AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 46
AN1913D
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
Datasheet
1.AN1913D.pdf
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Software Design
7.3.6 State Diagram - Process ADC Zero Crossing Offset Setting
46
Reset
The
Registers
free phase average
Figure 7-11
Zero Crossing Offset
measure
Commutation status:
Figure 7-11. State Diagram - Process ADC Zero Crossing Offset Setting
Setting Disabled
Commutation status:
described in Section
Alignment
U_Dc_Bus and
Stopped
state diagram describes the tuning process of the ADC (Zero Crossing) Offset
BLDC control with BEMF Zero Crossing using ADC
Freescale Semiconductor, Inc.
U_Phx
For More Information On This Product,
Section 5
Go to: www.freescale.com
Commutation status:
and Section
Alignment End
setting of ADC Offset registers to
Commutation status:
Coef_Calibr_U_Phx * U_Dc_Bus
= (U_Dc_Bus_Half + U_Phx)/U_Dc_Bus
Running/Starting
Section
U_Dc_Bus_Half =
calibration coefficient
Coef_Calibr_U_Phx =
7.2.4.
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