CN206542351U - Motorized motions fault tolerance facility, polyphase machine, power inverter and electrical equipment - Google Patents

Abstract

The utility model provides an electric drive fault-tolerant device with a fault-tolerant function, a multi-phase motor, a power converter and electric equipment. The electric drive fault-tolerant device provided by the utility model is used to drive electric equipment, including: a multi-phase motor; a DC power supply; a command sending part; a current sensor; an output sensor; a battery management unit; a controller; a driver; In that, the multi-phase motor winding has j+i multi-phase winding units, the DC power supply has j+i battery units, and the power converter has j+i multi-phase winding units and j+i battery units correspondingly connected Each power conversion unit has k power conversion circuits to provide k line currents to the corresponding multi-phase winding unit, and the driver has j+i driving units, which are respectively connected to j+i power conversion units, k is a positive integer greater than 2, j is a positive integer greater than 1, and i is a redundant number and a natural number.

Description

Electric drive fault-tolerant devices, multi-phase motors, power converters and electric equipment

technical field

The utility model belongs to the field of motors, in particular to an electric drive fault-tolerant device with a fault-tolerant function, a multi-phase motor, a power converter and electric equipment.

Background technique

In today's society, the requirements for environmental protection are getting higher and higher, and the environmental protection standards of various equipment are also increasing. In order to better protect the environment, the state has issued various policies and vigorously promoted new energy and renewable energy.

At present, using electric energy as the driving force of various equipment has become the mainstream of equipment development. Electric equipment such as electric vehicles and electric forklifts that use electricity as energy are increasingly favored by manufacturers and consumers. Electric equipment not only has less pollution and can provide electric energy through renewable energy, but also has the advantages of high energy utilization rate, simple structure, low noise, good dynamic performance and high portability compared with fuel equipment. Under the situation of increasingly tight oil resources, vigorously developing electric drive devices, especially high-power electric drive devices such as electric chariots, electric warships, electric aircraft and electric drive aircraft carriers, etc., has far-reaching significance for national defense and security.

Batteries are the core components of electric equipment. Due to the limitation of the current battery manufacturing technology level, battery cells are generally used in groups in a series-parallel combination to meet the power requirements of large loads. When individual battery cells fail, the performance of the entire battery pack will deteriorate, and in severe cases, it may cause safety accidents such as explosion or combustion of the battery.

Large-capacity battery packs, especially in low-voltage systems, will cause severe heating of the output wires and connectors due to the large current. This puts higher requirements on the resistance and insulation protection of the output lines and connectors, increases the production cost, and reduces the reliability and safety of the system.

In addition, the overall performance of large-capacity series-parallel battery packs is not enhanced by the linear superposition of the capacity and number of battery cells. Therefore, the larger the capacity of the battery pack, the greater the number of battery cells required, which increases the weight, volume and cost of the electric drive device and electric equipment, and reduces the reliability and safety of the system.

In the current electric drive device, the requirements for the power conversion tube are extremely strict. During normal operation, the power conversion tube must work below the maximum operating temperature, maximum operating current and maximum operating voltage. Once any condition is exceeded, the power conversion tube It is very easy to damage; in addition, when the parameters of the components in the electronic circuit change beyond the normal operating range, overvoltage or overcurrent may be generated in the power conversion tube, resulting in damage to the power conversion tube and causing electrical equipment failure; in addition, with the work With the increase of time, the power conversion tube will age, and the maximum working temperature, maximum working current and maximum working voltage will all decrease, which will easily lead to damage and failure of the power conversion tube, causing electric equipment failure or even safety accidents.

In the electric drive device, after the armature winding of the motor is disconnected or short-circuited, the line current in the motor winding will inevitably be unbalanced, resulting in an unbalanced electromagnetic torque generated by it, causing torque oscillation, noise or failure to output torque, affecting the normal operation of the equipment. work, and even endanger property and life safety.

As shown in Figure 2, in the schematic diagram of the circuit structure of the common high-current multi-phase motor and power converter in the prior art, the failure of the battery unit, power converter or multi-phase motor directly affects the electric drive device and electric equipment The reliability and safety of the machine, in the high-speed working state, the hazard is more serious.

High-power electric drives and electric equipment, especially low-voltage high-current electric drives and electric equipment, require controllers or power converters with large continuous operating currents, and related technologies and products are controlled and monopolized by individual countries and companies. As a result, the price is very high, and the line current value of the high-performance motor controller or power converter of the electric vehicle that can be purchased on the market is generally only below 1,000 amperes. In the final analysis, the manufacturing level limits the current value of a single power switch tube, the parallel current sharing technology of multiple power switch tubes cannot satisfy the linear law, or the control circuit and algorithm are too complicated, which seriously restricts and affects the low-voltage and high-current motor. Development of drives and electric equipment.

In addition, in high-power, especially megawatt-class motors, the current value far exceeds the maximum continuous operating current that the power conversion tube can withstand, so the line current is reduced by increasing the phase number of the motor. However, the increase in the number of phases increases the cost, difficulty and complexity of production because it is different from traditional design, manufacturing and control methods. When the relevant technology is not yet mature, it cannot be applied and popularized, which restricts and affects the development of high-power motors, electric drive devices and electric equipment, especially electric military equipment.

In summary, these problems have seriously affected the development of high-power electric equipment, including low-voltage high-current electric vehicles, electric boats, and even electric chariots, electric warships, electric aircraft, and electric-driven aircraft carriers for national defense.

Utility model content

The utility model is developed to solve the above problems, and aims to provide an electric drive fault-tolerant device with fault-tolerant function, a multi-phase motor, a power converter and electric equipment.

<Structure 1>

The utility model provides an electric drive fault-tolerant device, which is arranged in the electric equipment and is used to drive the electric equipment, comprising: a multi-phase motor, the phase number of the multi-phase motor winding is k, and has rated line voltage and rated line current; The DC power supply has a constant voltage corresponding to the rated line voltage of the multi-phase motor, and is used to provide the line current corresponding to the rated line current; the command sending part, which corresponds to the value of the rotational speed or torque output by the multi-phase motor The command signal; the current sensor, detects the line current of the multi-phase winding unit that constitutes the multi-phase motor winding, and sends the corresponding current feedback signal; the output sensor, detects the output speed or torque of the multi-phase motor, and sends the corresponding output feedback signal; the battery management unit detects the capacity, voltage and temperature of the battery unit that constitutes the DC power supply, and generates a corresponding battery feedback signal; the controller calculates and outputs the motor control signal according to the command signal, current feedback signal and output feedback signal, according to The battery feedback signal calculates and outputs the operation control signal of the drive unit; the driver, under the action of the operation control signal, enters the working state or the stop state, and generates a driving signal according to the operation control signal in the working state; the power converter, under the action of the driving signal The DC power is converted into the line current required by the multi-phase motor, wherein the multi-phase motor winding has j+i multi-phase winding units independent of each other and with the same parameters, and the DC power supply has j+i independent of each other with the same parameters The power converter has j+i independent power conversion units with the same parameters connected to j+i polyphase winding units and j+i battery units in one-to-one correspondence, and each power conversion unit has k A power conversion circuit provides k line currents to the corresponding multi-phase winding units, the driver has j+i driving units that are independent of each other and have the same parameters, and are connected to j+i power conversion units respectively, and k is a positive integer greater than 2 , j is a positive integer greater than 1, i is a redundant number and a natural number.

The electric drive fault-tolerant device provided by the utility model can also have such technical features: wherein, when the single power conversion circuit of the power conversion unit normally outputs the maximum effective value of the continuous working current I ₁ , the maximum effective value of the line current of the multi-phase motor When I _N , the number j of multi-phase winding units satisfies the following condition: j>I _N ÷ I ₁ , where j is a positive integer greater than 1.

The electric drive fault-tolerant device provided by the utility model can also have such technical features: wherein, the battery unit is composed of a plurality of battery cells connected in series or composed of a plurality of battery cells connected in series and parallel.

The electric drive fault-tolerant device provided by the utility model can also have such technical features: wherein, the multi-phase motor is any one of asynchronous motor, synchronous motor, switched reluctance motor, brushless DC motor, stepping motor, and the multi-phase The number of parallel windings of the motor winding can be divisible by the number j+i of the multi-phase winding unit, and the number of winding phases, winding phase sequence, winding turns, winding connection method and rated voltage of the multi-phase motor winding and the multi-phase winding unit are the same .

The electric drive fault-tolerant device provided by the utility model can also have such technical features: wherein, the power conversion unit is composed of an intelligent power module or includes a plurality of power switch tubes of the same type and parameter, and the power switch tube is an electric field effect Transistors (Power MOSFETs), Gate Turn-Off Thyristors (GTOs), Integrated Gate Commutated Thyristors (IGCTs), Insulated Gate Bipolar Transistors (IGBTs), Power Bipolar Transistors (GTRs) and Gate Commutated Thyristors (SGCT) in any one.

<Structure 2>

Further, the utility model also provides a power converter with a fault-tolerant function, and a multi-phase winding unit with k phases, rated line voltage and rated line current, and containing j+i multi-phase winding units that are independent of each other and have the same parameters Phase motor, and j+i battery units with constant voltage and used to provide the same parameters corresponding to the rated line current are connected respectively, and are used to provide DC power to the multi-phase motor according to the drive signal output by the driver , is characterized in that it includes: j+i power conversion units corresponding to j+i multi-phase winding units and j+i battery units respectively, wherein each power conversion unit has k independent and identical parameters The power conversion circuit, so as to provide k line currents to the corresponding multi-phase winding unit, k is a positive integer greater than 2, j is a positive integer greater than 1, i is a redundant number and is a natural number.

<Structure 3>

Further, the utility model also provides a multi-phase motor with fault tolerance function, the number of armature winding phases is k, with rated line voltage and rated line current, and j+i power conversion units that are independent of each other and have the same parameters connected to each other, the power conversion unit converts the direct current output from j+i battery units with constant voltage independent of each other and with the same parameters into the line current required by the multi-phase motor according to the drive signal, which is characterized in that it includes: at least one set The multi-phase motor winding, the number of phases is k, has j+i multi-phase winding units that are independent of each other and have the same parameters corresponding to j+i power conversion units, wherein each multi-phase winding unit receives each k is a positive integer greater than 2, j is a positive integer greater than 1, and i is a redundant number and a natural number.

<Structure 4>

Further, the utility model also provides an electric device including the above-mentioned electric drive fault-tolerant device.

Function and effect of utility model

According to the electric drive fault-tolerant device, multi-phase motor, power converter and electric equipment involved in the utility model, the j+i drive units are all independent from each other and have the same parameters, and the j+i battery units are all independent from each other and have the same parameters. Similarly, the j+i power conversion units are independent of each other and have the same parameters, and the j+i multi-phase winding units are also independent of each other and have the same parameters, and each drive unit is connected to a battery unit and a power conversion unit and a polyphase winding unit. Under normal conditions, only j battery units, j power conversion units and j multi-phase winding units are needed to ensure the normal operation of electric drive fault-tolerant devices and electric equipment, and the other i battery units, i power conversion units and i The multi-phase winding units are redundant, which helps to improve the reliability of the system. Therefore, when any battery unit, power conversion unit, multi-phase winding unit or drive unit fails, the electric drive fault-tolerant device and electric equipment of the present utility model can detect and calculate the battery feedback signals of all battery management units, all multi-phase winding The faulty battery unit, drive unit, power conversion unit or multi-phase winding unit can be judged by the line current value of the same phase of the unit, and the controller outputs the operation control signal to make the corresponding drive unit invalid, so that the damaged battery unit, drive unit, The power conversion unit or multi-phase winding unit is shielded and isolated. When the number of shields is less than or equal to i, the motor can run normally. When the number of shields is greater than i, the motor can maintain light-load operation to prevent performance loss caused by sudden failures during operation. Unnecessary losses caused by index mutations, especially greatly reduce the safety accidents of electric equipment running at high speed.

In addition, during the start-up process, during the emergency reverse braking process, and when performing emergency tasks, a larger motor current is required. At this time, the redundant i battery units, i drive units, and i power conversion units can be converted Units and i multi-phase winding units are partially or fully put into use to increase the current of the multi-phase motor, thereby increasing the output speed or torque, or reducing the current of a battery unit, power conversion unit and multi-phase winding unit to reduce the battery unit The calorific value and temperature rise of body, power switch tube and motor improve the speed, safety and flexibility of electric drive fault-tolerant devices and electric equipment.

According to the power converter involved in the utility model, it includes j+i power conversion units that are independent of each other and have the same parameters. There is no technical problem of parallel current sharing between them, and the output current satisfies the linear superposition relationship. +i value, the output current of the power converter can be easily increased. It not only breaks foreign technology monopoly, improves reliability and safety, reduces technical difficulty and production cost, but also facilitates the development of high-power, even hundreds of megawatts, electric military equipment.

According to the multi-phase motor involved in the utility model, it includes j+i multi-phase winding units which are independent from each other and have the same parameters, and their line currents satisfy a linear superposition relationship. For high-power multi-phase motors, especially low-voltage and high-current multi-phase motors, the line current of each multi-phase winding unit can be easily reduced by increasing the value of j+i multi-phase winding units. Not only is it beneficial to reduce the requirements on the output current of the power converter, but also reduce the requirements on heat generation and insulation of the connecting wire between the power converter and the motor and the junction box of the motor. Furthermore, the mature design, manufacture and control methods of multi-phase motors with conventional phases (such as three-phase motors) can be used, which reduces the cost, difficulty and complexity of production. On the basis of the polyphase motor involved in the utility model, it is vigorously developed for high-power, even electric military equipment of hundreds of megawatts.

To sum up, the electric drive fault-tolerant device of the utility model has the advantages of simple and reasonable structural design, low cost, low calorific value, stable working performance, fast response, safety and reliability, and long service life.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of an electric drive fault-tolerant device in an embodiment of the present invention; and

Fig. 2 is a schematic diagram of a circuit structure of a common high-current multi-phase motor and a power converter in the prior art.

detailed description

The specific embodiment of the utility model is described below in conjunction with accompanying drawing.

The electric drive fault-tolerant device 10 is set in electric equipment such as electric tools, quadcopters, electric vehicles, electric boats, electric forklifts, and electric military equipment, and is used to drive electric equipment.

FIG. 1 is a schematic diagram of the circuit structure of the electric drive fault-tolerant device in this embodiment.

As shown in FIG. 1 , an electric drive fault-tolerant device 10 includes a multiphase motor 11, a DC power supply 12, a command sending unit 13, a current sensor 14, an output sensor 15, a battery management unit 16, a controller 17, a driver 20, and a power converter 21 .

The multi-phase motor 11 has k phases and has a rated line voltage and a rated line current. The multi-phase motor 11 is any one of an asynchronous motor, a synchronous motor, a switched reluctance motor, a brushless DC motor, and a stepping motor. In this embodiment, the multi-phase motor 11 is an asynchronous motor.

The multiphase motor 11 has an armature and multiphase motor windings mounted on the armature. In this embodiment, the number of sets of multi-phase motor windings is the same as the number of armatures. When the number of armatures is two or more, two or more sets of multi-phase motor windings are used. Each set of multi-phase motor windings includes j+i multi-phase winding units 111 that are independent of each other and have the same parameters. The number of j+i can be averagely split by the number of parallel windings of the multi-phase motor 11 windings. The number of j greater than or equal to 2. Before and after splitting, the number of winding phases, winding phase sequence, winding turns, winding connection mode and rated voltage of the polyphase motor winding and j+i polyphase winding units remain unchanged.

In this embodiment, k is three, that is, the multi-phase motor 11 is a three-phase motor, correspondingly, the multi-phase winding unit 111 is a three-phase winding unit, and each three-phase winding unit has three independent windings A, B, c.

The DC power supply 12 has a constant voltage corresponding to the rated line voltage of the multi-phase motor 11, and is used to provide j+i independent battery units with the same parameters corresponding to the rated line current of the motor.

The command transmission unit 13 transmits a command signal corresponding to the value of the rotation speed or torque output by the multi-phase motor 11 .

The current sensor 14 detects the C-phase line current output by the power conversion unit and outputs a corresponding current feedback signal. The current feedback signal is received by the controller 17 .

The output sensor 15 detects the rotational speed or torque output by the multi-phase motor and outputs a corresponding output feedback signal. The output feedback signal is received by the controller 17 .

The controller 17 calculates and outputs the motor control signal 18 and the operation control signal 19 of the drive unit according to the command signal from the command sending unit 13, the current feedback signal from the current sensor 14, the output feedback signal from the output sensor 15, and the battery feedback signal from the battery management unit 16. .

The driver 20 controls the power conversion unit to output signals of current required by the multi-phase motor 11 according to the motor control signal 18 . The driver 20 generates a drive signal to drive the power conversion circuit to work according to the operation control signal 19 in the working state.

The driver 20 has j+i driving units 201 that are independent from each other and have the same parameters. Each driving unit 201 receives the same signal from the controller 17 at the same time. connected. The driving unit 201 enters the working state or the stopping state according to the operation control signal 19 . Each drive unit 201 can send A-phase drive signal, B-phase drive signal and C-phase drive signal, and the three-phase drive signal respectively drives the A-phase power conversion circuit 211a, the B-phase power conversion circuit 211b and the C-phase power conversion circuit 211c The power switch in the tube is turned on or off.

The power converter 21 converts the DC power into the voltage and current required by the multi-phase motor 11 under the action of the driving signal. The power converter 21 includes j+i power conversion units 211 respectively corresponding to the j+i multi-phase winding units 111 .

Each power conversion unit 211 has three parallel-connected A-phase power conversion circuits 211a, B-phase power conversion circuits 211b and C-phase power conversion circuits 211c with the same structure and parameters. The A-phase power conversion circuit 211a is connected to the connection point of the A-phase winding and the C-phase winding in the winding unit 111, the B-phase power conversion circuit 211b is connected to the connection point of the B-phase winding and the A-phase winding in the winding unit 111, and the power conversion circuit 211c The connection points of the C-phase winding and the B-phase winding in the winding unit 111 are connected to provide line currents to corresponding multi-phase winding units respectively.

Each power conversion circuit contains two power switch tubes. The two power switches have the same maximum continuous operating current. Only when the operating current is below the maximum continuous operating current, can the power switch tube run stably for a long time. If the operating current exceeds this current value, the power switch tube will be broken down and damaged due to overcurrent.

In this embodiment, the power conversion unit 211 may be composed of an intelligent power module, or may be composed of a plurality of power switch tubes of the same type and parameters.

The power switch tube is a power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an integrated gate commutation thyristor (IGCT), an insulated gate bipolar transistor (IGBT), and a power bipolar transistor ( GTR) and gate commutated thyristor (SGCT).

In this embodiment, j+i mutually independent drive units 201 are respectively connected to j+i mutually independent power conversion units 211 with the same parameters, and j+i mutually independent multiphase winding units with the same parameters 111 for power supply.

The number i of the multi-phase winding units in this embodiment is a natural number, j is an integer and satisfies the following conditions: j>I _N ÷ I ₁ , where I ₁ is the maximum normal output of a single power conversion circuit of the power conversion unit The RMS value of the continuous working current, I _N is the RMS value of the maximum line current of the polyphase motor.

For the DC power supply 12, the j+i battery units are mutually independent and have the same parameters, and there is no electrical coupling between them, and the i battery units are redundant. Since the j+i battery cells are not connected in parallel, the capacity of the DC power supply is equal to the product of the capacity and the number of the battery cells, which avoids the attenuation of the effective capacity of the battery. If the battery cells inside the battery unit are all connected in series, and there is no parallel connection, the effect will be better.

For the power converter 21 , the output current of any power conversion unit 211 is only related to its connected multi-phase winding unit, and has no electrical coupling relationship with other multi-phase winding units and their corresponding power conversion units. That is to say, there is no phenomenon of parallel connection of power switch tubes, therefore, the problem of parallel connection of power switch tubes for current sharing in the high-current motor drive device is eliminated.

In the electric drive fault-tolerant device 10, each drive unit is connected with a power conversion unit and a multi-phase winding unit. The driving unit outputs a driving signal in a working state, and does not output a driving signal in a stopped state.

When the electric drive fault-tolerant device 10 is in a stable working state, the controller outputs j operation control signals to make j driving units and their corresponding j battery units, j power conversion units and j multi-phase winding units in the working state, and output The i operation control signals make i drive units and their corresponding i battery units, i power conversion units and i multiphase winding units in a stop state. Among them, the j operation control signals can be used to control fixed j drive units, or can be selected in turn to control j drive units whose corresponding battery units, power conversion units and multi-phase winding units are not faulty. When the number of failures of the drive unit and its connected battery units, power conversion units and multi-phase winding units is greater than i, the controller outputs a running control signal to make all the remaining drive units in the working state and limit the maximum output speed of the motor or Torque, work at low speed or light load.

When the electric drive fault-tolerant device 10 is in the starting process, the emergency reverse connection braking process, and the execution of emergency tasks, etc., the j+i battery units, j+i power conversion units and j+i multi-phase winding units can be used without Put all the faulty parts into use, increase the current of the multi-phase motor, and then increase the output speed or torque, or reduce the current of the battery unit, power conversion unit and multi-phase winding unit to reduce the calorific value and heat generation of the battery, power switch tube and motor Temperature rise, improving the speed, safety and flexibility of electric drive fault-tolerant devices and electric equipment.

Function and effect of embodiment

According to the electric drive fault-tolerant device and the electric equipment involved in this embodiment, the j+i drive units are independent of each other and have the same parameters, the j+i battery units are all independent of each other and have the same parameters, and the j+i power The conversion units are independent of each other and have the same parameters, and the j+i multi-phase winding units are also independent of each other and have the same parameters. Each driving unit is connected to a battery unit, a power conversion unit and a multi-phase winding unit. Under normal conditions, only j battery units, j power conversion units and j multi-phase winding units are needed to ensure the normal operation of electric drive fault-tolerant devices and electric equipment, and the other i battery units, i power conversion units and i The multi-phase winding units are redundant, which helps to improve the reliability of the system. Therefore, when any battery unit, power conversion unit, multi-phase winding unit or drive unit fails, the electric drive fault-tolerant device and electric equipment of this embodiment can detect and calculate the battery feedback signals of all battery management units, all multi-phase winding The faulty battery unit, drive unit, power conversion unit or multi-phase winding unit can be judged by the line current value of the same phase of the unit, and the controller outputs the operation control signal to make the corresponding drive unit invalid, so that the damaged battery unit, drive unit, The power conversion unit or multi-phase winding unit is shielded and isolated. When the number of shields is less than or equal to i, the motor can run normally. When the number of shields is greater than i, the motor can maintain light-load operation to avoid performance failure due to sudden failures during operation. Unnecessary losses are caused by index mutations, especially the safety accidents of electric equipment running at high speed are greatly reduced.

In addition, during the start-up process, during the emergency reverse braking process, and when performing emergency tasks, a larger motor current is required. At this time, the redundant i battery units, i drive units, and i power conversion units can be converted Units and i multi-phase winding units are partially or fully put into use to increase the current of the multi-phase motor, thereby increasing the output speed or torque, or reducing the current of a battery unit, power conversion unit and multi-phase winding unit to reduce the battery unit The calorific value and temperature rise of body, power switch tube and motor improve the speed, safety and flexibility of electric drive fault-tolerant devices and electric equipment.

According to the power converter involved in this embodiment, it includes j+i mutually independent power conversion units with the same parameters, there is no technical problem of parallel current sharing among them, and the output current satisfies the linear superposition relationship, as long as j +i value, the output current of the power converter can be easily increased. It not only breaks foreign technology monopoly, improves reliability and safety, reduces technical difficulty and production cost, but also facilitates the development of high-power, even hundreds of megawatts, electric military equipment.

According to the multi-phase motor involved in this embodiment, it includes j+i multi-phase winding units that are independent of each other and have the same parameters, and their line currents satisfy a linear superposition relationship. For high-power multi-phase motors, especially low-voltage and high-current multi-phase motors, the line current of each multi-phase winding unit can be easily reduced by increasing the value of j+i multi-phase winding units. It is beneficial to reduce the requirements on the output current of the power converter, and reduce the heating and insulation requirements of the connecting wire between the power converter and the motor and the motor junction box. Moreover, mature design, manufacture and control methods of multi-phase motors with conventional phase numbers (such as three-phase motors) can be utilized, reducing the cost, difficulty and complexity of production. On the basis of the multi-phase motor of this embodiment, it is vigorously developed for high-power, even hundreds of megawatt-level electric military equipment.

To sum up, the electric drive fault-tolerant device of this embodiment has the advantages of simple and reasonable structural design, low cost, low heat generation, stable working performance, fast response, safety and reliability, and long service life.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model.

Claims (8)

1. An electric drive fault-tolerant device, arranged in an electric device, for driving the electric device, comprising: Multi-phase motors, the number of phases of the multi-phase motor windings is k, with rated line voltage and rated line current; a DC power supply having a constant voltage corresponding to said rated line voltage of said polyphase motor for providing a line current corresponding to said rated line current; a command sending unit, sending a command signal corresponding to the value of the rotational speed or torque output by the multi-phase motor; a current sensor for detecting the line current of the multi-phase winding units constituting the multi-phase motor winding, and sending a corresponding current feedback signal; An output sensor for detecting the rotational speed or torque output by the multi-phase motor, and sending a corresponding output feedback signal; A battery management unit, detecting the capacity, voltage and temperature of the battery units constituting the DC power supply, and generating a corresponding battery feedback signal; a controller, calculating and outputting a motor control signal according to the instruction signal, the current feedback signal and the output feedback signal, and calculating and outputting an operation control signal of the driving unit according to the battery feedback signal; The driver enters the working state or the stopping state under the action of the operation control signal, and generates a driving signal according to the operation control signal in the working state; and a power converter, under the action of the driving signal, converts the direct current into the line current required by the multi-phase motor, It is characterized by: Wherein, the multi-phase motor winding has j+i multi-phase winding units that are independent from each other and have the same parameters, The DC power supply has j+i battery units that are independent of each other and have the same parameters, The power converter has j+i mutually independent power conversion units with the same parameters connected to the j+i multi-phase winding units and the j+i battery units in one-to-one correspondence, Each of the power conversion units has k power conversion circuits to provide k line currents to the corresponding multi-phase winding unit, The driver has j+i driving units that are independent of each other and have the same parameters, and are respectively connected to j+i power conversion units, The k is a positive integer greater than 2, the j is a positive integer greater than 1, and the i is a redundant number and a natural number. 2. The electric drive fault-tolerant device according to claim 1, characterized in that: Wherein, when the maximum continuous operating current effective value normally output by a single power conversion circuit of the power conversion unit is I ₁ , and the maximum line current effective value of the multi-phase motor is I _N , each of the multi-phase winding units The number j satisfies the following conditions: j>I _N ÷ I ₁ , Wherein, j is a positive integer greater than 1. 3. The electric drive fault-tolerant device according to claim 1, characterized in that: Wherein, the battery unit is composed of a plurality of battery cells connected in series or composed of a plurality of battery cells connected in series and parallel. 4. The electric drive fault-tolerant device according to claim 1, characterized in that: Wherein, the multi-phase motor is any one of an asynchronous motor, a synchronous motor, a switched reluctance motor, a brushless DC motor, and a stepping motor, The number of parallel windings of the multi-phase motor windings can be divisible by the number j+i of the multi-phase winding units, The number of winding phases, winding phase sequence, number of winding turns, winding connection method and rated voltage of the multi-phase motor winding and the multi-phase winding unit are the same. 5. The electric drive fault-tolerant device according to claim 1, characterized in that: Wherein, the power conversion unit is composed of an intelligent power module or includes a plurality of power switch tubes of the same type and parameters, The power switching tube is a power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an integrated gate commutation thyristor (IGCT), an insulated gate bipolar transistor (IGBT), and a power bipolar transistor (GTR) and gate commutated thyristor (SGCT) either. 6. A power converter with a fault-tolerant function, and a multi-phase motor with k phases, rated line voltage and rated line current, j+i multi-phase winding units independent of each other and with the same parameters, and a constant voltage and is used to provide j+i battery units that are independent of each other and have the same parameters corresponding to the rated line current and are connected to each other, and are used to provide DC power to the multi-phase motor according to the drive signal output by the driver. In, including: j+i power conversion units corresponding to the j+i multi-phase winding units and the j+i battery units respectively, Wherein, each of the power conversion units has k mutually independent power conversion circuits with the same parameters, so as to provide k line currents to the corresponding multi-phase winding units, The k is a positive integer greater than 2, the j is a positive integer greater than 1, and the i is a redundant number and a natural number. 7. A multi-phase motor with fault-tolerant function, the number of armature winding phases is k, with rated line voltage and rated line current, connected with j+i independent power conversion units with the same parameters, the power According to the drive signal, the conversion unit converts the direct current output from j+i battery units with constant voltage independent of each other and with the same parameters into the line current required by the multi-phase motor, which is characterized in that it includes: At least one group of multi-phase motor windings, the number of phases of which is k, has j+i multi-phase winding units that are independent from each other and have the same parameters corresponding to the j+i power conversion units, wherein each of the The multi-phase winding unit receives k line currents provided by k parallel-connected power conversion circuits in each of the power conversion units, The k is a positive integer greater than 2, the j is a positive integer greater than 1, and the i is a redundant number and a natural number. 8. An electric device, characterized in that it comprises: The electric drive fault-tolerant device according to any one of claims 1-5.