Keywords-Brushless DC motor (BLDCM); TMS320F28335;
Control system
I. MATHEMATICAL MODEL OF BRUSHLESS DC
MOTOR
Comparing with SCM and PC, DSP has its
characteristics of higher precision and speed when it is used
in control system for motor, and its storage space is large. It
has the ability of logic control and handling all kinds of
interruption. Besides it has digital I/O ports, communication
ports and special motor control PWM ports, which are
integrated in one chip. With the development of large scale
integrated circuit technology, DSP chip will becoming more
and more powerful.
Brushless DC motor uses an electronic reversing
device replacing with the mechanical reversing device of
brush DC motor. It not only reserves the feature of smooth
and wide speed regulation, but also overcomes series of
defects provoked by reversion in brush DC motor. And it
has the features of high energy density, high efficiency and
high inertial torque. Its mechanical property should be
described as the equation (2.1) shown as follow.