Sabvoton 72150 for geared mac motor ?

Hello all,

I previously built a nice ebike using phaserunner and mac 8T motor. Very happy with it but for a second build I am planning to get another mac motor 8T with a different controller.
After a lot of reading on the forum I am willing to order a sabvoton 72150 controller (probably overkill for this motor but nice for future upgrades) and I have few questions before hitting the "buy now" button.

First and most important, the mac motor is 16 poles and 1:5 geared (ie. 80 poles for controller). I think that requires something like 50000erpm ability from the controller (correct me if I'm wrong) but I read somewhere that sabvoton can only go up to 24000erpm... Is that correct ?
In brief is this controller compatible with a mac motor 8T ?


Thank you for your help ! I'll ask other questions later

I guess that depends on the speed you want out of it. If you don't need any speed higher than what the Sabvoton's limit will give it, it would work.

Otherwise, you'll need something beyond that limit.

(sorry I don't know what the actual limit is on the sabvoton or others, but there is some discussion about that in a recent review thread for powervelocity controllers).

Thank you,

you are right.
50000 is actually conservative for my use as with the phaserunner @ 14S I get 60km/h and the wheel circumference is roughly 2 meters (60000mhour/2m/60min*80poles=~40000erpm). I don't plan going faster anyway.
Problem is that I can't find the sabvoton limit on any documentation except a message somewhere on the forum but I lost it...

I might have missed the information in an obvious place though.

Ok I tried to read as much posts as possible on these controllers.

Couldn't find this information on kathy's posts, just found a reference to erpm here: https://endless-sphere.com/forums/viewtopic.php?f=4&t=62240&hilit=sabvoton&start=50#p944624.

However it's a 2014 post talking about the first design of controllers (SVM, not SSC) if I am correct...
I sent a direct email to sabvoton to get more information.

Will keep you updated

Update: no news from sabvoton yet but found this document (from qsmotor) apparently referring to SSC controllers and stating 30000erpm...
Not sure how reliable it is though.

http://www.cnqsmotor.com/upfile/2016/04/20160427204822_414.pdf

30000erpm is ~45kmh max... BTW when the limiting factor for speed is not voltage but controller's erpm can field weakening still be effective ?