AN1914

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AN19141. Introduction
This Application Note describes the design of a 3-phase
sensorless BLDC motor drive with Back-EMF Zero Crossing. It
is based on Freescales 56F80x family dedicated for motor
control applications.
The concept of the application is that of a speed-closed loop drive
using Back-EMF Zero Crossing technique for position detection.
It serves as an example of a sensorless BLDC motor control
system using a Digital Signal Controller (DSC) and SDK support.
It also illustrates the usage of dedicated motor control on chip
peripherals， software drivers and software libraries that are
included in the SDK.
This Application Note includes a description of the controller
features， basic BLDC motor theory， system design concept，
hardware implementation and software design including the PC
master software visualization tool.
Today more and more variable speed drives are designed into
appliance products to increase product performance and system
efficiency. The low dynamic drive， whereby the load or speed is
changed quite slowly in comparison with the system mechanical
time constant， is a solution for many common appliance
applications because simple algorithms can perform the control
tasks. Moreover， the necessary computing power