Hongguang Mini Motor And Inverter Cooling Solution

The motor and inverter controller of Hongguang mini are on the rear axle. The high-voltage battery is connected to the motor inverter controller through two high-voltage DC cables. The motor inverter controller converts DC to three-phase AC to drive the permanent magnet synchronous motor.

Since natural air cooling is used as the cooling solution for the motor and inverter, of course there must be enough wind energy to blow on the electric drive system, so there is no blockage on the rear axle of Wuling Hongguang Mini. As the vehicle speed increases, natural wind blows to the motor and inverter. The surface of the motor and inverter is designed with pin fin heat sink to fully dissipate heat during the driving process.

From a safety point of view, it is still a bit panic. If there are splashing stones or other sharp objects on the road, it is a huge threat to the exposed motor and inverter. And there is a problem when the speed is low and the power is high, such as when climbing a steep slope. At this time, the vehicle speed is low but the power is high, and the heat production is large. Because the wind speed is related to the vehicle speed, the cooling air flow rate is not enough to connect the motor to the reverse direction. If the heating zone of the converter goes away, the motor may overheat.

Friends with Hongguang Mini can also try to accelerate and decelerate continuously at a speed of zero hundred kilometers per hour to see if the acceleration time becomes longer after driving it a few more times. If so, it means that the temperature of the motor and inverter has risen to a certain threshold, and the system limits the torque output. However, the acceleration of Hongguang mini from 100 kilometers to 100 kilometers takes tens of seconds, so there is enough time for the flowing air to take away the heat, which is not comparable to the acceleration of 100 kilometers in seconds of Tesla, Weilai, and Xiaopeng.