单片机控制的无刷直流电机驱动系统设计
The Design of The Brushless DC Motor
Control System
Abstract
This thesis is part of the project named" the controller of the Brushless DC Motor for
electric-bike". The control system consists of Brushless DC Motor, controlling part, sensor
part, hardware and software controlling part. With its unique advantages of high efficiency,
high reliability, good control ability and maintenance-free, it is widely used in many fields.
To developth electric-bike will be helpful to solve the pollution problem caused by the
waste gas from the gasoline-automobiles and energy sources problems. The task is to
design a Brushless DC Motor (BLDCM) control system for electric-bike. According to the
project, PIC16F72M CU produced by Microchip Company has been selected. The design
of hardware including power circuit, hardware protection circuit, electronic commutate
circuit have been carried out. The software was designed following the principle of
modularization and structured programming and using assembly as the programme
languages. Typical PI controls theory is used to control the speed. Less voltage protection,
current excessive protection and wrong angle protection are designed to reinforce the
system. Also, factors that affect the reliability of the system are discussed in this paper, and
some methods are introduced soon after. This cont roller realizes three work modes-
electromotion, stationary speed and assisting work mode. Another self-test mode, which
works under error, is also designed. This kind of brushless DC motor control system is
superior in many fields such as high reliability, simple hardware structure, low cost, and
convenient for the further development.
Key Words
Electric bike, Brushless DC Motor, PIC, Control System
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