arm of the faulty phase is switched to the midpoint of other normal bridge arms through the action of the bidirectional switch. Through the form of bridge arm multiplexing, the matrix motor system is realized to operate uninterruptedly and fault-tolerantly under power device failure. The proposed drive circuit topology and reconstruction method with phase loss reconstruction capability can maximize the use of the healthy phase windings of the matrix motor under power device failure conditions, realize uninterrupted fault-tolerant operation, and improve the output performance of the motor electromagnetic torque after the failure.

[0036] The term "consisting of" describing a combination shall include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any of the attributes described that "may" be included are optional.

[0037] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0038] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

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 comprises j first bridge arms; the first bridge arm comprises 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, 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 end of the k-phase rotor winding; 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.

2. A matrix motor phase loss reconstruction system according to claim 1, characterized in that: 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.

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

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

5. 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.

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

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

8. A method for phase loss reconstruction of a matrix motor according to claim 7, characterized in that: The following steps are involved: Step 1, determine the location where the power device failure occurs; Step 2: If the power device failure occurs in the first bridge arm S of the stator j-phase inverter m On, m=1,2…j, execute Step3-Step5; if the power device failure occurs in the second bridge arm R of the rotor k-phase inverter n On, n=1,2…k, execute Step6-Step8; 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 feeds power to the corresponding rotor phase winding and the m-th phase stator winding at the same time, reconstructs the power supply circuit of the m-th phase winding corresponding to the faulty bridge arm, and uses a healthy second bridge arm in the rotor k-phase inverter to supply power to the m-th phase stator winding. 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, reconstructs the power supply circuit of the n-phase rotor winding corresponding to the faulty bridge arm, and uses a healthy first bridge arm in the stator j-phase inverter to supply power to the rotor n-phase winding. At this time, the first bridge arm corresponding to the closed stator bidirectional switch is in a reused state.

9. A 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.

10. 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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