John and Cecil
10 kW
- Joined
- Mar 14, 2018
- Messages
- 529
Yes, abrupt changes are not good for stress on the motor and damage to the nylon gear. Getting the wheel stuck in the mud is another. This is exactly why I am preaching that these motors NEED to be power restricted at lower rpms.
Example #1 - I allow a neighbor to ride my ebike. He is clamped on the throttle doing 15mph, then suddenly he decides to stop for the ice cream man and he does not let go of the throttle. As the bike slows the motor will still be maxed out and pushing 16 amps. From down the street I watch smoke start pouring out of my motor and I wave bye bye to my blue gear, or worse my controller and or motor. I go online and I order new parts.
Example number 2 - same as #1 but my motor is power restricted to (i will use cadence numbers but the motor should be power restricted according to engine rpm and not cadence rpm due to the throttle) 0-10rpm 50w, 10-20 150w, 20-30 250w, 30-40 350w, 40-50 450w, 50-60 550w, 60-70 650, 70+ 750w. This time when the moron hits the brakes as the rpms reduce so does the power, and when he comes to a stop motor output is negligible. I run up to him and push him off my bike, then ride it home and thank the heavens I reprogrammed the motor output.
These examples would be the same for getting stuck in mud, trying to climb a hill to steep, crashing and getting the wheel stuck or locked up, etc, etc. The trade off is you would have to pedal initially to get up to 50 cadence before you get into the meat of the power, but that is just for takeoffs under say 5 mph.
Example #1 - I allow a neighbor to ride my ebike. He is clamped on the throttle doing 15mph, then suddenly he decides to stop for the ice cream man and he does not let go of the throttle. As the bike slows the motor will still be maxed out and pushing 16 amps. From down the street I watch smoke start pouring out of my motor and I wave bye bye to my blue gear, or worse my controller and or motor. I go online and I order new parts.
Example number 2 - same as #1 but my motor is power restricted to (i will use cadence numbers but the motor should be power restricted according to engine rpm and not cadence rpm due to the throttle) 0-10rpm 50w, 10-20 150w, 20-30 250w, 30-40 350w, 40-50 450w, 50-60 550w, 60-70 650, 70+ 750w. This time when the moron hits the brakes as the rpms reduce so does the power, and when he comes to a stop motor output is negligible. I run up to him and push him off my bike, then ride it home and thank the heavens I reprogrammed the motor output.
These examples would be the same for getting stuck in mud, trying to climb a hill to steep, crashing and getting the wheel stuck or locked up, etc, etc. The trade off is you would have to pedal initially to get up to 50 cadence before you get into the meat of the power, but that is just for takeoffs under say 5 mph.