Simulation system and device for motor twin trawling test

Abstract

The invention relates to a simulation system and device for a motor twin trawling test. The simulation system comprises an inductance adjusting circuit, a motor control circuit and a motor simulation circuit. The inductance adjusting circuit comprises a current acquisition module and a coupling inductor group, the coupling inductor group is respectively connected with the current acquisition module, the motor control circuit and the motor analog circuit, and the motor control circuit is used for outputting initial current; the motor simulation circuit is used for generating a first pulse width modulation signal according to the initial current collected by the current collection module, and outputting a first current according to the first pulse width modulation signal. Under the condition that the simulation system operates stably, the inductance parameter of the coupling inductor group is adjusted, so that the current parameter of the second current acquired by the current acquisition module is the same as that of the preset current, and the first inductance parameter of the coupling inductor group is acquired; the first inductance parameter is the inductance parameter of the coupling inductor group under the condition that the simulation system meets the performance requirement, so that accurate model selection of the coupling inductor in the motor twin trawling test can be realized.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of motor test, in particular to a simulation system and device for motor drag test. BACKGROUND

[0002] The motor drag test is a test method in which a motor controller and a motor simulator are connected to form a closed-loop system, and is mainly used to test various performance indicators of the motor controller or the motor simulator. The motor simulator needs to accurately simulate its performance under the conditions of the highest frequency of current and the minimum peak value of current, and the highest frequency of current and the minimum peak value of current of the motor simulator are usually determined through the drag test with the motor controller.

[0003] In the drag test, if the coupling inductance connected with the motor simulator is not suitable, it may cause the attenuation of the current peak value or the increase of the no-load current, thereby affecting the accurate evaluation of the control performance of the motor controller under the conditions of the highest speed or no load, and further affecting the test results of the drag test. Therefore, how to accurately select the coupling inductance in the drag test to ensure that the motor simulator can accurately simulate the performance under the conditions of the highest frequency of current and the minimum peak value of current has become a technical problem that technicians in the field need to solve. SUMMARY

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a simulation system and device for motor drag test, which can accurately select the coupling inductance in the drag test of the motor.

[0005] In one aspect, the present disclosure provides a simulation system for motor drag test, comprising: an inductance adjusting circuit, a motor control circuit and a motor simulation circuit.

[0006] The inductance adjusting circuit comprises a current collecting module and a coupling inductance group, the current collecting module is connected with the coupling inductance group, and the current collecting module is used to collect the current flowing through the coupling inductance group; The motor control circuit is connected with the coupling inductance group, and the motor control circuit is used to output the starting current; The motor simulation circuit is connected with the coupling inductance group, and the motor simulation circuit is used to generate a first pulse width modulation signal according to the starting current of the motor control circuit collected by the current collecting module, and output a first current according to the first pulse width modulation signal; wherein the first current of the motor simulation circuit is the working current under the stable operation of the simulation system; Under the condition that the simulation system is stable, the inductance parameters of the coupling inductance group are adjusted so that the second current collected by the current collection module is the same as the current parameters of the preset current, and the first inductance parameters of the coupling inductance group are obtained; wherein the preset current is the working current under the condition that the simulation system meets the performance requirements; and the first inductance parameters are the inductance parameters of the coupling inductance group under the condition that the simulation system meets the performance requirements.

[0007] Optionally, the motor simulation circuit is configured to perform closed-loop adjustment on the output pulse width modulation signal according to the starting current collected by the current collection module, and generate the first pulse width modulation signal under the condition that the third current is collected by the current collection module. wherein the third current is the working current generated after the motor simulation circuit is closed-loop adjusted for multiple times.

[0008] Optionally, the motor simulation circuit comprises: a first signal generation module connected with the current collection module, the first signal generation module being configured to generate a pulse width modulation signal according to the current collected by the current collection module; a first inverter connected with the first signal generation module, the first inverter being configured to output a working current according to the first bus voltage under the condition that the pulse width modulation signal generated by the first signal generation module is received; wherein the first bus voltage is the power supply voltage of the first inverter.

[0009] Optionally, the first signal generation module comprises a reference current providing unit and at least one first signal generation unit; the reference current providing unit is configured to provide a sinusoidal current signal; the first signal generation unit comprises a first threshold generation circuit, a signal generation circuit and a first inverter; the pulse width modulation signal generated by the first signal generation module comprises a first pulse width modulation sub-signal and a second pulse width modulation sub-signal, and the working current output by the first inverter comprises at least one sub-working current; the first input end of the first threshold generation circuit is connected with the reference current providing unit, the second input end of the first threshold generation circuit is connected with the current collection module, the output end of the first threshold generation circuit is connected with the input end of the signal generation circuit, the output end of the signal generation circuit is connected with the first output end of the first signal generation unit, and the output end of the signal generation circuit is further connected with the second output end of the first signal generation unit through the first inverter; the first threshold generation circuit is configured to calculate and generate a first threshold according to the current collected by the current collection module and the sinusoidal current signal; and the signal generation circuit is configured to output the first pulse width modulation sub-signal according to the first threshold; The first output end of the first signal generation unit is configured to output the first pulse width modulation sub-signal, and the second output end of the first signal generation unit is configured to output the second pulse width modulation sub-signal; the first inverter is configured to output a sub-working current according to the first bus voltage in the case of receiving the first pulse width modulation sub-signal and the second pulse width modulation sub-signal. The phase difference between the first pulse width modulation sub-signal and the second pulse width modulation sub-signal is 180°.

[0010] Optionally, the first threshold generation circuit comprises: a difference calculation circuit, a first input end of the difference calculation circuit being connected with the reference current providing unit, and a second input end of the difference calculation circuit being connected with the current acquisition module; the difference calculation circuit is configured to calculate a current difference value between the current value of the sinusoidal current signal and the current value of the current acquired by the current acquisition module at each time point; a current controller, the output end of the difference calculation circuit being connected with the current controller, and the current controller being configured to output a threshold parameter based on the value of the input current difference value; a threshold generation sub-circuit, comprising a divider and a limiter; a first input end of the divider being connected with the output end of the current controller, a second input end of the divider inputting a reference value, and the divider being configured to output a quotient value between the threshold parameter and the reference value; the output end of the divider being connected with the limiter, the input end of the signal generation circuit being connected with the limiter, and the limiter being configured to limit the quotient value between the threshold parameter and the reference value output by the divider within a first value range; The quotient value between each threshold parameter and the reference value limited within the first value range is a first threshold.

[0011] Optionally, the signal generation circuit comprises a first triangular wave providing unit and a first comparison circuit; the first triangular wave providing unit is configured to provide a first triangular wave signal; a first input end of the first comparison circuit being connected with the first triangular wave providing unit, a second input end of the first comparison circuit being connected with the first threshold generation circuit, the output end of the first comparison circuit being connected with the first output end of the first signal generation unit, and the output end of the first comparison circuit being further connected with the second output end of the first signal generation unit through a first inverter; The first comparison circuit is configured to output the first pulse width modulation sub-signal according to a comparison result of the amplitude voltage of the first triangular wave signal and the first threshold. Optionally, the motor control circuit comprises: a second signal generation module, configured to generate a second pulse width modulation signal; a second inverter, connected with the second signal generation module, and configured to output a starting current according to a second bus voltage in the case of receiving the second pulse width modulation signal; The second bus voltage is a power supply voltage of the second inverter.

[0012] Optionally, the second signal generation module comprises a second triangular wave providing unit and at least one second signal generation unit; the second triangular wave providing unit is configured to provide a second triangular wave signal; The second signal generation unit comprises a second threshold generation circuit, a second comparison circuit and a second inverter; the second pulse width modulation signal comprises a third pulse width modulation sub-signal and a fourth pulse width modulation sub-signal, and the starting current comprises at least one sub-starting current; The first input end of the second comparison circuit is connected with the second triangular wave providing unit, the second threshold generation circuit is connected with the second input end of the second comparison circuit, the output end of the second comparison circuit is connected with the first output end of the second signal generation unit, and the output end of the second comparison circuit is further connected with the second output end of the second signal generation unit through the second inverter; The second threshold generation circuit is configured to generate a second threshold; and the second comparison circuit is configured to output the third pulse width modulation sub-signal according to a comparison result of the amplitude voltage of the second triangular wave signal and the second threshold; The first output end of the second signal generation unit is configured to output the third pulse width modulation sub-signal, and the second output end of the second signal generation unit is configured to output the fourth pulse width modulation sub-signal; and the second inverter is configured to output the sub-starting current according to the second bus voltage when the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal are received. The phase difference between the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal is 180°.

[0013] Optionally, the simulation system further comprises an analog oscilloscope. The analog oscilloscope is connected with the current acquisition module; and the analog oscilloscope is configured to display the current waveform of the current acquired by the current acquisition module.

[0014] In another aspect, the disclosure also provides a simulation device for motor drag test, comprising the simulation system for motor drag test as described above.

[0015] The simulation system for motor drag test comprises an inductance adjusting circuit, a motor control circuit and a motor simulation circuit. The inductance adjusting circuit comprises a current collecting module and a coupled inductance group, and the current collecting module is connected with the coupled inductance group. The motor control circuit is connected with the coupled inductance group, and the motor simulation circuit is connected with the coupled inductance group. When starting the drag test, the current collecting module collects the starting current output by the motor control circuit, the motor simulation circuit generates a first pulse width modulation signal according to the starting current of the motor control circuit collected by the current collecting module, and outputs a first current to the coupled inductance group according to the first pulse width modulation signal. The first current of the motor simulation circuit is the working current under the stable operation of the simulation system. At this time, the motor simulation circuit will generate a pulse width modulation signal corresponding to the first current and continue to output the first current to the coupled inductance group. Under the stable operation of the simulation system, the inductance parameters of the coupled inductance group are adjusted. At this time, the current flowing through the coupled inductance group changes, and the current collecting module collects the changed current, which is a second current. The second current is compared with the current parameters of the preset current. When the current parameters of the two are different, the motor simulation circuit generates a pulse width modulation signal corresponding to the second current and continues to output the changed second current to the coupled inductance group to maintain the continuous operation of the motor simulation circuit, and continues to adjust the inductance parameters of the coupled inductance group until the current collecting module collects the second current with the same current parameters as the preset current, and determines that the first inductance parameter of the coupled inductance group at this time is the inductance parameter of the coupled inductance group under the condition that the simulation system meets the performance requirements. The preset current is the working current under the condition that the simulation system meets the performance requirements, that is, the current under the condition of the highest current frequency and the minimum current peak value of the motor simulation circuit. Therefore, under the stable operation of the simulation system, the inductance parameters of the coupled inductance group are adjusted to make the working current in the simulation system the same as the current parameters of the preset current meeting the performance requirements, and the inductance parameters of the coupled inductance are determined at this time, so that the inductance parameters of the coupled inductance meeting the performance requirements are obtained in the drag test of the motor, and the accurate selection of the coupled inductance is realized. Therefore, when the motor simulation circuit uses the coupled inductance determined by the test, the performance of the motor simulation circuit under the condition of the highest current frequency and the minimum current peak value can be accurately simulated. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0017] Figure 1A structural schematic diagram of a simulation system for motor drag test is provided for an embodiment of the present disclosure.

[0018] Figure 2 A structural schematic diagram of a simulation system for motor drag test is provided for an embodiment of the present disclosure.

[0019] Figure 3 A structural schematic diagram of a simulation system for motor drag test is provided for an embodiment of the present disclosure.

[0020] Figure 4 A waveform schematic diagram of a second triangular wave signal and a third pulse width modulation sub-signal is provided for an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application.

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 A structural schematic diagram of a simulation system for motor drag test is provided for an embodiment of the present disclosure, as shown in Figure 1 The simulation system includes an inductance adjusting circuit 100, a motor control circuit, and a motor simulation circuit 300.

[0024] The inductance adjusting circuit 100 includes a current collection module 110 and a coupled inductance group 120. The current collection module 110 is connected with the coupled inductance group 120, and the current collection module 110 is used to collect the current flowing through the coupled inductance group 120. The motor control circuit is connected with the coupled inductance group 120, and the motor control circuit is used to output a starting current.

[0025] For example, the coupled inductance group 120 includes at least one coupled inductance, and the inductance parameter of the coupled inductance group 120 is adjustable.

[0026] The motor simulation circuit 300 is connected with the coupling inductor group 120, and the motor simulation circuit 300 is also connected with the current collection module 110. The motor simulation circuit 300 is used to generate a first pulse width modulation signal according to the starting current of the motor control circuit collected by the current collection module 110, and is used to output a first current according to the first pulse width modulation signal. The first current of the motor simulation circuit 300 is the working current in the stable running state of the simulation system.

[0027] For example, the starting current can be the same as the first current. In the case where the starting current is the same as the first current, the motor simulation circuit 300 directly generates the first pulse width modulation signal according to the starting current, and outputs the first current to the coupling inductor group 120 according to the first pulse width modulation signal. The first current collected by the current collection module 110 is input into the motor simulation circuit 300 again, so that the motor simulation circuit 300 continues to generate the first pulse width modulation signal according to the first current, and continues to output the first current to the coupling inductor group 120 according to the first pulse width modulation signal, thereby realizing the stable running of the simulation system. In the case where the starting current is different from the first current, the motor simulation circuit 300 generates a corresponding pulse width modulation signal according to the starting current, and outputs a corresponding working current to the coupling inductor group 120 according to the pulse width modulation signal. The motor simulation circuit 300 has a current adjusting unit, which adjusts the working current when the system is not in a stable state, and continues to output to the coupling inductor group 120. The current collection module 110 inputs the working current collected again into the motor simulation circuit 300, until the input working current is the first current, the motor simulation circuit 300 continues to generate the first pulse width modulation signal according to the first current, and continues to output the first current to the coupling inductor group 120 according to the first pulse width modulation signal, thereby realizing the stable running of the simulation system.

[0028] In the process of adjusting the stable running of the simulation system, the inductance parameter of the coupling inductor group is a fixed value, which has been calculated according to the following formula before the drag test.

[0029] Wherein, U is the bus voltage value in the motor simulation circuit 300, L is the inductance value of the coupling inductor, Δi is the current change amount of the inductor per unit time, and Δt is the unit time.

[0030] Therefore, it can be calculated that the resistance parameter of the coupling inductor in the coupling inductor group is 0.02Ω, and the inductance value is 300μH.

[0031] It should be noted that the resistance parameter of the coupling inductor in the coupling inductor group is 0.02Ω, and the inductance value is 300μH, which is only an example and is not limited here.

[0032] In the case of stable operation of the simulation system, the inductance parameters of the coupling inductor group 120 are adjusted so that the second current collected by the current collection module 110 has the same current parameters as the preset current, and the first inductance parameters of the coupling inductor group 120 are obtained; wherein the preset current is the working current of the simulation system under the condition of meeting the performance requirements; and the first inductance parameters are the inductance parameters of the coupling inductor group 120 under the condition of meeting the performance requirements of the simulation system.

[0033] For example, the performance requirements met by the simulation system at least include that the output current of the motor simulation circuit is the current under the condition of the highest current frequency and the minimum current peak value, so the preset current is the current under the condition of meeting the highest current frequency and the minimum current peak value of the motor simulation circuit. In the case of stable operation of the simulation system, the inductance parameters of the coupling inductor group 120 are adjusted, at this time the first current output by the motor simulation circuit 300 will change after flowing through the coupling inductor group 120, and the current collection module 110 will collect the changed current, at this time the collected current is the second current. The motor simulation circuit 300 compares the second current with the current parameters of the preset current, when the current parameters of the two are different, the motor simulation circuit 300 will generate a pulse width modulation signal according to the second current, and continue to output the changed second current to the coupling inductor group 120. Since the current parameters of the second current and the preset current are different, the inductance parameters of the coupling inductor group 120 are continuously adjusted until the current collection module 110 collects the second current with the same current parameters as the preset current, and it is determined that the first inductance parameters of the coupling inductor group 120 at this time are the inductance parameters of the coupling inductor group under the condition of meeting the performance requirements of the simulation system.

[0034] Therefore, in the case of stable operation of the simulation system, the inductance parameters of the coupling inductor group 120 are adjusted so that the working current in the simulation system has the same current parameters as the preset current that meets the performance requirements, and at this time the inductance parameters of the coupling inductor are determined, so that the inductance parameters of the coupling inductor that can meet the performance requirements are obtained in the motor drag test, and the accurate selection of the coupling inductor is realized, so that the motor simulation circuit 300 can accurately simulate the performance of the motor simulation circuit 300 under the condition of the highest current frequency and the minimum current peak value when using the coupling inductor determined by the test.

[0035] In addition, the accurate selection of the coupling inductor can avoid the problem of abnormal increase of the no-load current caused by the fact that the motor simulation circuit 300 does not reach a stable operating state during the test, thereby ensuring the accurate evaluation of the control characteristics of the motor control circuit under the no-load condition. In addition, the problem of current peak decay of the motor simulation circuit 300 during high-speed simulation can be avoided, thereby ensuring the accurate evaluation of the control characteristics of the motor control circuit when the motor simulation circuit 300 is at the highest speed. Furthermore, the accuracy of the test evaluation is improved, thereby reducing the workload of the test personnel, accelerating the overall test speed, and saving manpower and cost.

[0036] It should be noted that the output current of the motor simulation circuit 300 under the condition of the highest current frequency and the minimum current peak is only an example, and is not limited herein.

[0037] In some embodiments, the motor simulation circuit is configured to perform closed-loop adjustment on the output pulse width modulation signal according to the starting current collected by the current collection module, and generate a first pulse width modulation signal when the third current is collected by the current collection module; wherein the third current is the working current generated after the closed-loop adjustment of the motor simulation circuit.

[0038] For example, the third current is the same as the first current. After receiving the starting current collected by the current collection module, the motor simulation circuit starts to perform closed-loop adjustment on the output pulse width modulation signal. The motor simulation circuit generates a corresponding pulse width modulation signal according to the starting current, and outputs a corresponding working current to the coupling inductor group according to the pulse width modulation signal. The motor simulation circuit has a current adjustment unit, which adjusts the working current when the system is not in a stable state, and continues to output to the coupling inductor group. The working current collected by the current collection module is input to the motor simulation circuit again. When the third current is collected by the current collection module, the motor simulation circuit generates a first pulse width modulation signal, and outputs a first current to the coupling inductor group according to the first pulse width modulation signal. After the current collection module collects the first current, the motor simulation circuit continues to generate a first pulse width modulation signal according to the first current, and continues to output a first current to the coupling inductor group according to the first pulse width modulation signal. Thus, the motor simulation circuit generates a pulse width modulation signal according to the current collected by the current collection module, and continues to generate a current according to the pulse width modulation signal. In addition, the motor simulation circuit adjusts the current collected by the current collection module, so that the current finally reaches the first current, thereby realizing the closed-loop adjustment of the output pulse width modulation signal, and stabilizing the operation of the simulation system.

[0039] In some embodiments, the motor simulation circuit comprises: a first signal generation module and a first inverter. The first signal generation module is connected with the current collection module, and the first signal generation module is configured to generate a pulse width modulation signal according to the current collected by the current collection module; the first inverter is connected with the first signal generation module; the first inverter is configured to output operating current according to the first bus voltage in the case of receiving the pulse width modulation signal generated by the first signal generation module; wherein the first bus voltage is the power supply voltage of the first inverter.

[0040] For example, after the current collection module collects the starting current, the first signal generation module generates a pulse width modulation signal corresponding to the starting current collected by the current collection module, and the first inverter outputs operating current corresponding to the first bus voltage after receiving the pulse width modulation signal corresponding to the starting current. After receiving the starting current collected by the current collection module, the motor simulation circuit starts to perform closed-loop adjustment on the output pulse width modulation signal, and after multiple closed-loop adjustments, the current collection module collects a third current, which is the same as the first current. In the case that the current collection module collects the third current, the first signal generation module generates a first pulse width modulation signal according to the third current, and the first inverter outputs the first current to the coupled inductor group according to the first bus voltage after receiving the first pulse width modulation signal. At this time, the current collection module collects the first current, the first signal generation module continues to generate the first pulse width modulation signal according to the first current, and the first inverter continues to output the first current to the coupled inductor group according to the first pulse width modulation signal, so as to make the simulation system run stably.

[0041] When the simulation system runs stably, the inductance parameters of the coupled inductor group are adjusted, and the first current output by the first inverter becomes a second current after flowing through the coupled inductor group. The first signal generation module compares the second current with the current parameters of the preset current, and when the current parameters of the two are different, the first signal generation module generates a pulse width modulation signal corresponding to the second current. After receiving the pulse width modulation signal corresponding to the second current, the first inverter outputs the changed second current according to the first bus voltage. Since the current parameters of the second current and the preset current are different, the inductance parameters of the coupled inductor group are continuously adjusted until the current collection module collects the second current with the same current parameters as the preset current, and it is determined that the first inductance parameter of the coupled inductor group at this time is the inductance parameter of the coupled inductor group that meets the performance requirements of the simulation system.

[0042] Therefore, in the case that the simulation system is stable, the current output by the first inverter is adjusted to be the same as the preset current parameter meeting the performance requirement by adjusting the inductance parameter of the coupled inductor group, and the inductance parameter of the coupled inductor is determined at this time, so that the inductance parameter of the coupled inductor meeting the performance requirement is obtained in the motor drag test, the coupled inductor is accurately selected, and therefore the first inverter can accurately simulate the performance of the first inverter under the condition of the highest frequency of the current and the minimum peak value of the current when the coupled inductor determined through the test is used.

[0043] In some embodiments, Figure 2 A structure diagram of another simulation system for motor drag test provided by the embodiment of the present disclosure is shown in FIG. 6. Figure 2 As shown in FIG. 5, the first signal generation module includes a reference current providing unit 310 and at least one first signal generation unit 320; the reference current providing unit 310 is configured to provide a sinusoidal current signal.

[0044] For example, the frequency of the sinusoidal current signal is 20 Hz, and the current amplitude is 5 A.

[0045] It should be noted that the frequency of the sinusoidal current signal is 20 Hz, which is only an example, and the frequency of the actual sinusoidal signal is the maximum current frequency in the actual circuit. The current amplitude of the sinusoidal current signal is 5 A, which is only an example, and the current amplitude of the actual sinusoidal signal is the rated current in the actual circuit.

[0046] The first signal generation unit 320 includes a first threshold generation circuit 321, a signal generation circuit 322, and a first inverter 323; the pulse width modulation signal generated by the first signal generation module includes a first pulse width modulation sub-signal and a second pulse width modulation sub-signal, and the working current output by the first inverter 330 includes at least one sub-working current.

[0047] The first input end of the first threshold generation circuit 321 is connected with the reference current providing unit 310, the second input end of the first threshold generation circuit 321 is connected with the current collection module 110, the output end of the first threshold generation circuit 321 is connected with the input end of the signal generation circuit 322, the output end of the signal generation circuit 322 is connected with the first output end 3201 of the first signal generation unit 320, and the output end of the signal generation circuit 322 is also connected with the second output end 3202 of the first signal generation unit 320 through the first inverter 323.

[0048] The first threshold generation circuit 321 is configured to calculate and generate a first threshold value according to the current collected by the current collection module 110 and the sinusoidal current signal; and the signal generation circuit 322 is configured to output a first pulse width modulation sub-signal according to the first threshold value.

[0049] The first output end 3201 of the first signal generation unit 320 is configured to output a first pulse width modulation sub-signal, and the second output end 3202 of the first signal generation unit 320 is configured to output a second pulse width modulation sub-signal; the first inverter 330 is configured to output a sub-working current according to the first bus voltage when the first pulse width modulation sub-signal and the second pulse width modulation sub-signal are received; and a phase difference between the first pulse width modulation sub-signal and the second pulse width modulation sub-signal is 180°.

[0050] For example, the first inverter 330 can be a three-phase inverter, and the first signal generation module includes three first signal generation units 320. Two output ends of each first signal generation unit 320 are connected to control ends of two semiconductor transistors in a same bridge arm of the first inverter 330, respectively. The first pulse width modulation sub-signal output by each first signal generation unit 320 has a different phase. The coupling inductor group 120 includes three coupling inductors, each of which is connected to an output end of a bridge arm of the first inverter 330, and is configured to receive the sub-working current output by the first inverter 330. The current acquisition module 110 is connected to the three coupling inductors, respectively, and is configured to acquire currents flowing through the three coupling inductors. The coupling inductor group 120 is also connected to the motor control circuit.

[0051] After the current acquisition module 110 acquires the initial currents flowing through the three coupling inductors, the second input end of the first threshold generation circuit 321 receives the initial currents, and the first threshold corresponding to the initial currents is calculated according to the initial currents and the sinusoidal current signal. The signal generation circuit 322 outputs the first pulse width modulation sub-signal corresponding to the initial currents according to the first threshold corresponding to the initial currents. The first output end 3201 of the first signal generation unit 320 is directly connected to the output end of the signal generation circuit 322, so that the first output end 3201 of the first signal generation unit 320 directly outputs the first pulse width modulation sub-signal corresponding to the initial currents. The second output end 3202 of the first signal generation unit 320 is connected to the output end of the signal generation circuit 322 through the first inverter 323, so that the second output end 3202 of the first signal generation unit 320 outputs the second pulse width modulation sub-signal corresponding to the initial currents after the first pulse width modulation sub-signal corresponding to the initial currents is inverted. After each bridge arm of the first inverter 330 sequentially receives each pulse width modulation sub-signal, the bridge arms are sequentially and alternately turned on, and the sub-working current is output to the three coupling inductors according to the bus voltage. The current acquisition module 110 continues to acquire the sub-working current flowing through the three coupling inductors, and the above working process is repeated, so that the first signal generation unit 320 is closed-loop regulated until the current acquisition module 110 acquires the first current flowing through the three coupling inductors. The first pulse width modulation sub-signal identical to the first pulse width modulation signal and the inverted second pulse width modulation sub-signal are output to the first inverter 330, and at this time, the simulation system runs stably.

[0052] After the simulation system is stable, the inductance parameters of the three coupled inductors are adjusted. At this time, the first current output by the three output terminals of the first inverter 330 becomes the second current after flowing through the coupled inductor group 120. The first signal generation unit 320 compares the second current with the current parameters of the preset current. When the current parameters of the two are different, the first threshold generation circuit 321 generates the first threshold corresponding to the second current according to the second current received by the second input terminal and the sine wave current signal. The signal generation circuit 322 outputs the first pulse width modulation sub-signal corresponding to the second current according to the first threshold corresponding to the second current. After receiving the first pulse width modulation sub-signal corresponding to the second current and the second pulse width modulation sub-signal, the first inverter 330 outputs the changed second current according to the first bus voltage. Since the current parameters of the second current and the preset current are different, the inductance parameters of the coupled inductor group 120 are continuously adjusted until the current parameters of the second current and the preset current collected by the current collection module 110 are the same. At this time, the first inductance parameter of the coupled inductor group 120 is determined as the inductance parameter of the coupled inductor group 120 under the condition that the simulation system meets the performance requirements.

[0053] It should be noted that the first inverter 330 can also be an inverter of other types except for a three-phase inverter, which is not specifically limited here.

[0054] In some embodiments, continuing to refer to Figure 2 , the first threshold generation circuit 321 includes a difference calculation circuit 3211, a current controller 3212, and a threshold generation sub-circuit.

[0055] The first input terminal of the difference calculation circuit 3211 is connected with the reference current providing unit 310, and the second input terminal of the difference calculation circuit 3211 is connected with the current collection module 110. The difference calculation circuit 3211 is used to calculate the current difference of the current value of the sine wave current signal and the current value of the current collected by the current collection module 110 at each time point.

[0056] The first signal generation module includes a first current inversion unit 341 and a second current inversion unit 342. The reference current providing unit 310 is connected to the first input end of the difference calculation circuit 3211 through the first current inversion unit 341, and the current collection module 110 is connected to the second input end of the difference calculation circuit 3211 through the second current inversion unit 342. The first current inversion unit 341 and the second current inversion unit 342 are used to ensure that the current difference between the current value of the sinusoidal current signal and the current value of the current collected by the current collection module 110 at each time point is a non-negative value. When the current collected by the current collection module 110 is the same as the current parameter of the sinusoidal current signal, the average of the current difference between the current value of the sinusoidal current signal and the current value of the current collected by the current collection module 110 is 0, and it is considered that the simulation system is stable.

[0057] The current controller 3212 is connected to the output end of the difference calculation circuit 3211, and the current controller 3212 is used to output a threshold parameter based on the value of the input current difference.

[0058] The current controller 3212 can be a PI controller, for example. In the closed-loop adjustment process of the motor simulation circuit, the current controller 3212 adjusts the proportional parameter and the integral parameter in it, so as to realize the adjustment of the threshold parameter output by the current controller 3212 according to the value of the current difference. When the simulation system is stable, the proportional parameter and the integral parameter of the current controller 3212 do not need to be adjusted any more. At this time, the proportional parameter and the integral parameter obtained are the proportional parameter and the integral parameter that meet the stable operation condition of the simulation system. The proportional parameter and the integral parameter of the current controller 3212 at this time are fixed, and the inductance parameter of the coupled inductor group is continued to be adjusted. At this time, the proportional parameter of the current controller is 82, and the integral parameter is 72.

[0059] It should be noted that the proportional parameter of the current controller is 82 and the integral parameter is 72, which is only an example and is not limited here.

[0060] The threshold generation sub-circuit includes a divider 3213 and a limiter 3214. The first input end of the divider 3213 is connected to the output end of the current controller 3212, and the second input end of the divider 3213 inputs a reference value. The divider 3213 is used to output the quotient value between the threshold parameter and the reference value.

[0061] The output end of the divider 3213 is connected with a limiter 3214, the limiter 3214 is connected with the input end of the signal generating circuit 322, and the limiter 3214 is used for limiting the quotient value between the threshold parameter output by the divider 3213 and the reference value in a first value range; wherein the quotient value between each threshold parameter limited in the first value range and the reference value is a first threshold value.

[0062] Exemplarily, since the direct current voltage value provided by the bus voltage in the first inverter 330 is a fixed value, the direct current voltage value provided by the bus voltage can be taken as the reference value, that is, the second input end of the divider 3213 is connected with the bus 331. The current controller 3212 can convert the input current difference value into a threshold parameter by adjusting the proportional parameter and the integral parameter in it, and the divider 3213 calculates the quotient value in the first value range according to the threshold parameter and the reference value. Since the current controller 3212 needs to adjust the threshold parameter output to the signal generating circuit 322, so as to adjust the pulse width modulation signal output by the signal generating circuit 322. And the numerical adjustment range of the threshold parameter may be a unit or ten units each time, and after passing through the divider, the numerical adjustment range can be accurate to several decimal places, so as to improve the adjustment accuracy of the threshold parameter, and therefore the quotient value between the threshold parameter and the reference value output by the divider 3213 is output to the signal generating circuit 322. The limiter 3214 is used for limiting the quotient value between the threshold parameter output by the divider 3213 and the reference value in the first value range, so as to avoid the problem that the subsequent circuit is damaged and calculation error is caused due to that the output quotient value is too large to exceed the first value range.

[0063] In some embodiments, continuing to refer to Figure 2 , the signal generating circuit 322 comprises a first triangular wave providing unit 3221 and a first comparison circuit 3222; the first triangular wave providing unit 3221 is used for providing a first triangular wave signal; The first input end of the first comparison circuit 3222 is connected with the first triangular wave providing unit 3221, the second input end of the first comparison circuit 3222 is connected with the first threshold value generating circuit 321, the output end of the first comparison circuit 3222 is connected with the first output end 3201 of the first signal generating unit 320, and the output end of the first comparison circuit 3222 is also connected with the second output end 3202 of the first signal generating unit 320 through the first inverter 323. The first comparison circuit 3222 is used for outputting a first pulse width modulation sub-signal according to the comparison result between the amplitude voltage of the first triangular wave signal and the first threshold value.

[0064] Exemplarily, the first threshold value generated by the first threshold value generating circuit 321 is a direct current voltage, and thus the first threshold value received by the second input end of the first comparison circuit 3222 is a fixed value. The first comparison circuit 3222 outputs a first pulse width modulation sub-signal according to the comparison result of the amplitude voltage of the first triangular wave signal and the first threshold value, and the first pulse width modulation sub-signal is high when the amplitude voltage of the first triangular wave signal is greater than the first threshold value, and the first pulse width modulation sub-signal is low when the amplitude voltage of the first triangular wave signal is less than the first threshold value.

[0065] In some embodiments, the motor control circuit comprises a second signal generating module and a second inverter.

[0066] The second signal generating module is configured to generate a second pulse width modulation signal; and the second inverter is connected to the second signal generating module and configured to output a starting current according to a second bus voltage when receiving the second pulse width modulation signal; wherein the second bus voltage is a power supply voltage of the second inverter.

[0067] Exemplarily, when the drag test is started, the second signal generating module generates a second pulse width modulation signal and outputs the second pulse width modulation signal to the second inverter, and the second inverter outputs a starting current to the coupled inductor group according to the second bus voltage when receiving the second pulse width modulation signal, so that the current collecting module collects the starting current, and then the motor simulation circuit starts to work. When the motor simulation circuit starts to work, the second signal generating module stops generating the second pulse width modulation signal, and the second inverter stops working, so that the motor simulation circuit enters a closed-loop regulation state. Thus, the motor control circuit realizes simulation of the motor controller and can realize starting of the motor simulation circuit.

[0068] In some embodiments, the first inverter and the second inverter share the same bus, and the first bus voltage and the second bus voltage are the same.

[0069] Exemplarily, the first bus voltage and the second bus voltage are the same, and both are 270 V.

[0070] In some embodiments, Figure 3 Another structure schematic diagram of a simulation system for motor drag test provided by the embodiments of the present disclosure is shown in FIG. 2. Figure 3 As shown in FIG. 2, the second signal generating module comprises a second triangular wave providing unit 210 and at least one second signal generating unit 220; and the second triangular wave providing unit 210 is configured to provide a second triangular wave signal.

[0071] The second signal generating unit 220 comprises a second threshold value generating circuit 221, a second comparison circuit 222, and a second inverter 223; the second pulse width modulation signal comprises a third pulse width modulation sub-signal and a fourth pulse width modulation sub-signal, and the starting current comprises at least one sub-starting current.

[0072] The first input end of the second comparison circuit 222 is connected with the second triangular wave providing unit 210, the second threshold generating circuit 221 is connected with the second input end of the second comparison circuit 222, the output end of the second comparison circuit 222 is connected with the first output end 2201 of the second signal generating unit 220, and the output end of the second comparison circuit 222 is also connected with the second output end 2202 of the second signal generating unit 220 through the second inverter 223.

[0073] The second threshold generating circuit 221 is configured to generate a second threshold value; and the second comparison circuit 222 is configured to output a third pulse width modulation sub-signal according to a comparison result of the amplitude voltage of the second triangular wave signal and the second threshold value.

[0074] The first output end 2201 of the second signal generating unit 220 is configured to output the third pulse width modulation sub-signal, and the second output end 2202 of the second signal generating unit 220 is configured to output a fourth pulse width modulation sub-signal; and the second inverter 230 is configured to output a sub-starting current according to the second bus voltage when the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal are received, and a phase difference between the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal is 180°.

[0075] For example, the second bus voltage is provided by the bus 331. The second inverter 230 can be a three-phase inverter, and the second signal generating module includes three second signal generating units 220. The two output ends of each second signal generating unit 220 are respectively connected with the control ends of two semiconductor transistors in the same bridge arm of the second inverter 230, and the phase of the third pulse width modulation sub-signal output by each second signal generating unit 220 is different. The coupling inductance group 120 includes three coupling inductances, each of which is connected with the output end of a bridge arm of the second inverter 230 and is configured to receive the sub-starting current output by the second inverter 230. The current collecting module 110 is connected with the three coupling inductances respectively, and is configured to collect the currents flowing through the three coupling inductances. The coupling inductance group 120 is also connected with the motor simulation circuit 300.

[0076] When the test of the drag test is started, the second threshold generating circuit 221 directly generates the second threshold value, and the second threshold value can be, for example, 0.5V. The frequency of the second triangular wave signal ranges from 1KHz to 30KHz. The second triangular wave providing unit 210 is configured to provide a second triangular wave signal with a frequency of 10KHz and an amplitude ranging from 0 to 1V. Figure 4 The waveform schematic diagram of the second triangular wave signal and the third pulse width modulation sub-signal provided by the embodiment of the present disclosure is as follows: Figure 4As shown, the second comparison circuit 222 outputs a third pulse width modulation sub-signal according to the comparison result of the amplitude voltage of the second triangular wave signal and the second threshold value, the third pulse width modulation sub-signal is high when the amplitude voltage of the second triangular wave signal is greater than the second threshold value, and the third pulse width modulation sub-signal is low when the amplitude voltage of the second triangular wave signal is less than the second threshold value.

[0077] The first output end 2201 of the second signal generating unit 220 is directly connected with the output end of the second comparison circuit 222, so that the first output end 2201 of the second signal generating unit 220 directly outputs the third pulse width modulation sub-signal. The second output end 2202 of the second signal generating unit 220 is connected with the output end of the second comparison circuit 222 through the second inverter 223, so that the second output end 2202 of the second signal generating unit 220 outputs the fourth pulse width modulation sub-signal after inverting the third pulse width modulation sub-signal. The bridge arms of the second inverter 230 are sequentially turned on in turn after sequentially receiving the respective pulse width modulation sub-signals, and sequentially output sub-starting currents to the three coupling inductances according to the bus voltage, the current collecting module 110 collects the sub-starting currents flowing through the three coupling inductances, and the motor simulation circuit 300 starts to work after receiving the sub-starting currents of the three coupling inductances. When the motor simulation circuit 300 starts to work, the second threshold value generating circuit 221 stops outputting the second threshold value, so that the second signal generating unit 220 stops outputting the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal, and the second inverter 230 stops working, and the motor simulation circuit 300 enters a closed-loop regulation state. Thus, the simulation of the motor controller is realized through the second triangular wave providing unit 210, the second signal generating unit 220 and the second inverter 230, and the motor simulation circuit 300 can be controlled to start to work.

[0078] It should be noted that the second inverter 230 can also be an inverter of other types except for a three-phase inverter, which is not specifically limited here.

[0079] It should be noted that the second threshold value is 0.5V. The frequency of the second triangular wave signal is 10KHz, and the amplitude range of 0 to 1V is only an example, which is not specifically limited here.

[0080] In some embodiments, the simulation system further comprises an analog oscilloscope; the analog oscilloscope is connected with the current collecting module; and the analog oscilloscope is used to display the current waveform of the current collected by the current collecting module.

[0081] Specifically, the oscilloscope can be used to collect the current waveform of the second current, and the current parameters of the preset current can be realized through the current waveform of the preset current. Therefore, by comparing the similarity of the current waveform of the second current collected by the oscilloscope and the current waveform of the preset current, it can be determined whether the second current is the same as the current parameters of the preset current. When it is determined that the current waveform of the second current is the same as the current waveform of the preset current, it is determined that the second current at this time meets the performance requirements of the simulation system, and it is determined that the first inductance parameter of the coupled inductance group at this time is the inductance parameter of the coupled inductance group under the condition that the simulation system meets the performance requirements. Thus, the coupled inductance is accurately selected, so that the motor simulation circuit can accurately simulate the performance of the motor simulation circuit under the condition of the highest frequency of the current and the minimum peak value of the current when the coupled inductance determined by the test is used.

[0082] The simulation device for motor drag test provided by the embodiment of the present application can realize the corresponding beneficial effects of the simulation system for motor drag test provided by the above-mentioned embodiments, and details are not described herein.

[0083] It can be understood that the simulation device for motor drag test provided by the embodiment of the present application can realize the corresponding beneficial effects of the simulation system for motor drag test provided by the above-mentioned embodiments, and details are not described herein.

[0084] It should be noted that, in this document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element preceded by "comprises... " does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0085] The above is only a specific embodiment of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A simulation system for testing motor-driven drag, characterized in that, include: An inductor adjustment circuit includes a current acquisition module and a coupling inductor group. The current acquisition module is connected to the coupling inductor group and is used to acquire the current flowing through the coupling inductor group. A motor control circuit is connected to the coupled inductor group, and the motor control circuit is used to output the starting current; A motor simulation circuit is connected to the coupled inductor group. The motor simulation circuit is used to generate a first pulse width modulation signal based on the starting current of the motor control circuit acquired by the current acquisition module. And for outputting a first current according to the first pulse width modulation signal; wherein, the first current of the motor simulation circuit is the operating current of the simulation system under stable operating conditions; When the simulation system is running stably, the inductance parameters of the coupled inductor group are adjusted so that the second current collected by the current acquisition module is the same as the current parameter of the preset current, and the first inductance parameter of the coupled inductor group is obtained; wherein, the preset current is the operating current of the simulation system when the performance requirements are met; and the first inductance parameter is the inductance parameter of the coupled inductor group when the performance requirements are met.

2. The simulation system according to claim 1, characterized in that, The motor simulation circuit is used to perform closed-loop adjustment of the output pulse width modulation signal based on the starting current acquired by the current acquisition module, and to generate the first pulse width modulation signal when the current acquisition module acquires the third current. The third current is the operating current generated after multiple closed-loop adjustments of the motor simulation circuit.

3. The simulation system according to claim 2, characterized in that, The motor simulation circuit includes: A first signal generation module is connected to the current acquisition module. The first signal generation module is used to generate a pulse width modulation signal based on the current acquired by the current acquisition module. A first inverter is connected to the first signal generation module; the first inverter is used to output operating current according to the first bus voltage when it receives a pulse width modulation signal generated by the first signal generation module. Wherein, the first bus voltage is the supply voltage of the first inverter.

4. The simulation system according to claim 3, characterized in that, The first signal generation module includes: a reference current providing unit and at least one first signal generation unit; the reference current providing unit is used to provide a sinusoidal current signal; The first signal generation unit includes a first threshold generation circuit, a signal generation circuit, and a first inverter; the pulse width modulation signal generated by the first signal generation module includes a first pulse width modulation sub-signal and a second pulse width modulation sub-signal, and the operating current output by the first inverter includes at least one sub-operating current. The first input terminal of the first threshold generation circuit is connected to the reference current providing unit, the second input terminal of the first threshold generation circuit is connected to the current acquisition module, the output terminal of the first threshold generation circuit is connected to the input terminal of the signal generation circuit, the output terminal of the signal generation circuit is connected to the first output terminal of the first signal generation unit, and the output terminal of the signal generation circuit is also connected to the second output terminal of the first signal generation unit through the first inverter. The first threshold generation circuit is used to calculate and generate a first threshold based on the current acquired by the current acquisition module and the sinusoidal current signal; the signal generation circuit is used to output a first pulse width modulation sub-signal based on the first threshold. The first output terminal of the first signal generation unit is used to output the first pulse width modulation sub-signal, and the second output terminal of the first signal generation unit is used to output the second pulse width modulation sub-signal; the first inverter is used to output the sub-operating current according to the first bus voltage when it receives the first pulse width modulation sub-signal and the second pulse width modulation sub-signal. The phase difference between the first pulse width modulation sub-signal and the second pulse width modulation sub-signal is 180°.

5. The simulation system according to claim 4, characterized in that, The first threshold generation circuit includes: A difference calculation circuit is provided, wherein the first input terminal of the difference calculation circuit is connected to the reference current providing unit, and the second input terminal of the difference calculation circuit is connected to the current acquisition module; the difference calculation circuit is used to calculate the current difference between the current value of the sinusoidal current signal and the current value acquired by the current acquisition module at various time points. A current controller is connected to the output of the difference calculation circuit, and the current controller is used to output a threshold parameter based on the input value of the current difference; The threshold generation sub-circuit includes a divider and a limiter; The first input terminal of the divider is connected to the output terminal of the current controller, the second input terminal of the divider is input with a reference value, and the divider is used to output the quotient between the threshold parameter and the reference value; The output of the divider is connected to the limiter, and the limiter is connected to the input of the signal generation circuit. The limiter is used to limit the quotient between the threshold parameter output by the divider and the reference value to a first value range. The quotient between each of the threshold parameters limited to the first numerical range and the reference value is the first threshold.

6. The simulation system according to claim 4, characterized in that, The signal generation circuit includes a first triangular wave providing unit and a first comparison circuit; the first triangular wave providing unit is used to provide a first triangular wave signal. The first input terminal of the first comparison circuit is connected to the first triangular wave providing unit, the second input terminal of the first comparison circuit is connected to the first threshold generating circuit, the output terminal of the first comparison circuit is connected to the first output terminal of the first signal generating unit, and the output terminal of the first comparison circuit is also connected to the second output terminal of the first signal generating unit through the first inverter. The first comparison circuit is used to output the first pulse width modulation sub-signal based on the comparison result between the amplitude voltage of the first triangular wave signal and the first threshold.

7. The simulation system according to claim 1, characterized in that, The motor control circuit includes: The second signal generation module is used to generate the second pulse width modulation signal; The second inverter is connected to the second signal generation module. The second inverter is used to output the starting current according to the second bus voltage when the second pulse width modulation signal is received. The second bus voltage is the power supply voltage of the second inverter.

8. The simulation system according to claim 7, characterized in that, The second signal generation module includes a second triangular wave providing unit and at least one second signal generation unit; the second triangular wave providing unit is used to provide a second triangular wave signal; The second signal generation unit includes a second threshold generation circuit, a second comparison circuit, and a second inverter; the second pulse width modulation signal includes a third pulse width modulation sub-signal and a fourth pulse width modulation sub-signal, and the starting current includes at least one sub-starting current; The first input terminal of the second comparison circuit is connected to the second triangular wave providing unit, the second threshold generating circuit is connected to the second input terminal of the second comparison circuit, the output terminal of the second comparison circuit is connected to the first output terminal of the second signal generating unit, and the output terminal of the second comparison circuit is also connected to the second output terminal of the second signal generating unit through the second inverter. The second threshold generation circuit is used to generate a second threshold; the second comparison circuit is used to output the third pulse width modulation sub-signal based on the comparison result between the amplitude voltage of the second triangular wave signal and the second threshold. The first output terminal of the second signal generation unit is used to output the third pulse width modulation sub-signal, and the second output terminal of the second signal generation unit is used to output the fourth pulse width modulation sub-signal; The second inverter is used to output the sub-start current based on the second bus voltage upon receiving the third pulse width modulation sub-signal and the fourth pulse width modulation sub-signal; The phase difference between the third pulse width modulator signal and the fourth pulse width modulator signal is 180°.

9. The simulation system according to claim 1, characterized in that, The simulation system also includes an analog oscilloscope; The analog oscilloscope is connected to the current acquisition module; the analog oscilloscope is used to display the current waveform acquired by the current acquisition module.

10. A simulation device for testing motor-driven drag, characterized in that, This includes a simulation system for motor-to-motor drag testing as described in any one of claims 1-9.

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