A shaft end durability test method and device for a new energy electric drive system

Abstract

The invention discloses a shaft end durability test method and device for a new energy electric drive system. Aiming at the problem that the current experiments on new energy electric drive systems have not verified the tolerance of rotating parts and parts in contact with or matching with the motor when the motor rotor axially moves and radially runs out, and lack reliability, the electric drive system to be tested is installed on a test bench, and accelerated or decelerated according to a preset torque. During the operation, the axial movement displacement of the motor is collected by an axial laser sensor, and the radial runout displacement of the motor is collected by a radial laser sensor. The collected data can be processed to obtain the axial movement displacement spectrum and radial runout displacement spectrum for acceleration experiments. The acceleration experiment is carried out on a vibration platform to detect the durability of the electric drive system to be tested, and the durability of each part in contact with the motor rotor shaft end is verified, thereby increasing the safety and reliability of the electric drive system.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive system testing, and in particular relates to a shaft end durability test method and device for a new energy electric drive system. Background Art

[0002] The new energy electric drive system is the core component of the whole vehicle. Furthermore, the motor is the core component of the electric drive system. During the operation of the motor, due to the existence of rotor dynamic balance error, self-alignment adjustment of the magnetic center line of the motor stator and rotor, uneven air gap between the stator and rotor, etc., the rotor will produce different degrees of displacement in the axial and radial directions. The axial relative displacement is the axial play of the rotor shaft, and the radial relative displacement is the radial runout of the rotor shaft, which manifests as noise, vibration and other adverse phenomena of the motor.

[0003] In the current verification test project, the vibration test only simulates the impact of vibration on the electric drive system under the actual operating environment of the vehicle, and verifies the ability of the electric drive system to resist defects under random vibration and sinusoidal vibration excitation. The tolerance of rotating parts and parts in contact or matching with them caused by axial movement and radial runout has not been verified, and this impact has always existed during the operation of the actual vehicle. Therefore, it is urgent to design an experiment to verify the durability of the electric drive system under axial movement and radial runout, so as to increase the operating reliability of the electric drive system. Summary of the invention

[0004] The purpose of the present invention is to provide a shaft end durability test method and device for a new energy electric drive system, which can verify the durability of various components in contact with the motor rotor shaft end and increase the safety and reliability of the electric drive system.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A shaft end durability test method for a new energy electric drive system, comprising:

[0007] Connect the electric drive system under test to the test bench, and accelerate or decelerate the electric drive system under test according to the preset torque;

[0008] An axial laser sensor is fixedly mounted on the electric drive system under test to collect the axial displacement of the motor of the electric drive system under test and obtain an axial displacement spectrum;

[0009] A radial laser sensor is fixedly mounted on the electric drive system to collect radial runout displacement of the motor of the electric drive system to obtain a radial runout displacement spectrum;

[0010] The electric drive system under test is fixed on a vibration platform, and the motor rotor shaft of the electric drive system under test is accelerated according to the axial play displacement spectrum or radial runout displacement spectrum to detect the shaft end durability of the electric drive system under test.

[0011] According to an embodiment of the present invention, the vibration platform is replaced with a hydraulic excitation test bench to perform a shaft end durability test on the electric drive system under test.

[0012] According to one embodiment of the present invention, the electric drive system under test includes a motor, a motor controller and a gearbox, the axial laser sensor is fixedly mounted on the motor or the gearbox along the axial direction of the motor rotor; the radial laser sensor is fixedly mounted on the motor or the gearbox along the radial direction of the motor.

[0013] According to an embodiment of the present invention, the axial laser sensor or the radial laser sensor is fixedly connected to the motor via a tooling.

[0014] According to an embodiment of the present invention, the axial laser sensor or the radial laser sensor is bolted to the motor.

[0015] According to an embodiment of the present invention, the test bench is a single-motor bench or a dual-motor bench.

[0016] According to an embodiment of the present invention, the preset torque is +162Nm, +45Nm, -55Nm or -132Nm.

[0017] A shaft end durability test device for a new energy electric drive system, comprising:

[0018] The test bench is connected to the electric drive system under test, and accelerates or decelerates the electric drive system under test according to a preset torque;

[0019] The axial laser sensor is fixedly mounted on the electric drive system under test, collects the axial displacement of the motor of the electric drive system under test, and obtains the axial displacement spectrum;

[0020] The radial laser sensor is fixedly mounted on the electric drive system under test, collects the radial runout displacement of the motor of the electric drive system under test, and obtains the radial runout displacement spectrum;

[0021] The vibration platform is used to accelerate the motor rotor shaft of the tested electric drive system according to the axial play displacement spectrum or the radial runout displacement spectrum, so as to detect the durability of the shaft end of the tested electric drive system.

[0022] According to an embodiment of the present invention, the vibration platform is replaced by a hydraulic excitation test platform.

[0023] According to one embodiment of the present invention, the electric drive system under test includes a motor, a motor controller and a gearbox, the axial laser sensor is fixedly mounted on the motor or the gearbox along the axial direction of the motor rotor; the radial laser sensor is fixedly mounted on the motor or the gearbox along the radial direction of the motor.

[0024] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0025] The shaft end durability test method of the new energy electric drive system in one embodiment of the present invention is aimed at the problem that the current experiments on the new energy electric drive system have not verified the tolerance of the rotating parts and the components in contact or cooperation with the motor when the motor rotor axial movement and radial runout occur, and lack of reliability. The electric drive system to be tested is installed on a test bench, accelerated or decelerated according to a preset torque, and the axial movement displacement of the motor is collected by an axial laser sensor, and the radial runout displacement of the motor is collected by a radial laser sensor during operation. The collected data can be processed to obtain the axial movement displacement spectrum and radial runout displacement spectrum for acceleration experiments, and the acceleration experiment is carried out on a vibration platform to detect the durability of the electric drive system to be tested, and the durability of each component in contact with the motor rotor shaft end is verified, thereby increasing the safety and reliability of the shaft end of the electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a shaft end durability test method for a new energy electric drive system in one embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a shaft end durability test device for a new energy electric drive system in one embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a simulation device of an electric drive system in an embodiment of the present invention;

[0029] Figure 4 is an axial displacement map collected by a laser sensor in one embodiment of the present invention;

[0030] Figure 5 This is a radial displacement map collected by a laser sensor in one embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1: Test bench; 2: Electric drive system under test; 201: Motor; 2011: Motor rotor shaft; 202: Motor controller; 203: Gearbox; 3: Tooling; 4: Axial laser sensor; 5: Radial laser sensor. DETAILED DESCRIPTION

[0033] The following is a further detailed description of a shaft end durability test method and device for a new energy electric drive system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0034] Please see Figure 1 This embodiment provides a shaft end durability test method for a new energy electric drive system, including:

[0035] S1: Connect the electric drive system under test to the test bench, and accelerate or decelerate the electric drive system under test according to the preset torque;

[0036] S2: The axial laser sensor is fixedly mounted on the electric drive system under test to collect the axial displacement of the motor of the electric drive system under test and obtain the axial displacement spectrum;

[0037] S3: fixing a radial laser sensor on the electric drive system under test to collect radial runout displacement of the motor of the electric drive system under test and obtain a radial runout displacement spectrum;

[0038] S4: The electric drive system under test is fixed on a vibration platform, and the motor rotor shaft of the electric drive system under test is accelerated according to the axial runout displacement spectrum or the radial runout displacement spectrum to detect the durability of the shaft end of the electric drive system under test.

[0039] The shaft end durability test method of the new energy electric drive system depends on the implementation of specific devices. The shaft end durability test device of the new energy electric drive system composed of various specific devices is first introduced below.

[0040] Please see Figure 2 and Figure 3 This embodiment provides a shaft end durability test device for a new energy electric drive system, including:

[0041] The test bench 1 is connected to the electric drive system 2 under test, and accelerates or decelerates the electric drive system 2 under test according to a preset torque.

[0042] The axial laser sensor 4 is fixedly mounted on the electric drive system 2 under test, collects the axial displacement of the motor 201 of the electric drive system 2 under test, and obtains the axial displacement spectrum;

[0043] The radial laser sensor 5 is fixedly mounted on the electric drive system 2 under test, collects the radial runout displacement of the motor 201 of the electric drive system 2 under test, and obtains the radial runout displacement spectrum;

[0044] The vibration platform is used to accelerate the motor rotor shaft 2011 of the electric drive system 2 under test according to the axial runout displacement spectrum or the radial runout displacement spectrum, so as to detect the durability of the electric drive system 2 under test.

[0045] Specifically, the test bench 1 can be as follows Figure 2 The dual-motor test bench shown can also be a single-motor test bench. The test bench 1 mainly includes a base for supporting, a connecting plate and a connecting shaft connected to the electric drive system 2 under test. When the electric drive system 2 under test is installed on the test bench 1 with the tooling, the test bench 1 can accelerate or decelerate the electric drive system 2 under test according to a given or preset torque. According to the characteristics of the electric drive system itself, the given or preset torque can be +162Nm, +45Nm, -55Nm or -132Nm.

[0046] like Figure 3 As shown, the electric drive system 2 under test in this embodiment includes a motor 201, a motor controller 202 and a gear box 203. Usually, during the operation of the motor 201, due to the existence of the dynamic balance error of the rotor, the self-alignment adjustment of the magnetic center line of the motor stator and rotor, and the uneven air gap between the stator and rotor, the motor rotor will be displaced to varying degrees in both the axial and radial directions. Among them, the axial relative displacement is the axial movement of the motor rotor shaft 2011, and the radial relative displacement is the radial runout of the motor rotor shaft, which is specifically manifested as the noise, vibration and other undesirable phenomena of the motor 201. Therefore, in the reliability test of the electric drive system, it is necessary to conduct a durability test of the electric drive system under the conditions of axial movement and radial runout. In this durability test, it is necessary to collect the axial movement displacement and radial runout displacement of the motor rotor shaft 2011 during operation, and this embodiment uses a laser sensor to complete the collection of the above displacement.

[0047] In order to distinguish, in this embodiment, the laser sensor for collecting the axial displacement of the motor rotor shaft 2011 is referred to as an axial laser sensor. Figure 2 and 3 The axial laser sensor 4 shown in the figure can be arranged on the motor 201 or the gear box 203 along the axial direction of the motor rotor shaft 2011, and can be fixedly connected to the motor 201, the gear box 203 and other components through the tooling 3 (such as connecting with bolts on the motor 201, the gear box 203 and other components), or can be glued to the motor 201, the gear box 203 and other components.

[0048] In this embodiment, the laser sensor for collecting the radial runout displacement of the motor rotor shaft 2011 is referred to as a radial laser sensor. Figure 2 and 3The radial laser sensor 5 shown in the figure can be arranged on the motor 201 or the gear box 203 along the radial direction of the motor rotor shaft 2011, and can be fixedly connected to the motor 201, the gear box 203 and other components through the tooling 3 (such as connecting with bolts on the motor 201, the gear box 203 and other components), or can be glued to the motor 201, the gear box 203 and other components.

[0049] The above-mentioned tooling 3 refers to process equipment required to be used in the experimental process of the electric drive system, such as workstation tools, fixtures, etc.

[0050] The following specifically describes the process of the shaft end durability test method of the new energy electric drive system of the present invention:

[0051] After the electric drive system 2 under test is installed on the test bench 1, the torque is set according to the characteristics of the electric drive system itself, so that the electric drive system 2 under test (mainly the motor 201) is accelerated or decelerated according to the torque. During the operation, the axial laser sensor 4 collects the axial displacement of the motor rotor shaft 2011, such as Figure 4 The radial laser sensor 5 collects the radial runout displacement of the motor rotor shaft 2011, as shown in FIG. Figure 5 As shown. The collected axial displacement data is processed (e.g., multiplied by a certain multiple) to obtain an axial displacement spectrum; the collected radial displacement data is processed (e.g., multiplied by a certain multiple) to obtain a radial displacement spectrum. The axial displacement spectrum and radial displacement spectrum are used in the subsequent durability test experiment of the electric drive system.

[0052] The durability test experiment of the electric drive system can be carried out on a vibration platform or a hydraulic excitation test bench. The electric drive system 2 to be tested is fixed on the vibration platform so that it does not move with the vibration platform, and the motor shaft end is equipped with a certain tooling so that the motor 201 can be accelerated with the vibration platform according to a given displacement spectrum. Alternatively, the electric drive system 2 to be tested is directly fixed on a hydraulic excitation test bench (such as an MTS excitation test bench) so that the motor shaft end of the electric drive system 2 to be tested is subjected to shaft end displacement excitation according to a given displacement spectrum.

[0053] Specifically, according to the maximum value of the collected radial runout data, such as 0.3mm, a tooling is used to continuously apply a radial displacement of 0.3mm to the rotating shaft of the electric drive system 2 under test, during which the electric drive system 2 under test can be operated at a low speed, thereby achieving the purpose of verifying the durability of the entire circumference of the components in contact with the motor shaft under radial runout acceleration.

[0054] This embodiment adopts the shaft end durability test method and device of the new energy electric drive system, and after adding the simulation of the durability test, the reliability of the parts connected to the motor shaft can be verified early, such as the reliability of the rotor core connected to the shaft by the motor, and the reliability of the shaft circumferential end parts such as bearings.

[0055] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A shaft end durability test method for a new energy electric drive system, characterized in that: include: Connect the electric drive system under test to the test bench, and accelerate or decelerate the electric drive system under test according to the preset torque; An axial laser sensor is fixedly mounted on the electric drive system under test to collect the axial displacement of the motor of the electric drive system under test and obtain an axial displacement spectrum; A radial laser sensor is fixedly mounted on the electric drive system to collect radial runout displacement of the motor of the electric drive system to obtain a radial runout displacement spectrum; The electric drive system to be tested is fixed on a vibration platform, and the motor rotor shaft of the electric drive system to be tested is accelerated according to the axial displacement spectrum or radial displacement spectrum to detect the durability of the shaft end of the electric drive system to be tested; Among them, the electric drive system under test includes a motor, a motor controller and a gearbox, the axial laser sensor is fixedly mounted on the motor or the gearbox along the axial direction of the motor rotor; the radial laser sensor is fixedly mounted on the motor or the gearbox along the radial direction of the motor.

2. The shaft end durability test method of the new energy electric drive system according to claim 1, characterized in that: The axial laser sensor or the radial laser sensor is fixedly connected to the motor via a tooling.

3. The shaft end durability test method of the new energy electric drive system according to claim 1, characterized in that: The axial laser sensor or the radial laser sensor is bolted to the motor.

4. The shaft end durability test method of the new energy electric drive system according to any one of claims 1 to 3, characterized in that: The test bench is a single-motor bench or a dual-motor bench.

5. The shaft end durability test method of the new energy electric drive system according to any one of claims 1 to 3, characterized in that: The preset torque is +162Nm, +45Nm, -55Nm or -132Nm.

6. The shaft end durability test method of the new energy electric drive system according to claim 1, characterized in that: The vibration platform is replaced with a hydraulic excitation test bench to perform a shaft end durability test on the electric drive system under test.

7. A shaft end durability test device for a new energy electric drive system, characterized in that: include: The test bench is connected to the electric drive system under test, and accelerates or decelerates the electric drive system under test according to a preset torque; The axial laser sensor is fixedly mounted on the electric drive system under test, collects the axial displacement of the motor of the electric drive system under test, and obtains the axial displacement spectrum; The radial laser sensor is fixedly mounted on the electric drive system under test, collects the radial runout displacement of the motor of the electric drive system under test, and obtains the radial runout displacement spectrum; A vibration platform, used to accelerate the motor rotor shaft of the electric drive system under test according to the axial runout displacement spectrum or the radial runout displacement spectrum, so as to detect the durability of the shaft end of the electric drive system under test; Wherein, the electric drive system under test includes a motor, a motor controller and a gearbox, the axial laser sensor is fixedly mounted on the motor or the gearbox along the axial direction of the motor rotor; the radial laser sensor is fixedly mounted on the motor or the gearbox along the radial direction of the motor; The vibration platform is replaced by a hydraulic excitation test bench.

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