Method, device and medium for locked-rotor test of high-voltage variable-frequency drive asynchronous motor

Abstract

The application discloses a high-voltage frequency converter driven asynchronous motor locked-rotor test method, equipment and medium, and the method comprises the following steps: the high-voltage frequency converter enables voltage frequency separation, and makes the asynchronous motor be in a standby operation state based on a desired frequency; a voltage is applied to the stator end of the asynchronous motor, and the voltage given value is gradually increased; when the actual current value reaches the desired current value, the increase rate of the voltage given value is reduced until it is determined that the rotor of the asynchronous motor starts to rotate; based on the actual current value, the locked-rotor test for the asynchronous motor is realized. Through high-voltage frequency converter voltage frequency separation control, the voltage can be applied and the current can be gradually increased in the rotor static state without mechanically locking the rotor, the locked-rotor working condition is simulated, and the potential damage risk of the output shaft and the bearing in the traditional mechanical locked-rotor mode is avoided.

Description

Technical Field

[0001] This application relates to the field of motor control, specifically to the test method, equipment, and medium for stall test of asynchronous motors driven by high-voltage frequency converters. Background Technology

[0002] Traditional asynchronous motor testing schemes typically employ a large testing system composed of numerous devices such as DC generators, DC motors, and AC generators. This not only increases the complexity of the system but also makes it difficult to guarantee the accuracy and qualitative nature of the motor test data.

[0003] With the emergence of high-performance high-voltage frequency converters, basic factory performance tests such as no-load testing, static parameter identification, and temperature rise testing of high-power asynchronous motors can be achieved. At the same time, vector control strategies can also ensure precise torque control and guarantee the reliability of motor test data.

[0004] The asynchronous motor stall test is an important type test, mainly used to evaluate the electrical performance, thermal performance and reliability of the motor when the rotor is stalled (i.e. the rotor is stationary).

[0005] Traditional testing methods connect the output shaft of the asynchronous motor to the output shaft of the dynamometer, using mechanical fixing to lock the output shaft and measure the stall torque of the asynchronous motor. For high-power, high-torque asynchronous motors, this traditional method is prone to damaging the locked output shaft during stall tests. Furthermore, the cumbersome operation procedures reduce the manufacturer's testing efficiency. Therefore, simulating stall tests through torque output with a large transient current without fixing the shaft has become a direction for algorithm optimization in high-voltage frequency converters. Summary of the Invention

[0006] To address the aforementioned problems, this application proposes a stall test method for asynchronous motors driven by high-voltage frequency converters, including: The high-voltage frequency converter enables voltage-frequency separation and puts the asynchronous motor into standby operation based on the desired frequency; A voltage is applied to the stator terminals of the asynchronous motor, and the voltage setpoint is gradually increased, while the corresponding actual current value is collected. Once the actual current value reaches the desired current value, reduce the rate of increase of the voltage setpoint until it is determined that the rotor of the asynchronous motor begins to rotate; Based on the actual current value, a stall test is performed on the asynchronous motor.

[0007] In one example, the high-voltage frequency converter enables voltage-frequency separation and puts the asynchronous motor into standby operation based on the desired frequency, specifically including: The high-voltage frequency converter enables voltage and frequency separation, allowing the voltage setpoint and frequency setpoint to operate independently. The voltage setpoint is set to 0, and the frequency setpoint is set to the desired frequency. Start the high-voltage frequency converter so that the asynchronous motor is in standby mode based on the desired frequency.

[0008] In one example, before applying voltage to the stator terminals of the asynchronous motor, the method further includes: A voltage acceleration time parameter is set to control the rate of increase of the voltage setpoint as it gradually increases, based on the voltage acceleration time parameter.

[0009] In one example, after determining that the actual current value has reached the desired current value, the rate of increase of the voltage setpoint is reduced until it is determined that the rotor of the asynchronous motor has started to rotate. Specifically, this includes: Once the actual current value reaches the desired current value, the rate of increase of the voltage setpoint is reduced, so that the actual current value is controlled at the desired current value. After decreasing the rate of increase, the voltage setpoint is continuously increased until it is determined that the rotor of the asynchronous motor begins to rotate.

[0010] In one example, a stall test for the asynchronous motor is performed based on the actual current value, specifically including: A stall test is performed on the asynchronous motor based on the actual current value collected during the time period from the start of voltage application to the start of rotor rotation.

[0011] In one example, a voltage is applied to the stator terminals of the asynchronous motor, and the voltage setpoint is gradually increased, while the corresponding actual current value is collected. Specifically, this includes: Integrate the desired frequency to obtain the synchronization angle required for the rotational coordinate transformation; The voltage setpoint and the synchronization angle are transformed into dq / abc coordinates to obtain a three-phase AC modulation wave. The three-phase AC modulation wave is subjected to carrier phase-shift PWM modulation and driven by the high-voltage frequency converter to output to the motor stator to generate output current; The output current is converted into an abc / dq coordinate system and then converted into a current feedback quantity, which is used as the actual current value.

[0012] On the other hand, this application also proposes a stall test device for an asynchronous motor driven by a high-voltage frequency converter, comprising: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform a stall test method for an asynchronous motor driven by a high-voltage frequency converter, as described in any of the above examples.

[0013] On the other hand, this application also proposes a non-volatile computer storage medium storing computer-executable instructions configured to implement a stall test method for an asynchronous motor driven by a high-voltage frequency converter as described in any of the above examples.

[0014] The stall test method for asynchronous motors driven by high-voltage frequency converters proposed in this application can bring the following benefits: By using voltage-frequency separation control via a high-voltage frequency converter, voltage can be applied and current gradually increased while the rotor is stationary without mechanically locking it, simulating a stalled rotor condition. This avoids the potential damage risks to the output shaft and bearings associated with traditional mechanical stall methods. The test process relies solely on frequency converter software parameter adjustments, eliminating the need for a dynamometer or mechanical fixing devices, reducing hardware installation and disassembly steps, and improving test efficiency. Maintaining a controllable current increase before the rotor reaches critical rotation not only obtains stall characteristic data but also prevents dynamic interference introduced by accidental rotor rotation, ensuring the consistency and safety of test data. Furthermore, this method is applicable to high-power high-voltage asynchronous motors, overcoming the problem of unreliable locking due to excessive torque in mechanical stall devices, thus enhancing the applicability and reliability of the test system. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart illustrating the stall test method for an asynchronous motor driven by a high-voltage frequency converter in this embodiment of the application. Figure 2 This is a schematic diagram of the control flow of a stall test method for an asynchronous motor driven by a high-voltage frequency converter under one scenario in an embodiment of this application. Figure 3 This is a schematic diagram of the overall control architecture under one scenario in the embodiments of this application; Figure 4 This is a schematic diagram of a stall test device for an asynchronous motor driven by a high-voltage frequency converter, as described in this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown in the embodiment of this application, a stall test method for an asynchronous motor driven by a high-voltage frequency converter is provided, including: S101: The high-voltage frequency converter enables voltage-frequency separation and puts the asynchronous motor into standby operation based on the desired frequency.

[0019] A high-voltage frequency converter is a device that converts fixed-frequency, fixed-amplitude industrial-frequency high-voltage AC power into high-voltage AC power with independently adjustable frequency and amplitude through a power electronic power unit. Typically, the output of the high-voltage frequency converter is directly connected to the stator winding of the asynchronous motor via a high-voltage cable, forming the main electrical circuit. Simultaneously, feedback signals such as current and speed from the motor side are connected to the frequency converter control unit via signal cables, forming a closed-loop control link.

[0020] like Figure 2 As shown, the high-voltage frequency converter enables voltage and frequency separation, allowing the voltage and frequency settings to operate independently. The voltage setting is set to 0, and the frequency setting is set to the desired frequency.

[0021] Voltage-frequency separation, also known as V / F separation, refers to the process where, in conventional voltage-frequency control, the output voltage and frequency of a high-voltage frequency converter are proportionally linked according to a preset curve (e.g., 50Hz corresponds to 100% of the rated voltage). Voltage-frequency separation, however, uses software algorithms to break this binding relationship, allowing the voltage and frequency channels to operate independently.

[0022] The desired frequency is a pre-set target value of the fundamental frequency of the inverter output, which in this application can be directly set to the rated frequency of the motor (e.g., 50Hz).

[0023] Start the high-voltage frequency converter to put the asynchronous motor into standby mode based on the desired frequency. Standby mode means that the frequency converter is turned on and running, the output frequency is stable at the desired frequency, but the output voltage amplitude is zero. At this time, the motor stator has only a very weak excitation current, the rotor remains stationary, and it is in a preparatory working condition of being energized but not rotating.

[0024] S102: Apply voltage to the stator terminal of the asynchronous motor, gradually increase the voltage setpoint, and collect the corresponding actual current value.

[0025] Before applying voltage, a voltage acceleration time parameter is set to control the rate of increase of the voltage setpoint as it gradually increases. The voltage acceleration time parameter refers to the set length of time it takes for the inverter output voltage to rise from 0 to its rated value. A shorter time results in a steeper slope for the voltage setpoint; a longer time results in a gentler slope. The actual voltage setpoint then increases linearly and smoothly with time according to this slope.

[0026] Specifically, such as Figure 3 As shown, integrating the desired frequency yields the synchronization angle required for the coordinate transformation. Frequency represents the change in angle per unit time. Integrating the desired frequency is equivalent to continuously accumulating the frequency over time, obtaining the accumulated angle at each moment (referred to here as the synchronization angle). This synchronization angle serves as the rotation phase input for the coordinate transformation, establishing a definite spatiotemporal correspondence between the stationary coordinate system and the synchronously rotating coordinate system.

[0027] The voltage setpoint and synchronization angle are transformed into dq / abc coordinates to obtain the three-phase AC modulated wave. The dq / abc coordinate transformation is also called the synchronous rotating coordinate system / stationary three-phase coordinate system coordinate transformation. During execution, the voltage setpoint and synchronization angle need to be input. The voltage setpoint includes two orthogonal DC components in the synchronous rotating coordinate system (dq coordinate system): the direct-axis component... With cross axis components These correspond to the excitation voltage command and the torque voltage command, respectively; the synchronization angle θ is the instantaneous electrical angle generated by the integrator from the desired frequency, representing the spatial phase difference between the synchronous rotating coordinate system and the A-axis of the stationary three-phase coordinate system.

[0028] During the dq / abc coordinate transformation, an inverse Park transform is first performed, using the synchronization angle θ as the rotation angle to rotate the dq-axis voltage vector, mapping it to a two-phase stationary coordinate system (α-β coordinate system). This step converts the DC quantity in the rotating coordinate system into an orthogonal AC quantity in the stationary coordinate system, whose amplitude envelope is equal to the magnitude of the dq composite vector, and whose phase is determined by θ. Then, an inverse Clarke transform is performed to linearly distribute the α-β-axis voltage components in the three-phase stationary coordinate system, generating three-phase sinusoidal reference signals with a 120° electrical angle difference. , , .

[0029] The three-phase AC modulation wave is subjected to carrier phase-shift PWM modulation and driven by the high-voltage frequency converter to output to the motor stator, generating output current. PWM stands for Pulse Width Modulation, and its input signal is a three-phase sinusoidal reference signal (three-phase AC modulation wave). , , ,by Figure 3 For example, the components are fed into a three-phase, five-unit cascaded H-bridge (CHB) high-voltage frequency converter, consisting of A, B, and C. Each phase is composed of five independent H-bridge inverter power units (A1~A5, B1~B5, and C1~C5, respectively). Carrier phase shifting refers to a fixed phase shift of the triangular carrier corresponding to each power unit, with the carriers of each unit being uniformly staggered in timing.

[0030] During modulation, the three-phase modulation wave is compared with the phase-shifted carrier wave corresponding to each unit. When the instantaneous value of the modulation wave is greater than the carrier value, the corresponding switch is turned on, and vice versa, generating a series of pulse sequences whose pulse width changes according to a sinusoidal law.

[0031] The generated PWM switching signal is transmitted to the gate of each power unit's IGBT via optical fiber or drive circuit, controlling the power unit to chop the DC bus voltage in pulse form. After the outputs of each power unit are cascaded and superimposed, a high-voltage multi-level PWM voltage waveform is formed at the inverter output terminal, and its fundamental component is a sinusoidal AC voltage with the same frequency and phase as the modulation wave.

[0032] Output current (also known as motor stator current, including...) , , During the generation process, a three-phase high-voltage PWM voltage is applied to the stator winding of the motor, with the neutral point N of the winding as a common reference. Under the action of stator leakage inductance and air gap magnetic circuit, the high-frequency carrier component is filtered out, and a fundamental sinusoidal current flows through the winding. Its amplitude is determined by the fundamental voltage and the equivalent impedance of the motor, and its frequency is strictly synchronized with the modulation wave frequency.

[0033] The output current is transformed into an abc / dq coordinate system to become the current feedback value. This abc / dq coordinate transformation, also known as the stationary three-phase coordinate system / synchronous rotating coordinate system transformation, is the reverse of the dq / abc coordinate transformation. First, a Clarke transformation is performed to synthesize the three-phase current into two orthogonal AC components (α-β axis). Then, a Park transformation is performed, using the synchronous angle θ to rotate the α-β component to the dq coordinate system, which rotates synchronously with the magnetic field, thus obtaining the direct-axis component. (Reactive excitation current) and quadrature axis component (Active torque current), which serves as a current feedback quantity. , All are DC quantities, and their vector and amplitude values ​​can be used as the actual current values ​​in this application.

[0034] S103: Determine that the actual current value has reached the desired current value, and reduce the rate of increase of the voltage setpoint until it is determined that the rotor of the asynchronous motor has started to rotate.

[0035] Determine if the actual current value reaches the desired current value (the preset current limit). To reduce the rate of increase of the voltage setpoint, the actual current value is controlled at the desired current value. Let the voltage rise slope before reducing the rate of increase be... The slope of the voltage rise after reducing the rate of increase is When the detected actual current value reaches the preset desired current value, the frequency converter automatically reduces the rate of increase of the voltage setpoint, causing it to... Become The voltage is increased slowly only to offset the natural decay of the current, thereby stabilizing and clamping the output current near the desired current value, achieving stall data acquisition under constant current control.

[0036] After decreasing the rate of increase, the voltage setpoint was continuously increased until the rotor of the asynchronous motor began to rotate. Even after reducing the voltage rise rate, the voltage setpoint continued to climb at a relatively gentle slope, gradually increasing the stator voltage. When the electromagnetic torque accumulated to a critical point sufficient to overcome the rotor's static friction resistance, the rotor began to rotate, marking the end of the stall test data acquisition.

[0037] As the rotor begins to rotate, its speed increases and eventually reaches the preset desired frequency.

[0038] S104: Based on the actual current value, perform a stall test on the asynchronous motor.

[0039] Specifically, a locked-rotor test is performed on the asynchronous motor based on the actual current value collected during the time period from the initial voltage application to the rotor's initial rotation. Alternatively, a corresponding voltage setpoint can be collected as an indicator of the locked-rotor current under different voltage values. During this period, the motor rotor is stationary, corresponding to a pure locked-rotor state with a slip of s=1, and the current-voltage relationship meets the definition conditions of the locked-rotor test. Once the rotor rotates, a back electromotive force is established, and the data deviates from the locked-rotor characteristics; therefore, only data from this time period is used. After obtaining the voltage setpoint and actual current value, a locked-rotor characteristic curve can be plotted, and parameters such as short-circuit impedance and rotor resistance can be calculated to evaluate the motor's starting performance and verify the equivalent circuit model. Of course, based on requirements, the test can be continued after the asynchronous motor rotor begins to rotate, with corresponding data collection and analysis to address other additional needs.

[0040] By using voltage-frequency separation control via a high-voltage frequency converter, voltage can be applied and current gradually increased while the rotor is stationary without mechanically locking it, simulating a stalled rotor condition. This avoids the potential damage risks to the output shaft and bearings associated with traditional mechanical stall methods. The test process relies solely on frequency converter software parameter adjustments, eliminating the need for a dynamometer or mechanical fixing devices, reducing hardware installation and disassembly steps, and improving test efficiency. Maintaining a controllable current increase before the rotor reaches critical rotation not only obtains stall characteristic data but also prevents dynamic interference introduced by accidental rotor rotation, ensuring the consistency and safety of test data. Furthermore, this method is applicable to high-power high-voltage asynchronous motors, overcoming the problem of unreliable locking due to excessive torque in mechanical stall devices, thus enhancing the applicability and reliability of the test system.

[0041] like Figure 4 As shown in the illustration, this application also provides a stall test device for an asynchronous motor driven by a high-voltage frequency converter, comprising: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed, enable the at least one processor to perform the stall test method for an asynchronous motor driven by a high-voltage frequency converter as described in any of the above embodiments.

[0042] This application also provides a non-volatile computer storage medium storing computer-executable instructions, which are configured to implement the stall test method for an asynchronous motor driven by a high-voltage frequency converter as described in any embodiment.

[0043] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device and medium embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the description of the method embodiments.

[0044] The devices and media provided in this application are one-to-one with the methods. Therefore, the devices and media also have similar beneficial technical effects as their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0045] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0046] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0047] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0048] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0049] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0050] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0051] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for testing the stall state of an asynchronous motor driven by a high-voltage frequency converter, characterized in that, include: The high-voltage frequency converter enables voltage-frequency separation and puts the asynchronous motor into standby operation based on the desired frequency; A voltage is applied to the stator terminals of the asynchronous motor, and the voltage setpoint is gradually increased, while the corresponding actual current value is collected. Once the actual current value reaches the desired current value, reduce the rate of increase of the voltage setpoint until it is determined that the rotor of the asynchronous motor begins to rotate; Based on the actual current value, a stall test is performed on the asynchronous motor.

2. The stall test method for an asynchronous motor driven by a high-voltage frequency converter according to claim 1, characterized in that, The high-voltage frequency converter enables voltage-frequency separation and puts the asynchronous motor into standby operation based on the desired frequency, specifically including: The high-voltage frequency converter enables voltage and frequency separation, allowing the voltage setpoint and frequency setpoint to operate independently. The voltage setpoint is set to 0, and the frequency setpoint is set to the desired frequency. Start the high-voltage frequency converter so that the asynchronous motor is in standby mode based on the desired frequency.

3. The stall test method for an asynchronous motor driven by a high-voltage frequency converter according to claim 1, characterized in that, Before applying voltage to the stator terminals of the asynchronous motor, the method further includes: A voltage acceleration time parameter is set to control the rate of increase of the voltage setpoint as it gradually increases, based on the voltage acceleration time parameter.

4. The stall test method for an asynchronous motor driven by a high-voltage frequency converter according to claim 1, characterized in that, Once the actual current value reaches the desired current value, the rate of increase of the voltage setpoint is reduced until the rotor of the asynchronous motor begins to rotate. Specifically, this includes: Once the actual current value reaches the desired current value, the rate of increase of the voltage setpoint is reduced, so that the actual current value is controlled at the desired current value. After decreasing the rate of increase, the voltage setpoint is continuously increased until it is determined that the rotor of the asynchronous motor begins to rotate.

5. The stall test method for an asynchronous motor driven by a high-voltage frequency converter according to claim 1, characterized in that, Based on the actual current value, a stall test is performed on the asynchronous motor, specifically including: A stall test is performed on the asynchronous motor based on the actual current value collected during the time period from the start of voltage application to the start of rotor rotation.

6. The stall test method for an asynchronous motor driven by a high-voltage frequency converter according to claim 2, characterized in that, Applying voltage to the stator terminals of the asynchronous motor and gradually increasing the voltage setpoint, while simultaneously acquiring the corresponding actual current value, specifically includes: Integrate the desired frequency to obtain the synchronization angle required for the rotational coordinate transformation; The voltage setpoint and the synchronization angle are transformed into dq / abc coordinates to obtain a three-phase AC modulation wave. The three-phase AC modulation wave is subjected to carrier phase-shift PWM modulation and driven by the high-voltage frequency converter to output to the motor stator to generate output current; The output current is converted into an abc / dq coordinate system and then converted into a current feedback quantity, which is used as the actual current value.

7. A stall test device for an asynchronous motor driven by a high-voltage frequency converter, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the stall test method for an asynchronous motor driven by a high-voltage frequency converter as described in any one of claims 1 to 6.

8. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are configured to implement the stall test method for an asynchronous motor driven by a high-voltage frequency converter as described in any one of claims 1 to 6.

Images