First select the motor, and then determine the controller. The motor selection range is generally 500W~3000W. Related knowledge:
1. The functions of the controller include: controlling the speed of the motor; controlling the work of electrical appliances such as car lights; brake power-off protection; low-voltage detection and protection of the power supply, etc.
2. The rated voltages of the controller, motor, and battery should be as consistent as possible, so that their respective functions can be fully utilized. If the rated voltages of the controller, the battery, and the controller are inconsistent, the controller's power supply low-voltage detection and protection functions will be lost.
3. The controller power can exceed the motor power.