AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 37

• Manufacturer Part Number: AN1913D
• Description: 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x
• Manufacturer: Freescale Semiconductor / Motorola

7.2.1 Process Application State Machine
7.2.2 Process Commutation Control
DC-Bus Current
Protection processes are shown in
sub-sections.
This process controls the application subprocesses by status and command words
Figure
Based on the status of the Cmd_Application Cmd flags (set by the Commutation Control process) the
Cmd_Application Rq flags are set to request calculation of the Current PI Controller (Alignment
state) or Speed PI Controller (Running state) and to control the angular speed setting (reflects the
status of the START/STOP Switch and the Run/Stop commands).
This process controls sensorless BLDC motor commutations as explained in
outputs, the Step_Cmt and the Cmt_Drv_RqFlag, are used to set the PWM Generation process. The
output Omega_Actual_Mech is used for the Speed Controller process.
(A/D)
I_Dc_Bus
7-4).
State Machine
Application
Process
BLDC control with BEMF Zero Crossing using ADC
Freescale Semiconductor, Inc.
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DriveFaultStatus
Temperature
Temperature
Process
Fault Control
Figure 7-5. Data Flow - part3
(A/D)
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Figure
PVAL0,PVAL1
7-5. It consists of processes described in the following
DC-Bus Voltage
U_Dc_Bus
(A/D)
PVAL2,PVAL3
PWM Generation
Process
(OverVoltage/OverCurrent)
PWM Faults
Section
PVAL4,PVAL5
Software Design
(Figure 7-3
5. The process
and
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