Wiring terminal wiring and control method for brushless motor driver
Brushless motor drives play a very important role in industrial applications. As a professional terminal manufacturer, Shanghai Lianjie Electric Co., Ltd. mainly analyzes the wiring application and basic control methods of its terminals:
Commonly used terminal blocks for brushless motor drives
This brushless motor driver uses the LC and LZ series male and female PCB terminal blocks manufactured by Shanghai Lianjie Electric. The LC1 series has a pitch of 3.5, 3.81, 5.0, 5.08, 7.5, and 7.62 poles, 2-24 lines, and can be fitted with a screw-mounted socket for matching and shock-resistant connection. The plug uses a side attachment technique, ie the direction of the screw is perpendicular to the direction of wire entry. LZ is the perfect complement to the LC series.
Brushless motor driver control method
When the motor rotates, the control unit will compare the speed of the drive setting and the acceleration/deceleration rate with the speed of the hall-sensor signal change (or by software operation) to determine the next set ( AH, BL or AH, CL or BH, CL or ...) The switch is turned on and the length of the on time. If the speed is not enough, it will be long, and if the speed is too long, it will be shortened. This part of the work is done by PWM. PWM is the way to determine whether the motor speed is fast or slow. How to generate such PWM is the core to achieve more precise speed control. High-speed speed control must consider whether the CLOCK resolution of the system is sufficient to grasp the time of processing software instructions. In addition, the data access mode of the hall-sensor signal change also affects the processor performance and the correctness and real-time. As for the low speed speed control, especially the low speed start, since the return hall-sensor signal changes more slowly, it is very important to learn the signal mode, the processing timing, and appropriately configure the control parameter values according to the motor characteristics. Or the speed feedback change is based on the encoder change, so that the signal resolution is increased in order to get better control. The motor can run smoothly and respond well, and the proper control of P.I.D. cannot be ignored.
It is mentioned that the DC brushless motor is closed loop control, so the feedback signal is equal to telling the control unit how much the motor speed is now from the target speed. This is the error. Knowing the error naturally requires compensation, and the method has traditional engineering control such as P.I.D. control. However, the state and environment of control are complex and changeable. If the control is to be sturdy and durable, the factors to be considered may not be completely mastered by traditional engineering control, so fuzzy control, expert systems and neural networks will also be incorporated into intelligent An important theory of PID control.
