System description系统说明

The drive motor system is one of the core of electric vehicles. It is integrated into an all-in-one electric drive by the drive motor, reducer, motor controller (MCU), on-board charger (OBC), DC/DC converter (DC/DC), high-voltage power distribution box (PDU), high-voltage coolant heater (PTC), (oil pump controller), etc.驱动电机系统是电动汽车的核心之一，由驱动电机、减速器、电机控制器(MCU)、车载充电机(OBC)、直流变换器(DC/DC)、高压配电盒(PDU)、高压液体加热器(PTC)、（油泵控制器）等集成组成多合一电驱。

The motor controller receives the torque request command from the vehicle controller, collects the driving motor speed, temperature, position and other signals, and calculates and reports the torque capability, drives the vehicle forward and backward and recovers braking energy. It also has overvoltage, overcurrent, undervoltage, undercurrent and overheating protection functions.电机控制器接收整车控制器的请求扭矩指令，采集驱动电机转速、温度、位置等信号，并计算上报扭矩能力，驱动车辆前进与后退并且回收制动能量，同时具有过压、过流、欠压、欠流及过热保护功能。

Driving the vehicle: The vehicle's high-voltage power-on is completed. The motor controller accepts the vehicle controller's command and inverts the high-voltage DC power into AC power. By adjusting the voltage, frequency, and phase sequence of the output AC power, it controls the starting, rotation direction, and speed of the drive motor.驱动车辆：整车高压上电完成，电机控制器接受整车控制器命令，将高压直流电逆变为交流电，通过调整输出交流电的电压、频率、相序，控制驱动电机的起动、旋转方向和转速。

Energy recovery: When braking, the controller calculates the total braking force demand based on signals such as braking depth, reasonably distributes the braking force through calculation, and converts the driving kinetic energy into electrical energy according to a certain ratio.能量回收：制动时，控制器根据制动深度等信号计算制动力总需求，通过计算来合理分配制动力，按照一定的比例将行驶的动能转化为电能。

Overvoltage, overcurrent, undervoltage, and undercurrent protection function: When the motor controller detects overvoltage, overcurrent, undervoltage, or undercurrent, the controller will stop outputting current and report a corresponding fault.过压、过流、欠压、欠流保护功能：电机控制器检测到过压、过流、欠压、欠流时，控制器会停止输出电流并且报出相应故障。

Overheating protection function: The motor controller collects the temperature sensor signals inside the motor controller and the drive motor, and blocks the current output or limits the maximum current value according to the appropriate shutdown overheating protection value and power consumption reduction protection value to achieve the purpose of stopping or driving with reduced power consumption.过热保护功能：电机控制器采集电机控制器和驱动电机内部的温度传感器信号，根据合适的停机过热保护值、降功耗保护值来封锁电流输出或者限制电流最大值以达到停车或者降功耗行驶的目的。

Oil pump controller: The drive motor and differential adopt an oil cooling solution. When the oil pump controller works, it drives the lubricating oil to circulate in the pipeline and oil cooler, taking away the heat of the drive motor and differential; at the same time, the differential can also perform splash lubrication.油泵控制器：驱动电机和差速器采用油冷冷却方案，油泵控制器工作时带动润滑油在管道及油冷器中循环流动，带走驱动电机和差速器的热量；与此同时，差速器也可以起到飞溅润滑。