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Geo Brick Drive User Manual
Motor Setup
210
AC Induction (Asynchronous) Motor Setup
– Without Encoder, Direct
Micro-Stepping
Before you start
The AC Induction Motor Setup section is conceived for Motor#4, which is most commonly used
in Geo Brick Drive applications as a Spindle.
Parameters with comments ending with
-User Input
require the user to enter information
pertaining to their system/hardware.
Description of the setup parameters can be found in the
Turbo Software Reference Manual
For an AC Induction Motor with no encoder, we will use the direct microstepping technique for direct
PWM motor control. This technique creates a simulated position sensor and feedback loop by numerically
integrating the (velocity) command output from the servo loop. This integration requires two entries in the
encoder conversion table. The resulting simulated position value can be used for both motor phase
commutation and servo-loop feedback.
Encoder Conversion Table Setup
The first entry in the encoder conversion table (ECT) for each Induction Motor must read the servo-loop
output like an absolute encoder. This is done with a “parallel-read” entry of a Y/X double register (the
data is in X), unshifted and unfiltered; specifying the use of 24 bits of the 48-bit Y/X register, starting 24
bits from the low end. This is effectively like reading a 24-bit DAC register.
The second entry in the ECT for each Ac Induction motor integrates the result of the first entry.
1-
Find an open ECT, or preferably go to the
end of Table.
2-
Choose Conversion Type, Width in Bits
and Offset Location (as shown)
3-
Choose No Shifting, then enter the source
address corresponding to the
channel/motor # (see table below)
4-
Click Download Entry
1-
Go to the Next Entry
2-
Choose Conversion Type, enter previous
entry number, delete the source address and
disable the use of second entry (as shown)
3-
Click Download entry, and record the
processed data address (i.e. X:$350B). This
is where the commutation and position
simulated encoder data is generated.
Содержание Geo Brick
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Страница 286: ...Geo Brick Drive User Manual Appendix A 286 APPENDIX A Schematic Samples Watchdog X15 Inputs J6 J7...
Страница 287: ...Geo Brick Drive User Manual Appendix A 287 Outputs J6 J7 603793 109 and earlier Outputs J6 J7 603793 10A and later...
Страница 288: ...Geo Brick Drive User Manual Appendix A 288 Limits Flags J4...