A method and related components for suppressing electromagnetic noise in a train and its traction motor.

Abstract

This application discloses an electromagnetic noise suppression method and related components for trains and their traction motors, applied in the field of rail transit technology. The method includes: determining whether noise suppression of the traction motor should be performed within a first speed range based on electromagnetic noise data of the traction motor; if so, controlling the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed when the train speed is within the first speed range; determining whether noise suppression of the traction motor should be performed within a second speed range based on electromagnetic noise data of the traction motor; if so, identifying the current harmonics to be suppressed when the train speed is within the second speed range, and suppressing the identified current harmonics by controlling the traction inverter. Applying this solution can effectively suppress the electromagnetic noise of the traction motor, improve the auditory experience, achieve the goal of effectively suppressing train noise, and enhance the passenger experience.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and in particular to a method and related components for suppressing electromagnetic noise in trains and their traction motors. Background Technology

[0002] The traction system is one of the core components of a rail vehicle and also a major source of noise. With increasing demands for passenger experience and acoustic comfort, noise standards are becoming increasingly stringent, highlighting noise issues as a pressing problem in the rail transit sector. Currently, not only are total noise levels required to meet relevant industry standards, but certain requirements are also being placed on sound quality.

[0003] In conclusion, how to effectively suppress train noise is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method and related components for suppressing electromagnetic noise in trains and their traction motors, so as to effectively suppress train noise.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for suppressing electromagnetic noise in a train traction motor, comprising:

[0007] Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the first vehicle speed range;

[0008] If so, when the train speed is within the first speed range, the switching frequency of the traction inverter connected to the traction motor is positively correlated with the train speed.

[0009] Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the second vehicle speed range;

[0010] If so, when the train speed is in the second speed range, the current harmonics to be suppressed are determined, and the determined current harmonics are suppressed by controlling the traction inverter.

[0011] Wherein, the first speed range is represented as [A, B], the second speed range is represented as [C, D], A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, D represents the upper speed limit set for the second speed range, and B≤C.

[0012] In one embodiment, determining whether to perform noise suppression of the traction motor within a first vehicle speed range based on the electromagnetic noise data of the traction motor includes:

[0013] Electromagnetic noise data was detected across the entire speed range of the train.

[0014] Determine whether the detected electromagnetic noise data within the first vehicle speed range contains noise levels exceeding a set noise threshold.

[0015] If so, noise suppression of the traction motor is performed within the first vehicle speed range;

[0016] If not, then noise suppression of the traction motor will not be performed within the first vehicle speed range.

[0017] In one embodiment, the step of controlling the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed when the train speed is within the first speed range includes:

[0018] When the train speed is within the first speed range, the modulation mode of the traction inverter connected to the traction motor is set to asynchronous modulation, and the switching frequency of the traction inverter is controlled to be positively correlated with the train speed.

[0019] In one embodiment, determining whether to perform noise suppression of the traction motor within the second vehicle speed range based on the electromagnetic noise data of the traction motor includes:

[0020] Electromagnetic noise data was detected across the entire speed range of the train.

[0021] Determine whether the detected electromagnetic noise data within the second vehicle speed range contains noise levels exceeding a set noise threshold.

[0022] If so, noise suppression of the traction motor is performed within the second speed range;

[0023] If not, then noise suppression of the traction motor will not be performed within the second speed range.

[0024] In one implementation, the current harmonics to be suppressed are identified, including:

[0025] When the train speed is within the second speed range, the electromagnetic noise data of the traction motor is subjected to spectrum analysis to obtain the spectrum analysis results;

[0026] Based on the spectrum analysis results, each excessive noise frequency was determined, and in combination with the rotational speed of the traction motor, the noise frequency order corresponding to each excessive noise frequency was determined.

[0027] Based on the noise frequency order and motor parameters, the current harmonics that generate each noise frequency order are determined, and the determined current harmonics are used as the current harmonics to be suppressed.

[0028] In one implementation, based on the various noise frequency orders and motor parameters, the current harmonics that generate each noise frequency order are determined, and the determined current harmonics are used as the current harmonics to be suppressed, including:

[0029] Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

[0030] Based on the correlation between electromagnetic force wave frequency and harmonic frequency, the current harmonics that generate each electromagnetic force wave frequency are determined, and the determined current harmonics are taken as the current harmonics to be suppressed.

[0031] In one implementation, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined based on the noise frequency order and motor parameters, including:

[0032] Based on the noise frequency order and the number of motor pole pairs, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

[0033] In one implementation, the determined current harmonics are suppressed by controlling the traction inverter, including:

[0034] The modulation mode of the traction inverter is set to synchronous modulation, and the determined current harmonics are suppressed by controlling the traction inverter.

[0035] In one implementation, the value of A is set to 0, B = C, and the value of D is the set maximum train speed.

[0036] In one embodiment, the suppression of determined current harmonics by controlling the traction inverter includes:

[0037] By controlling the traction inverter and adjusting the switching angle, the determined current harmonics are suppressed.

[0038] An electromagnetic noise suppression system for a train traction motor includes:

[0039] The first judgment module is used to determine whether noise suppression of the traction motor should be performed within the first vehicle speed range based on the electromagnetic noise data of the traction motor; if so, the first noise suppression module is triggered.

[0040] The first noise suppression module is used to control the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed when the train speed is within the first speed range.

[0041] The second judgment module is used to determine whether noise suppression of the traction motor should be performed within the second vehicle speed range based on the electromagnetic noise data of the traction motor; if so, the second noise suppression module is triggered.

[0042] The second noise suppression module is used to determine the current harmonics to be suppressed when the train speed is in the second speed range, and to suppress the determined current harmonics by controlling the traction inverter.

[0043] Wherein, the first speed range is represented as [A, B], the second speed range is represented as [C, D], A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, D represents the upper speed limit set for the second speed range, and B≤C.

[0044] In one implementation, the second determination module includes:

[0045] The second detection unit is used to detect electromagnetic noise data throughout the entire speed range of the train.

[0046] The second judgment unit is used to determine whether the detected electromagnetic noise data within the second vehicle speed range has a noise level exceeding a set noise threshold; if so, the second noise suppression module is triggered; if not, the second noise suppression module is not triggered.

[0047] In one embodiment, the second noise suppression module includes a current harmonic determination submodule and a traction inverter control submodule. The current harmonic determination submodule includes a spectrum analysis unit, a noise frequency order determination unit, and a current harmonic determination unit for each order.

[0048] The spectrum analysis unit is used to: perform spectrum analysis on the electromagnetic noise data of the traction motor when the train speed is within the second speed range, and obtain the spectrum analysis results;

[0049] The noise frequency order determination unit is used to: determine each excessive noise frequency based on the spectrum analysis results, and determine the noise frequency order corresponding to each excessive noise frequency in combination with the rotational speed of the traction motor.

[0050] The current harmonic determination unit is used to: determine the current harmonics that generate each noise frequency order based on each noise frequency order and motor parameters, and use the determined current harmonics as the current harmonics to be suppressed.

[0051] The traction inverter control submodule is used to suppress the determined current harmonics by controlling the traction inverter.

[0052] In one embodiment, the second noise suppression module includes a current harmonic determination submodule and a traction inverter control submodule.

[0053] The current harmonic determination submodule is used to: determine the current harmonics to be suppressed when the train speed is in the second speed range;

[0054] The traction inverter control submodule is specifically used to suppress the determined current harmonics by controlling the traction inverter and adjusting the switching angle.

[0055] An electromagnetic noise suppression device for a train traction motor, comprising:

[0056] Memory, used to store computer programs;

[0057] A processor for executing the computer program to implement the steps of the electromagnetic noise suppression method for train traction motors as described above.

[0058] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the electromagnetic noise suppression method for a train traction motor as described above.

[0059] A train includes an electromagnetic noise suppression device for a train traction motor as described above.

[0060] Applying the technical solution provided in this invention, considering that the electromagnetic noise of the traction motor has the greatest impact on auditory experience in the traction device, this application suppresses the electromagnetic noise of the traction motor to achieve train noise suppression. The first speed range is denoted as [A, B], and the second speed range is denoted as [C, D], where B≤C, meaning the first speed range refers to the low-speed zone, and the second speed range refers to the high-speed zone. If, based on the electromagnetic noise data of the traction motor, it is determined that noise suppression of the traction motor is necessary within the first speed range, it indicates that noise levels exceed the standard within the first speed range. In this application, the switching frequency of the traction inverter is controlled to be positively correlated with the train speed. This allows the sound emitted by the traction motor to gradually increase with the rotational speed, and the sound frequency also gradually increases, which is more in line with human auditory perception and improves sound quality. If, based on the electromagnetic noise data of the traction motor, it is determined that noise suppression of the traction motor needs to be performed in the second speed range, it indicates that there is excessive noise in the second speed range. In this regard, considering that the harmonics introduced in the stator current of the traction motor will generate high-speed rotating spatial harmonics in the air gap magnetic field, aggravating electromagnetic vibration and noise, the solution of this application will identify the current harmonics to be suppressed at this time, and then suppress the identified current harmonics by controlling the traction inverter, thereby effectively suppressing the electromagnetic noise of the traction motor.

[0061] In summary, the solution proposed in this application can effectively suppress the electromagnetic noise of the traction motor, improve the auditory perception of the human ear, achieve the goal of effectively suppressing train noise, and enhance the passenger experience. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0063] Figure 1 This is a flowchart illustrating the implementation of an electromagnetic noise suppression method for a train traction motor according to the present invention.

[0064] Figure 2 This is a schematic diagram of the electromagnetic noise suppression system for a train traction motor according to the present invention. Detailed Implementation

[0065] The core of this invention is to provide an electromagnetic noise suppression method for train traction motors, which can effectively suppress the electromagnetic noise of traction motors, improve the auditory perception of the human ear, achieve the purpose of effectively suppressing train noise, and improve the passenger experience.

[0066] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating the implementation of an electromagnetic noise suppression method for a train traction motor according to the present invention. The electromagnetic noise suppression method for the train traction motor may include the following steps:

[0068] Step S101: Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the first vehicle speed range; if so, proceed to step S102.

[0069] Specifically, based on the electromagnetic noise data of the traction motor, it can be determined whether noise suppression of the traction motor is needed within the first vehicle speed range. There are several ways to determine this; for example, a common method is to check if the noise level exceeds the standard when the vehicle speed is within the first speed range. Of course, in other implementations, more lenient or stricter triggering conditions can be set as needed to determine whether noise suppression of the traction motor is necessary within the first vehicle speed range.

[0070] The electromagnetic noise data of the traction motor can usually be detected by a sound sensor. The specific sensor type and placement can be set and adjusted according to the actual situation, as long as it can effectively detect the electromagnetic noise data of the traction motor, without affecting the implementation of the present invention.

[0071] Furthermore, the determination of whether noise suppression of the traction motor is needed in the first speed range can usually be predetermined. For example, for a specific train model, the electromagnetic noise data of the train's traction motor can be detected in advance during testing, thereby determining whether noise suppression of the train's traction motor is needed in the first speed range. In the subsequent actual operation of the train, the determination of whether noise suppression of the traction motor is needed in the first speed range can be made based on the previous judgment. Similarly, the determination of whether noise suppression of the traction motor is needed in the second speed range, as described later, can also usually be predetermined, so that in the actual operation of the train, the determination of whether noise suppression of the traction motor is needed in the second speed range can be made directly based on the previous judgment.

[0072] In one specific embodiment of the present invention, step S101 may specifically include:

[0073] Electromagnetic noise data was detected across the entire speed range of the train.

[0074] Determine whether the detected electromagnetic noise data within the first vehicle speed range exceeds the set noise threshold.

[0075] If so, noise suppression of the traction motor is performed within the first speed range;

[0076] If not, noise suppression of the traction motor will not be performed within the first speed range.

[0077] In this implementation, the determination of whether noise levels exceed the standard is used to decide whether noise suppression of the traction motor is necessary within the first speed range. Specifically, electromagnetic noise data can be detected throughout the train's entire speed range. For example, in experimental scenarios or during actual train operation, the train is controlled to gradually accelerate from 0 to its maximum speed. The electromagnetic noise data detected during this process represents the electromagnetic noise data throughout the train's entire speed range, or the electromagnetic noise data within the train's full speed range. In practical applications, the detected electromagnetic noise data is typically represented by a curve, with the horizontal axis representing speed and the vertical axis representing the noise level at different speeds.

[0078] If the noise level does not exceed the set noise threshold within the first speed range, it means that the detected electromagnetic noise data does not exceed the set noise threshold within the first speed range. Therefore, it is not necessary to suppress the noise of the traction motor within the first speed range. Conversely, if the noise level exceeds the set noise threshold once or multiple times within the first speed range, it is necessary to suppress the noise of the traction motor within the first speed range, i.e., to perform the operation of step S102.

[0079] Step S102: When the train speed is in the first speed range, the switching frequency of the traction inverter connected to the traction motor is positively correlated with the train speed.

[0080] When it is determined that noise suppression of the traction motor is required within the first speed range, the solution proposed in this application employs a method that controls the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed. That is, the switching frequency of the traction inverter is designed to correlate with changes in train speed, ensuring that the switching frequency changes linearly with the train speed, and consequently, with the traction motor speed. This design results in a gradual increase in the sound emitted by the traction motor as the train speed gradually increases, with the sound frequency also gradually increasing. This is more in line with human auditory perception and improves sound quality.

[0081] The first speed range is represented as [A, B], where A represents the lower speed limit set for the first speed range, and B represents the upper speed limit set for the first speed range. The specific values ​​of A and B can be set and adjusted according to actual needs. For example, A can be set to 0, so that the noise quality can be improved in accordance with step S102 during the train's start-up phase.

[0082] Furthermore, if it is determined from the electromagnetic noise data of the traction motor that noise suppression of the traction motor is not required in the first speed range, then when the train speed is in the first speed range, the specific control method of the traction inverter can be set and adjusted according to actual needs. For example, a common control method is to control the train speed by fixing the switching frequency of the traction inverter.

[0083] In one specific embodiment of the present invention, step S102 may specifically include:

[0084] When the train speed is within the first speed range, the modulation mode of the traction inverter connected to the traction motor is set to asynchronous modulation, and the switching frequency of the traction inverter is controlled to be positively correlated with the train speed.

[0085] In this embodiment, considering that the switching frequency of the traction inverter needs to be positively correlated with the train speed in the scheme of this application, the modulation mode of the traction inverter can be set to asynchronous modulation, which makes it easier to design the correlation between the switching frequency and the train speed, so as to achieve the purpose of linear change of the switching frequency with the speed of the traction motor.

[0086] Furthermore, it should be noted that during asynchronous modulation, the train speed cannot be too high; therefore, an upper limit for the first speed range needs to be set based on the actual situation. In practical applications, the first speed range is the low-speed zone for train operation, while the second speed range, described later, is the medium-to-high-speed zone for train operation.

[0087] Step S103: Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the second vehicle speed range. If so, proceed to step S104.

[0088] The steps S101 and S102 above address train noise suppression within the first speed range, while steps S103 and S104 address train noise suppression within the second speed range. Therefore, it can be understood that step S102 must be executed after step S101, and step S104 must be executed after step S103. However, there is no strict order requirement between steps S102 and S103. Figure 1 For ease of viewing and illustration, step S103 is placed after step S102.

[0089] Specifically, based on the electromagnetic noise data of the traction motor, it can be determined whether noise suppression of the traction motor is needed in the second speed range. There are several possible methods for this determination. Similar to the above, the commonly used method is to determine whether the noise level exceeds the standard when the vehicle speed is within the second speed range. Of course, in other specific implementations, more lenient or stricter triggering conditions can be set as needed to determine whether noise suppression of the traction motor is necessary in the second speed range.

[0090] For example, in one specific embodiment of the present invention, step S103 may specifically include:

[0091] Electromagnetic noise data was detected across the entire speed range of the train.

[0092] Determine whether the detected electromagnetic noise data within the second vehicle speed range exceeds the set noise threshold.

[0093] If so, noise suppression of the traction motor will be performed within the second speed range;

[0094] If not, noise suppression of the traction motor will not be performed in the second speed range.

[0095] In this implementation, similar to the above, it also involves determining whether noise levels exceed the standard to decide whether noise suppression of the traction motor is necessary in the second speed range. Specifically, electromagnetic noise data across the entire speed range of the train can be detected first. For example, in experimental scenarios or during actual train operation, the train is controlled to gradually accelerate from 0 speed to its maximum speed. The electromagnetic noise data detected during this process represents the electromagnetic noise data across the entire speed range of the train, or the electromagnetic noise data across the entire speed range of the train. In practical applications, the detected electromagnetic noise data can usually be represented by a curve, with the horizontal axis representing speed and the vertical axis representing the noise level at different speeds.

[0096] If the noise level does not exceed the set noise threshold within the second speed range, it means that the detected electromagnetic noise data does not exceed the set noise threshold within the second speed range. Therefore, it is not necessary to suppress the noise of the traction motor within the second speed range. For example, the default control method can be used to control the traction inverter. Of course, there are various specific control methods that can be set and adjusted according to actual needs.

[0097] Conversely, if the noise level exceeds the set noise threshold once or multiple times within the second speed range, noise suppression of the traction motor needs to be performed within the second speed range, i.e., the operation of step S104 needs to be executed.

[0098] Step S104: When the train speed is in the second speed range, the current harmonics to be suppressed are determined, and the determined current harmonics are suppressed by controlling the traction inverter.

[0099] The first speed range is represented as [A, B], and the second speed range is represented as [C, D]. A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, and D represents the upper speed limit set for the second speed range, with B ≤ C.

[0100] When it is determined that noise suppression of the traction motor is required in the second speed range, the method used in this application is to identify the current harmonics to be suppressed, and then suppress the identified current harmonics by controlling the traction inverter.

[0101] This is because, in the traction system, the electromagnetic noise of the traction motor has the greatest impact on the auditory experience. The root cause of electromagnetic noise is electromagnetic vibration, which is excited by the electromagnetic force generated by the air gap magnetic field of the motor acting on the motor core. For the traction motor, its power supply is the traction inverter connected to it. The harmonics introduced in the stator current will generate high-speed rotating spatial harmonics in the air gap magnetic field, thus making the electromagnetic vibration and noise situation more complicated.

[0102] Therefore, the current harmonics to be suppressed will be identified. That is, within the second vehicle speed range, the current harmonics that cause the electromagnetic noise data of the traction motor to exceed the standard will be identified. Then, the current harmonics to be suppressed will be introduced into the control algorithm. In this way, by controlling the traction inverter, the purpose of suppressing specific harmonics can be achieved, which will improve the problem of prominent electromagnetic noise caused by the electromagnetic force generated by these specific harmonics exciting the motor modal resonance.

[0103] When suppressing the identified current harmonics, there are various specific suppression methods that can be set and adjusted according to actual needs.

[0104] The second speed range is represented as [C, D], where C represents the lower speed limit set for the second speed range, and D represents the upper speed limit set for the second speed range. The specific values ​​of C and D can be set and adjusted according to actual needs, but B ≤ C is required.

[0105] In one specific embodiment of the present invention, the value of A can be set to 0, B = C, and the value of D can be the set maximum train speed. It can be seen that the design of the values ​​of A, B, C, and D in this embodiment enables electromagnetic noise suppression of the train traction motor across the entire speed range. Furthermore, as described above, in practical applications, the first speed range is the low-speed range of train operation, while the second speed range is the medium-to-high-speed range of train operation.

[0106] In one specific embodiment of the present invention, the determination of each current harmonic to be suppressed as described in step S104 may specifically include the following steps:

[0107] Step 1: When the train speed is within the second speed range, perform spectrum analysis on the electromagnetic noise data of the traction motor to obtain the spectrum analysis results;

[0108] Step 2: Based on the spectrum analysis results, determine the frequencies of each excessive noise, and in combination with the rotational speed of the traction motor, determine the noise frequency order corresponding to each excessive noise frequency;

[0109] Step 3: Based on the noise frequency order and motor parameters, determine the current harmonics that generate each noise frequency order, and use the determined current harmonics as the current harmonics to be suppressed.

[0110] This implementation takes into account that different current harmonics produce noise at different frequencies. Therefore, the current harmonics that need to be suppressed can be determined based on the noise frequency.

[0111] Specifically, the electromagnetic noise data of the traction motor can be analyzed by spectrum analysis when the train speed is in the second speed range to obtain the spectrum analysis results.

[0112] By analyzing the spectral results, the frequencies of noise exceeding the standard can be identified. For example, 300Hz and 450Hz can be identified as frequencies exceeding the standard. It is understandable that the criteria for determining the frequencies exceeding the standard can be preset and adjusted according to actual needs.

[0113] After identifying each excessive noise frequency, the corresponding noise frequency order can be determined by combining the rotational speed of the traction motor. Typically, for any one excessive noise frequency, the rotational speed of the traction motor at the moment that excessive noise frequency is generated can be determined. Dividing the excessive noise frequency by the rotational speed of the traction motor will give the noise frequency order corresponding to that excessive noise frequency.

[0114] The noise frequency orders obtained are the noise frequency orders that need to be suppressed. They are affected by motor parameters and harmonic orders. Therefore, based on the noise frequency orders and motor parameters, the current harmonics that generate each noise frequency order can be determined, and thus the current harmonics to be suppressed can be obtained.

[0115] In one specific embodiment of the present invention, step three above may specifically include:

[0116] Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

[0117] Based on the correlation between electromagnetic force wave frequency and harmonic frequency, the current harmonics that generate each electromagnetic force wave frequency are determined, and the determined current harmonics are taken as the current harmonics to be suppressed.

[0118] As described above, the various noise frequency orders are influenced by motor parameters and harmonic orders. Therefore, based on the obtained noise frequency orders and motor parameters, the corresponding current harmonics that generate each noise frequency order can be determined according to their relationships. There are multiple ways to implement this operation, as long as the correlation between the noise frequency orders, motor parameters, and current harmonic orders can be determined. For example, a correlation equation or model can be established through theoretical analysis, or the correspondence between these three can be summarized through experimental data.

[0119] This implementation further considers that electromagnetic vibration is excited by the electromagnetic force generated by the air gap magnetic field of the motor acting on the motor core. That is, the frequency order of the generated noise is directly related to the frequency of the electromagnetic force wave. Therefore, the frequencies of the electromagnetic force waves that generate each noise frequency order can be determined first based on the noise frequency order and motor parameters, which is a relatively convenient process. Then, based on the correlation between the electromagnetic force wave frequency and harmonic frequencies, the current harmonics that generate each electromagnetic force wave frequency can be determined, which is also relatively convenient. In practical applications, the correlation between the electromagnetic force wave frequency and harmonic frequencies, and the correlation between the noise frequency order, motor parameters, and electromagnetic force wave frequency can be determined in advance through experimental data and / or theoretical analysis, which is also relatively convenient.

[0120] Furthermore, based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined, which can specifically include:

[0121] Based on the noise frequency order and the number of motor pole pairs, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

[0122] This implementation takes into account that, among the motor parameters, the number of motor pole pairs mainly affects the correlation between the noise frequency order and the electromagnetic force wave frequency. Therefore, in this implementation, other motor parameters can be ignored, and only the number of motor pole pairs can be used. Combined with the noise frequency order, the frequencies of each electromagnetic force wave that generate each noise frequency order can be easily and quickly determined. This method is convenient to operate and has a high accuracy rate.

[0123] In one specific embodiment of the present invention, step S104, which describes suppressing the determined current harmonics by controlling the traction inverter, includes:

[0124] The modulation mode of the traction inverter is set to synchronous modulation, and the determined current harmonics are suppressed by controlling the traction inverter.

[0125] This implementation takes into account that when the train speed is high, the switching frequency of the traction inverter is high, and the high-frequency performance of synchronous modulation is better and the waveform is more stable. Therefore, when the train speed is in the second speed range, the modulation mode of the traction inverter can be set to synchronous modulation, and then the determined current harmonics can be suppressed by controlling the traction inverter.

[0126] In one specific embodiment of the present invention, the suppression of the determined current harmonics by controlling the traction inverter as described in step S104 may specifically include:

[0127] By controlling the traction inverter and adjusting the switching angle, the determined current harmonics are suppressed.

[0128] As described above, there are various suppression methods available for the identified current harmonics, which can be set and adjusted according to actual needs. This implementation takes into account that different switching angles have different effects on harmonics. Therefore, this implementation does not require the introduction of complex control loops. Instead, it suppresses the identified current harmonics by adjusting the switching angle based on the original control method, making the solution simple, convenient, and cost-effective to implement.

[0129] Furthermore, the specific method for adjusting the switching angle can be determined through theoretical analysis or experimental data. For example, a simple approach is to conduct experiments at different switching angles for a specific harmonic to be suppressed at a certain train speed, and then take the switching angle that minimizes the harmonic as the optimal switching angle. Thus, within a certain speed range, the traction inverter can be controlled according to this optimal switching angle.

[0130] Applying the technical solution provided in this invention, considering that the electromagnetic noise of the traction motor has the greatest impact on auditory experience in the traction device, this application suppresses the electromagnetic noise of the traction motor to achieve train noise suppression. The first speed range is denoted as [A, B], and the second speed range is denoted as [C, D], where B≤C, meaning the first speed range refers to the low-speed zone, and the second speed range refers to the high-speed zone. If, based on the electromagnetic noise data of the traction motor, it is determined that noise suppression of the traction motor is necessary within the first speed range, it indicates that noise levels exceed the standard within the first speed range. In this application, the switching frequency of the traction inverter is controlled to be positively correlated with the train speed. This allows the sound emitted by the traction motor to gradually increase with the rotational speed, and the sound frequency also gradually increases, which is more in line with human auditory perception and improves sound quality. If, based on the electromagnetic noise data of the traction motor, it is determined that noise suppression of the traction motor needs to be performed in the second speed range, it indicates that there is excessive noise in the second speed range. In this regard, considering that the harmonics introduced in the stator current of the traction motor will generate high-speed rotating spatial harmonics in the air gap magnetic field, aggravating electromagnetic vibration and noise, the solution of this application will identify the current harmonics to be suppressed at this time, and then suppress the identified current harmonics by controlling the traction inverter, thereby effectively suppressing the electromagnetic noise of the traction motor.

[0131] In summary, the solution proposed in this application can effectively suppress the electromagnetic noise of the traction motor, improve the auditory perception of the human ear, achieve the goal of effectively suppressing train noise, and enhance the passenger experience.

[0132] Corresponding to the above method embodiments, this invention also provides an electromagnetic noise suppression system for a train traction motor, which can be referred to in conjunction with the above.

[0133] See Figure 2 The diagram shown is a structural schematic of an electromagnetic noise suppression system for a train traction motor according to the present invention, comprising:

[0134] The first judgment module 201 is used to determine whether to perform noise suppression of the traction motor within the first vehicle speed range based on the electromagnetic noise data of the traction motor; if so, the first noise suppression module is triggered.

[0135] The first noise suppression module 202 is used to control the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed when the train speed is in the first speed range.

[0136] The second judgment module 203 is used to determine whether to perform noise suppression of the traction motor in the second vehicle speed range based on the electromagnetic noise data of the traction motor; if so, the second noise suppression module is triggered.

[0137] The second noise suppression module 204 is used to determine the current harmonics to be suppressed when the train speed is in the second speed range, and to suppress the determined current harmonics by controlling the traction inverter.

[0138] The first speed range is represented as [A, B], and the second speed range is represented as [C, D]. A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, and D represents the upper speed limit set for the second speed range, with B ≤ C.

[0139] In one specific embodiment of the present invention, the first determination module 201 includes:

[0140] The first detection unit is used to detect electromagnetic noise data throughout the entire speed range of the train.

[0141] The first judgment unit is used to determine whether the detected electromagnetic noise data within the first vehicle speed range has a noise level exceeding a set noise threshold; if so, the first noise suppression module is triggered; if not, the first noise suppression module is not triggered.

[0142] In one specific embodiment of the present invention, the first noise suppression module 202 is specifically used for:

[0143] When the train speed is within the first speed range, the modulation mode of the traction inverter connected to the traction motor is set to asynchronous modulation, and the switching frequency of the traction inverter is controlled to be positively correlated with the train speed.

[0144] In one specific embodiment of the present invention, the second determination module 203 includes:

[0145] The second detection unit is used to detect electromagnetic noise data throughout the entire speed range of the train.

[0146] The second judgment unit is used to determine whether the detected electromagnetic noise data in the second vehicle speed range has a noise level exceeding the set noise threshold; if so, the second noise suppression module is triggered; if not, the second noise suppression module is not triggered.

[0147] In one specific embodiment of the present invention, the second noise suppression module 204 includes a current harmonic determination submodule and a traction inverter control submodule. The current harmonic determination submodule includes a spectrum analysis unit, a noise frequency order determination unit, and a current harmonic determination unit for each order.

[0148] The spectrum analysis unit is used to perform spectrum analysis on the electromagnetic noise data of the traction motor when the train speed is in the second speed range, and to obtain the spectrum analysis results.

[0149] The noise frequency order determination unit is used to: determine each excessive noise frequency based on the spectrum analysis results, and determine the noise frequency order corresponding to each excessive noise frequency in combination with the rotational speed of the traction motor.

[0150] The current harmonic determination unit is used to: determine the current harmonics that generate each noise frequency order based on each noise frequency order and motor parameters, and use the determined current harmonics as the current harmonics to be suppressed.

[0151] The traction inverter control submodule is used to suppress the determined current harmonics by controlling the traction inverter.

[0152] In one specific embodiment of the present invention, the current harmonic determination unit is specifically used for:

[0153] Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

[0154] Based on the correlation between electromagnetic force wave frequency and harmonic frequency, the current harmonics that generate each electromagnetic force wave frequency are determined, and the determined current harmonics are taken as the current harmonics to be suppressed.

[0155] In one specific embodiment of the present invention, the current harmonic determination unit determines the frequencies of the electromagnetic force waves that generate the respective noise frequencies based on the noise frequency orders and motor parameters, specifically including:

[0156] The current harmonic determination unit determines the frequency of each electromagnetic force wave that generates each noise frequency order based on the noise frequency order and the number of motor pole pairs.

[0157] In one specific embodiment of the present invention, the second noise suppression module 204 suppresses the determined current harmonics by controlling the traction inverter, including:

[0158] The modulation mode of the traction inverter is set to synchronous modulation, and the determined current harmonics are suppressed by controlling the traction inverter.

[0159] In one specific embodiment of the present invention, the value of A is set to 0, B = C, and the value of D is the set maximum train speed.

[0160] In one specific embodiment of the present invention, the second noise suppression module 204 includes a current harmonic determination submodule and a traction inverter control submodule;

[0161] The current harmonic determination submodule is used to: determine the current harmonics to be suppressed when the train speed is in the second speed range;

[0162] The traction inverter control submodule is specifically used to suppress the determined current harmonics by controlling the traction inverter and adjusting the switching angle.

[0163] Corresponding to the above method and system embodiments, this invention also provides an electromagnetic noise suppression device for a train traction motor, a computer-readable storage medium, and a train.

[0164] The electromagnetic noise suppression device for the train's traction motor may include:

[0165] Memory, used to store computer programs;

[0166] A processor for executing a computer program to implement the steps of the electromagnetic noise suppression method for a train traction motor as described in any of the above embodiments.

[0167] The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the electromagnetic noise suppression method for a train traction motor as described in any of the above embodiments. The computer-readable storage medium referred to herein includes random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0168] The train may include electromagnetic noise suppression devices for the train traction motor as described above, which will not be repeated here.

[0169] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0170] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0171] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A method for suppressing electromagnetic noise in a train traction motor, characterized in that, include: Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the first vehicle speed range; If so, when the train speed is within the first speed range, the switching frequency of the traction inverter connected to the traction motor is positively correlated with the train speed. Based on the electromagnetic noise data of the traction motor, determine whether noise suppression of the traction motor should be performed within the second vehicle speed range; If so, when the train speed is in the second speed range, the current harmonics to be suppressed are determined, and the determined current harmonics are suppressed by controlling the traction inverter. Wherein, the first speed range is represented as [A, B], the second speed range is represented as [C, D], A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, D represents the upper speed limit set for the second speed range, and B≤C; The current harmonics to be suppressed are identified, including: When the train speed is within the second speed range, the electromagnetic noise data of the traction motor is subjected to spectrum analysis to obtain the spectrum analysis results; Based on the spectrum analysis results, each excessive noise frequency was determined, and in combination with the rotational speed of the traction motor, the noise frequency order corresponding to each excessive noise frequency was determined. Based on the noise frequency order and motor parameters, the current harmonics that generate each noise frequency order are determined, and the determined current harmonics are used as the current harmonics to be suppressed. Based on the various noise frequency orders and motor parameters, the current harmonics that generate each noise frequency order are determined, and these determined current harmonics are used as the current harmonics to be suppressed, including: Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined. Based on the correlation between electromagnetic force wave frequency and harmonic frequency, the current harmonics that generate each electromagnetic force wave frequency are determined, and the determined current harmonics are taken as the current harmonics to be suppressed. The suppression of determined current harmonics by controlling the traction inverter includes: By controlling the traction inverter and adjusting the switching angle, the determined current harmonics are suppressed.

2. The electromagnetic noise suppression method for train traction motors according to claim 1, characterized in that, The step of determining whether to perform noise suppression of the traction motor within the first vehicle speed range based on the electromagnetic noise data of the traction motor includes: Electromagnetic noise data was detected across the entire speed range of the train. Determine whether the detected electromagnetic noise data within the first vehicle speed range contains noise levels exceeding a set noise threshold. If so, noise suppression of the traction motor is performed within the first vehicle speed range; If not, then noise suppression of the traction motor will not be performed within the first vehicle speed range.

3. The electromagnetic noise suppression method for train traction motors according to claim 1, characterized in that, When the train speed is within the first speed range, controlling the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed includes: When the train speed is within the first speed range, the modulation mode of the traction inverter connected to the traction motor is set to asynchronous modulation, and the switching frequency of the traction inverter is controlled to be positively correlated with the train speed.

4. The electromagnetic noise suppression method for train traction motors according to claim 1, characterized in that, The step of determining whether to perform noise suppression of the traction motor within the second vehicle speed range based on the electromagnetic noise data of the traction motor includes: Electromagnetic noise data was detected across the entire speed range of the train. Determine whether the detected electromagnetic noise data within the second vehicle speed range contains noise levels exceeding a set noise threshold. If so, noise suppression of the traction motor is performed within the second speed range; If not, then noise suppression of the traction motor will not be performed within the second speed range.

5. The electromagnetic noise suppression method for train traction motors according to claim 4, characterized in that, Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined, including: Based on the noise frequency order and the number of motor pole pairs, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined.

6. The electromagnetic noise suppression method for train traction motors according to claim 1, characterized in that, By controlling the traction inverter, the determined current harmonics are suppressed, including: The modulation mode of the traction inverter is set to synchronous modulation, and the determined current harmonics are suppressed by controlling the traction inverter.

7. The electromagnetic noise suppression method for train traction motors according to claim 1, characterized in that, The value of A is set to 0, B = C, and the value of D is the set maximum train speed.

8. An electromagnetic noise suppression system for a train traction motor, characterized in that, include: The first judgment module is used to determine whether to perform noise suppression of the traction motor within the first vehicle speed range based on the electromagnetic noise data of the traction motor. If so, the first noise suppression module is triggered; The first noise suppression module is used to control the switching frequency of the traction inverter connected to the traction motor to be positively correlated with the train speed when the train speed is within the first speed range. The second judgment module is used to determine whether noise suppression of the traction motor should be performed within the second vehicle speed range based on the electromagnetic noise data of the traction motor; if so, the second noise suppression module is triggered. The second noise suppression module is used to determine the current harmonics to be suppressed when the train speed is in the second speed range, and to suppress the determined current harmonics by controlling the traction inverter. Wherein, the first speed range is represented as [A, B], the second speed range is represented as [C, D], A represents the lower speed limit set for the first speed range, B represents the upper speed limit set for the first speed range, C represents the lower speed limit set for the second speed range, D represents the upper speed limit set for the second speed range, and B≤C; The second noise suppression module includes a current harmonic determination submodule and a traction inverter control submodule. The current harmonic determination submodule includes a spectrum analysis unit, a noise frequency order determination unit, and a current harmonic determination unit for each order. The spectrum analysis unit is used to: perform spectrum analysis on the electromagnetic noise data of the traction motor when the train speed is within the second speed range, and obtain the spectrum analysis results; The noise frequency order determination unit is used to: determine each excessive noise frequency based on the spectrum analysis results, and determine the noise frequency order corresponding to each excessive noise frequency in combination with the rotational speed of the traction motor. The current harmonic determination unit is used to: determine the current harmonics that generate each noise frequency order based on each noise frequency order and motor parameters, and use the determined current harmonics as the current harmonics to be suppressed. The traction inverter control submodule is used to suppress the determined current harmonics by controlling the traction inverter. The current harmonic determination unit is specifically used for: Based on the various noise frequency orders and motor parameters, the frequencies of the electromagnetic force waves that generate each noise frequency order are determined. Based on the correlation between electromagnetic force wave frequency and harmonic frequency, the current harmonics that generate each electromagnetic force wave frequency are determined, and the determined current harmonics are taken as the current harmonics to be suppressed. The current harmonic determination submodule is used to: determine the current harmonics to be suppressed when the train speed is in the second speed range; The traction inverter control submodule is specifically used to suppress the determined current harmonics by controlling the traction inverter and adjusting the switching angle.

9. The electromagnetic noise suppression system for a train traction motor according to claim 8, characterized in that, The second judgment module includes: The second detection unit is used to detect electromagnetic noise data throughout the train's entire speed range. The second judgment unit is used to determine whether the detected electromagnetic noise data within the second vehicle speed range has a noise level exceeding a set noise threshold; if so, the second noise suppression module is triggered; if not, the second noise suppression module is not triggered.

10. An electromagnetic noise suppression device for a train traction motor, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the electromagnetic noise suppression method for a train traction motor as described in any one of claims 1 to 7.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the electromagnetic noise suppression method for a train traction motor as described in any one of claims 1 to 7.

12. A train, characterized in that, Includes the electromagnetic noise suppression device for the train traction motor as described in claim 10.

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