Hey everyone, I've built my first ebike recently from some new and used parts. Long story short is that the speed values I see in CA3 display does not correlate with the reality regardless of what number of poles / wheel circumference I put in.
Now a bit more details:
Motor: I have a bafang G.020.350.D 10 front hub motor which I got used from the bike shop which disassembled a lot of wrongly laced wheel sets and the seller told me that the motor works like new.
Controller: new baserunner z9 from grin
CA: CA3-WP
Battery: EM3EV 14s9p 27ah
1. I have configured the baserunner with autotune by setting Number of pole pairs to 10 (website shows number of poles 20 which i divided by two). I wonder if anyone can confirm that this is the right way to go.
2. I have set the wheel diameter is baserunner to 4 inches: my wheel is 20 inches and reduction ratio of this motor is 1:5.
After these two steps the max unloaded speed showing in the baserunner suite dashboard is ~41kph and max rpm is ~2100. 2100 looks way too much for me, isn't it? its like >30 rotations per second... and the link above shows lower rpm as of ~300.
Now we are getting to the CA3 part:
3. I have set the number of poles in the CA3 speedometer setup to 20 (as I understood here it means the actual number of magnets inside which is 20 given the link above), and the wheel circumference to 303mm (1515mm / 5) since my 20inch wheel is ~1515mm. After this I see the speed goes only up to ~8kmh but wheel is rotating MUCH faster than that. I have tried to change number of poles to 10 and then speed weirdly fluctuates as it can go up to 12 and then instantly show smth like 4 or so.
That's it. Basically the bike itself works really well as I've successfully set up closed loop power throttle and throttle ranges. But I really want this speed thing to be working well so I can enjoy the numbers while climbing uphill.
It feels like I may have (1) issues with the baserunner motor setup (autotune with 10 pole pairs not sure if thats correct value) and (2) the discrepancy between the baserunner and the cycle analyst settings.
Please help me! thanks
attaching the pic of my new ebike for daily commute!
Now a bit more details:
Motor: I have a bafang G.020.350.D 10 front hub motor which I got used from the bike shop which disassembled a lot of wrongly laced wheel sets and the seller told me that the motor works like new.
Controller: new baserunner z9 from grin
CA: CA3-WP
Battery: EM3EV 14s9p 27ah
1. I have configured the baserunner with autotune by setting Number of pole pairs to 10 (website shows number of poles 20 which i divided by two). I wonder if anyone can confirm that this is the right way to go.
2. I have set the wheel diameter is baserunner to 4 inches: my wheel is 20 inches and reduction ratio of this motor is 1:5.
After these two steps the max unloaded speed showing in the baserunner suite dashboard is ~41kph and max rpm is ~2100. 2100 looks way too much for me, isn't it? its like >30 rotations per second... and the link above shows lower rpm as of ~300.
Now we are getting to the CA3 part:
3. I have set the number of poles in the CA3 speedometer setup to 20 (as I understood here it means the actual number of magnets inside which is 20 given the link above), and the wheel circumference to 303mm (1515mm / 5) since my 20inch wheel is ~1515mm. After this I see the speed goes only up to ~8kmh but wheel is rotating MUCH faster than that. I have tried to change number of poles to 10 and then speed weirdly fluctuates as it can go up to 12 and then instantly show smth like 4 or so.
That's it. Basically the bike itself works really well as I've successfully set up closed loop power throttle and throttle ranges. But I really want this speed thing to be working well so I can enjoy the numbers while climbing uphill.
It feels like I may have (1) issues with the baserunner motor setup (autotune with 10 pole pairs not sure if thats correct value) and (2) the discrepancy between the baserunner and the cycle analyst settings.
Please help me! thanks
attaching the pic of my new ebike for daily commute!