[amsat-bb] Re: Motor for Yaesu G5500 Azimuth Rotator?
jfitzgerald at alum.wpi.edu
Sat Feb 25 21:24:40 PST 2012
On 2/25/2012 4:25 PM, Phil Karn wrote:
> If it really was a 3-phase induction motor then there *had* to be some
> sort of phase shift at least to start it.
Of course you are right. I found a schematic of their controller
The phase shift is done with C7 and C8, but I have to spend some time
with the schematic to figure out exactly what they are doing. I
expected to see a microcontroller/DSP individually controlling each of
the 3 legs.
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