Brushless dc motor is how to realize the speed control? The brushless dc motor company will meet every days, is the potential customer demand for brushless motors are used to inquire of the common problems, so the brushless dc motor is a must to explain this knowledge.
brushless dc motor without brush wear and maintenance is relatively simple, the more reliable brush, but need to install driver (The reversing)Circuit.
in the first case of brushless dc motor speed control way is: mainly by voltage control, to control the torque is mainly composed of current, usually with a matching motor drive, just changing the output voltage of a driver can control the speed of the motor, if there is no drive, want to directly control the motor, need to see the power and the working current of the machine. If can use resistance is small power motor speed regulation,Is not recommended, the method is simple, series a potentiometer, but this way will reduce the efficiency, so not recommended), high-power motor resistance speed cannot be used, because it requires a high power small resistances (Motor working resistance is very small), and that the resistance is not good looking for this solution efficiency is too low, it is better to find a matching drive
the second type of brushless dc motor speed regulation method: PWM speed regulation of dc motor PWM speed control principle and ac motor speed control principle is different, it is not by frequency modulation way to adjust the speed of motor, but through adjust the way of driving voltage pulse width, and cooperate with some corresponding energy storage components in circuit, changed to the armature voltage amplitude, so as to achieve the goal of dc motor speed change. It is way of modulation amplitude modulation. There are two kinds of PWM control method:
1. Using PWM signal, control transistor conduction time, conduction, the longer, the work is done, the longer the higher the speed of the motor
2. Using PWM control signal control transistor conduction time, change the control voltage levels to implement the
with dc motor has the advantage of starting torque, speed control system has simple structure, low price, however faults have many such as noise, easy to damage, for carbon brush, so gradually replaced by the brushless dc motor.
the above for the brushless motor manufacturer is how to realize the speed control for brushless dc motor, the interpretation of a find it difficult to understand, how you feel or technician can ask brushless dc motor for you a more detailed explanation. http://www。 rc。 cn
