Sichuan Chengbang Haoran Measurement and Control Technology Co., Ltd.
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AT4000—Cogging torque test system

Case Presentation

  AT4000—Cogging Torque Test System—Product Background


  Most of the new energy vehicles use permanent magnet synchronous motors as the driving source. The cogging torque will cause the motor to produce vibration and noise, and the rotation speed will fluctuate, so that the motor cannot run smoothly and affect the performance of the motor. In variable speed drive, when the torque ripple frequency is consistent with the mechanical resonance frequency of the stator or rotor, the vibration and noise generated by the cogging torque will be amplified. The existence of cogging torque also affects the low-speed performance of the motor in the speed control system and the high-precision positioning in the position control system. The cogging torque test has a clear definition in the national standard GBT/30549-2014. Bench test cogging torque test to test and verify the characteristics of the motor.


Bench picture


  Reference standard:

  GBT 30549-2014 permanent magnet AC servo motor general technical conditions

  GB 755-2008 Rotating motor rating and performance

  GB 50150 Electrical equipment installation engineering electrical equipment handover test standard

  GB/T 50055-93 Code for Power Distribution Design of General Electric Equipment

  Mechanical manufacturing system according to GB9061-85

  The electrical system is in accordance with GB5226-85

  AT4000—Cogging torque test system—Topological structure


  AT4000—The cogging torque test system adopts a modular and integrated design, the operating part is ergonomically designed, and can complete manual/automatic mode control. It consists of three parts: mechanical system, electrical system, and system software.

  Mechanical system: Integral bench + tested support and other equipment.

  Electrical system: drive motor, sensor (angle, torque) real-time data acquisition system, data acquisition, alarm system and other equipment.

  System software: The upper computer test software is divided into data acquisition communication module, data acquisition setting module, data real-time exchange control module, and data processing module according to the system. The upper computer completes the functions of test control, data analysis and display, data recording and export according to the test items.

  AT4000—Cogging Torque Test System—System Function

  Basic range and accuracy:

  Basic parameters:

  ●Angle range: ±360°

  ●Torque range: ±10N.m

  Test items:

  ●Cogging torque test

  AT4000—Cogging Torque Test System—Main Features

  01 Functional modularity

  All the benches are built using functional modularization, and the modular combination is integrated into one test system

  02 Advanced measurement methods

  Adopt advanced real-time measurement and control system, including input mechanical power test, speed and torque test, etc. The torque and speed sampling adopts high sampling rate and high-precision angle measurement to meet the high-precision and fast response requirements of the test system, and provide transient data and characteristic values Data, it is convenient for the software to conduct a comprehensive analysis of the test process data later.

  03 Servo motor drive

  The servo motor is adopted as the drive system, which changes the traditional drive mode, improves the dynamic response of the system's speed, and can realize the drive torque of any drive curve and the test of the angle working condition.

  04Humanized design

  The dynamometer adopts professional tooling and docking, and is convenient for loading and unloading and adjustment of coaxiality. It can be adapted to the installation of any vehicle type. The system operation adopts the combination mode of vertical cabinet + multiple display screens.

  05Customized testing software

  The test system test software developed by the Sichuan Chengbang Software R&D team, according to the requirements of the national standard, classifies the software interface and process, reduces repeated tests, and greatly improves the work efficiency of testers. It also has functions such as real-time curve drawing, transient value capture, trend curve drawing and analysis, multi-parameter combination display, report export and other functions.

  AT4000—Cogging Torque Test System—Main Application

  Permanent magnet synchronous motor test

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