Is the MCU of a dual motor
electric scooter important

Many people have always thought that the battery and motor of the dual motor electric scooter are the most important, but they have always ignored the MCU microcontroller of the dual motor electric scooter. Is the MCU microcontroller really that important?

The answer is: very important, and the control system is the “brain” of the electric scooter, electric scooter start, run, into and out, speed, stop relying on the scooter in the motor control system.

The electric scooter can run quickly and safely, the performance of the motor control system is very high, and the efficiency of the motor also has more important requirements. At the same time, as practical transportation, the motor control system is required to be able to withstand vibration, withstand harsh environments and be highly reliable.

The conventional hardware design scheme of the scooter control system is shown below, which mainly includes modules such as driver MCU, a gate driver circuit, MOS driver circuit, motor, Hall sensor, current sensor and speed sensor.

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MCU works through power energized and uses communication interface and charging module and power supply and power module to communicate. The gate drive module is electrically connected to the master MCU and drives the BLDC motor through the OptiMOSTM drive circuit. The Hall position sensor senses the current position of the motor, and the current sensor and speed sensor can form a dual closed-loop control system to control the motor.

After the motor is started, the Hall sensor senses the current position of the motor and converts the rotor pole position signal into an electrical signal, which provides the correct phase change information for the electronic phase change circuit to control the switching state of the power switch in the electronic phase change circuit and feeds the data to the MCU.

The current sensor and speed sensor form a double closed-loop system. The input speed difference, the speed controller will output the corresponding current magnitude, and then the difference between this current and the actual current magnitude is used as the input of the current controller, and then the corresponding PWM is output to drive the permanent magnet rotor to rotate continuously for commutation control and speed regulation control. 

The use of a double closed-loop system can enhance the anti-interference of the system. The double closed-loop system increases the feedback control of the current, which can reduce the overshoot and oversaturation of the current and get a better control effect, which is the key to the smooth movement of the electric scooter.

Some scooters are also equipped with an electronic anti-lock system. 

This system detects the wheel speed by sensing the wheel speed sensor, and if it detects that the wheel is in a holding state, it automatically controls the size of the braking force of the holding wheel so that it is in a rolling and sliding state (the side slip rate is about 20%), which ensures the safety of the owner of the electric scooter, and FIDICO’s dual-motor high-power scooter follows this kind of technology.

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