AN1913 Motorola / Freescale Semiconductor, AN1913 Datasheet - Page 36

• Manufacturer Part Number: AN1913
• Description: AN1913 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x
• Manufacturer: Motorola / Freescale Semiconductor

Software Design
36
Omega_Required_Mech
Status_Commutation
The control algorithm of the BLDC motor drive with Back-EMF Zero Crossing using AD convertor, is
described in
Manual Speed
Setting
State Machine
Figure 7-3
Application
Process
Master
PVAL0,PVAL1
PC
ApplicationMode
BLDC control with BEMF Zero Crossing using ADC
and
Cmd_Application
Figure
Figure 7-4. Data Flow - Part 2
START/STOP
Switch
Cmd_Application
7-4.
Commutation Control
Cmt_Drv_RqFlag
PVAL2,PVAL3
PWM Generation
Process
Step_Cmt,
Process
Zero Crossing Offset
DC-Bus Voltage
U_Dc_Bus
Setting
Process
(A/D)
PVAL4,PVAL5
U_ZC3Phase
U_Dc_Half
ZCross Interrupt Flag
ADC Zero Crossing
Phase
Voltages
Checking
Process