User Guide
Table Of Contents
- 1.1 SETTING SOFTWARE PARAMETERS
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DS70640A-page 10 2010 Microchip Technology Inc.
• D-axis Current Reference
D-axis reference current lookup table (I
D) has values between 0 and the nominal
stator current, distributed evenly on 18 entries of the lookup. The nominal stator
current can be taken from the motor specification. If it is unknown, this value can
be approximated by dividing the rated power over the rated voltage.
userparms.h
• Voltage Constant Inverse
The lookup table entry corresponding to the maximum speed achievable in field
weakening is proportional to the percentage of increase of mechanical speed
from nominal to the maximum values. In the lookup table entries, the values are
evenly distributed and if the inverse voltage constant for maximum speed
exceeds the numerical representation range (32,767), adjust the corresponding
Predivision scaling factor. Note that the following numbers are predivided by 2
(see Figure 1-1).
userparms.h