Traditional integration vendors mainly implement test platform construction through a simple instrument combination. Due to the lack of in-depth understanding and research and development experience of measurement principles, it is difficult to provide perfect functional customization services according to customer needs. With deep understanding and long-term accumulation in power analysis and motor measurement, Zhiyuan Electronics has launched the epoch-making MPT intelligent motor test and analysis system with control concept, analysis capability and international standard support. In three aspects, the comprehensive innovation of the motor test system has been realized, which is used to meet the deep requirements of different industries for motor testing, and to realize functional customization services that are more professional and more suitable for users.
Next, let's explore a detail indicator that is easy to ignore in the motor test platform: control error.
Control error of traditional motor test platform
The traditional motor test platform only provides open-loop control of the motor speed and torque, ignoring the error introduced by the clamp and the motor load, and cannot provide accurate motor measurement results for the user.
Figure 1 Traditional motor test platform architecture
The cause of the error
The reasons for the speed and torque error of the motor test system (dynamometer) can be summarized as the following three points:
1. In the motor drag system, when the torque output from the motor is transmitted to the sensor or load through the clamp, a small portion is lost as friction torque. Therefore, in order to normally drag the load, the motor will output a torque slightly larger than the load, resulting in an error between the torque measurement value and the set value;
2. There is a control error in the motor load itself, and the control signal does not exactly match the actual load torque;
3. Due to the functional relationship between speed and torque, the above two errors also have an effect on the speed.
Figure 2 Reasons for the error
How to ensure high control accuracy of the motor test platform?
Zhiyuan Electronic MPT motor test system adopts advanced intelligent PID control architecture. The professional motor test software MotorTest, motor running module and high-precision power analyzer form a closed-loop feedback system. The motor speed and torque control accuracy is up to 0.5%. Users provide the most accurate motor performance analysis.
During the test, the high-precision power analyzer measures the speed and torque of the motor in real time, and uploads it to the MotorTest software to compare the test data with the set value. If there is a deviation between the two, the system control module rotates the motor. \ The torque is negatively adjusted, and then the sampling comparison is performed again until the test data and the set value are within the accuracy range, and then the system test and analysis are started, and the motor performance is truly presented.
Figure 3 MPT motor test system architecture diagram
Measured case
Take the motor characteristic curve test as an example: when the user sets the torque to 10~100N·m, the deviation of the traditional motor test platform is as high as 5%, and the torque control error of the MPT motor test system is as low as 0.36%, which satisfies the user's motor. The need for precise analysis of features.
Figure 4 measured case
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