March 24,Suzhou Rail Transit Line 3 engineering vehicle full silicon carbide permanent magnet direct drive trainThe world premiere event was held at the Xushuguan Depot of Suzhou Rail Transit Line 3. This train usesThe third generation of full silicon carbide semiconductor technology, running on an air-cooled permanent magnet direct drive motor and a completely independent intellectual property permanent magnet direct drive bogie, marking the official delivery of CRRC’s first all-silicon carbide permanent magnet direct drive train.

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Suzhou Rail Transit Line 3 Permanent Magnet Direct Drive Project is sponsored byCRRC Nanjing Puzhen Rolling Stock Co., Ltd.Responsible for vehicle development.

The permanent magnet direct drive vehicle of Suzhou Rail Transit Line 3 adopts advanced technologies such as permanent magnet direct drive bogie, third-generation semiconductor full silicon carbide driven permanent magnet drive traction system, traveling air-cooled permanent magnet direct drive motor, train Ethernet control network, independent "EPB01" frame control braking system, and vehicle lightweight design. As the next generation urban rail transit product,It has a leading domestic and international first-class status and is the world's first all-silicon carbide permanent magnet direct-drive subway train to roll off the production line.

The permanent magnet direct drive train of Suzhou Line 3 has the following advanced features: 

01、For the first time in the country, all-silicon carbide power semiconductor technology was adopted, has the characteristics of high power density, switching frequency up to 30kHz, low harmonic loss of the motor, high efficiency and energy saving. In addition, the traction system adopts the 1C1M (one traction converter with one traction motor) method. This integrated module not only ensures high-performance and reliable traction, but also greatly reduces the size of the traction converter;

02. It adopts a traveling air-cooled permanent magnet direct drive motor, alsoIt is the first permanent magnet motor to achieve natural cooling in China., with the characteristics of high efficiency, closed motor, easy maintenance, low noise, and high comfort. According to preliminary estimates, the application of silicon carbide devices alone can save more than 5% energy than traditional silicon devices. With the application of permanent magnet direct-drive traction motors, permanent magnet trains will save up to 20% more energy than trains using asynchronous traction systems;

The permanent magnet direct drive train of Suzhou Line 3 has completed the basic function debugging of the vehicle, and is currently undergoing joint signal debugging.It is planned to complete the test of the permanent magnet direct drive train by the end of 2021. After completing all debugging and test verification, the train will be officially operated with passengers.

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