[TowerTalk] rotary tower: 3 phase motor : soft-start/stop controller or frequency regulator?

[Richard Riley <Richard.Riley@tango.hr>]

Hi guys,

After 4 years waiting for our building permit, next week sees the first of 5 
towers to go up at 9A1TT.
The first is the smallest at 31m..and will carry 4 owa yagis with 7,6,5 and 
4elements on 10 thru 40m.
Tower is 500mm triangular HD.  Base, rotating system and rings are locally made.

We have a 3 phase motor at the bottom with built-in torque limiter.
https://www.bonfiglioli.com/media/filer_public/10/8b/108b44fb-91de-4b14-96a2-1325307b4aef/br_cat_bnex_std_eng_r01_0.pdf
Model: BN80A4.
Control is achieved using 4O3A Rotor Genius.

Question: I'd like to add soft-start and stop capability (which the above box 
doesn't support for high voltages).
Some say "use a soft start & stop controller"...others "use a frequency 
regulator".

I'm new to this field ..so wonder, what do you guys recommend?

PS. for those who responded to the "sexy cable management solution" question, I 
put out a few months back.
Thank you for your input!  The most attractive of all the suggestions I 
received, was one based on an Igus RBR solution (see 
http://www.igus.ca/wpck/3820/rotary_motion_applications )...although I haven't 
seen one in action on a rotary tower, I intend to attempt to build one and if 
successful will share my experience with you.

rgds

Richard Riley



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