The discharge current of nine tubes is high, and the price is a little higher than that of six tubes.

6 tubes have less force than 9 tubes. A 6-tube controller means that there are 6 MOS tubes in the controller. There are 9 tubes. It's just that the strength will increase, but the speed will not increase. The only way to speed up is to replace the motor with a higher speed. The controller (English name: controller) refers to the master device that controls the starting, speed regulation, braking and reverse of the motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit in a predetermined order. It is composed of program counter, instruction register, instruction decoder, timing generator and operation controller. It is the "decision-making body" that issues commands, that is, it coordinates and commands the operation of the entire computer system.

Method of measuring controller: The controller has six MOS tubes. Generally, the MOS tubes are burnt when the controller is broken. How to determine whether the MOS tubes are burnt without opening the shell is as follows:

Don't connect any wires to the controller, take it down.

Pull the multimeter to the diode gear, which is generally on and off.

There is a diode in any MOS tube. If the MOS tube burns, the diode will burn. Therefore, the quality of the MOS tube depends on the quality of the MOS tube. Measure the diode according to the following steps. The multimeter displays a steady voltage of 0.37~0.44V, indicating that the MOS tube is good. If 0V is displayed, the MOS tube is broken down; If the voltage above 0.7V is displayed, the MOS tube is broken.

For the three-phase MOS tube of the upper arm of the controller, the black probe is connected to the positive pole access line of the secondary battery (the pure controller is connected to the main line), and the red probe measures three phase lines respectively.

The lower arm three-phase MOS tube of the controller part, the red probe is connected to the main battery negative pole access line (the negative line is connected to the pure controller), and the black meter hair measures three phase lines respectively.

To ensure the safety of the controller and battery.

Dynamic and static phase failure protection: it refers to the protection provided by the controller in case of phase failure of any phase of the electric vehicle motor when the motor is running, so as to avoid burning the motor, protect the electric vehicle battery and extend the battery life.

Dynamic protection function of power tube: during dynamic operation, the controller monitors the working condition of power tube in real time. Once the power tube is damaged, the controller implements protection, so as to prevent the cart from being laborious after damaging other power tubes due to the interlocking reflection.