AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 28

• 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

Hardware
5.5 Speed Control
6.
6.1 System Outline
Notes: The detailed description of individual boards can be found in the User’s Manuals for each board.
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The speed-closed loop control is provided by a PI regulator as described in
speed (Omega_Actual) is computed from the average of two Back-EMF Zero Crossing periods (time
intervals) gained from sensorless commutation control block.
The speed controller works with a constant execution (sampling) period PER_SPEED_SAMPLE_S
(request from timer interrupt).
The motor control system is designed to drive the 3-phase BLDC motor in a speed-closed loop.
The application can run on Motorola motor control DSPs using the DSP EVM Board:
The hardware setup of the system for a particular DSP varies only by the EVM Board used. The
application software is identical for all DSPs, the EVM and chip differences are handled by SDK
drivers for the particular DSP EVM board.
Automatic board identification allows one program to run on each of three hardware and motor
platforms without any parameter change:
The hardware setup is shown in
in
Section
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The user manual incorporates the schematic of the board, description of individual function blocks
and bill of materials. The individual boards can be ordered from Motorola as a standard product.
Hardware
DSP56F803
DSP56F805
DSP56F807
Low Voltage Evaluation Motor Hardware Set
Low Voltage hardware set
High Voltage hardware set
11.1.
BLDC control with BEMF Zero Crossing using ADC
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure
Go to: www.freescale.com
6-1,
Figure 6-2
and
Figure
6-3. More info can also be found
Section
7.2.5. The actual