Servo motor system test solution

With the rapid development of servo motor technology, CNC machine tools, industrial robots, and automated production equipment have begun to use servo motors as key components of motion control. Naturally, the performance requirements of servo motors are becoming higher and higher, especially their dynamic characteristics. At this time, the traditional dynamometer has been unable to achieve relevant tests, so there is an urgent need in the industry to provide a complete solution for high-performance servo motor dynamics and controller control performance testing.

Picture 1

The current equipment for measuring and evaluating the performance of the motor is mainly a dynamometer. The original dynamometer only measures the input voltage, current, output speed and torque of the motor, and calculates the input and output power and efficiency of the motor. However, with the rapid development of the motor industry, more and more motor test projects, the function of the dynamometer is also enriched. Even so, the dynamic test of the motor is still a technical problem in the industry.

Firstly, the dynamic test includes a step response test to analyze the response time of the speed/torque control. When the motor load changes stepwise and changes the output speed/torque of the motor, the time taken by the motor driver to adjust the motor back to normal operation is used. Length, usually imported high-performance servo motor speed step response time should be able to reach us level, torque step response adjustment time should also reach ms level, with the Yaskawa servo motor SGM7A-10AFA6C this model, its speed step The response time is up to 790ms and the torque step response adjustment time is up to 28ms (the above data is provided according to the test results of the remote electronic MPT1000-F motor transient control and test system).

Picture 2

Secondly, the speed fluctuation test is to investigate the fluctuation of the motor speed when the torque suddenly changes in the speed control mode; and the overspeed test to check the installation quality of the motor, the mechanical strength of the part of the experimental rotor subjected to the release force, and the bearing at overspeed. Mechanical strength.

Picture 3

In the test and loading process, the traditional dynamometer generally uses the adjustment PID to change the load size. At the same time, the industrial control machine is used for feedback control judgment and display. Due to the delay of the communication bus, the PID adjustment speed is slow, and the loading mode can only achieve one by one. Load it as shown below:

Picture 4

As the loading speed can not be increased, it is even more impossible to load any load. At the same time, due to the low sampling rate and the torque sampling rate of the instrument itself, the traditional dynamometer can not test the dynamic characteristics of the servo system.

Traditional integration vendors use a simple instrument combination to build a test platform. Due to the lack of in-depth understanding of the measurement principle and research and development experience, it is difficult to provide a complete functional customization service according to customer needs. The problems revealed by this are becoming more and more serious. For example, the load and test response are slow, and can only be applied to the steady-state test requirements. Supporting the three-channel electrical parameter measurement and analysis, the systemic joint test of the motor driver and the motor cannot be realized.

With deep understanding and long-term accumulation in the field of power analysis and motor measurement, Zhiyuan Electronics breaks through the bottleneck of motor dynamic testing, adopts the original free-loading engine and integrates the design concept of the instrument, and uses a separate hardware PID controller to make negative feedback control judgment. Improve the PID adjustment speed, launch the epoch-making MPT hybrid motor test system, and meet the industry's steady-state and dynamic measurement requirements for the motor and its control system, leading the motor experiment into the field of dynamic measurement.

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