keyne
100 W
What's the smallest diameter DIRECT-DRIVE motor? Is there anything smaller than the crystalyte 400 series?
What's the smallest diameter direct drive motor?
- Thread starter keyne
- Start date
ElectricEd
100 W
IMHO don't go for a smaller diameter than a Crystalyte 4 motor because:
1/ Smaller diameter means more torque required wich means a greater current drawn from battery unless it has really trick magnets.
2/ There's a trade-off in size. The 4 series uses reare earth Neodymium magnets which are (I assume) are the strongest commercially available that make economic sense. To get a greater field strength required for a smaller diameter motor to be effective, you would need unobtainium magnets. :wink:
3/ Going by my experience with a 4 series motor, you'd be dissapointed with the performance with a smaller diameter. I have a few steep hills on my commute going home and have to get out of the saddle and help the motor with quite a bit of grunt to get over them. A smaller diameter would be worse.
If your reason for going smaller is to be discrete, so far it's only been the tech-savvy observers that have asked me "is that a motor in your rear hub?" More generally it's been "how did you get up that hill so easily?"
1/ Smaller diameter means more torque required wich means a greater current drawn from battery unless it has really trick magnets.
2/ There's a trade-off in size. The 4 series uses reare earth Neodymium magnets which are (I assume) are the strongest commercially available that make economic sense. To get a greater field strength required for a smaller diameter motor to be effective, you would need unobtainium magnets. :wink:
3/ Going by my experience with a 4 series motor, you'd be dissapointed with the performance with a smaller diameter. I have a few steep hills on my commute going home and have to get out of the saddle and help the motor with quite a bit of grunt to get over them. A smaller diameter would be worse.
If your reason for going smaller is to be discrete, so far it's only been the tech-savvy observers that have asked me "is that a motor in your rear hub?" More generally it's been "how did you get up that hill so easily?"
dogman dan
1 PW
Small diameter is usually geared. If you are wanting regen, Fusin is experimenting with gearmotors that don't freewheel for regen braking. I'll be testing one soon, I have the motor, but am waiting on the controller. ES member louispower is the guy to contact for one.
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