With the development of society, people's lives have become more and more colorful. Robotic pancakes, excavator shots, and so on, a series of things that we used to think hard about are clearly visible to us. The Huajiban car acrobatics show that will open in May is expected. Compared with racing cars, car acrobatics can be said to be different. When testing technology, it is more about "control ability", such as "car ballet". When multiple cars pass through roadblocks in the form of a curve, I have to marvel. This is really what the "car" shows. If one of the cars is driving too fast or too slow, it may reduce the overall visual effect. In serious cases, even a rear-end collision occurs, so precise control is particularly important. .
For the car, the speed and force control reflects the accuracy of the motor control. The motor control accuracy mainly includes the torque control accuracy and the speed control accuracy. The control accuracy test is described in detail in GBT 18488.2-2015 Motor Vehicle Drive Motor System Standard 7.3:
Speed ​​control accuracy test: For the drive motor system with speed control function, 10 different speed points are selected as the target value in the range of 10%-90% of the maximum working speed, and the drive motor control is set according to a certain speed target value. Or the upper computer software, the drive motor is directly rotated and accelerated from the static state, and reaches the steady state of the speed, and calculates the difference between the actual speed and the target speed, or the deviation between the actual speed and the target speed accounts for the percentage of the target speed. This value is The speed control accuracy corresponding to a speed target value.
Torque control accuracy test: For the drive motor system with torque control function, 10 different torque points are selected as the target value within the range of 10%-90% peak torque under the set speed condition, according to a certain A torque target is set to drive the motor controller or the upper computer software. The output of the drive motor is directly operated from zero torque to the steady state of the transfer polymerization speed. In this process, no adjustment should be made to the motor controller or the host computer software to calculate the actual torque. The difference between the value and the target torque value, or the percentage of the actual torque value and the target torque value to the target torque value. This value is the torque control accuracy corresponding to the torque target value under the specific speed condition.
The test of the speed and torque control accuracy can reflect the adjustment capability of the whole closed-loop system, and the control accuracy can reflect the efficiency of the drive, so that the user can improve the performance of the motor system. Zhiyuan Electronics has launched the MPT motor test system in strict accordance with the national standard test requirements. At the same time, through its unique MotorTest software, it can accurately test the speed and torque in the automatic mode.
During the test, the drive motor controller is set to the DC bus voltage as the rated voltage, and the drive motor system should be in the no-load, hot state, and electric working state. In the speed control accuracy test, the above experiment is performed for each set target value of the speed, and the maximum value of the speed control accuracy is selected as the speed control accuracy of the drive motor system. In the torque control accuracy test, the above experiment is performed for each set torque target value, and the error maximum value in the control accuracy is selected, that is, the torque control accuracy of the drive drive system under the specific speed condition, during the loading process. In the middle, the working speed of the drive motor will change, and the set speed can be set and controlled by the dynamometer.
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