Electric vehicle motors are different from traditional industrial motors in that they have higher efficiency requirements in a wider speed range, which brings new testing methods for efficiency testing under new conditions.
In the past two years, the new energy vehicle industry has been booming, and more and more companies have joined the competition in this industry. As the core drive motors and drivers in electric vehicles, their performance directly determines whether the vehicle will compete. force. Since Faraday discovered the principle of electromagnetic induction, motors have developed for nearly two hundred years from their earliest prototypes. Motor
manufacturers can be found all over China.
However, ordinary motors often only work in steady state, and usually only the efficiency in steady state is required to be measured. As for the motors used in electric vehicles, we can easily imagine that in actual situations, they will frequently start, accelerate, brake, and the rotational speed changes drastically, and the working range almost covers the rotational speed range. Therefore, for electric vehicle motors, they must be required to operate within a wide range of operating speeds and rotation speeds. It has high efficiency within the torque range, so as to obtain a driving experience and energy consumption index.
The current national national standards for motor testing of electric vehicles are mainly derived from the testing standards and methods of traditional industrial motors, which are often insufficient for current motor testing. Some leading manufacturers in the industry will also develop their own testing methods.
The most mainstream of these methods is to simulate real motor operating conditions in the laboratory. Based on the real-time data recorded during the test, calculate the average efficiency and real-time dynamic efficiency of the motor and driver, and analyze and evaluate the performance of the motor and driver. performance.
Currently, there are three types of vehicle driving conditions in the world, namely C in the United States, Europe and C in Japan. As vehicles sold regionally, cars sold in various countries will undergo simulation tests for different working conditions. In our country, there are no standard working conditions for manufacturers to apply and test, so establishing typical working conditions is the first step for every motor manufacturer.
There are two most common methods of constructing typical working condition data. The first is to obtain the simulation model of vehicle driving resistance, adjust various parameters, and calculate the real-time torque of the motor. The second is to use the vehicle-mounted data acquisition system to Real-time data is recorded running on various road surfaces.
After obtaining the working condition data, use the road simulation test module in the motor test platform to run in speed mode. The speed command is set according to the working condition data. When in torque mode, the torque command is also set according to the working condition data. Apply the corresponding load motor speed and tested motor torque at the corresponding time point to automatically complete the working condition test of the tested motor and driver. At the same time, the basic parameters such as voltage, current, power, temperature and waveform curve of the motor under test are simultaneously recorded, and the instantaneous efficiency and the average efficiency of the selected interval are calculated in real time.
&Chengdu Panfeng Technology is committed to the experimental development and practical training teaching equipment of automotive electronics and C-bus networks. It independently develops and provides product schematics and source programs for secondary development. Can simulate, record, simulate and send C communication information! For more details, please consult
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