Sensorless Brushless Dc Motor Reference Design

 This reference design provides a hardware and
software solution for Sensorless Brushless dc motors.
This document includes complete schematics, printed
circuit board layout, and firmware. The Sensorless
Brushless dc motor reference design may be used as a
starting point for Motor Control system designers using
Silicon Laboratories MCUs,  significantly reducing the
design time and time to market.
Brushless dc motors consist of a permanent magnet
rotor with a three-phase stator winding. Brushless dc
motors evolved from conventional dc motors where the
function of the brushes is replaced by electronics.
Brushless dc motors offer longer life and less
maintenance than conventional brushed dc motors.
Most Brushless dc motor designs historically use Hall
effect Sensors to measure the position of the rotor. Hall
effect Sensors provide absolute position information
required to commutate the motor. Using Hall effect
sensors provides simple, robust commutation and
performance roughly comparable to brushed dc motors.
One of the major barriers limiting the market penetration
of Brushless dc motors has been the cost of using Hall
effect Sensors The Hall Effect Sensors themselves are
not particularly expensive. However, the Hall effect
assembly adds significant  expense to the cost of
manufacturing the motor. Hall Effect Sensors also
typically require 5 additional wires, adding to the
installation costs.  
 Voltage Regulator 3.3 V SOT223 LM2937IMP-
3.3
National
USB-to-UART Bridge MLP20 CP2101 Silicon 
Laboratories
Gate Driver IC SO8 TC4428COA Maxim
Small Form Factor
MCU
QFN32 C8051F310 Silicon
Laboratories
Low-Voltage Op-Amp  SO8 LMV358M National
30V Complementary
MOSFET
SO8 IRF7309 International
Rectifier
Triple TVs Diode SOT-143 SP0503BAHT Littlefuse
application notes                    New application notes
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Sensorless Brushless Dc Motor Reference Design application circuits
Sensorless Brushless Dc Motor Reference Design application circuits



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