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Autor: asterj asterj
Technical level of drive motors at home and abroad
Overall, China's drive motors have made great progress, and have independently developed products that meet the needs of various new energy vehicles. Some of the main performance indicators have reached the international advanced level of the same power level. However, there is still a certain gap with foreign countries in terms of peak speed, power density and efficiency
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Comparison of permanent magnet synchronous motor parameters of domestic and foreign drive motor companies
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In terms of technical indicators, domestic motors still have the following gaps compared to foreign motors: peak speed, peak speed is an important indicator of the drive motor, and it is also the most obvious gap between the domestic drive motor and the foreign motor. The peak speed of most permanent magnet synchronous motors in China is below 10,000 rpm, while abroad is basically above 10,000 rpm.
power density
Although domestic motors can basically reach the international level in terms of power, there is a weight disadvantage under the same power condition, so there is a big gap between the power density and the international level. At present, the power density of permanent magnet synchronous motors in China is mostly in the range of 1 to 2 kw / kg, which is far from the target value of 3.5 kw / kg in 2020.
Efficiency, in terms of motor efficiency, the highest efficiency of domestic motors has reached 94% to 96%, which has reached the level of Siemens, Remy and other companies. However, there is still a certain gap in the area of ??the high-efficiency area, such as the proportion of areas where the system efficiency is greater than 80%. The area of ??the motor's high-efficiency area in China is concentrated in 70% to 75%, while foreign motors basically reach 80%.
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