The core "synchronization" of motor transient testing
When it comes to motor testing, people often think of how to ensure the accuracy of the test, using high-precision measuring instruments, sensors and so on. However, with the development of the motor industry, especially the motor control technology such as vector inverter control, the testers need to analyze the transient characteristics of the motor. At this time, we must pay attention to a new test point - how to ensure the test Synchronization.
Why pay attention to the synchronization of the test?
The so-called synchronization, that is, in the motor test to ensure that each measurement parameter is collected at the same time point, mainly reflected in the synchronous acquisition of parameters such as speed, position, torque, voltage, current, temperature, vibration.
The most significant effect of the test's synchronicity on the results is the efficiency measurement. If the mechanical parameters such as the rotational speed n and the torque T and the electrical parameters such as the voltage U and the current I are not collected at the same time point, the result calculated according to the efficiency calculation formula is also erroneous.
Motor efficiency calculation formula
In addition, for new energy vehicles, variable frequency motors, servo motors, etc. need to measure the motor driver and motor synchronously, analyze the performance of the motor, the synchronization of the test is also to analyze the real-time state of the motor controller efficiency and motor efficiency on the system The essential.
Why didn't you pay attention to the synchronization of the test in the past?
The motors tested in the past are mainly asynchronous motors. The testers only need to measure the parameters under their constant working conditions to obtain the output performance and draw the Tn curve or efficiency curve. Even if the collection of test process data is not at the same time, the test results are correct because the operating conditions (rotation speed, torque, etc.) of the motor are stable at different times.
Motor Tn curve
However, with the development of motor control technology, more and more motors need to measure their parameters when the operating conditions change. Such as speed regulation process, load step impact, etc., these transient measurements of the dynamic change process need to ensure real-time synchronization during data acquisition, and the obtained real-time data curve has reference value, so the industry also began to pay attention to the synchronization of measurement. stand up.
Motor speed response curve
How to ensure the synchronization of the test?
To ensure the synchronization of the test, especially to ensure the synchronization of the most critical parameters of the four motors of voltage, current, speed and torque, has always been a problem in the industry. The traditional solution is to use multiple instruments and sensors to collect, and finally take the bus for uploading. In the upper computer, the efficiency calculation will often introduce the ms-level delay. For the current motor control change response time of several ms, this The delay is unacceptable.
Traditional solution PK Zhiyuan electronic synchronous acquisition scheme
In response to this problem, Zhiyuan Electronics' MPT motor test system adopts a single acquisition terminal scheme, and simultaneously collects the voltage, current, speed, torque and angular position of the motor through a completely independent design of the new generation MDA power analyzer. Recording wave, directly calculate the efficiency on the acquisition terminal, the synchronization error delay is as low as 10 ns, which truly solves the synchronization problem of motor transient test or dynamic test.
(The manuscript is provided by ZLG Zhiyuan Electronics)
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