Motor driver testing device and control method

Abstract

The invention provides a motor driver testing device and a control method, and relates to the technical field of motor driver testing, the motor driver testing device comprises a control unit, a sensor simulation box, a motor simulation unit, a battery simulation unit and an isolation transformer, the isolation transformer comprises a battery winding and a motor winding, the battery winding is connected with the alternating current end of the battery simulation unit, the direct current end of the battery simulation unit is used for being connected with the direct current end of a motor driver to be tested, the motor winding is connected with one alternating current end of the motor simulation unit, and the other alternating current end of the motor simulation unit is used for being connected with the alternating current end of the motor driver. The control unit is in communication connection with the sensor simulation box, the battery simulation unit and the motor simulation unit, and the sensor simulation box is used for being in communication connection with a motor driver. According to the invention, the test efficiency of the motor driver can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor driver testing, and in particular to a motor driver testing device and a control method. Background Art

[0002] The motor drive is an integral part of electric vehicles, and its performance directly affects the efficiency and reliability of the vehicle. Therefore, testing the motor drive is particularly important, as it can not only evaluate its working status, but also detect potential problems in a timely manner, thereby ensuring the normal operation of the vehicle.

[0003] However, traditional motor drive test benches require a lot of time to build and debug because of their wide variety of components and complex systems. In addition, the high failure rate of traditional motor drive test benches may cause test interruptions, affecting the test efficiency of the motor drive. Summary of the invention

[0004] The problem solved by the present invention is how to improve the test efficiency of the motor driver.

[0005] In order to solve the above problems, the present invention provides a motor driver testing device and a control method.

[0006] In a first aspect, the present invention provides a motor driver testing device, comprising a control unit, a sensor simulation box, a motor simulation unit, a battery simulation unit and an isolation transformer, wherein the isolation transformer comprises a battery winding and a motor winding, the battery winding is connected to an AC end of the battery simulation unit, the DC end of the battery simulation unit is used to be connected to a DC end of a motor driver to be tested, the motor winding is connected to an AC end of the motor simulation unit, the other AC end of the motor simulation unit is used to be connected to an AC end of the motor driver, the control unit is respectively connected to the sensor simulation box, the battery simulation unit and the motor simulation unit for communication, and the sensor simulation box is used to be connected to the motor driver for communication;

[0007] The control unit is used to adjust the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test status of the motor driver.

[0008] Optionally, adjusting the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test state of the motor driver includes:

[0009] When performing an electric state test, respectively controlling the working modes of the battery simulation unit and the motor simulation unit to be adjusted to an electric mode;

[0010] When a braking state test is performed, the working modes of the battery simulation unit and the motor simulation unit are respectively controlled to be adjusted to a braking mode.

[0011] Optionally, the control unit is further used for:

[0012] Acquiring sampling information from the motor simulation unit, wherein the sampling information includes current sampling information and voltage sampling information;

[0013] Generate corresponding motor state information according to the sampling information, wherein the motor state information includes motor position information and motor speed information;

[0014] The motor state information is sent to the sensor simulation box, and corresponding sensor waveform information generated by the sensor simulation box according to the motor state information is sent to the motor driver.

[0015] Optionally, the battery winding includes a first battery winding and a second battery winding, the battery simulation unit includes a first battery power module and a second battery power module, the first battery winding is connected to the AC end of the first battery power module, the second battery winding is connected to the AC end of the second battery power module, and the DC end of the first battery power module and the DC end of the second battery power module are connected in series for connection to the DC end of the motor driver.

[0016] Optionally, the first battery power module includes a first battery rectifier component and a first step-down component, the AC end of the first battery rectifier component is connected to the first battery winding, the DC end of the first battery rectifier component is connected to the high-voltage end of the first step-down component, and the low-voltage end of the first step-down component serves as the DC end of the first battery power module.

[0017] Optionally, the second battery power module includes a second battery rectifier component and a second step-down component, the AC end of the second battery rectifier component is connected to the second battery winding, the DC end of the second battery rectifier component is connected to the high voltage end of the second step-down component, and the low voltage end of the second step-down component is connected in series with the low voltage end of the first step-down component for connection to the DC end of the motor driver.

[0018] Optionally, the motor winding includes a first motor winding and a second motor winding, and the motor simulation unit includes a first motor power module and a second motor power module, the AC end of the first motor power module is connected to the first motor winding, the AC end of the second motor power module is connected to the second motor winding, and the other AC end of the first motor power module and the other AC end of the second motor power module are connected in parallel for connection to the AC end of the motor driver.

[0019] Optionally, the first motor power module includes a first motor rectifier component and a first inverter component, the AC end of the first motor rectifier component is connected to the first motor winding, the DC end of the first motor rectifier component is connected to the DC end of the first inverter component, and the AC end of the first inverter component serves as the other AC end of the first motor power module.

[0020] Optionally, the second motor power module includes a second motor rectifier component and a second inverter component, the AC end of the second motor rectifier component is connected to the second motor winding, the DC end of the second motor rectifier component is connected to the DC end of the second inverter component, and the AC end of the second inverter component is connected in parallel with the AC end of the first inverter component for connection to the AC end of the motor driver.

[0021] In a second aspect, the present invention provides a control method for a motor driver test device. Based on the motor driver test device described in the first aspect, the control method for the motor driver test device includes:

[0022] According to the acquired test status of the motor driver, the working modes of the motor simulation unit and the battery simulation unit are adjusted respectively.

[0023] The beneficial effects of the motor driver test device and control method of the present invention are: by connecting the battery simulation unit and the motor simulation unit to the motor driver, the electrical relationship between the battery and the motor in the actual operation of the motor can be well simulated, so that the entire test device can simulate the working environment of the motor driver in the real device, and provide more real and reliable conditions for the test. Compared with the traditional motor driver test bench, the test device has a simple structure, does not need to prepare a large number of physical parts, can quickly complete the construction of the test environment, greatly reduce the length of the early construction, and at the same time, during debugging, there is no need to adjust one by one for many hardware like the traditional bench, and can enter the test state more quickly, greatly improving the test efficiency of the motor driver. For example, in the test of the electric vehicle motor driver, the coordinated working situation of the motor and the battery is complicated. Through this system, the working state of the motor driver under different driving conditions such as vehicle acceleration, deceleration, and climbing can be accurately simulated. The control unit is connected to the sensor simulation box, the battery simulation unit, and the motor simulation unit in communication, and can be dynamically adjusted according to the test state of the motor driver, and the working mode of the motor simulation unit and the battery simulation unit can be flexibly changed according to the different stages and requirements of the test. The sensor simulation box is connected to the motor driver in communication, and can simulate various sensor signals, so that the motor driver can receive feedback signals such as position and speed similar to those when the real motor is running, so as to comprehensively test the motor driver's processing ability for different sensor signals and the control performance under various feedback conditions, so as to observe the response of the motor driver to these signals and evaluate its performance under high-precision control requirements. Since the entire test device simulates the real working conditions instead of directly using real high-power motors and batteries for testing, it is more convenient to adjust parameters and simulate faults during the test process, which improves the efficiency of the test. At the same time, it avoids the potential safety hazards caused by the use of real high-energy equipment, such as battery short circuit, motor overload and other dangerous situations, so that the motor overload can be safely simulated without worrying about the real motor being damaged due to overload, which improves the efficiency and safety of the test. And through the control of the battery simulation unit and the motor simulation power supply, the test device has good compatibility and can be used to test motor drivers of different types and specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a motor driver testing device according to an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the electric state test of an embodiment of the present invention;

[0026] Figure 3 This is a structural schematic diagram of a braking state test according to an embodiment of the present invention;

[0027] Figure 4 A circuit diagram of a motor driver testing device according to an embodiment of the present invention;

[0028] Figure 5 The present invention is a flow chart of a control method of a motor driver testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0030] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0031] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0033] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0034] In the related art, the traditional motor drive test bench involves many different types of equipment, including motors of various specifications, complex controllers, various types of sensors (such as sensors for measuring speed, torque, temperature, current, voltage, etc.), various power analyzers, oscilloscopes and other measuring instruments, as well as huge electrical wiring systems and mechanical transmission devices. These devices come from different manufacturers and have different interface standards and communication protocols. A lot of integration and debugging work is required. This process requires professional technicians to spend a lot of time to sort out and coordinate the relationship between various devices. At the same time, due to the complexity and close connection of the traditional test bench, the failure rate is high, and various faults are prone to occur in components such as motors, controllers, sensors, and electrical circuits. Troubleshooting is difficult. Technicians need to use professional equipment to check components and circuits one by one. It takes a long time to determine the fault point, which can be as short as a few hours or as long as a few days. After finding the fault point, replacement parts often need to wait for specific accessories, especially imported or special specification parts. The waiting time is longer, and the overall repair cycle is long, which seriously affects the continuity and progress of the test work.

[0035] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a motor driver testing device and a control method.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a motor driver testing device, including a control unit, a sensor simulation box, a motor simulation unit, a battery simulation unit and an isolation transformer, the isolation transformer including a battery winding and a motor winding, the battery winding is connected to the AC end of the battery simulation unit, the DC end of the battery simulation unit is used to be connected to the DC end of the motor driver to be tested, the motor winding is connected to an AC end of the motor simulation unit, and the other AC end of the motor simulation unit is used to be connected to the AC end of the motor driver, the control unit is communicatively connected to the sensor simulation box, the battery simulation unit and the motor simulation unit respectively, and the sensor simulation box is used to be communicatively connected to the motor driver.

[0037] Specifically, the control unit can adopt the architecture design of field programmable gate array (FPGA) + dual-core ARM processor, which combines the high-speed parallel processing capability of FPGA and the powerful general computing and control functions of ARM processor. After receiving the test instruction, it will accurately control the test status of the motor simulation unit and the battery simulation unit according to the instruction content. During the operation of the test device, the control unit uses high-frequency sampling technology to collect data on the operating status of the motor simulation unit and the battery simulation unit at a very high frequency, such as obtaining the voltage and current changes of the battery simulation unit in real time through voltage sampling and current sampling, as well as the speed fluctuation and torque output of the motor simulation unit. At the same time, combined with high-frequency discrete modeling technology, an accurate mathematical model is constructed based on the pre-set motor and battery parameters, and complex calculations are performed on this model to obtain voltage and current instructions for controlling the battery simulation unit and the motor simulation unit. These instructions enable the battery simulation unit and the motor simulation unit to simulate electrical characteristics that are highly similar to the real motor and battery under the corresponding working conditions. In addition, the control unit will also send the speed information calculated by the kinematic equation to the sensor simulation box through the high-speed, stable data transmission channel of high-speed optical fiber, providing a basis for the sensor simulation box to generate accurate sensor feedback signals. For example, when simulating the motor acceleration process, the control unit obtains the voltage and current instructions corresponding to each time point through modeling operations based on the collected motor initial state parameters and the set acceleration target parameters, so that the battery simulation unit outputs the appropriate voltage and current, the motor simulation unit presents the corresponding acceleration electrical characteristics, and sends the calculated speed, position and other information to the sensor simulation box to complete the construction of the entire simulated acceleration scene.

[0038] Furthermore, the sensor simulation box is based on receiving information about the motor control from the control unit, which is usually data such as the angle or displacement of the motor rotor in digital form. The sensor simulation box uses a high-speed analog-to-digital converter and a digital-to-analog converter to convert these digital signals into analog output signals corresponding to various types of sensors, including output signal forms of common motor sensors such as rotary transformers (resolvers), encoders, Hall sensors, and eddy current sensors. These analog signals can accurately reflect the position and speed information of the motor, and then provide them to the motor driver. For example, for the simulation of the resolver sensor signal, the sensor simulation box generates corresponding sine and cosine analog voltage signals through a high-speed digital-to-analog converter based on the received motor position information, according to the signal encoding rules and electrical characteristics of the resolver, and its amplitude, frequency and phase relationship can accurately represent the current position and speed change of the motor, so that after the motor driver receives these signals, it can perform control algorithm calculations and output control signals as in the real motor operating environment, thereby realizing the performance test of the motor driver under different sensor feedback conditions.

[0039] In the battery simulation unit, a structural design including a rectifier component and a DC-DC power unit, and a plurality of DC-DC power units in cascade may be adopted, wherein a cascaded DC-DC power unit refers to a structure in which a plurality of DC-DC power units are connected in sequence, and each DC-DC power unit has its input and output ports. In the cascade structure, the output of the previous power unit is used as the input of the next power unit, and so on, just like a series chain, the purpose is to achieve a more complex voltage conversion function or meet specific power supply requirements. The battery simulation unit can achieve a high degree of simulation of the characteristics of a 1200V power battery under the precise control of the control unit. The cascade structure allows the flexible change of parameters such as output voltage and current by adjusting the working state and connection mode of each power unit to simulate the charging and discharging characteristics of the power battery under different working conditions. For example, in the simulated battery discharge process, according to the instructions from the control unit and the preset battery discharge curve, the various sub-units in the cascaded DC-DC power unit are controlled to gradually reduce the output voltage, and at the same time adjust the output current to match the voltage and current characteristics of the real power battery at the corresponding discharge depth, providing a realistic battery power supply environment for the motor driver, thereby testing the working performance of the motor driver under different battery power states, such as the efficient operation control capability when the battery is fully charged and the energy saving and stability control capability when the battery is low.

[0040] In the motor simulation unit, for example, a structural design including a rectifier component and a DC-AC power unit, and multiple DC-AC power units in staggered parallel connection can be adopted, wherein the DC-AC power unit is a device that converts DC power into AC power, and staggered parallel connection refers to connecting multiple identical or similar DC-AC power units in parallel, and the operation of these units is staggered in time. This connection method can effectively utilize the coordinated operation of multiple power units to improve the performance of the system. Under the control of the control unit, the staggered parallel structure can improve the power conversion efficiency and the output power quality, so that it can better simulate the voltage, current waveform and frequency characteristics of the motor port under different operating conditions. For example, when simulating the starting process of a motor, the interleaved parallel DC-AC power unit generates AC voltage and current waveforms similar to those when a real motor is started, including the initial high current shock, the gradually rising voltage amplitude, and the corresponding frequency change, based on the starting voltage and current instructions calculated by the control unit by adjusting the switching timing and on-duty cycle of the internal power tube. This allows the motor driver to perform starting control operations in this simulated motor port electrical characteristic environment, and then conducts comprehensive testing and evaluation of the motor driver's starting performance, torque control accuracy, current limiting capability, etc., to ensure that the motor driver can stably and reliably complete various starting tasks when actually driving the motor, and meet the performance requirements in different application scenarios.

[0041] The multi-winding isolation transformer realizes the electrical isolation between input and output, which can effectively prevent the interference signal, voltage fluctuation and possible electrical fault of the input side power grid from causing adverse effects on the battery winding and motor winding on the output side, and the motor simulation unit and the battery simulation unit, ensuring the stability and reliability of the system operation. At the same time, it also isolates the battery simulation unit and the motor simulation unit, which enables the battery simulation unit and the motor simulation unit to work in their own independent and stable electrical environment, avoiding the electromagnetic interference and current crosstalk that may arise between each other, and completely simulates the state of mutual isolation between the battery pack and the motor of the tested motor driver in the real application scenario. This isolation characteristic not only ensures the normal operation of each unit, but also provides a solid foundation in terms of safety, because in power electronic devices, electrical isolation is a key measure to prevent electric shock accidents, protect the safety of operators and prevent equipment damage. Compared with the traditional test bench, the power electronic device (with the help of components such as isolation transformers) used in the test device in this embodiment has better controllability. In the mechanical system, the adjustment of many parameters often needs to be achieved by changing the physical structure or replacing mechanical parts, and the process is relatively cumbersome and inflexible. In this test device, the control unit can accurately control the battery simulation unit, motor simulation unit, isolation transformer and other parts, so as to quickly and accurately adjust the simulated battery characteristics, motor characteristics and related parameters of power transmission and conversion, such as battery voltage and current output, motor speed and torque simulation, and distribution and conversion of electric energy between different units. In addition, three-terminal isolation between battery simulation, motor simulation and power grid is also achieved, which further improves the safety and reliability of the system. The three-terminal isolation design enables the system to effectively limit the spread of the fault range when facing power grid failure, battery abnormality or motor driver failure, and avoid mutual transmission of faults between different parts, thereby ensuring the safe and stable operation of the entire test system and the external power grid and other equipment connected to it.

[0042] Another important function of the isolation transformer is to establish a bidirectional power flow between the motor simulation unit and the battery simulation unit. In an actual motor drive system, the motor is sometimes in a power generation state (such as braking energy recovery) during operation, and the electric energy generated by the motor needs to be fed back to the battery or other energy storage device. The isolation transformer in this embodiment uses the motor windings and battery windings on the secondary side so that the electric energy generated by the motor simulation unit can be effectively transmitted back to the battery simulation unit for storage or other processing according to the system requirements and control strategies, thereby reducing energy waste and improving the energy utilization efficiency of the entire system. The primary winding of the isolation transformer is used to connect to the power grid.

[0043] It should be noted that in order to reduce the pollution to the power grid, a filter unit needs to be added between the power grid and the input end of the isolation transformer. For the power modules in the battery simulation unit and the motor simulation unit, the grid-connected rectifier will inevitably generate switching ripples during operation. If this ripple is not handled, it will cause serious pollution to the power grid, affect the power quality of the power grid, and may even interfere with the normal operation of other electrical equipment. The filter unit can effectively filter out these switching ripples through specific circuit design, such as the use of a filter network composed of filter elements such as inductors and capacitors, so that the output power is smoother and more stable, meeting the standard requirements for grid access. At the same time, the filter unit can suppress high-frequency interference signals caused by faults, so that the system can maintain stable operation as much as possible under the premise of safety, and reduce the adverse effects on the external power grid.

[0044] Furthermore, the device also includes a display and control unit, which is in communication with the control unit. The display and control unit is used by the operator to set battery-related parameters such as: battery type, number of series and parallel connections, initial internal resistance, initial temperature and initial state of charge (State of Charge, SOC), etc. The control unit is used to sample and feedback the battery mathematical model according to the parameters set by the received operation, collect the output voltage and current of the battery simulation unit for closed-loop control, and the buck module of the battery simulation unit simulates the battery load change curve in real time and outputs it to the DC side of the motor driver under test. Among them, the display and control unit is used by the operator to set the motor characteristic parameters such as: stator d-axis and q-axis mutual inductance (L d , L q ): These two parameters reflect the degree of magnetic field coupling inside the motor. Different values ​​will lead to different magnetic field orientations, directly changing the motor torque and speed output characteristics. The operator must input accurate values ​​to make the simulated motor operation characteristics meet expectations; stator resistance R s :The stator resistance will cause copper loss when the motor is running, which is related to the motor heating and efficiency. sValues ​​can make the simulated motor more accurate in energy consumption calculation and heat simulation; Magnetic flux Flux: It is related to the electromagnetic torque generation of the motor. The size of the magnetic flux directly determines the size of the motor output. Only by accurately setting it can the torque and speed curves of the simulated motor output reflect the actual motor performance; Moment of inertia J, friction coefficient F, pole pair number P: The moment of inertia affects the acceleration and deceleration performance of the motor, the friction coefficient determines the friction loss during operation, and the pole pair number is related to the synchronous speed of the motor. The operator sets these parameters in the display and control unit to fully outline the mechanical characteristics of the motor and provide a basis for the subsequent simulation test of the motor driver. The control unit establishes a motor mathematical model based on the input motor parameters and the real-time collected motor driver port voltage and output current, collects the motor simulation power unit output filter unit current and the filter unit three-phase voltage through voltage sampling and current sampling for closed-loop control, and generates a pulse width modulation (PulseWidth Modulation, PWM) wave to drive the motor simulation unit inverter module to output to the AC side of the tested motor driver. The simulated motor position and speed sensing information obtained by the motor model calculation is also sent to the resolver simulation unit through optical fiber communication.

[0045] The control unit is used to adjust the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test status of the motor driver.

[0046] Specifically, the control unit obtains the test status information of the motor driver, such as voltage, current, temperature, operation mode and fault conditions. According to the test status information, the control unit adjusts the working mode of the motor simulation unit. For example, when testing the acceleration performance of the motor driver, the control unit will increase the load torque of the motor simulation unit to simulate the actual resistance. Specifically, the alternating current will first pass through the rectifier component and be converted into direct current, that is, by adjusting the conduction angle of the transistor switch tube, the DC voltage of the rectifier output can be effectively raised to provide sufficient power for the subsequent inverter component. The inverter component converts the input direct current into alternating current again, and the output voltage is precisely controlled by adjusting the PWM duty cycle. The larger the duty cycle, the higher the average output voltage, so as to simulate the dynamic process of the motor winding current increasing as the torque increases when the motor is running. And after introducing the vector control algorithm, the system can also finely control the size and phase of the output current according to the actual torque demand, so as to simulate the change of load torque. When the simulated motor load torque increases, the control system will decisively increase the PWM duty cycle. If the initial duty cycle is only 30%, when it is increased to 60%, it means that more electrical energy is delivered to the motor per unit time, and the voltage across the motor increases accordingly. According to Ohm's law, the current of the motor winding will increase accordingly, and the electromagnetic torque will also increase accordingly. When testing the compatibility of different motor types, set the corresponding parameters of the motor simulation unit. For the battery simulation unit, the control unit adjusts its output voltage according to the input voltage requirements of the motor driver and the test conditions, such as simulating low-voltage battery startup or power change scenarios; it will also change the output current according to the motor load and operating status, and simulate different battery types and temperature characteristics, etc., in order to comprehensively test the performance of the motor driver under various conditions.

[0047] In this embodiment, the battery simulation unit and the motor simulation unit are connected to the motor driver, which can well simulate the electrical relationship between the battery and the motor in the actual operation of the motor, so that the entire test device can simulate the working environment of the motor driver in the real device, providing more real and reliable conditions for the test. Compared with the traditional motor driver test bench, the test device has a simple structure, does not need to prepare a large number of physical parts, can quickly complete the test environment construction, greatly reduce the early construction time, and at the same time, during debugging, there is no need to adjust one by one for many hardware like the traditional bench, and can enter the test state more quickly, greatly improving the test efficiency of the motor driver. For example, in the test of the electric vehicle motor driver, the coordinated work of the motor and the battery is complicated. Through this system, the working state of the motor driver under different driving conditions such as vehicle acceleration, deceleration, and climbing can be accurately simulated. The control unit is connected to the sensor simulation box, the battery simulation unit, and the motor simulation unit, and can be dynamically adjusted according to the test state of the motor driver. The working mode of the motor simulation unit and the battery simulation unit can be flexibly changed according to the different stages and requirements of the test. The sensor simulation box is connected to the motor driver in communication, and can simulate various sensor signals, so that the motor driver can receive feedback signals such as position and speed similar to those when the real motor is running, so as to comprehensively test the motor driver's processing ability for different sensor signals and the control performance under various feedback conditions, so as to observe the response of the motor driver to these signals and evaluate its performance under high-precision control requirements. Since the entire test device simulates the real working conditions instead of directly using real high-power motors and batteries for testing, it is more convenient to adjust parameters and simulate faults during the test process, which improves the efficiency of the test. At the same time, it avoids the potential safety hazards caused by the use of real high-energy equipment, such as battery short circuit, motor overload and other dangerous situations, so that the motor overload can be safely simulated without worrying about the real motor being damaged due to overload, which improves the efficiency and safety of the test. And through the control of the battery simulation unit and the motor simulation power supply, the test device has good compatibility and can be used to test motor drivers of different types and specifications.

[0048] Optionally, adjusting the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test state of the motor driver includes:

[0049] When performing an electric state test, respectively controlling the working modes of the battery simulation unit and the motor simulation unit to be adjusted to an electric mode;

[0050] When a braking state test is performed, the working modes of the battery simulation unit and the motor simulation unit are respectively controlled to be adjusted to a braking mode.

[0051] Specifically, Figure 2 As shown, during the electric state test, the working modes of the battery simulation unit and the motor simulation unit need to be adjusted to the corresponding electric mode. In the electric mode, the battery simulation unit is equivalent to a power supply, providing power to the entire system. It simulates the output characteristics of the real battery in the electric state, including parameters such as voltage and current. The battery simulation unit receives power from the power grid on the primary side of the power frequency isolation transformer, and provides power to the motor simulation unit through the motor driver to drive the motor simulation unit to operate. The motor simulation unit simulates the electric running state of the motor in the electric mode. It obtains power from the battery simulation unit and operates according to the preset motor characteristics. The motor simulation unit may simulate the speed, torque and other parameters of the motor. The motor simulation unit obtains power from the battery simulation unit and operates under the control of the motor driver to simulate the working conditions of the motor in the electric state, and feeds back the obtained power to the motor winding of the isolation transformer, and returns to the battery simulation unit through the battery winding on the corresponding secondary side, thereby realizing the recycling of power.

[0052] Furthermore, if Figure 3 As shown, in the braking test, the working modes of the battery simulation unit and the motor simulation unit need to be adjusted to the corresponding braking mode. In the braking mode, the battery simulation unit may simulate the charging process of the battery. The motor simulation unit generates electric energy feedback during braking, and the battery simulation unit receives and processes the feedback electric energy to simulate the charging characteristics of the battery during braking, such as changes in voltage and current. The motor simulation unit feeds back electric energy to the battery simulation unit during braking. The motor simulation unit simulates the braking operation state of the motor in the braking mode and feeds back electric energy to the battery simulation unit. The motor simulation unit will work according to the preset braking characteristics, such as braking torque, braking current, etc. The motor simulation unit feeds back electric energy to the battery simulation unit during braking, and the battery simulation unit then feeds back electric energy to the primary side of the isolation transformer or the battery winding, and returns to the motor simulation unit through the corresponding secondary side motor winding, thereby realizing energy recycling. By controlling the battery simulation unit and the motor simulation unit in the electric and braking modes, the performance of the motor drive under different working conditions can be accurately tested, including energy flow, energy conversion efficiency, etc.

[0053] It should be noted that the AC input of the test device of this embodiment connected to the power grid only provides a small amount of power consumption, which means that during the test process, less energy is obtained from the power grid, and most of the energy is circulated and utilized inside the device, thereby achieving energy-saving testing. Compared with the traditional bench test involving multi-stage conversion of mechanical energy and electrical energy, each stage of conversion will have energy loss. The test device of this embodiment reduces the energy loss caused by multi-stage conversion through internal energy circulation. For example, a traditional bench may need to convert electrical energy into mechanical energy (motor operation), and then convert mechanical energy into electrical energy (braking energy recovery). Each conversion will have losses, while the test device of this embodiment achieves more efficient energy conversion and utilization through internal battery simulators, motor simulators and motor controllers, reducing energy losses in the intermediate links, thereby improving the overall energy conversion efficiency.

[0054] Optionally, the control unit is further used for:

[0055] Acquiring sampling information from the motor simulation unit, wherein the sampling information includes current sampling information and voltage sampling information;

[0056] Generate corresponding motor state information according to the sampling information, wherein the motor state information includes motor position information and motor speed information;

[0057] The motor state information is sent to the sensor simulation box, and corresponding sensor waveform information generated by the sensor simulation box according to the motor state information is sent to the motor driver.

[0058] Specifically, Figure 1As shown in the figure, by obtaining the current sampling information and voltage sampling information of the motor simulation unit, the working state of the motor simulation unit can be reflected. During the operation of the motor, the current magnitude and direction will change with the motor load and the operation mode (electric or braking). For example, when the motor load increases, the current usually increases. The current and voltage in the motor simulation unit can be monitored in real time by high-precision current sensors and voltage sensors, and converted into digital signals. These sensors must have high sensitivity and fast response characteristics to accurately capture the dynamic changes of current and voltage. Then, the motor state information is generated according to the sampling information, and the motor position information and motor speed information are calculated based on the physical model and mathematical algorithm of the motor using the collected current and voltage sampling information. For the motor position information, it can be calculated based on the electromagnetic induction principle of the motor and the law of rotor motion, combined with the relationship between current, voltage and magnetic field. The motor speed information can be obtained by analyzing the frequency components of the current or voltage, or by using the proportional relationship between the back electromotive force of the motor and the speed. This requires complex calculation models and high-speed computing capabilities. For example, the FPGA in the control unit can use its parallel processing capabilities to quickly perform calculations. Finally, the motor status information is sent to the sensor simulation box, and the sensor simulation box generates the corresponding sensor waveform information and sends it to the motor driver. After receiving information such as the motor position and speed, the sensor simulation box performs signal modulation according to the characteristics of different types of sensors (such as resolvers, encoders, Hall sensors, eddy current sensors, etc.). For example, for resolvers, sine and cosine signals with specific frequencies and amplitudes are generated according to the motor position information; for encoders, corresponding pulse train signals are generated. These waveform information are transmitted to the motor driver after AD conversion. The motor driver adjusts the output according to these feedback signals to achieve precise control of the motor. For example, if the motor speed feedback information shows that the speed is too fast, the motor driver will reduce the output voltage or current, otherwise it will increase it, so as to ensure that the motor runs in the desired state.

[0059] In this optional embodiment, the control unit can capture the analog signal of the motor simulation unit in real time through the sensor simulation box, convert it into a digital signal and transmit it to the motor driver, so that the motor status information can be transmitted to the motor driver in a timely manner, ensuring the continuity and efficiency of the test process, enabling the test to quickly adapt to new working conditions, avoiding test stagnation or misjudgment due to information lag, thereby effectively improving test efficiency.

[0060] Optionally, the battery winding includes a first battery winding and a second battery winding, the battery simulation unit includes a first battery power module and a second battery power module, the first battery winding is connected to the AC end of the first battery power module, the second battery winding is connected to the AC end of the second battery power module, and the DC end of the first battery power module and the DC end of the second battery power module are connected in series for connection to the DC end of the motor driver.

[0061] Specifically, Figure 4 As shown, the first battery winding A1 and the second battery winding A2 are windings of the secondary side of the isolation transformer, and two three-phase filter inductors L are connected to the first motor winding A1 and the second motor winding A2 respectively. 11 and L 12 It is the front end of the circuit. Its main function is to filter the power from the secondary side of the isolation transformer, remove the high-frequency clutter and interference signals that may exist in it, and ensure that the subsequent circuit receives relatively pure power. 11 The first battery power module is connected to the AC end of the first battery power module, so that the electric energy is transferred from the first battery winding A1 to the AC end of the first battery power module, and converted into direct current by the first battery power module, and the second battery winding A2 is connected to the AC end of the first battery power module through the three-phase filter inductor L 12 Connected to the AC end of the second battery power module, so that the electric energy is transferred from the second battery winding A2 to the AC end of the second battery power module, and converted into DC power by the second battery power module. The DC end of the first battery power unit and the DC end of the second battery power unit are connected in series and then connected to the DC end of the motor driver, for example, the negative pole of the DC end of the first battery power module is connected to the positive pole of the DC end of the second battery power module, and the positive pole of the DC end of the first battery power module and the negative pole of the DC end of the second battery power module are connected to the positive and negative poles corresponding to the motor driver, so that the DC end of the first battery power module and the second battery power module are connected in series to the motor driver, thereby realizing the improvement of the DC end voltage of the battery simulation unit. In some test scenarios that require a higher DC voltage output, this cascade connection method can meet the requirements for the DC end power supply voltage of the motor driver, and can provide a more stable and higher voltage output compared to a single battery power module, and can simulate batteries of different types and capacities.

[0062] In this optional embodiment, voltage boosting is achieved by the coordinated work of two battery power modules in series, which can meet a variety of motor driver test scenarios with different voltage requirements. When faced with motor drivers of different models or designs, there is no need to replace or adjust complex external equipment to adapt the voltage. The appropriate voltage can be provided directly through the connection structure, which greatly saves the time spent on equipment adjustment and adaptation and maintains the continuity and efficiency of the test.

[0063] Optionally, the first battery power module includes a first battery rectifier component and a first step-down component, the AC end of the first battery rectifier component is connected to the first battery winding, the DC end of the first battery rectifier component is connected to the high-voltage end of the first step-down component, and the low-voltage end of the first step-down component serves as the DC end of the first battery power module.

[0064] In this optional embodiment, if Figure 4 As shown, the first battery power module includes a first battery rectifier component and a first step-down component. The function of the first battery rectifier component is to convert the AC power input from the first battery winding into a DC output to provide DC power for the motor driver. Its AC end is connected to the first battery winding, ensuring that the energy can be smoothly introduced into the first battery power module through the battery winding for processing. The DC end of the first battery rectifier component is connected to the high-voltage end of the first step-down component, so that the voltage is further adjusted through the first step-down component. The DC voltage after rectification can be stepped down as required to meet the specific requirements of the motor driver for DC voltage. The low-voltage end of the first step-down component is connected in series with the DC end of the second battery power module and then connected to the DC end of the motor driver. For example, the negative electrode of the first step-down component is connected to the positive electrode of the DC end of the second battery power module to form a series structure, and the positive electrode of the low-voltage end of the first step-down component and the negative electrode of the second battery power module are respectively connected to the positive and negative electrodes of the DC end of the motor driver, ensuring that the processed stable DC voltage can be accurately transmitted to the motor driver, providing the necessary power support for the normal operation of the motor driver. During the operation of the entire test device, this connection structure works in conjunction with other components to ensure the stability and reliability of the battery simulation unit supplying power to the motor driver. It should be noted that the first step-down component can be a BUCK converter, which is a DC-DC step-down converter that is extremely commonly used in the field of power electronics. Among them, the high-voltage end is the end of the first step-down component that receives a relatively high voltage in the circuit connection, and the low-voltage end is the end that receives a relatively low voltage.

[0065] Optionally, the second battery power module includes a second battery rectifier component and a second step-down component, the AC end of the second battery rectifier component is connected to the second battery winding, the DC end of the second battery rectifier component is connected to the high voltage end of the second step-down component, and the low voltage end of the second step-down component is connected in series with the low voltage end of the first step-down component for connection to the DC end of the motor driver.

[0066] In this optional embodiment, if Figure 4As shown, the second battery power module includes a second battery rectifier component and a second step-down component. The function of the second battery rectifier component is to convert the AC power input from the second battery winding into a DC output to provide DC power for the motor driver. Its AC end is connected to the second battery winding, ensuring that the energy can be smoothly introduced into the second battery power module through the battery winding for processing. The DC end of the second battery rectifier component is connected to the high-voltage end of the second step-down component, thereby achieving further voltage regulation through the second step-down component. The rectified DC voltage can be stepped down as required to meet the specific requirements of the motor driver for DC voltage. The low voltage end of the second buck component is connected in series with the DC end of the second battery power module and then connected to the DC end of the motor driver. For example, the positive electrode of the second buck component is connected to the negative electrode of the DC end of the first battery power module to form a series structure, and the positive electrode of the first battery power module and the negative electrode of the low voltage end of the second buck component and the positive electrode of the first battery power module are respectively connected to the positive and negative electrodes of the DC end of the motor driver, ensuring that the processed stable DC voltage can be accurately delivered to the motor driver, providing the necessary power support for the normal operation of the motor driver. During the operation of the entire test device, this connection structure works in coordination with other components to ensure the stability and reliability of the battery simulation unit supplying power to the motor driver. It should be noted that the second buck component can also be a BUCK converter, which is a DC-DC buck converter that is extremely commonly used in the field of power electronics. Among them, the high voltage end is the end of the second buck component with a relatively high voltage in the circuit connection, and the low voltage end is the end of the second buck component with a relatively low voltage in the circuit.

[0067] Optionally, the motor winding includes a first motor winding and a second motor winding, and the motor simulation unit includes a first motor power module and a second motor power module, the AC end of the first motor power module is connected to the first motor winding, the AC end of the second motor power module is connected to the second motor winding, and the other AC end of the first motor power module and the other AC end of the second motor power module are connected in parallel for connection to the AC end of the motor driver.

[0068] In this optional embodiment, if Figure 4 As shown, the first motor winding A3 and the second motor winding A4 are windings of the secondary side of the isolation transformer, and two three-phase filter inductors L connected to the first motor winding A3 and the second motor winding A4 are respectively 23 and L 24It is the front end of the circuit. Their main function is to perform preliminary filtering on the electric energy from the secondary side of the isolation transformer, filter out the high-frequency clutter and interference signals that may exist therein, and ensure that the subsequent circuit receives relatively pure electric energy. For example, in the actual power grid power supply environment, there may be some electromagnetic interference generated by other electrical equipment. These interference signals will exist in the input current in the form of high-frequency clutter. The three-phase filter inductor can effectively prevent these clutters from entering the subsequent circuit, thereby ensuring the stability and reliability of the system. The motor simulation unit includes a first motor power module and a second motor power module. The first motor winding A3 is connected to the power supply unit through a set of three-phase filter inductors L 23 Connected to the first motor power module, the second motor winding A4 is connected to the first motor power module through another set of three-phase filter inductors L 24 The outputs of the first motor power module and the second power module are respectively connected through the three-phase filter inductor L 21 and L 22 After being connected in parallel, it is connected to the AC end of the motor driver. In order to maintain the stability of the AC power entering the click driver, an output filter unit and a three-phase filter inductor L are connected in series at the output end of the motor simulation unit before connecting to the motor driver. 25 . During the test of the motor driver, some motor drivers may require higher power input to simulate complex working conditions or the operation of high-power motors. After the two motor power modules are connected in parallel, they can provide greater current and power to ensure that the motor driver will not be limited by insufficient power during the test. For the test of some high-performance electric vehicle motor drivers, the parallel power modules can better simulate the high power requirements of the motor under conditions such as high-speed driving and rapid acceleration, so that the test can fully cover the working range of the motor driver and avoid missing potential problems due to power limitations, thereby improving the integrity and accuracy of the test and thus improving the test efficiency. In addition, after the two motor power modules are connected in parallel, if one of the power modules fails, the other power module can still continue to maintain some functions to avoid sudden interruption of the entire test system. This not only reduces the test downtime caused by equipment failure, but also reduces the risk of test data loss or errors. During the long test process, this redundant design can ensure the continuity of the test, allowing testers to complete the test tasks more efficiently and improve the overall test efficiency.

[0069] Optionally, the first motor power module includes a first motor rectifier component and a first inverter component, the AC end of the first motor rectifier component is connected to the first motor winding, the DC end of the first motor rectifier component is connected to the DC end of the first inverter component, and the AC end of the first inverter component serves as the other AC end of the first motor power module.

[0070] In this optional embodiment, if Figure 4As shown, the first motor power module is mainly composed of a first motor rectifier component and a first inverter component. The AC end of the first motor rectifier component is connected to the first motor winding B1 in the isolation transformer. The isolation transformer can convert the voltage and electrically isolate the electric energy input from the power grid, provide a suitable voltage level for the subsequent motor simulation, and ensure the safety of the system. The AC power from the power grid is transmitted to the first motor rectifier component through the first motor winding B1 of the isolation transformer. The first rectifier component uses its internal diodes or thyristors and other rectifier elements to convert the AC current into DC current according to a specific circuit topology. The DC end of the first motor rectifier component is electrically connected to the DC end of the first inverter component, realizing the conversion and transmission of electric energy between different forms. The rectified DC power is transmitted to the first inverter component, and the inverter component converts the DC power into AC power according to the set frequency and waveform by controlling the conduction and shutdown of the power switch device. This DC-AC conversion process can accurately control the parameters such as the frequency, voltage and phase of the output power, thereby simulating the AC power supply characteristics required by the motor under different working conditions. The AC end of the first inverter component is connected in parallel with the other AC end of the second motor power module and then connected to the AC end of the motor driver. The parallel connection enables the two motor power modules to work together to provide sufficient power for the motor driver. When testing the motor driver, by accurately controlling the working state of the first rectifier component and the first inverter component, the operating state of the motor under different driving conditions of the car can be simulated, such as uniform speed driving on a flat road, high torque demand when climbing a slope, and energy recovery during braking, so as to comprehensively and accurately test the performance of the motor driver under various working conditions.

[0071] Optionally, the second motor power module includes a second motor rectifier component and a second inverter component, the AC end of the second motor rectifier component is connected to the second motor winding, the DC end of the second motor rectifier component is connected to the DC end of the second inverter component, and the AC end of the second inverter component is connected in parallel with the AC end of the first inverter component for connection to the AC end of the motor driver.

[0072] In this optional embodiment, if Figure 4As shown, the second motor power module is mainly composed of a second motor rectifier component and a second inverter component. The AC end of the second motor rectifier component is connected to the second motor winding B2 in the isolation transformer. The isolation transformer can convert the voltage and electrically isolate the electric energy input from the power grid, provide a suitable voltage level for subsequent motor simulation, and ensure the safety of the system. The second motor rectifier component uses its internal diodes or thyristors and other rectifier elements to convert AC current into DC current according to a specific circuit topology. The DC end of the second motor rectifier component is electrically connected to the DC end of the second inverter component, realizing the conversion and transmission of electric energy between different forms. The rectified DC power is transmitted to the second inverter component, and the second inverter component converts the DC power into AC power according to the set frequency and waveform by controlling the conduction and shutdown of the power switch device. This DC-AC conversion process can accurately control the parameters such as the frequency, voltage and phase of the output power, thereby simulating the AC power supply characteristics required by the motor under different working conditions. The AC end of the second inverter component is connected in parallel with the other AC end of the first motor power module and then connected to the AC end of the motor driver. The parallel connection enables the two motor power modules to work together to provide sufficient power for the motor driver. When testing the motor driver, by accurately controlling the working state of the second rectifier component and the second inverter component, the operating state of the motor under different driving conditions of the car can be simulated, such as uniform speed driving on a flat road, high torque demand when climbing a slope, and energy recovery during braking, so as to comprehensively and accurately test the performance of the motor driver under various working conditions.

[0073] like Figure 5 As shown, a control method of a motor driver test device provided by an embodiment of the present invention is based on the above-mentioned motor driver test device, and the control method of the motor driver test device includes:

[0074] S100, adjusting the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test status of the motor driver.

[0075] Specifically, the test state of the motor driver set by the user is first obtained, and the working modes of the battery simulation unit and the motor simulation unit are adjusted according to the test state, so that the motor driver can be tested in different test states. By accurately adjusting the working modes of the battery and the motor simulation unit, an environment for the motor driver that meets the requirements can be quickly built, thereby effectively improving the test efficiency of the motor driver.

[0076] The control method of the motor driver testing device of this embodiment is the motor driver testing device as described above, and its advantages over the prior art are the same as the advantages of the above-mentioned motor driver testing device over the prior art, which will not be repeated here.

[0077] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0078] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A motor driver testing device, characterized in that: It includes a control unit, a sensor simulation box, a motor simulation unit, a battery simulation unit and an isolation transformer, wherein the isolation transformer includes a battery winding and a motor winding, wherein the battery winding is connected to an AC end of the battery simulation unit, and the DC end of the battery simulation unit is used to be connected to a DC end of a motor driver to be tested, wherein the motor winding is connected to an AC end of the motor simulation unit, and the other AC end of the motor simulation unit is used to be connected to an AC end of the motor driver, wherein the control unit is respectively connected to the sensor simulation box, the battery simulation unit and the motor simulation unit for communication, and wherein the sensor simulation box is used to be connected to the motor driver for communication; The control unit is used to adjust the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test status of the motor driver.

2. The motor driver testing device according to claim 1, characterized in that: The step of adjusting the working modes of the motor simulation unit and the battery simulation unit respectively according to the acquired test state of the motor driver comprises: When performing an electric state test, respectively controlling the working modes of the battery simulation unit and the motor simulation unit to be adjusted to an electric mode; When a braking state test is performed, the working modes of the battery simulation unit and the motor simulation unit are respectively controlled to be adjusted to a braking mode.

3. The motor driver testing device according to claim 1, characterized in that: The control unit is also used for: Acquiring sampling information from the motor simulation unit, wherein the sampling information includes current sampling information and voltage sampling information; Generate corresponding motor state information according to the sampling information, wherein the motor state information includes motor position information and motor speed information; The motor state information is sent to the sensor simulation box, and corresponding sensor waveform information generated by the sensor simulation box according to the motor state information is sent to the motor driver.

4. The motor driver testing device according to claim 1, characterized in that: The battery winding includes a first battery winding and a second battery winding, and the battery simulation unit includes a first battery power module and a second battery power module. The first battery winding is connected to the AC end of the first battery power module, and the second battery winding is connected to the AC end of the second battery power module. The DC end of the first battery power module and the DC end of the second battery power module are connected in series and used to connect to the DC end of the motor driver.

5. The motor driver testing device according to claim 4, characterized in that: The first battery power module includes a first battery rectifier component and a first step-down component, the AC end of the first battery rectifier component is connected to the first battery winding, the DC end of the first battery rectifier component is connected to the high-voltage end of the first step-down component, and the low-voltage end of the first step-down component serves as the DC end of the first battery power module.

6. The motor driver testing device according to claim 5, characterized in that: The second battery power module includes a second battery rectifier component and a second step-down component, the AC end of the second battery rectifier component is connected to the second battery winding, the DC end of the second battery rectifier component is connected to the high voltage end of the second step-down component, and the low voltage end of the second step-down component is connected in series with the low voltage end of the first step-down component for connection to the DC end of the motor driver.

7. The motor driver testing device according to claim 1, characterized in that: The motor winding includes a first motor winding and a second motor winding, and the motor simulation unit includes a first motor power module and a second motor power module. The AC end of the first motor power module is connected to the first motor winding, and the AC end of the second motor power module is connected to the second motor winding. The other AC end of the first motor power module and the other AC end of the second motor power module are connected in parallel and used to be connected to the AC end of the motor driver.

8. The motor driver testing device according to claim 7, characterized in that: The first motor power module includes a first motor rectifier component and a first inverter component. The AC end of the first motor rectifier component is connected to the first motor winding, the DC end of the first motor rectifier component is connected to the DC end of the first inverter component, and the AC end of the first inverter component serves as the other AC end of the first motor power module.

9. The motor driver testing device according to claim 8, characterized in that: The second motor power module includes a second motor rectifier component and a second inverter component, the AC end of the second motor rectifier component is connected to the second motor winding, the DC end of the second motor rectifier component is connected to the DC end of the second inverter component, and the AC end of the second inverter component is connected in parallel with the AC end of the first inverter component for connection to the AC end of the motor driver.

10. A control method for a motor driver test device, characterized in that: Based on the motor driver testing device according to any one of claims 1 to 9, the control method of the motor driver testing device includes: According to the acquired test status of the motor driver, the working modes of the motor simulation unit and the battery simulation unit are adjusted respectively.

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