Check the max frequency on any encoder you look at. The inexpensive ones
max out at 200 K. Frequency is not a problem is you want to throw $$ at
it. It is very hard to win; lots of counts at the high end but not many
when you are creeping. There just ain't no free lunch.
Dave
On 2/11/20 10:43 PM, andrew beck wrote:
Hi guys
wondering if anyone has any ideas here.
I have a heidanhain spindle motor that runs up to 10000 rpm and has a 5v
sin cos encoder on it. I am currently controlling the motor with a
schiender vfd. I am talking to the support engineers here in New Zealand
about buying a encoder card so I can get better low down torque. If I run
the card in full encoder closed loop control in the vfd I can get 200
percent of the torque right down to 0 rpm for 30 seconds or so which is
pretty useful. I am currently just running the drive in Variable frequency
control which rapidly looses torque at low rpm.
Anyway they have a bunch of cards I can use but don't have a encoder card
that is suitable for sin cos encoders. I have no trouble changing the
encoder but am not sure if I can get a source of encoders that spin up to
10k rpm.
Anyone have any suggestions?
regards
Andrew
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