Motorola M68HC08 - Manual (Page 143)

User Guide
Tuning for Customer Motor
DRM028 — Rev 0 Designer Reference Manual
MOTOROLA User Guide 143
22. Observe the current transient at Alignment start, then stop motor
(or reset software)
23. Then modify the regulator parameters with PC master software as
in steps 8. , 9. , 10. , and 11.
24. Repeat steps 21. to 23. until regulation is improved
25. Open const_cust_x.h and modify the regulator parameters with
the final variable values evaluated with PC master software
26. Build the code (see Software Execution and Build )
The last Alignment setting constant is Alignment Time period [ms]:
/* MUST_CHANGE_6_EXPER: */
#define PER_T_ALIGN_MS 1000.0
Range: <0,PER_BASE_T3_ALIGN_US/1000/255>
This period can be set experimentally. This constant can also be
evaluated using PC master software tuning file. This period must be high
enough to let the rotor stabilize during Alignment state. It is
recommended that you begin with large values such as 20,000 ms, then
it can be lowered. The period should be set to ensure that the rotor (and,
therefore, also the current) is stabilized at the end of Alignment state.
6.5.5 Software Customizing to Motor — Commutation and Start-up Control Setting
When all voltage and current settings are done, the motor commutation
and start-up parameters need to be set.
For settings which must be done, follow the labels MUST_CHANGE_nn,
MUST_CHANGE_EXPER_nn in file const_cust_x.h.
For changes, which can be done (but usually are not necessary), follow
the labels CAN_CHANGE_nn, CAN_CHANGE_EXPER_nn in file
const_cust_x.h
NOTE: Thanks to the Motorola patented start-up technique, the start
parameters setting is quite simple and reliable. However, in order to
reliably start the motor, the commutation control constants must be
properly set.
Detailed description starts here.
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Freescale Semiconductor, Inc.
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