steelefist
1 W
- Joined
- May 27, 2008
- Messages
- 62
Hello,
I am in the last stages now of finishing a cyclone mid drive conversion. I have previously built an electric scooter and electric quad bike (6000w peak power) but I wanted something that was less conspicuous to ride around on.
I'm using a diamondback outback front suspension mountainbike frame with a 3000w cyclone kit. I was looking, originally, at building the drive using an RC motor. I have a HXT 170kv motor from a previous project, so I was going to couple this with a castle creations controller, BEC, etc. But the gearing down just seems to be nuisance. Worm drives, multiple sprocket reductions, expensive planetarys, belt reductions all seem to have drawbacks. I was looking at using a planetary from a torque wrench, but decided to just go for a cyclone set up and modify that where necessary.
I've already mounted the cyclone kit to the bike. I just need to mount the battery box into the frame triangle next. I'm using the 22.2V 5000mAh Lipos from my quad. To begin with, the system will be 12S,5Ah. If all looks good then this will go to 18S, 10Ah. If all that goes well then i'll go for some of the 9S packs from hobbyking, as they look pretty compact.
I have a question about the motor. Cyclone quote 90Nm for maximum torque? Does anybody with experience of these BLDC motors know how accurate this is? The reduction to the crank is 7:48 (approx 1:7). This puts peak torque at the crank at approx 620Nm. Max RPM will be about 850 at the crank. An Audi R8 V10 engine has a max torque of 540Nm.
Seems like a lot of torque for a relatively small motor.
BTW, the bike looks awesome. I'll put some pics up.
I am in the last stages now of finishing a cyclone mid drive conversion. I have previously built an electric scooter and electric quad bike (6000w peak power) but I wanted something that was less conspicuous to ride around on.
I'm using a diamondback outback front suspension mountainbike frame with a 3000w cyclone kit. I was looking, originally, at building the drive using an RC motor. I have a HXT 170kv motor from a previous project, so I was going to couple this with a castle creations controller, BEC, etc. But the gearing down just seems to be nuisance. Worm drives, multiple sprocket reductions, expensive planetarys, belt reductions all seem to have drawbacks. I was looking at using a planetary from a torque wrench, but decided to just go for a cyclone set up and modify that where necessary.
I've already mounted the cyclone kit to the bike. I just need to mount the battery box into the frame triangle next. I'm using the 22.2V 5000mAh Lipos from my quad. To begin with, the system will be 12S,5Ah. If all looks good then this will go to 18S, 10Ah. If all that goes well then i'll go for some of the 9S packs from hobbyking, as they look pretty compact.
I have a question about the motor. Cyclone quote 90Nm for maximum torque? Does anybody with experience of these BLDC motors know how accurate this is? The reduction to the crank is 7:48 (approx 1:7). This puts peak torque at the crank at approx 620Nm. Max RPM will be about 850 at the crank. An Audi R8 V10 engine has a max torque of 540Nm.
Seems like a lot of torque for a relatively small motor.
BTW, the bike looks awesome. I'll put some pics up.