About 20 months ago I fitted one of my bikes with a Yose Power 250w. rear cassette hub kit. Not satisfied with the rather crude operation from the YJT 15A controller, I fitted a Lishui 18A controller that Yose supply with their 350w kits, which was a big improvement. However, I have been reading saneagle and Nealh extolling the virtues of KT "torque simulation" (or current control) for some time, and with one eye on going up to 48v at some point, I just had to give it a try. I've bought and fitted a KT 20A controller (PSWPower) and a KT-LCD3 display and 4-in 1 cable (TopBikeKit).
I've spent some time learning all the settings - and here I have to thank Slightlypedantic (of this parish) for doing the donkey work in determining the correct parameters for the Yose AKM95RX motor. It is a low geared, high torque model and his calculation of P1=163 was near enough spot-on when I compared speed to a GPS computer. With the controller set to 17A (same as I had set the Lishui) I did a 6 mile test ride this morning.
First impressions? It's bloody awesome! The motor runs even more smoothly and quietly than before and I was able to use mostly PAS 1 (previously near useless) and PAS 2.
Not having these cutting off at a set speed makes it all feel more "natural". I could almost kid myself that I was doing all the work and there wasn't a motor there at all.
There's a long steep-ish hill locally and I decided to see what PAS 5 would do. I'd set the speed limit to 18mph beforehand , and hit the foot of the climb at 10mph. Whacking it into PAS 5, the bike accelerated rapidly to the speed limit with hardly any effort from me and held it to the top. Watts were around 600 and the motor and controller were stone cold. With this level of performance I'm starting to think that 48v won't be necessary - but might still be tempted.
There is one annoying feature that I've not got to the bottom of yet. The "walk assist" is far too fierce. The torque is such that it almost does a "wheelie" on starting, and I have to run to keep up - or pull back hard on the bars to stop it running away. I did wonder if this is down to the motor, but walk assist was fine with the Lishui controller. Conversely, the throttle when set at 6km/h max is very weak and doesn't give the "nudge" that I was used to. I tried changing the undocumented C15 which seems to change the 6km/h limit ( range 4-6) and although it does change the speed, the torque is just as high on any of the settings. I'd welcome anyone's thoughts on this as other wise it's so good I'm thinking of changing the controllers on my other two bikes (Yose 350w) as well when funds permit. In retrospect, I wonder if the walk assist torque is dependant on the PAS level that's selected at the time? I'll give that a try next.
I've spent some time learning all the settings - and here I have to thank Slightlypedantic (of this parish) for doing the donkey work in determining the correct parameters for the Yose AKM95RX motor. It is a low geared, high torque model and his calculation of P1=163 was near enough spot-on when I compared speed to a GPS computer. With the controller set to 17A (same as I had set the Lishui) I did a 6 mile test ride this morning.
First impressions? It's bloody awesome! The motor runs even more smoothly and quietly than before and I was able to use mostly PAS 1 (previously near useless) and PAS 2.
Not having these cutting off at a set speed makes it all feel more "natural". I could almost kid myself that I was doing all the work and there wasn't a motor there at all.
There's a long steep-ish hill locally and I decided to see what PAS 5 would do. I'd set the speed limit to 18mph beforehand , and hit the foot of the climb at 10mph. Whacking it into PAS 5, the bike accelerated rapidly to the speed limit with hardly any effort from me and held it to the top. Watts were around 600 and the motor and controller were stone cold. With this level of performance I'm starting to think that 48v won't be necessary - but might still be tempted.
There is one annoying feature that I've not got to the bottom of yet. The "walk assist" is far too fierce. The torque is such that it almost does a "wheelie" on starting, and I have to run to keep up - or pull back hard on the bars to stop it running away. I did wonder if this is down to the motor, but walk assist was fine with the Lishui controller. Conversely, the throttle when set at 6km/h max is very weak and doesn't give the "nudge" that I was used to. I tried changing the undocumented C15 which seems to change the 6km/h limit ( range 4-6) and although it does change the speed, the torque is just as high on any of the settings. I'd welcome anyone's thoughts on this as other wise it's so good I'm thinking of changing the controllers on my other two bikes (Yose 350w) as well when funds permit. In retrospect, I wonder if the walk assist torque is dependant on the PAS level that's selected at the time? I'll give that a try next.
