Wheel diameter difference traction motor temperature rise early warning method and system and rail transit vehicle

Abstract

The present disclosure provides a wheel diameter difference traction motor temperature rise early warning method, system and rail transit vehicle. According to the actual measurement value of the wheel diameter difference, it is judged whether the wheel diameter difference meets the requirements of the corresponding position. If the requirements are met, the power of the traction motor is calculated in combination with the motor characteristic parameters and the inverter parameters under normal operation conditions. According to the line information, the temperature rise threshold interval is fitted. The motor loss is calculated, and the motor loss is converted into the temperature rise of the traction motor. It is judged whether the theoretical value of the motor temperature rise at this time exceeds the temperature rise threshold interval. If it exceeds, an early warning is given and an optimization request for turning repair is proposed. The present disclosure avoids the risk of traction motor temperature rise and optimizes the evaluation of the wheel set turning repair standard in the design and whole life cycle of rail transit.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of rail transit vehicle evaluation and early warning, and particularly relates to a wheel diameter difference traction motor temperature rise early warning method and system and a rail transit vehicle. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] The traction motor used by the rail transit vehicle is the most important core component in the traction system. Under the premise of ensuring good working characteristics, the traction motor temperature rise determines one of the important factors for optimizing the evaluation of the rail transit vehicle fault prediction and health management (PHM) model diagnosis method and the wheel set turning standard.

[0004] There is no reference method for the simulation of actual traction characteristics, combined with the simulation and test evaluation of the influence of different wheel diameter differences on the traction motor temperature rise. However, the temperature rise of the motor determines the optimization mode of the turning standard in the maintenance cycle, which is an important factor for designers to consider first. Therefore, the traction motor temperature rise needs to be evaluated in the design stage to avoid some actual problems caused by temperature rise. SUMMARY

[0005] The present disclosure proposes a wheel diameter difference traction motor temperature rise early warning method and system and a rail transit vehicle to avoid the risk of traction motor temperature rise and optimize the evaluation of the wheel set turning standard in the design and whole life cycle of the rail transit.

[0006] According to some embodiments, the present disclosure adopts the following technical solution:

[0007] A wheel diameter difference traction motor temperature rise early warning method, comprising the following steps:

[0008] According to the actual measurement value of the wheel diameter difference, it is judged whether the wheel diameter difference meets the requirements of the corresponding position;

[0009] If the requirements are met, the power of the traction motor is calculated in combination with the motor characteristic parameters and the inverter parameters under normal operating conditions;

[0010] According to the line information, the temperature rise threshold interval is fitted;

[0011] The motor loss is calculated, and the motor loss is converted into the traction motor temperature rise;

[0012] It is judged whether the theoretical value of the motor temperature rise at this time exceeds the temperature rise threshold interval, and if it exceeds, an early warning is given and a turning optimization request is proposed.

[0013] As an alternative implementation, the process of determining whether the wheel diameter difference meets the requirements of the corresponding position specifically includes: determining whether the wheel diameter difference meets the shaft, frame, vehicle and inter-vehicle parameter requirements according to the actual measured value of the wheel diameter difference, and if so, it is determined that the requirements are met, and if not, a grinding optimization request is directly proposed.

[0014] As an alternative implementation, in the process of obtaining the motor characteristic parameters under normal operating conditions, it is provided that under normal operating conditions, each traction motor adopts a parallel power supply mode, the supply voltage amplitude and frequency of each motor are the same, and the speed of each traction motor and the sum of the currents of each traction motor are collected.

[0015] As a further limitation, the average speed of each traction motor is calculated as the traction motor speed, i.e. the rotational speed, and the correlation between the rotational speed and the slip ratio under the corresponding operating conditions is used to determine the slip ratio and the motor power.

[0016] As an alternative implementation, in the process of obtaining the traction inverter characteristic parameters under normal operating conditions, it is provided that the traction inverter controls each motor as an equivalent average motor.

[0017] As a further limitation, the traction inverter controls each motor as an equivalent average motor, and the relationship between the corresponding torque, power, flux linkage and slip parameters is obtained in combination with the control mode of the motor (direct torque control or vector control strategy).

[0018] As an alternative implementation, the line information includes the maximum curve, the maximum slope and the longest tunnel.

[0019] As an alternative implementation, the traction motor power is calculated according to the line information, the temperature is derived, and a comparison is made according to the corresponding threshold value, and if the temperature is not exceeded, it is considered to meet the operating requirements.

[0020] As an alternative implementation, the process of calculating the motor loss includes calculating the stator tooth loss, stator yoke loss, stator iron loss, stator copper loss, rotor copper loss and traction motor stray loss respectively, and calculating the total loss according to the above losses.

[0021] As an alternative implementation, the specific process of determining whether the motor temperature rise theoretical value exceeds the temperature rise threshold value range includes making a preliminary judgment according to the converted traction motor temperature rise and the traction motor temperature rise fault prediction and health management model.

[0022] A wheel diameter difference traction motor temperature rise warning system, comprising:

[0023] The wheel diameter difference determination module is configured to determine whether the wheel diameter difference meets the requirements of the corresponding position according to the actual measured value of the wheel diameter difference.

[0024] The traction motor power calculation module is configured to calculate the power of the traction motor in combination with the traction motor characteristic parameters and the inverter parameters under normal operation conditions.

[0025] The threshold interval determination module is configured to fit the temperature rise threshold interval according to the line information.

[0026] The traction motor temperature rise calculation module is configured to calculate the motor loss and convert the motor loss into the traction motor temperature rise.

[0027] The early warning optimization module is configured to determine whether the motor temperature rise theoretical value exceeds the temperature rise threshold interval, and if so, to issue a warning and make a grinding repair optimization request.

[0028] As an optional implementation, it further includes a parameter acquisition module, including a traction control unit, an inverter module and a plurality of acquisition modules, the traction control unit is used to control each acquisition module to collect the speed of each parallel motor and the sum of the currents of each parallel motor.

[0029] An urban rail vehicle includes the above system or is optimized by the above method.

[0030] Compared with the prior art, the present disclosure has the following beneficial effects:

[0031] The present disclosure has good feasibility and accuracy for the wheel diameter differential vehicle set traction motor temperature rise warning, and can guide the rail vehicle to perform grinding repair and optimization.

[0032] The method of the present disclosure considers the influence of different line conditions, different types of motors and different wheel diameter differences on operation reliability, has a wide range of applications, and can effectively avoid some actual problems caused by temperature rise.

[0033] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings accompanying the specification of the present disclosure serve to provide a further understanding of the present disclosure, and the schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0035] Figure 1 is the parameter acquisition module of the present disclosure;

[0036] Figure 2 is the flowchart of the present disclosure. DETAILED DESCRIPTION

[0037] The present disclosure is further described below in combination with the drawings and embodiments.

[0038] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in connection with the disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure belongs.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0040] Embodiment one:

[0041] As shown in Figure 2 A wheel diameter difference traction motor temperature rise early warning method includes the following steps:

[0042] (1) According to the actual measurement value of the wheel diameter difference, it is judged whether the wheel diameter difference meets the requirements of the corresponding position;

[0043] Specifically, it is determined whether it meets the operation parameter requirements of the shaft, frame, vehicle and vehicle shop, and if it does not meet the requirements, an optimization request for turning and repairing is directly proposed.

[0044] The operation parameter requirements in this embodiment can be determined according to specific circumstances, for example: the turning and repairing requirements of the motor car of the Fuxing number standard motor train unit, the wheel diameter difference in the same frame is not more than 2mm, and the same compartment is not more than 4mm. As long as the actual wheel diameter is less than the threshold value, it is considered to meet the operation requirements of the motor train unit. Otherwise, the corresponding wheel diameter difference over-limit early warning is reported.

[0045] (2) If the requirements are met, the power of the traction motor is calculated in combination with the motor characteristic parameters and the inverter parameters under normal operation conditions;

[0046] In this embodiment, when the motor train unit is normally operated, the simulation platform collects motor characteristic parameters (speed, current, torque, voltage, efficiency, etc.), traction inverter parameters (traction characteristic curve, current, voltage, efficiency, etc.) and motor train test wheel diameter, and inputs them as power calculation inputs.

[0047] As an example, this embodiment can adopt a parallel power supply mode of 4 traction motors, and the motor power supply voltage amplitude and frequency are the same. The traction control unit TCU (TCU) control module controls each terminal acquisition module to obtain the speed of each parallel motor (taking the average value) and the sum of the current of each parallel motor (sending to the control model to obtain the average value). The traction inverter under the vehicle control mode controls each motor (the speed target set value is consistent) as an equivalent average motor.

[0048] The traction converter sets each motor as an equivalent average motor to control, and the relationship between torque, power, flux linkage and slip is obtained according to the control mode of the motor (direct torque control or vector control strategy).

[0049] The traction converter adopts the car control mode, and the speed of the motor car set vt is forced to be consistent with the linear speed of each wheel shaft. Assuming that D1>D2>D3>D4, the converted motor speed has f1<f2<f3<f4, the average frequency of each motor obtained by the inverter input is fav, and the inverter output frequency is fs at this time. The motor 1 slip fslip1=fs-f1; the motor 2 slip fslip2=fs-f2, the motor 3 slip fslip2=fs-f3, and the motor 4 slip fslip1=fs-f4. The motor power (torque) is positively correlated with the slip, so the motor power will also have differences. The specific influence relationship under traction and braking is shown in the following table:

[0050]

[0051]

[0052] The above parameters are the normal case as the temperature comparison analysis reference.

[0053] (3) According to the line information (including the maximum bend, the maximum slope, the longest tunnel, etc.), the temperature rise threshold interval is fitted; the motor loss is calculated, and the motor loss is converted into the temperature rise of the traction motor;

[0054] When calculating the loss, the stator tooth loss P fet :

[0055]

[0056] P fet is the stator tooth loss, kW;

[0057] k1 is the iron loss correction coefficient, and k1=3;

[0058] p 50 / 100 is the loss coefficient of DW465-50 material silicon steel sheet under 1T and 50Hz, p 50 / 100 =2.0W / m 2 ;

[0059] B t1 is the magnetic flux density of the stator tooth, T;

[0060] f frequency, Hz;

[0061] G i weight of the tooth, kg;

[0062] Stator yoke loss P fej :

[0063]

[0064] Stator iron loss P fe :

[0065] P fe = P fet + P fej

[0066] Stator copper loss P cu1 :

[0067]

[0068] Rotor copper loss P cu2 :

[0069]

[0070] Traction motor mechanical loss P fw :

[0071]

[0072] Traction motor stray loss P s :

[0073] P s = 0.005 x P N

[0074] Total loss:

[0075] P ξ = P cu1 + P cu2 + P fw + P s + P fe

[0076]

[0077] (4) Determine whether the motor temperature rise theoretical value exceeds the temperature rise threshold interval, if it exceeds, pre-warning and propose a grinding repair optimization request.

[0078] In the present embodiment, according to the line information (ramp slope, ramp length, vehicle speed, motor body parameters, etc.), the traction motor power is calculated, and the temperature is derived, for example, as an example, the traction motor stator temperature early warning value is set to 180℃, the transmission end temperature early warning value is set to 120℃, and the non-transmission end temperature early warning value is set to 120℃, corresponding comparison is carried out, and the temperature is not exceeded. Limit is considered to meet the operation requirements.

[0079] A wheel diameter difference traction motor temperature rise early warning system comprises:

[0080] A wheel diameter difference judgment module is configured to judge whether the wheel diameter difference meets the requirements of the corresponding position according to the wheel diameter difference actual measurement value;

[0081] A traction motor power calculation module is configured to calculate the power of the traction motor in combination with the traction motor characteristic parameters and the inverter parameters under normal operation conditions;

[0082] A threshold interval determination module is configured to fit the temperature rise threshold interval according to the line information;

[0083] A traction motor temperature rise calculation module is configured to calculate the motor loss and convert the motor loss into the traction motor temperature rise;

[0084] An early warning optimization module is configured to judge whether the motor temperature rise theoretical value at this time exceeds the temperature rise threshold interval, and if so, to issue an early warning and a grinding repair optimization request.

[0085] In the embodiment, as shown in Figure 1 It further comprises a parameter acquisition module, including a traction control unit, an inverter module and a plurality of acquisition modules, the traction control unit being used to control the acquisition modules to acquire the speed of each parallel motor and the sum of the currents of each parallel motor.

[0086] Although the specific embodiments of the present disclosure are described above in combination with the drawings, it is not a limitation on the protection scope of the present disclosure, and those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present disclosure without creative labor are still within the protection scope of the present disclosure.

Claims

1. A wheel radius difference traction motor temperature rise early warning method, characterized by: The method comprises the following steps: According to the actual measurement value of the wheel diameter difference, it is judged whether the wheel diameter difference meets the requirements of the corresponding position; If the requirements are met, the power of the traction motor is calculated in combination with the motor characteristic parameters and the converter parameters under normal operating conditions; In the process of obtaining the motor characteristic parameters under normal operating conditions, it is set that each traction motor adopts parallel power supply mode under normal operating conditions, the supply voltage amplitude and frequency of each motor are the same, and the speed of each traction motor and the sum of the currents of each traction motor are collected; The average speed of each traction motor is calculated as the traction motor speed, i.e. the rotational speed, and the correlation between the rotational speed and the slip ratio under the corresponding operating conditions is used to determine the slip ratio and the motor power. According to the line information, the temperature rise threshold interval is fitted out; The line information includes the maximum curve, the maximum slope, the longest tunnel, the vehicle speed and the motor body parameters; The motor loss is calculated, and the motor loss is converted into the traction motor temperature rise; It is judged whether the motor temperature rise theoretical value at this time exceeds the temperature rise threshold interval, and if it exceeds, a warning is given and a turning and repairing optimization request is proposed.

2. The wheel radius difference traction motor temperature rise early warning method of claim 1, characterized in that: The process of judging whether the wheel diameter difference meets the requirements of the corresponding position specifically includes: according to the actual measurement value of the wheel diameter difference, it is determined whether it meets the parameter requirements of the shaft, the frame, the vehicle and the vehicle shop, if yes, it is determined that the requirements are met, and if not, a turning and repairing optimization request is directly proposed.

3. The wheel radius difference traction motor temperature rise early warning method of claim 1, characterized in that: In the process of obtaining the traction converter characteristic parameters under normal operating conditions, it is set that the traction converter controls each motor as an equivalent average motor, and the relationship between the corresponding characteristic parameters is determined in combination with the control mode of the motor.

4. The wheel radius difference traction motor temperature rise early warning method of claim 1, characterized in that: The process of calculating the motor loss includes respectively calculating the stator tooth loss, the stator yoke loss, the stator iron loss, the stator copper loss, the rotor copper loss and the traction motor stray loss, and calculating the total loss according to the above losses.

5. The wheel radius difference traction motor temperature rise early warning method of claim 1, characterized in that: The specific process of judging whether the motor temperature rise theoretical value at this time exceeds the temperature rise threshold interval includes comparing the converted traction motor temperature rise with the corresponding threshold, and the temperature not exceeding the limit is considered to meet the operating requirements.

6. A wheel radius difference traction motor temperature rise early warning system, characterized in that: It comprises: A wheel diameter difference judgment module configured to judge whether the wheel diameter difference meets the requirements of the corresponding position according to the actual measurement value of the wheel diameter difference; A traction motor power calculation module configured to calculate the power of the traction motor in combination with the traction motor characteristic parameters and the converter parameters under normal operating conditions; A threshold interval determination module configured to fit out the temperature rise threshold interval according to the line information; The line information includes the maximum curve, the maximum slope, the longest tunnel, the vehicle speed and the motor body parameters; A traction motor temperature rise calculation module configured to calculate the motor loss and convert the motor loss into the traction motor temperature rise; A warning and optimization module configured to judge whether the motor temperature rise theoretical value at this time exceeds the temperature rise threshold interval, and if it exceeds, a warning is given and a turning and repairing optimization request is proposed. It further comprises a parameter acquisition module, including a traction control unit, an inverter module and a plurality of acquisition modules, the traction control unit is used to control each acquisition module to collect the speed of each parallel motor and the sum of the currents of each parallel motor.

7. A wheel radius difference traction motor temperature rise early warning system according to claim 6, characterized in that: ​ 8. A rail vehicle characterized by: including the system of claim 6 or 7 or the method of any of claims 1-5.

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