Abstract
Brushless DC motor with permanent excitation is a new special motor developing in recent year, which changes its phases through the electronic units.It is a production which includes the feature of mechanics and electrical engineering.This new motor has not only the same good characteristics of seed control,high efficiency and high rise torque as traditional DC motor,but also the same good characteristics of simple structure,stable reliability,easy maintainance of AC Motor Brushless DC motors.
This system design is presses the velocity modulation using the accent, supplies power the PWM power source's dutyfactor then regulation voltage way according to the adjustment to realize. This design uses not brushes direct current machine special-purpose control chip MC33035, it can the position signal which examines to the Hall sensor carry on the decoding, it has the overflow, overheated, the undervoltage, to reverse the choice and so on auxiliary function, the composition system needs the peripheral circuit to be simple, the designer does not need, because uses the discrete component composition huge analogous circuit, causes system's design, the debugging to be quite complex, moreover must take the very big area the circuit wafer.
The MC33035 this kind of integration chip may also complete conveniently not brushes the direct current motor to reverse, the revolution starting as well as the dynamic braking, the overflow protection, the three-phase driving signal production, the electric motor rotational speed simple closed-loop control and so on. Uses the special-purpose integrated chip constitution not to brush the direct current machine control system, has the integration rate to be high, speed quick and characteristics and so on perfect protection function. The driving circuit structure is simple, thus the entire line periphery part few, walks the line to be simple, may reduce the invertor volume greatly.
Keywords：Brushless DC motor;MC33035 control circuit;drive circuit
