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Design of Brushless DC Motor Controller-Software Part

Abstract

This design adopts the ATmega128 to achieve control of the brushless dc motor. The speed and torque control part adopts closed-loop control. The whole system is mainly composed of current detecting circuit, speed and position detection circuit, power driving circuit and over current protection circuit. The design is not only to achieve positive and reverse rotation of the motor at normal speed, but also under special circumstances. It could be done to stop the operation of motor. Because of brushless dc motor is dc motor of the characteristics, drive and frequency variation device at the same time. As known as direct current frequency conversion, brushless dc motor operation is efficiency, low speed torque, rotational speed precision and so on. The brushless dc motor based on automatic control type to perform, so not like frequency control of motor speed synchronous motor overload start under plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. For years the industry on the research of the asynchronous motor frequency control of motor speed, in the final analysis is looking for a way to control the asynchronous motor torque. Brushless dc motor is bound to its wide speed range, small volume, the field of speed advantages. It can meet the requirements of industry nodes with

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