Hello Bendik,
The Saietta DC motors are fine with reversing. These are the Cedric Lynch design motors - we have been using the LMC motors in the Thoosa systems for years which were also designed by Lynch and are very similar to the Saietta motors. We are starting to use the Saietta motors in the Thoosa systems now and are the North American distributor for Saietta motors. They are powerful, small in size, can do regeneration and hold up extremely well in the marine environment.
The issue with reversing is that, yes, there is some wear on the brushes when going in reverse. However, we don't go in reverse for long periods, so it becomes a mute point since the wear on the brushes is minimal when run for short periods.
Sally Reuther
Annapolis Hybrid Marine
On Thu, Aug 18, 2016 at 5:08 AM, Bendik Vignes bendik.vignes@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
Hi John!Thanks for a lot of information again:-)The Agni and Saietta I did not know about, thanks for links. Curves for these motors looks very nice.But I have bben told there is an issue about reversing DC-motors. The brushes can be damaged..? I asked thunderstruck motors about Perm 132, and they told me that this motor is made for one way rotation only.. If this is tru to most DC-motors its not so nice for a boat (unless I use reverse gear..:-/) But you use a DC-motor John!How can I know which DC-motors work fine in forward/reverse or only one-way??A big advantage with a DC-motor, as I see it, is simple speed controll. The last days I have been looking into AC motors and their motor controllers. But It seems to be a very difficult task to program a motor controller for a specific motor.Do you know which Perm motor Greenstar is using? Perhaps it is one of the AC versions (PMS maybe)..RegardsBendikOn Wednesday, August 17, 2016 6:19 PM, 66b6dcd5b59507e7d751ea81382ea1f6 <no_reply@yahoogroups.com> wrote:
[Attachment(s) from 66b6dcd5b59507e7d751ea81382ea1f6 included below] Bendik,
Here's some performance data and graphs for an AGNI 143 attached. Also here's a 95 R which is a higher RPM/Volt. The R stands for reinforced.
http://www.jozztek.com/shop/content/9-technical-data-on- agni-motors
AGNI as you probably now know are now Saietta. No load torque per amp and rpm per volt is based on:
Kt (N-m/amp) = 9.5478 / Kv so if you know one value you can calculate the other for a DC brushed motor of this type.
I just asked Cedric about the Kt, Kv values for his newer 119R motor.
http://www.saiettaengineering.com/motors/
His answer is here:
https://www.facebook.com/MotoERacing/videos/ 832549320213232/
To convert rad/sec to rpm:
http://www.convertunits.com/from/rad/sec/to/RPM John R.
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Posted by: Sally Reuther <smreuther@gmail.com>
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