Performance test method for high-power-density servo driver

Abstract

The invention relates to the technical field of electronic equipment characteristic parameter testing, in particular to a high-power-density servo driver performance testing method, which comprises the following steps of: constructing a servo driver testing device, and establishing electric connection between the servo driver testing device and a servo driver to be tested; the servo driver testing device comprises a load unit and a power supply unit. The power supply unit is used for supplying power in the testing process; screening a power tube which is most influenced by stray inductance in the power topology unit as a target power tube; taking the target power tube as a test object, and testing the maximum working current of the to-be-tested servo driver through the double-pulse signal; taking the target power tube as a test object, and testing the maximum working voltage of the to-be-tested servo driver through the monopulse signal; and generating a test result according to the maximum working current and the maximum working voltage. By adopting the scheme, the test cost of the performance index of the servo driver can be reduced, and the accuracy of the test result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic equipment characteristic parameter testing, and in particular to a high power density servo driver performance testing method. Background Art

[0002] With the rapid development of industrial automation and intelligent manufacturing technology, the performance of servo drives, as core power control components, directly affects the efficiency, accuracy and reliability of the entire system. In recent years, the market demand for servo drives has gradually shifted from traditional low-power applications to high power, high density and high efficiency. Especially in the fields of new energy, electric vehicles, aerospace, high-end equipment manufacturing, etc., the demand for high power density servo drives is becoming increasingly urgent. However, the design and testing of high power density servo drives face many challenges, among which the accurate evaluation of power indicators and the optimization of test methods have become key issues that need to be solved urgently. At present, the power indicators (such as voltage, current, etc.) of servo drives are mainly determined in two ways: design assurance and motor load testing. The design assurance method relies on theoretical calculations and simulation analysis. Although the power parameters can be quickly determined during the design phase, the difference between the actual operating environment and the theoretical model often leads to a large deviation between the actual performance of the drive and the design indicators. This deviation may manifest as a power indicator that is too high or too low, which not only affects the performance optimization of the drive, but may also cause it to fail to meet the requirements in specific application scenarios, and even cause system failures. Therefore, the design assurance method is difficult to fully and accurately reflect the true performance of the servo drive.

[0003] Another commonly used method is motor load testing, which is to test the servo drive through the actual motor load to obtain its power index. Although this method can reflect the actual performance of the drive to a certain extent, its limitations are also very obvious. First, the test data depends on a specific type or model of motor, which limits the scope of application of the test results and makes it difficult to extend to other types of drives or motor combinations. Secondly, the motor load test process is complicated and requires the construction of a special test platform, which is inefficient and costly. Especially in the test of high-power servo drives with high voltage and high current, the implementation of motor load testing is more difficult, and the cost and safety requirements of the test equipment are also significantly increased. In addition, the motor load test is highly dependent on the test environment, and environmental factors (such as temperature, humidity, electromagnetic interference, etc.) may have a greater impact on the test results, further reducing the reliability and versatility of the test data.

[0004] In view of the above problems, there is an urgent need to provide a high power density servo drive performance testing method that can reduce the testing cost of servo drive performance indicators and improve the accuracy of test results. Summary of the invention

[0005] The present invention provides a high power density servo drive performance testing method, which can reduce the testing cost of the servo drive performance index and improve the accuracy of the test result.

[0006] In order to achieve the above objectives, this application provides the following technical solutions: A high power density servo drive performance test method is used to test the performance index of a servo drive to be tested, wherein the servo drive to be tested includes a main control unit, a drive unit and a power topology unit, and includes the following steps: Constructing a servo drive test device and establishing an electrical connection between the servo drive test device and the servo drive to be tested; the servo drive test device includes a load unit and a power supply unit; the power supply unit is used for power supply during the test; The power tube most affected by stray inductance in the screening power topology unit is selected as the target power tube; Taking the target power tube as the test object, the maximum working current of the servo drive to be tested is tested through a double pulse signal; Taking the target power tube as the test object, the maximum operating voltage of the servo drive to be tested is tested through a single pulse signal; Generate test results based on maximum operating current and maximum operating voltage; The power tubes most affected by stray inductance in the screening power topology unit are the target power tubes, including: The main control unit sends a test pulse signal to each power topology unit to control the opening and closing of each power tube in the power topology unit respectively; Measure the Vdsc voltage value when each power tube is turned off; The power tube with the largest Vdsc voltage value is selected as the target power tube.

[0007] Further, the load unit includes a load inductor Lload1, a load inductor Lload2, a single switch K1, a single switch K3 and three switches K2; The single switch K1, the load inductor Lload1, the load inductor Lload2 and the single switch K3 are connected in series in sequence; the other ends of the single switch K1 and the single switch K3 are connected to the servo driver to be tested; one end of the three switches K2 is connected to the connection intersection of the load inductor Lload1 and the load inductor Lload2, and the other end is connected to the output of the servo driver to be tested.

[0008] Furthermore, when the main control unit sends a test pulse signal to each power topology unit, the current pulse width of the test pulse signal is half of the rated current of the corresponding power tube, and the voltage provided by the power supply unit is half of the rated voltage of the corresponding power tube.

[0009] Furthermore, the target power tube is used as the test object, and the maximum operating current of the servo drive to be tested is tested by a double pulse signal, including: S301, the main control unit generates a first pulse signal and a second pulse signal in sequence, and sends them to the power topology unit after power amplification by the driving unit to control the on / off of the target power tube in the power topology unit; S302, measuring the Idsc current value of the target power tube when the second pulse signal is turned on; S303, analyzing whether the measured Idsc current value is equal to the rated current of the target power tube, if so, executing S304, if not, adjusting the pulse rise time of the first pulse signal, and returning to execute S301; S304, measuring the Ids current of the target power tube, and using the measured Ids current as the maximum operating current of the servo driver to be tested.

[0010] Furthermore, the target power tube is used as the test object, and the maximum operating voltage of the servo driver to be tested is tested by a single pulse signal, including: S401, the main control unit generates a third pulse signal, which is sent to the power topology unit after power amplification by the driving unit to control the on / off of the target power tube in the power topology unit; S402, measuring the Vdsc voltage value when the target power tube is turned off; S403, analyzing whether the measured Vdsc voltage value is equal to the rated voltage of the target power tube, if so, executing S404, if not, adjusting the voltage provided by the power supply unit, and returning to execute S401; S404, measuring the Vds voltage of the target power tube, and using the measured Vds voltage as the maximum operating voltage of the servo driver to be tested.

[0011] Furthermore, the power supply unit adopts a DC power supply; the positive terminal of the DC power supply is connected to the single switch K1, and the negative terminal is connected to the single switch K3.

[0012] The principles and advantages of the present invention are: 1. Simple operation and low testing cost: In this solution, by constructing a test device including a load unit and a power unit, the maximum working current and voltage of the servo drive are tested using double pulse and single pulse signals respectively. The operation process is simple and reduces complex manual intervention. In addition, compared with the traditional motor load testing method, the test device used in the present invention has a simple structure, does not require complex testing equipment or high-cost load simulation devices, and significantly reduces the testing cost.

[0013] 2. Reliable data: By selecting the power tube most affected by stray inductance in the power topology unit as the target power tube and performing double pulse and single pulse tests on it, the maximum operating current and maximum operating voltage of the servo drive can be accurately measured. During the test, the rise time of the pulse signal and the power supply voltage are adjusted to ensure that the measured value is consistent with the preset rated value, thereby ensuring the accuracy and reliability of the test data. Compared with the traditional design assurance method, this solution avoids the deviation between the design indicators and the actual data, ensuring the authenticity and reliability of the drive indicators.

[0014] 3. High versatility: This method is applicable to various types of servo drives and has high versatility. By analyzing the stray inductance value or Vdsc voltage value of each power tube in the power topology unit, the power tube most affected by the stray inductance is selected as the test object, which can be applied to servo drives with different power topologies. In addition, the load unit and power supply unit in the test device can be adjusted according to the needs of different servo drives, further enhancing the applicability of this solution.

[0015] 4. Wide applicability: Compared with the traditional motor load test method, the test indicators obtained by the present invention have wider applicability. The motor load test method usually depends on the specific motor load, and the test results are greatly affected by the motor characteristics. However, the present invention simulates the load through the load unit, and the test results are not limited by the specific motor characteristics, which is applicable to a wider range of servo drive application scenarios.

[0016] In summary, this solution has the advantages of simple operation, low testing cost, reliable data, and high versatility, and can effectively improve the efficiency and accuracy of servo drive performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flowchart of a high power density servo drive performance testing method embodiment of the present invention.

[0018] Figure 2 This is a circuit schematic diagram of a test system in an embodiment of a high power density servo drive performance test method of the present invention. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods: The symbols in the drawings of the specification include: a main control unit 1 , a drive unit 2 , a power topology unit 3 , a servo drive to be tested 4 , a load unit 5 , a servo drive test device 6 , and a power supply unit 7 .

[0020] Embodiment 1: Embodiment 1 is basically as attached Figure 1 As shown: In this embodiment, the IDS current represents the on-current of the power tube, which directly reflects the actual load current of the power device; the IDSC current value represents the surge current, that is, the maximum current value of the target power tube when the pulse current is turned on; the VDS voltage represents the voltage stress borne by the power tube, that is, the voltage difference between the drain and source of the power tube; the VDSC voltage value represents the dynamic suppression voltage, that is, the maximum voltage value when the target power tube is turned off.

[0021] A high power density servo drive performance test method is used to test the performance indicators of the servo drive 4 to be tested, such as Figure 1 As shown, the following steps are included: S100, constructing a servo drive test device 6, and establishing an electrical connection between the servo drive test device 6 and the servo drive 4 to be tested; Figure 2 As shown, the servo driver 4 to be tested includes a main control unit 1 , a drive unit 2 and a power topology unit 3 , and the servo driver testing device 6 includes a load unit 5 and a power supply unit 7 .

[0022] Specifically, the load unit 5 includes a load inductor Lload1, a load inductor Lload2, a single switch K1, a single switch K3 and three switches K2. The current bearing capacity of the load inductor matches the index of the servo driver 4 to be tested to prevent damage during the test. The single switch K1, the load inductor Lload1, the load inductor Lload2 and the single switch K3 are connected in series in sequence; the other ends of the single switch K1 and the single switch K3 are connected to the servo driver 4 to be tested; one end of the three switches K2 is connected to the connection intersection of the load inductor Lload1 and the load inductor Lload2, and the other end is connected to the output of the servo driver 4 to be tested (connected to the U phase, V phase or W phase in the power topology unit 3 of the servo driver 4 to be tested according to actual test requirements). The single switch K1 and the single switch K3 are used when testing the power half-bridge. When testing the upper tube, the single switch K1 is closed, and when testing the lower tube, the single switch K3 is closed, and the other states are all open. The power supply unit 7 uses a DC power supply; the positive terminal of the DC power supply is connected to the single switch K1, and the negative terminal is connected to the single switch K3, which is used for power supply during the test process to ensure the normal test operation of the servo driver 4 to be tested.

[0023] also, Figure 2 The figure also includes some stray inductances, which are generated by the system wiring and cannot be eliminated. They are not actually set components. They are only shown in the figure to make the circuit clearer and facilitate the subsequent calculation of the loop stray inductance of each power tube. In actual applications, stray inductance cannot be eliminated, but it is controlled to the minimum value as much as possible.

[0024] After completing the electrical connection between the servo driver testing device 6 and the servo driver to be tested 4, it is detected whether they can operate normally, and the electrical connection between the two is checked to ensure that they are reliably connected.

[0025] S200, screening the power tube in the power topology unit 3 that is most affected by the stray inductance as the target power tube. In this solution, an analysis method or a test method can be selected according to actual needs to confirm the target power tube, specifically: The analysis method is: analyzing the stray inductance value of each power tube in the power topology unit 3; and selecting the power tube with the largest stray inductance value as the target power tube.

[0026] The test method is as follows: the main control unit 1 sends a test pulse signal to each power topology unit 3 to control the opening and closing of each power tube in the power topology unit 3 respectively; the Vdsc voltage value of each power tube when it is closed is measured, and the maximum Vdsc voltage value indicates that the stray inductance of the power tube is the largest; the power tube with the largest Vdsc voltage value is selected as the target power tube. In this embodiment, when the main control unit 1 sends a test pulse signal to each power topology unit 3, the current pulse width of the test pulse signal is half of the rated current of the corresponding power tube, and the voltage provided by the power supply unit 7 is half of the rated voltage of the corresponding power tube.

[0027] S300, taking the target power tube as the test object, testing the maximum working current of the servo driver 4 to be tested by a double pulse signal; in this embodiment, the power voltage provided by the power supply unit 7 is half of the rated voltage of the target power tube, and the starting value of the power current provided is half of the rated current of the target power tube. S300 includes: S301, the main control unit 1 generates a first pulse signal and a second pulse signal in sequence, which are sent to the power topology unit 3 after power amplification by the driving unit 2 to control the opening and closing of the target power tube in the power topology unit 3; wherein the purpose of the first pulse signal is to establish a current load, and the purpose of the second pulse signal is to turn on the driver under load.

[0028] In this embodiment, considering that the stray inductance will affect the voltage drop when the current changes, and thus affect the rate of change of the current, therefore, in combination with the stray inductance value of the target power tube, the voltage actually applied to the target power tube is for:

[0029] The optimal pulse rise time is calculated according to the stray inductance value of the target power tube, the rated current of the target power tube and the rated voltage of the target power tube.

[0030] According to the above formula, we can get:

[0031] In the formula, is the rated voltage of the target power tube, is the voltage drop across the stray inductance, is the stray inductance value of the target power tube, is the rated current of the target power tube, is the optimal pulse rise time, is the rate of change of current, Is a proportionality coefficient less than 1, indicating the ratio of the actual voltage to the power supply voltage (taking into account the influence of stray inductance). The actual operation process is summarized and determined through experiments or simulations. In this embodiment, .

[0032] Therefore, in the present application, according to the calculated optimal pulse rise time, the main control unit 1 is controlled to generate a first pulse signal to more accurately control the current to reach the rated current of the target power tube.

[0033] S302, measuring the Idsc current value of the target power tube when the second pulse signal is turned on.

[0034] S303, analyzing whether the measured Idsc current value is equal to the rated current of the target power tube, if so, executing S304, if not, adjusting the pulse rise time of the first pulse signal, and returning to execute S301.

[0035] S304, measuring the Ids current of the target power tube, and using the measured Ids current as the maximum operating current of the servo driver 4 to be tested.

[0036] S400, taking the target power tube as the test object, testing the maximum working voltage of the servo driver 4 to be tested by a single pulse signal; in this embodiment, the starting value of the power voltage provided by the power supply unit 7 is half of the rated voltage of the target power tube, and the signal opening width during the test meets the maximum working current of the servo driver 4 to be tested obtained in S300. S400 includes: S401, the main control unit 1 generates a third pulse signal, which is sent to the power topology unit 3 after power amplification by the driving unit 2 to control the on / off of the target power tube in the power topology unit 3. The purpose of the third pulse signal is to establish a current load.

[0037] S402, measuring the Vdsc voltage value when the target power tube is turned off.

[0038] S403, analyzing whether the measured Vdsc voltage value is equal to the rated voltage of the target power tube, if so, executing S404, if not, adjusting the voltage provided by the power supply unit 7, and returning to execute S401.

[0039] S404, measuring the Vds voltage of the target power tube, and using the measured Vds voltage as the maximum operating voltage of the servo driver 4 to be tested.

[0040] S500, generating a test result according to the maximum operating current and the maximum operating voltage.

[0041] The above are only embodiments of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A high power density servo drive performance test method, used to test the performance indicators of a servo drive to be tested, wherein the servo drive to be tested includes a main control unit, a drive unit and a power topology unit, and is characterized in that: The following steps are involved: Constructing a servo drive test device and establishing an electrical connection between the servo drive test device and the servo drive to be tested; the servo drive test device includes a load unit and a power supply unit; the power supply unit is used for power supply during the test; The power tube most affected by stray inductance in the screening power topology unit is selected as the target power tube; Taking the target power tube as the test object, the maximum working current of the servo drive to be tested is tested through a double pulse signal; Taking the target power tube as the test object, the maximum operating voltage of the servo drive to be tested is tested through a single pulse signal; Generate test results based on maximum operating current and maximum operating voltage; The power tubes most affected by stray inductance in the screening power topology unit are the target power tubes, including: The main control unit sends a test pulse signal to each power topology unit to control the opening and closing of each power tube in the power topology unit respectively; Measure the Vdsc voltage value when each power tube is turned off; The power tube with the largest Vdsc voltage value is selected as the target power tube.

2. The high power density servo drive performance testing method according to claim 1, characterized in that: The load unit includes a load inductor Lload1, a load inductor Lload2, a single switch K1, a single switch K3 and three switches K2; The single switch K1, the load inductor Lload1, the load inductor Lload2 and the single switch K3 are connected in series in sequence; the other ends of the single switch K1 and the single switch K3 are connected to the servo driver to be tested; one end of the three switches K2 is connected to the connection intersection of the load inductor Lload1 and the load inductor Lload2, and the other end is connected to the output of the servo driver to be tested.

3. The high power density servo drive performance testing method according to claim 1, characterized in that: When the main control unit sends a test pulse signal to each power topology unit, the current pulse width of the test pulse signal is half of the rated current of the corresponding power tube, and the voltage provided by the power supply unit is half of the rated voltage of the corresponding power tube.

4. The high power density servo drive performance testing method according to claim 1, characterized in that: Taking the target power tube as the test object, the maximum operating current of the servo drive to be tested is tested through a double pulse signal, including: S301, the main control unit generates a first pulse signal and a second pulse signal in sequence, and sends them to the power topology unit after power amplification by the driving unit to control the on / off of the target power tube in the power topology unit; S302, measuring the Idsc current value of the target power tube when the second pulse signal is turned on; S303, analyzing whether the measured Idsc current value is equal to the rated current of the target power tube, if so, executing S304, if not, adjusting the pulse rise time of the first pulse signal, and returning to execute S301; S304, measuring the Ids current of the target power tube, and using the measured Ids current as the maximum operating current of the servo driver to be tested.

5. The high power density servo drive performance testing method according to claim 1, characterized in that: Taking the target power tube as the test object, the maximum operating voltage of the servo drive to be tested is tested through a single pulse signal, including: S401, the main control unit generates a third pulse signal, which is sent to the power topology unit after power amplification by the driving unit to control the on / off of the target power tube in the power topology unit; S402, measuring the Vdsc voltage value when the target power tube is turned off; S403, analyzing whether the measured Vdsc voltage value is equal to the rated voltage of the target power tube, if so, executing S404, if not, adjusting the voltage provided by the power supply unit, and returning to execute S401; S404, measuring the Vds voltage of the target power tube, and using the measured Vds voltage as the maximum operating voltage of the servo driver to be tested.

6. The high power density servo drive performance testing method according to claim 2, characterized in that: The power supply unit adopts a DC power supply; the positive terminal of the DC power supply is connected to the single switch K1, and the negative terminal is connected to the single switch K3.

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