Adjusting the speed of the brushless DC motor can be achieved in the following ways:

1. Regulating voltage:

The input voltage of the motor is adjusted by changing the output voltage of the driver, thus changing the speed of the motor.

2.PWM speed regulation:

Using pulse width modulation (PWM) technology, the constant DC supply voltage is modulated into a pulse voltage sequence with fixed frequency and variable width.

By changing the duty cycle of the PWM (that is, the time ratio of the high level to the low level), the average output voltage can be adjusted to change the speed of the motor.

3. Series resistance speed control:

A potentiometer is connected in series in the motor circuit to adjust the speed of the motor by changing the size of the resistance.

This method is suitable for low power motors, but is less cost-effective for high power motors due to the need to find a high power resistor with the right resistance value.

4. Change the power-on sequence:

For the case that the steering needs to be changed, it can be achieved by changing the order of the power-on of the phases.

For example, the running direction of the motor can be controlled by connecting terminal dir and terminal com.