AN1914 Freescale Semiconductor / Motorola, AN1914 Datasheet - Page 49

• Manufacturer Part Number: AN1914
• Description: 3-Phase BLDC Motor Control with Sensorless Back EMF Zero Crossing Detection Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

Notes:
11.1 Current and Voltage Settings
11.1.1 DC Bus Voltage, Maximal and Minimal Voltage and Current Limits Setting
#define x_VOLT_DC_BUS
#define x_DCB_UNDERVOLTAGE
#define x_DCB_OVERVOLTAGE
#define x_DCB_OVERCURRENT
Notes:
11.1.2 Alignment Current and Current Regulator Setting
...\dsp5680xevm\nos\applications\bldc_zerocross\configextram\appconfig.h
or in the file (Flash version):
...\dsp5680xevm\nos\applications\bldc_zerocross\configFlash\appconfig.h.
The motor control drive usually needs setting/tuning of:
The SW selects valid parameters (one of the 3 parameter sets) based in the identified hardware.
Table 11-1
In the following text the EVM, LV, HV will be replaced by x. The sections is sorted in order
recommended to follow, when one is tuning/changing parameters.
For the right regulator settings, it is required to set the expected DC bus voltage in bldcadczcdefines.h:
The current voltage limits for SW protection are:
All this section’s settings are in bldcadczcdefines.h.
The current during Alignment stage (before motor starts) is recommended to be set to nominal motor
current value.
#define x_CURR_ALIGN_DESIRED_A 17.0
Usually it is necessary to set the PI regulator constants. (The PI regulator is described in algorithm
controllerPItype1 description in SDK documentation.)
Low Voltage Evaluation Motor Hardware Set
•
•
dynamic parameters
current/voltage parameters
Most important constants for reliable motor start-up are described in
Section
Note the hardware protection with setting of pots R116, R71 for DSP56805EVM or R40, R45
for DSP56803EVM (see EVM manuals for details)
High Voltage Hardware Set
Low Voltage Hardware Set
shows the starting string of the SW constants used for each hardware.
11.1.2.
Hardware Set
DSP56F80x MC PWM Module in Motor Control Applications
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 11-1. SW Parameters Marking
12.0
15.8
48.0
Go to: www.freescale.com
3.0
/* DC bus expected voltage */
/* Undervoltage limit [V] */
/* Overvoltage limit [V] */
/* Overcurrent limit [A] */
/* Alignment Current Desired [A] */
Setting of SW parameters for other motor kits
Software Parameters Marking
EVM_yyy
HV_yyy
LV_yyy
Section 11.2.2
and in
49