Re: Gecko G420's question

Nicolas Benezan <bene@...>
said:

Someone said, the brushless geckos will have the same
voltage and
current rating as the others (80V 20A). But most
brushless motors
available here in Europe are 600V-types (directly fed
from 400V mains
without transformer). Are there any sources for 60-80V
brushless
motors?

The Japanese seem to make most of the lower voltage
motors. Fanuc motors are rated at 85v, as I recall.
Tamagawa and Yaskawa both have motors rated at 100v,
and I'm guessing that the other Japanese vendors do as
well. The American vendors generally have motors
rated at 200v, although most Reliance are rated at
460.
Having said that, the relationship in Mohan for
brushless motor drives says that the RPM is
proportional to the voltage. This means that, just
like a brushed dc motor, you can use a lower supply
voltage if you are willing to live with lower top end
speed.

Eric Keller

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