E-HP said:Given variability of motors between brands or models, calculating the winding would likely be very complex. You could use the inversely proportional relationship between motor winding and motor Kv to calculate one or the other for motor, if you have a known motor of the same type, with a known winding and Kv. So if you know the Kv and winding of motor X, and you have the Kv of motor Y, you can figure out the winding for motor Y.
The slow vs fast winding concept is relative -- you have to have two motors to compare.gobi said:Though I understand the slow vs fast winding in a hub motor concept, how do I go about calculating/determining that in a motor?
fatty said:The slow vs fast winding concept is relative -- you have to have two motors to compare.gobi said:Though I understand the slow vs fast winding in a hub motor concept, how do I go about calculating/determining that in a motor?
If they only sell one option, then.. well, you get what you get.
But he already (almost) calculated (approximate) Kv:Chalo said:Ultimately, it's a given RPM per volt you want, and winding is incidental to that.
I guess I should asked: to what end?gobi said:How do I go about measuring the RPM of the hub? does it output it?
The Yescom does not come with a lcd display just a throttle with led indicator for batt and on/off switch.
gobi said:6 rpm/V (thanks!)
so what does mean? slow? fast?
spinningmagnets said:in the "non-hub" section, the thread stickie list has a link to a chart that spells out two formulas for calculating wheel-diameter to road-speed,
spinningmagnets said:in the "non-hub" section, the thread stickie list has a link to a chart that spells out two formulas for calculating wheel-diameter to road-speed, and then simply lists a couple pages worth of RPM/ road-speeds for 20, 22, 24, 26, 29-inch wheels.
Once you know the tire-OD and the top-speed you want, that link tells you the wheel RPMs you need for designing a non-hub system
At 36 volts nominal, in a 24 inch wheel, the unloaded speed will be around 16 mph. The most efficient cruising speed will be about 12-13 mph. These are appropriate numbers for an upright trike, if that's your application. It would also be good for moving around a job site or a pedestrian area. Many bikes would feel frustratingly slow on the street at such speeds. For those, it would be better to use a higher voltage.
If you use a 48 volt battery with that motor, the free speed would be around 21 mph and the most efficient cruising speed around 17 mph. With a 52 volt battery, the free speed would be around 23 mph and the most efficient cruising speed about 18.5 mph.