Motor Test Details Cannot Be Ignored - Control Accuracy
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Next, we will discuss a more easily overlooked detail indicator in the motor test platform: control error.
Traditional motor test platform control error The traditional motor test platform can only provide open-loop control of the motor speed and torque, ignoring the error introduced by the fixture and motor load, and can not provide users with accurate motor measurement results. 
Causes of Error The causes of speed and torque error in the motor test system (dynamometer) can be summarized as follows:
1. In the motor drive system, when the torque output by the motor is transmitted to the sensor or load through the clamp, a small part will be lost as friction torque. Therefore, in order to drag the load normally, the motor will output a slightly larger torque than the load, causing an error between the torque measurement value and the set value.
2. The motor load itself has a control error, and the control signal does not exactly match the actual load torque;
3. Because there is a functional relationship between the speed and the torque, the above two errors also affect the speed. 
Figure 2 Reasons for the error
How to ensure the high precision of the motor test platform?
Zhiyuan Electronic MPT Motor Test System adopts advanced intelligent PID control architecture. It consists of three parts, a professional motor test software MotorTest, a motor operation module and a high-precision power analyzer. The motor speed and torque control accuracy is as high as 0.5%. The user provides the most accurate motor performance analysis.
In the test process, 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 the two are deviated, the system control module is responsible for the speed of the motor. \The torque is adjusted by negative feedback, and then the sample comparison is performed again until the test data and the set value are consistent within the accuracy range, and then the system test and analysis are started to truly show the motor performance. 
Figure 3 MPT motor test system architecture
The measured cases are based on the motor characteristic curve test. When the user sets the torque to 10~100N•m, the deviation of the traditional motor test platform is as high as 5%, while the torque control error of the MPT motor test system is as low as 0.36%, satisfying the user. The need for precise analysis of motor characteristics. 
Figure 4 measured cases