Section 4. 3-Phase Bldc Low Voltage Reference Design; Application Outline - Motorola M68HC08 Manual

Designer Reference Manual — DRM046

Section 4. 3-Phase BLDC Low Voltage Reference Design

4.1 Application Outline

DRM046 — Rev 0
MOTOROLA
Freescale Semiconductor, Inc.
The system is designed to drive a 3-phase BLDC motor. The reference
design meets the following performance specification:
• Voltage control of BLDC motor using Hall sensors
• Single board solution with MC68HC908QY2/4 "Nitron"
microcontroller
• Power supply voltage +48V
• Maximal power 200W (power devices rated for 100V/57A)
• Control technique incorporates:
– Position sensing using Hall sensor signals
– Voltage BLDC motor control with speed-closed loop
– Speed measurement based on Hall Sensors
– One direction of rotation
– Motoring/Generator mode
– Start from any motor position without rotor alignment
– Pre-charging of MOSFET pre-driver bootstraps before each
motor start
– Minimal speed 750 RPM (according to the motor used)
– Maximal speed 4000 RPM (according to the motor used)
• Manual interface (run/stop switch, speed potentiometer, power-on
LED indication)
• Option to connect user's interface through terminals
• Fault protection:
– DC-Bus over-current fault protection (hardware/software)
3-Phase BLDC Low Voltage Reference Design
For More Information On This Product,
Go to: www.freescale.com
(range form +36V
DC DC
Designer Reference Manual
to +56V )
DC
25